UI:

* For new buttons spaces, automatically set horizontal/vertical
  align depending on size, instead of free.

* Cleaned up the UI panel API. There's now a new uiBeginPanel
  function which takes a panel type, and a uiEndPanel which takes
  the final size. uiNewPanel* functions will be phased out.
* Animate the re-alignment when a panel size changes, e.g. when
  enabling dupliframes.

* Load ui scripts from the release/ folder first if it is
  available. This makes it easier to edit ui scripts, since it
  will directly use the original files which avoids having to
  run the build system.
* Improve editing of panel types while blender is open. That
  means fixing some issues with lacking updates, overlaps, strange
  ordering. It even does an animation now when the panel resizes.

source/blender/blenlib/intern/util.c

@@ -831,10 +831,10 @@ char *BLI_gethome(void) {
 /* this function returns the path to a blender folder, if it exists,
  * trying in this order:
  *
- * $HOME/.blender/folder_name
- * path_to_executable/.blender/folder_name
  * path_to_executable/release/folder_name (in svn)
  * ./release/folder_name (in svn)
+ * $HOME/.blender/folder_name
+ * path_to_executable/.blender/folder_name
  *
  * returns NULL if none is found. */
 
@@ -848,12 +848,20 @@ char *BLI_gethome_folder(char *folder_name)
 	char *s;
 	int i;
 
-	if(folder_name) {
-		if(fulldir[0] != '\0')
-			return fulldir;
+	/* try path_to_executable/release/folder_name (in svn) */
+	if (folder_name) {
+		BLI_snprintf(tmpdir, sizeof(tmpdir), "release/%s", folder_name);
+		BLI_make_file_string("/", fulldir, bprogdir, tmpdir);
+		if (BLI_exists(fulldir)) return fulldir;
+		else fulldir[0] = '\0';
+	}
+
+	/* try ./release/folder_name (in svn) */
+	if(folder_name) {
+		BLI_snprintf(fulldir, sizeof(fulldir), "./release/%s", folder_name);
+		if (BLI_exists(fulldir)) return fulldir;
+		else fulldir[0] = '\0';
 	}
-	else if(homedir[0] != '\0')
-		return homedir;
 
 	/* BLI_gethome() can return NULL if env vars are not set */
 	s = BLI_gethome();
@@ -913,21 +921,6 @@ char *BLI_gethome_folder(char *folder_name)
 		else return homedir;
 	}
 
-	/* try path_to_executable/release/folder_name (in svn) */
-	if (folder_name) {
-		BLI_snprintf(tmpdir, sizeof(tmpdir), "release/%s", folder_name);
-		BLI_make_file_string("/", fulldir, bprogdir, tmpdir);
-		if (BLI_exists(fulldir)) return fulldir;
-		else fulldir[0] = '\0';
-	}
-
-	/* try ./release/folder_name (in svn) */
-	if(folder_name) {
-		BLI_snprintf(fulldir, sizeof(fulldir), "./release/%s", folder_name);
-		if (BLI_exists(fulldir)) return fulldir;
-		else fulldir[0] = '\0';
-	}
-
 	return NULL;
 }
 

source/blender/blenloader/intern/readfile.c

@@ -4460,7 +4460,7 @@ static void direct_link_region(FileData *fd, ARegion *ar, int spacetype)
 
 	for(pa= ar->panels.first; pa; pa=pa->next) {
 		pa->paneltab= newdataadr(fd, pa->paneltab);
-		pa->active= 0;
+		pa->runtime_flag= 0;
 		pa->sortcounter= 0;
 		pa->activedata= NULL;
 		pa->type= NULL;

source/blender/editors/include/UI_interface.h

@@ -481,18 +481,18 @@ void autocomplete_end(AutoComplete *autocpl, char *autoname);
  * could use a good cleanup, though how they will function in 2.5 is
  * not clear yet so we postpone that. */
 
-extern void uiNewPanelTabbed(char *, char *);
+void uiBeginPanels(const struct bContext *C, struct ARegion *ar);
+void uiEndPanels(const struct bContext *C, struct ARegion *ar);
+
+struct Panel *uiBeginPanel(struct ARegion *ar, uiBlock *block, struct PanelType *pt);
+void uiEndPanel(uiBlock *block, int width, int height);
+
+void uiPanelsHome(struct ARegion *ar);
+
+/* deprecated */
 extern int uiNewPanel(const struct bContext *C, struct ARegion *ar, uiBlock *block, char *panelname, char *tabname, int ofsx, int ofsy, int sizex, int sizey);
-
-extern void uiBeginPanels(const struct bContext *C, struct ARegion *ar);
-extern void uiEndPanels(const struct bContext *C, struct ARegion *ar);
-extern void uiFreePanels(struct ListBase *lb);
-	
-extern void uiPanelsHome(struct ARegion *ar);
-
 extern void uiNewPanelHeight(struct uiBlock *block, int sizey);
 extern void uiNewPanelTitle(struct uiBlock *block, char *str);
-struct Panel *uiPanelFromBlock(struct uiBlock *block);
 
 /* Handlers
  *

source/blender/editors/interface/interface.c

@@ -1688,9 +1688,6 @@ void uiFreeBlock(const bContext *C, uiBlock *block)
 		ui_free_but(C, but);
 	}
 
-	if(block->panel) {
-		block->panel->active= 0;
-	}
 	BLI_freelistN(&block->saferct);
 	
 	MEM_freeN(block);

source/blender/editors/interface/interface_layout.c

@@ -1216,26 +1216,26 @@ void uiRegionPanelLayout(const bContext *C, ARegion *ar, int vertical, char *con
 
 		if(pt->draw && (!pt->poll || pt->poll(C))) {
 			block= uiBeginBlock(C, ar, pt->idname, UI_EMBOSS);
-			
-			if(vertical) {
-				w= (ar->type->minsizex)? ar->type->minsizex-12: block->aspect*ar->winx-12;
-				em= (ar->type->minsizex)? 10: 20;
-			}
-			else {
-				w= (ar->type->minsizex)? ar->type->minsizex-12: UI_PANEL_WIDTH-12;
-				em= (ar->type->minsizex)? 10: 20;
-			}
+			panel= uiBeginPanel(ar, block, pt);
+
+			if(panel) {
+				if(vertical) {
+					w= (ar->type->minsizex)? ar->type->minsizex-12: block->aspect*ar->winx-12;
+					em= (ar->type->minsizex)? 10: 20;
+				}
+				else {
+					w= (ar->type->minsizex)? ar->type->minsizex-12: UI_PANEL_WIDTH-12;
+					em= (ar->type->minsizex)? 10: 20;
+				}
 
