blender-archive/source/blender/blenkernel/intern/screen.c

/*
 * 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) 2001-2002 by NaN Holding BV.
 * All rights reserved.
 */

/** \file \ingroup bke
 */

#ifdef WIN32
#  include "BLI_winstuff.h"
#endif

#include <string.h>
#include <stdio.h>
#include <math.h>

#include "MEM_guardedalloc.h"

#include "DNA_scene_types.h"
#include "DNA_screen_types.h"
#include "DNA_space_types.h"
#include "DNA_view3d_types.h"
#include "DNA_workspace_types.h"

#include "BLI_math_vector.h"
#include "BLI_listbase.h"
#include "BLI_rect.h"
#include "BLI_utildefines.h"

#include "BKE_icons.h"
#include "BKE_idprop.h"
#include "BKE_screen.h"
#include "BKE_workspace.h"

/* ************ Spacetype/regiontype handling ************** */

/* keep global; this has to be accessible outside of windowmanager */
static ListBase spacetypes = {NULL, NULL};

/* not SpaceType itself */
static void spacetype_free(SpaceType *st)
{
	ARegionType *art;
	PanelType *pt;
	HeaderType *ht;

	for (art = st->regiontypes.first; art; art = art->next) {
		BLI_freelistN(&art->drawcalls);

		for (pt = art->paneltypes.first; pt; pt = pt->next) {
			if (pt->ext.free) {
				pt->ext.free(pt->ext.data);
			}

			BLI_freelistN(&pt->children);
		}

		for (ht = art->headertypes.first; ht; ht = ht->next) {
			if (ht->ext.free) {
				ht->ext.free(ht->ext.data);
			}
		}

		BLI_freelistN(&art->paneltypes);
		BLI_freelistN(&art->headertypes);
	}

	BLI_freelistN(&st->regiontypes);
}

void BKE_spacetypes_free(void)
{
	SpaceType *st;

	for (st = spacetypes.first; st; st = st->next) {
		spacetype_free(st);
	}

	BLI_freelistN(&spacetypes);
}

SpaceType *BKE_spacetype_from_id(int spaceid)
{
	SpaceType *st;

	for (st = spacetypes.first; st; st = st->next) {
		if (st->spaceid == spaceid)
			return st;
	}
	return NULL;
}

ARegionType *BKE_regiontype_from_id_or_first(SpaceType *st, int regionid)
{
	ARegionType *art;

	for (art = st->regiontypes.first; art; art = art->next)
		if (art->regionid == regionid)
			return art;

	printf("Error, region type %d missing in - name:\"%s\", id:%d\n", regionid, st->name, st->spaceid);
	return st->regiontypes.first;
}

ARegionType *BKE_regiontype_from_id(SpaceType *st, int regionid)
{
	ARegionType *art;

	for (art = st->regiontypes.first; art; art = art->next) {
		if (art->regionid == regionid) {
			return art;
		}
	}
	return NULL;
}


const ListBase *BKE_spacetypes_list(void)
{
	return &spacetypes;
}

void BKE_spacetype_register(SpaceType *st)
{
	SpaceType *stype;

	/* sanity check */
	stype = BKE_spacetype_from_id(st->spaceid);
	if (stype) {
		printf("error: redefinition of spacetype %s\n", stype->name);
		spacetype_free(stype);
		MEM_freeN(stype);
	}

	BLI_addtail(&spacetypes, st);
}

bool BKE_spacetype_exists(int spaceid)
{
	return BKE_spacetype_from_id(spaceid) != NULL;
}

/* ***************** Space handling ********************** */

void BKE_spacedata_freelist(ListBase *lb)
{
	SpaceLink *sl;
	ARegion *ar;

	for (sl = lb->first; sl; sl = sl->next) {
		SpaceType *st = BKE_spacetype_from_id(sl->spacetype);

		/* free regions for pushed spaces */
		for (ar = sl->regionbase.first; ar; ar = ar->next)
			BKE_area_region_free(st, ar);

		BLI_freelistN(&sl->regionbase);

		if (st && st->free)
			st->free(sl);
	}

	BLI_freelistN(lb);
}

static void panel_list_copy(ListBase *newlb, const ListBase *lb)
{
	BLI_listbase_clear(newlb);
	BLI_duplicatelist(newlb, lb);

