blender-archive/source/blender/editors/interface/interface_handlers.c

/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * The Original Code is Copyright (C) 2008 Blender Foundation.
 * All rights reserved.
 *
 * Contributor(s): Blender Foundation
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file blender/editors/interface/interface_handlers.c
 *  \ingroup edinterface
 */

#include <float.h>
#include <limits.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <assert.h>

#include "MEM_guardedalloc.h"

#include "DNA_brush_types.h"

#include "DNA_scene_types.h"
#include "DNA_screen_types.h"

#include "BLI_math.h"
#include "BLI_listbase.h"
#include "BLI_linklist.h"
#include "BLI_string.h"
#include "BLI_string_utf8.h"
#include "BLI_string_cursor_utf8.h"
#include "BLI_rect.h"
#include "BLI_utildefines.h"

#include "PIL_time.h"

#include "BKE_colorband.h"
#include "BKE_blender_undo.h"
#include "BKE_brush.h"
#include "BKE_colortools.h"
#include "BKE_context.h"
#include "BKE_report.h"
#include "BKE_screen.h"
#include "BKE_tracking.h"
#include "BKE_unit.h"
#include "BKE_paint.h"

#include "IMB_colormanagement.h"

#include "ED_screen.h"
#include "ED_undo.h"

#include "UI_interface.h"
#include "UI_view2d.h"

#include "BLF_api.h"

#include "interface_intern.h"

#include "RNA_access.h"

#include "WM_api.h"
#include "WM_types.h"
#include "wm_event_system.h"

#ifdef WITH_INPUT_IME
#  include "wm_window.h"
#  include "BLT_translation.h"
#  include "BLT_lang.h"
#endif

/* place the mouse at the scaled down location when un-grabbing */
#define USE_CONT_MOUSE_CORRECT
/* support dragging toggle buttons */
#define USE_DRAG_TOGGLE

/* support dragging multiple number buttons at once */
#define USE_DRAG_MULTINUM

/* allow dragging/editing all other selected items at once */
#define USE_ALLSELECT

/* so we can avoid very small mouse-moves from jumping away from keyboard navigation [#34936] */
#define USE_KEYNAV_LIMIT

/* drag popups by their header */
#define USE_DRAG_POPUP

#define UI_MAX_PASSWORD_STR 128

/* proto */
static int ui_do_but_EXIT(bContext *C, uiBut *but, struct uiHandleButtonData *data, const wmEvent *event);
static bool ui_but_find_select_in_enum__cmp(const uiBut *but_a, const uiBut *but_b);
static void ui_textedit_string_set(uiBut *but, struct uiHandleButtonData *data, const char *str);

#ifdef USE_KEYNAV_LIMIT
static void ui_mouse_motion_keynav_init(struct uiKeyNavLock *keynav, const wmEvent *event);
static bool ui_mouse_motion_keynav_test(struct uiKeyNavLock *keynav, const wmEvent *event);
#endif

/***************** structs and defines ****************/

#define BUTTON_FLASH_DELAY          0.020
#define MENU_SCROLL_INTERVAL        0.1
#define PIE_MENU_INTERVAL           0.01
#define BUTTON_AUTO_OPEN_THRESH     0.2
#define BUTTON_MOUSE_TOWARDS_THRESH 1.0
/* pixels to move the cursor to get out of keyboard navigation */
#define BUTTON_KEYNAV_PX_LIMIT      8

#define MENU_TOWARDS_MARGIN 20  /* margin in pixels */
#define MENU_TOWARDS_WIGGLE_ROOM 64  /* tolerance in pixels */
/* drag-lock distance threshold in pixels */
#define BUTTON_DRAGLOCK_THRESH      3

typedef enum uiButtonActivateType {
	BUTTON_ACTIVATE_OVER,
	BUTTON_ACTIVATE,
	BUTTON_ACTIVATE_APPLY,
	BUTTON_ACTIVATE_TEXT_EDITING,
	BUTTON_ACTIVATE_OPEN
} uiButtonActivateType;

typedef enum uiHandleButtonState {
	BUTTON_STATE_INIT,
	BUTTON_STATE_HIGHLIGHT,
	BUTTON_STATE_WAIT_FLASH,
	BUTTON_STATE_WAIT_RELEASE,
	BUTTON_STATE_WAIT_KEY_EVENT,
	BUTTON_STATE_NUM_EDITING,
	BUTTON_STATE_TEXT_EDITING,
	BUTTON_STATE_TEXT_SELECTING,
	BUTTON_STATE_MENU_OPEN,
	BUTTON_STATE_WAIT_DRAG,
	BUTTON_STATE_EXIT
} uiHandleButtonState;


#ifdef USE_ALLSELECT

/* Unfortunately there's no good way handle more generally:
 * (propagate single clicks on layer buttons to other objects) */
#define USE_ALLSELECT_LAYER_HACK

typedef struct uiSelectContextElem {
	PointerRNA ptr;
	union {
		bool  val_b;
		int   val_i;
		float val_f;
	};
} uiSelectContextElem;

typedef struct uiSelectContextStore {
	uiSelectContextElem *elems;
	int elems_len;
	bool do_free;
	bool is_enabled;
	/* When set, simply copy values (don't apply difference).
	 * Rules are:
	 * - dragging numbers uses delta.
	 * - typing in values will assign to all. */
	bool is_copy;
} uiSelectContextStore;

static bool ui_selectcontext_begin(
        bContext *C, uiBut *but, struct uiSelectContextStore *selctx_data);
static void ui_selectcontext_end(
        uiBut *but, uiSelectContextStore *selctx_data);
static void ui_selectcontext_apply(
        bContext *C, uiBut *but, struct uiSelectContextStore *selctx_data,
        const double value, const double value_orig);

#define IS_ALLSELECT_EVENT(event) ((event)->alt != 0)

/** just show a tinted color so users know its activated */
#define UI_BUT_IS_SELECT_CONTEXT UI_BUT_NODE_ACTIVE

#endif  /* USE_ALLSELECT */


#ifdef USE_DRAG_MULTINUM

/**
 * how far to drag before we check for gesture direction (in pixels),
 * note: half the height of a button is about right... */
#define DRAG_MULTINUM_THRESHOLD_DRAG_X (UI_UNIT_Y / 4)

/**
 * how far to drag horizontally before we stop checking which buttons the gesture spans (in pixels),
 * locking down the buttons so we can drag freely without worrying about vertical movement. */
#define DRAG_MULTINUM_THRESHOLD_DRAG_Y (UI_UNIT_Y / 4)

/**
 * how strict to be when detecting a vertical gesture, [0.5 == sloppy], [0.9 == strict], (unsigned dot-product)
 * note: we should be quite strict here, since doing a vertical gesture by accident should be avoided,
 * however with some care a user should be able to do a vertical movement without *missing*. */
#define DRAG_MULTINUM_THRESHOLD_VERTICAL (0.75f)


/* a simple version of uiHandleButtonData when accessing multiple buttons */
typedef struct uiButMultiState {
	double origvalue;
	uiBut *but;

#ifdef USE_ALLSELECT
	uiSelectContextStore select_others;
#endif
} uiButMultiState;

typedef struct uiHandleButtonMulti {
	enum {
		BUTTON_MULTI_INIT_UNSET = 0,    /* gesture direction unknown, wait until mouse has moved enough... */
		BUTTON_MULTI_INIT_SETUP,        /* vertical gesture detected, flag buttons interactively (UI_BUT_DRAG_MULTI) */
		BUTTON_MULTI_INIT_ENABLE,       /* flag buttons finished, apply horizontal motion to active and flagged */
		BUTTON_MULTI_INIT_DISABLE,      /* vertical gesture _not_ detected, take no further action */
	} init;

	bool has_mbuts;  /* any buttons flagged UI_BUT_DRAG_MULTI */
	LinkNode *mbuts;
	uiButStore *bs_mbuts;

	bool is_proportional;

	/* In some cases we directly apply the changes to multiple buttons, so we don't want to do it twice. */
	bool skip;

	/* before activating, we need to check gesture direction
	 * accumulate signed cursor movement here so we can tell if this is a vertical motion or not. */
	float drag_dir[2];

	/* values copied direct from event->x,y
	 * used to detect buttons between the current and initial mouse position */
	int drag_start[2];

	/* store x location once BUTTON_MULTI_INIT_SETUP is set,
	 * moving outside this sets BUTTON_MULTI_INIT_ENABLE */
	int drag_lock_x;

} uiHandleButtonMulti;

#endif  /* USE_DRAG_MULTINUM */

typedef struct uiHandleButtonData {
	wmWindowManager *wm;
	wmWindow *window;
	ARegion *region;

	bool interactive;

	/* overall state */
	uiHandleButtonState state;
	int retval;
	/* booleans (could be made into flags) */
	bool cancel, escapecancel;
	bool applied, applied_interactive;
	bool changed_cursor;
	wmTimer *flashtimer;

	/* edited value */
	/* use 'ui_textedit_string_set' to assign new strings */
	char *str;
	char *origstr;
	double value, origvalue, startvalue;
	float vec[3], origvec[3];
#if 0  /* UNUSED */
	int togdual, togonly;
#endif
	ColorBand *coba;

	/* tooltip */
	unsigned int tooltip_force : 1;

	/* auto open */
	bool used_mouse;
	wmTimer *autoopentimer;

	/* auto open (hold) */
	wmTimer *hold_action_timer;

	/* text selection/editing */
	/* size of 'str' (including terminator) */
	int maxlen;
	/* Button text selection:
	 * extension direction, selextend, inside ui_do_but_TEX */
	enum {
		EXTEND_NONE =     0,
		EXTEND_LEFT =     1,
		EXTEND_RIGHT =    2,
	} selextend;
	float selstartx;
	/* allow to realloc str/editstr and use 'maxlen' to track alloc size (maxlen + 1) */
	bool is_str_dynamic;

	/* number editing / dragging */
	/* coords are Window/uiBlock relative (depends on the button) */
	int draglastx, draglasty;
	int dragstartx, dragstarty;
	int draglastvalue;
	int dragstartvalue;
	bool dragchange, draglock;
	int dragsel;
	float dragf, dragfstart;
	CBData *dragcbd;

#ifdef USE_CONT_MOUSE_CORRECT
	/* when ungrabbing buttons which are #ui_but_is_cursor_warp(), we may want to position them
	 * FLT_MAX signifies do-nothing, use #ui_block_to_window_fl() to get this into a usable space  */
	float ungrab_mval[2];
#endif

	/* menu open (watch UI_screen_free_active_but) */
	uiPopupBlockHandle *menu;
	int menuretval;

	/* search box (watch UI_screen_free_active_but) */
	ARegion *searchbox;
#ifdef USE_KEYNAV_LIMIT
	struct uiKeyNavLock searchbox_keynav_state;
#endif

#ifdef USE_DRAG_MULTINUM
	/* Multi-buttons will be updated in unison with the active button. */
	uiHandleButtonMulti multi_data;
#endif

#ifdef USE_ALLSELECT
	uiSelectContextStore select_others;
#endif

	/* post activate */
	uiButtonActivateType posttype;
	uiBut *postbut;
} uiHandleButtonData;

typedef struct uiAfterFunc {
	struct uiAfterFunc *next, *prev;

	uiButHandleFunc func;
	void *func_arg1;
	void *func_arg2;

	uiButHandleNFunc funcN;
	void *func_argN;

	uiButHandleRenameFunc rename_func;
	void *rename_arg1;
	void *rename_orig;

	uiBlockHandleFunc handle_func;
	void *handle_func_arg;
	int retval;

	uiMenuHandleFunc butm_func;
	void *butm_func_arg;
	int a2;

	wmOperator *popup_op;
	wmOperatorType *optype;
	int opcontext;
	PointerRNA *opptr;

	PointerRNA rnapoin;
	PropertyRNA *rnaprop;

	bContextStore *context;

	char undostr[BKE_UNDO_STR_MAX];
} uiAfterFunc;



static bool ui_but_is_interactive(const uiBut *but, const bool labeledit);
static bool ui_but_contains_pt(uiBut *but, float mx, float my);
static bool ui_but_contains_point_px(ARegion *ar, uiBut *but, int x, int y);
static uiBut *ui_but_find_mouse_over_ex(ARegion *ar, const int x, const int y, const bool labeledit);
static void button_activate_init(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type);
static void button_activate_state(bContext *C, uiBut *but, uiHandleButtonState state);
static void button_activate_exit(
        bContext *C, uiBut *but, uiHandleButtonData *data,
        const bool mousemove, const bool onfree);
static int ui_handler_region_menu(bContext *C, const wmEvent *event, void *userdata);
static void ui_handle_button_activate(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type);

#ifdef USE_DRAG_MULTINUM
static void ui_multibut_restore(bContext *C, uiHandleButtonData *data, uiBlock *block);
static uiButMultiState *ui_multibut_lookup(uiHandleButtonData *data, const uiBut *but);
#endif

/* buttons clipboard */
static ColorBand but_copypaste_coba = {0};
static CurveMapping but_copypaste_curve = {0};
static bool but_copypaste_curve_alive = false;

/* ******************** menu navigation helpers ************** */
enum eSnapType {
	SNAP_OFF = 0,
	SNAP_ON,
	SNAP_ON_SMALL,
};

static enum eSnapType ui_event_to_snap(const wmEvent *event)
{
	return (event->ctrl) ? (event->shift) ? SNAP_ON_SMALL : SNAP_ON : SNAP_OFF;
}

static bool ui_event_is_snap(const wmEvent *event)
{
	return (ELEM(event->type, LEFTCTRLKEY, RIGHTCTRLKEY) ||
	        ELEM(event->type, LEFTSHIFTKEY, RIGHTSHIFTKEY));
}

static void ui_color_snap_hue(const enum eSnapType snap, float *r_hue)
{
	const float snap_increment = (snap == SNAP_ON_SMALL) ? 24 : 12;
	BLI_assert(snap != SNAP_OFF);
	*r_hue = roundf((*r_hue) * snap_increment) / snap_increment;
}

/* assumes event type is MOUSEPAN */
void ui_pan_to_scroll(const wmEvent *event, int *type, int *val)
{
	static int lastdy = 0;
	int dy = event->prevy - event->y;

	/* This event should be originally from event->type,
	 * converting wrong event into wheel is bad, see [#33803] */
	BLI_assert(*type == MOUSEPAN);

	/* sign differs, reset */
	if ((dy > 0 && lastdy < 0) || (dy < 0 && lastdy > 0)) {
		lastdy = dy;
	}
	else {
		lastdy += dy;

		if (ABS(lastdy) > (int)UI_UNIT_Y) {
			if (U.uiflag2 & USER_TRACKPAD_NATURAL)
				dy = -dy;

			*val = KM_PRESS;

			if (dy > 0)
				*type = WHEELUPMOUSE;
			else
				*type = WHEELDOWNMOUSE;

			lastdy = 0;
		}
	}
}

static uiBut *ui_but_prev(uiBut *but)
{
	while (but->prev) {
		but = but->prev;
		if (ui_but_is_editable(but)) return but;
	}
	return NULL;
}

static uiBut *ui_but_next(uiBut *but)
{
	while (but->next) {
		but = but->next;
		if (ui_but_is_editable(but)) return but;
	}
	return NULL;
}

static uiBut *ui_but_first(uiBlock *block)
{
	uiBut *but;

	but = block->buttons.first;
	while (but) {
		if (ui_but_is_editable(but)) return but;
		but = but->next;
	}
	return NULL;
}

static uiBut *ui_but_last(uiBlock *block)
{
	uiBut *but;

	but = block->buttons.last;
	while (but) {
		if (ui_but_is_editable(but)) return but;
		but = but->prev;
	}
	return NULL;
}

static bool ui_but_is_cursor_warp(uiBut *but)
{
	if (U.uiflag & USER_CONTINUOUS_MOUSE) {
		if (ELEM(but->type,
		         UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER, UI_BTYPE_HSVCIRCLE,
		         UI_BTYPE_TRACK_PREVIEW, UI_BTYPE_HSVCUBE, UI_BTYPE_CURVE))
		{
			return true;
		}
	}

	return false;
}

/**
 * Ignore mouse movements within some horizontal pixel threshold before starting to drag
 */
static bool ui_but_dragedit_update_mval(uiHandleButtonData *data, int mx)
{
	if (mx == data->draglastx)
		return false;

	if (data->draglock) {
		if (ABS(mx - data->dragstartx) <= BUTTON_DRAGLOCK_THRESH) {
			return false;
		}
#ifdef USE_DRAG_MULTINUM
		if (ELEM(data->multi_data.init, BUTTON_MULTI_INIT_UNSET, BUTTON_MULTI_INIT_SETUP)) {
			return false;
		}
#endif
		data->draglock = false;
		data->dragstartx = mx;  /* ignore mouse movement within drag-lock */
	}

	return true;
}

static float ui_mouse_scale_warp_factor(const bool shift)
{
	return shift ? 0.05f : 1.0f;
}

static void ui_mouse_scale_warp(
        uiHandleButtonData *data, const float mx, const float my,
        float *r_mx, float *r_my, const bool shift)
{
	const float fac = ui_mouse_scale_warp_factor(shift);

	/* slow down the mouse, this is fairly picky */
	*r_mx = (data->dragstartx * (1.0f - fac) + mx * fac);
	*r_my = (data->dragstarty * (1.0f - fac) + my * fac);
}

/* file selectors are exempt from utf-8 checks */
bool ui_but_is_utf8(const uiBut *but)
{
	if (but->rnaprop) {
		const int subtype = RNA_property_subtype(but->rnaprop);
		return !(ELEM(subtype, PROP_FILEPATH, PROP_DIRPATH, PROP_FILENAME, PROP_BYTESTRING));
	}
	else {
		return !(but->flag & UI_BUT_NO_UTF8);
	}
}

/* ********************** button apply/revert ************************/

static ListBase UIAfterFuncs = {NULL, NULL};

static uiAfterFunc *ui_afterfunc_new(void)
{
	uiAfterFunc *after;

	after = MEM_callocN(sizeof(uiAfterFunc), "uiAfterFunc");

	BLI_addtail(&UIAfterFuncs, after);

	return after;
}

/**
 * For executing operators after the button is pressed.
 * (some non operator buttons need to trigger operators), see: [#37795]
 *
 * \note Can only call while handling buttons.
 */
PointerRNA *ui_handle_afterfunc_add_operator(wmOperatorType *ot, int opcontext, bool create_props)
{
	PointerRNA *ptr = NULL;
	uiAfterFunc *after = ui_afterfunc_new();

	after->optype = ot;
	after->opcontext = opcontext;

	if (create_props) {
		ptr = MEM_callocN(sizeof(PointerRNA), __func__);
		WM_operator_properties_create_ptr(ptr, ot);
		after->opptr = ptr;
	}

	return ptr;
}

static void popup_check(bContext *C, wmOperator *op)
{
	if (op && op->type->check) {
		op->type->check(C, op);
	}
}

/**
 * Check if a #uiAfterFunc is needed for this button.
 */
static bool ui_afterfunc_check(const uiBlock *block, const uiBut *but)
{
	return (but->func || but->funcN || but->rename_func || but->optype || but->rnaprop || block->handle_func ||
	        (but->type == UI_BTYPE_BUT_MENU && block->butm_func) ||
	        (block->handle && block->handle->popup_op));
}

static void ui_apply_but_func(bContext *C, uiBut *but)
{
	uiAfterFunc *after;
	uiBlock *block = but->block;

	/* these functions are postponed and only executed after all other
	 * handling is done, i.e. menus are closed, in order to avoid conflicts
	 * with these functions removing the buttons we are working with */

	if (ui_afterfunc_check(block, but)) {
		after = ui_afterfunc_new();

		if (but->func && ELEM(but, but->func_arg1, but->func_arg2)) {
			/* exception, this will crash due to removed button otherwise */
			but->func(C, but->func_arg1, but->func_arg2);
		}
		else
			after->func = but->func;

		after->func_arg1 = but->func_arg1;
		after->func_arg2 = but->func_arg2;

		after->funcN = but->funcN;
		after->func_argN = (but->func_argN) ? MEM_dupallocN(but->func_argN) : NULL;

		after->rename_func = but->rename_func;
		after->rename_arg1 = but->rename_arg1;
		after->rename_orig = but->rename_orig; /* needs free! */

		after->handle_func = block->handle_func;
		after->handle_func_arg = block->handle_func_arg;
		after->retval = but->retval;

		if (but->type == UI_BTYPE_BUT_MENU) {
			after->butm_func = block->butm_func;
			after->butm_func_arg = block->butm_func_arg;
			after->a2 = but->a2;
		}

		if (block->handle)
			after->popup_op = block->handle->popup_op;

		after->optype = but->optype;
		after->opcontext = but->opcontext;
		after->opptr = but->opptr;

		after->rnapoin = but->rnapoin;
		after->rnaprop = but->rnaprop;

		if (but->context)
			after->context = CTX_store_copy(but->context);

		but->optype = NULL;
		but->opcontext = 0;
		but->opptr = NULL;
	}
}

/* typically call ui_apply_but_undo(), ui_apply_but_autokey() */
static void ui_apply_but_undo(uiBut *but)
{
	uiAfterFunc *after;

	if (but->flag & UI_BUT_UNDO) {
		const char *str = NULL;

		/* define which string to use for undo */
		if (but->type == UI_BTYPE_MENU) str = but->drawstr;
		else if (but->drawstr[0]) str = but->drawstr;
		else str = but->tip;

		/* fallback, else we don't get an undo! */
		if (str == NULL || str[0] == '\0') {
			str = "Unknown Action";
		}

		/* delayed, after all other funcs run, popups are closed, etc */
		after = ui_afterfunc_new();
		BLI_strncpy(after->undostr, str, sizeof(after->undostr));
	}
}

static void ui_apply_but_autokey(bContext *C, uiBut *but)
{
	Scene *scene = CTX_data_scene(C);

	/* try autokey */
	ui_but_anim_autokey(C, but, scene, scene->r.cfra);

	/* make a little report about what we've done! */
	if (but->rnaprop) {
		char *buf;

		if (RNA_property_subtype(but->rnaprop) == PROP_PASSWORD) {
			return;
		}

		buf = WM_prop_pystring_assign(C, &but->rnapoin, but->rnaprop, but->rnaindex);
		if (buf) {
			BKE_report(CTX_wm_reports(C), RPT_PROPERTY, buf);
			MEM_freeN(buf);

			WM_event_add_notifier(C, NC_SPACE | ND_SPACE_INFO_REPORT, NULL);
		}
	}
}

static void ui_apply_but_funcs_after(bContext *C)
{
	uiAfterFunc *afterf, after;
	PointerRNA opptr;
	ListBase funcs;

	/* copy to avoid recursive calls */
	funcs = UIAfterFuncs;
	BLI_listbase_clear(&UIAfterFuncs);

	for (afterf = funcs.first; afterf; afterf = after.next) {
		after = *afterf; /* copy to avoid memleak on exit() */
		BLI_freelinkN(&funcs, afterf);

		if (after.context)
			CTX_store_set(C, after.context);

		if (after.popup_op)
			popup_check(C, after.popup_op);

		if (after.opptr) {
			/* free in advance to avoid leak on exit */
			opptr = *after.opptr;
			MEM_freeN(after.opptr);
		}

		if (after.optype)
			WM_operator_name_call_ptr(C, after.optype, after.opcontext, (after.opptr) ? &opptr : NULL);

		if (after.opptr)
			WM_operator_properties_free(&opptr);

		if (after.rnapoin.data)
			RNA_property_update(C, &after.rnapoin, after.rnaprop);

		if (after.context) {
			CTX_store_set(C, NULL);
			CTX_store_free(after.context);
		}

		if (after.func)
			after.func(C, after.func_arg1, after.func_arg2);
		if (after.funcN)
			after.funcN(C, after.func_argN, after.func_arg2);
		if (after.func_argN)
			MEM_freeN(after.func_argN);

		if (after.handle_func)
			after.handle_func(C, after.handle_func_arg, after.retval);
		if (after.butm_func)
			after.butm_func(C, after.butm_func_arg, after.a2);

		if (after.rename_func)
			after.rename_func(C, after.rename_arg1, after.rename_orig);
		if (after.rename_orig)
			MEM_freeN(after.rename_orig);

		if (after.undostr[0])
			ED_undo_push(C, after.undostr);
	}
}

static void ui_apply_but_BUT(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_BUTM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_but_value_set(but, but->hardmin);
	ui_apply_but_func(C, but);

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_BLOCK(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	if (but->type == UI_BTYPE_MENU)
		ui_but_value_set(but, data->value);

	ui_but_update_edited(but);
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_TOG(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	double value;
	int w, lvalue, push;

	value = ui_but_value_get(but);
	lvalue = (int)value;

	if (but->bit) {
		w = UI_BITBUT_TEST(lvalue, but->bitnr);
		if (w) lvalue = UI_BITBUT_CLR(lvalue, but->bitnr);
		else   lvalue = UI_BITBUT_SET(lvalue, but->bitnr);

		ui_but_value_set(but, (double)lvalue);
		if (but->type == UI_BTYPE_ICON_TOGGLE || but->type == UI_BTYPE_ICON_TOGGLE_N) {
			ui_but_update_edited(but);
		}
	}
	else {

		if (value == 0.0) push = 1;
		else push = 0;

		if (ELEM(but->type, UI_BTYPE_TOGGLE_N, UI_BTYPE_ICON_TOGGLE_N, UI_BTYPE_CHECKBOX_N)) push = !push;
		ui_but_value_set(but, (double)push);
		if (but->type == UI_BTYPE_ICON_TOGGLE || but->type == UI_BTYPE_ICON_TOGGLE_N) {
			ui_but_update_edited(but);
		}
	}

	ui_apply_but_func(C, but);

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_ROW(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data)
{
	uiBut *bt;

	ui_but_value_set(but, but->hardmax);

	ui_apply_but_func(C, but);

	/* states of other row buttons */
	for (bt = block->buttons.first; bt; bt = bt->next) {
		if (bt != but && bt->poin == but->poin && ELEM(bt->type, UI_BTYPE_ROW, UI_BTYPE_LISTROW)) {
			ui_but_update_edited(bt);
		}
	}

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_TEX(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	if (!data->str)
		return;

	ui_but_string_set(C, but, data->str);
	ui_but_update_edited(but);

	/* give butfunc a copy of the original text too.
	 * feature used for bone renaming, channels, etc.
	 * afterfunc frees rename_orig */
	if (data->origstr && (but->flag & UI_BUT_TEXTEDIT_UPDATE)) {
		/* In this case, we need to keep origstr available, to restore real org string in case we cancel after
		 * having typed something already. */
		but->rename_orig = BLI_strdup(data->origstr);
	}
	/* only if there are afterfuncs, otherwise 'renam_orig' isn't freed */
	else if (ui_afterfunc_check(but->block, but)) {
		but->rename_orig = data->origstr;
		data->origstr = NULL;
	}
	ui_apply_but_func(C, but);

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_TAB(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	if (data->str) {
		ui_but_string_set(C, but, data->str);
		ui_but_update_edited(but);
	}
	else {
		ui_but_value_set(but, but->hardmax);
		ui_apply_but_func(C, but);
	}

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_NUM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	if (data->str) {
		if (ui_but_string_set(C, but, data->str)) {
			data->value = ui_but_value_get(but);
		}
		else {
			data->cancel = true;
			return;
		}
	}
	else {
		ui_but_value_set(but, data->value);
	}

	ui_but_update_edited(but);
	ui_apply_but_func(C, but);

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_VEC(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_but_v3_set(but, data->vec);
	ui_but_update_edited(but);
	ui_apply_but_func(C, but);

	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_COLORBAND(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_CURVE(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}

/* ****************** drag drop code *********************** */


#ifdef USE_DRAG_MULTINUM

/* small multi-but api */
static void ui_multibut_add(uiHandleButtonData *data, uiBut *but)
{
	uiButMultiState *mbut_state;

	BLI_assert(but->flag & UI_BUT_DRAG_MULTI);
	BLI_assert(data->multi_data.has_mbuts);


	mbut_state = MEM_callocN(sizeof(*mbut_state), __func__);
	mbut_state->but = but;
	mbut_state->origvalue = ui_but_value_get(but);

	BLI_linklist_prepend(&data->multi_data.mbuts, mbut_state);

	UI_butstore_register(data->multi_data.bs_mbuts, &mbut_state->but);
}

static uiButMultiState *ui_multibut_lookup(uiHandleButtonData *data, const uiBut *but)
{
	LinkNode *l;

	for (l = data->multi_data.mbuts; l; l = l->next) {
		uiButMultiState *mbut_state;

		mbut_state = l->link;

		if (mbut_state->but == but) {
			return mbut_state;
		}
	}

	return NULL;
}

static void ui_multibut_restore(bContext *C, uiHandleButtonData *data, uiBlock *block)
{
	uiBut *but;

	for (but = block->buttons.first; but; but = but->next) {
		if (but->flag & UI_BUT_DRAG_MULTI) {
			uiButMultiState *mbut_state = ui_multibut_lookup(data, but);
			if (mbut_state) {
				ui_but_value_set(but, mbut_state->origvalue);

#ifdef USE_ALLSELECT
				if (mbut_state->select_others.elems_len > 0) {
					ui_selectcontext_apply(
					        C, but, &mbut_state->select_others,
					        mbut_state->origvalue, mbut_state->origvalue);
				}
#else
				UNUSED_VARS(C);
#endif
			}
		}
	}
}

static void ui_multibut_free(uiHandleButtonData *data, uiBlock *block)
{
#ifdef USE_ALLSELECT
	if (data->multi_data.mbuts) {
		LinkNode *list = data->multi_data.mbuts;
		while (list) {
			LinkNode *next = list->next;
			uiButMultiState *mbut_state = list->link;

			if (mbut_state->select_others.elems) {
				MEM_freeN(mbut_state->select_others.elems);
			}

			MEM_freeN(list->link);
			MEM_freeN(list);
			list = next;
		}
	}
#else
	BLI_linklist_freeN(data->multi_data.mbuts);
#endif

	data->multi_data.mbuts = NULL;

	if (data->multi_data.bs_mbuts) {
		UI_butstore_free(block, data->multi_data.bs_mbuts);
		data->multi_data.bs_mbuts = NULL;
	}
}

static bool ui_multibut_states_tag(
        uiBut *but_active,
        uiHandleButtonData *data, const wmEvent *event)
{
	uiBut *but;
	float seg[2][2];
	bool changed = false;

	seg[0][0] = data->multi_data.drag_start[0];
	seg[0][1] = data->multi_data.drag_start[1];

	seg[1][0] = event->x;
	seg[1][1] = event->y;

	BLI_assert(data->multi_data.init == BUTTON_MULTI_INIT_SETUP);

	ui_window_to_block_fl(data->region, but_active->block, &seg[0][0], &seg[0][1]);
	ui_window_to_block_fl(data->region, but_active->block, &seg[1][0], &seg[1][1]);

	data->multi_data.has_mbuts = false;

	/* follow ui_but_find_mouse_over_ex logic */
	for (but = but_active->block->buttons.first; but; but = but->next) {
		bool drag_prev = false;
		bool drag_curr = false;

		/* re-set each time */
		if (but->flag & UI_BUT_DRAG_MULTI) {
			but->flag &= ~UI_BUT_DRAG_MULTI;
			drag_prev = true;
		}

		if (ui_but_is_interactive(but, false)) {

			/* drag checks */
			if (but_active != but) {
				if (ui_but_is_compatible(but_active, but)) {

					BLI_assert(but->active == NULL);

					/* finally check for overlap */
					if (BLI_rctf_isect_segment(&but->rect, seg[0], seg[1])) {

						but->flag |= UI_BUT_DRAG_MULTI;
						data->multi_data.has_mbuts = true;
						drag_curr = true;
					}
				}
			}
		}

		changed |= (drag_prev != drag_curr);
	}

	return changed;
}

static void ui_multibut_states_create(uiBut *but_active, uiHandleButtonData *data)
{
	uiBut *but;

	BLI_assert(data->multi_data.init == BUTTON_MULTI_INIT_SETUP);
	BLI_assert(data->multi_data.has_mbuts);

	data->multi_data.bs_mbuts = UI_butstore_create(but_active->block);

	for (but = but_active->block->buttons.first; but; but = but->next) {
		if (but->flag & UI_BUT_DRAG_MULTI) {
			ui_multibut_add(data, but);
		}
	}

	/* edit buttons proportionally to eachother
	 * note: if we mix buttons which are proportional and others which are not,
	 * this may work a bit strangely */
	if (but_active->rnaprop) {
		if ((data->origvalue != 0.0) && (RNA_property_flag(but_active->rnaprop) & PROP_PROPORTIONAL)) {
			data->multi_data.is_proportional = true;
		}
	}
}

static void ui_multibut_states_apply(bContext *C, uiHandleButtonData *data, uiBlock *block)
{
	ARegion *ar = data->region;
	const double value_delta = data->value - data->origvalue;
	const double value_scale = data->multi_data.is_proportional ? (data->value / data->origvalue) : 0.0;
	uiBut *but;

	BLI_assert(data->multi_data.init == BUTTON_MULTI_INIT_ENABLE);
	BLI_assert(data->multi_data.skip == false);

	for (but = block->buttons.first; but; but = but->next) {
		if (but->flag & UI_BUT_DRAG_MULTI) {
			/* mbut_states for delta */
			uiButMultiState *mbut_state = ui_multibut_lookup(data, but);

			if (mbut_state) {
				void *active_back;

				ui_but_execute_begin(C, ar, but, &active_back);

#ifdef USE_ALLSELECT
				if (data->select_others.is_enabled) {
					/* init once! */
					if (mbut_state->select_others.elems_len == 0) {
						ui_selectcontext_begin(C, but, &mbut_state->select_others);
					}
					if (mbut_state->select_others.elems_len == 0) {
						mbut_state->select_others.elems_len = -1;
					}
				}

				/* needed so we apply the right deltas */
				but->active->origvalue = mbut_state->origvalue;
				but->active->select_others = mbut_state->select_others;
				but->active->select_others.do_free = false;
#endif

				BLI_assert(active_back == NULL);
				/* no need to check 'data->state' here */
				if (data->str) {
					/* entering text (set all) */
					but->active->value = data->value;
					ui_but_string_set(C, but, data->str);
				}
				else {
					/* dragging (use delta) */
					if (data->multi_data.is_proportional) {
						but->active->value = mbut_state->origvalue * value_scale;
					}
					else {
						but->active->value = mbut_state->origvalue + value_delta;
					}

					/* clamp based on soft limits, see: T40154 */
					CLAMP(but->active->value, (double)but->softmin, (double)but->softmax);
				}
				ui_but_execute_end(C, ar, but, active_back);
			}
			else {
				/* highly unlikely */
				printf("%s: cant find button\n", __func__);
			}
			/* end */

		}
	}
}

#endif  /* USE_DRAG_MULTINUM */


#ifdef USE_DRAG_TOGGLE

/* Helpers that wrap boolean functions, to support different kinds of buttons. */

static bool ui_drag_toggle_but_is_supported(const uiBut *but)
{
	if (ui_but_is_bool(but)) {
		return true;
	}
	else if (UI_but_is_decorator(but)) {
		return ELEM(but->icon, ICON_DECORATE, ICON_DECORATE_KEYFRAME, ICON_DECORATE_ANIMATE, ICON_DECORATE_OVERRIDE);
	}
	else {
		return false;
	}
}

static bool ui_drag_toggle_but_is_pushed(uiBut *but)
{
	if (ui_but_is_bool(but)) {
		return ui_but_is_pushed(but);
	}
	else if (UI_but_is_decorator(but)) {
		return (but->icon == ICON_DECORATE_KEYFRAME);
	}
	else {
		return false;
	}
}

typedef struct uiDragToggleHandle {
	/* init */
	bool is_set;
	float but_cent_start[2];

	bool is_xy_lock_init;
	bool    xy_lock[2];

	int  xy_init[2];
	int  xy_last[2];
} uiDragToggleHandle;

static bool ui_drag_toggle_set_xy_xy(
        bContext *C, ARegion *ar, const bool is_set,
        const int xy_src[2], const int xy_dst[2])
{
	/* popups such as layers won't re-evaluate on redraw */
	const bool do_check = (ar->regiontype == RGN_TYPE_TEMPORARY);
	bool changed = false;
	uiBlock *block;

	for (block = ar->uiblocks.first; block; block = block->next) {
		uiBut *but;

		float xy_a_block[2] = {UNPACK2(xy_src)};
		float xy_b_block[2] = {UNPACK2(xy_dst)};

		ui_window_to_block_fl(ar, block, &xy_a_block[0], &xy_a_block[1]);
		ui_window_to_block_fl(ar, block, &xy_b_block[0], &xy_b_block[1]);

		for (but = block->buttons.first; but; but = but->next) {
			/* Note: ctrl is always true here because (at least for now) we always want to consider text control
			 *       in this case, even when not embossed. */
			if (ui_but_is_interactive(but, true)) {
				if (BLI_rctf_isect_segment(&but->rect, xy_a_block, xy_b_block)) {

					/* execute the button */
					if (ui_drag_toggle_but_is_supported(but)) {
						/* is it pressed? */
						bool is_set_but = ui_drag_toggle_but_is_pushed(but);
						if (is_set_but != is_set) {
							UI_but_execute(C, but);
							if (do_check) {
								ui_but_update_edited(but);
							}
							changed = true;
						}
					}
					/* done */

				}
			}
		}
	}
	if (changed) {
		/* apply now, not on release (or if handlers are canceled for whatever reason) */
		ui_apply_but_funcs_after(C);
	}

	return changed;
}

static void ui_drag_toggle_set(bContext *C, uiDragToggleHandle *drag_info, const int xy_input[2])
{
	ARegion *ar = CTX_wm_region(C);
	bool do_draw = false;
	int xy[2];

	/**
	 * Initialize Locking:
	 *
	 * Check if we need to initialize the lock axis by finding if the first
	 * button we mouse over is X or Y aligned, then lock the mouse to that axis after.
	 */
	if (drag_info->is_xy_lock_init == false) {
		/* first store the buttons original coords */
		uiBut *but = ui_but_find_mouse_over_ex(ar, xy_input[0], xy_input[1], true);

		if (but) {
			if (but->flag & UI_BUT_DRAG_LOCK) {
				const float but_cent_new[2] = {
					BLI_rctf_cent_x(&but->rect),
					BLI_rctf_cent_y(&but->rect),
				};