-			if(uiNewPanel(C, ar, block, pt->name, pt->name, x, y, w, 0)) {
-				panel= uiPanelFromBlock(block);
 				panel->type= pt;
-				panel->layout= uiLayoutBegin(UI_LAYOUT_VERTICAL, x, y, w, em);
+				panel->layout= uiLayoutBegin(UI_LAYOUT_VERTICAL, PNL_SAFETY, 0, w-2*PNL_SAFETY, em);
 
 				pt->draw(C, panel);
 
 				uiLayoutEnd(C, block, panel->layout, &xco, &yco);
 				panel->layout= NULL;
-				uiNewPanelHeight(block, y - yco + 12);
+				uiEndPanel(block, w, -yco + 12);
 			}
 			else {
 				w= PNL_HEADER;

source/blender/editors/interface/interface_panel.c

@@ -25,10 +25,7 @@
  * ***** END GPL LICENSE BLOCK *****
  */
 
-/* 
-     a full doc with API notes can be found in bf-blender/blender/doc/interface_API.txt
-
- */
+/* a full doc with API notes can be found in bf-blender/blender/doc/interface_API.txt */
  
 #include <math.h>
 #include <stdlib.h>
@@ -63,11 +60,16 @@
 
 #include "interface_intern.h"
 
-/* Defines */
+/*********************** defines and structs ************************/
 
 #define ANIMATION_TIME		0.30
 #define ANIMATION_INTERVAL	0.02
 
+#define PNL_LAST_ADDED		1
+#define PNL_ACTIVE			2
+#define PNL_WAS_ACTIVE		4
+#define PNL_ANIM_ALIGN		8
+
 typedef enum uiHandlePanelState {
 	PANEL_STATE_DRAG,
 	PANEL_STATE_DRAG_SCALE,
@@ -89,11 +91,10 @@ typedef struct uiHandlePanelData {
 	int startsizex, startsizey;
 } uiHandlePanelData;
 
-static void panel_activate_state(bContext *C, Panel *pa, uiHandlePanelState state);
+static void panel_activate_state(const bContext *C, Panel *pa, uiHandlePanelState state);
 
-/* ******************************** */
-
-/* temporary code to remove all sbuts stuff from panel code */
+/*********************** space specific code ************************/
+/* temporary code to remove all sbuts stuff from panel code         */
 
 static int panel_aligned(ScrArea *sa, ARegion *ar)
 {
@@ -107,26 +108,46 @@ static int panel_aligned(ScrArea *sa, ARegion *ar)
 	return 0;
 }
 
-static int panels_re_align(ScrArea *sa, ARegion *ar)
+static int panels_re_align(ScrArea *sa, ARegion *ar, Panel **r_pa)
 {
+	Panel *pa;
+	int active= 0;
+
+	*r_pa= NULL;
+
 	if(sa->spacetype==SPACE_BUTS && ar->regiontype == RGN_TYPE_WINDOW) {
 		SpaceButs *sbuts= sa->spacedata.first;
 
 		if(sbuts->align)
 			if(sbuts->re_align || sbuts->mainbo!=sbuts->mainb || sbuts->tabo!=sbuts->tab[sbuts->mainb])
 				return 1;
-
-		return 0;
 	}
 	else if(ar->regiontype==RGN_TYPE_UI)
 		return 1;
+
+	for(pa=ar->panels.first; pa; pa=pa->next) {
+		if((pa->runtime_flag & PNL_WAS_ACTIVE) && !(pa->runtime_flag & PNL_ACTIVE))
+			return 1;
+		if(!(pa->runtime_flag & PNL_WAS_ACTIVE) && (pa->runtime_flag & PNL_ACTIVE))
+			return 1;
+		if(pa->activedata)
+			active= 1;
+	}
+
+	for(pa=ar->panels.first; pa; pa=pa->next) {
+		if(pa->runtime_flag & PNL_ANIM_ALIGN) {
+			if(!active)
+				*r_pa= pa;
+			return 1;
+		}
+	}
 	
 	return 0;
 }
 
-/* ************** panels ************* */
+/****************************** panels ******************************/
 
-static void copy_panel_offset(Panel *pa, Panel *papar)
+static void ui_panel_copy_offset(Panel *pa, Panel *papar)
 {
 	/* with respect to sizes... papar is parent */
 
@@ -134,30 +155,118 @@ static void copy_panel_offset(Panel *pa, Panel *papar)
 	pa->ofsy= papar->ofsy + papar->sizey-pa->sizey;
 }
 
-/* global... but will be NULLed after each 'newPanel' call */
-static char *panel_tabbed=NULL, *group_tabbed=NULL;
-
-void uiNewPanelTabbed(char *panelname, char *groupname)
+Panel *uiBeginPanel(ARegion *ar, uiBlock *block, PanelType *pt)
 {
-	panel_tabbed= panelname;
-	group_tabbed= groupname;
+	Panel *pa, *patab, *palast;
+	char *panelname= pt->name;
+	char *tabname= pt->name;
+	char *hookname= NULL;
+	
+	/* check if Panel exists, then use that one */
+	for(pa=ar->panels.first; pa; pa=pa->next)
+		if(strncmp(pa->panelname, panelname, UI_MAX_NAME_STR)==0)
+			if(strncmp(pa->tabname, tabname, UI_MAX_NAME_STR)==0)
+				break;
+	
+	if(pa) {
+		pa->type= pt;
+		BLI_remlink(&ar->panels, pa);
+	}
+	else {
+		/* new panel */
+		pa= MEM_callocN(sizeof(Panel), "new panel");
+		pa->type= pt;
+		BLI_strncpy(pa->panelname, panelname, UI_MAX_NAME_STR);
+		BLI_strncpy(pa->tabname, tabname, UI_MAX_NAME_STR);
+	
+		pa->ofsx= PNL_DIST;
+		pa->ofsy= PNL_DIST;
+		pa->sizex= 0;
+		pa->sizey= 0;
+		
+		/* make new Panel tabbed? */
+		if(hookname) {
+			for(patab= ar->panels.first; patab; patab= patab->next) {
+				if((patab->runtime_flag & PNL_ACTIVE) && patab->paneltab==NULL) {
+					if(strncmp(hookname, patab->panelname, UI_MAX_NAME_STR)==0) {
+						if(strncmp(tabname, patab->tabname, UI_MAX_NAME_STR)==0) {
+							pa->paneltab= patab;
+							ui_panel_copy_offset(pa, patab);
+							break;
+						}
+					}
+				}
+			} 
+		}
+	}
+
+	/* insert panel into list and set sort counter */
+	pa->runtime_flag |= PNL_LAST_ADDED;
+
+	for(palast=ar->panels.first; palast; palast=palast->next)
+		if(palast->runtime_flag & PNL_LAST_ADDED)
+			break;
+
+	if(palast) {
+		palast->runtime_flag &= ~PNL_LAST_ADDED;
+		pa->sortcounter= palast->sortcounter+1;
+		BLI_insertlink(&ar->panels, palast, pa);
+	}
+	else {
+		pa->sortcounter= 0;
+		BLI_addtail(&ar->panels, pa);
+	}
+
+	/* assign to block */
+	block->panel= pa;
+	pa->runtime_flag |= PNL_ACTIVE;
+
+	if(pa->paneltab) return NULL;
+	if(pa->flag & PNL_CLOSED) return NULL;
+
+	/* the 'return 0' above makes this to be in end. otherwise closes panels show wrong title */
+	pa->drawname[0]= 0;
+	
+	return pa;
 }
 
