You can override the context menus for buttons and ui list items.
See Add Operator to Right Click Menu for Operators - #2 by iceythe
Here’s an example that adds a label to the context menu when a vertex group is right clicked.
import bpy
class WM_MT_button_context(bpy.types.Menu):
bl_label = ""
# Leave empty for compatibility.
def draw(self, context): pass
# Your draw function.
def draw(self, context):
if hasattr(context, "button_pointer"):
print("Clicked: ", context.button_pointer)
if isinstance(context.button_pointer, bpy.types.VertexGroups):
layout = self.layout
layout.label(text="I'm in vertex groups context menu!")
if hasattr(context, "button_prop"):
print("Property:", context.button_prop.identifier)
if hasattr(context, "ui_list") and context.ui_list is not None:
print("UI List: ", context.ui_list.bl_idname)
if __name__ == "__main__":
# Register menu only if it doesn't already exist.
rcmenu = getattr(bpy.types, "WM_MT_button_context", None)
if rcmenu is None:
bpy.utils.register_class(WM_MT_button_context)
rcmenu = WM_MT_button_context
# Retrieve a python list for inserting draw functions.
draw_funcs = rcmenu._dyn_ui_initialize()
draw_funcs.append(draw)
