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blender-archive/source/blender/windowmanager/WM_api.h
Ton Roosendaal ed92105857 2.5 
Modal keymaps.

I've tried to make it as simple as possible, yet still using sufficient facilities to enable self-documenting UIs, saving/reading in files, and proper Python support.

The simplicity is: the 'modal keymap' just checks an event, uses event matching similarly to other keymap matching, and if there's a match it changes the event type, and sets the event value to what the modal keymap has defined. The event values are being defined using EnumPropertyItem structs, so the UI will be able to show all options in self-documenting way.
This system also allows to still handle hardcoded own events.

Tech doc:

1) define keymap
- Create map with unique name, WM_modalkeymap_add()
- Give map property definitions (EnumPropertyItem *)
  This only for UI, so user can get information on available options

2) items
- WM_modalkeymap_add_item(): give it an enum value for events

3) activate
- In keymap definition code, assign the modal keymap to operatortype
  WM_modalkeymap_assign()

4) event manager
- The event handler will check for modal keymap, if so:
  - If the modal map has a match:
    - Sets event->type to EVT_MODAL_MAP
    - Sets event->val to the enum value

5) modal handler
- If event type is EVT_MODAL_MAP:
  - Check event->val, handle it
- Other events can just be handled still

Two examples added in the code:

editors/transform/transform.c: transform_modal_keymap()
editors/screen/screen_ops.c: keymap_modal_set()

Also: to support 'key release' the define KM_RELEASE now is officially
used in event manager, this is not '0', so don't check key events with
the old convention if(event->val) but use if(event->val==KM_PRESS)
2009-07-21 11:03:07 +00:00

