UI

* Added option for panel to be closed by default.
* Added support for RNA property and enum icons in buttons.
* Remove some deprecated RNA menu code.
* Fix issue with newly created panels not being inserted in the
  right place.
* Fix issue with 3-split layout not being divided correctly.
* FIx issue with menu items not drawing correct using python UI.

10 files changed, 121 insertions, 104 deletions

diff --git a/source/blender/blenkernel/BKE_screen.h b/source/blender/blenkernel/BKE_screen.h
index 9b5d99f6ae6..750f4fba7e6 100644
--- a/source/blender/blenkernel/BKE_screen.h
+++ b/source/blender/blenkernel/BKE_screen.h
@@ -157,6 +157,8 @@ typedef struct PanelType {
 	int			space_type;
 	int			region_type;
 
+	int 		flag;
+
 	/* verify if the panel should draw or not */
 	int			(*poll)(const struct bContext *, struct PanelType *);
 	/* draw header (optional) */
diff --git a/source/blender/editors/include/UI_interface.h b/source/blender/editors/include/UI_interface.h
index eb3a037d7b1..62469686e7f 100644
--- a/source/blender/editors/include/UI_interface.h
+++ b/source/blender/editors/include/UI_interface.h
@@ -491,7 +491,7 @@ void autocomplete_end(AutoComplete *autocpl, char *autoname);
 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, int *open);
+struct Panel *uiBeginPanel(struct ScrArea *sa, struct ARegion *ar, uiBlock *block, struct PanelType *pt, int *open);
 void uiEndPanel(uiBlock *block, int width, int height);
 
 /* Handlers
@@ -539,8 +539,6 @@ void UI_exit(void);
 
 uiBut *uiDefMenuButO(uiBlock *block, char *opname, char *name);
 uiBut *uiDefMenuSep(uiBlock *block);
-uiBut *uiDefMenuSub(uiBlock *block, uiBlockCreateFunc func, char *name);
-uiBut *uiDefMenuTogR(uiBlock *block, struct PointerRNA *ptr, char *propname, char *propvalue, char *name);
 
 /* Layout
  *
diff --git a/source/blender/editors/interface/interface.c b/source/blender/editors/interface/interface.c
index b3f24be2f9a..99c520db7b8 100644
--- a/source/blender/editors/interface/interface.c
+++ b/source/blender/editors/interface/interface.c
@@ -1859,18 +1859,24 @@ void ui_check_but(uiBut *but)
 			
 		case ICONTOG: 
 		case ICONTOGN:
-			if(but->flag & UI_SELECT) but->iconadd= 1;
-			else but->iconadd= 0;
+			if(!but->rnaprop || (RNA_property_flag(but->rnaprop) & PROP_ICONS_CONSECUTIVE)) {
+				if(but->flag & UI_SELECT) but->iconadd= 1;
+				else but->iconadd= 0;
+			}
 			break;
 			
 		case ICONROW:
-			value= ui_get_but_val(but);
-			but->iconadd= (int)value- (int)(but->hardmin);
+			if(!but->rnaprop || (RNA_property_flag(but->rnaprop) & PROP_ICONS_CONSECUTIVE)) {
+				value= ui_get_but_val(but);
+				but->iconadd= (int)value- (int)(but->hardmin);
+			}
 			break;
 			
 		case ICONTEXTROW:
-			value= ui_get_but_val(but);
-			but->iconadd= (int)value- (int)(but->hardmin);
+			if(!but->rnaprop || (RNA_property_flag(but->rnaprop) & PROP_ICONS_CONSECUTIVE)) {
+				value= ui_get_but_val(but);
+				but->iconadd= (int)value- (int)(but->hardmin);
+			}
 			break;
 	}
 	
@@ -2267,7 +2273,7 @@ uiBut *ui_def_but_rna(uiBlock *block, int type, int retval, char *str, short x1,
 	uiBut *but;
 	PropertyRNA *prop;
 	PropertyType proptype;
-	int freestr= 0;
+	int freestr= 0, icon= 0;
 
 	prop= RNA_struct_find_property(ptr, propname);
 
@@ -2279,14 +2285,22 @@ uiBut *ui_def_but_rna(uiBlock *block, int type, int retval, char *str, short x1,
 			if(type == MENU && proptype == PROP_ENUM) {
 				const EnumPropertyItem *item;
 				DynStr *dynstr;
-				int i, totitem;
+				int i, totitem, value;
 