				/* check if this is a different button, chances are high the button wont move about :) */
				if (len_manhattan_v2v2(drag_info->but_cent_start, but_cent_new) > 1.0f) {
					if (fabsf(drag_info->but_cent_start[0] - but_cent_new[0]) <
					    fabsf(drag_info->but_cent_start[1] - but_cent_new[1]))
					{
						drag_info->xy_lock[0] = true;
					}
					else {
						drag_info->xy_lock[1] = true;
					}
					drag_info->is_xy_lock_init = true;
				}
			}
			else {
				drag_info->is_xy_lock_init = true;
			}
		}
	}
	/* done with axis locking */


	xy[0] = (drag_info->xy_lock[0] == false) ? xy_input[0] : drag_info->xy_last[0];
	xy[1] = (drag_info->xy_lock[1] == false) ? xy_input[1] : drag_info->xy_last[1];


	/* touch all buttons between last mouse coord and this one */
	do_draw = ui_drag_toggle_set_xy_xy(C, ar, drag_info->is_set, drag_info->xy_last, xy);

	if (do_draw) {
		ED_region_tag_redraw(ar);
	}

	copy_v2_v2_int(drag_info->xy_last, xy);
}

static void ui_handler_region_drag_toggle_remove(bContext *UNUSED(C), void *userdata)
{
	uiDragToggleHandle *drag_info = userdata;
	MEM_freeN(drag_info);
}

static int ui_handler_region_drag_toggle(bContext *C, const wmEvent *event, void *userdata)
{
	uiDragToggleHandle *drag_info = userdata;
	bool done = false;

	switch (event->type) {
		case LEFTMOUSE:
		{
			if (event->val == KM_RELEASE) {
				done = true;
			}
			break;
		}
		case MOUSEMOVE:
		{
			ui_drag_toggle_set(C, drag_info, &event->x);
			break;
		}
	}

	if (done) {
		wmWindow *win = CTX_wm_window(C);
		ARegion *ar = CTX_wm_region(C);
		uiBut *but = ui_but_find_mouse_over_ex(ar, drag_info->xy_init[0], drag_info->xy_init[1], true);

		if (but) {
			ui_apply_but_undo(but);
		}

		WM_event_remove_ui_handler(
		        &win->modalhandlers,
		        ui_handler_region_drag_toggle,
		        ui_handler_region_drag_toggle_remove,
		        drag_info, false);
		ui_handler_region_drag_toggle_remove(C, drag_info);

		WM_event_add_mousemove(C);
		return WM_UI_HANDLER_BREAK;
	}
	else {
		return WM_UI_HANDLER_CONTINUE;
	}
}

static bool ui_but_is_drag_toggle(const uiBut *but)
{
	return ((ui_drag_toggle_but_is_supported(but) == true) &&
	        /* menu check is importnt so the button dragged over isn't removed instantly */
	        (ui_block_is_menu(but->block) == false));
}

#endif  /* USE_DRAG_TOGGLE */


#ifdef USE_ALLSELECT

static bool ui_selectcontext_begin(
        bContext *C, uiBut *but, uiSelectContextStore *selctx_data)
{
	PointerRNA ptr, lptr, idptr;
	PropertyRNA *prop, *lprop;
	bool success = false;
	int index;

	char *path = NULL;
	ListBase lb = {NULL};

	ptr = but->rnapoin;
	prop = but->rnaprop;
	index = but->rnaindex;

	/* for now don't support whole colors */
	if (index == -1)
		return false;

	/* if there is a valid property that is editable... */
	if (ptr.data && prop) {
		CollectionPointerLink *link;
		bool use_path_from_id;
		int i;

		/* some facts we want to know */
		const bool is_array = RNA_property_array_check(prop);
		const int rna_type = RNA_property_type(prop);

		if (UI_context_copy_to_selected_list(C, &ptr, prop, &lb, &use_path_from_id, &path) &&
		    !BLI_listbase_is_empty(&lb))
		{
			selctx_data->elems_len = BLI_listbase_count(&lb);
			selctx_data->elems = MEM_mallocN(sizeof(uiSelectContextElem) * selctx_data->elems_len, __func__);

			for (i = 0, link = lb.first; i < selctx_data->elems_len; i++, link = link->next) {
				uiSelectContextElem *other = &selctx_data->elems[i];
				/* TODO,. de-duplicate copy_to_selected_button */
				if (link->ptr.data != ptr.data) {
					if (use_path_from_id) {
						/* Path relative to ID. */
						lprop = NULL;
						RNA_id_pointer_create(link->ptr.id.data, &idptr);
						RNA_path_resolve_property(&idptr, path, &lptr, &lprop);
					}
					else if (path) {
						/* Path relative to elements from list. */
						lprop = NULL;
						RNA_path_resolve_property(&link->ptr, path, &lptr, &lprop);
					}
					else {
						lptr = link->ptr;
						lprop = prop;
					}

					/* lptr might not be the same as link->ptr! */
					if ((lptr.data != ptr.data) &&
					    (lprop == prop) &&
					    RNA_property_editable(&lptr, lprop))
					{
						other->ptr = lptr;
						if (is_array) {
							if (rna_type == PROP_FLOAT) {
								other->val_f = RNA_property_float_get_index(&lptr, lprop, index);
							}
							else if (rna_type == PROP_INT) {
								other->val_i = RNA_property_int_get_index(&lptr, lprop, index);
							}
							/* ignored for now */
#if 0
							else if (rna_type == PROP_BOOLEAN) {
								other->val_b = RNA_property_boolean_get_index(&lptr, lprop, index);
							}
#endif
						}
						else {
							if (rna_type == PROP_FLOAT) {
								other->val_f = RNA_property_float_get(&lptr, lprop);
							}
							else if (rna_type == PROP_INT) {
								other->val_i = RNA_property_int_get(&lptr, lprop);
							}
							/* ignored for now */
#if 0
							else if (rna_type == PROP_BOOLEAN) {
								other->val_b = RNA_property_boolean_get(&lptr, lprop);
							}
							else if (rna_type == PROP_ENUM) {
								other->val_i = RNA_property_enum_get(&lptr, lprop);
							}
#endif
						}

						continue;
					}
				}

				selctx_data->elems_len -= 1;
				i -= 1;
			}

			success = (selctx_data->elems_len != 0);
		}
	}

	if (selctx_data->elems_len == 0) {
		MEM_SAFE_FREE(selctx_data->elems);
	}

	MEM_SAFE_FREE(path);
	BLI_freelistN(&lb);

	/* caller can clear */
	selctx_data->do_free = true;

	if (success) {
		but->flag |= UI_BUT_IS_SELECT_CONTEXT;
	}

	return success;
}

static void ui_selectcontext_end(
        uiBut *but, uiSelectContextStore *selctx_data)
{
	if (selctx_data->do_free) {
		if (selctx_data->elems) {
			MEM_freeN(selctx_data->elems);
		}
	}

	but->flag &= ~UI_BUT_IS_SELECT_CONTEXT;
}

static void ui_selectcontext_apply(
        bContext *C, uiBut *but, uiSelectContextStore *selctx_data,
        const double value, const double value_orig)
{
	if (selctx_data->elems) {
		PropertyRNA *prop = but->rnaprop;
		PropertyRNA *lprop = but->rnaprop;
		int index = but->rnaindex;
		int i;
		const bool use_delta = (selctx_data->is_copy == false);

		union {
			bool  b;
			int   i;
			float f;
			PointerRNA p;
		} delta, min, max;

		const bool is_array = RNA_property_array_check(prop);
		const int rna_type = RNA_property_type(prop);

		if (rna_type == PROP_FLOAT) {
			delta.f = use_delta ? (value - value_orig) : value;
			RNA_property_float_range(&but->rnapoin, prop, &min.f, &max.f);
		}
		else if (rna_type == PROP_INT) {
			delta.i = use_delta ? ((int)value - (int)value_orig) : (int)value;
			RNA_property_int_range(&but->rnapoin, prop, &min.i, &max.i);
		}
		else if (rna_type == PROP_ENUM) {
			delta.i = RNA_property_enum_get(&but->rnapoin, prop);  /* not a delta infact */
		}
		else if (rna_type == PROP_BOOLEAN) {
			if (is_array) {
				delta.b = RNA_property_boolean_get_index(&but->rnapoin, prop, index);  /* not a delta infact */
			}
			else {
				delta.b = RNA_property_boolean_get(&but->rnapoin, prop);  /* not a delta infact */
			}
		}
		else if (rna_type == PROP_POINTER) {
			delta.p = RNA_property_pointer_get(&but->rnapoin, prop);  /* not a delta infact */
		}

#ifdef USE_ALLSELECT_LAYER_HACK
		/* make up for not having 'handle_layer_buttons' */
		{
			PropertySubType subtype = RNA_property_subtype(prop);

			if ((rna_type == PROP_BOOLEAN) &&
			    ELEM(subtype, PROP_LAYER, PROP_LAYER_MEMBER) &&
			    is_array &&
			    /* could check for 'handle_layer_buttons' */
			    but->func)
			{
				wmWindow *win = CTX_wm_window(C);
				if (!win->eventstate->shift) {
					const int len = RNA_property_array_length(&but->rnapoin, prop);
					bool *tmparray = MEM_callocN(sizeof(bool) * len, __func__);

					tmparray[index] = true;

					for (i = 0; i < selctx_data->elems_len; i++) {
						uiSelectContextElem *other = &selctx_data->elems[i];
						PointerRNA lptr = other->ptr;
						RNA_property_boolean_set_array(&lptr, lprop, tmparray);
						RNA_property_update(C, &lptr, lprop);
					}

					MEM_freeN(tmparray);

					return;
				}
			}
		}
#endif

		for (i = 0; i < selctx_data->elems_len; i++) {
			uiSelectContextElem *other = &selctx_data->elems[i];
			PointerRNA lptr = other->ptr;

			if (rna_type == PROP_FLOAT) {
				float other_value = use_delta ? (other->val_f + delta.f) : delta.f;
				CLAMP(other_value, min.f, max.f);
				if (is_array) {
					RNA_property_float_set_index(&lptr, lprop, index, other_value);
				}
				else {
					RNA_property_float_set(&lptr, lprop, other_value);
				}
			}
			else if (rna_type == PROP_INT) {
				int other_value = use_delta ? (other->val_i + delta.i) : delta.i;
				CLAMP(other_value, min.i, max.i);
				if (is_array) {
					RNA_property_int_set_index(&lptr, lprop, index, other_value);
				}
				else {
					RNA_property_int_set(&lptr, lprop, other_value);
				}
			}
			else if (rna_type == PROP_BOOLEAN) {
				const bool other_value = delta.b;
				if (is_array) {
					RNA_property_boolean_set_index(&lptr, lprop, index, other_value);
				}
				else {
					RNA_property_boolean_set(&lptr, lprop, delta.b);
				}
			}
			else if (rna_type == PROP_ENUM) {
				const int other_value = delta.i;
				BLI_assert(!is_array);
				RNA_property_enum_set(&lptr, lprop, other_value);
			}
			else if (rna_type == PROP_POINTER) {
				const PointerRNA other_value = delta.p;
				RNA_property_pointer_set(&lptr, lprop, other_value);
			}

			RNA_property_update(C, &lptr, prop);
		}
	}
}

#endif  /* USE_ALLSELECT */


static bool ui_but_contains_point_px_icon(uiBut *but, ARegion *ar, const wmEvent *event)
{
	rcti rect;
	int x = event->x, y = event->y;

	ui_window_to_block(ar, but->block, &x, &y);

	BLI_rcti_rctf_copy(&rect, &but->rect);

	if (but->imb || but->type == UI_BTYPE_COLOR) {
		/* use button size itself */
	}
	else if (but->drawflag & UI_BUT_ICON_LEFT) {
		rect.xmax = rect.xmin + (BLI_rcti_size_y(&rect));
	}
	else {
		int delta = BLI_rcti_size_x(&rect) - BLI_rcti_size_y(&rect);
		rect.xmin += delta / 2;
		rect.xmax -= delta / 2;
	}

	return BLI_rcti_isect_pt(&rect, x, y);
}

static bool ui_but_drag_init(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	/* prevent other WM gestures to start while we try to drag */
	WM_gestures_remove(C);

	if (ABS(data->dragstartx - event->x) + ABS(data->dragstarty - event->y) > U.dragthreshold * U.dpi_fac) {

		button_activate_state(C, but, BUTTON_STATE_EXIT);
		data->cancel = true;
#ifdef USE_DRAG_TOGGLE
		if (ui_drag_toggle_but_is_supported(but)) {
			uiDragToggleHandle *drag_info = MEM_callocN(sizeof(*drag_info), __func__);
			ARegion *ar_prev;

			/* call here because regular mouse-up event wont run,
			 * typically 'button_activate_exit()' handles this */
			ui_apply_but_autokey(C, but);

			drag_info->is_set = ui_drag_toggle_but_is_pushed(but);
			drag_info->but_cent_start[0] = BLI_rctf_cent_x(&but->rect);
			drag_info->but_cent_start[1] = BLI_rctf_cent_y(&but->rect);
			copy_v2_v2_int(drag_info->xy_init, &event->x);
			copy_v2_v2_int(drag_info->xy_last, &event->x);

			/* needed for toggle drag on popups */
			ar_prev = CTX_wm_region(C);
			CTX_wm_region_set(C, data->region);

			WM_event_add_ui_handler(
			        C, &data->window->modalhandlers,
			        ui_handler_region_drag_toggle,
			        ui_handler_region_drag_toggle_remove,
			        drag_info, WM_HANDLER_BLOCKING);

			CTX_wm_region_set(C, ar_prev);

			/* Initialize alignment for single row/column regions,
			 * otherwise we use the relative position of the first other button dragged over. */
			if (ELEM(data->region->regiontype, RGN_TYPE_NAV_BAR, RGN_TYPE_HEADER)) {
				int lock_axis = -1;
				if (ELEM(data->region->alignment, RGN_ALIGN_LEFT, RGN_ALIGN_RIGHT)) {
					lock_axis = 0;
				}
				else if (ELEM(data->region->alignment, RGN_ALIGN_TOP, RGN_ALIGN_BOTTOM)) {
					lock_axis = 1;
				}
				if (lock_axis != -1) {
					drag_info->xy_lock[lock_axis] = true;
					drag_info->is_xy_lock_init = true;
				}
			}
		}
		else
#endif
		if (but->type == UI_BTYPE_COLOR) {
			bool valid = false;
			uiDragColorHandle *drag_info = MEM_callocN(sizeof(*drag_info), __func__);

			/* TODO support more button pointer types */
			if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA) {
				ui_but_v3_get(but, drag_info->color);
				drag_info->gamma_corrected = true;
				valid = true;
			}
			else if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR) {
				ui_but_v3_get(but, drag_info->color);
				drag_info->gamma_corrected = false;
				valid = true;
			}
			else if (ELEM(but->pointype, UI_BUT_POIN_FLOAT, UI_BUT_POIN_CHAR)) {
				ui_but_v3_get(but, drag_info->color);
				copy_v3_v3(drag_info->color, (float *)but->poin);
				valid = true;
			}

			if (valid) {
				WM_event_start_drag(C, ICON_COLOR, WM_DRAG_COLOR, drag_info, 0.0, WM_DRAG_FREE_DATA);
			}
			else {
				MEM_freeN(drag_info);
				return false;
			}
		}
		else {
			wmDrag *drag = WM_event_start_drag(
			        C, but->icon, but->dragtype, but->dragpoin,
			        ui_but_value_get(but), WM_DRAG_NOP);

			if (but->imb) {
				WM_event_drag_image(
				        drag, but->imb, but->imb_scale,
				        BLI_rctf_size_x(&but->rect),
				        BLI_rctf_size_y(&but->rect));
			}
		}
		return true;
	}

	return false;
}

/* ********************** linklines *********************** */

static void ui_apply_but_IMAGE(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_HISTOGRAM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_WAVEFORM(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}

static void ui_apply_but_TRACKPREVIEW(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	ui_apply_but_func(C, but);
	data->retval = but->retval;
	data->applied = true;
}


static void ui_apply_but(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, const bool interactive)
{
	char *editstr;
	double *editval;
	float *editvec;
	ColorBand *editcoba;
	CurveMapping *editcumap;

	data->retval = 0;

	/* if we cancel and have not applied yet, there is nothing to do,
	 * otherwise we have to restore the original value again */
	if (data->cancel) {
		if (!data->applied)
			return;

		if (data->str) MEM_freeN(data->str);
		data->str = data->origstr;
		data->origstr = NULL;
		data->value = data->origvalue;
		copy_v3_v3(data->vec, data->origvec);
		/* postpone clearing origdata */
	}
	else {
		/* we avoid applying interactive edits a second time
		 * at the end with the appliedinteractive flag */
		if (interactive) {
			data->applied_interactive = true;
		}
		else if (data->applied_interactive) {
			return;
		}

#ifdef USE_ALLSELECT
#  ifdef USE_DRAG_MULTINUM
		if (but->flag & UI_BUT_DRAG_MULTI) {
			/* pass */
		}
		else
#  endif
		if (data->select_others.elems_len == 0) {
			wmWindow *win = CTX_wm_window(C);
			/* may have been enabled before activating */
			if (data->select_others.is_enabled || IS_ALLSELECT_EVENT(win->eventstate)) {
				ui_selectcontext_begin(C, but, &data->select_others);
				data->select_others.is_enabled = true;
			}
		}
		if (data->select_others.elems_len == 0) {
			/* dont check again */
			data->select_others.elems_len = -1;
		}
#endif
	}

	/* ensures we are writing actual values */
	editstr = but->editstr;
	editval = but->editval;
	editvec = but->editvec;
	editcoba = but->editcoba;
	editcumap = but->editcumap;
	but->editstr = NULL;
	but->editval = NULL;
	but->editvec = NULL;
	but->editcoba = NULL;
	but->editcumap = NULL;

	/* handle different types */
	switch (but->type) {
		case UI_BTYPE_BUT:
			ui_apply_but_BUT(C, but, data);
			break;
		case UI_BTYPE_TEXT:
		case UI_BTYPE_SEARCH_MENU:
			ui_apply_but_TEX(C, but, data);
			break;
		case UI_BTYPE_BUT_TOGGLE:
		case UI_BTYPE_TOGGLE:
		case UI_BTYPE_TOGGLE_N:
		case UI_BTYPE_ICON_TOGGLE:
		case UI_BTYPE_ICON_TOGGLE_N:
		case UI_BTYPE_CHECKBOX:
		case UI_BTYPE_CHECKBOX_N:
			ui_apply_but_TOG(C, but, data);
			break;
		case UI_BTYPE_ROW:
		case UI_BTYPE_LISTROW:
			ui_apply_but_ROW(C, block, but, data);
			break;
		case UI_BTYPE_TAB:
			ui_apply_but_TAB(C, but, data);
			break;
		case UI_BTYPE_SCROLL:
		case UI_BTYPE_GRIP:
		case UI_BTYPE_NUM:
		case UI_BTYPE_NUM_SLIDER:
			ui_apply_but_NUM(C, but, data);
			break;
		case UI_BTYPE_MENU:
		case UI_BTYPE_BLOCK:
		case UI_BTYPE_PULLDOWN:
			ui_apply_but_BLOCK(C, but, data);
			break;
		case UI_BTYPE_COLOR:
			if (data->cancel)
				ui_apply_but_VEC(C, but, data);
			else
				ui_apply_but_BLOCK(C, but, data);
			break;
		case UI_BTYPE_BUT_MENU:
			ui_apply_but_BUTM(C, but, data);
			break;
		case UI_BTYPE_UNITVEC:
		case UI_BTYPE_HSVCUBE:
		case UI_BTYPE_HSVCIRCLE:
			ui_apply_but_VEC(C, but, data);
			break;
		case UI_BTYPE_COLORBAND:
			ui_apply_but_COLORBAND(C, but, data);
			break;
		case UI_BTYPE_CURVE:
			ui_apply_but_CURVE(C, but, data);
			break;
		case UI_BTYPE_KEY_EVENT:
		case UI_BTYPE_HOTKEY_EVENT:
			ui_apply_but_BUT(C, but, data);
			break;
		case UI_BTYPE_IMAGE:
			ui_apply_but_IMAGE(C, but, data);
			break;
		case UI_BTYPE_HISTOGRAM:
			ui_apply_but_HISTOGRAM(C, but, data);
			break;
		case UI_BTYPE_WAVEFORM:
			ui_apply_but_WAVEFORM(C, but, data);
			break;
		case UI_BTYPE_TRACK_PREVIEW:
			ui_apply_but_TRACKPREVIEW(C, but, data);
			break;
		default:
			break;
	}

#ifdef USE_DRAG_MULTINUM
	if (data->multi_data.has_mbuts) {
		if ((data->multi_data.init == BUTTON_MULTI_INIT_ENABLE) &&
		    (data->multi_data.skip == false))
		{
			if (data->cancel) {
				ui_multibut_restore(C, data, block);
			}
			else {
				ui_multibut_states_apply(C, data, block);
			}
		}
	}
#endif

#ifdef USE_ALLSELECT
	ui_selectcontext_apply(C, but, &data->select_others, data->value, data->origvalue);
#endif

	if (data->cancel) {
		data->origvalue = 0.0;
		zero_v3(data->origvec);
	}

	but->editstr = editstr;
	but->editval = editval;
	but->editvec = editvec;
	but->editcoba = editcoba;
	but->editcumap = editcumap;
}

/* ******************* drop event ********************  */

/* only call if event type is EVT_DROP */
static void ui_but_drop(bContext *C, const wmEvent *event, uiBut *but, uiHandleButtonData *data)
{
	wmDrag *wmd;
	ListBase *drags = event->customdata; /* drop event type has listbase customdata by default */

	for (wmd = drags->first; wmd; wmd = wmd->next) {
		if (wmd->type == WM_DRAG_ID) {
			/* align these types with UI_but_active_drop_name */
			if (ELEM(but->type, UI_BTYPE_TEXT, UI_BTYPE_SEARCH_MENU)) {
				ID *id = WM_drag_ID(wmd, 0);

				button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);

				ui_textedit_string_set(but, data, id->name + 2);

				if (ELEM(but->type, UI_BTYPE_SEARCH_MENU)) {
					but->changed = true;
					ui_searchbox_update(C, data->searchbox, but, true);
				}

				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
	}

}

/* ******************* copy and paste ********************  */

static bool ui_but_contains_password(uiBut *but)
{
	return but->rnaprop && (RNA_property_subtype(but->rnaprop) == PROP_PASSWORD);
}

static void ui_but_get_pasted_text_from_clipboard(char **buf_paste, int *buf_len)
{
	char *text;
	int length;
	/* get only first line even if the clipboard contains multiple lines */
	text = WM_clipboard_text_get_firstline(false, &length);

	if (text) {
		*buf_paste = text;
		*buf_len = length;
	}
	else {
		*buf_paste = MEM_callocN(sizeof(char), __func__);
		*buf_len = 0;
	}
}

static int get_but_property_array_length(uiBut *but)
{
	return RNA_property_array_length(&but->rnapoin, but->rnaprop);
}

static void ui_but_set_float_array(bContext *C, uiBut *but, uiHandleButtonData *data, float *values, int array_length)
{
	button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

	for (int i = 0; i < array_length; i++) {
		RNA_property_float_set_index(&but->rnapoin, but->rnaprop, i, values[i]);
	}
	if (data) data->value = values[but->rnaindex];

	button_activate_state(C, but, BUTTON_STATE_EXIT);
}

static void float_array_to_string(float *values, int array_length, char *output, int output_len_max)
{
	/* to avoid buffer overflow attacks; numbers are quite arbitrary */
	BLI_assert(output_len_max > 15);
	output_len_max -= 10;

	int current_index = 0;
	output[current_index] = '[';
	current_index++;

	for (int i = 0; i < array_length; i++) {
		int length = BLI_snprintf(output + current_index, output_len_max - current_index, "%f", values[i]);
		current_index += length;

		if (i < array_length - 1) {
			if (current_index < output_len_max) {
				output[current_index + 0] = ',';
				output[current_index + 1] = ' ';
				current_index += 2;
			}
		}
	}

	output[current_index + 0] = ']';
	output[current_index + 1] = '\0';
}

static void ui_but_copy_numeric_array(uiBut *but, char *output, int output_len_max)
{
	int array_length = get_but_property_array_length(but);
	float *values = alloca(array_length * sizeof(float));
	RNA_property_float_get_array(&but->rnapoin, but->rnaprop, values);
	float_array_to_string(values, array_length, output, output_len_max);
}

static bool parse_float_array(char *text, float *values, int expected_length)
{
	/* can parse max 4 floats for now */
	BLI_assert(0 <= expected_length && expected_length <= 4);

	float v[5];
	int actual_length = sscanf(text, "[%f, %f, %f, %f, %f]", &v[0], &v[1], &v[2], &v[3], &v[4]);

	if (actual_length == expected_length) {
		memcpy(values, v, sizeof(float) * expected_length);
		return true;
	}
	else {
		return false;
	}
}

static void ui_but_paste_numeric_array(bContext *C, uiBut *but, uiHandleButtonData *data, char *buf_paste)
{
	int array_length = get_but_property_array_length(but);
	if (array_length > 4) {
		// not supported for now
		return;
	}

	float *values = alloca(sizeof(float) * array_length);

	if (parse_float_array(buf_paste, values, array_length)) {
		ui_but_set_float_array(C, but, data, values, array_length);
	}
	else {
		WM_report(RPT_ERROR, "Expected an array of numbers: [n, n, ...]");
	}
}

static void ui_but_copy_numeric_value(uiBut *but, char *output, int output_len_max)
{
	/* Get many decimal places, then strip trailing zeros.
	 * note: too high values start to give strange results */
	ui_but_string_get_ex(but, output, output_len_max, UI_PRECISION_FLOAT_MAX, false, NULL);
	BLI_str_rstrip_float_zero(output, '\0');
}

static void ui_but_paste_numeric_value(bContext *C, uiBut *but, uiHandleButtonData *data, char *buf_paste)
{
	double value;

	if (ui_but_string_set_eval_num(C, but, buf_paste, &value)) {
		button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
		data->value = value;
		ui_but_string_set(C, but, buf_paste);
		button_activate_state(C, but, BUTTON_STATE_EXIT);
	}
	else {
		WM_report(RPT_ERROR, "Expected a number");
	}
}

static bool ui_but_has_array_value(uiBut *but)
{
	return (but->rnapoin.data && but->rnaprop &&
	        ELEM(RNA_property_subtype(but->rnaprop), PROP_COLOR, PROP_TRANSLATION, PROP_DIRECTION,
	             PROP_VELOCITY, PROP_ACCELERATION, PROP_MATRIX, PROP_EULER, PROP_QUATERNION, PROP_AXISANGLE,
	             PROP_XYZ, PROP_XYZ_LENGTH, PROP_COLOR_GAMMA, PROP_COORDS));
}

static void ui_but_paste_normalized_vector(bContext *C, uiBut *but, char *buf_paste)
{
	float xyz[3];
	if (parse_float_array(buf_paste, xyz, 3)) {
		if (normalize_v3(xyz) == 0.0f) {
			/* better set Z up then have a zero vector */
			xyz[2] = 1.0;
		}
		ui_but_set_float_array(C, but, NULL, xyz, 3);
	}
	else {
		WM_report(RPT_ERROR, "Paste expected 3 numbers, formatted: '[n, n, n]'");
	}
}

static void ui_but_copy_color(uiBut *but, char *output, int output_len_max)
{
	float rgba[4];

	if (but->rnaprop && get_but_property_array_length(but) == 4)
		rgba[3] = RNA_property_float_get_index(&but->rnapoin, but->rnaprop, 3);
	else
		rgba[3] = 1.0f;

	ui_but_v3_get(but, rgba);

	/* convert to linear color to do compatible copy between gamma and non-gamma */
	if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA)
		srgb_to_linearrgb_v3_v3(rgba, rgba);

	float_array_to_string(rgba, 4, output, output_len_max);
}

static void ui_but_paste_color(bContext *C, uiBut *but, char *buf_paste)
{
	float rgba[4];
	if (parse_float_array(buf_paste, rgba, 4)) {
		if (but->rnaprop) {
			/* Assume linear colors in buffer. */
			if (RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA) {
				linearrgb_to_srgb_v3_v3(rgba, rgba);
			}

			/* Some color properties are RGB, not RGBA. */
			int array_len = get_but_property_array_length(but);
			BLI_assert(ELEM(array_len, 3, 4));
			ui_but_set_float_array(C, but, NULL, rgba, array_len);
		}
	}
	else {
		WM_report(RPT_ERROR, "Paste expected 4 numbers, formatted: '[n, n, n, n]'");
	}
}

static void ui_but_copy_text(uiBut *but, char *output, int output_len_max)
{
	ui_but_string_get(but, output, output_len_max);
}

static void ui_but_paste_text(bContext *C, uiBut *but, uiHandleButtonData *data, char *buf_paste)
{
	button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
	ui_textedit_string_set(but, but->active, buf_paste);

	if (but->type == UI_BTYPE_SEARCH_MENU) {
		but->changed = true;
		ui_searchbox_update(C, data->searchbox, but, true);
	}

	button_activate_state(C, but, BUTTON_STATE_EXIT);
}

static void ui_but_copy_colorband(uiBut *but)
{
	if (but->poin != NULL) {
		memcpy(&but_copypaste_coba, but->poin, sizeof(ColorBand));
	}
}

static void ui_but_paste_colorband(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	if (but_copypaste_coba.tot != 0) {
		if (!but->poin)
			but->poin = MEM_callocN(sizeof(ColorBand), "colorband");

		button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
		memcpy(data->coba, &but_copypaste_coba, sizeof(ColorBand));
		button_activate_state(C, but, BUTTON_STATE_EXIT);
	}
}

static void ui_but_copy_curvemapping(uiBut *but)
{
	if (but->poin != NULL) {
		but_copypaste_curve_alive = true;
		curvemapping_free_data(&but_copypaste_curve);
		curvemapping_copy_data(&but_copypaste_curve, (CurveMapping *) but->poin);
	}
}

static void ui_but_paste_curvemapping(bContext *C, uiBut *but)
{
	if (but_copypaste_curve_alive) {
		if (!but->poin)
			but->poin = MEM_callocN(sizeof(CurveMapping), "curvemapping");

		button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
		curvemapping_free_data((CurveMapping *) but->poin);
		curvemapping_copy_data((CurveMapping *) but->poin, &but_copypaste_curve);
		button_activate_state(C, but, BUTTON_STATE_EXIT);
	}
}

static void ui_but_copy_operator(bContext *C, uiBut *but, char *output, int output_len_max)
{
	PointerRNA *opptr;
	opptr = UI_but_operator_ptr_get(but);

	char *str;
	str = WM_operator_pystring_ex(C, NULL, false, true, but->optype, opptr);
	BLI_strncpy(output, str, output_len_max);
	MEM_freeN(str);
}

static void ui_but_copy_menu(uiBut *but, char *output, int output_len_max)
{
	MenuType *mt = UI_but_menutype_get(but);
	if (mt) {
		BLI_snprintf(output, output_len_max, "bpy.ops.wm.call_menu(name=\"%s\")", mt->idname);
	}
}

static void ui_but_copy(bContext *C, uiBut *but, const bool copy_array)
{
	if (ui_but_contains_password(but)) {
		return;
	}

	/* Arbitrary large value (allow for paths: 'PATH_MAX') */
	char buf[4096] = {0};
	const int buf_max_len = sizeof(buf);

	/* Left false for copying internal data (color-band for eg). */
	bool is_buf_set = false;

	bool has_required_data = !(but->poin == NULL && but->rnapoin.data == NULL);

	switch (but->type) {
		case UI_BTYPE_NUM:
		case UI_BTYPE_NUM_SLIDER:
			if (!has_required_data) break;
			if (copy_array && ui_but_has_array_value(but)) {
				ui_but_copy_numeric_array(but, buf, buf_max_len);
			}
			else {
				ui_but_copy_numeric_value(but, buf, buf_max_len);
			}
			is_buf_set = true;
			break;

		case UI_BTYPE_UNITVEC:
			if (!has_required_data) break;
			ui_but_copy_numeric_array(but, buf, buf_max_len);
			is_buf_set = true;
			break;

		case UI_BTYPE_COLOR:
			if (!has_required_data) break;
			ui_but_copy_color(but, buf, buf_max_len);
			is_buf_set = true;
			break;

		case UI_BTYPE_TEXT:
		case UI_BTYPE_SEARCH_MENU:
			if (!has_required_data) break;
			ui_but_copy_text(but, buf, buf_max_len);
			is_buf_set = true;
			break;

		case UI_BTYPE_COLORBAND:
			ui_but_copy_colorband(but);
			break;

		case UI_BTYPE_CURVE:
			ui_but_copy_curvemapping(but);
			break;

		case UI_BTYPE_BUT:
			ui_but_copy_operator(C, but, buf, buf_max_len);
			is_buf_set = true;
			break;

		case UI_BTYPE_MENU:
		case UI_BTYPE_PULLDOWN:
			ui_but_copy_menu(but, buf, buf_max_len);
			is_buf_set = true;
			break;

		default:
			break;
	}

	if (is_buf_set) {
		WM_clipboard_text_set(buf, 0);
	}
}

static void ui_but_paste(bContext *C, uiBut *but, uiHandleButtonData *data, const bool paste_array)
{
	BLI_assert((but->flag & UI_BUT_DISABLED) == 0); /* caller should check */

	int buf_paste_len = 0;
	char *buf_paste;
	ui_but_get_pasted_text_from_clipboard(&buf_paste, &buf_paste_len);

	bool has_required_data = !(but->poin == NULL && but->rnapoin.data == NULL);

	switch (but->type) {
		case UI_BTYPE_NUM:
		case UI_BTYPE_NUM_SLIDER:
			if (!has_required_data) break;
			if (paste_array && ui_but_has_array_value(but)) {
				ui_but_paste_numeric_array(C, but, data, buf_paste);
			}
			else {
				ui_but_paste_numeric_value(C, but, data, buf_paste);
			}
			break;

		case UI_BTYPE_UNITVEC:
			if (!has_required_data) break;
			ui_but_paste_normalized_vector(C, but, buf_paste);
			break;

		case UI_BTYPE_COLOR:
			if (!has_required_data) break;
			ui_but_paste_color(C, but, buf_paste);
			break;

		case UI_BTYPE_TEXT:
		case UI_BTYPE_SEARCH_MENU:
			if (!has_required_data) break;
			ui_but_paste_text(C, but, data, buf_paste);
			break;

		case UI_BTYPE_COLORBAND:
			ui_but_paste_colorband(C, but, data);
			break;

		case UI_BTYPE_CURVE:
			ui_but_paste_curvemapping(C, but);
			break;

		default:
			break;
	}

	MEM_freeN((void *)buf_paste);
}

/**
 * Password Text
 * =============
 *
 * Functions to convert password strings that should not be displayed
 * to asterisk representation (e.g. 'mysecretpasswd' -> '*************')
 *
 * It converts every UTF-8 character to an asterisk, and also remaps
 * the cursor position and selection start/end.
 *
 * \note: remapping is used, because password could contain UTF-8 characters.
 *
 */

static int ui_text_position_from_hidden(uiBut *but, int pos)
{
	const char *strpos, *butstr;
	int i;

	butstr = (but->editstr) ? but->editstr : but->drawstr;

	for (i = 0, strpos = butstr; i < pos; i++)
		strpos = BLI_str_find_next_char_utf8(strpos, NULL);

	return (strpos - butstr);
}

static int ui_text_position_to_hidden(uiBut *but, int pos)
{
	const char *butstr = (but->editstr) ? but->editstr : but->drawstr;
	return BLI_strnlen_utf8(butstr, pos);
}

void ui_but_text_password_hide(char password_str[UI_MAX_PASSWORD_STR], uiBut *but, const bool restore)
{
	char *butstr;

	if (!(but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_PASSWORD))
		return;

	butstr = (but->editstr) ? but->editstr : but->drawstr;

	if (restore) {
		/* restore original string */
		BLI_strncpy(butstr, password_str, UI_MAX_PASSWORD_STR);

		/* remap cursor positions */
		if (but->pos >= 0) {
			but->pos = ui_text_position_from_hidden(but, but->pos);
			but->selsta = ui_text_position_from_hidden(but, but->selsta);
			but->selend = ui_text_position_from_hidden(but, but->selend);
		}
	}
	else {
		/* convert text to hidden text using asterisks (e.g. pass -> ****) */
		const size_t len = BLI_strlen_utf8(butstr);

		/* remap cursor positions */
		if (but->pos >= 0) {
			but->pos = ui_text_position_to_hidden(but, but->pos);
			but->selsta = ui_text_position_to_hidden(but, but->selsta);
			but->selend = ui_text_position_to_hidden(but, but->selend);
		}

		/* save original string */
		BLI_strncpy(password_str, butstr, UI_MAX_PASSWORD_STR);
		memset(butstr, '*', len);
		butstr[len] = '\0';
	}
}

static void ui_but_text_clear(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	/* most likely NULL, but let's check, and give it temp zero string */
	if (!data->str) {
		data->str = MEM_callocN(1, "temp str");
	}
	data->str[0] = 0;

	ui_apply_but_TEX(C, but, data);
	button_activate_state(C, but, BUTTON_STATE_EXIT);
}


/* ************* in-button text selection/editing ************* */

static void ui_textedit_string_ensure_max_length(uiBut *but, uiHandleButtonData *data, int maxlen)
{
	BLI_assert(data->is_str_dynamic);
	BLI_assert(data->str == but->editstr);

	if (maxlen > data->maxlen) {
		data->str = but->editstr = MEM_reallocN(data->str, sizeof(char) * maxlen);
		data->maxlen = maxlen;
	}
}

static void ui_textedit_string_set(uiBut *but, uiHandleButtonData *data, const char *str)
{
	if (data->is_str_dynamic) {
		ui_textedit_string_ensure_max_length(but, data, strlen(str) + 1);
	}

	if (ui_but_is_utf8(but)) {
		BLI_strncpy_utf8(data->str, str, data->maxlen);
	}
	else {
		BLI_strncpy(data->str, str, data->maxlen);
	}
}


static bool ui_textedit_delete_selection(uiBut *but, uiHandleButtonData *data)
{
	char *str = data->str;
	const int len = strlen(str);
	bool changed = false;
	if (but->selsta != but->selend && len) {
		memmove(str + but->selsta, str + but->selend, (len - but->selend) + 1);
		changed = true;
	}

	but->pos = but->selend = but->selsta;
	return changed;
}

/**
 * \param x: Screen space cursor location - #wmEvent.x
 *
 * \note ``but->block->aspect`` is used here, so drawing button style is getting scaled too.
 */
static void ui_textedit_set_cursor_pos(uiBut *but, uiHandleButtonData *data, const float x)
{
	uiStyle *style = UI_style_get();  // XXX pass on as arg
	uiFontStyle *fstyle = &style->widget;
	const float aspect = but->block->aspect;
	const short fstyle_points_prev = fstyle->points;

	float startx = but->rect.xmin;
	float starty_dummy = 0.0f;
	char password_str[UI_MAX_PASSWORD_STR];
	/* treat 'str_last' as null terminator for str, no need to modify in-place */
	const char *str = but->editstr, *str_last;

	ui_block_to_window_fl(data->region, but->block, &startx, &starty_dummy);

	ui_fontscale(&fstyle->points, aspect);