-/* another global... */
-static int pnl_control= UI_PNL_TRANSP;
-
-void uiPanelControl(int control)
+void uiEndPanel(uiBlock *block, int width, int height)
 {
-	pnl_control= control;
+	Panel *pa= block->panel;
+
+	if(pa->sizex != width || pa->sizey != height) {
+		pa->runtime_flag |= PNL_ANIM_ALIGN;
+		pa->ofsy += pa->sizey-height;
+	}
+
+	pa->sizex= width;
+	pa->sizey= height;
 }
 
-/* another global... */
-static int pnl_handler= 0;
-
-void uiSetPanelHandler(int handler)
+#if 0
+void uiPanelToMouse(const bContext *C, Panel *pa)
 {
-	pnl_handler= handler;
+	/* global control over this feature; UI_PNL_TO_MOUSE only called for hotkey panels */
+	if(U.uiflag & USER_PANELPINNED);
+	else if(pa->control & UI_PNL_TO_MOUSE) {
+		int mx, my;
+
+		mx= CTX_wm_window(C)->eventstate->x;
+		my= CTX_wm_window(C)->eventstate->y;
+		
+		pa->ofsx= mx-pa->sizex/2;
+		pa->ofsy= my-pa->sizey/2;
+		
+		if(pa->flag & PNL_CLOSED) pa->flag &= ~PNL_CLOSED;
+	}
+	
+	if(pa->control & UI_PNL_UNSTOW) {
+		if(pa->flag & PNL_CLOSEDY) {
+			pa->flag &= ~PNL_CLOSED;
+		}
+	}
 }
+#endif
 
 /* ofsx/ofsy only used for new panel definitions */
 /* return 1 if visible (create buttons!) */
@@ -194,6 +303,7 @@ int uiNewPanel(const bContext *C, ARegion *ar, uiBlock *block, char *panelname,
 		pa->sizex= sizex;
 		pa->sizey= sizey;
 		
+#if 0
 		/* make new Panel tabbed? */
 		if(panel_tabbed && group_tabbed) {
 			Panel *papar;
@@ -209,36 +319,16 @@ int uiNewPanel(const bContext *C, ARegion *ar, uiBlock *block, char *panelname,
 				}
 			} 
 		}
+#endif
 	}
 
 	block->panel= pa;
-	pa->active= 1;
-	pa->control= pnl_control;
-	
-	/* global control over this feature; UI_PNL_TO_MOUSE only called for hotkey panels */
-	if(U.uiflag & USER_PANELPINNED);
-	else if(pnl_control & UI_PNL_TO_MOUSE) {
-		int mx, my;
+	pa->runtime_flag |= PNL_ACTIVE;
 
-		mx= CTX_wm_window(C)->eventstate->x;
-		my= CTX_wm_window(C)->eventstate->y;
-		
-		pa->ofsx= mx-pa->sizex/2;
-		pa->ofsy= my-pa->sizey/2;
-		
-		if(pa->flag & PNL_CLOSED) pa->flag &= ~PNL_CLOSED;
-	}
-	
-	if(pnl_control & UI_PNL_UNSTOW) {
-		if(pa->flag & PNL_CLOSEDY) {
-			pa->flag &= ~PNL_CLOSED;
-		}
-	}
-	
 	/* clear ugly globals */
-	panel_tabbed= group_tabbed= NULL;
-	pnl_handler= 0;
-	pnl_control= UI_PNL_TRANSP; // back to default
+	// XXX pa->control= pnl_control;
+	// XXX panel_tabbed= group_tabbed= NULL;
+	// XXX pa->control= UI_PNL_TRANSP; // back to default
 	
 	if(pa->paneltab) return 0;
 	if(pa->flag & PNL_CLOSED) return 0;
@@ -249,16 +339,6 @@ int uiNewPanel(const bContext *C, ARegion *ar, uiBlock *block, char *panelname,
 	return 1;
 }
 
-Panel *uiPanelFromBlock(uiBlock *block)
-{
-	return block->panel;
-}
-
-void uiFreePanels(ListBase *lb)
-{
-	BLI_freelistN(lb);
-}
-
 void uiNewPanelHeight(uiBlock *block, int sizey)
 {
 	if(sizey<0) sizey= 0;
@@ -282,7 +362,7 @@ static int panel_has_tabs(ARegion *ar, Panel *panel)
 	if(panel==NULL) return 0;
 	
 	while(pa) {
-		if(pa->active && pa->paneltab==panel) {
+		if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==panel) {
 			return 1;
 		}
 		pa= pa->next;
@@ -301,31 +381,28 @@ static void ui_scale_panel_block(uiBlock *block)
 	/* buttons min/max centered, offset calculated */
 	ui_bounds_block(block);
 
-	if( block->maxx-block->minx > block->panel->sizex - 2*PNL_SAFETY ) {
-		facx= (block->panel->sizex - (2*PNL_SAFETY))/( block->maxx-block->minx );
-	}
-	else centerx= (block->panel->sizex-( block->maxx-block->minx ) - 2*PNL_SAFETY)/2;
+	if((!block->panel->type) && block->maxx-block->minx > block->panel->sizex - 2*PNL_SAFETY)
+		facx= (block->panel->sizex - (2*PNL_SAFETY))/(block->maxx-block->minx);
+	else
+		centerx= (block->panel->sizex-(block->maxx-block->minx) - 2*PNL_SAFETY)/2;
 	
 	// tabsy= PNL_HEADER*panel_has_tabs(block->panel);
-	if( (block->maxy-block->miny) > block->panel->sizey - 2*PNL_SAFETY - tabsy) {
-		facy= (block->panel->sizey - (2*PNL_SAFETY) - tabsy)/( block->maxy-block->miny );
-	}
-	else topy= (block->panel->sizey- 2*PNL_SAFETY - tabsy) - ( block->maxy-block->miny ) ;
+	if((!block->panel->type) && (block->maxy-block->miny) > block->panel->sizey - 2*PNL_SAFETY - tabsy)
+		facy= (block->panel->sizey - (2*PNL_SAFETY) - tabsy)/(block->maxy-block->miny);
+	else
+		topy= (block->panel->sizey- 2*PNL_SAFETY - tabsy) - (block->maxy-block->miny) ;
 
-	but= block->buttons.first;
-	while(but) {
+	for(but= block->buttons.first; but; but=but->next) {
 		but->x1= PNL_SAFETY+centerx+ facx*(but->x1-block->minx);
 		but->y1= PNL_SAFETY+topy   + facy*(but->y1-block->miny);
 		but->x2= PNL_SAFETY+centerx+ facx*(but->x2-block->minx);
 		but->y2= PNL_SAFETY+topy   + facy*(but->y2-block->miny);
 		if(facx!=1.0) ui_check_but(but);	/* for strlen */
-		but= but->next;
 	}
 
 	block->maxx= block->panel->sizex;
 	block->maxy= block->panel->sizey;
 	block->minx= block->miny= 0.0;
-	
 }
 