 				RNA_property_enum_items(ptr, prop, &item, &totitem);
+				value= RNA_property_enum_get(ptr, prop);
 
 				dynstr= BLI_dynstr_new();
 				BLI_dynstr_appendf(dynstr, "%s%%t", RNA_property_ui_name(prop));
-				for(i=0; i<totitem; i++)
-					BLI_dynstr_appendf(dynstr, "|%s %%x%d", item[i].name, item[i].value);
+				for(i=0; i<totitem; i++) {
+					if(item[i].icon)
+						BLI_dynstr_appendf(dynstr, "|%s %%i%d %%x%d", item[i].name, item[i].icon, item[i].value);
+					else
+						BLI_dynstr_appendf(dynstr, "|%s %%x%d", item[i].name, item[i].value);
+
+					if(value == item[i].value)
+						icon= item[i].icon;
+				}
 				str= BLI_dynstr_get_cstring(dynstr);
 				BLI_dynstr_free(dynstr);
 
@@ -2297,15 +2311,20 @@ uiBut *ui_def_but_rna(uiBlock *block, int type, int retval, char *str, short x1,
 				int i, totitem;
 
 				RNA_property_enum_items(ptr, prop, &item, &totitem);
-				for(i=0; i<totitem; i++)
-					if(item[i].value == (int)max)
+				for(i=0; i<totitem; i++) {
+					if(item[i].value == (int)max) {
 						str= (char*)item[i].name;
+						icon= item[i].icon;
+					}
+				}
 
 				if(!str)
 					str= (char*)RNA_property_ui_name(prop);
 			}
-			else
+			else {
 				str= (char*)RNA_property_ui_name(prop);
+				icon= RNA_property_ui_icon(prop);
+			}
 		}
 
 		if(!tip) {
@@ -2384,6 +2403,13 @@ uiBut *ui_def_but_rna(uiBlock *block, int type, int retval, char *str, short x1,
 
 		if(type == IDPOIN)
 			uiButSetCompleteFunc(but, ui_rna_ID_autocomplete, but);
+
+	}
+
+	if(icon) {
+		but->icon= (BIFIconID)icon;
+		but->flag |= UI_HAS_ICON;
+		but->flag|= UI_ICON_LEFT;
 	}
 	
 	if (!prop || !RNA_property_editable(&but->rnapoin, prop)) {
@@ -2653,8 +2679,10 @@ uiBut *uiDefIconButR(uiBlock *block, int type, int retval, int icon, short x1, s
 
 	but= ui_def_but_rna(block, type, retval, "", x1, y1, x2, y2, ptr, propname, index, min, max, a1, a2, tip);
 	if(but) {
-		but->icon= (BIFIconID) icon;
-		but->flag|= UI_HAS_ICON;
+		if(icon) {
+			but->icon= (BIFIconID) icon;
+			but->flag|= UI_HAS_ICON;
+		}
 		ui_check_but(but);
 	}
 
@@ -2736,8 +2764,10 @@ uiBut *uiDefIconTextButR(uiBlock *block, int type, int retval, int icon, char *s
 
 	but= ui_def_but_rna(block, type, retval, str, x1, y1, x2, y2, ptr, propname, index, min, max, a1, a2, tip);
 	if(but) {
-		but->icon= (BIFIconID) icon;
-		but->flag|= UI_HAS_ICON;
+		if(icon) {
+			but->icon= (BIFIconID) icon;
+			but->flag|= UI_HAS_ICON;
+		}
 		but->flag|= UI_ICON_LEFT;
 		ui_check_but(but);
 	}
@@ -2779,60 +2809,6 @@ uiBut *uiDefMenuSep(uiBlock *block)
 	return uiDefBut(block, SEPR, 0, "", 0, y, MENU_WIDTH, MENU_SEP_HEIGHT, NULL, 0.0, 0.0, 0, 0, "");
 }
 