	UI_fontstyle_set(fstyle);

	if (fstyle->kerning == 1) /* for BLF_width */
		BLF_enable(fstyle->uifont_id, BLF_KERNING_DEFAULT);

	ui_but_text_password_hide(password_str, but, false);

	if (ELEM(but->type, UI_BTYPE_TEXT, UI_BTYPE_SEARCH_MENU)) {
		if (but->flag & UI_HAS_ICON) {
			startx += UI_DPI_ICON_SIZE / aspect;
		}
	}
	/* but this extra .05 makes clicks inbetween characters feel nicer */
	startx += ((UI_TEXT_MARGIN_X + 0.05f) * U.widget_unit) / aspect;

	/* mouse dragged outside the widget to the left */
	if (x < startx) {
		int i = but->ofs;

		str_last = &str[but->ofs];

		while (i > 0) {
			if (BLI_str_cursor_step_prev_utf8(str, but->ofs, &i)) {
				/* 0.25 == scale factor for less sensitivity */
				if (BLF_width(fstyle->uifont_id, str + i, (str_last - str) - i) > (startx - x) * 0.25f) {
					break;
				}
			}
			else {
				break; /* unlikely but possible */
			}
		}
		but->ofs = i;
		but->pos = but->ofs;
	}
	/* mouse inside the widget, mouse coords mapped in widget space */
	else {  /* (x >= startx) */
		int pos_i;

		/* keep track of previous distance from the cursor to the char */
		float cdist, cdist_prev = 0.0f;
		short pos_prev;

		str_last = &str[strlen(str)];

		but->pos = pos_prev = ((str_last - str) - but->ofs);

		while (true) {
			cdist = startx + BLF_width(fstyle->uifont_id, str + but->ofs, (str_last - str) - but->ofs);

			/* check if position is found */
			if (cdist < x) {
				/* check is previous location was in fact closer */
				if ((x - cdist) > (cdist_prev - x)) {
					but->pos = pos_prev;
				}
				break;
			}
			cdist_prev = cdist;
			pos_prev   = but->pos;
			/* done with tricky distance checks */

			pos_i = but->pos;
			if (but->pos <= 0) break;
			if (BLI_str_cursor_step_prev_utf8(str, but->ofs, &pos_i)) {
				but->pos = pos_i;
				str_last = &str[but->pos + but->ofs];
			}
			else {
				break; /* unlikely but possible */
			}
		}
		but->pos += but->ofs;
		if (but->pos < 0) but->pos = 0;
	}

	if (fstyle->kerning == 1)
		BLF_disable(fstyle->uifont_id, BLF_KERNING_DEFAULT);

	ui_but_text_password_hide(password_str, but, true);

	fstyle->points = fstyle_points_prev;
}

static void ui_textedit_set_cursor_select(uiBut *but, uiHandleButtonData *data, const float x)
{
	if      (x > data->selstartx) data->selextend = EXTEND_RIGHT;
	else if (x < data->selstartx) data->selextend = EXTEND_LEFT;

	ui_textedit_set_cursor_pos(but, data, x);

	if      (data->selextend == EXTEND_RIGHT) but->selend = but->pos;
	else if (data->selextend == EXTEND_LEFT)  but->selsta = but->pos;

	ui_but_update(but);
}

/**
 * This is used for both utf8 and ascii
 *
 * For unicode buttons, \a buf is treated as unicode.
 */
static bool ui_textedit_insert_buf(
        uiBut *but, uiHandleButtonData *data,
        const char *buf, int buf_len)
{
	int len = strlen(data->str);
	int len_new = len - (but->selend - but->selsta) + 1;
	bool changed = false;

	if (data->is_str_dynamic) {
		ui_textedit_string_ensure_max_length(but, data, len_new + buf_len);
	}

	if (len_new <= data->maxlen) {
		char *str = data->str;
		size_t step = buf_len;

		/* type over the current selection */
		if ((but->selend - but->selsta) > 0) {
			changed = ui_textedit_delete_selection(but, data);
			len = strlen(str);
		}

		if ((len + step >= data->maxlen) && (data->maxlen - (len + 1) > 0)) {
			if (ui_but_is_utf8(but)) {
				/* shorten 'step' to a utf8 aligned size that fits  */
				BLI_strnlen_utf8_ex(buf, data->maxlen - (len + 1), &step);
			}
			else {
				step = data->maxlen - (len + 1);
			}
		}

		if (step && (len + step < data->maxlen)) {
			memmove(&str[but->pos + step], &str[but->pos], (len + 1) - but->pos);
			memcpy(&str[but->pos], buf, step * sizeof(char));
			but->pos += step;
			changed = true;
		}
	}

	return changed;
}

static bool ui_textedit_insert_ascii(uiBut *but, uiHandleButtonData *data, char ascii)
{
	char buf[2] = {ascii, '\0'};

	if (ui_but_is_utf8(but) && (BLI_str_utf8_size(buf) == -1)) {
		printf("%s: entering invalid ascii char into an ascii key (%d)\n",
		       __func__, (int)(unsigned char)ascii);

		return false;
	}

	/* in some cases we want to allow invalid utf8 chars */
	return ui_textedit_insert_buf(but, data, buf, 1);
}

static void ui_textedit_move(
        uiBut *but, uiHandleButtonData *data, eStrCursorJumpDirection direction,
        const bool select, eStrCursorJumpType jump)
{
	const char *str = data->str;
	const int len = strlen(str);
	const int pos_prev = but->pos;
	const bool has_sel = (but->selend - but->selsta) > 0;

	ui_but_update(but);

	/* special case, quit selection and set cursor */
	if (has_sel && !select) {
		if (jump == STRCUR_JUMP_ALL) {
			but->selsta = but->selend = but->pos = direction ? len : 0;
		}
		else {
			if (direction) {
				but->selsta = but->pos = but->selend;
			}
			else {
				but->pos = but->selend = but->selsta;
			}
		}
		data->selextend = EXTEND_NONE;
	}
	else {
		int pos_i = but->pos;
		BLI_str_cursor_step_utf8(str, len, &pos_i, direction, jump, true);
		but->pos = pos_i;

		if (select) {
			/* existing selection */
			if (has_sel) {

				if (data->selextend == EXTEND_NONE) {
					data->selextend = EXTEND_RIGHT;
				}

				if (direction) {
					if (data->selextend == EXTEND_RIGHT) {
						but->selend = but->pos;
					}
					else {
						but->selsta = but->pos;
					}
				}
				else {
					if (data->selextend == EXTEND_LEFT) {
						but->selsta = but->pos;
					}
					else {
						but->selend = but->pos;
					}
				}

				if (but->selend < but->selsta) {
					SWAP(short, but->selsta, but->selend);
					data->selextend = (data->selextend == EXTEND_RIGHT) ? EXTEND_LEFT : EXTEND_RIGHT;
				}

			} /* new selection */
			else {
				if (direction) {
					data->selextend = EXTEND_RIGHT;
					but->selend = but->pos;
					but->selsta = pos_prev;
				}
				else {
					data->selextend = EXTEND_LEFT;
					but->selend = pos_prev;
					but->selsta = but->pos;
				}
			}
		}
	}
}

static bool ui_textedit_delete(uiBut *but, uiHandleButtonData *data, int direction, eStrCursorJumpType jump)
{
	char *str = data->str;
	const int len = strlen(str);

	bool changed = false;

	if (jump == STRCUR_JUMP_ALL) {
		if (len) changed = true;
		str[0] = '\0';
		but->pos = 0;
	}
	else if (direction) { /* delete */
		if ((but->selend - but->selsta) > 0) {
			changed = ui_textedit_delete_selection(but, data);
		}
		else if (but->pos >= 0 && but->pos < len) {
			int pos = but->pos;
			int step;
			BLI_str_cursor_step_utf8(str, len, &pos, direction, jump, true);
			step = pos - but->pos;
			memmove(&str[but->pos], &str[but->pos + step], (len + 1) - (but->pos + step));
			changed = true;
		}
	}
	else { /* backspace */
		if (len != 0) {
			if ((but->selend - but->selsta) > 0) {
				changed = ui_textedit_delete_selection(but, data);
			}
			else if (but->pos > 0) {
				int pos = but->pos;
				int step;

				BLI_str_cursor_step_utf8(str, len, &pos, direction, jump, true);
				step = but->pos - pos;
				memmove(&str[but->pos - step], &str[but->pos], (len + 1) - but->pos);
				but->pos -= step;
				changed = true;
			}
		}
	}

	return changed;
}

static int ui_textedit_autocomplete(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	char *str;
	int changed;

	str = data->str;

	if (data->searchbox)
		changed = ui_searchbox_autocomplete(C, data->searchbox, but, data->str);
	else
		changed = but->autocomplete_func(C, str, but->autofunc_arg);

	but->pos = strlen(str);
	but->selsta = but->selend = but->pos;

	return changed;
}

/* mode for ui_textedit_copypaste() */
enum {
	UI_TEXTEDIT_PASTE = 1,
	UI_TEXTEDIT_COPY,
	UI_TEXTEDIT_CUT
};

static bool ui_textedit_copypaste(uiBut *but, uiHandleButtonData *data, const int mode)
{
	char *pbuf;
	bool changed = false;
	int buf_len;

	/* paste */
	if (mode == UI_TEXTEDIT_PASTE) {
		/* extract the first line from the clipboard */
		pbuf = WM_clipboard_text_get_firstline(false, &buf_len);

		if (pbuf) {
			if (ui_but_is_utf8(but)) {
				buf_len -= BLI_utf8_invalid_strip(pbuf, (size_t)buf_len);
			}

			ui_textedit_insert_buf(but, data, pbuf, buf_len);

			changed = true;

			MEM_freeN(pbuf);
		}
	}
	/* cut & copy */
	else if (ELEM(mode, UI_TEXTEDIT_COPY, UI_TEXTEDIT_CUT)) {
		/* copy the contents to the copypaste buffer */
		int sellen = but->selend - but->selsta;
		char *buf = MEM_mallocN(sizeof(char) * (sellen + 1), "ui_textedit_copypaste");

		BLI_strncpy(buf, data->str + but->selsta, sellen + 1);
		WM_clipboard_text_set(buf, 0);
		MEM_freeN(buf);

		/* for cut only, delete the selection afterwards */
		if (mode == UI_TEXTEDIT_CUT) {
			if ((but->selend - but->selsta) > 0) {
				changed = ui_textedit_delete_selection(but, data);
			}
		}
	}

	return changed;
}

#ifdef WITH_INPUT_IME
/* enable ime, and set up uibut ime data */
static void ui_textedit_ime_begin(wmWindow *win, uiBut *UNUSED(but))
{
	/* XXX Is this really needed? */
	int x, y;

	BLI_assert(win->ime_data == NULL);

	/* enable IME and position to cursor, it's a trick */
	x = win->eventstate->x;
	/* flip y and move down a bit, prevent the IME panel cover the edit button */
	y = win->eventstate->y - 12;

	wm_window_IME_begin(win, x, y, 0, 0, true);
}

/* disable ime, and clear uibut ime data */
static void ui_textedit_ime_end(wmWindow *win, uiBut *UNUSED(but))
{
	wm_window_IME_end(win);
}

void ui_but_ime_reposition(uiBut *but, int x, int y, bool complete)
{
	BLI_assert(but->active);

	ui_region_to_window(but->active->region, &x, &y);
	wm_window_IME_begin(but->active->window, x, y - 4, 0, 0, complete);
}

wmIMEData *ui_but_ime_data_get(uiBut *but)
{
	if (but->active && but->active->window) {
		return but->active->window->ime_data;
	}
	else {
		return NULL;
	}
}
#endif  /* WITH_INPUT_IME */

static void ui_textedit_begin(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	wmWindow *win = CTX_wm_window(C);
	int len;
	const bool is_num_but = ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER);
	bool no_zero_strip = false;

	if (data->str) {
		MEM_freeN(data->str);
		data->str = NULL;
	}

#ifdef USE_DRAG_MULTINUM
	/* this can happen from multi-drag */
	if (data->applied_interactive) {
		/* remove any small changes so canceling edit doesn't restore invalid value: T40538 */
		data->cancel = true;
		ui_apply_but(C, but->block, but, data, true);
		data->cancel = false;

		data->applied_interactive = false;
	}
#endif

#ifdef USE_ALLSELECT
	if (is_num_but) {
		if (IS_ALLSELECT_EVENT(win->eventstate)) {
			data->select_others.is_enabled = true;
			data->select_others.is_copy = true;

		}
	}
#endif

	/* retrieve string */
	data->maxlen = ui_but_string_get_max_length(but);
	if (data->maxlen != 0) {
		data->str = MEM_callocN(sizeof(char) * data->maxlen, "textedit str");
		/* We do not want to truncate precision to default here, it's nice to show value,
		 * not to edit it - way too much precision is lost then. */
		ui_but_string_get_ex(but, data->str, data->maxlen, UI_PRECISION_FLOAT_MAX, true, &no_zero_strip);
	}
	else {
		data->is_str_dynamic = true;
		data->str = ui_but_string_get_dynamic(but, &data->maxlen);
	}

	if (ui_but_is_float(but) && !ui_but_is_unit(but) && !ui_but_anim_expression_get(but, NULL, 0) && !no_zero_strip) {
		BLI_str_rstrip_float_zero(data->str, '\0');
	}

	if (is_num_but) {
		BLI_assert(data->is_str_dynamic == false);
		ui_but_convert_to_unit_alt_name(but, data->str, data->maxlen);
	}

	/* won't change from now on */
	len = strlen(data->str);

	data->origstr = BLI_strdupn(data->str, len);
	data->selextend = EXTEND_NONE;
	data->selstartx = 0.0f;

	/* set cursor pos to the end of the text */
	but->editstr = data->str;
	but->pos = len;
	but->selsta = 0;
	but->selend = len;

	/* optional searchbox */
	if (but->type ==  UI_BTYPE_SEARCH_MENU) {
		data->searchbox = but->search_create_func(C, data->region, but);
		ui_searchbox_update(C, data->searchbox, but, true); /* true = reset */
	}

	/* reset alert flag (avoid confusion, will refresh on exit) */
	but->flag &= ~UI_BUT_REDALERT;

	ui_but_update(but);

	WM_cursor_modal_set(win, BC_TEXTEDITCURSOR);

#ifdef WITH_INPUT_IME
	if (is_num_but == false && BLT_lang_is_ime_supported()) {
		ui_textedit_ime_begin(win, but);
	}
#endif
}

static void ui_textedit_end(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	wmWindow *win = CTX_wm_window(C);

	if (but) {
		if (ui_but_is_utf8(but)) {
			int strip = BLI_utf8_invalid_strip(but->editstr, strlen(but->editstr));
			/* not a file?, strip non utf-8 chars */
			if (strip) {
				/* wont happen often so isn't that annoying to keep it here for a while */
				printf("%s: invalid utf8 - stripped chars %d\n", __func__, strip);
			}
		}

		if (data->searchbox) {
			if (data->cancel == false) {
				if ((ui_searchbox_apply(but, data->searchbox) == false) &&
				    (ui_searchbox_find_index(data->searchbox, but->editstr) == -1))
				{
					data->cancel = true;

					/* ensure menu (popup) too is closed! */
					data->escapecancel = true;
				}
			}

			ui_searchbox_free(C, data->searchbox);
			data->searchbox = NULL;
			if (but->free_search_arg) {
				MEM_SAFE_FREE(but->search_arg);
			}
		}

		but->editstr = NULL;
		but->pos = -1;
	}

	WM_cursor_modal_restore(win);

#ifdef WITH_INPUT_IME
	if (win->ime_data) {
		ui_textedit_ime_end(win, but);
	}
#endif
}

static void ui_textedit_next_but(uiBlock *block, uiBut *actbut, uiHandleButtonData *data)
{
	uiBut *but;

	/* label and roundbox can overlap real buttons (backdrops...) */
	if (ELEM(actbut->type, UI_BTYPE_LABEL, UI_BTYPE_SEPR, UI_BTYPE_SEPR_LINE, UI_BTYPE_ROUNDBOX, UI_BTYPE_LISTBOX))
		return;

	for (but = actbut->next; but; but = but->next) {
		if (ui_but_is_editable_as_text(but)) {
			if (!(but->flag & UI_BUT_DISABLED)) {
				data->postbut = but;
				data->posttype = BUTTON_ACTIVATE_TEXT_EDITING;
				return;
			}
		}
	}
	for (but = block->buttons.first; but != actbut; but = but->next) {
		if (ui_but_is_editable_as_text(but)) {
			if (!(but->flag & UI_BUT_DISABLED)) {
				data->postbut = but;
				data->posttype = BUTTON_ACTIVATE_TEXT_EDITING;
				return;
			}
		}
	}
}

static void ui_textedit_prev_but(uiBlock *block, uiBut *actbut, uiHandleButtonData *data)
{
	uiBut *but;

	/* label and roundbox can overlap real buttons (backdrops...) */
	if (ELEM(actbut->type, UI_BTYPE_LABEL, UI_BTYPE_SEPR, UI_BTYPE_SEPR_LINE, UI_BTYPE_ROUNDBOX, UI_BTYPE_LISTBOX))
		return;

	for (but = actbut->prev; but; but = but->prev) {
		if (ui_but_is_editable_as_text(but)) {
			if (!(but->flag & UI_BUT_DISABLED)) {
				data->postbut = but;
				data->posttype = BUTTON_ACTIVATE_TEXT_EDITING;
				return;
			}
		}
	}
	for (but = block->buttons.last; but != actbut; but = but->prev) {
		if (ui_but_is_editable_as_text(but)) {
			if (!(but->flag & UI_BUT_DISABLED)) {
				data->postbut = but;
				data->posttype = BUTTON_ACTIVATE_TEXT_EDITING;
				return;
			}
		}
	}
}


static void ui_do_but_textedit(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int retval = WM_UI_HANDLER_CONTINUE;
	bool changed = false, inbox = false, update = false;

#ifdef WITH_INPUT_IME
	wmWindow *win = CTX_wm_window(C);
	wmIMEData *ime_data = win->ime_data;
	bool is_ime_composing = ime_data && ime_data->is_ime_composing;
#else
	bool is_ime_composing = false;
#endif

	switch (event->type) {
		case MOUSEMOVE:
		case MOUSEPAN:
			if (data->searchbox) {
#ifdef USE_KEYNAV_LIMIT
				if ((event->type == MOUSEMOVE) && ui_mouse_motion_keynav_test(&data->searchbox_keynav_state, event)) {
					/* pass */
				}
				else {
					ui_searchbox_event(C, data->searchbox, but, event);
				}
#else
				ui_searchbox_event(C, data->searchbox, but, event);
#endif
			}

			break;
		case RIGHTMOUSE:
		case ESCKEY:
			if (event->val == KM_PRESS) {
#ifdef WITH_INPUT_IME
				/* skips button handling since it is not wanted */
				if (is_ime_composing) {
					break;
				}
#endif
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				retval = WM_UI_HANDLER_BREAK;
			}
			break;
		case LEFTMOUSE:
		{
			bool had_selection = but->selsta != but->selend;

			/* exit on LMB only on RELEASE for searchbox, to mimic other popups, and allow multiple menu levels */
			if (data->searchbox)
				inbox = ui_searchbox_inside(data->searchbox, event->x, event->y);

			/* for double click: we do a press again for when you first click on button
			 * (selects all text, no cursor pos) */
			if (event->val == KM_PRESS || event->val == KM_DBL_CLICK) {
				float mx, my;

				mx = event->x;
				my = event->y;
				ui_window_to_block_fl(data->region, block, &mx, &my);

				if (ui_but_contains_pt(but, mx, my)) {
					ui_textedit_set_cursor_pos(but, data, event->x);
					but->selsta = but->selend = but->pos;
					data->selstartx = event->x;

					button_activate_state(C, but, BUTTON_STATE_TEXT_SELECTING);
					retval = WM_UI_HANDLER_BREAK;
				}
				else if (inbox == false) {
					/* if searchbox, click outside will cancel */
					if (data->searchbox)
						data->cancel = data->escapecancel = true;
					button_activate_state(C, but, BUTTON_STATE_EXIT);
					retval = WM_UI_HANDLER_BREAK;
				}
			}

			/* only select a word in button if there was no selection before */
			if (event->val == KM_DBL_CLICK && had_selection == false) {
				ui_textedit_move(but, data, STRCUR_DIR_PREV, false, STRCUR_JUMP_DELIM);
				ui_textedit_move(but, data, STRCUR_DIR_NEXT, true, STRCUR_JUMP_DELIM);
				retval = WM_UI_HANDLER_BREAK;
				changed = true;
			}
			else if (inbox) {
				/* if we allow activation on key press, it gives problems launching operators [#35713] */
				if (event->val == KM_RELEASE) {
					button_activate_state(C, but, BUTTON_STATE_EXIT);
					retval = WM_UI_HANDLER_BREAK;
				}
			}
			break;
		}
	}

	if (event->val == KM_PRESS && !is_ime_composing) {
		switch (event->type) {
			case VKEY:
			case XKEY:
			case CKEY:
				if (IS_EVENT_MOD(event, ctrl, oskey)) {
					if (event->type == VKEY)
						changed = ui_textedit_copypaste(but, data, UI_TEXTEDIT_PASTE);
					else if (event->type == CKEY)
						changed = ui_textedit_copypaste(but, data, UI_TEXTEDIT_COPY);
					else if (event->type == XKEY)
						changed = ui_textedit_copypaste(but, data, UI_TEXTEDIT_CUT);

					retval = WM_UI_HANDLER_BREAK;
				}
				break;
			case RIGHTARROWKEY:
				ui_textedit_move(
				        but, data, STRCUR_DIR_NEXT,
				        event->shift != 0, event->ctrl ? STRCUR_JUMP_DELIM : STRCUR_JUMP_NONE);
				retval = WM_UI_HANDLER_BREAK;
				break;
			case LEFTARROWKEY:
				ui_textedit_move(
				        but, data, STRCUR_DIR_PREV,
				        event->shift != 0, event->ctrl ? STRCUR_JUMP_DELIM : STRCUR_JUMP_NONE);
				retval = WM_UI_HANDLER_BREAK;
				break;
			case WHEELDOWNMOUSE:
			case DOWNARROWKEY:
				if (data->searchbox) {
#ifdef USE_KEYNAV_LIMIT
					ui_mouse_motion_keynav_init(&data->searchbox_keynav_state, event);
#endif
					ui_searchbox_event(C, data->searchbox, but, event);
					break;
				}
				if (event->type == WHEELDOWNMOUSE) {
					break;
				}
				ATTR_FALLTHROUGH;
			case ENDKEY:
				ui_textedit_move(
				        but, data, STRCUR_DIR_NEXT,
				        event->shift != 0, STRCUR_JUMP_ALL);
				retval = WM_UI_HANDLER_BREAK;
				break;
			case WHEELUPMOUSE:
			case UPARROWKEY:
				if (data->searchbox) {
#ifdef USE_KEYNAV_LIMIT
					ui_mouse_motion_keynav_init(&data->searchbox_keynav_state, event);
#endif
					ui_searchbox_event(C, data->searchbox, but, event);
					break;
				}
				if (event->type == WHEELUPMOUSE) {
					break;
				}
				ATTR_FALLTHROUGH;
			case HOMEKEY:
				ui_textedit_move(
				        but, data, STRCUR_DIR_PREV,
				        event->shift != 0, STRCUR_JUMP_ALL);
				retval = WM_UI_HANDLER_BREAK;
				break;
			case PADENTER:
			case RETKEY:
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				retval = WM_UI_HANDLER_BREAK;
				break;
			case DELKEY:
				changed = ui_textedit_delete(
				        but, data, 1,
				        event->ctrl ? STRCUR_JUMP_DELIM : STRCUR_JUMP_NONE);
				retval = WM_UI_HANDLER_BREAK;
				break;

			case BACKSPACEKEY:
				changed = ui_textedit_delete(
				        but, data, 0,
				        event->ctrl ? STRCUR_JUMP_DELIM : STRCUR_JUMP_NONE);
				retval = WM_UI_HANDLER_BREAK;
				break;

			case AKEY:

				/* Ctrl + A: Select all */
#if defined(__APPLE__)
				/* OSX uses cmd-a systemwide, so add it */
				if ((event->oskey && !IS_EVENT_MOD(event, shift, alt, ctrl)) ||
				    (event->ctrl && !IS_EVENT_MOD(event, shift, alt, oskey)))
#else
				if (event->ctrl && !IS_EVENT_MOD(event, shift, alt, oskey))
#endif
				{
					ui_textedit_move(
					        but, data, STRCUR_DIR_PREV,
					        false, STRCUR_JUMP_ALL);
					ui_textedit_move(
					        but, data, STRCUR_DIR_NEXT,
					        true, STRCUR_JUMP_ALL);
					retval = WM_UI_HANDLER_BREAK;
				}
				break;

			case TABKEY:
				/* there is a key conflict here, we can't tab with autocomplete */
				if (but->autocomplete_func || data->searchbox) {
					int autocomplete = ui_textedit_autocomplete(C, but, data);
					changed = autocomplete != AUTOCOMPLETE_NO_MATCH;

					if (autocomplete == AUTOCOMPLETE_FULL_MATCH)
						button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				/* the hotkey here is not well defined, was G.qual so we check all */
				else if (IS_EVENT_MOD(event, shift, ctrl, alt, oskey)) {
					ui_textedit_prev_but(block, but, data);
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				else {
					ui_textedit_next_but(block, but, data);
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				retval = WM_UI_HANDLER_BREAK;
				break;
		}

		if ((event->ascii || event->utf8_buf[0]) &&
		    (retval == WM_UI_HANDLER_CONTINUE)
#ifdef WITH_INPUT_IME
		    &&
		    !is_ime_composing &&
		    (!WM_event_is_ime_switch(event) || !BLT_lang_is_ime_supported())
#endif
		    )
		{
			char ascii = event->ascii;
			const char *utf8_buf = event->utf8_buf;

			/* exception that's useful for number buttons, some keyboard
			 * numpads have a comma instead of a period */
			if (ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER)) { /* could use data->min*/
				if (event->type == PADPERIOD && ascii == ',') {
					ascii = '.';
					utf8_buf = NULL; /* force ascii fallback */
				}
			}

			if (utf8_buf && utf8_buf[0]) {
				int utf8_buf_len = BLI_str_utf8_size(utf8_buf);
				/* keep this printf until utf8 is well tested */
				if (utf8_buf_len != 1) {
					printf("%s: utf8 char '%.*s'\n", __func__, utf8_buf_len, utf8_buf);
				}

				// strcpy(utf8_buf, "12345");
				changed = ui_textedit_insert_buf(but, data, event->utf8_buf, utf8_buf_len);
			}
			else {
				changed = ui_textedit_insert_ascii(but, data, ascii);
			}

			retval = WM_UI_HANDLER_BREAK;

		}
		/* textbutton with this flag: do live update (e.g. for search buttons) */
		if (but->flag & UI_BUT_TEXTEDIT_UPDATE) {
			update = true;
		}
	}

#ifdef WITH_INPUT_IME
	if (event->type == WM_IME_COMPOSITE_START || event->type == WM_IME_COMPOSITE_EVENT) {
		changed = true;

		if (event->type == WM_IME_COMPOSITE_START && but->selend > but->selsta) {
			ui_textedit_delete_selection(but, data);
		}
		if (event->type == WM_IME_COMPOSITE_EVENT && ime_data->result_len) {
			ui_textedit_insert_buf(
			        but, data,
			        ime_data->str_result,
			        ime_data->result_len);
		}
	}
	else if (event->type == WM_IME_COMPOSITE_END) {
		changed = true;
	}
#endif

	if (changed) {
		/* only do live update when but flag request it (UI_BUT_TEXTEDIT_UPDATE). */
		if (update && data->interactive) {
			ui_apply_but(C, block, but, data, true);
		}
		else {
			ui_but_update_edited(but);
		}
		but->changed = true;

		if (data->searchbox)
			ui_searchbox_update(C, data->searchbox, but, true);  /* true = reset */
	}

	if (changed || (retval == WM_UI_HANDLER_BREAK))
		ED_region_tag_redraw(data->region);
}

static void ui_do_but_textedit_select(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my, retval = WM_UI_HANDLER_CONTINUE;

	switch (event->type) {
		case MOUSEMOVE:
		{
			mx = event->x;
			my = event->y;
			ui_window_to_block(data->region, block, &mx, &my);

			ui_textedit_set_cursor_select(but, data, event->x);
			retval = WM_UI_HANDLER_BREAK;
			break;
		}
		case LEFTMOUSE:
			if (event->val == KM_RELEASE)
				button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
			retval = WM_UI_HANDLER_BREAK;
			break;
	}

	if (retval == WM_UI_HANDLER_BREAK) {
		ui_but_update(but);
		ED_region_tag_redraw(data->region);
	}
}

/* ************* number editing for various types ************* */

static void ui_numedit_begin(uiBut *but, uiHandleButtonData *data)
{
	if (but->type == UI_BTYPE_CURVE) {
		but->editcumap = (CurveMapping *)but->poin;
	}
	else if (but->type == UI_BTYPE_COLORBAND) {
		data->coba = (ColorBand *)but->poin;
		but->editcoba = data->coba;
	}
	else if (ELEM(but->type, UI_BTYPE_UNITVEC, UI_BTYPE_HSVCUBE, UI_BTYPE_HSVCIRCLE, UI_BTYPE_COLOR)) {
		ui_but_v3_get(but, data->origvec);
		copy_v3_v3(data->vec, data->origvec);
		but->editvec = data->vec;
	}
	else {
		float softrange, softmin, softmax;

		data->startvalue = ui_but_value_get(but);
		data->origvalue = data->startvalue;
		data->value = data->origvalue;
		but->editval = &data->value;

		softmin = but->softmin;
		softmax = but->softmax;
		softrange = softmax - softmin;

		data->dragfstart = (softrange == 0.0f) ? 0.0f : ((float)data->value - softmin) / softrange;
		data->dragf = data->dragfstart;
	}

	data->dragchange = false;
	data->draglock = true;
}

static void ui_numedit_end(uiBut *but, uiHandleButtonData *data)
{
	but->editval = NULL;
	but->editvec = NULL;
	but->editcoba = NULL;
	but->editcumap = NULL;

	data->dragstartx = 0;
	data->draglastx = 0;
	data->dragchange = false;
	data->dragcbd = NULL;
	data->dragsel = 0;
}

static void ui_numedit_apply(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data)
{
	if (data->interactive) {
		ui_apply_but(C, block, but, data, true);
	}
	else {
		ui_but_update(but);
	}

	ED_region_tag_redraw(data->region);
}

/* ****************** menu opening for various types **************** */

static void ui_block_open_begin(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	uiBlockCreateFunc func = NULL;
	uiBlockHandleCreateFunc handlefunc = NULL;
	uiMenuCreateFunc menufunc = NULL;
	uiMenuCreateFunc popoverfunc = NULL;
	void *arg = NULL;

	switch (but->type) {
		case UI_BTYPE_BLOCK:
		case UI_BTYPE_PULLDOWN:
			if (but->menu_create_func) {
				menufunc = but->menu_create_func;
				arg = but->poin;
			}
			else {
				func = but->block_create_func;
				arg = but->poin ? but->poin : but->func_argN;
			}
			break;
		case UI_BTYPE_MENU:
			BLI_assert(but->menu_create_func);
			menufunc = but->menu_create_func;
			arg = but->poin;
			break;
		case UI_BTYPE_POPOVER:
			BLI_assert(but->menu_create_func);
			popoverfunc = but->menu_create_func;
			arg = but->poin;
			break;
		case UI_BTYPE_COLOR:
			ui_but_v3_get(but, data->origvec);
			copy_v3_v3(data->vec, data->origvec);
			but->editvec = data->vec;

			handlefunc = ui_block_func_COLOR;
			arg = but;
			break;

			/* quiet warnings for unhandled types */
		default:
			break;
	}

	if (func || handlefunc) {
		data->menu = ui_popup_block_create(C, data->region, but, func, handlefunc, arg);
		if (but->block->handle)
			data->menu->popup = but->block->handle->popup;
	}
	else if (menufunc) {
		data->menu = ui_popup_menu_create(C, data->region, but, menufunc, arg);
		if (but->block->handle)
			data->menu->popup = but->block->handle->popup;
	}
	else if (popoverfunc) {
		data->menu = ui_popover_panel_create(C, data->region, but, popoverfunc, arg);
		if (but->block->handle)
			data->menu->popup = but->block->handle->popup;
	}

#ifdef USE_ALLSELECT
	{
		wmWindow *win = CTX_wm_window(C);
		if (IS_ALLSELECT_EVENT(win->eventstate)) {
			data->select_others.is_enabled = true;
		}
	}
#endif

	/* this makes adjacent blocks auto open from now on */
	//if (but->block->auto_open == 0) but->block->auto_open = 1;
}

static void ui_block_open_end(bContext *C, uiBut *but, uiHandleButtonData *data)
{
	if (but) {
		but->editval = NULL;
		but->editvec = NULL;

		but->block->auto_open_last = PIL_check_seconds_timer();
	}

	if (data->menu) {
		ui_popup_block_free(C, data->menu);
		data->menu = NULL;
	}
}

int ui_but_menu_direction(uiBut *but)
{
	uiHandleButtonData *data = but->active;

	if (data && data->menu)
		return data->menu->direction;

	return 0;
}

/**
 * Hack for #uiList #UI_BTYPE_LISTROW buttons to "give" events to overlaying #UI_BTYPE_TEXT buttons
 * (Ctrl-Click rename feature & co).
 */
static uiBut *ui_but_list_row_text_activate(
        bContext *C, uiBut *but, uiHandleButtonData *data, const wmEvent *event,
        uiButtonActivateType activate_type)
{
	ARegion *ar = CTX_wm_region(C);
	uiBut *labelbut = ui_but_find_mouse_over_ex(ar, event->x, event->y, true);

	if (labelbut && labelbut->type == UI_BTYPE_TEXT && !(labelbut->flag & UI_BUT_DISABLED)) {
		/* exit listrow */
		data->cancel = true;
		button_activate_exit(C, but, data, false, false);

		/* Activate the text button. */
		button_activate_init(C, ar, labelbut, activate_type);

		return labelbut;
	}
	return NULL;
}

/* ***************** events for different button types *************** */

#ifdef USE_DRAG_TOGGLE
/* Shared by any button that supports drag-toggle. */
static bool ui_do_but_ANY_drag_toggle(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event,
        int *r_retval)
{
	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS && ui_but_is_drag_toggle(but)) {
#if 0		/* UNUSED */
			data->togdual = event->ctrl;
			data->togonly = !event->shift;
#endif
			ui_apply_but(C, but->block, but, data, true);
			button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
			data->dragstartx = event->x;
			data->dragstarty = event->y;
			*r_retval = WM_UI_HANDLER_BREAK;
			return true;
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_DRAG) {
		/* note: the 'BUTTON_STATE_WAIT_DRAG' part of 'ui_do_but_EXIT' could be refactored into its own function */
		data->applied = false;
		*r_retval = ui_do_but_EXIT(C, but, data, event);
		return true;
	}
	return false;
}
#endif  /* USE_DRAG_TOGGLE */

static int ui_do_but_BUT(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
#ifdef USE_DRAG_TOGGLE
	{
		int retval;
		if (ui_do_but_ANY_drag_toggle(C, but, data, event, &retval)) {
			return retval;
		}
	}
#endif

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			button_activate_state(C, but, BUTTON_STATE_WAIT_RELEASE);
			return WM_UI_HANDLER_BREAK;
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE && but->block->handle) {
			/* regular buttons will be 'UI_SELECT', menu items 'UI_ACTIVE' */
			if (!(but->flag & (UI_SELECT | UI_ACTIVE)))
				data->cancel = true;
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_BREAK;
		}
		else if (ELEM(event->type, PADENTER, RETKEY) && event->val == KM_PRESS) {
			button_activate_state(C, but, BUTTON_STATE_WAIT_FLASH);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_RELEASE) {
		if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			if (!(but->flag & UI_SELECT))
				data->cancel = true;
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_BREAK;
		}
	}

	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_HOTKEYEVT(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS) {
			but->drawstr[0] = 0;
			but->modifier_key = 0;
			button_activate_state(C, but, BUTTON_STATE_WAIT_KEY_EVENT);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_KEY_EVENT) {
		if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
			return WM_UI_HANDLER_CONTINUE;
		}

		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			/* only cancel if click outside the button */
			if (ui_but_contains_point_px(but->active->region, but, event->x, event->y) == 0) {
				/* data->cancel doesn't work, this button opens immediate */
				if (but->flag & UI_BUT_IMMEDIATE)
					ui_but_value_set(but, 0);
				else
					data->cancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				return WM_UI_HANDLER_BREAK;
			}
		}

		/* always set */
		but->modifier_key = 0;
		if (event->shift) but->modifier_key |= KM_SHIFT;
		if (event->alt) but->modifier_key |= KM_ALT;
		if (event->ctrl) but->modifier_key |= KM_CTRL;
		if (event->oskey) but->modifier_key |= KM_OSKEY;

		ui_but_update(but);
		ED_region_tag_redraw(data->region);

		if (event->val == KM_PRESS) {
			if (ISHOTKEY(event->type) && (event->type != ESCKEY)) {
				if (WM_key_event_string(event->type, false)[0])
					ui_but_value_set(but, event->type);
				else
					data->cancel = true;

				button_activate_state(C, but, BUTTON_STATE_EXIT);
				return WM_UI_HANDLER_BREAK;
			}
			else if (event->type == ESCKEY) {
				if (event->val == KM_PRESS) {
					data->cancel = true;
					data->escapecancel = true;
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
			}