	/* copy panel pointers */
	Panel *newpa = newlb->first;
	Panel *pa = lb->first;
	for (; newpa; newpa = newpa->next, pa = pa->next) {
		newpa->activedata = NULL;

		Panel *newpatab = newlb->first;
		Panel *patab = lb->first;
		while (newpatab) {
			if (newpa->paneltab == patab) {
				newpa->paneltab = newpatab;
				break;
			}
			newpatab = newpatab->next;
			patab = patab->next;
		}

		panel_list_copy(&newpa->children, &pa->children);
	}
}

ARegion *BKE_area_region_copy(SpaceType *st, ARegion *ar)
{
	ARegion *newar = MEM_dupallocN(ar);

	newar->prev = newar->next = NULL;
	BLI_listbase_clear(&newar->handlers);
	BLI_listbase_clear(&newar->uiblocks);
	BLI_listbase_clear(&newar->panels_category);
	BLI_listbase_clear(&newar->panels_category_active);
	BLI_listbase_clear(&newar->ui_lists);
	newar->visible = 0;
	newar->gizmo_map = NULL;
	newar->regiontimer = NULL;
	newar->headerstr = NULL;
	newar->draw_buffer = NULL;

	/* use optional regiondata callback */
	if (ar->regiondata) {
		ARegionType *art = BKE_regiontype_from_id(st, ar->regiontype);

		if (art && art->duplicate) {
			newar->regiondata = art->duplicate(ar->regiondata);
		}
		else if (ar->flag & RGN_FLAG_TEMP_REGIONDATA) {
			newar->regiondata = NULL;
		}
		else {
			newar->regiondata = MEM_dupallocN(ar->regiondata);
		}
	}

	if (ar->v2d.tab_offset)
		newar->v2d.tab_offset = MEM_dupallocN(ar->v2d.tab_offset);

	panel_list_copy(&newar->panels, &ar->panels);

	BLI_listbase_clear(&newar->ui_previews);
	BLI_duplicatelist(&newar->ui_previews, &ar->ui_previews);

	return newar;
}


/* from lb2 to lb1, lb1 is supposed to be freed */
static void region_copylist(SpaceType *st, ListBase *lb1, ListBase *lb2)
{
	ARegion *ar;

	/* to be sure */
	BLI_listbase_clear(lb1);

	for (ar = lb2->first; ar; ar = ar->next) {
		ARegion *arnew = BKE_area_region_copy(st, ar);
		BLI_addtail(lb1, arnew);
	}
}


/* lb1 should be empty */
void BKE_spacedata_copylist(ListBase *lb1, ListBase *lb2)
{
	SpaceLink *sl;

	BLI_listbase_clear(lb1);  /* to be sure */

	for (sl = lb2->first; sl; sl = sl->next) {
		SpaceType *st = BKE_spacetype_from_id(sl->spacetype);

		if (st && st->duplicate) {
			SpaceLink *slnew = st->duplicate(sl);

			BLI_addtail(lb1, slnew);

			region_copylist(st, &slnew->regionbase, &sl->regionbase);
		}
	}
}

/* facility to set locks for drawing to survive (render) threads accessing drawing data */
/* lock can become bitflag too */
/* should be replaced in future by better local data handling for threads */
void BKE_spacedata_draw_locks(int set)
{
	SpaceType *st;

	for (st = spacetypes.first; st; st = st->next) {
		ARegionType *art;

		for (art = st->regiontypes.first; art; art = art->next) {
			if (set)
				art->do_lock = art->lock;
			else
				art->do_lock = false;
		}
	}
}

/**
 * Version of #BKE_area_find_region_type that also works if \a slink is not the active space of \a sa.
 */
ARegion *BKE_spacedata_find_region_type(const SpaceLink *slink, const ScrArea *sa, int region_type)
{
	const bool is_slink_active = slink == sa->spacedata.first;
	const ListBase *regionbase = (is_slink_active) ?
	                           &sa->regionbase : &slink->regionbase;
	ARegion *ar = NULL;

	BLI_assert(BLI_findindex(&sa->spacedata, slink) != -1);
	for (ar = regionbase->first; ar; ar = ar->next) {
		if (ar->regiontype == region_type) {
			break;
		}
	}

