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, 11 insertions, 2 deletions

diff --git a/source/blender/makesrna/intern/rna_ui.c b/source/blender/makesrna/intern/rna_ui.c
index 40657b3a225..bb4f6719fbc 100644
--- a/source/blender/makesrna/intern/rna_ui.c
+++ b/source/blender/makesrna/intern/rna_ui.c
@@ -568,7 +568,7 @@ static void rna_Header_unregister(Main *UNUSED(bmain), StructRNA *type)
 
 	if (!ht)
 		return;
-	if (!(art = region_type_find(NULL, ht->space_type, RGN_TYPE_HEADER)))
+	if (!(art = region_type_find(NULL, ht->space_type, ht->region_type)))
 		return;
 	
 	RNA_struct_free_extension(type, &ht->ext);
@@ -592,6 +592,7 @@ static StructRNA *rna_Header_register(
 
 	/* setup dummy header & header type to store static properties in */
 	dummyheader.type = &dummyht;
+	dummyht.region_type = RGN_TYPE_HEADER; /* RGN_TYPE_HEADER by default, may be overridden */
 	RNA_pointer_create(NULL, &RNA_Header, &dummyheader, &dummyhtr);
 
 	/* validate the python class */
@@ -604,7 +605,7 @@ static StructRNA *rna_Header_register(
 		return NULL;
 	}
 
-	if (!(art = region_type_find(reports, dummyht.space_type, RGN_TYPE_HEADER)))
+	if (!(art = region_type_find(reports, dummyht.space_type, dummyht.region_type)))
 		return NULL;
 
 	/* check if we have registered this header type before, and remove it */
@@ -1240,6 +1241,14 @@ static void rna_def_header(BlenderRNA *brna)
 	RNA_def_property_flag(prop, PROP_REGISTER);
 	RNA_def_property_ui_text(prop, "Space type", "The space where the header is going to be used in");
 
+	prop = RNA_def_property(srna, "bl_region_type", PROP_ENUM, PROP_NONE);
+	RNA_def_property_enum_sdna(prop, NULL, "type->region_type");
+	RNA_def_property_enum_default(prop, RGN_TYPE_HEADER);
+	RNA_def_property_enum_items(prop, rna_enum_region_type_items);
+	RNA_def_property_flag(prop, PROP_REGISTER_OPTIONAL);
+	RNA_def_property_ui_text(prop, "Region Type", "The region where the header is going to be used in "
+	                         "(defaults to header region)");
+
 	RNA_define_verify_sdna(1);
 }