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/**
* $Id:
*
* ***** 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* The Original Code is Copyright (C) 2007 Blender Foundation.
* All rights reserved.
*
*
* Contributor(s): Blender Foundation
*
* ***** END GPL LICENSE BLOCK *****
*/
#ifndef WM_API_H
#define WM_API_H
/* dna-savable wmStructs here */
#include "DNA_windowmanager_types.h"
struct bContext;
struct IDProperty;
struct wmEvent;
struct wmEventHandler;
struct wmGesture;
struct wmJob;
struct wmNotifier;
struct rcti;
struct PointerRNA;
struct EnumPropertyItem;
typedef struct wmJob wmJob;
/* general API */
void WM_setprefsize (int stax, int stay, int sizx, int sizy);
void WM_init (struct bContext *C);
void WM_exit (struct bContext *C);
void WM_main (struct bContext *C);
struct wmWindow *WM_window_open (struct bContext *C, struct rcti *rect);
/* files */
int WM_read_homefile (struct bContext *C, struct wmOperator *op);
int WM_write_homefile (struct bContext *C, struct wmOperator *op);
void WM_read_file (struct bContext *C, char *name, struct ReportList *reports);
void WM_write_file (struct bContext *C, char *target, struct ReportList *reports);
void WM_read_autosavefile(struct bContext *C);
void WM_write_autosave (struct bContext *C);
/* mouse cursors */
void WM_cursor_set (struct wmWindow *win, int curs);
void WM_cursor_modal (struct wmWindow *win, int curs);
void WM_cursor_restore (struct wmWindow *win);
void WM_cursor_wait (int val);
void WM_cursor_grab (struct wmWindow *win, int val);
void WM_timecursor (struct wmWindow *win, int nr);
void *WM_paint_cursor_activate(struct wmWindowManager *wm, int (*poll)(struct bContext *C), void (*draw)(struct bContext *C, int, int, void *customdata), void *customdata);
void WM_paint_cursor_end(struct wmWindowManager *wm, void *handle);
/* keymap */
void WM_keymap_init (struct bContext *C);
wmKeymapItem *WM_keymap_verify_item(ListBase *lb, char *idname, short type,
short val, int modifier, short keymodifier);
wmKeymapItem *WM_keymap_add_item(ListBase *lb, char *idname, short type,
short val, int modifier, short keymodifier);
void WM_keymap_tweak (ListBase *lb, short type, short val, int modifier, short keymodifier);
ListBase *WM_keymap_listbase (struct wmWindowManager *wm, const char *nameid,
short spaceid, short regionid);
wmKeyMap *WM_modalkeymap_add(struct wmWindowManager *wm, const char *nameid, struct EnumPropertyItem *items);
wmKeyMap *WM_modalkeymap_get(struct wmWindowManager *wm, const char *nameid);
void WM_modalkeymap_add_item(wmKeyMap *km, short type, short val, int modifier, short keymodifier, short value);
void WM_modalkeymap_assign(wmKeyMap *km, const char *opname);
const char *WM_key_event_string(short type);
char *WM_key_event_operator_string(const struct bContext *C, const char *opname, int opcontext, struct IDProperty *properties, char *str, int len);
/* handlers */
struct wmEventHandler *WM_event_add_keymap_handler(ListBase *handlers, ListBase *keymap);
/* boundbox, optional subwindow boundbox for offset */
struct wmEventHandler *WM_event_add_keymap_handler_bb(ListBase *handlers, ListBase *keymap, rcti *bb, rcti *swinbb);
/* priority not implemented, it adds in begin */
struct wmEventHandler *WM_event_add_keymap_handler_priority(ListBase *handlers, ListBase *keymap, int priority);
void WM_event_remove_keymap_handler(ListBase *handlers, ListBase *keymap);
struct wmEventHandler *WM_event_add_ui_handler(const struct bContext *C, ListBase *handlers,
int (*func)(struct bContext *C, struct wmEvent *event, void *userdata),
void (*remove)(struct bContext *C, void *userdata), void *userdata);
void WM_event_remove_ui_handler(ListBase *handlers,
int (*func)(struct bContext *C, struct wmEvent *event, void *userdata),
void (*remove)(struct bContext *C, void *userdata), void *userdata);
struct wmEventHandler *WM_event_add_modal_handler(struct bContext *C, ListBase *handlers, struct wmOperator *op);
void WM_event_remove_handlers(struct bContext *C, ListBase *handlers);
void WM_event_add_mousemove(struct bContext *C);
int WM_modal_tweak_exit(struct wmEvent *evt, int tweak_event);
void WM_event_add_notifier(const struct bContext *C, unsigned int type, void *data);
void wm_event_add (struct wmWindow *win, struct wmEvent *event_to_add); /* XXX only for warning */
/* at maximum, every timestep seconds it triggers event_type events */
struct wmTimer *WM_event_add_window_timer(struct wmWindow *win, int event_type, double timestep);
void WM_event_remove_window_timer(struct wmWindow *win, struct wmTimer *timer);
void WM_event_window_timer_sleep(struct wmWindow *win, struct wmTimer *timer, int dosleep);
/* operator api, default callbacks */
/* invoke callback, uses enum property named "type" */
int WM_menu_invoke (struct bContext *C, struct wmOperator *op, struct wmEvent *event);
/* invoke callback, confirm menu + exec */
int WM_operator_confirm (struct bContext *C, struct wmOperator *op, struct wmEvent *event);
