This signal is emitted when the toolbar needs information from
about whether the item should appear in the toolbar overflow menu. In
response the tool item should either
NULLpointer and return
TRUEto indicate that the item should not appear in the overflow menu
gtk_tool_item_set_proxy_menu_item()with a new menu item and return
FALSEto indicate that the signal was not handled by the item. This means that the item will not appear in the overflow menu unless a later handler installs a menu item.
The toolbar may cache the result of this signal. When the tool item changes
how it will respond to this signal it must call
to invalidate the cache and ensure that the toolbar rebuilds its overflow menu.
|Default handler: |
The default handler is called after the handlers added via
|Available since: 3.0|