		}
	}

	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_KEYEVT(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS) {
			button_activate_state(C, but, BUTTON_STATE_WAIT_KEY_EVENT);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_KEY_EVENT) {
		if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE)) {
			return WM_UI_HANDLER_CONTINUE;
		}

		if (event->val == KM_PRESS) {
			if (WM_key_event_string(event->type, false)[0])
				ui_but_value_set(but, event->type);
			else
				data->cancel = true;

			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
	}

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_but_is_mouse_over_icon_extra(const ARegion *region, uiBut *but, const int mouse_xy[2])
{
	int x = mouse_xy[0], y = mouse_xy[1];
	rcti icon_rect;

	BLI_assert(ui_but_icon_extra_get(but) != UI_BUT_ICONEXTRA_NONE);

	ui_window_to_block(region, but->block, &x, &y);

	BLI_rcti_rctf_copy(&icon_rect, &but->rect);
	icon_rect.xmin = icon_rect.xmax - (BLI_rcti_size_y(&icon_rect));

	return BLI_rcti_isect_pt(&icon_rect, x, y);
}

static int ui_do_but_TAB(bContext *C, uiBlock *block, uiBut *but, uiHandleButtonData *data, const wmEvent *event)
{
#ifdef USE_DRAG_TOGGLE
	{
		int retval;
		if (ui_do_but_ANY_drag_toggle(C, but, data, event, &retval)) {
			return retval;
		}
	}
#endif

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		const int rna_type = but->rnaprop ? RNA_property_type(but->rnaprop) : 0;

		if (but->rnaprop &&
		    ELEM(rna_type, PROP_POINTER, PROP_STRING) &&
		    (but->custom_data != NULL) &&
		    (event->type == LEFTMOUSE) &&
		    ((event->val == KM_DBL_CLICK) || event->ctrl))
		{
			button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
			return WM_UI_HANDLER_BREAK;
		}
		else if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && (event->val == KM_PRESS)) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_TEXT_EDITING) {
		ui_do_but_textedit(C, block, but, data, event);
		return WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_TEXT_SELECTING) {
		ui_do_but_textedit_select(C, block, but, data, event);
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_TEX(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (ELEM(event->type, LEFTMOUSE, EVT_BUT_OPEN, PADENTER, RETKEY) && event->val == KM_PRESS) {
			if (ELEM(event->type, PADENTER, RETKEY) && (!ui_but_is_utf8(but))) {
				/* pass - allow filesel, enter to execute */
			}
			else if (but->dt == UI_EMBOSS_NONE && !event->ctrl) {
				/* pass */
			}
			else {
				const bool has_icon_extra = ui_but_icon_extra_get(but) == UI_BUT_ICONEXTRA_CLEAR;

				if (has_icon_extra && ui_but_is_mouse_over_icon_extra(data->region, but, &event->x)) {
					ui_but_text_clear(C, but, data);
				}
				else {
					button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
				}
				return WM_UI_HANDLER_BREAK;
			}
		}
	}
	else if (data->state == BUTTON_STATE_TEXT_EDITING) {
		ui_do_but_textedit(C, block, but, data, event);
		return WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_TEXT_SELECTING) {
		ui_do_but_textedit_select(C, block, but, data, event);
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_SEARCH_UNLINK(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	const uiButExtraIconType extra_icon_type = ui_but_icon_extra_get(but);
	const bool has_icon_extra = (extra_icon_type != UI_BUT_ICONEXTRA_NONE);

	/* unlink icon is on right */
	if ((ELEM(event->type, LEFTMOUSE, EVT_BUT_OPEN, PADENTER, RETKEY)) &&
	    (has_icon_extra == true) &&
	    (ui_but_is_mouse_over_icon_extra(data->region, but, &event->x) == true))
	{
		/* doing this on KM_PRESS calls eyedropper after clicking unlink icon */
		if (event->val == KM_RELEASE) {
			/* unlink */
			if (extra_icon_type == UI_BUT_ICONEXTRA_CLEAR) {
				ui_but_text_clear(C, but, data);
			}
			/* eyedropper */
			else if (extra_icon_type == UI_BUT_ICONEXTRA_EYEDROPPER) {
				WM_operator_name_call(C, "UI_OT_eyedropper_id", WM_OP_INVOKE_DEFAULT, NULL);
			}
			else {
				BLI_assert(0);
			}
		}
		return WM_UI_HANDLER_BREAK;
	}
	return ui_do_but_TEX(C, block, but, data, event);
}

static int ui_do_but_TOG(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
#ifdef USE_DRAG_TOGGLE
	{
		int retval;
		if (ui_do_but_ANY_drag_toggle(C, but, data, event, &retval)) {
			return retval;
		}
	}
#endif

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS) {
#if 0		/* UNUSED */
			data->togdual = event->ctrl;
			data->togonly = !event->shift;
#endif
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_BREAK;
		}
		else if (ELEM(event->type, WHEELDOWNMOUSE, WHEELUPMOUSE) && event->ctrl) {
			/* Support alt+wheel on expanded enum rows */
			if (but->type == UI_BTYPE_ROW) {
				const int direction = (event->type == WHEELDOWNMOUSE) ? -1 : 1;
				uiBut *but_select = ui_but_find_select_in_enum(but, direction);
				if (but_select) {
					uiBut *but_other = (direction == -1) ? but_select->next : but_select->prev;
					if (but_other && ui_but_find_select_in_enum__cmp(but, but_other)) {
						ARegion *ar = data->region;

						data->cancel = true;
						button_activate_exit(C, but, data, false, false);

						/* Activate the text button. */
						button_activate_init(C, ar, but_other, BUTTON_ACTIVATE_OVER);
						data = but_other->active;
						if (data) {
							ui_apply_but(C, but->block, but_other, but_other->active, true);
							button_activate_exit(C, but_other, data, false, false);

							/* restore active button */
							button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
						}
						else {
							/* shouldn't happen */
							BLI_assert(0);
						}
					}
				}
				return WM_UI_HANDLER_BREAK;
			}
		}
	}
	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_EXIT(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{

	if (data->state == BUTTON_STATE_HIGHLIGHT) {

		/* first handle click on icondrag type button */
		if (event->type == LEFTMOUSE && but->dragpoin) {
			if (ui_but_contains_point_px_icon(but, data->region, event)) {

				/* tell the button to wait and keep checking further events to
				 * see if it should start dragging */
				button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
				data->dragstartx = event->x;
				data->dragstarty = event->y;
				return WM_UI_HANDLER_CONTINUE;
			}
		}
#ifdef USE_DRAG_TOGGLE
		if (event->type == LEFTMOUSE && ui_but_is_drag_toggle(but)) {
			button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
			data->dragstartx = event->x;
			data->dragstarty = event->y;
			return WM_UI_HANDLER_CONTINUE;
		}
#endif

		if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS) {
			int ret = WM_UI_HANDLER_BREAK;
			/* XXX (a bit ugly) Special case handling for filebrowser drag button */
			if (but->dragpoin && but->imb && ui_but_contains_point_px_icon(but, data->region, event)) {
				ret = WM_UI_HANDLER_CONTINUE;
			}
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return ret;
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_DRAG) {

		/* this function also ends state */
		if (ui_but_drag_init(C, but, data, event)) {
			return WM_UI_HANDLER_BREAK;
		}

		/* If the mouse has been pressed and released, getting to
		 * this point without triggering a drag, then clear the
		 * drag state for this button and continue to pass on the event */
		if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_CONTINUE;
		}

		/* while waiting for a drag to be triggered, always block
		 * other events from getting handled */
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

/* var names match ui_numedit_but_NUM */
static float ui_numedit_apply_snapf(
        uiBut *but, float tempf, float softmin, float softmax, float softrange,
        const enum eSnapType snap)
{
	if (tempf == softmin || tempf == softmax || snap == SNAP_OFF) {
		/* pass */
	}
	else {
		float fac = 1.0f;

		if (ui_but_is_unit(but)) {
			UnitSettings *unit = but->block->unit;
			int unit_type = RNA_SUBTYPE_UNIT_VALUE(UI_but_unit_type_get(but));

			if (bUnit_IsValid(unit->system, unit_type)) {
				fac = (float)bUnit_BaseScalar(unit->system, unit_type);
				if (ELEM(unit_type, B_UNIT_LENGTH, B_UNIT_AREA, B_UNIT_VOLUME)) {
					fac /= unit->scale_length;
				}
			}
		}

		if (fac != 1.0f) {
			/* snap in unit-space */
			tempf /= fac;
			/* softmin /= fac; */ /* UNUSED */
			/* softmax /= fac; */ /* UNUSED */
			softrange /= fac;
		}

		/* workaround, too high snapping values */
		/* snapping by 10's for float buttons is quite annoying (location, scale...),
		 * but allow for rotations */
		if (softrange >= 21.0f) {
			UnitSettings *unit = but->block->unit;
			int unit_type = UI_but_unit_type_get(but);
			if ((unit_type == PROP_UNIT_ROTATION) && (unit->system_rotation != USER_UNIT_ROT_RADIANS)) {
				/* pass (degrees)*/
			}
			else {
				softrange = 20.0f;
			}
		}

		if (snap == SNAP_ON) {
			if      (softrange < 2.10f) tempf = roundf(tempf * 10.0f) * 0.1f;
			else if (softrange < 21.0f) tempf = roundf(tempf);
			else                        tempf = roundf(tempf * 0.1f) * 10.0f;
		}
		else if (snap == SNAP_ON_SMALL) {
			if      (softrange < 2.10f) tempf = roundf(tempf * 100.0f) * 0.01f;
			else if (softrange < 21.0f) tempf = roundf(tempf * 10.0f)  * 0.1f;
			else                        tempf = roundf(tempf);
		}
		else {
			BLI_assert(0);
		}

		if (fac != 1.0f)
			tempf *= fac;
	}

	return tempf;
}

static float ui_numedit_apply_snap(
        int temp, float softmin, float softmax,
        const enum eSnapType snap)
{
	if (temp == softmin || temp == softmax)
		return temp;

	switch (snap) {
		case SNAP_OFF:
			break;
		case SNAP_ON:
			temp = 10 * (temp / 10);
			break;
		case SNAP_ON_SMALL:
			temp = 100 * (temp / 100);
			break;
	}

	return temp;
}

static bool ui_numedit_but_NUM(
        uiBut *but, uiHandleButtonData *data,
        int mx, const bool is_motion,
        const enum eSnapType snap, float fac)
{
	float deler, tempf, softmin, softmax, softrange;
	int lvalue, temp;
	bool changed = false;
	const bool is_float = ui_but_is_float(but);

	/* prevent unwanted drag adjustments, test motion so modifier keys refresh. */
	if ((is_motion || data->draglock) &&
	    (ui_but_dragedit_update_mval(data, mx) == false))
	{
		return changed;
	}

	softmin = but->softmin;
	softmax = but->softmax;
	softrange = softmax - softmin;

	if (ui_but_is_cursor_warp(but)) {
		/* Mouse location isn't screen clamped to the screen so use a linear mapping
		 * 2px == 1-int, or 1px == 1-ClickStep */
		if (is_float) {
			fac *= 0.01f * but->a1;
			tempf = (float)data->startvalue + ((float)(mx - data->dragstartx) * fac);
			tempf = ui_numedit_apply_snapf(but, tempf, softmin, softmax, softrange, snap);

#if 1       /* fake moving the click start, nicer for dragging back after passing the limit */
			if (tempf < softmin) {
				data->dragstartx -= (softmin - tempf) / fac;
				tempf = softmin;
			}
			else if (tempf > softmax) {
				data->dragstartx += (tempf - softmax) / fac;
				tempf = softmax;
			}
#else
			CLAMP(tempf, softmin, softmax);
#endif

			if (tempf != (float)data->value) {
				data->dragchange = true;
				data->value = tempf;
				changed = true;
			}
		}
		else {
			if      (softrange > 256) fac = 1.0;        /* 1px == 1 */
			else if (softrange >  32) fac = 1.0 / 2.0;  /* 2px == 1 */
			else                      fac = 1.0 / 16.0; /* 16px == 1? */

			temp = data->startvalue + (((double)mx - data->dragstartx) * (double)fac);
			temp = ui_numedit_apply_snap(temp, softmin, softmax, snap);

#if 1       /* fake moving the click start, nicer for dragging back after passing the limit */
			if (temp < softmin) {
				data->dragstartx -= (softmin - temp) / fac;
				temp = softmin;
			}
			else if (temp > softmax) {
				data->dragstartx += (temp - softmax) / fac;
				temp = softmax;
			}
#else
			CLAMP(temp, softmin, softmax);
#endif

			if (temp != data->value) {
				data->dragchange = true;
				data->value = temp;
				changed = true;
			}
		}

		data->draglastx = mx;
	}
	else {
		float non_linear_range_limit;
		float non_linear_pixel_map;
		float non_linear_scale;

		/* Use a non-linear mapping of the mouse drag especially for large floats (normal behavior) */
		deler = 500;
		if (is_float) {
			/* not needed for smaller float buttons */
			non_linear_range_limit = 11.0f;
			non_linear_pixel_map = 500.0f;
		}
		else {
			/* only scale large int buttons */
			non_linear_range_limit = 129.0f;
			/* larger for ints, we dont need to fine tune them */
			non_linear_pixel_map = 250.0f;

			/* prevent large ranges from getting too out of control */
			if      (softrange > 600) deler = powf(softrange, 0.75f);
			else if (softrange <  25) deler = 50.0;
			else if (softrange < 100) deler = 100.0;
		}
		deler /= fac;

		if (softrange > non_linear_range_limit) {
			non_linear_scale = (float)abs(mx - data->dragstartx) / non_linear_pixel_map;
		}
		else {
			non_linear_scale = 1.0f;
		}

		if (is_float == false) {
			/* at minimum, moving cursor 2 pixels should change an int button. */
			CLAMP_MIN(non_linear_scale, 0.5f * U.pixelsize);
		}

		data->dragf += (((float)(mx - data->draglastx)) / deler) * non_linear_scale;

		CLAMP(data->dragf, 0.0f, 1.0f);
		data->draglastx = mx;
		tempf = (softmin + data->dragf * softrange);


		if (!is_float) {
			temp = round_fl_to_int(tempf);

			temp = ui_numedit_apply_snap(temp, softmin, softmax, snap);

			CLAMP(temp, softmin, softmax);
			lvalue = (int)data->value;

			if (temp != lvalue) {
				data->dragchange = true;
				data->value = (double)temp;
				changed = true;
			}
		}
		else {
			temp = 0;
			tempf = ui_numedit_apply_snapf(but, tempf, softmin, softmax, softrange, snap);

			CLAMP(tempf, softmin, softmax);

			if (tempf != (float)data->value) {
				data->dragchange = true;
				data->value = tempf;
				changed = true;
			}
		}
	}


	return changed;
}

static void ui_numedit_set_active(uiBut *but)
{
	int oldflag = but->drawflag;
	but->drawflag &= ~(UI_BUT_ACTIVE_LEFT | UI_BUT_ACTIVE_RIGHT);

	uiHandleButtonData *data = but->active;
	if (!data) {
		return;
	}

	/* Ignore once we start dragging. */
	if (data->dragchange == false) {
		const  float handle_width = min_ff(BLI_rctf_size_x(&but->rect) / 3, BLI_rctf_size_y(&but->rect) * 0.7f);
		/* we can click on the side arrows to increment/decrement,
		 * or click inside to edit the value directly */
		int mx = data->window->eventstate->x;
		int my = data->window->eventstate->y;
		ui_window_to_block(data->region, but->block, &mx, &my);

		if (mx < (but->rect.xmin + handle_width)) {
			but->drawflag |= UI_BUT_ACTIVE_LEFT;
		}
		else if (mx > (but->rect.xmax - handle_width)) {
			but->drawflag |= UI_BUT_ACTIVE_RIGHT;
		}
	}

	/* Don't change the cursor once pressed. */
	if ((but->flag & UI_SELECT) == 0) {
		if ((but->drawflag & (UI_BUT_ACTIVE_LEFT)) || (but->drawflag & (UI_BUT_ACTIVE_RIGHT))) {
			if (data->changed_cursor) {
				WM_cursor_modal_restore(data->window);
				data->changed_cursor = false;
			}
		}
		else {
			if (data->changed_cursor == false) {
				WM_cursor_modal_set(data->window, CURSOR_X_MOVE);
				data->changed_cursor = true;
			}
		}
	}

	if (but->drawflag != oldflag) {
		ED_region_tag_redraw(data->region);
	}
}

static int ui_do_but_NUM(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my; /* mouse location scaled to fit the UI */
	int screen_mx, screen_my; /* mouse location kept at screen pixel coords */
	int click = 0;
	int retval = WM_UI_HANDLER_CONTINUE;

	mx = screen_mx = event->x;
	my = screen_my = event->y;

	ui_window_to_block(data->region, block, &mx, &my);
	ui_numedit_set_active(but);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		int type = event->type, val = event->val;

		if (type == MOUSEPAN) {
			ui_pan_to_scroll(event, &type, &val);
		}

		/* XXX hardcoded keymap check.... */
		if (type == MOUSEPAN && event->alt)
			retval = WM_UI_HANDLER_BREAK; /* allow accumulating values, otherwise scrolling gets preference */
		else if (type == WHEELDOWNMOUSE && event->ctrl) {
			mx = but->rect.xmin;
			but->drawflag &= ~UI_BUT_ACTIVE_RIGHT;
			but->drawflag |= UI_BUT_ACTIVE_LEFT;
			click = 1;
		}
		else if (type == WHEELUPMOUSE && event->ctrl) {
			mx = but->rect.xmax;
			but->drawflag &= ~UI_BUT_ACTIVE_LEFT;
			but->drawflag |= UI_BUT_ACTIVE_RIGHT;
			click = 1;
		}
		else if (event->val == KM_PRESS) {
			if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->ctrl) {
				button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
				retval = WM_UI_HANDLER_BREAK;
			}
			else if (event->type == LEFTMOUSE) {
				data->dragstartx = data->draglastx = ui_but_is_cursor_warp(but) ? screen_mx : mx;
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
				retval = WM_UI_HANDLER_BREAK;
			}
			else if (ELEM(event->type, PADENTER, RETKEY) && event->val == KM_PRESS) {
				click = 1;
			}
			else if (event->type == MINUSKEY && event->val == KM_PRESS) {
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
				data->value = -data->value;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				retval = WM_UI_HANDLER_BREAK;
			}

#ifdef USE_DRAG_MULTINUM
			copy_v2_v2_int(data->multi_data.drag_start, &event->x);
#endif
		}

	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY || event->type == RIGHTMOUSE) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			if (data->dragchange) {
#ifdef USE_DRAG_MULTINUM
				/* if we started multibutton but didn't drag, then edit */
				if (data->multi_data.init == BUTTON_MULTI_INIT_SETUP) {
					click = 1;
				}
				else
#endif
				{
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
			}
			else {
				click = 1;
			}
		}
		else if ((event->type == MOUSEMOVE) || ui_event_is_snap(event)) {
			const bool is_motion = (event->type == MOUSEMOVE);
			const enum eSnapType snap = ui_event_to_snap(event);
			float fac;

#ifdef USE_DRAG_MULTINUM
			data->multi_data.drag_dir[0] += abs(data->draglastx - mx);
			data->multi_data.drag_dir[1] += abs(data->draglasty - my);
#endif

			fac = 1.0f;
			if (event->shift) fac /= 10.0f;

			if (ui_numedit_but_NUM(but, data, (ui_but_is_cursor_warp(but) ? screen_mx : mx), is_motion, snap, fac)) {
				ui_numedit_apply(C, block, but, data);
			}
#ifdef USE_DRAG_MULTINUM
			else if (data->multi_data.has_mbuts) {
				if (data->multi_data.init == BUTTON_MULTI_INIT_ENABLE) {
					ui_multibut_states_apply(C, data, block);
				}
			}
#endif
		}
		retval = WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_TEXT_EDITING) {
		ui_do_but_textedit(C, block, but, data, event);
		retval = WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_TEXT_SELECTING) {
		ui_do_but_textedit_select(C, block, but, data, event);
		retval = WM_UI_HANDLER_BREAK;
	}

	if (click) {
		/* we can click on the side arrows to increment/decrement,
		 * or click inside to edit the value directly */
		float tempf, softmin, softmax;
		int temp;

		softmin = but->softmin;
		softmax = but->softmax;

		if (!ui_but_is_float(but)) {
			if (but->drawflag & UI_BUT_ACTIVE_LEFT) {
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

				temp = (int)data->value - 1;
				if (temp >= softmin && temp <= softmax)
					data->value = (double)temp;
				else
					data->cancel = true;

				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
			else if (but->drawflag & UI_BUT_ACTIVE_RIGHT) {
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

				temp = (int)data->value + 1;
				if (temp >= softmin && temp <= softmax)
					data->value = (double)temp;
				else
					data->cancel = true;

				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
			else {
				button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
			}
		}
		else {
			if (but->drawflag & UI_BUT_ACTIVE_LEFT) {
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

				tempf = (float)data->value - (UI_PRECISION_FLOAT_SCALE * but->a1);
				if (tempf < softmin) tempf = softmin;
				data->value = tempf;

				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
			else if (but->drawflag & UI_BUT_ACTIVE_RIGHT) {
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

				tempf = (float)data->value + (UI_PRECISION_FLOAT_SCALE * but->a1);
				if (tempf > softmax) tempf = softmax;
				data->value = tempf;

				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
			else {
				button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
			}
		}

		retval = WM_UI_HANDLER_BREAK;
	}

	data->draglastx = mx;
	data->draglasty = my;

	return retval;
}

static bool ui_numedit_but_SLI(
        uiBut *but, uiHandleButtonData *data,
        int mx, const bool is_horizontal, const bool is_motion,
        const bool snap, const bool shift)
{
	float deler, f, tempf, softmin, softmax, softrange;
	int temp, lvalue;
	bool changed = false;
	float mx_fl, my_fl;
	/* note, 'offs' is really from the widget drawing rounded corners see 'widget_numslider' */
	float offs;

	/* prevent unwanted drag adjustments, test motion so modifier keys refresh. */
	if ((but->type != UI_BTYPE_SCROLL) &&
	    (is_motion || data->draglock) &&
	    (ui_but_dragedit_update_mval(data, mx) == false))
	{
		return changed;
	}

	softmin = but->softmin;
	softmax = but->softmax;
	softrange = softmax - softmin;

	/* yes, 'mx' as both x/y is intentional */
	ui_mouse_scale_warp(data, mx, mx, &mx_fl, &my_fl, shift);

	if (but->type == UI_BTYPE_NUM_SLIDER) {
		offs = (BLI_rctf_size_y(&but->rect) / 2.0f);
		deler = BLI_rctf_size_x(&but->rect) - offs;
	}
	else if (but->type == UI_BTYPE_SCROLL) {
		const float size = (is_horizontal) ? BLI_rctf_size_x(&but->rect) : -BLI_rctf_size_y(&but->rect);
		deler = size * (but->softmax - but->softmin) / (but->softmax - but->softmin + but->a1);
		offs = 0.0;
	}
	else {
		offs = (BLI_rctf_size_y(&but->rect) / 2.0f);
		deler = (BLI_rctf_size_x(&but->rect) - offs);
	}

	f = (mx_fl - data->dragstartx) / deler + data->dragfstart;
	CLAMP(f, 0.0f, 1.0f);


	/* deal with mouse correction */
#ifdef USE_CONT_MOUSE_CORRECT
	if (ui_but_is_cursor_warp(but)) {
		/* OK but can go outside bounds */
		if (is_horizontal) {
			data->ungrab_mval[0] = (but->rect.xmin + offs) + (f * deler);
			data->ungrab_mval[1] = BLI_rctf_cent_y(&but->rect);
		}
		else {
			data->ungrab_mval[1] = (but->rect.ymin + offs) + (f * deler);
			data->ungrab_mval[0] = BLI_rctf_cent_x(&but->rect);
		}
		BLI_rctf_clamp_pt_v(&but->rect, data->ungrab_mval);
	}
#endif
	/* done correcting mouse */


	tempf = softmin + f * softrange;
	temp = round_fl_to_int(tempf);

	if (snap) {
		if (tempf == softmin || tempf == softmax) {
			/* pass */
		}
		else if (ui_but_is_float(but)) {

			if (shift) {
				if      (tempf == softmin || tempf == softmax) {}
				else if (softrange < 2.10f) tempf = roundf(tempf * 100.0f) * 0.01f;
				else if (softrange < 21.0f) tempf = roundf(tempf * 10.0f)  * 0.1f;
				else                        tempf = roundf(tempf);
			}
			else {
				if      (softrange < 2.10f) tempf = roundf(tempf * 10.0f) * 0.1f;
				else if (softrange < 21.0f) tempf = roundf(tempf);
				else                        tempf = roundf(tempf * 0.1f) * 10.0f;
			}
		}
		else {
			temp = 10 * (temp / 10);
			tempf = temp;
		}
	}

	if (!ui_but_is_float(but)) {
		lvalue = round(data->value);

		CLAMP(temp, softmin, softmax);

		if (temp != lvalue) {
			data->value = temp;
			data->dragchange = true;
			changed = true;
		}
	}
	else {
		CLAMP(tempf, softmin, softmax);

		if (tempf != (float)data->value) {
			data->value = tempf;
			data->dragchange = true;
			changed = true;
		}
	}

	return changed;
}

static int ui_do_but_SLI(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my, click = 0;
	int retval = WM_UI_HANDLER_CONTINUE;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		int type = event->type, val = event->val;

		if (type == MOUSEPAN) {
			ui_pan_to_scroll(event, &type, &val);
		}

		/* XXX hardcoded keymap check.... */
		if (type == MOUSEPAN && event->alt)
			retval = WM_UI_HANDLER_BREAK; /* allow accumulating values, otherwise scrolling gets preference */
		else if (type == WHEELDOWNMOUSE && event->ctrl) {
			mx = but->rect.xmin;
			click = 2;
		}
		else if (type == WHEELUPMOUSE && event->ctrl) {
			mx = but->rect.xmax;
			click = 2;
		}
		else if (event->val == KM_PRESS) {
			if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->ctrl) {
				button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
				retval = WM_UI_HANDLER_BREAK;
			}
#ifndef USE_ALLSELECT
			/* alt-click on sides to get "arrows" like in UI_BTYPE_NUM buttons, and match wheel usage above */
			else if (event->type == LEFTMOUSE && event->alt) {
				int halfpos = BLI_rctf_cent_x(&but->rect);
				click = 2;
				if (mx < halfpos)
					mx = but->rect.xmin;
				else
					mx = but->rect.xmax;
			}
#endif
			else if (event->type == LEFTMOUSE) {
				data->dragstartx = mx;
				data->draglastx = mx;
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
				retval = WM_UI_HANDLER_BREAK;
			}
			else if (ELEM(event->type, PADENTER, RETKEY) && event->val == KM_PRESS) {
				click = 1;
			}
			else if (event->type == MINUSKEY && event->val == KM_PRESS) {
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
				data->value = -data->value;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				retval = WM_UI_HANDLER_BREAK;
			}
		}
#ifdef USE_DRAG_MULTINUM
		copy_v2_v2_int(data->multi_data.drag_start, &event->x);
#endif
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY || event->type == RIGHTMOUSE) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			if (data->dragchange) {
#ifdef USE_DRAG_MULTINUM
				/* if we started multibutton but didn't drag, then edit */
				if (data->multi_data.init == BUTTON_MULTI_INIT_SETUP) {
					click = 1;
				}
				else
#endif
				{
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
			}
			else {
#ifdef USE_CONT_MOUSE_CORRECT
				/* reset! */
				copy_v2_fl(data->ungrab_mval, FLT_MAX);
#endif
				click = 1;
			}
		}
		else if ((event->type == MOUSEMOVE) || ui_event_is_snap(event)) {
			const bool is_motion = (event->type == MOUSEMOVE);
#ifdef USE_DRAG_MULTINUM
			data->multi_data.drag_dir[0] += abs(data->draglastx - mx);
			data->multi_data.drag_dir[1] += abs(data->draglasty - my);
#endif
			if (ui_numedit_but_SLI(but, data, mx, true, is_motion, event->ctrl != 0, event->shift != 0)) {
				ui_numedit_apply(C, block, but, data);
			}

#ifdef USE_DRAG_MULTINUM
			else if (data->multi_data.has_mbuts) {
				if (data->multi_data.init == BUTTON_MULTI_INIT_ENABLE) {
					ui_multibut_states_apply(C, data, block);
				}
			}
#endif
		}
		retval = WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_TEXT_EDITING) {
		ui_do_but_textedit(C, block, but, data, event);
		retval = WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_TEXT_SELECTING) {
		ui_do_but_textedit_select(C, block, but, data, event);
		retval = WM_UI_HANDLER_BREAK;
	}

	if (click) {
		if (click == 2) {
			/* nudge slider to the left or right */
			float f, tempf, softmin, softmax, softrange;
			int temp;

			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			softmin = but->softmin;
			softmax = but->softmax;
			softrange = softmax - softmin;

			tempf = data->value;
			temp = (int)data->value;

#if 0
			if (but->type == SLI) {
				f = (float)(mx - but->rect.xmin) / (BLI_rctf_size_x(&but->rect)); /* same as below */
			}
			else
#endif
			{
				f = (float)(mx - but->rect.xmin) / (BLI_rctf_size_x(&but->rect));
			}

			f = softmin + f * softrange;

			if (!ui_but_is_float(but)) {
				if (f < temp) temp--;
				else temp++;

				if (temp >= softmin && temp <= softmax)
					data->value = temp;
				else
					data->cancel = true;
			}
			else {
				if (f < tempf) tempf -= 0.01f;
				else tempf += 0.01f;

				if (tempf >= softmin && tempf <= softmax)
					data->value = tempf;
				else
					data->cancel = true;
			}

			button_activate_state(C, but, BUTTON_STATE_EXIT);
			retval = WM_UI_HANDLER_BREAK;
		}
		else {
			/* edit the value directly */
			button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
			retval = WM_UI_HANDLER_BREAK;
		}
	}

	data->draglastx = mx;
	data->draglasty = my;

	return retval;
}

static int ui_do_but_SCROLL(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my /*, click = 0 */;
	int retval = WM_UI_HANDLER_CONTINUE;
	bool horizontal = (BLI_rctf_size_x(&but->rect) > BLI_rctf_size_y(&but->rect));

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->val == KM_PRESS) {
			if (event->type == LEFTMOUSE) {
				if (horizontal) {
					data->dragstartx = mx;
					data->draglastx = mx;
				}
				else {
					data->dragstartx = my;
					data->draglastx = my;
				}
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
				retval = WM_UI_HANDLER_BREAK;
			}
			/* UNUSED - otherwise code is ok, add back if needed */
#if 0
			else if (ELEM(event->type, PADENTER, RETKEY) && event->val == KM_PRESS)
				click = 1;
#endif
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		else if (event->type == MOUSEMOVE) {
			const bool is_motion = (event->type == MOUSEMOVE);
			if (ui_numedit_but_SLI(but, data, (horizontal) ? mx : my, horizontal, is_motion, false, false)) {
				ui_numedit_apply(C, block, but, data);
			}
		}

		retval = WM_UI_HANDLER_BREAK;
	}

	return retval;
}

static int ui_do_but_GRIP(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my;
	int retval = WM_UI_HANDLER_CONTINUE;
	const bool horizontal = (BLI_rctf_size_x(&but->rect) < BLI_rctf_size_y(&but->rect));

	/* Note: Having to store org point in window space and recompute it to block "space" each time
	 *       is not ideal, but this is a way to hack around behavior of ui_window_to_block(), which
	 *       returns different results when the block is inside a panel or not...
	 *       See T37739.
	 */

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->val == KM_PRESS) {
			if (event->type == LEFTMOUSE) {
				data->dragstartx = event->x;
				data->dragstarty = event->y;
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
				retval = WM_UI_HANDLER_BREAK;
			}
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		else if (event->type == MOUSEMOVE) {
			int dragstartx = data->dragstartx;
			int dragstarty = data->dragstarty;
			ui_window_to_block(data->region, block, &dragstartx, &dragstarty);
			data->value = data->origvalue + (horizontal ? mx - dragstartx : dragstarty - my);
			ui_numedit_apply(C, block, but, data);
		}

		retval = WM_UI_HANDLER_BREAK;
	}

	return retval;
}

static int ui_do_but_LISTROW(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		/* hack to pass on ctrl+click and double click to overlapping text
		 * editing field for editing list item names
		 */
		if ((ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS && event->ctrl) ||
		    (event->type == LEFTMOUSE && event->val == KM_DBL_CLICK))
		{
			uiBut *labelbut = ui_but_list_row_text_activate(C, but, data, event, BUTTON_ACTIVATE_TEXT_EDITING);
			if (labelbut) {
				/* Nothing else to do. */
				return WM_UI_HANDLER_BREAK;
			}
		}
	}

	return ui_do_but_EXIT(C, but, data, event);
}

static int ui_do_but_BLOCK(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{

	if (data->state == BUTTON_STATE_HIGHLIGHT) {

		/* first handle click on icondrag type button */
		if (event->type == LEFTMOUSE && but->dragpoin && event->val == KM_PRESS) {
			if (ui_but_contains_point_px_icon(but, data->region, event)) {
				button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
				data->dragstartx = event->x;
				data->dragstarty = event->y;
				return WM_UI_HANDLER_BREAK;
			}
		}
#ifdef USE_DRAG_TOGGLE
		if (event->type == LEFTMOUSE && event->val == KM_PRESS && (ui_but_is_drag_toggle(but))) {
			button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
			data->dragstartx = event->x;
			data->dragstarty = event->y;
			return WM_UI_HANDLER_BREAK;
		}
#endif
		/* regular open menu */
		if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS) {
			button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
			return WM_UI_HANDLER_BREAK;
		}
		else if (but->type == UI_BTYPE_MENU) {
			if (ELEM(event->type, WHEELDOWNMOUSE, WHEELUPMOUSE) && event->ctrl) {
				const int direction = (event->type == WHEELDOWNMOUSE) ? -1 : 1;

				data->value = ui_but_menu_step(but, direction);

				button_activate_state(C, but, BUTTON_STATE_EXIT);
				ui_apply_but(C, but->block, but, data, true);

				/* button's state need to be changed to EXIT so moving mouse away from this mouse wouldn't lead
				 * to cancel changes made to this button, but changing state to EXIT also makes no button active for
				 * a while which leads to triggering operator when doing fast scrolling mouse wheel.
				 * using post activate stuff from button allows to make button be active again after checking for all
				 * all that mouse leave and cancel stuff, so quick scroll wouldn't be an issue anymore.
				 * same goes for scrolling wheel in another direction below (sergey)
				 */
				data->postbut = but;
				data->posttype = BUTTON_ACTIVATE_OVER;

				/* without this, a new interface that draws as result of the menu change
				 * won't register that the mouse is over it, eg:
				 * Alt+MouseWheel over the render slots, without this,
				 * the slot menu fails to switch a second time.
				 *
				 * The active state of the button could be maintained some other way
				 * and remove this mousemove event.
				 */
				WM_event_add_mousemove(C);

				return WM_UI_HANDLER_BREAK;
			}
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_DRAG) {

		/* this function also ends state */
		if (ui_but_drag_init(C, but, data, event)) {
			return WM_UI_HANDLER_BREAK;
		}

		/* outside icon quit, not needed if drag activated */
		if (0 == ui_but_contains_point_px_icon(but, data->region, event)) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			data->cancel = true;
			return WM_UI_HANDLER_BREAK;
		}

		if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
			return WM_UI_HANDLER_BREAK;
		}

	}

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_numedit_but_UNITVEC(
        uiBut *but, uiHandleButtonData *data,
        int mx, int my,
        const enum eSnapType snap)
{
	float dx, dy, rad, radsq, mrad, *fp;
	int mdx, mdy;
	bool changed = true;

	/* button is presumed square */
	/* if mouse moves outside of sphere, it does negative normal */

	/* note that both data->vec and data->origvec should be normalized
	 * else we'll get a harmless but annoying jump when first clicking */

	fp = data->origvec;
	rad = BLI_rctf_size_x(&but->rect);
	radsq = rad * rad;

	if (fp[2] > 0.0f) {
		mdx = (rad * fp[0]);
		mdy = (rad * fp[1]);
	}
	else if (fp[2] > -1.0f) {
		mrad = rad / sqrtf(fp[0] * fp[0] + fp[1] * fp[1]);

		mdx = 2.0f * mrad * fp[0] - (rad * fp[0]);
		mdy = 2.0f * mrad * fp[1] - (rad * fp[1]);
	}
	else {
		mdx = mdy = 0;
	}

	dx = (float)(mx + mdx - data->dragstartx);
	dy = (float)(my + mdy - data->dragstarty);

	fp = data->vec;
	mrad = dx * dx + dy * dy;
	if (mrad < radsq) { /* inner circle */
		fp[0] = dx;
		fp[1] = dy;
		fp[2] = sqrtf(radsq - dx * dx - dy * dy);
	}
	else {  /* outer circle */

		mrad = rad / sqrtf(mrad);  // veclen

		dx *= (2.0f * mrad - 1.0f);
		dy *= (2.0f * mrad - 1.0f);

		mrad = dx * dx + dy * dy;
		if (mrad < radsq) {
			fp[0] = dx;
			fp[1] = dy;
			fp[2] = -sqrtf(radsq - dx * dx - dy * dy);
		}
	}
	normalize_v3(fp);

	if (snap != SNAP_OFF) {
		const int snap_steps = (snap == SNAP_ON) ? 4 : 12;  /* 45 or 15 degree increments */
		const float snap_steps_angle = M_PI / snap_steps;
		float angle, angle_snap;
		int i;