 // for 'home' key
@@ -340,7 +417,7 @@ void uiPanelsHome(ARegion *ar)
 	v2d= &ar->v2d;
 	
 	for(pa= ar->panels.first; pa; pa=pa->next) {
-		if(pa->active && pa->paneltab==NULL) {
+		if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==NULL) {
 			done= 1;
 			if(pa->ofsx < minx) minx= pa->ofsx;
 			if(pa->ofsx+pa->sizex > maxx) maxx= pa->ofsx+pa->sizex;
@@ -387,7 +464,7 @@ static void ui_panels_update_totrct(ARegion *ar)
 	v2d->tot.ymin= -ar->winy;
 	
 	for(pa= ar->panels.first; pa; pa=pa->next) {
-		if(pa->active && pa->paneltab==NULL) {
+		if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==NULL) {
 			done= 1;
 
 			if(pa->ofsx < v2d->tot.xmin)
@@ -414,6 +491,25 @@ static void ui_panels_update_totrct(ARegion *ar)
 	UI_view2d_totRect_set(v2d, v2d->tot.xmax, v2d->tot.ymin);
 }
 
+uiBlock *uiFindOpenPanelBlockName(ListBase *lb, char *name)
+{
+	uiBlock *block;
+	Panel *pa;
+	
+	for(block= lb->first; block; block= block->next) {
+		pa= block->panel;
+
+		if(pa && (pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==NULL) {
+			if(pa->flag & PNL_CLOSED);
+			else if(strncmp(name, pa->panelname, UI_MAX_NAME_STR)==0) break;
+		}
+	}
+
+	return block;
+}
+
+/**************************** drawing *******************************/
+
 /* extern used by previewrender */
 void uiPanelPush(uiBlock *block)
 {
@@ -428,27 +524,14 @@ void uiPanelPop(uiBlock *block)
 	glPopMatrix();
 }
 
-uiBlock *uiFindOpenPanelBlockName(ListBase *lb, char *name)
-{
-	uiBlock *block;
-	
-	for(block= lb->first; block; block= block->next) {
-		if(block->panel && block->panel->active && block->panel->paneltab==NULL) {
-			if(block->panel->flag & PNL_CLOSED);
-			else if(strncmp(name, block->panel->panelname, UI_MAX_NAME_STR)==0) break;
-		}
-	}
-	return block;
-}
-
 /* triangle 'icon' for panel header */
 void ui_draw_tria_icon(float x, float y, char dir)
 {
 	if(dir=='h') {
-		ui_draw_anti_tria( x-1, y, x-1, y+11.0, x+9, y+6.25);
+		ui_draw_anti_tria(x-1, y, x-1, y+11.0, x+9, y+6.25);
 	}
 	else {
-		ui_draw_anti_tria( x-3, y+10,  x+8-1, y+10, x+4.25-2, y);	
+		ui_draw_anti_tria(x-3, y+10,  x+8-1, y+10, x+4.25-2, y);	
 	}
 }
 
@@ -469,8 +552,8 @@ void ui_draw_anti_x(float x1, float y1, float x2, float y2)
 {
 
 	/* set antialias line */
-	glEnable( GL_LINE_SMOOTH );
-	glEnable( GL_BLEND );
+	glEnable(GL_LINE_SMOOTH);
+	glEnable(GL_BLEND);
 
 	glLineWidth(2.0);
 	
@@ -479,8 +562,8 @@ void ui_draw_anti_x(float x1, float y1, float x2, float y2)
 	
 	glLineWidth(1.0);
 	
-	glDisable( GL_LINE_SMOOTH );
-	glDisable( GL_BLEND );
+	glDisable(GL_LINE_SMOOTH);
+	glDisable(GL_BLEND);
 	
 }
 
@@ -489,7 +572,7 @@ static void ui_draw_x_icon(float x, float y)
 {
 	UI_ThemeColor(TH_TEXT_HI);
 
-	ui_draw_anti_x( x, y, x+9.375, y+9.375);
+	ui_draw_anti_x(x, y, x+9.375, y+9.375);
 
 }
 
@@ -558,7 +641,7 @@ static void ui_draw_panel_header_style(ARegion *ar, uiStyle *style, uiBlock *blo
 	
 	/* count */
 	for(pa= ar->panels.first; pa; pa=pa->next)
-		if(pa->active)
+		if(pa->runtime_flag & PNL_ACTIVE)
 			if(pa->paneltab==panel)
 				nr++;
 	
@@ -583,7 +666,7 @@ static void ui_draw_panel_header_style(ARegion *ar, uiStyle *style, uiBlock *blo
 	for(pa= ar->panels.first; pa; pa=pa->next) {
 		panelname= pa->drawname[0]?pa->drawname:pa->panelname;
 		
-		if(pa->active && (pa==panel || pa->paneltab==panel)) {
+		if((pa->runtime_flag & PNL_ACTIVE) && (pa==panel || pa->paneltab==panel)) {
 			float col[3];
 			
 			UI_GetThemeColor3fv(TH_TEXT, col);
@@ -625,7 +708,7 @@ void ui_draw_panel(ARegion *ar, uiStyle *style, uiBlock *block, rcti *rect)
 	int ofsx;
 	
 	if(panel->paneltab) return;
-	
+
 	/* calculate header rect */
 	headrect= *rect;
 	headrect.ymin= headrect.ymax;
@@ -634,7 +717,7 @@ void ui_draw_panel(ARegion *ar, uiStyle *style, uiBlock *block, rcti *rect)
 	/* divider only when there's a previous panel */
 	prev= panel->prev;
 	while(prev) {
-		if(prev->active) break;
+		if(prev->runtime_flag & PNL_ACTIVE) break;
 		prev= prev->prev;
 	}
 	
@@ -733,9 +816,7 @@ void ui_draw_panel(ARegion *ar, uiStyle *style, uiBlock *block, rcti *rect)
 	
 }
 
-
-/* ------------ panel alignment ---------------- */
-
+/************************** panel alignment *************************/
 
 /* this function is needed because uiBlock and Panel itself dont
 change sizey or location when closed */
@@ -754,7 +835,6 @@ static int get_panel_real_ofsx(Panel *pa)
 	else return pa->ofsx+pa->sizex;
 }
 
-
 typedef struct PanelSort {
 	Panel *pa, *orig;
 } PanelSort;
@@ -769,10 +849,10 @@ static int find_leftmost_panel(const void *a1, const void *a2)
 {
 	const PanelSort *ps1=a1, *ps2=a2;
 	
-	if( ps1->pa->ofsx > ps2->pa->ofsx) return 1;
-	else if( ps1->pa->ofsx < ps2->pa->ofsx) return -1;
-	else if( ps1->pa->sortcounter > ps2->pa->sortcounter) return 1;
-	else if( ps1->pa->sortcounter < ps2->pa->sortcounter) return -1;
+	if(ps1->pa->ofsx > ps2->pa->ofsx) return 1;
+	else if(ps1->pa->ofsx < ps2->pa->ofsx) return -1;
+	else if(ps1->pa->sortcounter > ps2->pa->sortcounter) return 1;
+	else if(ps1->pa->sortcounter < ps2->pa->sortcounter) return -1;
 
 	return 0;
 }
@@ -782,10 +862,20 @@ static int find_highest_panel(const void *a1, const void *a2)
 {
 	const PanelSort *ps1=a1, *ps2=a2;
 	
