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, 18 insertions, 3 deletions

diff --git a/source/blender/editors/space_clip/space_clip.c b/source/blender/editors/space_clip/space_clip.c
index 478254fb165..ba9684411b3 100644
--- a/source/blender/editors/space_clip/space_clip.c
+++ b/source/blender/editors/space_clip/space_clip.c
@@ -256,12 +256,14 @@ static SpaceLink *clip_new(const bContext *C)
 	ar->regiontype = RGN_TYPE_TOOLS;
 	ar->alignment = RGN_ALIGN_LEFT;
 
-	/* tool properties */
+#ifndef WITH_REDO_REGION_REMOVAL
+	/* tools view */
 	ar = MEM_callocN(sizeof(ARegion), "tool properties for clip");
 
 	BLI_addtail(&sc->regionbase, ar);
 	ar->regiontype = RGN_TYPE_TOOL_PROPS;
 	ar->alignment = RGN_ALIGN_BOTTOM | RGN_SPLIT_PREV;
+#endif
 
 	/* properties view */
 	ar = MEM_callocN(sizeof(ARegion), "properties for clip");
@@ -889,20 +891,25 @@ static void clip_refresh(const bContext *C, ScrArea *sa)
 	SpaceClip *sc = (SpaceClip *)sa->spacedata.first;
 	ARegion *ar_main = BKE_area_find_region_type(sa, RGN_TYPE_WINDOW);
 	ARegion *ar_tools = BKE_area_find_region_type(sa, RGN_TYPE_TOOLS);
-	ARegion *ar_tool_props = BKE_area_find_region_type(sa, RGN_TYPE_TOOL_PROPS);
 	ARegion *ar_preview = ED_clip_has_preview_region(C, sa);
 	ARegion *ar_properties = ED_clip_has_properties_region(sa);
 	ARegion *ar_channels = ED_clip_has_channels_region(sa);
 	bool main_visible = false, preview_visible = false, tools_visible = false;
-	bool tool_props_visible = false, properties_visible = false, channels_visible = false;
+	bool properties_visible = false, channels_visible = false;
 	bool view_changed = false;
+#ifndef WITH_REDO_REGION_REMOVAL
+	ARegion *ar_tool_props = BKE_area_find_region_type(sa, RGN_TYPE_TOOL_PROPS);
+	bool tool_props_visible = false;
+#endif
 
 	switch (sc->view) {
 		case SC_VIEW_CLIP:
 			main_visible = true;
 			preview_visible = false;
 			tools_visible = true;
+#ifndef WITH_REDO_REGION_REMOVAL
 			tool_props_visible = true;
+#endif
 			properties_visible = true;
 			channels_visible = false;
 			break;
@@ -910,7 +917,9 @@ static void clip_refresh(const bContext *C, ScrArea *sa)
 			main_visible = false;
 			preview_visible = true;
 			tools_visible = false;
+#ifndef WITH_REDO_REGION_REMOVAL
 			tool_props_visible = false;
+#endif
 			properties_visible = false;
 			channels_visible = false;
 
@@ -920,7 +929,9 @@ static void clip_refresh(const bContext *C, ScrArea *sa)
 			main_visible = false;
 			preview_visible = true;
 			tools_visible = false;
+#ifndef WITH_REDO_REGION_REMOVAL
 			tool_props_visible = false;
+#endif
 			properties_visible = false;
 			channels_visible = true;
 
@@ -1001,6 +1012,7 @@ static void clip_refresh(const bContext *C, ScrArea *sa)
 		}
 	}
 
+#ifndef WITH_REDO_REGION_REMOVAL
 	if (tool_props_visible) {
 		if (ar_tool_props && (ar_tool_props->flag & RGN_FLAG_HIDDEN)) {
 			ar_tool_props->flag &= ~RGN_FLAG_HIDDEN;
@@ -1024,6 +1036,7 @@ static void clip_refresh(const bContext *C, ScrArea *sa)
 			view_changed = true;
 		}
 	}
+#endif
 
 	if (preview_visible) {
 		if (ar_preview && (ar_preview->flag & RGN_FLAG_HIDDEN)) {
@@ -1607,6 +1620,7 @@ void ED_spacetype_clip(void)
 
 	BLI_addhead(&st->regiontypes, art);
 
+#ifndef WITH_REDO_REGION_REMOVAL
 	/* tool properties */
 	art = MEM_callocN(sizeof(ARegionType), "spacetype clip tool properties region");
 	art->regionid = RGN_TYPE_TOOL_PROPS;
@@ -1619,6 +1633,7 @@ void ED_spacetype_clip(void)
 	ED_clip_tool_props_register(art);
 
 	BLI_addhead(&st->regiontypes, art);
+#endif
 
 	/* regions: header */
 	art = MEM_callocN(sizeof(ARegionType), "spacetype clip region");