		/* round each axis of 'fp' to the next increment
		 * do this in "angle" space - this gives increments of same size */
		for (i = 0; i < 3; i++) {
			angle = asinf(fp[i]);
			angle_snap = roundf((angle / snap_steps_angle)) * snap_steps_angle;
			fp[i] = sinf(angle_snap);
		}
		normalize_v3(fp);
		changed = !compare_v3v3(fp, data->origvec, FLT_EPSILON);
	}

	data->draglastx = mx;
	data->draglasty = my;

	return changed;
}

static void ui_palette_set_active(uiBut *but)
{
	if ((int)(but->a1) == UI_PALETTE_COLOR) {
		Palette *palette = but->rnapoin.id.data;
		PaletteColor *color = but->rnapoin.data;
		palette->active_color = BLI_findindex(&palette->colors, color);
	}
}

static int ui_do_but_COLOR(
        bContext *C, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		/* first handle click on icondrag type button */
		if (event->type == LEFTMOUSE && but->dragpoin && event->val == KM_PRESS) {
			ui_palette_set_active(but);
			if (ui_but_contains_point_px_icon(but, data->region, event)) {
				button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
				data->dragstartx = event->x;
				data->dragstarty = event->y;
				return WM_UI_HANDLER_BREAK;
			}
		}
#ifdef USE_DRAG_TOGGLE
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			ui_palette_set_active(but);
			button_activate_state(C, but, BUTTON_STATE_WAIT_DRAG);
			data->dragstartx = event->x;
			data->dragstarty = event->y;
			return WM_UI_HANDLER_BREAK;
		}
#endif
		/* regular open menu */
		if (ELEM(event->type, LEFTMOUSE, PADENTER, RETKEY) && event->val == KM_PRESS) {
			ui_palette_set_active(but);
			button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
			return WM_UI_HANDLER_BREAK;
		}
		else if (ELEM(event->type, MOUSEPAN, WHEELDOWNMOUSE, WHEELUPMOUSE) && event->ctrl) {
			ColorPicker *cpicker = but->custom_data;
			float hsv_static[3] = {0.0f};
			float *hsv = cpicker ? cpicker->color_data : hsv_static;
			float col[3];

			ui_but_v3_get(but, col);
			rgb_to_hsv_compat_v(col, hsv);

			if (event->type == WHEELDOWNMOUSE)
				hsv[2] = clamp_f(hsv[2] - 0.05f, 0.0f, 1.0f);
			else if (event->type == WHEELUPMOUSE)
				hsv[2] = clamp_f(hsv[2] + 0.05f, 0.0f, 1.0f);
			else {
				float fac = 0.005 * (event->y - event->prevy);
				hsv[2] = clamp_f(hsv[2] + fac, 0.0f, 1.0f);
			}

			hsv_to_rgb_v(hsv, data->vec);
			ui_but_v3_set(but, data->vec);

			button_activate_state(C, but, BUTTON_STATE_EXIT);
			ui_apply_but(C, but->block, but, data, true);
			return WM_UI_HANDLER_BREAK;
		}
		else if ((int)(but->a1) == UI_PALETTE_COLOR &&
		         event->type == DELKEY && event->val == KM_PRESS)
		{
			Palette *palette = but->rnapoin.id.data;
			PaletteColor *color = but->rnapoin.data;

			BKE_palette_color_remove(palette, color);

			button_activate_state(C, but, BUTTON_STATE_EXIT);

			/* this is risky. it works OK for now,
			 * but if it gives trouble we should delay execution */
			but->rnapoin = PointerRNA_NULL;
			but->rnaprop = NULL;

			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_WAIT_DRAG) {

		/* this function also ends state */
		if (ui_but_drag_init(C, but, data, event)) {
			return WM_UI_HANDLER_BREAK;
		}

		/* outside icon quit, not needed if drag activated */
		if (0 == ui_but_contains_point_px_icon(but, data->region, event)) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
			data->cancel = true;
			return WM_UI_HANDLER_BREAK;
		}

		if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			if ((int)(but->a1) == UI_PALETTE_COLOR) {
				if (!event->ctrl) {
					float color[3];
					Scene *scene = CTX_data_scene(C);
					ViewLayer *view_layer = CTX_data_view_layer(C);
					Paint *paint = BKE_paint_get_active(scene, view_layer);
					Brush *brush = BKE_paint_brush(paint);

					if (brush->flag & BRUSH_USE_GRADIENT) {
						float *target = &brush->gradient->data[brush->gradient->cur].r;

						if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA) {
							RNA_property_float_get_array(&but->rnapoin, but->rnaprop, target);
							IMB_colormanagement_srgb_to_scene_linear_v3(target);
						}
						else if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR) {
							RNA_property_float_get_array(&but->rnapoin, but->rnaprop, target);
						}
					}
					else {
						if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR_GAMMA) {
							RNA_property_float_get_array(&but->rnapoin, but->rnaprop, color);
							BKE_brush_color_set(scene, brush, color);
						}
						else if (but->rnaprop && RNA_property_subtype(but->rnaprop) == PROP_COLOR) {
							RNA_property_float_get_array(&but->rnapoin, but->rnaprop, color);
							IMB_colormanagement_scene_linear_to_srgb_v3(color);
							BKE_brush_color_set(scene, brush, color);
						}
					}

					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				else {
					button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
				}
			}
			else {
				button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
			}
			return WM_UI_HANDLER_BREAK;
		}

	}

	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_but_UNITVEC(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			const enum eSnapType snap = ui_event_to_snap(event);
			data->dragstartx = mx;
			data->dragstarty = my;
			data->draglastx = mx;
			data->draglasty = my;
			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			/* also do drag the first time */
			if (ui_numedit_but_UNITVEC(but, data, mx, my, snap))
				ui_numedit_apply(C, block, but, data);

			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if ((event->type == MOUSEMOVE) || ui_event_is_snap(event)) {
			if (mx != data->draglastx || my != data->draglasty || event->type != MOUSEMOVE) {
				const enum eSnapType snap = ui_event_to_snap(event);
				if (ui_numedit_but_UNITVEC(but, data, mx, my, snap))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}

		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

/* scales a vector so no axis exceeds max
 * (could become BLI_math func) */
static void clamp_axis_max_v3(float v[3], const float max)
{
	const float v_max = max_fff(v[0], v[1], v[2]);
	if (v_max > max) {
		mul_v3_fl(v, max / v_max);
		if (v[0] > max) v[0] = max;
		if (v[1] > max) v[1] = max;
		if (v[2] > max) v[2] = max;
	}
}

static void ui_rgb_to_color_picker_HSVCUBE_compat_v(uiBut *but, const float rgb[3], float hsv[3])
{
	if (but->a1 == UI_GRAD_L_ALT)
		rgb_to_hsl_compat_v(rgb, hsv);
	else
		rgb_to_hsv_compat_v(rgb, hsv);
}

static void ui_rgb_to_color_picker_HSVCUBE_v(uiBut *but, const float rgb[3], float hsv[3])
{
	if (but->a1 == UI_GRAD_L_ALT)
		rgb_to_hsl_v(rgb, hsv);
	else
		rgb_to_hsv_v(rgb, hsv);
}

static void ui_color_picker_to_rgb_HSVCUBE_v(uiBut *but, const float hsv[3], float rgb[3])
{
	if (but->a1 == UI_GRAD_L_ALT)
		hsl_to_rgb_v(hsv, rgb);
	else
		hsv_to_rgb_v(hsv, rgb);
}

static bool ui_numedit_but_HSVCUBE(
        uiBut *but, uiHandleButtonData *data,
        int mx, int my,
        const enum eSnapType snap, const bool shift)
{
	ColorPicker *cpicker = but->custom_data;
	float *hsv = cpicker->color_data;
	float rgb[3];
	float x, y;
	float mx_fl, my_fl;
	bool changed = true;

	ui_mouse_scale_warp(data, mx, my, &mx_fl, &my_fl, shift);

#ifdef USE_CONT_MOUSE_CORRECT
	if (ui_but_is_cursor_warp(but)) {
		/* OK but can go outside bounds */
		data->ungrab_mval[0] = mx_fl;
		data->ungrab_mval[1] = my_fl;
		BLI_rctf_clamp_pt_v(&but->rect, data->ungrab_mval);
	}
#endif

	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);

	ui_rgb_to_color_picker_HSVCUBE_compat_v(but, rgb, hsv);

	/* only apply the delta motion, not absolute */
	if (shift) {
		rcti rect_i;
		float xpos, ypos, hsvo[3];

		BLI_rcti_rctf_copy(&rect_i, &but->rect);

		/* calculate original hsv again */
		copy_v3_v3(rgb, data->origvec);
		ui_scene_linear_to_color_picker_space(but, rgb);

		copy_v3_v3(hsvo, hsv);

		ui_rgb_to_color_picker_HSVCUBE_compat_v(but, rgb, hsvo);

		/* and original position */
		ui_hsvcube_pos_from_vals(but, &rect_i, hsvo, &xpos, &ypos);

		mx_fl = xpos - (data->dragstartx - mx_fl);
		my_fl = ypos - (data->dragstarty - my_fl);
	}

	/* relative position within box */
	x = ((float)mx_fl - but->rect.xmin) / BLI_rctf_size_x(&but->rect);
	y = ((float)my_fl - but->rect.ymin) / BLI_rctf_size_y(&but->rect);
	CLAMP(x, 0.0f, 1.0f);
	CLAMP(y, 0.0f, 1.0f);

	switch ((int)but->a1) {
		case UI_GRAD_SV:
			hsv[1] = x;
			hsv[2] = y;
			break;
		case UI_GRAD_HV:
			hsv[0] = x;
			hsv[2] = y;
			break;
		case UI_GRAD_HS:
			hsv[0] = x;
			hsv[1] = y;
			break;
		case UI_GRAD_H:
			hsv[0] = x;
			break;
		case UI_GRAD_S:
			hsv[1] = x;
			break;
		case UI_GRAD_V:
			hsv[2] = x;
			break;
		case UI_GRAD_L_ALT:
			hsv[2] = y;
			break;
		case UI_GRAD_V_ALT:
		{
			/* vertical 'value' strip */
			float min = but->softmin, max = but->softmax;
			/* exception only for value strip - use the range set in but->min/max */
			hsv[2] = y * (max - min) + min;
			break;
		}
		default:
			BLI_assert(0);
			break;
	}

	if (snap != SNAP_OFF) {
		if (ELEM((int)but->a1, UI_GRAD_HV, UI_GRAD_HS, UI_GRAD_H)) {
			ui_color_snap_hue(snap, &hsv[0]);
		}
	}

	ui_color_picker_to_rgb_HSVCUBE_v(but, hsv, rgb);
	ui_color_picker_to_scene_linear_space(but, rgb);

	/* clamp because with color conversion we can exceed range [#34295] */
	if (but->a1 == UI_GRAD_V_ALT) {
		clamp_axis_max_v3(rgb, but->softmax);
	}

	copy_v3_v3(data->vec, rgb);

	data->draglastx = mx;
	data->draglasty = my;

	return changed;
}

#ifdef WITH_INPUT_NDOF
static void ui_ndofedit_but_HSVCUBE(
        uiBut *but, uiHandleButtonData *data,
        const wmNDOFMotionData *ndof,
        const enum eSnapType snap, const bool shift)
{
	ColorPicker *cpicker = but->custom_data;
	float *hsv = cpicker->color_data;
	const float hsv_v_max = max_ff(hsv[2], but->softmax);
	float rgb[3];
	float sensitivity = (shift ? 0.15f : 0.3f) * ndof->dt;

	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);
	ui_rgb_to_color_picker_HSVCUBE_compat_v(but, rgb, hsv);

	switch ((int)but->a1) {
		case UI_GRAD_SV:
			hsv[1] += ndof->rvec[2] * sensitivity;
			hsv[2] += ndof->rvec[0] * sensitivity;
			break;
		case UI_GRAD_HV:
			hsv[0] += ndof->rvec[2] * sensitivity;
			hsv[2] += ndof->rvec[0] * sensitivity;
			break;
		case UI_GRAD_HS:
			hsv[0] += ndof->rvec[2] * sensitivity;
			hsv[1] += ndof->rvec[0] * sensitivity;
			break;
		case UI_GRAD_H:
			hsv[0] += ndof->rvec[2] * sensitivity;
			break;
		case UI_GRAD_S:
			hsv[1] += ndof->rvec[2] * sensitivity;
			break;
		case UI_GRAD_V:
			hsv[2] += ndof->rvec[2] * sensitivity;
			break;
		case UI_GRAD_V_ALT:
		case UI_GRAD_L_ALT:
			/* vertical 'value' strip */

			/* exception only for value strip - use the range set in but->min/max */
			hsv[2] += ndof->rvec[0] * sensitivity;

			CLAMP(hsv[2], but->softmin, but->softmax);
			break;
		default:
			assert(!"invalid hsv type");
			break;
	}

	if (snap != SNAP_OFF) {
		if (ELEM((int)but->a1, UI_GRAD_HV, UI_GRAD_HS, UI_GRAD_H)) {
			ui_color_snap_hue(snap, &hsv[0]);
		}
	}

	/* ndof specific: the changes above aren't clamping */
	hsv_clamp_v(hsv, hsv_v_max);

	ui_color_picker_to_rgb_HSVCUBE_v(but, hsv, rgb);
	ui_color_picker_to_scene_linear_space(but, rgb);

	copy_v3_v3(data->vec, rgb);
	ui_but_v3_set(but, data->vec);
}
#endif /* WITH_INPUT_NDOF */

static int ui_do_but_HSVCUBE(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			const enum eSnapType snap = ui_event_to_snap(event);

			data->dragstartx = mx;
			data->dragstarty = my;
			data->draglastx = mx;
			data->draglasty = my;
			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			/* also do drag the first time */
			if (ui_numedit_but_HSVCUBE(but, data, mx, my, snap, event->shift != 0))
				ui_numedit_apply(C, block, but, data);

			return WM_UI_HANDLER_BREAK;
		}
#ifdef WITH_INPUT_NDOF
		else if (event->type == NDOF_MOTION) {
			const wmNDOFMotionData *ndof = event->customdata;
			const enum eSnapType snap = ui_event_to_snap(event);

			ui_ndofedit_but_HSVCUBE(but, data, ndof, snap, event->shift != 0);

			button_activate_state(C, but, BUTTON_STATE_EXIT);
			ui_apply_but(C, but->block, but, data, true);

			return WM_UI_HANDLER_BREAK;
		}
#endif /* WITH_INPUT_NDOF */
		/* XXX hardcoded keymap check.... */
		else if (event->type == BACKSPACEKEY && event->val == KM_PRESS) {
			if (ELEM(but->a1, UI_GRAD_V_ALT, UI_GRAD_L_ALT)) {
				int len;

				/* reset only value */

				len = RNA_property_array_length(&but->rnapoin, but->rnaprop);
				if (ELEM(len, 3, 4)) {
					float rgb[3], def_hsv[3];
					float def[4];
					ColorPicker *cpicker = but->custom_data;
					float *hsv = cpicker->color_data;

					RNA_property_float_get_default_array(&but->rnapoin, but->rnaprop, def);
					ui_rgb_to_color_picker_HSVCUBE_v(but, def, def_hsv);

					ui_but_v3_get(but, rgb);
					ui_rgb_to_color_picker_HSVCUBE_compat_v(but, rgb, hsv);

					def_hsv[0] = hsv[0];
					def_hsv[1] = hsv[1];

					ui_color_picker_to_rgb_HSVCUBE_v(but, def_hsv, rgb);
					ui_but_v3_set(but, rgb);

					RNA_property_update(C, &but->rnapoin, but->rnaprop);
					return WM_UI_HANDLER_BREAK;
				}
			}
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY || event->type == RIGHTMOUSE) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if ((event->type == MOUSEMOVE) || ui_event_is_snap(event)) {
			if (mx != data->draglastx || my != data->draglasty || event->type != MOUSEMOVE) {
				const enum eSnapType snap = ui_event_to_snap(event);

				if (ui_numedit_but_HSVCUBE(but, data, mx, my, snap, event->shift != 0))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}

		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_numedit_but_HSVCIRCLE(
        uiBut *but, uiHandleButtonData *data,
        float mx, float my,
        const enum eSnapType snap, const bool shift)
{
	rcti rect;
	bool changed = true;
	float mx_fl, my_fl;
	float rgb[3];
	ColorPicker *cpicker = but->custom_data;
	float *hsv = cpicker->color_data;

	ui_mouse_scale_warp(data, mx, my, &mx_fl, &my_fl, shift);

#ifdef USE_CONT_MOUSE_CORRECT
	if (ui_but_is_cursor_warp(but)) {
		/* OK but can go outside bounds */
		data->ungrab_mval[0] = mx_fl;
		data->ungrab_mval[1] = my_fl;
		{	/* clamp */
			const float radius = min_ff(BLI_rctf_size_x(&but->rect), BLI_rctf_size_y(&but->rect)) / 2.0f;
			const float cent[2] = {BLI_rctf_cent_x(&but->rect), BLI_rctf_cent_y(&but->rect)};
			const float len = len_v2v2(cent, data->ungrab_mval);
			if (len > radius) {
				dist_ensure_v2_v2fl(data->ungrab_mval, cent, radius);
			}
		}
	}
#endif

	BLI_rcti_rctf_copy(&rect, &but->rect);

	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);
	ui_rgb_to_color_picker_compat_v(rgb, hsv);

	/* exception, when using color wheel in 'locked' value state:
	 * allow choosing a hue for black values, by giving a tiny increment */
	if (but->flag & UI_BUT_COLOR_LOCK) {
		if (U.color_picker_type == USER_CP_CIRCLE_HSV) { // lock
			if (hsv[2] == 0.f) hsv[2] = 0.0001f;
		}
		else {
			if (hsv[2] == 0.0f) hsv[2] = 0.0001f;
			if (hsv[2] >= 0.9999f) hsv[2] = 0.9999f;
		}
	}

	/* only apply the delta motion, not absolute */
	if (shift) {
		float xpos, ypos, hsvo[3], rgbo[3];

		/* calculate original hsv again */
		copy_v3_v3(hsvo, hsv);
		copy_v3_v3(rgbo, data->origvec);
		ui_scene_linear_to_color_picker_space(but, rgbo);
		ui_rgb_to_color_picker_compat_v(rgbo, hsvo);

		/* and original position */
		ui_hsvcircle_pos_from_vals(but, &rect, hsvo, &xpos, &ypos);

		mx_fl = xpos - (data->dragstartx - mx_fl);
		my_fl = ypos - (data->dragstarty - my_fl);

	}

	ui_hsvcircle_vals_from_pos(hsv, hsv + 1, &rect, mx_fl, my_fl);

	if ((but->flag & UI_BUT_COLOR_CUBIC) && (U.color_picker_type == USER_CP_CIRCLE_HSV))
		hsv[1] = 1.0f - sqrt3f(1.0f - hsv[1]);

	if (snap != SNAP_OFF) {
		ui_color_snap_hue(snap, &hsv[0]);
	}

	ui_color_picker_to_rgb_v(hsv, rgb);

	if ((but->flag & UI_BUT_VEC_SIZE_LOCK) && (rgb[0] || rgb[1] || rgb[2])) {
		normalize_v3_length(rgb, but->a2);
	}

	ui_color_picker_to_scene_linear_space(but, rgb);
	ui_but_v3_set(but, rgb);

	data->draglastx = mx;
	data->draglasty = my;

	return changed;
}

#ifdef WITH_INPUT_NDOF
static void ui_ndofedit_but_HSVCIRCLE(
        uiBut *but, uiHandleButtonData *data,
        const wmNDOFMotionData *ndof,
        const enum eSnapType snap, const bool shift)
{
	ColorPicker *cpicker = but->custom_data;
	float *hsv = cpicker->color_data;
	float rgb[3];
	float phi, r /*, sqr */ /* UNUSED */, v[2];
	float sensitivity = (shift ? 0.06f : 0.3f) * ndof->dt;

	ui_but_v3_get(but, rgb);
	ui_scene_linear_to_color_picker_space(but, rgb);
	ui_rgb_to_color_picker_compat_v(rgb, hsv);

	/* Convert current color on hue/sat disc to circular coordinates phi, r */
	phi = fmodf(hsv[0] + 0.25f, 1.0f) * -2.0f * (float)M_PI;
	r = hsv[1];
	/* sqr = r > 0.0f ? sqrtf(r) : 1; */ /* UNUSED */

	/* Convert to 2d vectors */
	v[0] = r * cosf(phi);
	v[1] = r * sinf(phi);

	/* Use ndof device y and x rotation to move the vector in 2d space */
	v[0] += ndof->rvec[2] * sensitivity;
	v[1] += ndof->rvec[0] * sensitivity;

	/* convert back to polar coords on circle */
	phi = atan2f(v[0], v[1]) / (2.0f * (float)M_PI) + 0.5f;

	/* use ndof Y rotation to additionally rotate hue */
	phi += ndof->rvec[1] * sensitivity * 0.5f;
	r = len_v2(v);

	/* convert back to hsv values, in range [0,1] */
	hsv[0] = phi;
	hsv[1] = r;

	/* exception, when using color wheel in 'locked' value state:
	 * allow choosing a hue for black values, by giving a tiny increment */
	if (but->flag & UI_BUT_COLOR_LOCK) {
		if (U.color_picker_type == USER_CP_CIRCLE_HSV) { // lock
			if (hsv[2] == 0.f) hsv[2] = 0.0001f;
		}
		else {
			if (hsv[2] == 0.f) hsv[2] = 0.0001f;
			if (hsv[2] == 1.f) hsv[2] = 0.9999f;
		}
	}

	if (snap != SNAP_OFF) {
		ui_color_snap_hue(snap, &hsv[0]);
	}

	hsv_clamp_v(hsv, FLT_MAX);

	ui_color_picker_to_rgb_v(hsv, data->vec);

	if ((but->flag & UI_BUT_VEC_SIZE_LOCK) && (data->vec[0] || data->vec[1] || data->vec[2])) {
		normalize_v3_length(data->vec, but->a2);
	}

	ui_color_picker_to_scene_linear_space(but, data->vec);
	ui_but_v3_set(but, data->vec);
}
#endif /* WITH_INPUT_NDOF */

static int ui_do_but_HSVCIRCLE(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	ColorPicker *cpicker = but->custom_data;
	float *hsv = cpicker->color_data;
	int mx, my;
	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			const enum eSnapType snap = ui_event_to_snap(event);
			data->dragstartx = mx;
			data->dragstarty = my;
			data->draglastx = mx;
			data->draglasty = my;
			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			/* also do drag the first time */
			if (ui_numedit_but_HSVCIRCLE(but, data, mx, my, snap, event->shift != 0))
				ui_numedit_apply(C, block, but, data);

			return WM_UI_HANDLER_BREAK;
		}
#ifdef WITH_INPUT_NDOF
		else if (event->type == NDOF_MOTION) {
			const enum eSnapType snap = ui_event_to_snap(event);
			const wmNDOFMotionData *ndof = event->customdata;

			ui_ndofedit_but_HSVCIRCLE(but, data, ndof, snap, event->shift != 0);

			button_activate_state(C, but, BUTTON_STATE_EXIT);
			ui_apply_but(C, but->block, but, data, true);

			return WM_UI_HANDLER_BREAK;
		}
#endif /* WITH_INPUT_NDOF */
		/* XXX hardcoded keymap check.... */
		else if (event->type == BACKSPACEKEY && event->val == KM_PRESS) {
			int len;

			/* reset only saturation */

			len = RNA_property_array_length(&but->rnapoin, but->rnaprop);
			if (len >= 3) {
				float rgb[3], def_hsv[3];
				float *def;
				def = MEM_callocN(sizeof(float) * len, "reset_defaults - float");

				RNA_property_float_get_default_array(&but->rnapoin, but->rnaprop, def);
				ui_color_picker_to_rgb_v(def, def_hsv);

				ui_but_v3_get(but, rgb);
				ui_rgb_to_color_picker_compat_v(rgb, hsv);

				def_hsv[0] = hsv[0];
				def_hsv[2] = hsv[2];

				hsv_to_rgb_v(def_hsv, rgb);
				ui_but_v3_set(but, rgb);

				RNA_property_update(C, &but->rnapoin, but->rnaprop);

				MEM_freeN(def);
			}
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY || event->type == RIGHTMOUSE) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		/* XXX hardcoded keymap check.... */
		else if (event->type == WHEELDOWNMOUSE) {
			hsv[2] = clamp_f(hsv[2] - 0.05f, 0.0f, 1.0f);
			ui_but_hsv_set(but);    /* converts to rgb */
			ui_numedit_apply(C, block, but, data);
		}
		else if (event->type == WHEELUPMOUSE) {
			hsv[2] = clamp_f(hsv[2] + 0.05f, 0.0f, 1.0f);
			ui_but_hsv_set(but);    /* converts to rgb */
			ui_numedit_apply(C, block, but, data);
		}
		else if ((event->type == MOUSEMOVE) || ui_event_is_snap(event)) {
			if (mx != data->draglastx || my != data->draglasty || event->type != MOUSEMOVE) {
				const enum eSnapType snap = ui_event_to_snap(event);

				if (ui_numedit_but_HSVCIRCLE(but, data, mx, my, snap, event->shift != 0)) {
					ui_numedit_apply(C, block, but, data);
				}
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}


static bool ui_numedit_but_COLORBAND(uiBut *but, uiHandleButtonData *data, int mx)
{
	float dx;
	bool changed = false;

	if (data->draglastx == mx)
		return changed;

	if (data->coba->tot == 0)
		return changed;

	dx = ((float)(mx - data->draglastx)) / BLI_rctf_size_x(&but->rect);
	data->dragcbd->pos += dx;
	CLAMP(data->dragcbd->pos, 0.0f, 1.0f);

	BKE_colorband_update_sort(data->coba);
	data->dragcbd = data->coba->data + data->coba->cur;  /* because qsort */

	data->draglastx = mx;
	changed = true;

	return changed;
}

static int ui_do_but_COLORBAND(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	ColorBand *coba;
	CBData *cbd;
	/* ignore zoom-level for mindist */
	int mindist = (50 * UI_DPI_FAC) * block->aspect;
	int mx, my, a, xco;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			coba = (ColorBand *)but->poin;

			if (event->ctrl) {
				/* insert new key on mouse location */
				float pos = ((float)(mx - but->rect.xmin)) / BLI_rctf_size_x(&but->rect);
				BKE_colorband_element_add(coba, pos);
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
			else {
				data->dragstartx = mx;
				data->dragstarty = my;
				data->draglastx = mx;
				data->draglasty = my;

				/* activate new key when mouse is close */
				for (a = 0, cbd = coba->data; a < coba->tot; a++, cbd++) {
					xco = but->rect.xmin + (cbd->pos * BLI_rctf_size_x(&but->rect));
					xco = ABS(xco - mx);
					if (a == coba->cur) xco += 5;  // selected one disadvantage
					if (xco < mindist) {
						coba->cur = a;
						mindist = xco;
					}
				}

				data->dragcbd = coba->data + coba->cur;
				data->dragfstart = data->dragcbd->pos;
				button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
			}

			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == MOUSEMOVE) {
			if (mx != data->draglastx || my != data->draglasty) {
				if (ui_numedit_but_COLORBAND(but, data, mx))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		else if (ELEM(event->type, ESCKEY, RIGHTMOUSE)) {
			if (event->val == KM_PRESS) {
				data->dragcbd->pos = data->dragfstart;
				BKE_colorband_update_sort(data->coba);
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_numedit_but_CURVE(
        uiBlock *block, uiBut *but, uiHandleButtonData *data,
        int evtx, int evty,
        bool snap, const bool shift)
{
	CurveMapping *cumap = (CurveMapping *)but->poin;
	CurveMap *cuma = cumap->cm + cumap->cur;
	CurveMapPoint *cmp = cuma->curve;
	float fx, fy, zoomx, zoomy;
	int mx, my, dragx, dragy;
	int a;
	bool changed = false;

	/* evtx evty and drag coords are absolute mousecoords, prevents errors when editing when layout changes */
	mx = evtx;
	my = evty;
	ui_window_to_block(data->region, block, &mx, &my);
	dragx = data->draglastx;
	dragy = data->draglasty;
	ui_window_to_block(data->region, block, &dragx, &dragy);

	zoomx = BLI_rctf_size_x(&but->rect) / BLI_rctf_size_x(&cumap->curr);
	zoomy = BLI_rctf_size_y(&but->rect) / BLI_rctf_size_y(&cumap->curr);

	if (snap) {
		float d[2];

		d[0] = mx - data->dragstartx;
		d[1] = my - data->dragstarty;

		if (len_squared_v2(d) < (3.0f * 3.0f))
			snap = false;
	}

	if (data->dragsel != -1) {
		CurveMapPoint *cmp_last = NULL;
		const float mval_factor = ui_mouse_scale_warp_factor(shift);
		bool moved_point = false;  /* for ctrl grid, can't use orig coords because of sorting */

		fx = (mx - dragx) / zoomx;
		fy = (my - dragy) / zoomy;

		fx *= mval_factor;
		fy *= mval_factor;

		for (a = 0; a < cuma->totpoint; a++) {
			if (cmp[a].flag & CUMA_SELECT) {
				float origx = cmp[a].x, origy = cmp[a].y;
				cmp[a].x += fx;
				cmp[a].y += fy;
				if (snap) {
					cmp[a].x = 0.125f * roundf(8.0f * cmp[a].x);
					cmp[a].y = 0.125f * roundf(8.0f * cmp[a].y);
				}
				if (cmp[a].x != origx || cmp[a].y != origy)
					moved_point = true;

				cmp_last = &cmp[a];
			}
		}

		curvemapping_changed(cumap, false);

		if (moved_point) {
			data->draglastx = evtx;
			data->draglasty = evty;
			changed = true;

#ifdef USE_CONT_MOUSE_CORRECT
			/* note: using 'cmp_last' is weak since there may be multiple points selected,
			 * but in practice this isnt really an issue */
			if (ui_but_is_cursor_warp(but)) {
				/* OK but can go outside bounds */
				data->ungrab_mval[0] = but->rect.xmin + ((cmp_last->x - cumap->curr.xmin) * zoomx);
				data->ungrab_mval[1] = but->rect.ymin + ((cmp_last->y - cumap->curr.ymin) * zoomy);
				BLI_rctf_clamp_pt_v(&but->rect, data->ungrab_mval);
			}
#endif

		}

		data->dragchange = true;  /* mark for selection */
	}
	else {
		fx = (mx - dragx) / zoomx;
		fy = (my - dragy) / zoomy;

		/* clamp for clip */
		if (cumap->flag & CUMA_DO_CLIP) {
			if (cumap->curr.xmin - fx < cumap->clipr.xmin)
				fx = cumap->curr.xmin - cumap->clipr.xmin;
			else if (cumap->curr.xmax - fx > cumap->clipr.xmax)
				fx = cumap->curr.xmax - cumap->clipr.xmax;
			if (cumap->curr.ymin - fy < cumap->clipr.ymin)
				fy = cumap->curr.ymin - cumap->clipr.ymin;
			else if (cumap->curr.ymax - fy > cumap->clipr.ymax)
				fy = cumap->curr.ymax - cumap->clipr.ymax;
		}

		cumap->curr.xmin -= fx;
		cumap->curr.ymin -= fy;
		cumap->curr.xmax -= fx;
		cumap->curr.ymax -= fy;

		data->draglastx = evtx;
		data->draglasty = evty;

		changed = true;
	}

	return changed;
}

static int ui_do_but_CURVE(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my, a;
	bool changed = false;
	Scene *scene = CTX_data_scene(C);
	ViewLayer *view_layer = CTX_data_view_layer(C);

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			CurveMapping *cumap = (CurveMapping *)but->poin;
			CurveMap *cuma = cumap->cm + cumap->cur;
			CurveMapPoint *cmp;
			const float m_xy[2] = {mx, my};
			float dist_min_sq = SQUARE(14.0f);  /* 14 pixels radius */
			int sel = -1;

			if (event->ctrl) {
				float f_xy[2];
				BLI_rctf_transform_pt_v(&cumap->curr, &but->rect, f_xy, m_xy);

				curvemap_insert(cuma, f_xy[0], f_xy[1]);
				curvemapping_changed(cumap, false);
				changed = true;
			}

			/* check for selecting of a point */
			cmp = cuma->curve;   /* ctrl adds point, new malloc */
			for (a = 0; a < cuma->totpoint; a++) {
				float f_xy[2];
				BLI_rctf_transform_pt_v(&but->rect, &cumap->curr, f_xy, &cmp[a].x);
				const float dist_sq = len_squared_v2v2(m_xy, f_xy);
				if (dist_sq < dist_min_sq) {
					sel = a;
					dist_min_sq = dist_sq;
				}
			}

			if (sel == -1) {
				int i;
				float f_xy[2], f_xy_prev[2];

				/* if the click didn't select anything, check if it's clicked on the
				 * curve itself, and if so, add a point */
				cmp = cuma->table;

				BLI_rctf_transform_pt_v(&but->rect, &cumap->curr, f_xy, &cmp[0].x);

				/* with 160px height 8px should translate to the old 0.05 coefficient at no zoom */
				dist_min_sq = SQUARE(8.0f);

				/* loop through the curve segment table and find what's near the mouse. */
				for (i = 1; i <= CM_TABLE; i++) {
					copy_v2_v2(f_xy_prev, f_xy);
					BLI_rctf_transform_pt_v(&but->rect, &cumap->curr, f_xy, &cmp[i].x);

					if (dist_squared_to_line_segment_v2(m_xy, f_xy_prev, f_xy) < dist_min_sq) {
						BLI_rctf_transform_pt_v(&cumap->curr, &but->rect, f_xy, m_xy);

						curvemap_insert(cuma, f_xy[0], f_xy[1]);
						curvemapping_changed(cumap, false);

						changed = true;

						/* reset cmp back to the curve points again, rather than drawing segments */
						cmp = cuma->curve;

						/* find newly added point and make it 'sel' */
						for (a = 0; a < cuma->totpoint; a++) {
							if (cmp[a].x == f_xy[0]) {
								sel = a;
							}
						}
						break;
					}
				}
			}

			if (sel != -1) {
				/* ok, we move a point */
				/* deselect all if this one is deselect. except if we hold shift */
				if (!event->shift) {
					for (a = 0; a < cuma->totpoint; a++) {
						cmp[a].flag &= ~CUMA_SELECT;
					}
					cmp[sel].flag |= CUMA_SELECT;
				}
				else {
					cmp[sel].flag ^= CUMA_SELECT;
				}
			}
			else {
				/* move the view */
				data->cancel = true;
			}

			data->dragsel = sel;

			data->dragstartx = event->x;
			data->dragstarty = event->y;
			data->draglastx = event->x;
			data->draglasty = event->y;

			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == MOUSEMOVE) {
			if (event->x != data->draglastx || event->y != data->draglasty) {

				if (ui_numedit_but_CURVE(block, but, data, event->x, event->y, event->ctrl != 0, event->shift != 0))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			if (data->dragsel != -1) {
				CurveMapping *cumap = (CurveMapping *)but->poin;
				CurveMap *cuma = cumap->cm + cumap->cur;
				CurveMapPoint *cmp = cuma->curve;

				if (data->dragchange == false) {
					/* deselect all, select one */
					if (!event->shift) {
						for (a = 0; a < cuma->totpoint; a++)
							cmp[a].flag &= ~CUMA_SELECT;
						cmp[data->dragsel].flag |= CUMA_SELECT;
					}
				}
				else {
					curvemapping_changed(cumap, true);  /* remove doubles */
					BKE_paint_invalidate_cursor_overlay(scene, view_layer, cumap);
				}
			}

			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}

		return WM_UI_HANDLER_BREAK;
	}

	/* UNUSED but keep for now */
	(void)changed;

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_numedit_but_HISTOGRAM(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
	Histogram *hist = (Histogram *)but->poin;
	bool changed = true;
	float dy = my - data->draglasty;

	/* scale histogram values (dy / 10 for better control) */
	const float yfac = min_ff(pow2f(hist->ymax), 1.0f) * 0.5f;
	hist->ymax += (dy * 0.1f) * yfac;

	/* 0.1 allows us to see HDR colors up to 10 */
	CLAMP(hist->ymax, 0.1f, 100.f);

	data->draglastx = mx;
	data->draglasty = my;

	return changed;
}

static int ui_do_but_HISTOGRAM(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			data->dragstartx = mx;
			data->dragstarty = my;
			data->draglastx = mx;
			data->draglasty = my;
			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			/* also do drag the first time */
			if (ui_numedit_but_HISTOGRAM(but, data, mx, my))
				ui_numedit_apply(C, block, but, data);

			return WM_UI_HANDLER_BREAK;
		}
		/* XXX hardcoded keymap check.... */
		else if (event->type == BACKSPACEKEY && event->val == KM_PRESS) {
			Histogram *hist = (Histogram *)but->poin;
			hist->ymax = 1.f;

			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == MOUSEMOVE) {
			if (mx != data->draglastx || my != data->draglasty) {
				if (ui_numedit_but_HISTOGRAM(but, data, mx, my))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_numedit_but_WAVEFORM(uiBut *but, uiHandleButtonData *data, int mx, int my)
{
	Scopes *scopes = (Scopes *)but->poin;
	bool changed = true;
	float dy;

	dy = my - data->draglasty;

	/* scale waveform values */
	scopes->wavefrm_yfac += dy / 200.0f;

	CLAMP(scopes->wavefrm_yfac, 0.5f, 2.0f);

	data->draglastx = mx;
	data->draglasty = my;

	return changed;
}

static int ui_do_but_WAVEFORM(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			data->dragstartx = mx;
			data->dragstarty = my;
			data->draglastx = mx;
			data->draglasty = my;
			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			/* also do drag the first time */
			if (ui_numedit_but_WAVEFORM(but, data, mx, my))
				ui_numedit_apply(C, block, but, data);

			return WM_UI_HANDLER_BREAK;
		}
		/* XXX hardcoded keymap check.... */
		else if (event->type == BACKSPACEKEY && event->val == KM_PRESS) {
			Scopes *scopes = (Scopes *)but->poin;
			scopes->wavefrm_yfac = 1.f;

			button_activate_state(C, but, BUTTON_STATE_EXIT);
			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == MOUSEMOVE) {
			if (mx != data->draglastx || my != data->draglasty) {
				if (ui_numedit_but_WAVEFORM(but, data, mx, my))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static bool ui_numedit_but_TRACKPREVIEW(
        bContext *C, uiBut *but, uiHandleButtonData *data,
        int mx, int my,
        const bool shift)
{
	MovieClipScopes *scopes = (MovieClipScopes *)but->poin;
	bool changed = true;
	float dx, dy;

	dx = mx - data->draglastx;
	dy = my - data->draglasty;

	if (shift) {
		dx /= 5.0f;
		dy /= 5.0f;
	}

	if (!scopes->track_locked) {
		if (scopes->marker->framenr != scopes->framenr)
			scopes->marker = BKE_tracking_marker_ensure(scopes->track, scopes->framenr);

		scopes->marker->flag &= ~(MARKER_DISABLED | MARKER_TRACKED);
		scopes->marker->pos[0] += -dx * scopes->slide_scale[0] / BLI_rctf_size_x(&but->block->rect);
		scopes->marker->pos[1] += -dy * scopes->slide_scale[1] / BLI_rctf_size_y(&but->block->rect);