-uiBut *uiDefMenuSub(uiBlock *block, uiBlockCreateFunc func, char *name)
-{
-	int y= ui_menu_y(block) - MENU_ITEM_HEIGHT;
-	return uiDefIconTextBlockBut(block, func, NULL, ICON_BLANK1, name, 0, y, MENU_WIDTH, MENU_ITEM_HEIGHT-1, "");
-}
-
-uiBut *uiDefMenuTogR(uiBlock *block, PointerRNA *ptr, char *propname, char *propvalue, char *name)
-{
-	uiBut *but;
-	PropertyRNA *prop;
-	PropertyType type;
-	const EnumPropertyItem *item;
-	int a, value, totitem, icon= ICON_CHECKBOX_DEHLT;
-	int y= ui_menu_y(block) - MENU_ITEM_HEIGHT;
-
-	prop= RNA_struct_find_property(ptr, propname);
-	if(prop) {
-		type= RNA_property_type(prop);
-
-		if(type == PROP_BOOLEAN) {
-			if(RNA_property_boolean_get(ptr, prop))
-				icon= ICON_CHECKBOX_HLT;
-
-			return uiDefIconTextButR(block, TOG, 0, icon, name, 0, y, MENU_WIDTH, MENU_ITEM_HEIGHT-1, ptr, propname, 0, 0, 0, 0, 0, NULL);
-		}
-		else if(type == PROP_ENUM) {
-			RNA_property_enum_items(ptr, prop, &item, &totitem);
-
-			value= 0;
-			for(a=0; a<totitem; a++) {
-				if(propvalue && strcmp(propvalue, item[a].identifier) == 0) {
-					value= item[a].value;
-					if(!name)
-						name= (char*)item[a].name;
-
-					if(RNA_property_enum_get(ptr, prop) == value)
-						icon= ICON_CHECKBOX_HLT;
-					break;
-				}
-			}
-
-			if(a != totitem)
-				return uiDefIconTextButR(block, ROW, 0, icon, name, 0, y, MENU_WIDTH, MENU_ITEM_HEIGHT-1, ptr, propname, 0, 0, value, 0, 0, NULL);
-		}
-	}
-
-	/* not found */
-	uiBlockSetButLock(block, 1, "");
-	but= uiDefIconTextBut(block, BUT, 0, ICON_BLANK1, propname, 0, y, MENU_WIDTH, MENU_ITEM_HEIGHT, NULL, 0.0, 0.0, 0, 0, "");
-	uiBlockClearButLock(block);
-
-	return but;
-} 
-
 /* END Button containing both string label and icon */
 
 void uiSetButLink(uiBut *but, void **poin, void ***ppoin, short *tot, int from, int to)
diff --git a/source/blender/editors/interface/interface_layout.c b/source/blender/editors/interface/interface_layout.c
index 723e48e5970..81c49105870 100644
--- a/source/blender/editors/interface/interface_layout.c
+++ b/source/blender/editors/interface/interface_layout.c
@@ -427,19 +427,29 @@ static void ui_item_array(uiLayout *layout, uiBlock *block, char *name, int icon
 	uiBlockSetCurLayout(block, layout);
 }
 
-static void ui_item_enum_row(uiLayout *layout, uiBlock *block, PointerRNA *ptr, PropertyRNA *prop, int x, int y, int w, int h)
+static void ui_item_enum_row(uiLayout *layout, uiBlock *block, PointerRNA *ptr, PropertyRNA *prop, char *uiname, int x, int y, int w, int h)
 {
 	const EnumPropertyItem *item;
-	int a, totitem, itemw;
-	const char *propname;
+	const char *identifier;
+	char *name;
+	int a, totitem, itemw, icon, value;
 
-	propname= RNA_property_identifier(prop);
+	identifier= RNA_property_identifier(prop);
 	RNA_property_enum_items(ptr, prop, &item, &totitem);
 
 	uiBlockSetCurLayout(block, ui_item_local_sublayout(layout, layout, 1));
 	for(a=0; a<totitem; a++) {
-		itemw= ui_text_icon_width(block->curlayout, (char*)item[a].name, 0);
-		uiDefButR(block, ROW, 0, NULL, 0, 0, itemw, h, ptr, propname, -1, 0, item[a].value, -1, -1, NULL);
+		name= (!uiname || uiname[0])? (char*)item[a].name: "";
+		icon= item[a].icon;
+		value= item[a].value;
+		itemw= ui_text_icon_width(block->curlayout, name, icon);
+
+		if(icon && strcmp(name, "") != 0)
+			uiDefIconTextButR(block, ROW, 0, icon, name, 0, 0, itemw, h, ptr, identifier, -1, 0, value, -1, -1, NULL);
+		else if(icon)
+			uiDefIconButR(block, ROW, 0, icon, 0, 0, itemw, h, ptr, identifier, -1, 0, value, -1, -1, NULL);
+		else
+			uiDefButR(block, ROW, 0, name, 0, 0, itemw, h, ptr, identifier, -1, 0, value, -1, -1, NULL);
 	}
 	uiBlockSetCurLayout(block, layout);
 }
@@ -732,6 +742,8 @@ void uiItemFullR(uiLayout *layout, char *name, int icon, PointerRNA *ptr, Proper
 	/* set name and icon */
 	if(!name)
 		name= (char*)RNA_property_ui_name(prop);
+	if(!icon)
+		icon= RNA_property_ui_icon(prop);
 