-	if( ps1->pa->ofsy+ps1->pa->sizey < ps2->pa->ofsy+ps2->pa->sizey) return 1;
-	else if( ps1->pa->ofsy+ps1->pa->sizey > ps2->pa->ofsy+ps2->pa->sizey) return -1;
-	else if( ps1->pa->sortcounter > ps2->pa->sortcounter) return 1;
-	else if( ps1->pa->sortcounter < ps2->pa->sortcounter) return -1;
+	if(ps1->pa->ofsy+ps1->pa->sizey < ps2->pa->ofsy+ps2->pa->sizey) return 1;
+	else if(ps1->pa->ofsy+ps1->pa->sizey > ps2->pa->ofsy+ps2->pa->sizey) return -1;
+	else if(ps1->pa->sortcounter > ps2->pa->sortcounter) return 1;
+	else if(ps1->pa->sortcounter < ps2->pa->sortcounter) return -1;
+	
+	return 0;
+}
+
+static int compare_panel(const void *a1, const void *a2)
+{
+	const PanelSort *ps1=a1, *ps2=a2;
+	
+	if(ps1->pa->sortcounter > ps2->pa->sortcounter) return 1;
+	else if(ps1->pa->sortcounter < ps2->pa->sortcounter) return -1;
 	
 	return 0;
 }
@@ -796,64 +886,61 @@ int uiAlignPanelStep(ScrArea *sa, ARegion *ar, float fac)
 {
 	Panel *pa;
 	PanelSort *ps, *panelsort, *psnext;
-	static int sortcounter= 0;
 	int a, tot=0, done;
 	int align= panel_aligned(sa, ar);
 	
-	/* count active, not tabbed Panels */
-	for(pa= ar->panels.first; pa; pa= pa->next) {
-		if(pa->active && pa->paneltab==NULL) tot++;
-	}
+	/* count active, not tabbed panels */
+	for(pa= ar->panels.first; pa; pa= pa->next)
+		if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==NULL)
+			tot++;
 
 	if(tot==0) return 0;
 
 	/* extra; change close direction? */
 	for(pa= ar->panels.first; pa; pa= pa->next) {
-		if(pa->active && pa->paneltab==NULL) {
-			if( (pa->flag & PNL_CLOSEDX) && (align==BUT_VERTICAL) )
+		if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==NULL) {
+			if((pa->flag & PNL_CLOSEDX) && (align==BUT_VERTICAL))
 				pa->flag ^= PNL_CLOSED;
-			
-			else if( (pa->flag & PNL_CLOSEDY) && (align==BUT_HORIZONTAL) )
+			else if((pa->flag & PNL_CLOSEDY) && (align==BUT_HORIZONTAL))
 				pa->flag ^= PNL_CLOSED;
-			
 		}
 	}
 
-	panelsort= MEM_callocN( tot*sizeof(PanelSort), "panelsort");
+	/* sort panels */
+	panelsort= MEM_callocN(tot*sizeof(PanelSort), "panelsort");
 	
-	/* fill panelsort array */
 	ps= panelsort;
 	for(pa= ar->panels.first; pa; pa= pa->next) {
-		if(pa->active && pa->paneltab==NULL) {
+		if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==NULL) {
 			ps->pa= MEM_dupallocN(pa);
 			ps->orig= pa;
 			ps++;
 		}
 	}
 	
+#if 0
 	if(align==BUT_VERTICAL) 
 		qsort(panelsort, tot, sizeof(PanelSort), find_highest_panel);
 	else
 		qsort(panelsort, tot, sizeof(PanelSort), find_leftmost_panel);
+#endif
+	qsort(panelsort, tot, sizeof(PanelSort), compare_panel);
 	
 	/* no smart other default start loc! this keeps switching f5/f6/etc compatible */
 	ps= panelsort;
 	ps->pa->ofsx= PNL_DIST;
-	if(align==BUT_VERTICAL)
-		ps->pa->ofsy= -ps->pa->sizey-PNL_HEADER-PNL_DIST;
-	else
-		ps->pa->ofsy= -ps->pa->sizey-PNL_HEADER-PNL_DIST; // XXX was 0;
+	ps->pa->ofsy= -ps->pa->sizey-PNL_HEADER-PNL_DIST;
 
-	for(a=0 ; a<tot-1; a++, ps++) {
+	for(a=0; a<tot-1; a++, ps++) {
 		psnext= ps+1;
 	
 		if(align==BUT_VERTICAL) {
-			psnext->pa->ofsx = ps->pa->ofsx;
-			psnext->pa->ofsy = get_panel_real_ofsy(ps->pa) - psnext->pa->sizey-PNL_HEADER-PNL_DIST;
+			psnext->pa->ofsx= ps->pa->ofsx;
+			psnext->pa->ofsy= get_panel_real_ofsy(ps->pa) - psnext->pa->sizey-PNL_HEADER-PNL_DIST;
 		}
 		else {
-			psnext->pa->ofsx = get_panel_real_ofsx(ps->pa)+PNL_DIST;
-			psnext->pa->ofsy = ps->pa->ofsy + ps->pa->sizey - psnext->pa->sizey;
+			psnext->pa->ofsx= get_panel_real_ofsx(ps->pa)+PNL_DIST;
+			psnext->pa->ofsy= ps->pa->ofsy + ps->pa->sizey - psnext->pa->sizey;
 		}
 	}
 	
@@ -871,17 +958,9 @@ int uiAlignPanelStep(ScrArea *sa, ARegion *ar, float fac)
 	}
 
 	/* copy locations to tabs */
-	for(pa= ar->panels.first; pa; pa= pa->next) {
-		if(pa->paneltab && pa->active) {
-			copy_panel_offset(pa, pa->paneltab);
-		}
-	}
-
-	/* set counter, used for sorting with newly added panels */
-	sortcounter++;
 	for(pa= ar->panels.first; pa; pa= pa->next)
-		if(pa->active)
-			pa->sortcounter= sortcounter;
+		if(pa->paneltab && (pa->runtime_flag & PNL_ACTIVE))
+			ui_panel_copy_offset(pa, pa->paneltab);
 
 	/* free panelsort array */
 	for(ps= panelsort, a=0; a<tot; a++, ps++)
@@ -892,7 +971,7 @@ int uiAlignPanelStep(ScrArea *sa, ARegion *ar, float fac)
 }
 
 
-static void ui_do_animate(bContext *C, Panel *panel)
+static void ui_do_animate(const bContext *C, Panel *panel)
 {
 	uiHandlePanelData *data= panel->activedata;
 	ScrArea *sa= CTX_wm_area(C);
@@ -909,7 +988,7 @@ static void ui_do_animate(bContext *C, Panel *panel)
 	else
 		fac= 1.0f;
 
-	if(fac == 1.0f) {
+	if(fac >= 1.0f) {
 		panel_activate_state(C, panel, PANEL_STATE_EXIT);
 		return;
 	}
@@ -921,8 +1000,12 @@ void uiBeginPanels(const bContext *C, ARegion *ar)
   
