UI: New Global Top-Bar (WIP)

== Main Features/Changes for Users

* Add horizontal bar at top of all non-temp windows, consisting out of two horizontal sub-bars.
* Upper sub-bar contains global menus (File, Render, etc.), tabs for workspaces and scene selector.
* Lower sub-bar contains object mode selector, screen-layout and render-layer selector. Later operator and/or tool settings will be placed here.
* Individual sections of the topbar are individually scrollable.
* Workspace tabs can be double- or ctrl-clicked for renaming and contain 'x' icon for deleting.
* Top-bar should scale nicely with DPI.
* The lower half of the top-bar can be hided by dragging the lower top-bar edge up. Better hiding options are planned (e.g. hide in fullscreen modes).
* Info editors at the top of the window and using the full window width with be replaced by the top-bar.
* In fullscreen modes, no more info editor is added on top, the top-bar replaces it.

== Technical Features/Changes

* Adds initial support for global areas

  A global area is part of the window, not part of the regular screen-layout.
  I've added a macro iterator to iterate over both, global and screen-layout level areas. When iterating over areas, from now on developers should always consider if they have to include global areas.
* Adds a TOPBAR editor type

  The editor type is hidden in the UI editor type menu.
* Adds a variation of the ID template to display IDs as tab buttons (template_ID_tabs in BPY)
* Does various changes to RNA button creation code to improve their appearance in the horizontal top-bar.
* Adds support for dynamically sized regions. That is, regions that scale automatically to the layout bounds.

  The code for this is currently a big hack (it's based on drawing the UI multiple times). This should definitely be improved.
* Adds a template for displaying operator properties optimized for the top-bar. This will probably change a lot still and is in fact disabled in code.

Since the final top-bar design depends a lot on other 2.8 designs (mainly tool-system and workspaces), we decided to not show the operator or tool settings in the top-bar for now. That means most of the lower sub-bar is empty for the time being.

NOTE: Top-bar or global area data is not written to files or SDNA. They are simply added to the window when opening Blender or reading a file. This allows us doing changes to the top-bar without having to care for compatibility.

== ToDo's

It's a bit hard to predict all the ToDo's here are the known main ones:
* Add options for the new active-tool system and for operator redo to the topbar.
* Automatically hide the top-bar in fullscreen modes.
* General visual polish.
* Top-bar drag & drop support (WIP in temp-tab_drag_drop).
* Improve dynamic regions (should also fix some layout glitches).
* Make internal terminology consistent.
* Enable topbar file writing once design is more advanced.
* Address TODO's and XXX's in code :)

Thanks @brecht for the review! And @sergey for the complaining ;)

Differential Revision: D2758

1 files changed, 65 insertions, 30 deletions

diff --git a/source/blender/editors/interface/interface_layout.c b/source/blender/editors/interface/interface_layout.c
index 969367f485c..7193ad64359 100644
--- a/source/blender/editors/interface/interface_layout.c
+++ b/source/blender/editors/interface/interface_layout.c
@@ -392,7 +392,7 @@ static void ui_layer_but_cb(bContext *C, void *arg_but, void *arg_index)
 static void ui_item_array(
         uiLayout *layout, uiBlock *block, const char *name, int icon,
         PointerRNA *ptr, PropertyRNA *prop, int len, int x, int y, int w, int UNUSED(h),
-        bool expand, bool slider, bool toggle, bool icon_only)
+        bool expand, bool slider, bool toggle, bool icon_only, bool compact)
 {
 	uiStyle *style = layout->root->style;
 	uiBut *but;
@@ -541,9 +541,18 @@ static void ui_item_array(
 			}
 
 			for (a = 0; a < len; a++) {
-				if (!icon_only) str[0] = RNA_property_array_item_char(prop, a);
-				if (boolarr) icon = boolarr[a] ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT;
-				but = uiDefAutoButR(block, ptr, prop, a, str, icon, 0, 0, w, UI_UNIT_Y);
+				int width_item;
+
+				if (!icon_only) {
+					str[0] = RNA_property_array_item_char(prop, a);
+				}
+				if (boolarr) {
+					icon = boolarr[a] ? ICON_CHECKBOX_HLT : ICON_CHECKBOX_DEHLT;
+				}
+				width_item = (compact && type == PROP_BOOLEAN) ?
+				                 min_ii(w, ui_text_icon_width(layout, str, icon, false)) : w;
+
+				but = uiDefAutoButR(block, ptr, prop, a, str, icon, 0, 0, width_item, UI_UNIT_Y);
 				if (slider && but->type == UI_BTYPE_NUM)
 					but->type = UI_BTYPE_NUM_SLIDER;
 				if (toggle && but->type == UI_BTYPE_CHECKBOX)
@@ -669,27 +678,38 @@ static void ui_keymap_but_cb(bContext *UNUSED(C), void *but_v, void *UNUSED(key_
 	RNA_boolean_set(&but->rnapoin, "oskey", (but->modifier_key & KM_OSKEY) != 0);
 }
 