/* invoke callback, file selector "filename" unset + exec */
int WM_operator_filesel (struct bContext *C, struct wmOperator *op, struct wmEvent *event);
/* poll callback, context checks */
int WM_operator_winactive (struct bContext *C);
/* invoke callback, exec + redo popup */
int WM_operator_props_popup (struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_operator_redo_popup (struct bContext *C, struct wmOperator *op);
/* operator api */
void WM_operator_free (struct wmOperator *op);
void WM_operator_stack_clear(struct bContext *C);
wmOperatorType *WM_operatortype_find(const char *idnamem, int quiet);
wmOperatorType *WM_operatortype_exists(const char *idname);
wmOperatorType *WM_operatortype_first(void);
void WM_operatortype_append (void (*opfunc)(wmOperatorType*));
void WM_operatortype_append_ptr (void (*opfunc)(wmOperatorType*, void *), void *userdata);
int WM_operatortype_remove(const char *idname);
int WM_operator_call (struct bContext *C, struct wmOperator *op);
int WM_operator_repeat (struct bContext *C, struct wmOperator *op);
int WM_operator_name_call (struct bContext *C, const char *opstring, int context, struct PointerRNA *properties);
int WM_operator_call_py(struct bContext *C, struct wmOperatorType *ot, struct PointerRNA *properties, struct ReportList *reports);
void WM_operator_properties_create(struct PointerRNA *ptr, const char *opstring);
void WM_operator_properties_free(struct PointerRNA *ptr);
/* operator as a python command (resultuing string must be free'd) */
char *WM_operator_pystring(struct wmOperator *op);
void WM_operator_bl_idname(char *to, const char *from);
void WM_operator_py_idname(char *to, const char *from);
/* default operator callbacks for border/circle/lasso */
int WM_border_select_invoke (struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_border_select_modal (struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_gesture_circle_invoke(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_gesture_circle_modal(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_gesture_lines_invoke(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_gesture_lines_modal(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_gesture_lasso_invoke(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_gesture_lasso_modal(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
/* default operator for arearegions, generates event */
void WM_OT_tweak_gesture(struct wmOperatorType *ot);
/* Gesture manager API */
struct wmGesture *WM_gesture_new(struct bContext *C, struct wmEvent *event, int type);
void WM_gesture_end(struct bContext *C, struct wmGesture *gesture);
/* radial control operator */
int WM_radial_control_invoke(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
int WM_radial_control_modal(struct bContext *C, struct wmOperator *op, struct wmEvent *event);
void WM_OT_radial_control_partial(struct wmOperatorType *ot);
void WM_radial_control_string(struct wmOperator *op, char str[], int maxlen);
/* fileselecting support */
void WM_event_add_fileselect(struct bContext *C, struct wmOperator *op);
void WM_event_fileselect_event(struct bContext *C, void *ophandle, int eventval);
/* OpenGL wrappers, mimicking opengl syntax */
void wmSubWindowSet (struct wmWindow *win, int swinid);
void wmSubWindowScissorSet (struct wmWindow *win, int swinid, struct rcti *srct);
void wmLoadMatrix (float mat[][4]);
void wmGetMatrix (float mat[][4]);
void wmMultMatrix (float mat[][4]);
void wmGetSingleMatrix (float mat[][4]);
void wmScale (float x, float y, float z);
void wmLoadIdentity (void); /* note: old name clear_view_mat */
void wmPushMatrix (void); /* one level only */
void wmPopMatrix (void); /* one level only */
void wmFrustum (float x1, float x2, float y1, float y2, float n, float f);
void wmOrtho (float x1, float x2, float y1, float y2, float n, float f);
void wmOrtho2 (float x1, float x2, float y1, float y2);
/* utilities */
void WM_set_framebuffer_index_color(int index);
int WM_framebuffer_to_index(unsigned int col);
/* threaded Jobs Manager */
struct wmJob *WM_jobs_get(struct wmWindowManager *wm, struct wmWindow *win, void *owner);
int WM_jobs_test(struct wmWindowManager *wm, void *owner);
void WM_jobs_customdata(struct wmJob *, void *customdata, void (*free)(void *));
void WM_jobs_timer(struct wmJob *, double timestep, unsigned int note, unsigned int endnote);
void WM_jobs_callbacks(struct wmJob *,
void (*startjob)(void *, short *, short *),
void (*initjob)(void *),
void (*update)(void *));
void WM_jobs_start(struct wmWindowManager *wm, struct wmJob *);
void WM_jobs_stop(struct wmWindowManager *wm, void *owner);
void WM_jobs_stop_all(struct wmWindowManager *wm);
/* clipboard */
char *WM_clipboard_text_get(int selection);
void WM_clipboard_text_set(char *buf, int selection);
#endif /* WM_API_H */
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