   	/* set all panels as inactive, so that at the end we know
 	 * which ones were used */
-	for(pa=ar->panels.first; pa; pa=pa->next)
-		pa->active= 0;
+	for(pa=ar->panels.first; pa; pa=pa->next) {
+		if(pa->runtime_flag & PNL_ACTIVE)
+			pa->runtime_flag= PNL_WAS_ACTIVE;
+		else
+			pa->runtime_flag= 0;
+	}
 }
 
 /* only draws blocks with panels */
@@ -930,7 +1013,7 @@ void uiEndPanels(const bContext *C, ARegion *ar)
 {
 	ScrArea *sa= CTX_wm_area(C);
 	uiBlock *block;
-	Panel *panot, *panew, *patest;
+	Panel *panot, *panew, *patest, *pa;
 	
 	/* scaling contents */
 	for(block= ar->uiblocks.first; block; block= block->next)
@@ -939,10 +1022,10 @@ void uiEndPanels(const bContext *C, ARegion *ar)
 
 	/* consistancy; are panels not made, whilst they have tabs */
 	for(panot= ar->panels.first; panot; panot= panot->next) {
-		if(panot->active==0) { // not made
+		if((panot->runtime_flag & PNL_ACTIVE)==0) { // not made
 
 			for(panew= ar->panels.first; panew; panew= panew->next) {
-				if(panew->active) {
+				if((panew->runtime_flag & PNL_ACTIVE)) {
 					if(panew->paneltab==panot) { // panew is tab in notmade pa
 						break;
 					}
@@ -962,9 +1045,13 @@ void uiEndPanels(const bContext *C, ARegion *ar)
 		}	
 	}
 
-	/* re-align */
-	if(panels_re_align(sa, ar))
-		uiAlignPanelStep(sa, ar, 1.0);
+	/* re-align, possibly with animation */
+	if(panels_re_align(sa, ar, &pa)) {
+		if(pa)
+			panel_activate_state(C, pa, PANEL_STATE_ANIMATION);
+		else
+			uiAlignPanelStep(sa, ar, 1.0);
+	}
 	
 	if(sa->spacetype!=SPACE_BUTS) {
 #if 0 // XXX make float panel exception
@@ -1017,7 +1104,7 @@ void uiEndPanels(const bContext *C, ARegion *ar)
 					dx= sa->winx-maxx;
 					block->panel->snap |= PNL_SNAP_RIGHT;
 				}				
-				if( minx + dx < 0.0) dx= -minx; // when panel cant fit, put it fixed here
+				if(minx + dx < 0.0) dx= -minx; // when panel cant fit, put it fixed here
 				
 				/* check top and bottom edges */
 				if ((miny_panel < PNL_SNAP_DIST) && (miny_panel > -PNL_SNAP_DIST)) {
@@ -1032,7 +1119,7 @@ void uiEndPanels(const bContext *C, ARegion *ar)
 					dy= sa->winy-maxy;
 					block->panel->snap |= PNL_SNAP_TOP;
 				}
-				if( miny + dy < 0.0) dy= -miny; // when panel cant fit, put it fixed here
+				if(miny + dy < 0.0) dy= -miny; // when panel cant fit, put it fixed here
 
 				
 				block->panel->ofsx+= dx/sl->blockscale;
@@ -1040,7 +1127,7 @@ void uiEndPanels(const bContext *C, ARegion *ar)
 
 				/* copy locations */
 				for(patest= ar->panels.first; patest; patest= patest->next) {
-					if(patest->paneltab==block->panel) copy_panel_offset(patest, block->panel);
+					if(patest->paneltab==block->panel) ui_panel_copy_offset(patest, block->panel);
 				}
 				
 			}
@@ -1078,18 +1165,18 @@ static void check_panel_overlap(ARegion *ar, Panel *panel)
 	for(pa=ar->panels.first; pa; pa=pa->next) {
 		pa->flag &= ~PNL_OVERLAP;
 		if(panel && (pa != panel)) {
-			if(pa->paneltab==NULL && pa->active) {
+			if(pa->paneltab==NULL && (pa->runtime_flag & PNL_ACTIVE)) {
 				float safex= 0.2, safey= 0.2;
 				
-				if( pa->flag & PNL_CLOSEDX) safex= 0.05;
+				if(pa->flag & PNL_CLOSEDX) safex= 0.05;
 				else if(pa->flag & PNL_CLOSEDY) safey= 0.05;
-				else if( panel->flag & PNL_CLOSEDX) safex= 0.05;
+				else if(panel->flag & PNL_CLOSEDX) safex= 0.05;
 				else if(panel->flag & PNL_CLOSEDY) safey= 0.05;
 				
-				if( pa->ofsx > panel->ofsx- safex*panel->sizex)
-				if( pa->ofsx+pa->sizex < panel->ofsx+ (1.0+safex)*panel->sizex)
-				if( pa->ofsy > panel->ofsy- safey*panel->sizey)
-				if( pa->ofsy+pa->sizey < panel->ofsy+ (1.0+safey)*panel->sizey)
+				if(pa->ofsx > panel->ofsx- safex*panel->sizex)
+				if(pa->ofsx+pa->sizex < panel->ofsx+ (1.0+safex)*panel->sizex)
+				if(pa->ofsy > panel->ofsy- safey*panel->sizey)
+				if(pa->ofsy+pa->sizey < panel->ofsy+ (1.0+safey)*panel->sizey)
 					pa->flag |= PNL_OVERLAP;
 			}
 		}
@@ -1103,7 +1190,7 @@ static void test_add_new_tabs(ARegion *ar)
 	
 	pa= ar->panels.first;
 	while(pa) {
-		if(pa->active) {
+		if(pa->runtime_flag & PNL_ACTIVE) {
 			if(pa->flag & PNL_SELECT) pasel= pa;
 			if(pa->flag & PNL_OVERLAP) palap= pa;
 		}
@@ -1116,7 +1203,7 @@ static void test_add_new_tabs(ARegion *ar)
 		pa= ar->panels.first;
 		while(pa) {
 			if(pa->paneltab==pasel) {
-				copy_panel_offset(pa, pasel);
+				ui_panel_copy_offset(pa, pasel);
 			}
 			pa= pa->next;
 		}
@@ -1128,13 +1215,13 @@ static void test_add_new_tabs(ARegion *ar)
 	palap->paneltab= pasel;
 	
 	/* the selected panel gets coords of overlapped one */
-	copy_panel_offset(pasel, palap);
+	ui_panel_copy_offset(pasel, palap);
 
 	/* and its tabs */
 	pa= ar->panels.first;
 	while(pa) {
 		if(pa->paneltab == pasel) {
-			copy_panel_offset(pa, palap);
+			ui_panel_copy_offset(pa, palap);
 		}
 		pa= pa->next;
 	}
@@ -1149,9 +1236,9 @@ static void test_add_new_tabs(ARegion *ar)
 	}
 }
 
-/* ------------ panel drag ---------------- */
+/************************ panel dragging ****************************/
 