	/* Should really unit test this instead. */
	BLI_assert(!is_slink_active || ar == BKE_area_find_region_type(sa, region_type));

	return ar;
}


static void (*spacedata_id_remap_cb)(struct ScrArea *sa, struct SpaceLink *sl, ID *old_id, ID *new_id) = NULL;

void BKE_spacedata_callback_id_remap_set(void (*func)(ScrArea *sa, SpaceLink *sl, ID *, ID *))
{
	spacedata_id_remap_cb = func;
}

/* UNUSED!!! */
void BKE_spacedata_id_unref(struct ScrArea *sa, struct SpaceLink *sl, struct ID *id)
{
	if (spacedata_id_remap_cb) {
		spacedata_id_remap_cb(sa, sl, id, NULL);
	}
}

/**
 * Avoid bad-level calls to #WM_gizmomap_tag_refresh.
 */
static void (*region_refresh_tag_gizmomap_callback)(struct wmGizmoMap *) = NULL;

void BKE_region_callback_refresh_tag_gizmomap_set(void (*callback)(struct wmGizmoMap *))
{
	region_refresh_tag_gizmomap_callback = callback;
}

void BKE_screen_gizmo_tag_refresh(struct bScreen *sc)
{
	if (region_refresh_tag_gizmomap_callback == NULL) {
		return;
	}

	ScrArea *sa;
	ARegion *ar;
	for (sa = sc->areabase.first; sa; sa = sa->next) {
		for (ar = sa->regionbase.first; ar; ar = ar->next) {
			if (ar->gizmo_map != NULL) {
				region_refresh_tag_gizmomap_callback(ar->gizmo_map);
			}
		}
	}
}

/**
 * Avoid bad-level calls to #WM_gizmomap_delete.
 */
static void (*region_free_gizmomap_callback)(struct wmGizmoMap *) = NULL;

void BKE_region_callback_free_gizmomap_set(void (*callback)(struct wmGizmoMap *))
{
	region_free_gizmomap_callback = callback;
}

void BKE_area_region_panels_free(ListBase *lb)
{
	Panel *pa, *pa_next;
	for (pa = lb->first; pa; pa = pa_next) {
		pa_next = pa->next;
		if (pa->activedata) {
			MEM_freeN(pa->activedata);
		}
		BKE_area_region_panels_free(&pa->children);
	}

	BLI_freelistN(lb);
}

/* not region itself */
void BKE_area_region_free(SpaceType *st, ARegion *ar)
{
	uiList *uilst;

	if (st) {
		ARegionType *art = BKE_regiontype_from_id(st, ar->regiontype);

		if (art && art->free)
			art->free(ar);

		if (ar->regiondata)
			printf("regiondata free error\n");
	}
	else if (ar->type && ar->type->free)
		ar->type->free(ar);

	if (ar->v2d.tab_offset) {
		MEM_freeN(ar->v2d.tab_offset);
		ar->v2d.tab_offset = NULL;
	}

	BKE_area_region_panels_free(&ar->panels);

	for (uilst = ar->ui_lists.first; uilst; uilst = uilst->next) {
		if (uilst->dyn_data) {
			uiListDyn *dyn_data = uilst->dyn_data;
			if (dyn_data->items_filter_flags) {
				MEM_freeN(dyn_data->items_filter_flags);
			}
			if (dyn_data->items_filter_neworder) {
				MEM_freeN(dyn_data->items_filter_neworder);
			}
			MEM_freeN(dyn_data);
		}
		if (uilst->properties) {
			IDP_FreeProperty(uilst->properties);
			MEM_freeN(uilst->properties);
		}
	}

	if (ar->gizmo_map != NULL) {
		region_free_gizmomap_callback(ar->gizmo_map);
	}

	BLI_freelistN(&ar->ui_lists);
	BLI_freelistN(&ar->ui_previews);
	BLI_freelistN(&ar->panels_category);
	BLI_freelistN(&ar->panels_category_active);
}

/* not area itself */
void BKE_screen_area_free(ScrArea *sa)
{
	SpaceType *st = BKE_spacetype_from_id(sa->spacetype);
	ARegion *ar;

	for (ar = sa->regionbase.first; ar; ar = ar->next)
		BKE_area_region_free(st, ar);

	MEM_SAFE_FREE(sa->global);
	BLI_freelistN(&sa->regionbase);

