MenuToolButton.addOnShowMenu

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_set_menu().

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.

class MenuToolButton
gulong
addOnShowMenu

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