UI: Superimposed pin icon for workspace scene pinning in the scene switcher

Followup to the previous commit, to display a pin icon in the scene switcher.
This is a good indicator to have and such workspace-wide functionality should
be available in the topbar, close to what it belongs to (scene switching).
Downside is that it makes this already crowded region even more crowded. But
thanks to the use of superimposed icons, it's not too noisy visually.

Differential Revision: https://developer.blender.org/D11890

Reviewed by: Campbell Barton

1 files changed, 30 insertions, 0 deletions

diff --git a/source/blender/editors/screen/workspace_edit.c b/source/blender/editors/screen/workspace_edit.c
index 0535a270176..cb29f15420c 100644
--- a/source/blender/editors/screen/workspace_edit.c
+++ b/source/blender/editors/screen/workspace_edit.c
@@ -585,6 +585,35 @@ static void WORKSPACE_OT_reorder_to_front(wmOperatorType *ot)
   ot->exec = workspace_reorder_to_front_exec;
 }
 
+static int workspace_scene_pin_toggle(bContext *C, wmOperator *UNUSED(op))
+{
+  WorkSpace *workspace = workspace_context_get(C);
+
+  /* Trivial. The operator is only needed to display a superimposed extra icon, which
+   * requires an operator. */
+  workspace->flags ^= WORKSPACE_USE_PIN_SCENE;
+
+  WM_event_add_notifier(C, NC_WORKSPACE, NULL);
+
+  return OPERATOR_FINISHED;
+}
+
+static void WORKSPACE_OT_scene_pin_toggle(wmOperatorType *ot)
+{
+  /* identifiers */
+  ot->name = "Pin Scene to Workspace";
+  ot->description =
+      "Remember the last used scene for the current workspace and switch to it whenever this "
+      "workspace is activated again";
+  ot->idname = "WORKSPACE_OT_scene_pin_toggle";
+
+  /* api callbacks */
+  ot->poll = workspace_context_poll;
+  ot->exec = workspace_scene_pin_toggle;
+
+  ot->flag = OPTYPE_INTERNAL;
+}
+
 void ED_operatortypes_workspace(void)
 {
   WM_operatortype_append(WORKSPACE_OT_duplicate);
@@ -593,6 +622,7 @@ void ED_operatortypes_workspace(void)
   WM_operatortype_append(WORKSPACE_OT_append_activate);
   WM_operatortype_append(WORKSPACE_OT_reorder_to_back);
   WM_operatortype_append(WORKSPACE_OT_reorder_to_front);
+  WM_operatortype_append(WORKSPACE_OT_scene_pin_toggle);
 }
 
 /** \} Workspace Operators */