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, 9 insertions, 4 deletions

diff --git a/source/blender/editors/screen/screen_intern.h b/source/blender/editors/screen/screen_intern.h
index 606838ae890..045e5ee6b48 100644
--- a/source/blender/editors/screen/screen_intern.h
+++ b/source/blender/editors/screen/screen_intern.h
@@ -44,6 +44,7 @@ struct Main;
 /* area.c */
 void        ED_area_data_copy(ScrArea *sa_dst, ScrArea *sa_src, const bool do_free);
 void        ED_area_data_swap(ScrArea *sa1, ScrArea *sa2);
+void        screen_area_update_region_sizes(wmWindowManager *wm, wmWindow *win, ScrArea *area);
 void        region_toggle_hidden(struct bContext *C, ARegion *ar, const bool do_fade);
 
 /* screen_edit.c */
@@ -55,12 +56,16 @@ bScreen    *screen_change_prepare(bScreen *screen_old, bScreen *screen_new, stru
 ScrArea    *area_split(bScreen *sc, ScrArea *sa, char dir, float fac, int merge);
 int         screen_area_join(struct bContext *C, bScreen *scr, ScrArea *sa1, ScrArea *sa2);
 int         area_getorientation(ScrArea *sa, ScrArea *sb);
-void        select_connected_scredge(bScreen *sc, ScrEdge *edge);
+void        select_connected_scredge(const wmWindow *win, ScrEdge *edge);
 
 bool        scredge_is_horizontal(ScrEdge *se);
-ScrEdge    *screen_find_active_scredge(const bScreen *sc,
-                                       const int winsize_x, const int winsize_y,
-                                       const int mx, const int my);
+ScrEdge     *screen_area_map_find_active_scredge(
+        const struct ScrAreaMap *area_map,
+        const int winsize_x, const int winsize_y,
+        const int mx, const int my);
+ScrEdge    *screen_find_active_scredge(
+        const wmWindow *win, const bScreen *screen,
+        const int mx, const int my);
 
 struct AZone *is_in_area_actionzone(ScrArea *sa, const int xy[2]);