		WM_event_add_notifier(C, NC_MOVIECLIP | NA_EDITED, NULL);
	}

	scopes->ok = 0;

	data->draglastx = mx;
	data->draglasty = my;

	return changed;
}

static int ui_do_but_TRACKPREVIEW(
        bContext *C, uiBlock *block, uiBut *but,
        uiHandleButtonData *data, const wmEvent *event)
{
	int mx, my;

	mx = event->x;
	my = event->y;
	ui_window_to_block(data->region, block, &mx, &my);

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		if (event->type == LEFTMOUSE && event->val == KM_PRESS) {
			data->dragstartx = mx;
			data->dragstarty = my;
			data->draglastx = mx;
			data->draglasty = my;
			button_activate_state(C, but, BUTTON_STATE_NUM_EDITING);

			/* also do drag the first time */
			if (ui_numedit_but_TRACKPREVIEW(C, but, data, mx, my, event->shift != 0))
				ui_numedit_apply(C, block, but, data);

			return WM_UI_HANDLER_BREAK;
		}
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		if (event->type == ESCKEY) {
			if (event->val == KM_PRESS) {
				data->cancel = true;
				data->escapecancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
			}
		}
		else if (event->type == MOUSEMOVE) {
			if (mx != data->draglastx || my != data->draglasty) {
				if (ui_numedit_but_TRACKPREVIEW(C, but, data, mx, my, event->shift != 0))
					ui_numedit_apply(C, block, but, data);
			}
		}
		else if (event->type == LEFTMOUSE && event->val == KM_RELEASE) {
			button_activate_state(C, but, BUTTON_STATE_EXIT);
		}
		return WM_UI_HANDLER_BREAK;
	}

	return WM_UI_HANDLER_CONTINUE;
}

static int ui_do_button(bContext *C, uiBlock *block, uiBut *but, const wmEvent *event)
{
	uiHandleButtonData *data;
	int retval;

	data = but->active;
	retval = WM_UI_HANDLER_CONTINUE;

	bool is_disabled = but->flag & UI_BUT_DISABLED;

	/* if but->pointype is set, but->poin should be too */
	BLI_assert(!but->pointype || but->poin);

	/* Only hard-coded stuff here, button interactions with configurable
	 * keymaps are handled using operators (see #ED_keymap_ui). */

	if ((data->state == BUTTON_STATE_HIGHLIGHT) || (event->type == EVT_DROP)) {

		/* handle copy and paste */
		bool is_press_ctrl_but_no_shift = event->val == KM_PRESS && IS_EVENT_MOD(event, ctrl, oskey) && !event->shift;
		bool do_copy = event->type == CKEY && is_press_ctrl_but_no_shift;
		bool do_paste = event->type == VKEY && is_press_ctrl_but_no_shift;

		/* Specific handling for listrows, we try to find their overlapping tex button. */
		if ((do_copy || do_paste) && but->type == UI_BTYPE_LISTROW) {
			uiBut *labelbut = ui_but_list_row_text_activate(C, but, data, event, BUTTON_ACTIVATE_OVER);
			if (labelbut) {
				but = labelbut;
				data = but->active;
			}
		}

		/* do copy first, because it is the only allowed operator when disabled */
		if (do_copy) {
			ui_but_copy(C, but, event->alt);
			return WM_UI_HANDLER_BREAK;
		}

		/* handle menu */
		if ((event->type == RIGHTMOUSE) &&
		    !IS_EVENT_MOD(event, shift, ctrl, alt, oskey) &&
		    (event->val == KM_PRESS))
		{
			/* RMB has two options now */
			if (ui_popup_context_menu_for_button(C, but)) {
				return WM_UI_HANDLER_BREAK;
			}
		}

		if (is_disabled) {
			return WM_UI_HANDLER_CONTINUE;
		}

		if (do_paste) {
			ui_but_paste(C, but, data, event->alt);
			return WM_UI_HANDLER_BREAK;
		}

		/* handle drop */
		if (event->type == EVT_DROP) {
			ui_but_drop(C, event, but, data);
		}
	}

	if (but->flag & UI_BUT_DISABLED) {
		return WM_UI_HANDLER_CONTINUE;
	}

	switch (but->type) {
		case UI_BTYPE_BUT:
			retval = ui_do_but_BUT(C, but, data, event);
			break;
		case UI_BTYPE_KEY_EVENT:
			retval = ui_do_but_KEYEVT(C, but, data, event);
			break;
		case UI_BTYPE_HOTKEY_EVENT:
			retval = ui_do_but_HOTKEYEVT(C, but, data, event);
			break;
		case UI_BTYPE_TAB:
			retval = ui_do_but_TAB(C, block, but, data, event);
			break;
		case UI_BTYPE_BUT_TOGGLE:
		case UI_BTYPE_TOGGLE:
		case UI_BTYPE_ICON_TOGGLE:
		case UI_BTYPE_ICON_TOGGLE_N:
		case UI_BTYPE_TOGGLE_N:
		case UI_BTYPE_CHECKBOX:
		case UI_BTYPE_CHECKBOX_N:
		case UI_BTYPE_ROW:
			retval = ui_do_but_TOG(C, but, data, event);
			break;
		case UI_BTYPE_SCROLL:
			retval = ui_do_but_SCROLL(C, block, but, data, event);
			break;
		case UI_BTYPE_GRIP:
			retval = ui_do_but_GRIP(C, block, but, data, event);
			break;
		case UI_BTYPE_NUM:
			retval = ui_do_but_NUM(C, block, but, data, event);
			break;
		case UI_BTYPE_NUM_SLIDER:
			retval = ui_do_but_SLI(C, block, but, data, event);
			break;
		case UI_BTYPE_LISTBOX:
			/* Nothing to do! */
			break;
		case UI_BTYPE_LISTROW:
			retval = ui_do_but_LISTROW(C, but, data, event);
			break;
		case UI_BTYPE_ROUNDBOX:
		case UI_BTYPE_LABEL:
		case UI_BTYPE_IMAGE:
		case UI_BTYPE_PROGRESS_BAR:
		case UI_BTYPE_NODE_SOCKET:
			retval = ui_do_but_EXIT(C, but, data, event);
			break;
		case UI_BTYPE_HISTOGRAM:
			retval = ui_do_but_HISTOGRAM(C, block, but, data, event);
			break;
		case UI_BTYPE_WAVEFORM:
			retval = ui_do_but_WAVEFORM(C, block, but, data, event);
			break;
		case UI_BTYPE_VECTORSCOPE:
			/* Nothing to do! */
			break;
		case UI_BTYPE_TEXT:
		case UI_BTYPE_SEARCH_MENU:
			if ((but->type == UI_BTYPE_SEARCH_MENU) &&
			    (but->flag & UI_BUT_VALUE_CLEAR))
			{
				retval = ui_do_but_SEARCH_UNLINK(C, block, but, data, event);
				if (retval & WM_UI_HANDLER_BREAK) {
					break;
				}
			}
			retval = ui_do_but_TEX(C, block, but, data, event);
			break;
		case UI_BTYPE_MENU:
		case UI_BTYPE_POPOVER:
		case UI_BTYPE_BLOCK:
		case UI_BTYPE_PULLDOWN:
			retval = ui_do_but_BLOCK(C, but, data, event);
			break;
		case UI_BTYPE_BUT_MENU:
			retval = ui_do_but_BUT(C, but, data, event);
			break;
		case UI_BTYPE_COLOR:
			if (but->a1 == -1)  /* signal to prevent calling up color picker */
				retval = ui_do_but_EXIT(C, but, data, event);
			else
				retval = ui_do_but_COLOR(C, but, data, event);
			break;
		case UI_BTYPE_UNITVEC:
			retval = ui_do_but_UNITVEC(C, block, but, data, event);
			break;
		case UI_BTYPE_COLORBAND:
			retval = ui_do_but_COLORBAND(C, block, but, data, event);
			break;
		case UI_BTYPE_CURVE:
			retval = ui_do_but_CURVE(C, block, but, data, event);
			break;
		case UI_BTYPE_HSVCUBE:
			retval = ui_do_but_HSVCUBE(C, block, but, data, event);
			break;
		case UI_BTYPE_HSVCIRCLE:
			retval = ui_do_but_HSVCIRCLE(C, block, but, data, event);
			break;
		case UI_BTYPE_TRACK_PREVIEW:
			retval = ui_do_but_TRACKPREVIEW(C, block, but, data, event);
			break;

			/* quiet warnings for unhandled types */
		case UI_BTYPE_SEPR:
		case UI_BTYPE_SEPR_LINE:
		case UI_BTYPE_SEPR_SPACER:
		case UI_BTYPE_EXTRA:
			break;
	}


	/* reset to default (generic function, only use if not handled by switch above) */
	/* XXX hardcoded keymap check.... */
	data = but->active;
	if (data && data->state == BUTTON_STATE_HIGHLIGHT) {
		if ((retval == WM_UI_HANDLER_CONTINUE) &&
		    (event->type == BACKSPACEKEY && event->val == KM_PRESS))
		{
			/* ctrl+backspace = reset active button; backspace = reset a whole array*/
			ui_but_default_set(C, !event->ctrl, true);
			ED_region_tag_redraw(data->region);
			retval = WM_UI_HANDLER_BREAK;
		}
	}

#ifdef USE_DRAG_MULTINUM
	if (data) {
		if (ELEM(event->type, MOUSEMOVE, INBETWEEN_MOUSEMOVE) ||
		    /* if we started dragging, progress on any event */
		    (data->multi_data.init == BUTTON_MULTI_INIT_SETUP))
		{
			if (ELEM(but->type, UI_BTYPE_NUM, UI_BTYPE_NUM_SLIDER) &&
			    ELEM(data->state, BUTTON_STATE_TEXT_EDITING, BUTTON_STATE_NUM_EDITING))
			{
				/* initialize! */
				if (data->multi_data.init == BUTTON_MULTI_INIT_UNSET) {
					/* --> (BUTTON_MULTI_INIT_SETUP | BUTTON_MULTI_INIT_DISABLE) */

					const float margin_y = DRAG_MULTINUM_THRESHOLD_DRAG_Y / sqrtf(block->aspect);

					/* check if we have a vertical gesture */
					if (len_squared_v2(data->multi_data.drag_dir) > (margin_y * margin_y)) {
						const float dir_nor_y[2] = {0.0, 1.0f};
						float dir_nor_drag[2];

						normalize_v2_v2(dir_nor_drag, data->multi_data.drag_dir);

						if (fabsf(dot_v2v2(dir_nor_drag, dir_nor_y)) > DRAG_MULTINUM_THRESHOLD_VERTICAL) {
							data->multi_data.init = BUTTON_MULTI_INIT_SETUP;
							data->multi_data.drag_lock_x = event->x;
						}
						else {
							data->multi_data.init = BUTTON_MULTI_INIT_DISABLE;
						}
					}
				}
				else if (data->multi_data.init == BUTTON_MULTI_INIT_SETUP) {
					/* --> (BUTTON_MULTI_INIT_ENABLE) */
					const float margin_x = DRAG_MULTINUM_THRESHOLD_DRAG_X / sqrtf(block->aspect);
					/* check if we're dont setting buttons */
					if ((data->str && ELEM(data->state, BUTTON_STATE_TEXT_EDITING, BUTTON_STATE_NUM_EDITING)) ||
					    ((abs(data->multi_data.drag_lock_x - event->x) > margin_x) &&
					     /* just to be sure, check we're dragging more hoz then virt */
					     abs(event->prevx - event->x) > abs(event->prevy - event->y)))
					{
						if (data->multi_data.has_mbuts) {
							ui_multibut_states_create(but, data);
							data->multi_data.init = BUTTON_MULTI_INIT_ENABLE;
						}
						else {
							data->multi_data.init = BUTTON_MULTI_INIT_DISABLE;
						}
					}
				}

				if (data->multi_data.init == BUTTON_MULTI_INIT_SETUP) {
					if (ui_multibut_states_tag(but, data, event)) {
						ED_region_tag_redraw(data->region);
					}
				}
			}
		}
	}
#endif  /* USE_DRAG_MULTINUM */

	return retval;
}

/* ************************ button utilities *********************** */

static bool ui_but_contains_pt(uiBut *but, float mx, float my)
{
	return BLI_rctf_isect_pt(&but->rect, mx, my);
}

void ui_but_pie_dir(RadialDirection dir, float vec[2])
{
	float angle;

	BLI_assert(dir != UI_RADIAL_NONE);

	angle = DEG2RADF((float)ui_radial_dir_to_angle[dir]);
	vec[0] = cosf(angle);
	vec[1] = sinf(angle);
}

static bool ui_but_isect_pie_seg(uiBlock *block, uiBut *but)
{
	const float angle_range = (block->pie_data.flags & UI_PIE_DEGREES_RANGE_LARGE) ? M_PI_4 : M_PI_4 / 2.0;
	float vec[2];

	if (block->pie_data.flags & UI_PIE_INVALID_DIR)
		return false;

	ui_but_pie_dir(but->pie_dir, vec);

	if (saacos(dot_v2v2(vec, block->pie_data.pie_dir)) < angle_range)
		return true;

	return false;
}

static bool ui_but_find_select_in_enum__cmp(const uiBut *but_a, const uiBut *but_b)
{
	return ((but_a->type == but_b->type) &&
	        (but_a->alignnr == but_b->alignnr) &&
	        (but_a->poin == but_b->poin) &&
	        (but_a->rnapoin.type == but_b->rnapoin.type) &&
	        (but_a->rnaprop == but_b->rnaprop));
}

/**
 * Finds the pressed button in an aligned row (typically an expanded enum).
 *
 * \param direction: Use when there may be multiple buttons pressed.
 */
uiBut *ui_but_find_select_in_enum(uiBut *but, int direction)
{
	uiBut *but_iter = but;
	uiBut *but_found = NULL;
	BLI_assert(ELEM(direction, -1, 1));

	while ((but_iter->prev) &&
	       ui_but_find_select_in_enum__cmp(but_iter->prev, but))
	{
		but_iter = but_iter->prev;
	}

	while (but_iter && ui_but_find_select_in_enum__cmp(but_iter, but)) {
		if (but_iter->flag & UI_SELECT) {
			but_found = but_iter;
			if (direction == 1) {
				break;
			}
		}
		but_iter = but_iter->next;
	}

	return but_found;
}

uiBut *ui_but_find_active_in_region(ARegion *ar)
{
	uiBlock *block;
	uiBut *but;

	for (block = ar->uiblocks.first; block; block = block->next)
		for (but = block->buttons.first; but; but = but->next)
			if (but->active)
				return but;

	return NULL;
}

bool ui_but_is_active(ARegion *ar)
{
	return (ui_but_find_active_in_region(ar) != NULL);
}

/* is called by notifier */
void UI_screen_free_active_but(const bContext *C, bScreen *screen)
{
	wmWindow *win = CTX_wm_window(C);

	ED_screen_areas_iter(win, screen, area) {
		for (ARegion *region = area->regionbase.first; region; region = region->next) {
			uiBut *but = ui_but_find_active_in_region(region);
			if (but) {
				uiHandleButtonData *data = but->active;

				if (data->menu == NULL && data->searchbox == NULL)
					if (data->state == BUTTON_STATE_HIGHLIGHT)
						ui_but_active_free(C, but);
			}
		}
	}
}



/* returns true if highlighted button allows drop of names */
/* called in region context */
bool UI_but_active_drop_name(bContext *C)
{
	ARegion *ar = CTX_wm_region(C);
	uiBut *but = ui_but_find_active_in_region(ar);

	if (but) {
		if (ELEM(but->type, UI_BTYPE_TEXT, UI_BTYPE_SEARCH_MENU))
			return 1;
	}

	return 0;
}

bool UI_but_active_drop_color(bContext *C)
{
	ARegion *ar = CTX_wm_region(C);

	if (ar) {
		uiBut *but = ui_but_find_active_in_region(ar);

		if (but && but->type == UI_BTYPE_COLOR)
			return true;
	}

	return false;
}

static void ui_blocks_set_tooltips(ARegion *ar, const bool enable)
{
	uiBlock *block;

	if (!ar)
		return;

	/* we disabled buttons when when they were already shown, and
	 * re-enable them on mouse move */
	for (block = ar->uiblocks.first; block; block = block->next)
		block->tooltipdisabled = !enable;
}

static bool ui_region_contains_point_px(ARegion *ar, int x, int y)
{
	rcti winrct;

	/* scale down area rect to exclude shadow */
	ui_region_winrct_get_no_margin(ar, &winrct);

	/* check if the mouse is in the region */
	if (!BLI_rcti_isect_pt(&winrct, x, y)) {
		for (uiBlock *block = ar->uiblocks.first; block; block = block->next)
			block->auto_open = false;

		return false;
	}

	/* also, check that with view2d, that the mouse is not over the scrollbars
	 * NOTE: care is needed here, since the mask rect may include the scrollbars
	 * even when they are not visible, so we need to make a copy of the mask to
	 * use to check
	 */
	if (ar->v2d.mask.xmin != ar->v2d.mask.xmax) {
		View2D *v2d = &ar->v2d;
		int mx, my;

		/* convert window coordinates to region coordinates */
		mx = x;
		my = y;
		ui_window_to_region(ar, &mx, &my);

		/* check if in the rect */
		if (!BLI_rcti_isect_pt(&v2d->mask, mx, my) || UI_view2d_mouse_in_scrollers(ar, &ar->v2d, x, y)) {
			return false;
		}
	}

	return true;
}

static bool ui_but_contains_point_px(ARegion *ar, uiBut *but, int x, int y)
{
	uiBlock *block = but->block;
	float mx, my;
	if (!ui_region_contains_point_px(ar, x, y))
		return false;

	mx = x;
	my = y;

	ui_window_to_block_fl(ar, block, &mx, &my);

	if (but->pie_dir != UI_RADIAL_NONE) {
		if (!ui_but_isect_pie_seg(block, but)) {
			return false;
		}
	}
	else if (!ui_but_contains_pt(but, mx, my)) {
		return false;
	}

	return true;
}

/**
 * Can we mouse over the button or is it hidden/disabled/layout.
 * \note ctrl is kind of a hack currently,
 * so that non-embossed UI_BTYPE_TEXT button behaves as a label when ctrl is not pressed.
 */
static bool ui_but_is_interactive(const uiBut *but, const bool labeledit)
{
	/* note, UI_BTYPE_LABEL is included for highlights, this allows drags */
	if ((but->type == UI_BTYPE_LABEL) && but->dragpoin == NULL)
		return false;
	if (ELEM(but->type, UI_BTYPE_ROUNDBOX, UI_BTYPE_SEPR, UI_BTYPE_SEPR_LINE, UI_BTYPE_LISTBOX))
		return false;
	if (but->flag & UI_HIDDEN)
		return false;
	if (but->flag & UI_SCROLLED)
		return false;
	if ((but->type == UI_BTYPE_TEXT) && (but->dt == UI_EMBOSS_NONE) && !labeledit)
		return false;
	if ((but->type == UI_BTYPE_LISTROW) && labeledit)
		return false;

	return true;
}

/* x and y are only used in case event is NULL... */
static uiBut *ui_but_find_mouse_over_ex(ARegion *ar, const int x, const int y, const bool labeledit)
{
	uiBlock *block;
	uiBut *but, *butover = NULL;
	float mx, my;

//	if (!win->active)
//		return NULL;
	if (!ui_region_contains_point_px(ar, x, y))
		return NULL;

	for (block = ar->uiblocks.first; block; block = block->next) {
		mx = x;
		my = y;
		ui_window_to_block_fl(ar, block, &mx, &my);

		for (but = block->buttons.last; but; but = but->prev) {
			if (ui_but_is_interactive(but, labeledit)) {
				if (but->pie_dir != UI_RADIAL_NONE) {
					if (ui_but_isect_pie_seg(block, but)) {
						butover = but;
						break;
					}
				}
				else if (ui_but_contains_pt(but, mx, my)) {
					butover = but;
					break;
				}
			}
		}

		/* CLIP_EVENTS prevents the event from reaching other blocks */
		if (block->flag & UI_BLOCK_CLIP_EVENTS) {
			/* check if mouse is inside block */
			if (BLI_rctf_isect_pt(&block->rect, mx, my)) {
				break;
			}
		}
	}

	return butover;
}

uiBut *ui_but_find_mouse_over(ARegion *ar, const wmEvent *event)
{
	return ui_but_find_mouse_over_ex(ar, event->x, event->y, event->ctrl != 0);
}


static uiBut *ui_list_find_mouse_over_ex(ARegion *ar, int x, int y)
{
	uiBlock *block;
	uiBut *but;
	float mx, my;

	if (!ui_region_contains_point_px(ar, x, y))
		return NULL;

	for (block = ar->uiblocks.first; block; block = block->next) {
		mx = x;
		my = y;
		ui_window_to_block_fl(ar, block, &mx, &my);

		for (but = block->buttons.last; but; but = but->prev) {
			if (but->type == UI_BTYPE_LISTBOX && ui_but_contains_pt(but, mx, my)) {
				return but;
			}
		}
	}

	return NULL;
}

static uiBut *ui_list_find_mouse_over(ARegion *ar, const wmEvent *event)
{
	return ui_list_find_mouse_over_ex(ar, event->x, event->y);
}

/* ****************** button state handling **************************/

static bool button_modal_state(uiHandleButtonState state)
{
	return ELEM(state,
	            BUTTON_STATE_WAIT_RELEASE,
	            BUTTON_STATE_WAIT_KEY_EVENT,
	            BUTTON_STATE_NUM_EDITING,
	            BUTTON_STATE_TEXT_EDITING,
	            BUTTON_STATE_TEXT_SELECTING,
	            BUTTON_STATE_MENU_OPEN);
}

/**
 * Recreate tooltip (use to update dynamic tips)
 */
void UI_but_tooltip_refresh(bContext *C, uiBut *but)
{
	uiHandleButtonData *data = but->active;
	if (data) {
		bScreen *sc = WM_window_get_active_screen(data->window);
		if (sc->tool_tip && sc->tool_tip->region) {
			WM_tooltip_refresh(C, data->window);
		}
	}
}

/* removes tooltip timer from active but (meaning tooltip is disabled until it's reenabled again) */
void UI_but_tooltip_timer_remove(bContext *C, uiBut *but)
{
	uiHandleButtonData *data;

	data = but->active;
	if (data) {
		if (data->autoopentimer) {
			WM_event_remove_timer(data->wm, data->window, data->autoopentimer);
			data->autoopentimer = NULL;
		}

		if (data->window) {
			WM_tooltip_clear(C, data->window);
		}
	}
}

static ARegion *ui_but_tooltip_init(
        bContext *C, ARegion *ar,
        int *pass, double *r_pass_delay, bool *r_exit_on_event)
{
	bool is_label = false;
	if (*pass == 1) {
		is_label = true;
		(*pass)--;
		(*r_pass_delay) = UI_TOOLTIP_DELAY - UI_TOOLTIP_DELAY_LABEL;
	}

	uiBut *but = UI_region_active_but_get(ar);
	*r_exit_on_event = false;
	if (but) {
		return UI_tooltip_create_from_button(C, ar, but, is_label);
	}
	return NULL;
}

static void button_tooltip_timer_reset(bContext *C, uiBut *but)
{
	wmWindowManager *wm = CTX_wm_manager(C);
	uiHandleButtonData *data = but->active;

	WM_tooltip_timer_clear(C, data->window);

	if ((U.flag & USER_TOOLTIPS) || (data->tooltip_force)) {
		if (!but->block->tooltipdisabled) {
			if (!wm->drags.first) {
				bool is_label = UI_but_has_tooltip_label(but);
				double delay = is_label ? UI_TOOLTIP_DELAY_LABEL : UI_TOOLTIP_DELAY;
				WM_tooltip_timer_init_ex(C, data->window, data->region, ui_but_tooltip_init, delay);
				if (is_label) {
					bScreen *sc = WM_window_get_active_screen(data->window);
					if (sc->tool_tip) {
						sc->tool_tip->pass = 1;
					}
				}
			}
		}
	}
}

static void button_activate_state(bContext *C, uiBut *but, uiHandleButtonState state)
{
	uiHandleButtonData *data;

	data = but->active;
	if (data->state == state)
		return;

	/* highlight has timers for tooltips and auto open */
	if (state == BUTTON_STATE_HIGHLIGHT) {
		but->flag &= ~UI_SELECT;

		button_tooltip_timer_reset(C, but);

		/* automatic open pulldown block timer */
		if (ELEM(but->type, UI_BTYPE_BLOCK, UI_BTYPE_PULLDOWN, UI_BTYPE_POPOVER)) {
			if (data->used_mouse && !data->autoopentimer) {
				int time;

				if (but->block->auto_open == true) {  /* test for toolbox */
					time = 1;
				}
				else if ((but->block->flag & UI_BLOCK_LOOP && but->type != UI_BTYPE_BLOCK) ||
				         (but->block->auto_open == true))
				{
					time = 5 * U.menuthreshold2;
				}
				else if (U.uiflag & USER_MENUOPENAUTO) {
					time = 5 * U.menuthreshold1;
				}
				else {
					time = -1;  /* do nothing */
				}

				if (time >= 0) {
					data->autoopentimer = WM_event_add_timer(data->wm, data->window, TIMER, 0.02 * (double)time);
				}
			}
		}
	}
	else {
		but->flag |= UI_SELECT;
		UI_but_tooltip_timer_remove(C, but);
	}

	/* text editing */
	if (state == BUTTON_STATE_TEXT_EDITING && data->state != BUTTON_STATE_TEXT_SELECTING)
		ui_textedit_begin(C, but, data);
	else if (data->state == BUTTON_STATE_TEXT_EDITING && state != BUTTON_STATE_TEXT_SELECTING)
		ui_textedit_end(C, but, data);
	else if (data->state == BUTTON_STATE_TEXT_SELECTING && state != BUTTON_STATE_TEXT_EDITING)
		ui_textedit_end(C, but, data);

	/* number editing */
	if (state == BUTTON_STATE_NUM_EDITING) {
		if (ui_but_is_cursor_warp(but))
			WM_cursor_grab_enable(CTX_wm_window(C), true, true, NULL);
		ui_numedit_begin(but, data);
	}
	else if (data->state == BUTTON_STATE_NUM_EDITING) {
		ui_numedit_end(but, data);

		if (but->flag & UI_BUT_DRIVEN) {
			/* Only warn when editing stepping/dragging the value.
			 * No warnings should show for editing driver expressions though!
			 */
			if (state != BUTTON_STATE_TEXT_EDITING) {
				WM_report(RPT_INFO, "Can't edit driven number value, see graph editor for the driver setup.");
			}
		}

		if (ui_but_is_cursor_warp(but)) {

#ifdef USE_CONT_MOUSE_CORRECT
			/* stereo3d has issues with changing cursor location so rather avoid */
			if (data->ungrab_mval[0] != FLT_MAX && !WM_stereo3d_enabled(data->window, false)) {
				int mouse_ungrab_xy[2];
				ui_block_to_window_fl(data->region, but->block, &data->ungrab_mval[0], &data->ungrab_mval[1]);
				mouse_ungrab_xy[0] = data->ungrab_mval[0];
				mouse_ungrab_xy[1] = data->ungrab_mval[1];

				WM_cursor_grab_disable(data->window, mouse_ungrab_xy);
			}
			else {
				WM_cursor_grab_disable(data->window, NULL);
			}
#else
			WM_cursor_grab_disable(data->window, NULL);
#endif
		}
	}
	/* menu open */
	if (state == BUTTON_STATE_MENU_OPEN)
		ui_block_open_begin(C, but, data);
	else if (data->state == BUTTON_STATE_MENU_OPEN)
		ui_block_open_end(C, but, data);

	/* add a short delay before exiting, to ensure there is some feedback */
	if (state == BUTTON_STATE_WAIT_FLASH) {
		data->flashtimer = WM_event_add_timer(data->wm, data->window, TIMER, BUTTON_FLASH_DELAY);
	}
	else if (data->flashtimer) {
		WM_event_remove_timer(data->wm, data->window, data->flashtimer);
		data->flashtimer = NULL;
	}

	/* add hold timer if it's used */
	if (state == BUTTON_STATE_WAIT_RELEASE && (but->hold_func != NULL)) {
		data->hold_action_timer = WM_event_add_timer(data->wm, data->window, TIMER, BUTTON_AUTO_OPEN_THRESH);
	}
	else if (data->hold_action_timer) {
		WM_event_remove_timer(data->wm, data->window, data->hold_action_timer);
		data->hold_action_timer = NULL;
	}

	/* add a blocking ui handler at the window handler for blocking, modal states
	 * but not for popups, because we already have a window level handler*/
	if (!(but->block->handle && but->block->handle->popup)) {
		if (button_modal_state(state)) {
			if (!button_modal_state(data->state))
				WM_event_add_ui_handler(C, &data->window->modalhandlers, ui_handler_region_menu, NULL, data, 0);
		}
		else {
			if (button_modal_state(data->state)) {
				/* true = postpone free */
				WM_event_remove_ui_handler(&data->window->modalhandlers, ui_handler_region_menu, NULL, data, true);
			}
		}
	}

	/* wait for mousemove to enable drag */
	if (state == BUTTON_STATE_WAIT_DRAG) {
		but->flag &= ~UI_SELECT;
	}

	data->state = state;

	if (state != BUTTON_STATE_EXIT) {
		/* When objects for eg. are removed, running ui_but_update() can access
		 * the removed data - so disable update on exit. Also in case of
		 * highlight when not in a popup menu, we remove because data used in
		 * button below popup might have been removed by action of popup. Needs
		 * a more reliable solution... */
		if (state != BUTTON_STATE_HIGHLIGHT || (but->block->flag & UI_BLOCK_LOOP))
			ui_but_update(but);
	}

	/* redraw */
	ED_region_tag_redraw(data->region);
}

static void button_activate_init(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type)
{
	uiHandleButtonData *data;

	/* setup struct */
	data = MEM_callocN(sizeof(uiHandleButtonData), "uiHandleButtonData");
	data->wm = CTX_wm_manager(C);
	data->window = CTX_wm_window(C);
	data->region = ar;

#ifdef USE_CONT_MOUSE_CORRECT
	copy_v2_fl(data->ungrab_mval, FLT_MAX);
#endif

	if (ELEM(but->type, UI_BTYPE_CURVE, UI_BTYPE_SEARCH_MENU)) {
		/* XXX curve is temp */
	}
	else {
		if ((but->flag & UI_BUT_UPDATE_DELAY) == 0) {
			data->interactive = true;
		}
	}

	data->state = BUTTON_STATE_INIT;

	/* activate button */
	but->flag |= UI_ACTIVE;

	but->active = data;

	/* we disable auto_open in the block after a threshold, because we still
	 * want to allow auto opening adjacent menus even if no button is activated
	 * in between going over to the other button, but only for a short while */
	if (type == BUTTON_ACTIVATE_OVER && but->block->auto_open == true)
		if (but->block->auto_open_last + BUTTON_AUTO_OPEN_THRESH < PIL_check_seconds_timer())
			but->block->auto_open = false;

	if (type == BUTTON_ACTIVATE_OVER) {
		data->used_mouse = true;
	}
	button_activate_state(C, but, BUTTON_STATE_HIGHLIGHT);

	/* activate right away */
	if (but->flag & UI_BUT_IMMEDIATE) {
		if (but->type == UI_BTYPE_HOTKEY_EVENT)
			button_activate_state(C, but, BUTTON_STATE_WAIT_KEY_EVENT);
		/* .. more to be added here */
	}

	if (type == BUTTON_ACTIVATE_OPEN) {
		button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);

		/* activate first button in submenu */
		if (data->menu && data->menu->region) {
			ARegion *subar = data->menu->region;
			uiBlock *subblock = subar->uiblocks.first;
			uiBut *subbut;

			if (subblock) {
				subbut = ui_but_first(subblock);

				if (subbut)
					ui_handle_button_activate(C, subar, subbut, BUTTON_ACTIVATE);
			}
		}
	}
	else if (type == BUTTON_ACTIVATE_TEXT_EDITING)
		button_activate_state(C, but, BUTTON_STATE_TEXT_EDITING);
	else if (type == BUTTON_ACTIVATE_APPLY)
		button_activate_state(C, but, BUTTON_STATE_WAIT_FLASH);

	if (but->type == UI_BTYPE_GRIP) {
		const bool horizontal = (BLI_rctf_size_x(&but->rect) < BLI_rctf_size_y(&but->rect));
		WM_cursor_modal_set(data->window, horizontal ? CURSOR_X_MOVE : CURSOR_Y_MOVE);
	}
	else if (but->type == UI_BTYPE_NUM) {
		ui_numedit_set_active(but);
	}

	if (UI_but_has_tooltip_label(but)) {
		/* Show a label for this button. */
		bScreen *sc = WM_window_get_active_screen(data->window);
		if ((PIL_check_seconds_timer() - WM_tooltip_time_closed()) < 0.1) {
			WM_tooltip_immediate_init(
			        C, CTX_wm_window(C), ar,
			        ui_but_tooltip_init);
			if (sc->tool_tip) {
				sc->tool_tip->pass = 1;
			}
		}
	}
}

static void button_activate_exit(
        bContext *C, uiBut *but, uiHandleButtonData *data,
        const bool mousemove, const bool onfree)
{
	uiBlock *block = but->block;
	uiBut *bt;

	if (but->type == UI_BTYPE_GRIP) {
		WM_cursor_modal_restore(data->window);
	}

	/* ensure we are in the exit state */
	if (data->state != BUTTON_STATE_EXIT)
		button_activate_state(C, but, BUTTON_STATE_EXIT);

	/* apply the button action or value */
	if (!onfree)
		ui_apply_but(C, block, but, data, false);

#ifdef USE_DRAG_MULTINUM
	if (data->multi_data.has_mbuts) {
		for (bt = block->buttons.first; bt; bt = bt->next) {
			if (bt->flag & UI_BUT_DRAG_MULTI) {
				bt->flag &= ~UI_BUT_DRAG_MULTI;

				if (!data->cancel) {
					ui_apply_but_autokey(C, bt);
				}
			}
		}

		ui_multibut_free(data, block);
	}
#endif

	/* if this button is in a menu, this will set the button return
	 * value to the button value and the menu return value to ok, the
	 * menu return value will be picked up and the menu will close */
	if (block->handle && !(block->flag & UI_BLOCK_KEEP_OPEN)) {
		if (!data->cancel || data->escapecancel) {
			uiPopupBlockHandle *menu;

			menu = block->handle;
			menu->butretval = data->retval;
			menu->menuretval = (data->cancel) ? UI_RETURN_CANCEL : UI_RETURN_OK;
		}
	}

	if (!onfree && !data->cancel) {
		/* autokey & undo push */
		ui_apply_but_undo(but);
		ui_apply_but_autokey(C, but);

#ifdef USE_ALLSELECT
		{
			/* only RNA from this button is used */
			uiBut but_temp = *but;
			uiSelectContextStore  *selctx_data = &data->select_others;
			for (int i = 0; i < selctx_data->elems_len; i++) {
				uiSelectContextElem *other = &selctx_data->elems[i];
				but_temp.rnapoin = other->ptr;
				ui_apply_but_autokey(C, &but_temp);
			}
		}
#endif

		/* popup menu memory */
		if (block->flag & UI_BLOCK_POPUP_MEMORY)
			ui_popup_menu_memory_set(block, but);
	}

	/* disable tooltips until mousemove + last active flag */
	for (block = data->region->uiblocks.first; block; block = block->next) {
		for (bt = block->buttons.first; bt; bt = bt->next)
			bt->flag &= ~UI_BUT_LAST_ACTIVE;

		block->tooltipdisabled = 1;
	}

	ui_blocks_set_tooltips(data->region, false);

	/* clean up */
	if (data->str)
		MEM_freeN(data->str);
	if (data->origstr)
		MEM_freeN(data->origstr);

#ifdef USE_ALLSELECT
	ui_selectcontext_end(but, &data->select_others);
#endif

	if (data->changed_cursor) {
		WM_cursor_modal_restore(data->window);
	}

	/* redraw and refresh (for popups) */
	ED_region_tag_redraw(data->region);
	ED_region_tag_refresh_ui(data->region);

	/* clean up button */
	if (but->active) {
		MEM_freeN(but->active);
		but->active = NULL;
	}

	but->flag &= ~(UI_ACTIVE | UI_SELECT);
	but->flag |= UI_BUT_LAST_ACTIVE;
	if (!onfree)
		ui_but_update(but);

	/* adds empty mousemove in queue for re-init handler, in case mouse is
	 * still over a button. We cannot just check for this ourselves because
	 * at this point the mouse may be over a button in another region */
	if (mousemove)
		WM_event_add_mousemove(C);
}

void ui_but_active_free(const bContext *C, uiBut *but)
{
	uiHandleButtonData *data;

	/* this gets called when the button somehow disappears while it is still
	 * active, this is bad for user interaction, but we need to handle this
	 * case cleanly anyway in case it happens */
	if (but->active) {
		data = but->active;
		data->cancel = true;
		button_activate_exit((bContext *)C, but, data, false, true);
	}
}

/* returns the active button with an optional checking function */
static uiBut *ui_context_button_active(ARegion *ar, bool (*but_check_cb)(uiBut *))
{
	uiBut *but_found = NULL;

	while (ar) {
		uiBlock *block;
		uiBut *but, *activebut = NULL;

		/* find active button */
		for (block = ar->uiblocks.first; block; block = block->next) {
			for (but = block->buttons.first; but; but = but->next) {
				if (but->active)
					activebut = but;
				else if (!activebut && (but->flag & UI_BUT_LAST_ACTIVE))
					activebut = but;
			}
		}

		if (activebut && (but_check_cb == NULL || but_check_cb(activebut))) {
			uiHandleButtonData *data = activebut->active;

			but_found = activebut;

			/* recurse into opened menu, like colorpicker case */
			if (data && data->menu && (ar != data->menu->region)) {
				ar = data->menu->region;
			}
			else {
				return but_found;
			}
		}
		else {
			/* no active button */
			return but_found;
		}
	}

	return but_found;
}

static bool ui_context_rna_button_active_test(uiBut *but)
{
	return (but->rnapoin.data != NULL);
}
static uiBut *ui_context_rna_button_active(const bContext *C)
{
	return ui_context_button_active(CTX_wm_region(C), ui_context_rna_button_active_test);
}

uiBut *UI_context_active_but_get(const struct bContext *C)
{
	return ui_context_button_active(CTX_wm_region(C), NULL);
}

uiBut *UI_region_active_but_get(ARegion *ar)
{
	return ui_context_button_active(ar, NULL);
}