-static void ui_do_drag(bContext *C, wmEvent *event, Panel *panel)
+static void ui_do_drag(const bContext *C, wmEvent *event, Panel *panel)
 {
 	uiHandlePanelData *data= panel->activedata;
 	ScrArea *sa= CTX_wm_area(C);
@@ -1168,13 +1255,11 @@ static void ui_do_drag(bContext *C, wmEvent *event, Panel *panel)
 	if(data->state == PANEL_STATE_DRAG_SCALE) {
 		panel->sizex = MAX2(data->startsizex+dx, UI_PANEL_MINX);
 		
-		if(data->startsizey-dy < UI_PANEL_MINY) {
+		if(data->startsizey-dy < UI_PANEL_MINY)
 			dy= -UI_PANEL_MINY+data->startsizey;
-		}
-		panel->sizey = data->startsizey-dy;
-		
-		panel->ofsy= data->startofsy+dy;
 
+		panel->sizey= data->startsizey-dy;
+		panel->ofsy= data->startofsy+dy;
 	}
 	else {
 		/* reset the panel snapping, to allow dragging away from snapped edges */
@@ -1190,7 +1275,7 @@ static void ui_do_drag(bContext *C, wmEvent *event, Panel *panel)
 	ED_region_tag_redraw(ar);
 }
 
-static void ui_do_untab(bContext *C, wmEvent *event, Panel *panel)
+static void ui_do_untab(const bContext *C, wmEvent *event, Panel *panel)
 {
 	uiHandlePanelData *data= panel->activedata;
 	ARegion *ar= CTX_wm_region(C);
@@ -1219,20 +1304,20 @@ static void ui_do_untab(bContext *C, wmEvent *event, Panel *panel)
 	}
 }
 
-/* region level panel interaction */
+/******************* region level panel interaction *****************/
 
-static void panel_clicked_tabs(bContext *C, ScrArea *sa, ARegion *ar, uiBlock *block,  int mousex)
+static void panel_clicked_tabs(const bContext *C, ScrArea *sa, ARegion *ar, uiBlock *block,  int mousex)
 {
 	Panel *pa, *tabsel=NULL, *panel= block->panel;
 	int nr= 1, a, width, ofsx;
 	
 	ofsx= PNL_ICON;
-	if(block->panel->control & UI_PNL_CLOSE) ofsx+= PNL_ICON;
+	if(block->panel->type && (block->panel->control & UI_PNL_CLOSE)) ofsx+= PNL_ICON;
 	
 	/* count */
 	for(pa= ar->panels.first; pa; pa=pa->next)
 		if(pa!=panel)
-			if(pa->active && pa->paneltab==panel)
+			if((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==panel)
 				nr++;
 
 	if(nr==1) return;
@@ -1242,8 +1327,8 @@ static void panel_clicked_tabs(bContext *C, ScrArea *sa, ARegion *ar, uiBlock *b
 	width= (int)((float)(panel->sizex - ofsx-10)/nr);
 	pa= ar->panels.first;
 	while(pa) {
-		if(pa==panel || (pa->active && pa->paneltab==panel)) {
-			if( (mousex > ofsx+a*width) && (mousex < ofsx+(a+1)*width) ) {
+		if(pa==panel || ((pa->runtime_flag & PNL_ACTIVE) && pa->paneltab==panel)) {
+			if((mousex > ofsx+a*width) && (mousex < ofsx+(a+1)*width)) {
 				tabsel= pa;
 				break;
 			}
@@ -1269,8 +1354,8 @@ static void panel_clicked_tabs(bContext *C, ScrArea *sa, ARegion *ar, uiBlock *b
 			
 			/* copy locations to tabs */
 			for(pa= ar->panels.first; pa; pa= pa->next) {
-				if(pa->paneltab && pa->active) {
-					copy_panel_offset(pa, pa->paneltab);
+				if(pa->paneltab && pa->runtime_flag & PNL_ACTIVE) {
+					ui_panel_copy_offset(pa, pa->paneltab);
 				}
 			}
 			
@@ -1286,7 +1371,7 @@ static void panel_clicked_tabs(bContext *C, ScrArea *sa, ARegion *ar, uiBlock *b
 
 /* this function is supposed to call general window drawing too */
 /* also it supposes a block has panel, and isnt a menu */
-static void ui_handle_panel_header(bContext *C, uiBlock *block, int mx, int my)
+static void ui_handle_panel_header(const bContext *C, uiBlock *block, int mx, int my)
 {
 	ScrArea *sa= CTX_wm_area(C);
 	ARegion *ar= CTX_wm_region(C);
@@ -1441,7 +1526,7 @@ int ui_handler_panel_region(bContext *C, wmEvent *event)
 	return retval;
 }
 
-/* window level modal panel interaction */
+/**************** window level modal panel interaction **************/
 
 static int ui_handler_panel(bContext *C, wmEvent *event, void *userdata)
 {
@@ -1489,7 +1574,7 @@ static void ui_handler_remove_panel(bContext *C, void *userdata)
 	panel_activate_state(C, pa, PANEL_STATE_EXIT);
 }
 
-static void panel_activate_state(bContext *C, Panel *pa, uiHandlePanelState state)
+static void panel_activate_state(const bContext *C, Panel *pa, uiHandlePanelState state)
 {
 	uiHandlePanelData *data= pa->activedata;
 	wmWindow *win= CTX_wm_window(C);

source/blender/editors/interface/interface_utils.c

@@ -297,7 +297,7 @@ int uiDefAutoButsRNA(const bContext *C, uiBlock *block, PointerRNA *ptr)
 	char *name;
 	int x= 0, y= 0;
 
-	layout= uiLayoutBegin(UI_LAYOUT_VERTICAL, x, y, DEF_BUT_WIDTH*2, 0);
+	layout= uiLayoutBegin(UI_LAYOUT_VERTICAL, x, y, DEF_BUT_WIDTH*2, 20);
 
 	uiLayoutColumn(layout);
 	uiItemL(layout, (char*)RNA_struct_ui_name(ptr), 0);
@@ -314,7 +314,9 @@ int uiDefAutoButsRNA(const bContext *C, uiBlock *block, PointerRNA *ptr)
 		uiLayoutSplit(layout, 2, 0);
 
 		name= (char*)RNA_property_ui_name(ptr, prop);
+		uiLayoutColumn(uiLayoutSub(layout, 0));
 		uiItemL(uiLayoutSub(layout, 0), name, 0);
+		uiLayoutColumn(uiLayoutSub(layout, 1));
 		uiItemFullR(uiLayoutSub(layout, 1), "", 0, ptr, prop, -1, 0);
 	}
 

source/blender/editors/space_buttons/space_buttons.c

@@ -70,6 +70,7 @@ static SpaceLink *buttons_new(const bContext *C)
 	sbuts= MEM_callocN(sizeof(SpaceButs), "initbuts");
 	sbuts->spacetype= SPACE_BUTS;
 	sbuts->scaflag= BUTS_SENS_LINK|BUTS_SENS_ACT|BUTS_CONT_ACT|BUTS_ACT_ACT|BUTS_ACT_LINK;
+	sbuts->align= BUT_AUTO;
 