	BKE_spacedata_freelist(&sa->spacedata);

	BLI_freelistN(&sa->actionzones);
}

void BKE_screen_area_map_free(ScrAreaMap *area_map)
{
	for (ScrArea *area = area_map->areabase.first, *area_next; area; area = area_next) {
		area_next = area->next;
		BKE_screen_area_free(area);
	}

	BLI_freelistN(&area_map->vertbase);
	BLI_freelistN(&area_map->edgebase);
	BLI_freelistN(&area_map->areabase);
}

/** Free (or release) any data used by this screen (does not free the screen itself). */
void BKE_screen_free(bScreen *sc)
{
	ARegion *ar;

	/* No animdata here. */

	for (ar = sc->regionbase.first; ar; ar = ar->next)
		BKE_area_region_free(NULL, ar);

	BLI_freelistN(&sc->regionbase);

	BKE_screen_area_map_free(AREAMAP_FROM_SCREEN(sc));

	BKE_previewimg_free(&sc->preview);

	/* Region and timer are freed by the window manager. */
	MEM_SAFE_FREE(sc->tool_tip);
}

/* ***************** Screen edges & verts ***************** */

ScrEdge *BKE_screen_find_edge(bScreen *sc, ScrVert *v1, ScrVert *v2)
{
	ScrEdge *se;

	BKE_screen_sort_scrvert(&v1, &v2);
	for (se = sc->edgebase.first; se; se = se->next) {
		if (se->v1 == v1 && se->v2 == v2) {
			return se;
		}
	}

	return NULL;
}

void BKE_screen_sort_scrvert(ScrVert **v1, ScrVert **v2)
{
	ScrVert *tmp;

	if (*v1 > *v2) {
		tmp = *v1;
		*v1 = *v2;
		*v2 = tmp;
	}
}

void BKE_screen_remove_double_scrverts(bScreen *sc)
{
	ScrVert *v1, *verg;
	ScrEdge *se;
	ScrArea *sa;

	verg = sc->vertbase.first;
	while (verg) {
		if (verg->newv == NULL) { /* !!! */
			v1 = verg->next;
			while (v1) {
				if (v1->newv == NULL) {   /* !?! */
					if (v1->vec.x == verg->vec.x && v1->vec.y == verg->vec.y) {
						/* printf("doublevert\n"); */
						v1->newv = verg;
					}
				}
				v1 = v1->next;
			}
		}
		verg = verg->next;
	}

	/* replace pointers in edges and faces */
	se = sc->edgebase.first;
	while (se) {
		if (se->v1->newv) se->v1 = se->v1->newv;
		if (se->v2->newv) se->v2 = se->v2->newv;
		/* edges changed: so.... */
		BKE_screen_sort_scrvert(&(se->v1), &(se->v2));
		se = se->next;
	}
	sa = sc->areabase.first;
	while (sa) {
		if (sa->v1->newv) sa->v1 = sa->v1->newv;
		if (sa->v2->newv) sa->v2 = sa->v2->newv;
		if (sa->v3->newv) sa->v3 = sa->v3->newv;
		if (sa->v4->newv) sa->v4 = sa->v4->newv;
		sa = sa->next;
	}

	/* remove */
	verg = sc->vertbase.first;
	while (verg) {
		v1 = verg->next;
		if (verg->newv) {
			BLI_remlink(&sc->vertbase, verg);
			MEM_freeN(verg);
		}
		verg = v1;
	}

}

void BKE_screen_remove_double_scredges(bScreen *sc)
{
	ScrEdge *verg, *se, *sn;

	/* compare */
	verg = sc->edgebase.first;
	while (verg) {
		se = verg->next;
		while (se) {
			sn = se->next;
			if (verg->v1 == se->v1 && verg->v2 == se->v2) {
				BLI_remlink(&sc->edgebase, se);
				MEM_freeN(se);
			}
			se = sn;
		}
		verg = verg->next;
	}
}

void BKE_screen_remove_unused_scredges(bScreen *sc)
{
	ScrEdge *se, *sen;
	ScrArea *sa;
	int a = 0;