/**
 * Version of #UI_context_active_but_get that also returns RNA property info.
 * Helper function for insert keyframe, reset to default, etc operators.
 *
 * \return active button, NULL if none found or if it doesn't contain valid RNA data.
 */
uiBut *UI_context_active_but_prop_get(
        const bContext *C,
        struct PointerRNA *r_ptr, struct PropertyRNA **r_prop, int *r_index)
{
	uiBut *activebut = ui_context_rna_button_active(C);

	if (activebut && activebut->rnapoin.data) {
		*r_ptr = activebut->rnapoin;
		*r_prop = activebut->rnaprop;
		*r_index = activebut->rnaindex;
	}
	else {
		memset(r_ptr, 0, sizeof(*r_ptr));
		*r_prop = NULL;
		*r_index = 0;
	}

	return activebut;
}

void UI_context_active_but_prop_handle(bContext *C)
{
	uiBut *activebut = ui_context_rna_button_active(C);
	if (activebut) {
		/* TODO, look into a better way to handle the button change
		 * currently this is mainly so reset defaults works for the
		 * operator redo panel - campbell */
		uiBlock *block = activebut->block;
		if (block->handle_func) {
			block->handle_func(C, block->handle_func_arg, activebut->retval);
		}
	}
}

wmOperator *UI_context_active_operator_get(const struct bContext *C)
{
	ARegion *ar_ctx = CTX_wm_region(C);
	uiBlock *block;

	/* background mode */
	if (ar_ctx == NULL) {
		return NULL;
	}

	/* scan active regions ui */
	for (block = ar_ctx->uiblocks.first; block; block = block->next) {
		if (block->ui_operator) {
			return block->ui_operator;
		}
	}

	/* scan popups */
	{
		bScreen *sc = CTX_wm_screen(C);
		ARegion *ar;

		for (ar = sc->regionbase.first; ar; ar = ar->next) {
			if (ar == ar_ctx) {
				continue;
			}
			for (block = ar->uiblocks.first; block; block = block->next) {
				if (block->ui_operator) {
					return block->ui_operator;
				}
			}
		}
	}

	return NULL;
}

/* helper function for insert keyframe, reset to default, etc operators */
void UI_context_update_anim_flag(const bContext *C)
{
	Scene *scene = CTX_data_scene(C);
	ARegion *ar = CTX_wm_region(C);
	uiBlock *block;
	uiBut *but, *activebut;

	while (ar) {
		/* find active button */
		activebut = NULL;

		for (block = ar->uiblocks.first; block; block = block->next) {
			for (but = block->buttons.first; but; but = but->next) {
				ui_but_anim_flag(but, (scene) ? scene->r.cfra : 0.0f);
				ui_but_override_flag(but);
				if (UI_but_is_decorator(but)) {
					ui_but_anim_decorate_update_from_flag(but);
				}

				ED_region_tag_redraw(ar);

				if (but->active) {
					activebut = but;
				}
				else if (!activebut && (but->flag & UI_BUT_LAST_ACTIVE)) {
					activebut = but;
				}
			}
		}

		if (activebut) {
			/* always recurse into opened menu, so all buttons update (like colorpicker) */
			uiHandleButtonData *data = activebut->active;
			if (data && data->menu) {
				ar = data->menu->region;
			}
			else {
				return;
			}
		}
		else {
			/* no active button */
			return;
		}
	}
}

/************** handle activating a button *************/

static uiBut *ui_but_find_open_event(ARegion *ar, const wmEvent *event)
{
	uiBlock *block;
	uiBut *but;

	for (block = ar->uiblocks.first; block; block = block->next) {
		for (but = block->buttons.first; but; but = but->next)
			if (but == event->customdata)
				return but;
	}
	return NULL;
}

static int ui_handle_button_over(bContext *C, const wmEvent *event, ARegion *ar)
{
	uiBut *but;

	if (event->type == MOUSEMOVE) {
		but = ui_but_find_mouse_over(ar, event);
		if (but) {
			button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);

			if (event->alt && but->active) {
				/* display tooltips if holding alt on mouseover when tooltips are off in prefs */
				but->active->tooltip_force = true;
			}
		}
	}
	else if (event->type == EVT_BUT_OPEN) {
		but = ui_but_find_open_event(ar, event);
		if (but) {
			button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
			ui_do_button(C, but->block, but, event);
		}
	}

	return WM_UI_HANDLER_CONTINUE;
}

/* exported to interface.c: UI_but_active_only() */
void ui_but_activate_event(bContext *C, ARegion *ar, uiBut *but)
{
	wmWindow *win = CTX_wm_window(C);
	wmEvent event;

	button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);

	wm_event_init_from_window(win, &event);
	event.type = EVT_BUT_OPEN;
	event.val = KM_PRESS;
	event.customdata = but;
	event.customdatafree = false;

	ui_do_button(C, but->block, but, &event);
}

/**
 * Simulate moving the mouse over a button (or navigating to it with arrow keys).
 *
 * exported so menus can start with a highlighted button,
 * even if the mouse isnt over it
 */
void ui_but_activate_over(bContext *C, ARegion *ar, uiBut *but)
{
	button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
}

void ui_but_execute_begin(struct bContext *UNUSED(C), struct ARegion *ar, uiBut *but, void **active_back)
{
	/* note: ideally we would not have to change 'but->active' however
	 * some functions we call don't use data (as they should be doing) */
	uiHandleButtonData *data;
	*active_back = but->active;
	data = MEM_callocN(sizeof(uiHandleButtonData), "uiHandleButtonData_Fake");
	but->active = data;
	data->region = ar;
}

void ui_but_execute_end(struct bContext *C, struct ARegion *UNUSED(ar), uiBut *but, void *active_back)
{
	ui_apply_but(C, but->block, but, but->active, true);

	if ((but->flag & UI_BUT_DRAG_MULTI) == 0) {
		ui_apply_but_autokey(C, but);
	}
	/* use onfree event so undo is handled by caller and apply is already done above */
	button_activate_exit((bContext *)C, but, but->active, false, true);
	but->active = active_back;
}

static void ui_handle_button_activate(bContext *C, ARegion *ar, uiBut *but, uiButtonActivateType type)
{
	uiBut *oldbut;
	uiHandleButtonData *data;

	oldbut = ui_but_find_active_in_region(ar);
	if (oldbut) {
		data = oldbut->active;
		data->cancel = true;
		button_activate_exit(C, oldbut, data, false, false);
	}

	button_activate_init(C, ar, but, type);
}

/************ handle events for an activated button ***********/

static bool ui_button_value_default(uiBut *but, double *r_value)
{
	if (but->rnaprop != NULL && ui_but_is_rna_valid(but)) {
		int type = RNA_property_type(but->rnaprop);
		if (ELEM(type, PROP_FLOAT, PROP_INT)) {
			double default_value;
			switch (type) {
				case PROP_INT:
					if (RNA_property_array_check(but->rnaprop)) {
						default_value = (double)RNA_property_int_get_default_index(&but->rnapoin, but->rnaprop, but->rnaindex);
					}
					else {
						default_value = (double)RNA_property_int_get_default(&but->rnapoin, but->rnaprop);
					}
					break;
				case PROP_FLOAT:
					if (RNA_property_array_check(but->rnaprop)) {
						default_value = (double)RNA_property_float_get_default_index(&but->rnapoin, but->rnaprop, but->rnaindex);
					}
					else {
						default_value = (double)RNA_property_float_get_default(&but->rnapoin, but->rnaprop);
					}
					break;
			}
			*r_value = default_value;
			return true;
		}
	}
	return false;
}

static int ui_handle_button_event(bContext *C, const wmEvent *event, uiBut *but)
{
	uiHandleButtonData *data = but->active;
	const uiHandleButtonState state_orig = data->state;
	uiBlock *block;
	ARegion *ar;
	int retval;

	block = but->block;
	ar = data->region;

	retval = WM_UI_HANDLER_CONTINUE;

	if (data->state == BUTTON_STATE_HIGHLIGHT) {
		switch (event->type) {
			case WINDEACTIVATE:
			case EVT_BUT_CANCEL:
				data->cancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				break;
#ifdef USE_UI_POPOVER_ONCE
			case LEFTMOUSE:
			{
				if (event->val == KM_RELEASE) {
					if (block->flag & UI_BLOCK_POPOVER_ONCE) {
						if (!(but->flag & UI_BUT_DISABLED)) {
							if (ui_but_is_popover_once_compat(but)) {
								data->cancel = false;
								button_activate_state(C, but, BUTTON_STATE_EXIT);
								retval = WM_UI_HANDLER_BREAK;
								block->handle->menuretval = UI_RETURN_OK;
							}
							else if (ui_but_is_editable_as_text(but)) {
								ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_TEXT_EDITING);
								retval = WM_UI_HANDLER_BREAK;
							}
						}
					}
				}
				break;
			}
#endif
			case MOUSEMOVE:
			{
				uiBut *but_other = ui_but_find_mouse_over(ar, event);
				bool exit = false;

				/* always deactivate button for pie menus, else moving to blank space will leave activated */
				if ((!ui_block_is_menu(block) || ui_block_is_pie_menu(block)) &&
				    !ui_but_contains_point_px(ar, but, event->x, event->y))
				{
					exit = true;
				}
				else if (but_other && ui_but_is_editable(but_other) && (but_other != but)) {
					exit = true;
				}

				if (exit) {
					data->cancel = true;
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				else if (event->x != event->prevx || event->y != event->prevy) {
					/* re-enable tooltip on mouse move */
					ui_blocks_set_tooltips(ar, true);
					button_tooltip_timer_reset(C, but);
				}

				break;
			}
			case TIMER:
			{
				/* handle menu auto open timer */
				if (event->customdata == data->autoopentimer) {
					WM_event_remove_timer(data->wm, data->window, data->autoopentimer);
					data->autoopentimer = NULL;

					if (ui_but_contains_point_px(ar, but, event->x, event->y))
						button_activate_state(C, but, BUTTON_STATE_MENU_OPEN);
				}

				break;
			}
			/* XXX hardcoded keymap check... but anyway, while view changes, tooltips should be removed */
			case WHEELUPMOUSE:
			case WHEELDOWNMOUSE:
			case MIDDLEMOUSE:
			case MOUSEPAN:
				UI_but_tooltip_timer_remove(C, but);
				ATTR_FALLTHROUGH;
			default:
				break;
		}

		/* handle button type specific events */
		retval = ui_do_button(C, block, but, event);
	}
	else if (data->state == BUTTON_STATE_WAIT_RELEASE) {
		switch (event->type) {
			case WINDEACTIVATE:
				data->cancel = true;
				button_activate_state(C, but, BUTTON_STATE_EXIT);
				break;

			case TIMER:
			{
				if (event->customdata == data->hold_action_timer) {
					if (true) {
						data->cancel = true;
						button_activate_state(C, but, BUTTON_STATE_EXIT);
					}
					else {
						/* Do this so we can still mouse-up, closing the menu and running the button.
						 * This is nice to support but there are times when the button gets left pressed.
						 * Keep disavled for now. */
						WM_event_remove_timer(data->wm, data->window, data->hold_action_timer);
						data->hold_action_timer = NULL;
					}
					retval = WM_UI_HANDLER_CONTINUE;
					but->hold_func(C, data->region, but);
				}
				break;
			}
			case MOUSEMOVE:
			{
				/* deselect the button when moving the mouse away */
				/* also de-activate for buttons that only show highlights */
				if (ui_but_contains_point_px(ar, but, event->x, event->y)) {

					/* Drag on a hold button (used in the toolbar) now opens it immediately. */
					if (data->hold_action_timer) {
						if (but->flag & UI_SELECT) {
							if ((abs(event->x - event->prevx)) > 2 ||
							    (abs(event->y - event->prevy)) > 2)
							{
								WM_event_remove_timer(data->wm, data->window, data->hold_action_timer);
								data->hold_action_timer = WM_event_add_timer(data->wm, data->window, TIMER, 0.0f);
							}
						}
					}

					if (!(but->flag & UI_SELECT)) {
						but->flag |= (UI_SELECT | UI_ACTIVE);
						data->cancel = false;
						ED_region_tag_redraw(data->region);
					}
				}
				else {
					if (but->flag & UI_SELECT) {
						but->flag &= ~(UI_SELECT | UI_ACTIVE);
						data->cancel = true;
						ED_region_tag_redraw(data->region);
					}
				}
				break;
			}
			default:
				/* otherwise catch mouse release event */
				ui_do_button(C, block, but, event);
				break;
		}

		retval = WM_UI_HANDLER_BREAK;
	}
	else if (data->state == BUTTON_STATE_WAIT_FLASH) {
		switch (event->type) {
			case TIMER:
			{
				if (event->customdata == data->flashtimer) {
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				break;
			}
		}

		retval = WM_UI_HANDLER_CONTINUE;
	}
	else if (data->state == BUTTON_STATE_MENU_OPEN) {
		/* check for exit because of mouse-over another button */
		switch (event->type) {
			case MOUSEMOVE:
			{
				uiBut *bt;

				if (data->menu && data->menu->region) {
					if (ui_region_contains_point_px(data->menu->region, event->x, event->y)) {
						break;
					}
				}

				bt = ui_but_find_mouse_over(ar, event);

				if (bt && bt->active != data) {
					if (but->type != UI_BTYPE_COLOR) {  /* exception */
						data->cancel = true;
					}
					button_activate_state(C, but, BUTTON_STATE_EXIT);
				}
				break;
			}
		}

		ui_do_button(C, block, but, event);
		retval = WM_UI_HANDLER_CONTINUE;
	}
	else {
		retval = ui_do_button(C, block, but, event);
		// retval = WM_UI_HANDLER_BREAK; XXX why ?
	}

	/* may have been re-allocated above (eyedropper for eg) */
	data = but->active;
	if (data && data->state == BUTTON_STATE_EXIT) {
		uiBut *post_but = data->postbut;
		uiButtonActivateType post_type = data->posttype;

		/* Reset the button value when empty text is typed. */
		if ((data->cancel == false) && (data->str != NULL) && (data->str[0] == '\0') &&
		    (but->rnaprop && ELEM(RNA_property_type(but->rnaprop), PROP_FLOAT, PROP_INT)))
		{
			MEM_SAFE_FREE(data->str);
			ui_button_value_default(but, &data->value);

#ifdef USE_DRAG_MULTINUM
			if (data->multi_data.mbuts) {
				for (LinkNode *l = data->multi_data.mbuts; l; l = l->next) {
					uiButMultiState *state = l->link;
					uiBut *but_iter = state->but;
					double default_value;

					if (ui_button_value_default(but_iter, &default_value)) {
						ui_but_value_set(but_iter, default_value);
					}
				}
			}
			data->multi_data.skip = true;
#endif
		}

		button_activate_exit(C, but, data, (post_but == NULL), false);

		/* for jumping to the next button with tab while text editing */
		if (post_but) {
			button_activate_init(C, ar, post_but, post_type);
		}
		else {
			/* XXX issue is because WM_event_add_mousemove(C) is a bad hack and not reliable,
			 * if that gets coded better this bypass can go away too.
			 *
			 * This is needed to make sure if a button was active,
			 * it stays active while the mouse is over it.
			 * This avoids adding mousemoves, see: [#33466] */
			if (ELEM(state_orig, BUTTON_STATE_INIT, BUTTON_STATE_HIGHLIGHT)) {
				if (ui_but_find_mouse_over(ar, event) == but) {
					button_activate_init(C, ar, but, BUTTON_ACTIVATE_OVER);
				}
			}
		}
	}

	return retval;
}

static int ui_handle_list_event(bContext *C, const wmEvent *event, ARegion *ar, uiBut *listbox)
{
	uiList *ui_list;
	uiListDyn *dyn_data;
	int retval = WM_UI_HANDLER_CONTINUE;
	int type = event->type, val = event->val;
	bool redraw = false;
	int mx, my;

	ui_list = listbox->custom_data;
	if (!ui_list || !ui_list->dyn_data) {
		return retval;
	}
	dyn_data = ui_list->dyn_data;

	mx = event->x;
	my = event->y;
	ui_window_to_block(ar, listbox->block, &mx, &my);

	/* convert pan to scrollwheel */
	if (type == MOUSEPAN) {
		ui_pan_to_scroll(event, &type, &val);

		/* if type still is mousepan, we call it handled, since delta-y accumulate */
		/* also see wm_event_system.c do_wheel_ui hack */
		if (type == MOUSEPAN)
			retval = WM_UI_HANDLER_BREAK;
	}

	if (val == KM_PRESS) {
		if ((ELEM(type, UPARROWKEY, DOWNARROWKEY) && !IS_EVENT_MOD(event, shift, ctrl, alt, oskey)) ||
		    ((ELEM(type, WHEELUPMOUSE, WHEELDOWNMOUSE) && event->ctrl && !IS_EVENT_MOD(event, shift, alt, oskey))))
		{
			const int value_orig = RNA_property_int_get(&listbox->rnapoin, listbox->rnaprop);
			int value, min, max, inc;

			/* activate up/down the list */
			value = value_orig;
			if ((ui_list->filter_sort_flag & UILST_FLT_SORT_REVERSE) != 0) {
				inc = ELEM(type, UPARROWKEY, WHEELUPMOUSE) ? 1 : -1;
			}
			else {
				inc = ELEM(type, UPARROWKEY, WHEELUPMOUSE) ? -1 : 1;
			}

			if (dyn_data->items_filter_neworder || dyn_data->items_filter_flags) {
				/* If we have a display order different from collection order, we have some work! */
				int *org_order = MEM_mallocN(dyn_data->items_shown * sizeof(int), __func__);
				const int *new_order = dyn_data->items_filter_neworder;
				int i, org_idx = -1, len = dyn_data->items_len;
				int current_idx = -1;
				int filter_exclude = ui_list->filter_flag & UILST_FLT_EXCLUDE;

				for (i = 0; i < len; i++) {
					if (!dyn_data->items_filter_flags ||
					    ((dyn_data->items_filter_flags[i] & UILST_FLT_ITEM) ^ filter_exclude))
					{
						org_order[new_order ? new_order[++org_idx] : ++org_idx] = i;
						if (i == value) {
							current_idx = new_order ? new_order[org_idx] : org_idx;
						}
					}
					else if (i == value && org_idx >= 0) {
						current_idx = -(new_order ? new_order[org_idx] : org_idx) - 1;
					}
				}
				/* Now, org_order maps displayed indices to real indices,
				 * and current_idx either contains the displayed index of active value (positive),
				 *                 or its more-nearest one (negated).
				 */
				if (current_idx < 0) {
					current_idx = (current_idx * -1) + (inc < 0 ? inc : inc - 1);
				}
				else {
					current_idx += inc;
				}
				CLAMP(current_idx, 0, dyn_data->items_shown - 1);
				value = org_order[current_idx];
				MEM_freeN(org_order);
			}
			else {
				value += inc;
			}

			CLAMP(value, 0, dyn_data->items_len - 1);

			RNA_property_int_range(&listbox->rnapoin, listbox->rnaprop, &min, &max);
			CLAMP(value, min, max);

			if (value != value_orig) {
				RNA_property_int_set(&listbox->rnapoin, listbox->rnaprop, value);
				RNA_property_update(C, &listbox->rnapoin, listbox->rnaprop);

				ui_apply_but_undo(listbox);

				ui_list->flag |= UILST_SCROLL_TO_ACTIVE_ITEM;
				redraw = true;
			}
			retval = WM_UI_HANDLER_BREAK;
		}
		else if (ELEM(type, WHEELUPMOUSE, WHEELDOWNMOUSE) && event->shift) {
			/* We now have proper grip, but keep this anyway! */
			if (ui_list->list_grip < (dyn_data->visual_height_min - UI_LIST_AUTO_SIZE_THRESHOLD)) {
				ui_list->list_grip = dyn_data->visual_height;
			}
			ui_list->list_grip += (type == WHEELUPMOUSE) ? -1 : 1;

			ui_list->flag |= UILST_SCROLL_TO_ACTIVE_ITEM;

			redraw = true;
			retval = WM_UI_HANDLER_BREAK;
		}
		else if (ELEM(type, WHEELUPMOUSE, WHEELDOWNMOUSE)) {
			if (dyn_data->height > dyn_data->visual_height) {
				/* list template will clamp */
				ui_list->list_scroll += (type == WHEELUPMOUSE) ? -1 : 1;

				redraw = true;
				retval = WM_UI_HANDLER_BREAK;
			}
		}
	}

	if (redraw) {
		ED_region_tag_redraw(ar);
		ED_region_tag_refresh_ui(ar);
	}

	return retval;
}

static void ui_handle_button_return_submenu(bContext *C, const wmEvent *event, uiBut *but)
{
	uiHandleButtonData *data;
	uiPopupBlockHandle *menu;

	data = but->active;
	menu = data->menu;

	/* copy over return values from the closing menu */
	if ((menu->menuretval & UI_RETURN_OK) || (menu->menuretval & UI_RETURN_UPDATE)) {
		if (but->type == UI_BTYPE_COLOR)
			copy_v3_v3(data->vec, menu->retvec);
		else if (but->type == UI_BTYPE_MENU)
			data->value = menu->retvalue;
	}

	if (menu->menuretval & UI_RETURN_UPDATE) {
		if (data->interactive) {
			ui_apply_but(C, but->block, but, data, true);
		}
		else {
			ui_but_update(but);
		}

		menu->menuretval = 0;
	}

	/* now change button state or exit, which will close the submenu */
	if ((menu->menuretval & UI_RETURN_OK) || (menu->menuretval & UI_RETURN_CANCEL)) {
		if (menu->menuretval != UI_RETURN_OK)
			data->cancel = true;

		button_activate_exit(C, but, data, true, false);
	}
	else if (menu->menuretval & UI_RETURN_OUT) {
		if (event->type == MOUSEMOVE && ui_but_contains_point_px(data->region, but, event->x, event->y)) {
			button_activate_state(C, but, BUTTON_STATE_HIGHLIGHT);
		}
		else {
			if (ISKEYBOARD(event->type)) {
				/* keyboard menu hierarchy navigation, going back to previous level */
				but->active->used_mouse = false;
				button_activate_state(C, but, BUTTON_STATE_HIGHLIGHT);
			}
			else {
				data->cancel = true;
				button_activate_exit(C, but, data, true, false);
			}
		}
	}
}

/* ************************* menu handling *******************************/

/**
 * Function used to prevent losing the open menu when using nested pulldowns,
 * when moving mouse towards the pulldown menu over other buttons that could
 * steal the highlight from the current button, only checks:
 *
 * - while mouse moves in triangular area defined old mouse position and
 *   left/right side of new menu.
 * - only for 1 second.
 */

static void ui_mouse_motion_towards_init_ex(uiPopupBlockHandle *menu, const int xy[2], const bool force)
{
	BLI_assert(((uiBlock *)menu->region->uiblocks.first)->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER));

	if (!menu->dotowards || force) {
		menu->dotowards = true;
		menu->towards_xy[0] = xy[0];
		menu->towards_xy[1] = xy[1];

		if (force)
			menu->towardstime = DBL_MAX;  /* unlimited time */
		else
			menu->towardstime = PIL_check_seconds_timer();
	}
}

static void ui_mouse_motion_towards_init(uiPopupBlockHandle *menu, const int xy[2])
{
	ui_mouse_motion_towards_init_ex(menu, xy, false);
}

static void ui_mouse_motion_towards_reinit(uiPopupBlockHandle *menu, const int xy[2])
{
	ui_mouse_motion_towards_init_ex(menu, xy, true);
}

static bool ui_mouse_motion_towards_check(
        uiBlock *block, uiPopupBlockHandle *menu, const int xy[2],
        const bool use_wiggle_room)
{
	float p1[2], p2[2], p3[2], p4[2];
	float oldp[2] = {menu->towards_xy[0], menu->towards_xy[1]};
	const float newp[2] = {xy[0], xy[1]};
	bool closer;
	const float margin = MENU_TOWARDS_MARGIN;
	rctf rect_px;

	BLI_assert(block->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER));


	/* annoying fix for [#36269], this is a bit odd but in fact works quite well
	 * don't mouse-out of a menu if another menu has been created after it.
	 * if this causes problems we could remove it and check on a different fix - campbell */
	if (menu->region->next) {
		/* am I the last menu (test) */
		ARegion *ar = menu->region->next;
		do {
			uiBlock *block_iter = ar->uiblocks.first;
			if (block_iter && ui_block_is_menu(block_iter)) {
				return true;
			}
		} while ((ar = ar->next));
	}
	/* annoying fix end! */


	if (!menu->dotowards) {
		return false;
	}

	if (len_squared_v2v2(oldp, newp) < (4.0f * 4.0f))
		return menu->dotowards;

	/* verify that we are moving towards one of the edges of the
	 * menu block, in other words, in the triangle formed by the
	 * initial mouse location and two edge points. */
	ui_block_to_window_rctf(menu->region, block, &rect_px, &block->rect);

	p1[0] = rect_px.xmin - margin;
	p1[1] = rect_px.ymin - margin;

	p2[0] = rect_px.xmax + margin;
	p2[1] = rect_px.ymin - margin;

	p3[0] = rect_px.xmax + margin;
	p3[1] = rect_px.ymax + margin;

	p4[0] = rect_px.xmin - margin;
	p4[1] = rect_px.ymax + margin;

	/* allow for some wiggle room, if the user moves a few pixels away,
	 * don't immediately quit (only for top level menus) */
	if (use_wiggle_room) {
		const float cent[2] = {
		    BLI_rctf_cent_x(&rect_px),
		    BLI_rctf_cent_y(&rect_px)};
		float delta[2];

		sub_v2_v2v2(delta, oldp, cent);
		normalize_v2_length(delta, MENU_TOWARDS_WIGGLE_ROOM);
		add_v2_v2(oldp, delta);
	}

	closer = (isect_point_tri_v2(newp, oldp, p1, p2) ||
	          isect_point_tri_v2(newp, oldp, p2, p3) ||
	          isect_point_tri_v2(newp, oldp, p3, p4) ||
	          isect_point_tri_v2(newp, oldp, p4, p1));

	if (!closer)
		menu->dotowards = false;

	/* 1 second timer */
	if (PIL_check_seconds_timer() - menu->towardstime > BUTTON_MOUSE_TOWARDS_THRESH)
		menu->dotowards = false;

	return menu->dotowards;
}

#ifdef USE_KEYNAV_LIMIT
static void ui_mouse_motion_keynav_init(struct uiKeyNavLock *keynav, const wmEvent *event)
{
	keynav->is_keynav = true;
	copy_v2_v2_int(keynav->event_xy, &event->x);
}
/**
 * Return true if keyinput isn't blocking mouse-motion,
 * or if the mouse-motion is enough to disable keyinput.
 */
static bool ui_mouse_motion_keynav_test(struct uiKeyNavLock *keynav, const wmEvent *event)
{
	if (keynav->is_keynav && (len_manhattan_v2v2_int(keynav->event_xy, &event->x) > BUTTON_KEYNAV_PX_LIMIT)) {
		keynav->is_keynav = false;
	}

	return keynav->is_keynav;
}
#endif  /* USE_KEYNAV_LIMIT */

static char ui_menu_scroll_test(uiBlock *block, int my)
{
	if (block->flag & (UI_BLOCK_CLIPTOP | UI_BLOCK_CLIPBOTTOM)) {
		if (block->flag & UI_BLOCK_CLIPTOP)
			if (my > block->rect.ymax - UI_MENU_SCROLL_MOUSE)
				return 't';
		if (block->flag & UI_BLOCK_CLIPBOTTOM)
			if (my < block->rect.ymin + UI_MENU_SCROLL_MOUSE)
				return 'b';
	}
	return 0;
}

static int ui_menu_scroll(ARegion *ar, uiBlock *block, int my, uiBut *to_bt)
{
	uiBut *bt;
	float dy = 0.0f;

	if (to_bt) {
		/* scroll to activated button */
		if (block->flag & UI_BLOCK_CLIPTOP) {
			if (to_bt->rect.ymax > block->rect.ymax - UI_MENU_SCROLL_ARROW)
				dy = block->rect.ymax - to_bt->rect.ymax - UI_MENU_SCROLL_ARROW;
		}
		if (block->flag & UI_BLOCK_CLIPBOTTOM) {
			if (to_bt->rect.ymin < block->rect.ymin + UI_MENU_SCROLL_ARROW)
				dy = block->rect.ymin - to_bt->rect.ymin + UI_MENU_SCROLL_ARROW;
		}
	}
	else {
		/* scroll when mouse over arrow buttons */
		char test = ui_menu_scroll_test(block, my);

		if (test == 't')
			dy = -UI_UNIT_Y; /* scroll to the top */
		else if (test == 'b')
			dy = UI_UNIT_Y; /* scroll to the bottom */
	}

	if (dy != 0.0f) {
		if (dy < 0.0f) {
			/* stop at top item, extra 0.5 unit Y makes it snap nicer */
			float ymax = -FLT_MAX;

			for (bt = block->buttons.first; bt; bt = bt->next)
				ymax = max_ff(ymax, bt->rect.ymax);

			if (ymax + dy - UI_UNIT_Y * 0.5f < block->rect.ymax - UI_MENU_SCROLL_PAD)
				dy = block->rect.ymax - ymax - UI_MENU_SCROLL_PAD;
		}
		else {
			/* stop at bottom item, extra 0.5 unit Y makes it snap nicer */
			float ymin = FLT_MAX;

			for (bt = block->buttons.first; bt; bt = bt->next)
				ymin = min_ff(ymin, bt->rect.ymin);

			if (ymin + dy + UI_UNIT_Y * 0.5f > block->rect.ymin + UI_MENU_SCROLL_PAD)
				dy = block->rect.ymin - ymin + UI_MENU_SCROLL_PAD;
		}

		/* remember scroll offset for refreshes */
		block->handle->scrolloffset += dy;

		/* apply scroll offset */
		for (bt = block->buttons.first; bt; bt = bt->next) {
			bt->rect.ymin += dy;
			bt->rect.ymax += dy;
		}

		/* set flags again */
		ui_popup_block_scrolltest(block);

		ED_region_tag_redraw(ar);

		return 1;
	}

	return 0;
}

/**
 * Special function to handle nested menus.
 * let the parent menu get the event.
 *
 * This allows a menu to be open,
 * but send key events to the parent if there's no active buttons.
 *
 * Without this keyboard navigation from menu's wont work.
 */
static bool ui_menu_pass_event_to_parent_if_nonactive(
        uiPopupBlockHandle *menu, const uiBut *but,
        const int level, const int retval)
{
	if ((level != 0) && (but == NULL)) {
		menu->menuretval = UI_RETURN_OUT | UI_RETURN_OUT_PARENT;
		(void) retval;  /* so release builds with strict flags are happy as well */
		BLI_assert(retval == WM_UI_HANDLER_CONTINUE);
		return true;
	}
	else {
		return false;
	}
}

static int ui_handle_menu_button(bContext *C, const wmEvent *event, uiPopupBlockHandle *menu)
{
	ARegion *ar = menu->region;
	uiBut *but = ui_but_find_active_in_region(ar);
	int retval;

	if (but) {
		/* Its possible there is an active menu item NOT under the mouse,
		 * in this case ignore mouse clicks outside the button (but Enter etc is accepted) */
		if (event->val == KM_RELEASE) {
			/* pass, needed so we can exit active menu-items when click-dragging out of them */
		}
		else if (!ui_block_is_menu(but->block) || ui_block_is_pie_menu(but->block)) {
			/* pass, skip for dialogs */
		}
		else if (!ui_region_contains_point_px(but->active->region, event->x, event->y)) {
			/* pass, needed to click-exit outside of non-flaoting menus */
		}
		else if ((!ELEM(event->type, MOUSEMOVE, WHEELUPMOUSE, WHEELDOWNMOUSE, MOUSEPAN)) && ISMOUSE(event->type)) {
			if (!ui_but_contains_point_px(but->active->region, but, event->x, event->y)) {
				but = NULL;
			}
		}
	}

	if (but) {
		ScrArea *ctx_area = CTX_wm_area(C);
		ARegion *ctx_region = CTX_wm_region(C);

		if (menu->ctx_area) CTX_wm_area_set(C, menu->ctx_area);
		if (menu->ctx_region) CTX_wm_region_set(C, menu->ctx_region);

		retval = ui_handle_button_event(C, event, but);

		if (menu->ctx_area) CTX_wm_area_set(C, ctx_area);
		if (menu->ctx_region) CTX_wm_region_set(C, ctx_region);
	}
	else {
		retval = ui_handle_button_over(C, event, ar);
	}

	return retval;
}

float ui_block_calc_pie_segment(uiBlock *block, const float event_xy[2])
{
	float seg1[2];
	float seg2[2];
	float len;

	if (block->pie_data.flags & UI_PIE_INITIAL_DIRECTION) {
		copy_v2_v2(seg1, block->pie_data.pie_center_init);
	}
	else {
		copy_v2_v2(seg1, block->pie_data.pie_center_spawned);
	}

	sub_v2_v2v2(seg2, event_xy, seg1);

	len = normalize_v2_v2(block->pie_data.pie_dir, seg2);

	if (len < U.pie_menu_threshold * U.dpi_fac)
		block->pie_data.flags |= UI_PIE_INVALID_DIR;
	else
		block->pie_data.flags &= ~UI_PIE_INVALID_DIR;

	return len;
}

static int ui_handle_menu_event(
        bContext *C, const wmEvent *event, uiPopupBlockHandle *menu,
        int level, const bool is_parent_inside, const bool is_parent_menu, const bool is_floating)
{
	ARegion *ar;
	uiBlock *block;
	uiBut *but;
	int mx, my, retval;
	bool inside;
	bool inside_title;  /* check for title dragging */

	ar = menu->region;
	block = ar->uiblocks.first;

	retval = WM_UI_HANDLER_CONTINUE;

	mx = event->x;
	my = event->y;
	ui_window_to_block(ar, block, &mx, &my);

	/* check if mouse is inside block */
	inside = BLI_rctf_isect_pt(&block->rect, mx, my);
	inside_title = inside && ((my + (UI_UNIT_Y * 1.5f)) > block->rect.ymax);

	/* if there's an active modal button, don't check events or outside, except for search menu */
	but = ui_but_find_active_in_region(ar);

#ifdef USE_DRAG_POPUP
	if (menu->is_grab) {
		if (event->type == LEFTMOUSE) {
			menu->is_grab = false;
			retval = WM_UI_HANDLER_BREAK;
		}
		else {
			if (event->type == MOUSEMOVE) {
				int mdiff[2];

				sub_v2_v2v2_int(mdiff, &event->x, menu->grab_xy_prev);
				copy_v2_v2_int(menu->grab_xy_prev, &event->x);

				add_v2_v2v2_int(menu->popup_create_vars.event_xy, menu->popup_create_vars.event_xy, mdiff);

				ui_popup_translate(ar, mdiff);
			}

			return retval;
		}
	}
#endif

	if (but && button_modal_state(but->active->state)) {
		if (block->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER)) {
			/* if a button is activated modal, always reset the start mouse
			 * position of the towards mechanism to avoid losing focus,
			 * and don't handle events */
			ui_mouse_motion_towards_reinit(menu, &event->x);
		}
	}
	else if (event->type == TIMER) {
		if (event->customdata == menu->scrolltimer)
			ui_menu_scroll(ar, block, my, NULL);
	}
	else {
		/* for ui_mouse_motion_towards_block */
		if (event->type == MOUSEMOVE) {
			if (block->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER)) {
				ui_mouse_motion_towards_init(menu, &event->x);
			}

			/* add menu scroll timer, if needed */
			if (ui_menu_scroll_test(block, my))
				if (menu->scrolltimer == NULL)
					menu->scrolltimer =
					    WM_event_add_timer(CTX_wm_manager(C), CTX_wm_window(C), TIMER, MENU_SCROLL_INTERVAL);
		}

		/* first block own event func */
		if (block->block_event_func && block->block_event_func(C, block, event)) {
			/* pass */
		}   /* events not for active search menu button */
		else {
			int act = 0;

			switch (event->type) {

				/* closing sublevels of pulldowns */
				case LEFTARROWKEY:
					if (event->val == KM_PRESS && (block->flag & UI_BLOCK_LOOP))
						if (block->saferct.first)
							menu->menuretval = UI_RETURN_OUT;

					retval = WM_UI_HANDLER_BREAK;
					break;

				/* opening sublevels of pulldowns */
				case RIGHTARROWKEY:
					if (event->val == KM_PRESS && (block->flag & UI_BLOCK_LOOP)) {

						if (ui_menu_pass_event_to_parent_if_nonactive(menu, but, level, retval))
							break;

						but = ui_but_find_active_in_region(ar);

						if (!but) {
							/* no item active, we make first active */
							if (block->direction & UI_DIR_UP) but = ui_but_last(block);
							else but = ui_but_first(block);
						}

						if (but && ELEM(but->type, UI_BTYPE_BLOCK, UI_BTYPE_PULLDOWN))
							ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_OPEN);
					}

					retval = WM_UI_HANDLER_BREAK;
					break;

				case UPARROWKEY:
				case DOWNARROWKEY:
				case WHEELUPMOUSE:
				case WHEELDOWNMOUSE:
				case MOUSEPAN:
					/* arrowkeys: only handle for block_loop blocks */
					if (IS_EVENT_MOD(event, shift, ctrl, alt, oskey)) {
						/* pass */
					}
					else if (inside || (block->flag & UI_BLOCK_LOOP)) {
						int type = event->type;
						int val = event->val;

						/* convert pan to scrollwheel */
						if (type == MOUSEPAN)
							ui_pan_to_scroll(event, &type, &val);

						if (val == KM_PRESS) {
							const bool is_next =
							        (ELEM(type, DOWNARROWKEY, WHEELDOWNMOUSE) ==
							        ((block->flag & UI_BLOCK_IS_FLIP) != 0));

							if (ui_menu_pass_event_to_parent_if_nonactive(menu, but, level, retval))
								break;

