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, 43 insertions, 33 deletions

diff --git a/source/blender/editors/interface/interface_utils.c b/source/blender/editors/interface/interface_utils.c
index f0317087ddc..f28da5a666b 100644
--- a/source/blender/editors/interface/interface_utils.c
+++ b/source/blender/editors/interface/interface_utils.c
@@ -157,62 +157,72 @@ uiBut *uiDefAutoButR(uiBlock *block, PointerRNA *ptr, PropertyRNA *prop, int ind
  * \a check_prop callback filters functions to avoid drawing certain properties,
  * in cases where PROP_HIDDEN flag can't be used for a property.
  */
-int uiDefAutoButsRNA(
+eAutoPropButsReturn uiDefAutoButsRNA(
         uiLayout *layout, PointerRNA *ptr,
         bool (*check_prop)(PointerRNA *, PropertyRNA *),
-        const char label_align)
+        const eButLabelAlign label_align, const bool compact)
 {
+	eAutoPropButsReturn return_info = UI_PROP_BUTS_NONE_ADDED;
 	uiLayout *split, *col;
 	int flag;
 	const char *name;
-	int tot = 0;
-
-	assert(ELEM(label_align, '\0', 'H', 'V'));
 
 	RNA_STRUCT_BEGIN (ptr, prop)
 	{
 		flag = RNA_property_flag(prop);
-		if (flag & PROP_HIDDEN || (check_prop && check_prop(ptr, prop) == 0))
+
+		if (flag & PROP_HIDDEN) {
+			continue;
+		}
+		if (check_prop && check_prop(ptr, prop) == 0) {
+			return_info |= UI_PROP_BUTS_ANY_FAILED_CHECK;
 			continue;
+		}
 
-		if (label_align != '\0') {
-			PropertyType type = RNA_property_type(prop);
-			const bool is_boolean = (type == PROP_BOOLEAN && !RNA_property_array_check(prop));
+		switch (label_align) {
+			case UI_BUT_LABEL_ALIGN_COLUMN:
+			case UI_BUT_LABEL_ALIGN_SPLIT_COLUMN:
+			{
+				PropertyType type = RNA_property_type(prop);
+				const bool is_boolean = (type == PROP_BOOLEAN && !RNA_property_array_check(prop));
 
-			name = RNA_property_ui_name(prop);
+				name = RNA_property_ui_name(prop);
 
-			if (label_align == 'V') {
-				col = uiLayoutColumn(layout, true);
+				if (label_align == UI_BUT_LABEL_ALIGN_COLUMN) {
+					col = uiLayoutColumn(layout, true);
 
-				if (!is_boolean)
-					uiItemL(col, name, ICON_NONE);
-			}
-			else {  /* (label_align == 'H') */
-				BLI_assert(label_align == 'H');
-				split = uiLayoutSplit(layout, 0.5f, false);
+					if (!is_boolean)
+						uiItemL(col, name, ICON_NONE);
+				}
+				else {
+					BLI_assert(label_align == UI_BUT_LABEL_ALIGN_SPLIT_COLUMN);
+					split = uiLayoutSplit(layout, 0.5f, false);
 
-				col = uiLayoutColumn(split, false);
-				uiItemL(col, (is_boolean) ? "" : name, ICON_NONE);
-				col = uiLayoutColumn(split, false);
-			}
+					col = uiLayoutColumn(split, false);
+					uiItemL(col, (is_boolean) ? "" : name, ICON_NONE);
+					col = uiLayoutColumn(split, false);
+				}
 
-			/* may meed to add more cases here.
-			 * don't override enum flag names */
+				/* may meed to add more cases here.
+				 * don't override enum flag names */
 
-			/* name is shown above, empty name for button below */
-			name = (flag & PROP_ENUM_FLAG || is_boolean) ? NULL : "";
-		}
-		else {
-			col = layout;
-			name = NULL; /* no smart label alignment, show default name with button */
+				/* name is shown above, empty name for button below */
+				name = (flag & PROP_ENUM_FLAG || is_boolean) ? NULL : "";
+
+				break;
+			}
+			case UI_BUT_LABEL_ALIGN_NONE:
+				col = layout;
+				name = NULL; /* no smart label alignment, show default name with button */
+				break;
 		}
 
-		uiItemFullR(col, ptr, prop, -1, 0, 0, name, ICON_NONE);
-		tot++;
+		uiItemFullR(col, ptr, prop, -1, 0, compact ? UI_ITEM_R_COMPACT : 0, name, ICON_NONE);
+		return_info &= ~UI_PROP_BUTS_NONE_ADDED;
 	}
 	RNA_STRUCT_END;
 
-	return tot;
+	return return_info;
 }
 
 /* *** RNA collection search menu *** */