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10.6. How do I avoid having my gtk.Window instance destroyed when I click on the window's close button? (or, When I redisplay my window, all my child widgets are missing and I get a bunch of Gtk-Critical errors!)

As you saw in FAQ 10.5, closing a window using the window manager, by default, causes it to be destroyed. In that example, we connected to 'delete-event' to break the mainloop when this happened, but at other times you may want to customize further the behaviour you get.

You can avoid the window's destruction by attaching a callback handler to the 'delete-event' handler in the GtkWindow and having it return 'True':

 win = gtk.Window()

 def on_delete_event(widget, event):
   print "Delete was called but I won't die!"
   return True

A common thing to do is call the 'hide()' method in the handler.

The 'return True' part indicates that the default handler is _not_ to be called, and therefore the window will not be destroyed.

The actual process of event propagation is not simple to grasp and is better described at [www.gtk.org] .

It is important to note that you should not attach to 'destroy-event', as it cannot be overridden (it occurs server-side, and no client callback is triggered). Your window will always be destroyed, and your handler will not be called at all.

For gtk.Dialog its easier: just test the response id from running the dialogue against gtk.RESPONSE_DELETE_EVENT. It will match in time to be able to prevent the widget be destroyed, and there is no need to connect a signal.

For the specific case of GnomeAbout, see FAQ 10.13.

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