-/* create label + button for RNA property */
-static uiBut *ui_item_with_label(uiLayout *layout, uiBlock *block, const char *name, int icon, PointerRNA *ptr, PropertyRNA *prop, int index, int x, int y, int w, int h, int flag)
+/**
+ * Create label + button for RNA property
+ *
+ * \param w_hint: For varying width layout, this becomes the label width.
+ *                Otherwise it's used to fit both items into it.
+ **/
+static uiBut *ui_item_with_label(
+        uiLayout *layout, uiBlock *block, const char *name, int icon,
+        PointerRNA *ptr, PropertyRNA *prop, int index,
+        int x, int y, int w_hint, int h, int flag)
 {
 	uiLayout *sub;
 	uiBut *but = NULL;
 	PropertyType type;
 	PropertySubType subtype;
-	int labelw;
+	int prop_but_width = w_hint;
 
 	sub = uiLayoutRow(layout, layout->align);
 	UI_block_layout_set_current(block, sub);
 
 	if (name[0]) {
-		/* XXX UI_fontstyle_string_width is not accurate */
-#if 0
-		labelw = UI_fontstyle_string_width(fstyle, name);
-		CLAMP(labelw, w / 4, 3 * w / 4);
-#endif
-		labelw = w / 3;
-		uiDefBut(block, UI_BTYPE_LABEL, 0, name, x, y, labelw, h, NULL, 0.0, 0.0, 0, 0, "");
-		w = w - labelw;
+		int w_label;
+
+		if (ui_layout_vary_direction(layout) == UI_ITEM_VARY_X) {
+			/* w_hint is width for label in this case. Use a default width for property button(s) */
+			prop_but_width = UI_UNIT_X * 5;
+			w_label = w_hint;
+		}
+		else {
+			w_label = w_hint / 3;
+		}
+		uiDefBut(block, UI_BTYPE_LABEL, 0, name, x, y, w_label, h, NULL, 0.0, 0.0, 0, 0, "");
 	}
 
 	type = RNA_property_type(prop);
@@ -697,14 +717,14 @@ static uiBut *ui_item_with_label(uiLayout *layout, uiBlock *block, const char *n
 
 	if (subtype == PROP_FILEPATH || subtype == PROP_DIRPATH) {
 		UI_block_layout_set_current(block, uiLayoutRow(sub, true));
-		but = uiDefAutoButR(block, ptr, prop, index, "", icon, x, y, w - UI_UNIT_X, h);
+		but = uiDefAutoButR(block, ptr, prop, index, "", icon, x, y, prop_but_width - UI_UNIT_X, h);
 
 		/* BUTTONS_OT_file_browse calls UI_context_active_but_prop_get_filebrowser */
 		uiDefIconButO(block, UI_BTYPE_BUT, subtype == PROP_DIRPATH ? "BUTTONS_OT_directory_browse" : "BUTTONS_OT_file_browse",
 		              WM_OP_INVOKE_DEFAULT, ICON_FILESEL, x, y, UI_UNIT_X, h, NULL);
 	}
 	else if (flag & UI_ITEM_R_EVENT) {
-		but = uiDefButR_prop(block, UI_BTYPE_KEY_EVENT, 0, name, x, y, w, h, ptr, prop, index, 0, 0, -1, -1, NULL);
+		but = uiDefButR_prop(block, UI_BTYPE_KEY_EVENT, 0, name, x, y, prop_but_width, h, ptr, prop, index, 0, 0, -1, -1, NULL);
 	}
 	else if (flag & UI_ITEM_R_FULL_EVENT) {
 		if (RNA_struct_is_a(ptr->type, &RNA_KeyMapItem)) {
@@ -712,14 +732,17 @@ static uiBut *ui_item_with_label(uiLayout *layout, uiBlock *block, const char *n
 
 			WM_keymap_item_to_string(ptr->data, false, buf, sizeof(buf));
 
-			but = uiDefButR_prop(block, UI_BTYPE_HOTKEY_EVENT, 0, buf, x, y, w, h, ptr, prop, 0, 0, 0, -1, -1, NULL);
+			but = uiDefButR_prop(block, UI_BTYPE_HOTKEY_EVENT, 0, buf, x, y, prop_but_width, h, ptr, prop, 0, 0, 0, -1, -1, NULL);
 			UI_but_func_set(but, ui_keymap_but_cb, but, NULL);
 			if (flag & UI_ITEM_R_IMMEDIATE)
 				UI_but_flag_enable(but, UI_BUT_IMMEDIATE);
 		}
 	}
-	else
-		but = uiDefAutoButR(block, ptr, prop, index, (type == PROP_ENUM && !(flag & UI_ITEM_R_ICON_ONLY)) ? NULL : "", icon, x, y, w, h);
+	else {
+		const char *str = (type == PROP_ENUM && !(flag & UI_ITEM_R_ICON_ONLY)) ? NULL : "";
+		but = uiDefAutoButR(block, ptr, prop, index, str, icon,
+		                    x, y, prop_but_width, h);
+	}
 