 	if(ELEM5(type, PROP_INT, PROP_FLOAT, PROP_STRING, PROP_ENUM, PROP_POINTER))
 		name= ui_item_name_add_colon(name, namestr);
@@ -764,7 +776,7 @@ void uiItemFullR(uiLayout *layout, char *name, int icon, PointerRNA *ptr, Proper
 	}
 	/* expanded enum */
 	else if(type == PROP_ENUM && expand)
-		ui_item_enum_row(layout, block, ptr, prop, 0, 0, w, h);
+		ui_item_enum_row(layout, block, ptr, prop, name, 0, 0, w, h);
 	/* property with separate label */
 	else if(type == PROP_ENUM || type == PROP_STRING || type == PROP_POINTER)
 		ui_item_with_label(layout, block, name, icon, ptr, prop, index, 0, 0, w, h);
@@ -858,7 +870,7 @@ static void ui_item_menu(uiLayout *layout, char *name, int icon, uiMenuCreateFun
 	uiBlockSetCurLayout(block, layout);
 
 	if(layout->root->type == UI_LAYOUT_HEADER)
-		uiBlockSetEmboss(block, UI_EMBOSSP);
+		uiBlockSetEmboss(block, UI_EMBOSS);
 
 	if(!name)
 		name= "";
@@ -869,7 +881,7 @@ static void ui_item_menu(uiLayout *layout, char *name, int icon, uiMenuCreateFun
 	h= UI_UNIT_Y;
 
 	if(layout->root->type == UI_LAYOUT_HEADER) /* ugly .. */
-		w -= 3;
+		w -= 10;
 
 	if(icon)
 		but= uiDefIconTextMenuBut(block, func, arg, icon, (char*)name, 0, 0, w, h, "");
@@ -1484,6 +1496,7 @@ static void ui_litem_layout_split(uiLayout *litem)
 {
 	uiLayoutItemSplt *split= (uiLayoutItemSplt*)litem;
 	uiItem *item;
+	float percentage;
 	int itemh, x, y, w, tot=0, colw=0;
 
 	x= litem->x;
@@ -1495,8 +1508,10 @@ static void ui_litem_layout_split(uiLayout *litem)
 	if(tot == 0)
 		return;
 	
+	percentage= (split->percentage == 0.0f)? 1.0f/(float)tot: split->percentage;
+	
 	w= (litem->w - (tot-1)*litem->space);
-	colw= w*split->percentage;
+	colw= w*percentage;
 	colw= MAX2(colw, 0);
 
 	for(item=litem->items.first; item; item=item->next) {
@@ -1506,7 +1521,7 @@ static void ui_litem_layout_split(uiLayout *litem)
 		x += colw;
 
 		if(item->next) {
-			colw= (w - (w*split->percentage))/(tot-1);
+			colw= (w - (int)(w*percentage))/(tot-1);
 			colw= MAX2(colw, 0);
 
 			x += litem->space;
@@ -1637,7 +1652,7 @@ uiLayout *uiLayoutSplit(uiLayout *layout, float percentage)
 	split->litem.enabled= 1;
 	split->litem.context= layout->context;
 	split->litem.space= layout->root->style->columnspace;
-	split->percentage= (percentage == 0.0f)? 0.5f: percentage;
+	split->percentage= percentage;
 	BLI_addtail(&layout->items, split);
 
 	uiBlockSetCurLayout(layout->root->block, &split->litem);
diff --git a/source/blender/editors/interface/interface_panel.c b/source/blender/editors/interface/interface_panel.c
index 278f7c026b1..06582762fdb 100644
--- a/source/blender/editors/interface/interface_panel.c
+++ b/source/blender/editors/interface/interface_panel.c
@@ -69,6 +69,7 @@
 #define PNL_ACTIVE			2
 #define PNL_WAS_ACTIVE		4
 #define PNL_ANIM_ALIGN		8
+#define PNL_NEW_ADDED		16
 
 typedef enum uiHandlePanelState {
 	PANEL_STATE_DRAG,
@@ -157,18 +158,20 @@ static void ui_panel_copy_offset(Panel *pa, Panel *papar)
 	pa->ofsy= papar->ofsy + papar->sizey-pa->sizey;
 }
 
