UI: top-bar reorganization

This hides the top-bar by default for everything
besides paint/sculpt workspaces.

- Use the top-bar mainly for active tool settings &
  popovers panel options.
  (transform / snap settings are an exception for this convention).
- Only show the top-bar (by default)
  in paint work-spaces (sculpt / texture-paint / grease-pencil).
- Add an active-tool panel to the sidebar.
- Split 3D view tabs into (Item / Tool / View).

D4721 with minor changes.

Further work is needed for the top-bar and image-editor.

2 files changed, 30 insertions, 0 deletions

diff --git a/source/blender/blenloader/intern/versioning_280.c b/source/blender/blenloader/intern/versioning_280.c
index ae8bf8010cc..f9f87731197 100644
--- a/source/blender/blenloader/intern/versioning_280.c
+++ b/source/blender/blenloader/intern/versioning_280.c
@@ -3245,6 +3245,8 @@ void blo_do_versions_280(FileData *fd, Library *UNUSED(lib), Main *bmain)
 
             ARegion *ar_header = do_versions_find_region(regionbase, RGN_TYPE_HEADER);
             BLI_insertlinkbefore(regionbase, ar_header, ar);
+            /* Hide by default, enable for painting workspaces (startup only). */
+            ar->flag |= RGN_FLAG_HIDDEN | RGN_FLAG_HIDDEN_BY_USER;
           }
           if (ar != NULL) {
             SET_FLAG_FROM_TEST(ar->flag, ar->flag & RGN_FLAG_HIDDEN_BY_USER, RGN_FLAG_HIDDEN);
diff --git a/source/blender/blenloader/intern/versioning_defaults.c b/source/blender/blenloader/intern/versioning_defaults.c
index b5b86224644..7674c7cadcd 100644
--- a/source/blender/blenloader/intern/versioning_defaults.c
+++ b/source/blender/blenloader/intern/versioning_defaults.c
@@ -293,6 +293,34 @@ void BLO_update_defaults_startup_blend(Main *bmain, const char *app_template)
       }
     }
 
+    /* Show toopbar for sculpt/paint modes. */
+    for (bScreen *screen = bmain->screens.first; screen; screen = screen->id.next) {
+      bool show_tool_header = false;
+      if (app_template == NULL) {
+        if (STR_ELEM(screen->id.name + 2, "Sculpting", "Texture Paint")) {
+          show_tool_header = true;
+        }
+      }
+      else if (STREQ(app_template, "2D_Animation")) {
+        if (STR_ELEM(screen->id.name + 2, "Sculpting", "Texture Paint")) {
+          show_tool_header = true;
+        }
+      }
+
+      if (show_tool_header) {
+        for (ScrArea *sa = screen->areabase.first; sa; sa = sa->next) {
+          for (SpaceLink *sl = sa->spacedata.first; sl; sl = sl->next) {
+            ListBase *regionbase = (sl == sa->spacedata.first) ? &sa->regionbase : &sl->regionbase;
+            for (ARegion *ar = regionbase->first; ar; ar = ar->next) {
+              if (ar->regiontype == RGN_TYPE_TOOL_HEADER) {
+                ar->flag &= ~(RGN_FLAG_HIDDEN | RGN_FLAG_HIDDEN_BY_USER);
+              }
+            }
+          }
+        }
+      }
+    }
+
     for (Scene *scene = bmain->scenes.first; scene; scene = scene->id.next) {
       BLI_strncpy(scene->r.engine, RE_engine_id_BLENDER_EEVEE, sizeof(scene->r.engine));