#ifdef USE_KEYNAV_LIMIT
							ui_mouse_motion_keynav_init(&menu->keynav_state, event);
#endif

							but = ui_but_find_active_in_region(ar);
							if (but) {
								/* next button */
								but = is_next ? ui_but_next(but) : ui_but_prev(but);
							}

							if (!but) {
								/* wrap button */
								uiBut *but_wrap;
								but_wrap = is_next ? ui_but_first(block) : ui_but_last(block);
								if (but_wrap) {
									but = but_wrap;
								}
							}

							if (but) {
								ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE);
								ui_menu_scroll(ar, block, my, but);
							}
						}

						retval = WM_UI_HANDLER_BREAK;
					}

					break;

				case ONEKEY:    case PAD1:
					act = 1; ATTR_FALLTHROUGH;
				case TWOKEY:    case PAD2:
					if (act == 0) act = 2; ATTR_FALLTHROUGH;
				case THREEKEY:  case PAD3:
					if (act == 0) act = 3; ATTR_FALLTHROUGH;
				case FOURKEY:   case PAD4:
					if (act == 0) act = 4; ATTR_FALLTHROUGH;
				case FIVEKEY:   case PAD5:
					if (act == 0) act = 5; ATTR_FALLTHROUGH;
				case SIXKEY:    case PAD6:
					if (act == 0) act = 6; ATTR_FALLTHROUGH;
				case SEVENKEY:  case PAD7:
					if (act == 0) act = 7; ATTR_FALLTHROUGH;
				case EIGHTKEY:  case PAD8:
					if (act == 0) act = 8; ATTR_FALLTHROUGH;
				case NINEKEY:   case PAD9:
					if (act == 0) act = 9; ATTR_FALLTHROUGH;
				case ZEROKEY:   case PAD0:
					if (act == 0) act = 10;

					if ((block->flag & UI_BLOCK_NUMSELECT) && event->val == KM_PRESS) {
						int count;

						if (ui_menu_pass_event_to_parent_if_nonactive(menu, but, level, retval))
							break;

						if (event->alt) act += 10;

						count = 0;
						for (but = block->buttons.first; but; but = but->next) {
							bool doit = false;

							if (!ELEM(but->type, UI_BTYPE_LABEL, UI_BTYPE_SEPR, UI_BTYPE_SEPR_LINE))
								count++;

							/* exception for rna layer buts */
							if (but->rnapoin.data && but->rnaprop &&
							    ELEM(RNA_property_subtype(but->rnaprop), PROP_LAYER, PROP_LAYER_MEMBER))
							{
								if (but->rnaindex == act - 1) {
									doit = true;
								}
							}
							else if (ELEM(but->type,
							              UI_BTYPE_BUT,
							              UI_BTYPE_BUT_MENU,
							              UI_BTYPE_MENU, UI_BTYPE_BLOCK,
							              UI_BTYPE_PULLDOWN) &&
							         count == act)
							{
								doit = true;
							}

							if (!(but->flag & UI_BUT_DISABLED) && doit) {
								/* activate buttons but open menu's */
								uiButtonActivateType activate;
								if (but->type == UI_BTYPE_PULLDOWN) {
									activate = BUTTON_ACTIVATE_OPEN;
								}
								else {
									activate = BUTTON_ACTIVATE_APPLY;
								}

								ui_handle_button_activate(C, ar, but, activate);
								break;
							}
						}

						retval = WM_UI_HANDLER_BREAK;
					}
					break;

				/* Handle keystrokes on menu items */
				case AKEY:
				case BKEY:
				case CKEY:
				case DKEY:
				case EKEY:
				case FKEY:
				case GKEY:
				case HKEY:
				case IKEY:
				case JKEY:
				case KKEY:
				case LKEY:
				case MKEY:
				case NKEY:
				case OKEY:
				case PKEY:
				case QKEY:
				case RKEY:
				case SKEY:
				case TKEY:
				case UKEY:
				case VKEY:
				case WKEY:
				case XKEY:
				case YKEY:
				case ZKEY:
				{
					if ((event->val  == KM_PRESS || event->val == KM_DBL_CLICK) &&
					    !IS_EVENT_MOD(event, shift, ctrl, oskey))
					{
						if (ui_menu_pass_event_to_parent_if_nonactive(menu, but, level, retval))
							break;

						for (but = block->buttons.first; but; but = but->next) {
							if (!(but->flag & UI_BUT_DISABLED) && but->menu_key == event->type) {
								if (ELEM(but->type, UI_BTYPE_BUT, UI_BTYPE_BUT_MENU)) {
									/* mainly for operator buttons */
									ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_APPLY);
								}
								else if (ELEM(but->type, UI_BTYPE_BLOCK, UI_BTYPE_PULLDOWN)) {
									/* open submenus (like right arrow key) */
									ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE_OPEN);
								}
								else if (but->type == UI_BTYPE_MENU) {
									/* activate menu items */
									ui_handle_button_activate(C, ar, but, BUTTON_ACTIVATE);
								}
								else {
									printf("%s: error, but->menu_key type: %u\n", __func__, but->type);
								}

								break;
							}
						}

						retval = WM_UI_HANDLER_BREAK;
					}
					break;
				}
			}
		}

		/* here we check return conditions for menus */
		if (block->flag & UI_BLOCK_LOOP) {
			/* if we click outside the block, verify if we clicked on the
			 * button that opened us, otherwise we need to close,
			 *
			 * note that there is an exception for root level menus and
			 * popups which you can click again to close.
			 */
			if (inside == 0) {
				uiSafetyRct *saferct = block->saferct.first;

				if (ELEM(event->type, LEFTMOUSE, MIDDLEMOUSE, RIGHTMOUSE)) {
					if (ELEM(event->val, KM_PRESS, KM_DBL_CLICK)) {
						if ((is_parent_menu == false) && (U.uiflag & USER_MENUOPENAUTO) == 0) {
							/* for root menus, allow clicking to close */
							if (block->flag & (UI_BLOCK_OUT_1))
								menu->menuretval = UI_RETURN_OK;
							else
								menu->menuretval = UI_RETURN_OUT;
						}
						else if (saferct && !BLI_rctf_isect_pt(&saferct->parent, event->x, event->y)) {
							if (block->flag & (UI_BLOCK_OUT_1))
								menu->menuretval = UI_RETURN_OK;
							else
								menu->menuretval = UI_RETURN_OUT;
						}
					}
					else if (ELEM(event->val, KM_RELEASE, KM_CLICK)) {
						/* For buttons that use a hold function, exit when mouse-up outside the menu. */
						if (block->flag & UI_BLOCK_POPUP_HOLD) {
							/* Note, we could check the cursor is over the parent button. */
							menu->menuretval = UI_RETURN_CANCEL;
							retval = WM_UI_HANDLER_CONTINUE;
						}
					}
				}
			}

			if (menu->menuretval) {
				/* pass */
			}
#ifdef USE_KEYNAV_LIMIT
			else if ((event->type == MOUSEMOVE) && ui_mouse_motion_keynav_test(&menu->keynav_state, event)) {
				/* don't handle the mousemove if we're using key-navigation */
				retval = WM_UI_HANDLER_BREAK;
			}
#endif
			else if (event->type == ESCKEY && event->val == KM_PRESS) {
				/* esc cancels this and all preceding menus */
				menu->menuretval = UI_RETURN_CANCEL;
			}
			else if (ELEM(event->type, RETKEY, PADENTER) && event->val == KM_PRESS) {
				/* enter will always close this block, we let the event
				 * get handled by the button if it is activated, otherwise we cancel */
				if (!ui_but_find_active_in_region(ar))
					menu->menuretval = UI_RETURN_CANCEL | UI_RETURN_POPUP_OK;
			}
#ifdef USE_DRAG_POPUP
			else if ((event->type == LEFTMOUSE) && (event->val == KM_PRESS) &&
			         (inside && is_floating && inside_title))
			{
				if (!but || !ui_but_contains_point_px(ar, but, event->x, event->y)) {
					if (but) {
						UI_but_tooltip_timer_remove(C, but);
					}

					menu->is_grab = true;
					copy_v2_v2_int(menu->grab_xy_prev, &event->x);
					retval = WM_UI_HANDLER_BREAK;
				}
			}
#endif
			else {

				/* check mouse moving outside of the menu */
				if (inside == 0 && (block->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER))) {
					uiSafetyRct *saferct;

					ui_mouse_motion_towards_check(block, menu, &event->x, is_parent_inside == false);

					/* check for all parent rects, enables arrowkeys to be used */
					for (saferct = block->saferct.first; saferct; saferct = saferct->next) {
						/* for mouse move we only check our own rect, for other
						 * events we check all preceding block rects too to make
						 * arrow keys navigation work */
						if (event->type != MOUSEMOVE || saferct == block->saferct.first) {
							if (BLI_rctf_isect_pt(&saferct->parent, (float)event->x, (float)event->y))
								break;
							if (BLI_rctf_isect_pt(&saferct->safety, (float)event->x, (float)event->y))
								break;
						}
					}

					/* strict check, and include the parent rect */
					if (!menu->dotowards && !saferct) {
						if (block->flag & (UI_BLOCK_OUT_1))
							menu->menuretval = UI_RETURN_OK;
						else
							menu->menuretval = UI_RETURN_OUT;
					}
					else if (menu->dotowards && event->type == MOUSEMOVE)
						retval = WM_UI_HANDLER_BREAK;
				}
			}

			/* end switch */
		}
	}

	/* if we are didn't handle the event yet, lets pass it on to
	 * buttons inside this region. disabled inside check .. not sure
	 * anymore why it was there? but it meant enter didn't work
	 * for example when mouse was not over submenu */
	if ((event->type == TIMER) ||
	    (/*inside &&*/ (!menu->menuretval || (menu->menuretval & UI_RETURN_UPDATE)) && retval == WM_UI_HANDLER_CONTINUE))
	{
		retval = ui_handle_menu_button(C, event, menu);
	}

#ifdef USE_UI_POPOVER_ONCE
	if (block->flag & UI_BLOCK_POPOVER_ONCE) {
		if ((event->type == LEFTMOUSE) && (event->val == KM_RELEASE)) {
			UI_popover_once_clear(menu->popup_create_vars.arg);
			block->flag &= ~UI_BLOCK_POPOVER_ONCE;
		}
	}
#endif

	/* Don't handle double click events, rehandle as regular press/release. */
	if (retval == WM_UI_HANDLER_CONTINUE && event->val == KM_DBL_CLICK) {
		return retval;
	}

	/* if we set a menu return value, ensure we continue passing this on to
	 * lower menus and buttons, so always set continue then, and if we are
	 * inside the region otherwise, ensure we swallow the event */
	if (menu->menuretval)
		return WM_UI_HANDLER_CONTINUE;
	else if (inside)
		return WM_UI_HANDLER_BREAK;
	else
		return retval;
}

static int ui_handle_menu_return_submenu(bContext *C, const wmEvent *event, uiPopupBlockHandle *menu)
{
	ARegion *ar;
	uiBut *but;
	uiBlock *block;
	uiHandleButtonData *data;
	uiPopupBlockHandle *submenu;

	ar = menu->region;
	block = ar->uiblocks.first;

	but = ui_but_find_active_in_region(ar);

	BLI_assert(but);

	data = but->active;
	submenu = data->menu;

	if (submenu->menuretval) {
		bool update;

		/* first decide if we want to close our own menu cascading, if
		 * so pass on the sub menu return value to our own menu handle */
		if ((submenu->menuretval & UI_RETURN_OK) || (submenu->menuretval & UI_RETURN_CANCEL)) {
			if (!(block->flag & UI_BLOCK_KEEP_OPEN)) {
				menu->menuretval = submenu->menuretval;
				menu->butretval = data->retval;
			}
		}

		update = (submenu->menuretval & UI_RETURN_UPDATE) != 0;

		/* now let activated button in this menu exit, which
		 * will actually close the submenu too */
		ui_handle_button_return_submenu(C, event, but);

		if (update)
			submenu->menuretval = 0;
	}

	if (block->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER)) {
		/* for cases where close does not cascade, allow the user to
		 * move the mouse back towards the menu without closing */
		ui_mouse_motion_towards_reinit(menu, &event->x);
	}

	if (menu->menuretval) {
		return WM_UI_HANDLER_CONTINUE;
	}
	else {
		return WM_UI_HANDLER_BREAK;
	}
}

static bool ui_but_pie_menu_supported_apply(uiBut *but)
{
	return (!ELEM(but->type, UI_BTYPE_NUM_SLIDER, UI_BTYPE_NUM));
}

static int ui_but_pie_menu_apply(bContext *C, uiPopupBlockHandle *menu, uiBut *but, bool force_close)
{
	int retval = WM_UI_HANDLER_BREAK;

	if (but && ui_but_pie_menu_supported_apply(but)) {
		if (but->type == UI_BTYPE_MENU) {
			/* forcing the pie menu to close will not handle menus */
			if (!force_close) {
				uiBut *active_but = ui_but_find_active_in_region(menu->region);

				if (active_but) {
					button_activate_exit(C, active_but, active_but->active, false, false);
				}

				button_activate_init(C, menu->region, but, BUTTON_ACTIVATE_OPEN);
				return retval;
			}
			else {
				menu->menuretval = UI_RETURN_CANCEL;
			}
		}
		else {
			ui_apply_but(C, but->block, but, but->active, false);
			button_activate_exit((bContext *)C, but, but->active, false, true);

			menu->menuretval = UI_RETURN_OK;
		}
	}
	else {
		menu->menuretval = UI_RETURN_CANCEL;

		ED_region_tag_redraw(menu->region);
	}

	return retval;
}

static uiBut *ui_block_pie_dir_activate(uiBlock *block, const wmEvent *event, RadialDirection dir)
{
	uiBut *but;

	if ((block->flag & UI_BLOCK_NUMSELECT) && event->val == KM_PRESS) {
		for (but = block->buttons.first; but; but = but->next) {
			if (but->pie_dir == dir && !ELEM(but->type, UI_BTYPE_SEPR, UI_BTYPE_SEPR_LINE)) {
				return but;
			}
		}
	}

	return NULL;
}

static int ui_but_pie_button_activate(bContext *C, uiBut *but, uiPopupBlockHandle *menu)
{
	uiBut *active_but;

	if (but == NULL)
		return WM_UI_HANDLER_BREAK;

	active_but = ui_but_find_active_in_region(menu->region);

	if (active_but)
		button_activate_exit(C, active_but, active_but->active, false, false);

	button_activate_init(C, menu->region, but, BUTTON_ACTIVATE_OVER);
	return ui_but_pie_menu_apply(C, menu, but, false);
}

static int ui_pie_handler(bContext *C, const wmEvent *event, uiPopupBlockHandle *menu)
{
	ARegion *ar;
	uiBlock *block;
	uiBut *but;
	float event_xy[2];
	double duration;
	bool is_click_style;
	float dist;

	/* we block all events, this is modal interaction, except for drop events which is described below */
	int retval = WM_UI_HANDLER_BREAK;

	if (event->type == EVT_DROP) {
		/* may want to leave this here for later if we support pie ovens */

		retval = WM_UI_HANDLER_CONTINUE;
	}

	ar = menu->region;
	block = ar->uiblocks.first;

	is_click_style = (block->pie_data.flags & UI_PIE_CLICK_STYLE);

	/* if there's an active modal button, don't check events or outside, except for search menu */
	but = ui_but_find_active_in_region(ar);

	if (menu->scrolltimer == NULL) {
		menu->scrolltimer =
		    WM_event_add_timer(CTX_wm_manager(C), CTX_wm_window(C), TIMER, PIE_MENU_INTERVAL);
		menu->scrolltimer->duration = 0.0;
	}

	duration = menu->scrolltimer->duration;

	event_xy[0] = event->x;
	event_xy[1] = event->y;

	ui_window_to_block_fl(ar, block, &event_xy[0], &event_xy[1]);

	dist = ui_block_calc_pie_segment(block, event_xy);

	if (but && button_modal_state(but->active->state)) {
		retval = ui_handle_menu_button(C, event, menu);
	}
	else {
		if (event->type == TIMER) {
			if (event->customdata == menu->scrolltimer) {
				/* deactivate initial direction after a while */
				if (duration > 0.01 * U.pie_initial_timeout) {
					block->pie_data.flags &= ~UI_PIE_INITIAL_DIRECTION;
				}

				/* handle animation */
				if (!(block->pie_data.flags & UI_PIE_ANIMATION_FINISHED)) {
					double final_time = 0.01 * U.pie_animation_timeout;
					float fac = duration / final_time;
					float pie_radius = U.pie_menu_radius * UI_DPI_FAC;

					if (fac > 1.0f) {
						fac = 1.0f;
						block->pie_data.flags |= UI_PIE_ANIMATION_FINISHED;
					}

					for (but = block->buttons.first; but; but = but->next) {
						if (but->pie_dir != UI_RADIAL_NONE) {
							float vec[2];
							float center[2];

							ui_but_pie_dir(but->pie_dir, vec);

							center[0] = (vec[0] > 0.01f) ? 0.5f : ((vec[0] < -0.01f) ? -0.5f : 0.0f);
							center[1] = (vec[1] > 0.99f) ? 0.5f : ((vec[1] < -0.99f) ? -0.5f : 0.0f);

							center[0] *= BLI_rctf_size_x(&but->rect);
							center[1] *= BLI_rctf_size_y(&but->rect);

							mul_v2_fl(vec, pie_radius);
							add_v2_v2(vec, center);
							mul_v2_fl(vec, fac);
							add_v2_v2(vec, block->pie_data.pie_center_spawned);

							BLI_rctf_recenter(&but->rect, vec[0], vec[1]);
						}
					}
					block->pie_data.alphafac = fac;

					ED_region_tag_redraw(ar);
				}
			}

			/* check pie velociy here if gesture has ended */
			if (block->pie_data.flags & UI_PIE_GESTURE_END_WAIT) {
				float len_sq = 10;

				/* use a time threshold to ensure we leave time to the mouse to move */
				if (duration - block->pie_data.duration_gesture > 0.02) {
					len_sq = len_squared_v2v2(event_xy, block->pie_data.last_pos);
					copy_v2_v2(block->pie_data.last_pos, event_xy);
					block->pie_data.duration_gesture = duration;
				}

				if (len_sq < 1.0f) {
					but = ui_but_find_active_in_region(menu->region);

					if (but) {
						return ui_but_pie_menu_apply(C, menu, but, true);
					}
				}
			}
		}

		if (event->type == block->pie_data.event && !is_click_style) {
			if (event->val != KM_RELEASE) {
				ui_handle_menu_button(C, event, menu);

				if (len_squared_v2v2(event_xy, block->pie_data.pie_center_init) > PIE_CLICK_THRESHOLD_SQ) {
					block->pie_data.flags |= UI_PIE_DRAG_STYLE;
				}
				/* why redraw here? It's simple, we are getting many double click events here.
				 * Those operate like mouse move events almost */
				ED_region_tag_redraw(ar);
			}
			else {
				/* distance from initial point */
				if (!(block->pie_data.flags & UI_PIE_DRAG_STYLE)) {
					block->pie_data.flags |= UI_PIE_CLICK_STYLE;
				}
				else {
					but = ui_but_find_active_in_region(menu->region);

					if (but && (U.pie_menu_confirm > 0) &&
					    (dist >= U.dpi_fac * (U.pie_menu_threshold + U.pie_menu_confirm)))
					{
						if (but)
							return ui_but_pie_menu_apply(C, menu, but, true);
					}

					retval = ui_but_pie_menu_apply(C, menu, but, true);

				}
			}
		}
		else {
			/* direction from numpad */
			RadialDirection num_dir = UI_RADIAL_NONE;

			switch (event->type) {
				case MOUSEMOVE:
					if (!is_click_style) {
						float len_sq = len_squared_v2v2(event_xy, block->pie_data.pie_center_init);

						/* here we use the initial position explicitly */
						if (len_sq > PIE_CLICK_THRESHOLD_SQ) {
							block->pie_data.flags |= UI_PIE_DRAG_STYLE;
						}

						/* here instead, we use the offset location to account for the initial direction timeout */
						if ((U.pie_menu_confirm > 0) &&
						    (dist >= U.dpi_fac * (U.pie_menu_threshold + U.pie_menu_confirm)))
						{
							block->pie_data.flags |= UI_PIE_GESTURE_END_WAIT;
							copy_v2_v2(block->pie_data.last_pos, event_xy);
							block->pie_data.duration_gesture = duration;
						}
					}

					ui_handle_menu_button(C, event, menu);

					/* mouse move should always refresh the area for pie menus */
					ED_region_tag_redraw(ar);
					break;

				case LEFTMOUSE:
					if (is_click_style) {
						if (block->pie_data.flags & UI_PIE_INVALID_DIR) {
							menu->menuretval = UI_RETURN_CANCEL;
						}
						else {
							retval = ui_handle_menu_button(C, event, menu);
						}
					}
					break;

				case ESCKEY:
				case RIGHTMOUSE:
					menu->menuretval = UI_RETURN_CANCEL;
					break;

				case AKEY:
				case BKEY:
				case CKEY:
				case DKEY:
				case EKEY:
				case FKEY:
				case GKEY:
				case HKEY:
				case IKEY:
				case JKEY:
				case KKEY:
				case LKEY:
				case MKEY:
				case NKEY:
				case OKEY:
				case PKEY:
				case QKEY:
				case RKEY:
				case SKEY:
				case TKEY:
				case UKEY:
				case VKEY:
				case WKEY:
				case XKEY:
				case YKEY:
				case ZKEY:
				{
					if ((event->val  == KM_PRESS || event->val == KM_DBL_CLICK) &&
					    !IS_EVENT_MOD(event, shift, ctrl, oskey))
					{
						for (but = block->buttons.first; but; but = but->next) {
							if (but->menu_key == event->type) {
								ui_but_pie_button_activate(C, but, menu);
							}
						}
					}
					break;
				}

#define CASE_NUM_TO_DIR(n, d) \
			case (ZEROKEY + n): case (PAD0 + n): \
				{ if (num_dir == UI_RADIAL_NONE) num_dir = d; } (void)0

				CASE_NUM_TO_DIR(1, UI_RADIAL_SW); ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(2, UI_RADIAL_S);  ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(3, UI_RADIAL_SE); ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(4, UI_RADIAL_W);  ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(6, UI_RADIAL_E);  ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(7, UI_RADIAL_NW); ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(8, UI_RADIAL_N);  ATTR_FALLTHROUGH;
				CASE_NUM_TO_DIR(9, UI_RADIAL_NE);
				{
					but = ui_block_pie_dir_activate(block, event, num_dir);
					retval = ui_but_pie_button_activate(C, but, menu);
					break;
				}
#undef CASE_NUM_TO_DIR
				default:
					retval = ui_handle_menu_button(C, event, menu);
					break;
			}
		}
	}

	return retval;
}

static int ui_handle_menus_recursive(
        bContext *C, const wmEvent *event, uiPopupBlockHandle *menu,
        int level, const bool is_parent_inside, const bool is_parent_menu, const bool is_floating)
{
	uiBut *but;
	uiHandleButtonData *data;
	uiPopupBlockHandle *submenu;
	int retval = WM_UI_HANDLER_CONTINUE;
	bool do_towards_reinit = false;

	/* check if we have a submenu, and handle events for it first */
	but = ui_but_find_active_in_region(menu->region);
	data = (but) ? but->active : NULL;
	submenu = (data) ? data->menu : NULL;

	if (submenu) {
		uiBlock *block = menu->region->uiblocks.first;
		const bool is_menu = ui_block_is_menu(block);
		bool inside = false;
		/* root pie menus accept the key that spawned them as double click to improve responsiveness */
		bool do_recursion = (!(block->flag & UI_BLOCK_RADIAL) || event->type != block->pie_data.event);

		if (do_recursion) {
			if (is_parent_inside == false) {
				int mx, my;

				mx = event->x;
				my = event->y;
				ui_window_to_block(menu->region, block, &mx, &my);
				inside = BLI_rctf_isect_pt(&block->rect, mx, my);
			}

			retval = ui_handle_menus_recursive(C, event, submenu, level + 1, is_parent_inside || inside, is_menu, false);
		}
	}

	/* now handle events for our own menu */
	if (retval == WM_UI_HANDLER_CONTINUE || event->type == TIMER) {
		const bool do_but_search = (but && (but->type == UI_BTYPE_SEARCH_MENU));
		if (submenu && submenu->menuretval) {
			const bool do_ret_out_parent = (submenu->menuretval & UI_RETURN_OUT_PARENT) != 0;
			retval = ui_handle_menu_return_submenu(C, event, menu);
			submenu = NULL;  /* hint not to use this, it may be freed by call above */
			(void)submenu;
			/* we may want to quit the submenu and handle the even in this menu,
			 * if its important to use it, check 'data->menu' first */
			if (((retval == WM_UI_HANDLER_BREAK) && do_ret_out_parent) == 0) {
				/* skip applying the event */
				return retval;
			}
		}

		if (do_but_search) {
			uiBlock *block = menu->region->uiblocks.first;

			retval = ui_handle_menu_button(C, event, menu);

			if (block->flag & (UI_BLOCK_MOVEMOUSE_QUIT | UI_BLOCK_POPOVER)) {
				/* when there is a active search button and we close it,
				 * we need to reinit the mouse coords [#35346] */
				if (ui_but_find_active_in_region(menu->region) != but) {
					do_towards_reinit = true;
				}
			}
		}
		else {
			uiBlock *block = menu->region->uiblocks.first;
			uiBut *listbox = ui_list_find_mouse_over(menu->region, event);

			if (block->flag & UI_BLOCK_RADIAL) {
				retval = ui_pie_handler(C, event, menu);
			}
			else if (event->type == LEFTMOUSE || event->val != KM_DBL_CLICK) {
				bool handled = false;

				if (listbox) {
					int retval_test = ui_handle_list_event(C, event, menu->region, listbox);
					if (retval_test != WM_UI_HANDLER_CONTINUE) {
						retval = retval_test;
						handled = true;
					}
				}

				if (handled == false) {
					retval = ui_handle_menu_event(
					        C, event, menu, level,
					        is_parent_inside, is_parent_menu, is_floating);
				}
			}
		}
	}

	if (do_towards_reinit) {
		ui_mouse_motion_towards_reinit(menu, &event->x);
	}

	return retval;
}

/**
 * Allow setting menu return value from externals. E.g. WM might need to do this for exiting files correctly.
 */
void UI_popup_menu_retval_set(const uiBlock *block, const int retval, const bool enable)
{
	uiPopupBlockHandle *menu = block->handle;
	if (menu) {
		menu->menuretval = enable ? (menu->menuretval | retval) : (menu->menuretval & retval);
	}
}

/* *************** UI event handlers **************** */

static int ui_region_handler(bContext *C, const wmEvent *event, void *UNUSED(userdata))
{
	ARegion *ar;
	uiBut *but, *listbox;
	int retval;

	/* here we handle buttons at the region level, non-modal */
	ar = CTX_wm_region(C);
	retval = WM_UI_HANDLER_CONTINUE;

	if (ar == NULL || BLI_listbase_is_empty(&ar->uiblocks)) {
		return retval;
	}

	/* either handle events for already activated button or try to activate */
	but = ui_but_find_active_in_region(ar);
	listbox = ui_list_find_mouse_over(ar, event);

	retval = ui_handler_panel_region(C, event, ar, listbox ? listbox : but);

	if (retval == WM_UI_HANDLER_CONTINUE && listbox) {
		retval = ui_handle_list_event(C, event, ar, listbox);

		/* interactions with the listbox should disable tips */
		if (retval == WM_UI_HANDLER_BREAK) {
			if (but) {
				UI_but_tooltip_timer_remove(C, but);
			}
		}
	}

	if (retval == WM_UI_HANDLER_CONTINUE) {
		if (but)
			retval = ui_handle_button_event(C, event, but);
		else
			retval = ui_handle_button_over(C, event, ar);
	}

	/* re-enable tooltips */
	if (event->type == MOUSEMOVE && (event->x != event->prevx || event->y != event->prevy))
		ui_blocks_set_tooltips(ar, true);

	/* delayed apply callbacks */
	ui_apply_but_funcs_after(C);

	return retval;
}

static void ui_region_handler_remove(bContext *C, void *UNUSED(userdata))
{
	bScreen *sc;
	ARegion *ar;

	ar = CTX_wm_region(C);
	if (ar == NULL) return;

	UI_blocklist_free(C, &ar->uiblocks);

	sc = CTX_wm_screen(C);
	if (sc == NULL) return;

	/* delayed apply callbacks, but not for screen level regions, those
	 * we rather do at the very end after closing them all, which will
	 * be done in ui_region_handler/window */
	if (BLI_findindex(&sc->regionbase, ar) == -1)
		ui_apply_but_funcs_after(C);
}

/* handle buttons at the window level, modal, for example while
 * number sliding, text editing, or when a menu block is open */
static int ui_handler_region_menu(bContext *C, const wmEvent *event, void *UNUSED(userdata))
{
	ARegion *ar;
	uiBut *but;
	int retval = WM_UI_HANDLER_CONTINUE;

	ar = CTX_wm_menu(C);
	if (!ar)
		ar = CTX_wm_region(C);

	but = ui_but_find_active_in_region(ar);

	if (but) {
		bScreen *screen = CTX_wm_screen(C);
		ARegion *ar_temp;
		uiBut *but_other;
		uiHandleButtonData *data;
		bool is_inside_menu = false;

		/* look for a popup menu containing the mouse */
		for (ar_temp = screen->regionbase.first; ar_temp; ar_temp = ar_temp->next) {
			rcti winrct;

			ui_region_winrct_get_no_margin(ar_temp, &winrct);

			if (BLI_rcti_isect_pt_v(&winrct, &event->x)) {
				BLI_assert(ar_temp->type->regionid == RGN_TYPE_TEMPORARY);

				is_inside_menu = true;
				break;
			}
		}

		/* handle activated button events */
		data = but->active;

		if ((data->state == BUTTON_STATE_MENU_OPEN) &&
		    (is_inside_menu == false) && /* make sure mouse isn't inside another menu (see T43247) */
		    (ELEM(but->type, UI_BTYPE_PULLDOWN, UI_BTYPE_POPOVER)) &&
		    (but_other = ui_but_find_mouse_over(ar, event)) &&
		    (but != but_other) &&
		    (ELEM(but_other->type, UI_BTYPE_PULLDOWN, UI_BTYPE_POPOVER)))
		{
			/* if mouse moves to a different root-level menu button,
			 * open it to replace the current menu */
			if ((but_other->flag & UI_BUT_DISABLED) == 0) {
				ui_handle_button_activate(C, ar, but_other, BUTTON_ACTIVATE_OVER);
				button_activate_state(C, but_other, BUTTON_STATE_MENU_OPEN);
				retval = WM_UI_HANDLER_BREAK;
			}
		}
		else if (data->state == BUTTON_STATE_MENU_OPEN) {
			/* handle events for menus and their buttons recursively,
			 * this will handle events from the top to the bottom menu */
			if (data->menu) {
				retval = ui_handle_menus_recursive(C, event, data->menu, 0, false, false, false);
			}

			/* handle events for the activated button */
			if ((data->menu && (retval == WM_UI_HANDLER_CONTINUE)) ||
			    (event->type == TIMER))
			{
				if (data->menu && data->menu->menuretval) {
					ui_handle_button_return_submenu(C, event, but);
					retval = WM_UI_HANDLER_BREAK;
				}
				else {
					retval = ui_handle_button_event(C, event, but);
				}
			}
		}
		else {
			/* handle events for the activated button */
			retval = ui_handle_button_event(C, event, but);
		}
	}

	/* re-enable tooltips */
	if (event->type == MOUSEMOVE && (event->x != event->prevx || event->y != event->prevy))
		ui_blocks_set_tooltips(ar, true);

	/* delayed apply callbacks */
	ui_apply_but_funcs_after(C);

	/* Don't handle double-click events,
	 * these will be converted into regular clicks which we handle. */
	if (retval == WM_UI_HANDLER_CONTINUE) {
		if (event->val == KM_DBL_CLICK) {
			return WM_UI_HANDLER_CONTINUE;
		}
	}

	/* we block all events, this is modal interaction */
	return WM_UI_HANDLER_BREAK;
}

/* two types of popups, one with operator + enum, other with regular callbacks */
static int ui_popup_handler(bContext *C, const wmEvent *event, void *userdata)
{
	uiPopupBlockHandle *menu = userdata;
	struct ARegion *menu_region;
	/* we block all events, this is modal interaction, except for drop events which is described below */
	int retval = WM_UI_HANDLER_BREAK;
	bool reset_pie = false;

	menu_region = CTX_wm_menu(C);
	CTX_wm_menu_set(C, menu->region);

	if (event->type == EVT_DROP || event->val == KM_DBL_CLICK) {
		/* EVT_DROP:
		 *   If we're handling drop event we'll want it to be handled by popup callee as well,
		 *   so it'll be possible to perform such operations as opening .blend files by dropping
		 *   them into blender, even if there's opened popup like splash screen (sergey).
		 * KM_DBL_CLICK:
		 *   Continue in case of double click so wm_handlers_do calls handler again with KM_PRESS
		 *   event. This is needed to ensure correct button handling for fast clicking (T47532).
		 */

		retval = WM_UI_HANDLER_CONTINUE;
	}

	ui_handle_menus_recursive(C, event, menu, 0, false, false, true);

	/* free if done, does not free handle itself */
	if (menu->menuretval) {
		wmWindow *win = CTX_wm_window(C);
		/* copy values, we have to free first (closes region) */
		uiPopupBlockHandle temp = *menu;
		uiBlock *block = menu->region->uiblocks.first;

		/* set last pie event to allow chained pie spawning */
		if (block->flag & UI_BLOCK_RADIAL) {
			win->last_pie_event = block->pie_data.event;
			reset_pie = true;
		}

		ui_popup_block_free(C, menu);
		UI_popup_handlers_remove(&win->modalhandlers, menu);
		CTX_wm_menu_set(C, NULL);

#ifdef USE_DRAG_TOGGLE
		{
			WM_event_free_ui_handler_all(
			        C, &win->modalhandlers,
			        ui_handler_region_drag_toggle, ui_handler_region_drag_toggle_remove);
		}
#endif

		if ((temp.menuretval & UI_RETURN_OK) || (temp.menuretval & UI_RETURN_POPUP_OK)) {
			if (temp.popup_func)
				temp.popup_func(C, temp.popup_arg, temp.retvalue);
			if (temp.optype)
				WM_operator_name_call_ptr(C, temp.optype, temp.opcontext, NULL);
		}
		else if (temp.cancel_func)
			temp.cancel_func(C, temp.popup_arg);

		WM_event_add_mousemove(C);
	}
	else {
		/* re-enable tooltips */
		if (event->type == MOUSEMOVE && (event->x != event->prevx || event->y != event->prevy))
			ui_blocks_set_tooltips(menu->region, true);
	}

	/* delayed apply callbacks */
	ui_apply_but_funcs_after(C);

	if (reset_pie) {
		/* reaqcuire window in case pie invalidates it somehow */
		wmWindow *win = CTX_wm_window(C);

		if (win)
			win->last_pie_event = EVENT_NONE;
	}

	CTX_wm_region_set(C, menu_region);

	return retval;
}

static void ui_popup_handler_remove(bContext *C, void *userdata)
{
	uiPopupBlockHandle *menu = userdata;

	/* More correct would be to expect UI_RETURN_CANCEL here, but not wanting to
	 * cancel when removing handlers because of file exit is a rare exception.
	 * So instead of setting cancel flag for all menus before removing handlers,
	 * just explicitly flag menu with UI_RETURN_OK to avoid cancelling it. */
	if ((menu->menuretval & UI_RETURN_OK) == 0 && menu->cancel_func) {
		menu->cancel_func(C, menu->popup_arg);
	}

	/* free menu block if window is closed for some reason */
	ui_popup_block_free(C, menu);

	/* delayed apply callbacks */
	ui_apply_but_funcs_after(C);
}

void UI_region_handlers_add(ListBase *handlers)
{
	WM_event_remove_ui_handler(handlers, ui_region_handler, ui_region_handler_remove, NULL, false);
	WM_event_add_ui_handler(NULL, handlers, ui_region_handler, ui_region_handler_remove, NULL, 0);
}

void UI_popup_handlers_add(bContext *C, ListBase *handlers, uiPopupBlockHandle *popup, const char flag)
{
	WM_event_add_ui_handler(C, handlers, ui_popup_handler, ui_popup_handler_remove, popup, flag);
}

void UI_popup_handlers_remove(ListBase *handlers, uiPopupBlockHandle *popup)
{
	wmEventHandler *handler;

	for (handler = handlers->first; handler; handler = handler->next) {
		if (handler->ui_handle == ui_popup_handler &&
		    handler->ui_remove == ui_popup_handler_remove &&
		    handler->ui_userdata == popup)
		{
			/* tag refresh parent popup */
			if (handler->next &&
			    handler->next->ui_handle == ui_popup_handler &&
			    handler->next->ui_remove == ui_popup_handler_remove)
			{
				uiPopupBlockHandle *parent_popup = handler->next->ui_userdata;
				ED_region_tag_refresh_ui(parent_popup->region);
			}
			break;
		}
	}

	WM_event_remove_ui_handler(handlers, ui_popup_handler, ui_popup_handler_remove, popup, false);
}

void UI_popup_handlers_remove_all(bContext *C, ListBase *handlers)
{
	WM_event_free_ui_handler_all(C, handlers, ui_popup_handler, ui_popup_handler_remove);
}

bool UI_textbutton_activate_rna(
        const bContext *C, ARegion *ar,
        const void *rna_poin_data, const char *rna_prop_id)
{
	uiBlock *block;
	uiBut *but = NULL;

	for (block = ar->uiblocks.first; block; block = block->next) {
		for (but = block->buttons.first; but; but = but->next) {
			if (but->type == UI_BTYPE_TEXT) {
				if (but->rnaprop && but->rnapoin.data == rna_poin_data) {
					if (STREQ(RNA_property_identifier(but->rnaprop), rna_prop_id)) {
						break;
					}
				}
			}
		}
		if (but)
			break;
	}

	if (but) {
		UI_but_active_only(C, ar, block, but);
		return true;
	}
	else {
		return false;
	}
}

bool UI_textbutton_activate_but(const bContext *C, uiBut *actbut)
{
	ARegion *ar = CTX_wm_region(C);
	uiBlock *block;
	uiBut *but = NULL;

	for (block = ar->uiblocks.first; block; block = block->next) {
		for (but = block->buttons.first; but; but = but->next)
			if (but == actbut && but->type == UI_BTYPE_TEXT)
				break;

		if (but)
			break;
	}

	if (but) {
		UI_but_active_only(C, ar, block, but);
		return true;
	}
	else {
		return false;
	}
}


void ui_but_clipboard_free(void)
{
	curvemapping_free_data(&but_copypaste_curve);
}