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, 16 insertions, 11 deletions

diff --git a/source/blender/blenkernel/intern/screen.c b/source/blender/blenkernel/intern/screen.c
index 8283655503c..77f7b5f847e 100644
--- a/source/blender/blenkernel/intern/screen.c
+++ b/source/blender/blenkernel/intern/screen.c
@@ -397,6 +397,7 @@ void BKE_screen_area_free(ScrArea *sa)
 	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);
@@ -404,10 +405,21 @@ void BKE_screen_area_free(ScrArea *sa)
 	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)
 {
-	ScrArea *sa, *san;
 	ARegion *ar;
 
 	/* No animdata here. */
@@ -416,18 +428,11 @@ void BKE_screen_free(bScreen *sc)
 		BKE_area_region_free(NULL, ar);
 
 	BLI_freelistN(&sc->regionbase);
-	
-	for (sa = sc->areabase.first; sa; sa = san) {
-		san = sa->next;
-		BKE_screen_area_free(sa);
-	}
-	
-	BLI_freelistN(&sc->vertbase);
-	BLI_freelistN(&sc->edgebase);
-	BLI_freelistN(&sc->areabase);
+
+	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);
 }