signal callback delegate or function to connect
void callback(gtk.menu_tool_button.MenuToolButton menuToolButton)
menuToolButton the instance the signal is connected to (optional)
Yes.After to execute callback after default handler, No.After to execute before (default)
Signal ID
Connect to ShowMenu signal.
The ::show-menu signal is emitted before the menu is shown.
It can be used to populate the menu on demand, using gtk.menu_tool_button.MenuToolButton.setMenu.
Note that even if you populate the menu dynamically in this way, you must set an empty menu on the #GtkMenuToolButton beforehand, since the arrow is made insensitive if the menu is not set.