	/* sets flags when edge is used in area */
	sa = sc->areabase.first;
	while (sa) {
		se = BKE_screen_find_edge(sc, sa->v1, sa->v2);
		if (se == NULL) printf("error: area %d edge 1 doesn't exist\n", a);
		else se->flag = 1;
		se = BKE_screen_find_edge(sc, sa->v2, sa->v3);
		if (se == NULL) printf("error: area %d edge 2 doesn't exist\n", a);
		else se->flag = 1;
		se = BKE_screen_find_edge(sc, sa->v3, sa->v4);
		if (se == NULL) printf("error: area %d edge 3 doesn't exist\n", a);
		else se->flag = 1;
		se = BKE_screen_find_edge(sc, sa->v4, sa->v1);
		if (se == NULL) printf("error: area %d edge 4 doesn't exist\n", a);
		else se->flag = 1;
		sa = sa->next;
		a++;
	}
	se = sc->edgebase.first;
	while (se) {
		sen = se->next;
		if (se->flag == 0) {
			BLI_remlink(&sc->edgebase, se);
			MEM_freeN(se);
		}
		else {
			se->flag = 0;
		}
		se = sen;
	}
}

void BKE_screen_remove_unused_scrverts(bScreen *sc)
{
	ScrVert *sv, *svn;
	ScrEdge *se;

	/* we assume edges are ok */

	se = sc->edgebase.first;
	while (se) {
		se->v1->flag = 1;
		se->v2->flag = 1;
		se = se->next;
	}

	sv = sc->vertbase.first;
	while (sv) {
		svn = sv->next;
		if (sv->flag == 0) {
			BLI_remlink(&sc->vertbase, sv);
			MEM_freeN(sv);
		}
		else {
			sv->flag = 0;
		}
		sv = svn;
	}
}

/* ***************** Utilities ********************** */

/**
 * Find a region of type \a region_type in the currently active space of \a sa.
 *
 * \note This does _not_ work if the region to look up is not in the active
 *       space. Use #BKE_spacedata_find_region_type if that may be the case.
 */
ARegion *BKE_area_find_region_type(const ScrArea *sa, int region_type)
{
	if (sa) {
		for (ARegion *ar = sa->regionbase.first; ar; ar = ar->next) {
			if (ar->regiontype == region_type)
				return ar;
		}
	}

	return NULL;
}

ARegion *BKE_area_find_region_active_win(ScrArea *sa)
{
	if (sa) {
		ARegion *ar = BLI_findlink(&sa->regionbase, sa->region_active_win);
		if (ar && (ar->regiontype == RGN_TYPE_WINDOW)) {
			return ar;
		}

		/* fallback to any */
		return BKE_area_find_region_type(sa, RGN_TYPE_WINDOW);
	}
	return NULL;
}

ARegion *BKE_area_find_region_xy(ScrArea *sa, const int regiontype, int x, int y)
{
	ARegion *ar_found = NULL;
	if (sa) {
		ARegion *ar;
		for (ar = sa->regionbase.first; ar; ar = ar->next) {
			if ((regiontype == RGN_TYPE_ANY) || (ar->regiontype == regiontype)) {
				if (BLI_rcti_isect_pt(&ar->winrct, x, y)) {
					ar_found = ar;
					break;
				}
			}
		}
	}
	return ar_found;
}

/**
 * \note, ideally we can get the area from the context,
 * there are a few places however where this isn't practical.
 */
ScrArea *BKE_screen_find_area_from_space(struct bScreen *sc, SpaceLink *sl)
{
	ScrArea *sa;

	for (sa = sc->areabase.first; sa; sa = sa->next) {
		if (BLI_findindex(&sa->spacedata, sl) != -1) {
			break;
		}
	}

	return sa;
}

/**
 * \note Using this function is generally a last resort, you really want to be
 * using the context when you can - campbell
 */
ScrArea *BKE_screen_find_big_area(bScreen *sc, const int spacetype, const short min)
{
	ScrArea *sa, *big = NULL;
	int size, maxsize = 0;

	for (sa = sc->areabase.first; sa; sa = sa->next) {
		if ((spacetype == SPACE_TYPE_ANY) || (sa->spacetype == spacetype)) {
			if (min <= sa->winx && min <= sa->winy) {
				size = sa->winx * sa->winy;
				if (size > maxsize) {
					maxsize = size;
					big = sa;
				}
			}
		}
	}