-Panel *uiBeginPanel(ARegion *ar, uiBlock *block, PanelType *pt, int *open)
+Panel *uiBeginPanel(ScrArea *sa, ARegion *ar, uiBlock *block, PanelType *pt, int *open)
 {
 	uiStyle *style= U.uistyles.first;
 	Panel *pa, *patab, *palast, *panext;
-	char *panelname= pt->label;
-	char *tabname= pt->label;
+	char *drawname= pt->label;
+	char *idname= pt->idname;
+	char *tabname= pt->idname;
 	char *hookname= NULL;
 	int newpanel;
+	int align= panel_aligned(sa, ar);
 	
 	/* 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->panelname, idname, UI_MAX_NAME_STR)==0)
 			if(strncmp(pa->tabname, tabname, UI_MAX_NAME_STR)==0)
 				break;
 	
@@ -181,13 +184,21 @@ Panel *uiBeginPanel(ARegion *ar, uiBlock *block, PanelType *pt, int *open)
 		/* new panel */
 		pa= MEM_callocN(sizeof(Panel), "new panel");
 		pa->type= pt;
-		BLI_strncpy(pa->panelname, panelname, UI_MAX_NAME_STR);
+		BLI_strncpy(pa->panelname, idname, UI_MAX_NAME_STR);
 		BLI_strncpy(pa->tabname, tabname, UI_MAX_NAME_STR);
+
+		if(pt->flag & PNL_DEFAULT_CLOSED) {
+			if(align == BUT_VERTICAL)
+				pa->flag |= PNL_CLOSEDY;
+			else
+				pa->flag |= PNL_CLOSEDX;
+		}
 	
 		pa->ofsx= 0;
 		pa->ofsy= style->panelouter;
 		pa->sizex= 0;
 		pa->sizey= 0;
+		pa->runtime_flag |= PNL_NEW_ADDED;
 
 		BLI_addtail(&ar->panels, pa);
 		
@@ -207,6 +218,8 @@ Panel *uiBeginPanel(ARegion *ar, uiBlock *block, PanelType *pt, int *open)
 		}
 	}
 
+	BLI_strncpy(pa->drawname, drawname, UI_MAX_NAME_STR);
+
 	/* if a new panel is added, we insert it right after the panel
 	 * that was last added. this way new panels are inserted in the
 	 * right place between versions */
@@ -235,7 +248,6 @@ Panel *uiBeginPanel(ARegion *ar, uiBlock *block, PanelType *pt, int *open)
 	if(pa->flag & PNL_CLOSED) return pa;
 
 	*open= 1;
-	pa->drawname[0]= 0; /* otherwise closes panels show wrong title */
 	
 	return pa;
 }
@@ -244,13 +256,20 @@ void uiEndPanel(uiBlock *block, int width, int height)
 {
 	Panel *pa= block->panel;
 
-	if(pa->sizex != width || pa->sizey != height) {
-		pa->runtime_flag |= PNL_ANIM_ALIGN;
-		pa->ofsy += pa->sizey-height;
+	if(pa->runtime_flag & PNL_NEW_ADDED) {
+		pa->runtime_flag &= ~PNL_NEW_ADDED;
+		pa->sizex= width;
+		pa->sizey= height;
 	}
+	else if(!(width == 0 || height == 0)) {
+		if(pa->sizex != width || pa->sizey != height) {
+			pa->runtime_flag |= PNL_ANIM_ALIGN;
+			pa->ofsy += pa->sizey-height;
+		}
 
-	pa->sizex= width;
-	pa->sizey= height;
+		pa->sizex= width;
+		pa->sizey= height;
+	}
 }
 
 #if 0
diff --git a/source/blender/editors/interface/interface_templates.c b/source/blender/editors/interface/interface_templates.c
index 63de328af0f..a0ee264cf01 100644
--- a/source/blender/editors/interface/interface_templates.c
+++ b/source/blender/editors/interface/interface_templates.c
@@ -1448,10 +1448,8 @@ void uiTemplateCurveMapping(uiLayout *layout, CurveMapping *cumap, int type)
 
 void uiTemplateLayers(uiLayout *layout, PointerRNA *ptr, char *propname)
 {
-	uiBlock *block;
 	uiLayout *uRow, *uSplit, *uCol;
 	PropertyRNA *prop;
-	StructRNA *type;
 	int groups, cols, layers;
 	int group, col, layer, row;
 	
diff --git a/source/blender/editors/interface/interface_widgets.c b/source/blender/editors/interface/interface_widgets.c
index ce416d2a3c5..52a77be0b01 100644
--- a/source/blender/editors/interface/interface_widgets.c
+++ b/source/blender/editors/interface/interface_widgets.c
@@ -874,9 +874,9 @@ static void widget_draw_text_icon(uiFontStyle *fstyle, uiWidgetColors *wcol, uiB
 		and offset the text label to accomodate it */
 		
 		if (but->flag & UI_HAS_ICON) {
-			widget_draw_icon(but, but->icon, 0, rect);
+			widget_draw_icon(but, but->icon+but->iconadd, 0, rect);
 			