 	/* header */
 	ar= MEM_callocN(sizeof(ARegion), "header for buts");
@@ -128,7 +129,15 @@ static void buttons_free(SpaceLink *sl)
 /* spacetype; init callback */
 static void buttons_init(struct wmWindowManager *wm, ScrArea *sa)
 {
+	SpaceButs *sbuts= sa->spacedata.first;
 
+	/* auto-align based on size */
+	if(sbuts->align == BUT_AUTO) {
+		if(sa->winx > sa->winy)
+			sbuts->align= BUT_HORIZONTAL;
+		else
+			sbuts->align= BUT_VERTICAL;
+	}
 }
 
 static SpaceLink *buttons_duplicate(SpaceLink *sl)
@@ -158,18 +167,14 @@ static void buttons_main_area_draw(const bContext *C, ARegion *ar)
 {
 	/* draw entirely, view changes should be handled here */
 	SpaceButs *sbuts= (SpaceButs*)CTX_wm_space_data(C);
+	int vertical= (sbuts->align == BUT_VERTICAL);
+	int tab= sbuts->tab[sbuts->mainb];
 
 	if(sbuts->mainb == CONTEXT_OBJECT) {
-		int tab= sbuts->tab[CONTEXT_OBJECT];
-		int vertical= (sbuts->align == 2);
-
 		if(tab == TAB_OBJECT_OBJECT)
 			uiRegionPanelLayout(C, ar, vertical, "object");
 	}
 	else if (sbuts->mainb == CONTEXT_SCENE){
-		int tab= sbuts->tab[CONTEXT_SCENE];
-		int vertical= (sbuts->align == 2);
-
 		if(tab == TAB_SCENE_RENDER)
 			uiRegionPanelLayout(C, ar, vertical, "render");
 	}	

source/blender/makesdna/DNA_screen_types.h

@@ -96,7 +96,7 @@ typedef struct Panel {		/* the part from uiBlock that needs saved in file */
 	char panelname[64], tabname[64];	/* defined as UI_MAX_NAME_STR */
 	char drawname[64];					/* panelname is identifier for restoring location */
 	short ofsx, ofsy, sizex, sizey;
-	short flag, active;					/* active= used currently by a uiBlock */
+	short flag, runtime_flag;
 	short control;
 	short snap;
 	int sortcounter, pad;		/* when sorting panels, it uses this to put new ones in right place */

source/blender/makesdna/DNA_space_types.h

@@ -467,8 +467,10 @@ typedef struct SpaceImaSel {
 #define SB_PRV_OSA			1
 
 /* sbuts->align */
+#define BUT_FREE  		0
 #define BUT_HORIZONTAL  1
 #define BUT_VERTICAL    2
+#define BUT_AUTO		3
 
 /* sbuts->scaflag */		
 #define BUTS_SENS_SEL		1

source/blender/python/intern/bpy_panel_wrap.c

@@ -36,6 +36,8 @@
 #include "DNA_screen_types.h"
 #include "MEM_guardedalloc.h"
 #include "ED_screen.h"
+#include "WM_api.h"
+#include "WM_types.h"
 
 #define PYPANEL_ATTR_UINAME		"__label__"
 #define PYPANEL_ATTR_IDNAME		"__name__"	/* use pythons class name */
@@ -125,11 +127,13 @@ static int PyPanel_poll(const bContext *C)
 /* pyOperators - Operators defined IN Python */
 PyObject *PyPanel_wrap_add(PyObject *self, PyObject *args)
 {
+	bContext *C;
 	PyObject *item;
 	PyObject *py_class;
 	PyObject *base_class;
 	char *space_identifier;
 	char *region_identifier;
+	char *idname;
 	int space_value;
 	int region_value;
 
@@ -204,27 +208,39 @@ PyObject *PyPanel_wrap_add(PyObject *self, PyObject *args)
 		return NULL;
 	}
 
-	pt= MEM_callocN(sizeof(PanelType), "python buttons panel");
-	pt->idname= _PyUnicode_AsString(pypnl_class_attrs[PYPANEL_ATTR_IDNAME_IDX]);
+	idname= _PyUnicode_AsString(pypnl_class_attrs[PYPANEL_ATTR_IDNAME_IDX]);
+
+	for(pt=art->paneltypes.first; pt; pt=pt->next)
+		if(strcmp(pt->idname, idname) == 0)
+			break;
+
+	if(!pt) {
+		pt= MEM_callocN(sizeof(PanelType), "python buttons panel");
+		pt->srna= RNA_def_struct(&BLENDER_RNA, pt->idname, "Panel"); 
+		BLI_addtail(&art->paneltypes, pt);
+	}
+
+	pt->idname= idname;
 
 	item= pypnl_class_attrs[PYPANEL_ATTR_UINAME_IDX];
-	pt->name= item ? _PyUnicode_AsString(item):pt->idname;
-
+	pt->name= item? _PyUnicode_AsString(item): pt->idname;
 	pt->context= _PyUnicode_AsString(pypnl_class_attrs[PYPANEL_ATTR_CONTEXT_IDX]);
 
 	if (pypnl_class_attrs[PYPANEL_ATTR_POLL_IDX])
 		pt->poll= PyPanel_poll;
+	else
+		pt->poll= NULL;
 	
 	pt->draw= PyPanel_draw;
 
 	Py_INCREF(py_class);
 	pt->py_data= (void *)py_class;
-
-	BLI_addtail(&art->paneltypes, pt);
-
-	pt->srna= RNA_def_struct(&BLENDER_RNA, pt->idname, "Panel"); 
 	RNA_struct_py_type_set(pt->srna, py_class);
 
+	C= (bContext *)PyCObject_AsVoidPtr(PyDict_GetItemString(PyEval_GetGlobals(), "__bpy_context__"));
+	if(C)
+		WM_event_add_notifier(C, NC_SCREEN|NA_EDITED, NULL);
+
 	Py_RETURN_NONE;
 }
 

source/blender/windowmanager/WM_api.h

@@ -92,7 +92,7 @@ struct wmEventHandler *WM_event_add_keymap_handler_priority(ListBase *handlers,
 
 void		WM_event_remove_keymap_handler(ListBase *handlers, ListBase *keymap);
 
-struct wmEventHandler *WM_event_add_ui_handler(struct bContext *C, ListBase *handlers,
+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,

source/blender/windowmanager/intern/wm_event_system.c

@@ -1196,7 +1196,7 @@ void WM_event_remove_keymap_handler(ListBase *handlers, ListBase *keymap)
 	}
 }
 
-wmEventHandler *WM_event_add_ui_handler(bContext *C, ListBase *handlers, wmUIHandlerFunc func, wmUIHandlerRemoveFunc remove, void *userdata)
+wmEventHandler *WM_event_add_ui_handler(const bContext *C, ListBase *handlers, wmUIHandlerFunc func, wmUIHandlerRemoveFunc remove, void *userdata)
 {
 	wmEventHandler *handler= MEM_callocN(sizeof(wmEventHandler), "event ui handler");
 	handler->ui_handle= func;