Sets @func to be called when a popup is about to be shown.
@func should use one of
- [method@Gtk.MenuButton.set_popover] - [method@Gtk.MenuButton.set_menu_model]
to set a popup for @menu_button. If @func is non-%NULL, @menu_button will always be sensitive.
Using this function will not reset the menu widget attached to @menu_button. Instead, this can be done manually in @func.
function to call when a popup is about to be shown, but none has been provided via other means, or %NULL to reset to default behavior.
user data to pass to @func.
destroy notify for @user_data
See Implementation
Sets @func to be called when a popup is about to be shown.
@func should use one of
- [method@Gtk.MenuButton.set_popover] - [method@Gtk.MenuButton.set_menu_model]
to set a popup for @menu_button. If @func is non-%NULL, @menu_button will always be sensitive.
Using this function will not reset the menu widget attached to @menu_button. Instead, this can be done manually in @func.