	return big;
}

ScrArea *BKE_screen_area_map_find_area_xy(const ScrAreaMap *areamap, const int spacetype, int x, int y)
{
	for (ScrArea *sa = areamap->areabase.first; sa; sa = sa->next) {
		if (BLI_rcti_isect_pt(&sa->totrct, x, y)) {
			if ((spacetype == SPACE_TYPE_ANY) || (sa->spacetype == spacetype)) {
				return sa;
			}
			break;
		}
	}
	return NULL;
}
ScrArea *BKE_screen_find_area_xy(bScreen *sc, const int spacetype, int x, int y)
{
	return BKE_screen_area_map_find_area_xy(AREAMAP_FROM_SCREEN(sc), spacetype, x, y);
}

void BKE_screen_view3d_sync(View3D *v3d, struct Scene *scene)
{
	if (v3d->scenelock && v3d->localvd == NULL) {
		v3d->camera = scene->camera;

		if (v3d->camera == NULL) {
			ARegion *ar;

			for (ar = v3d->regionbase.first; ar; ar = ar->next) {
				if (ar->regiontype == RGN_TYPE_WINDOW) {
					RegionView3D *rv3d = ar->regiondata;
					if (rv3d->persp == RV3D_CAMOB)
						rv3d->persp = RV3D_PERSP;
				}
			}
		}
	}
}

void BKE_screen_view3d_scene_sync(bScreen *sc, Scene *scene)
{
	/* are there cameras in the views that are not in the scene? */
	ScrArea *sa;
	for (sa = sc->areabase.first; sa; sa = sa->next) {
		SpaceLink *sl;
		for (sl = sa->spacedata.first; sl; sl = sl->next) {
			if (sl->spacetype == SPACE_VIEW3D) {
				View3D *v3d = (View3D *) sl;
				BKE_screen_view3d_sync(v3d, scene);
			}
		}
	}
}

void BKE_screen_view3d_shading_init(View3DShading *shading)
{
	memset(shading, 0, sizeof(*shading));

	shading->type = OB_SOLID;
	shading->prev_type = OB_SOLID;
	shading->flag = V3D_SHADING_SPECULAR_HIGHLIGHT | V3D_SHADING_XRAY_BONE;
	shading->light = V3D_LIGHTING_STUDIO;
	shading->shadow_intensity = 0.5f;
	shading->xray_alpha = 0.5f;
	shading->xray_alpha_wire = 0.5f;
	shading->cavity_valley_factor = 1.0f;
	shading->cavity_ridge_factor = 1.0f;
	shading->curvature_ridge_factor = 1.0f;
	shading->curvature_valley_factor = 1.0f;
	copy_v3_fl(shading->single_color, 0.8f);
	copy_v3_fl(shading->background_color, 0.05f);
}

/* magic zoom calculation, no idea what
 * it signifies, if you find out, tell me! -zr
 */

/* simple, its magic dude!
 * well, to be honest, this gives a natural feeling zooming
 * with multiple keypad presses (ton)
 */
float BKE_screen_view3d_zoom_to_fac(float camzoom)
{
	return powf(((float)M_SQRT2 + camzoom / 50.0f), 2.0f) / 4.0f;
}

float BKE_screen_view3d_zoom_from_fac(float zoomfac)
{
	return ((sqrtf(4.0f * zoomfac) - (float)M_SQRT2) * 50.0f);
}

bool BKE_screen_is_fullscreen_area(const bScreen *screen)
{
	return ELEM(screen->state, SCREENMAXIMIZED, SCREENFULL);
}

bool BKE_screen_is_used(const bScreen *screen)
{
	return (screen->winid != 0);
}

void BKE_screen_header_alignment_reset(bScreen *screen)
{
	int alignment = (U.uiflag & USER_HEADER_BOTTOM) ? RGN_ALIGN_BOTTOM : RGN_ALIGN_TOP;
	for (ScrArea *sa = screen->areabase.first; sa; sa = sa->next) {
		for (ARegion *ar = sa->regionbase.first; ar; ar = ar->next) {
			if (ar->regiontype == RGN_TYPE_HEADER) {
				if (ELEM(sa->spacetype, SPACE_FILE, SPACE_USERPREF, SPACE_OUTLINER, SPACE_BUTS)) {
					ar->alignment = RGN_ALIGN_TOP;
					continue;
				}
				ar->alignment = alignment;
			}
		}
	}
}