UI: Support C defined menu types to listen to notifiers

Needed to dynamically load assets as menu items, see cf985180551d and
99e5024e97f1. The next commit will add the listener for the node add menu.

1 files changed, 15 insertions, 0 deletions

diff --git a/source/blender/editors/interface/interface.cc b/source/blender/editors/interface/interface.cc
index 1f88d25af2b..331d1581db5 100644
--- a/source/blender/editors/interface/interface.cc
+++ b/source/blender/editors/interface/interface.cc
@@ -3474,6 +3474,7 @@ void UI_block_free(const bContext *C, uiBlock *block)
 
   BLI_freelistN(&block->saferct);
   BLI_freelistN(&block->color_pickers.list);
+  BLI_freelistN(&block->dynamic_listeners);
 
   ui_block_free_button_groups(block);
   ui_block_free_views(block);
@@ -3481,6 +3482,20 @@ void UI_block_free(const bContext *C, uiBlock *block)
   MEM_freeN(block);
 }
 
+void UI_block_listen(const uiBlock *block, const wmRegionListenerParams *listener_params)
+{
+  /* Don't need to let invisible blocks (old blocks from previous redraw) listen. */
+  if (!block->active) {
+    return;
+  }
+
+  LISTBASE_FOREACH (uiBlockDynamicListener *, listener, &block->dynamic_listeners) {
+    listener->listener_func(listener_params);
+  }
+
+  ui_block_views_listen(block, listener_params);
+}
+
 void UI_blocklist_update_window_matrix(const bContext *C, const ListBase *lb)
 {
   ARegion *region = CTX_wm_region(C);