 	UI_block_layout_set_current(block, layout);
 	return but;
@@ -1302,8 +1325,10 @@ void uiItemO(uiLayout *layout, const char *name, int icon, const char *opname)
 /* RNA property items */
 
 static void ui_item_rna_size(
-        uiLayout *layout, const char *name, int icon, PointerRNA *ptr, PropertyRNA *prop,
-        int index, bool icon_only, int *r_w, int *r_h)
+        uiLayout *layout, const char *name, int icon,
+        PointerRNA *ptr, PropertyRNA *prop,
+        int index, bool icon_only, bool compact,
+        int *r_w, int *r_h)
 {
 	PropertyType type;
 	PropertySubType subtype;
@@ -1329,7 +1354,7 @@ static void ui_item_rna_size(
 			RNA_property_enum_items_gettexted(layout->root->block->evil_C, ptr, prop, &item_array, NULL, &free);
 			for (item = item_array; item->identifier; item++) {
 				if (item->identifier[0]) {
-					w = max_ii(w, ui_text_icon_width(layout, item->name, item->icon, 0));
+					w = max_ii(w, ui_text_icon_width(layout, item->name, item->icon, compact));
 				}
 			}
 			if (free) {
@@ -1340,12 +1365,13 @@ static void ui_item_rna_size(
 
 	if (!w) {
 		if (type == PROP_ENUM && icon_only) {
-			w = ui_text_icon_width(layout, "", ICON_BLANK1, 0);
+			w = ui_text_icon_width(layout, "", ICON_BLANK1, compact);
 			if (index != RNA_ENUM_VALUE)
 				w += 0.6f * UI_UNIT_X;
 		}
 		else {
-			w = ui_text_icon_width(layout, name, icon, 0);
+			/* not compact for float/int buttons, looks too squashed */
+			w = ui_text_icon_width(layout, name, icon, ELEM(type, PROP_FLOAT, PROP_INT) ? false : compact);
 		}
 	}
 	h = UI_UNIT_Y;
@@ -1382,7 +1408,7 @@ void uiItemFullR(uiLayout *layout, PointerRNA *ptr, PropertyRNA *prop, int index
 	PropertyType type;
 	char namestr[UI_MAX_NAME_STR];
 	int len, w, h;
-	bool slider, toggle, expand, icon_only, no_bg;
+	bool slider, toggle, expand, icon_only, no_bg, compact;
 	bool is_array;
 
 	UI_block_layout_set_current(block, layout);
@@ -1415,7 +1441,12 @@ void uiItemFullR(uiLayout *layout, PointerRNA *ptr, PropertyRNA *prop, int index
 		name = ui_item_name_add_colon(name, namestr);
 	}
 	else if (type == PROP_ENUM && index != RNA_ENUM_VALUE) {
-		name = ui_item_name_add_colon(name, namestr);
+		if (flag & UI_ITEM_R_COMPACT) {
+			name = "";
+		}
+		else {
+			name = ui_item_name_add_colon(name, namestr);
+		}
 	}
 
 	/* menus and pie-menus don't show checkbox without this */
@@ -1443,16 +1474,19 @@ void uiItemFullR(uiLayout *layout, PointerRNA *ptr, PropertyRNA *prop, int index
 	expand = (flag & UI_ITEM_R_EXPAND) != 0;
 	icon_only = (flag & UI_ITEM_R_ICON_ONLY) != 0;
 	no_bg = (flag & UI_ITEM_R_NO_BG) != 0;
+	compact = (flag & UI_ITEM_R_COMPACT) != 0;
 
 	/* get size */
-	ui_item_rna_size(layout, name, icon, ptr, prop, index, icon_only, &w, &h);
+	ui_item_rna_size(layout, name, icon, ptr, prop, index, icon_only, compact, &w, &h);
 
 	if (no_bg)
 		UI_block_emboss_set(block, UI_EMBOSS_NONE);
 	
 	/* array property */
 	if (index == RNA_NO_INDEX && is_array)
-		ui_item_array(layout, block, name, icon, ptr, prop, len, 0, 0, w, h, expand, slider, toggle, icon_only);
+		ui_item_array(
+		            layout, block, name, icon, ptr, prop, len, 0, 0, w, h,
+		            expand, slider, toggle, icon_only, compact);
 	/* enum item */
 	else if (type == PROP_ENUM && index == RNA_ENUM_VALUE) {
 		if (icon && name[0] && !icon_only)
@@ -1641,6 +1675,7 @@ void uiItemsEnumR(uiLayout *layout, struct PointerRNA *ptr, const char *propname
 
 /* Pointer RNA button with search */
 
+
 static void search_id_collection(StructRNA *ptype, PointerRNA *ptr, PropertyRNA **prop)
 {
 	StructRNA *srna;
@@ -1771,7 +1806,7 @@ void uiItemPointerR(uiLayout *layout, struct PointerRNA *ptr, const char *propna
 	/* create button */
 	block = uiLayoutGetBlock(layout);
 
-	ui_item_rna_size(layout, name, icon, ptr, prop, 0, 0, &w, &h);
+	ui_item_rna_size(layout, name, icon, ptr, prop, 0, 0, false, &w, &h);
 	w += UI_UNIT_X; /* X icon needs more space */
 	but = ui_item_with_label(layout, block, name, icon, ptr, prop, 0, 0, 0, w, h, 0);