-			rect->xmin += UI_icon_get_width(but->icon);
+			rect->xmin += UI_icon_get_width(but->icon+but->iconadd);
 			
 			if(but->editstr || (but->flag & UI_TEXT_LEFT)) 
 				rect->xmin += 5;
diff --git a/source/blender/editors/screen/area.c b/source/blender/editors/screen/area.c
index 81b63b694ba..c2521bd5b2c 100644
--- a/source/blender/editors/screen/area.c
+++ b/source/blender/editors/screen/area.c
@@ -1106,6 +1106,7 @@ int ED_area_header_standardbuttons(const bContext *C, uiBlock *block, int yco)
 
 void ED_region_panels(const bContext *C, ARegion *ar, int vertical, char *context)
 {
+	ScrArea *sa= CTX_wm_area(C);
 	uiStyle *style= U.uistyles.first;
 	uiBlock *block;
 	PanelType *pt;
@@ -1143,7 +1144,7 @@ void ED_region_panels(const bContext *C, ARegion *ar, int vertical, char *contex
 		/* draw panel */
 		if(pt->draw && (!pt->poll || pt->poll(C, pt))) {
 			block= uiBeginBlock(C, ar, pt->idname, UI_EMBOSS);
-			panel= uiBeginPanel(ar, block, pt, &open);
+			panel= uiBeginPanel(sa, ar, block, pt, &open);
 
 			if(vertical)
 				y -= header;
@@ -1161,7 +1162,6 @@ void ED_region_panels(const bContext *C, ARegion *ar, int vertical, char *contex
 			}
 
 			if(open) {
-				panel->type= pt;
 				panel->layout= uiBlockLayout(block, UI_LAYOUT_VERTICAL, UI_LAYOUT_PANEL,
 					style->panelspace, 0, w-2*style->panelspace, em, style);
 
@@ -1173,8 +1173,10 @@ void ED_region_panels(const bContext *C, ARegion *ar, int vertical, char *contex
 				yco -= 2*style->panelspace;
 				uiEndPanel(block, w, -yco);
 			}
-			else
+			else {
 				yco= 0;
+				uiEndPanel(block, w, 0);
+			}
 
 			uiEndBlock(C, block);
 
diff --git a/source/blender/makesdna/DNA_screen_types.h b/source/blender/makesdna/DNA_screen_types.h
index 418cc84205a..4891f44e1cd 100644
--- a/source/blender/makesdna/DNA_screen_types.h
+++ b/source/blender/makesdna/DNA_screen_types.h
@@ -205,6 +205,9 @@ typedef struct ARegion {
 
 #define PNL_SNAP_DIST		9.0
 
+/* paneltype flag */
+#define PNL_DEFAULT_CLOSED		1
+
 /* screen handlers */
 #define SCREEN_MAXHANDLER		8
 
diff --git a/source/blender/makesrna/intern/rna_ui.c b/source/blender/makesrna/intern/rna_ui.c
index c46dfe15d8b..825b3711b97 100644
--- a/source/blender/makesrna/intern/rna_ui.c
+++ b/source/blender/makesrna/intern/rna_ui.c
@@ -603,6 +603,10 @@ static void rna_def_panel(BlenderRNA *brna)
 	prop= RNA_def_property(srna, "context", PROP_STRING, PROP_NONE);
 	RNA_def_property_string_sdna(prop, NULL, "type->context");
 	RNA_def_property_flag(prop, PROP_REGISTER);
+
+	prop= RNA_def_property(srna, "default_closed", PROP_BOOLEAN, PROP_NONE);
+	RNA_def_property_boolean_sdna(prop, NULL, "type->flag", PNL_DEFAULT_CLOSED);
+	RNA_def_property_flag(prop, PROP_REGISTER);
 }
 
 static void rna_def_header(BlenderRNA *brna)