Good questions and remarks. As for the warnings, I've already filed a bug
sometime ago but noone has done anything about it. The
bug-->http://bugzilla.gnome.org/show_bug.cgi?id=606903
Date: Sun, 14 Feb 2010 11:26:42 +0100
Subject: custom widget example from the gtkmm book is out of date
From: [email protected]
To: [email protected]
Hi,
I the custom widget example from the gtkmm book seems to be out of date as it
generates the following errors when ending:
(test:2683): Gdk-WARNING **: losing last reference to undestroyed window
(test:2683): Gdk-CRITICAL **: gdk_window_hide: assertion `GDK_IS_WINDOW
(window)' failed
(test:2683): Gdk-CRITICAL **: gdk_window_set_user_data: assertion
`GDK_IS_WINDOW (window)' failed
(test:2683): Gdk-CRITICAL **: _gdk_window_destroy_hierarchy: assertion
`GDK_IS_WINDOW (window)' failed
(test:2683): GLib-GObject-CRITICAL **: g_object_unref: assertion `G_IS_OBJECT
(object)' failed
This has to do with the Gdk::Window created in the mywidget::on_realize method.
It is not properly destroyed at the end of the example program.
I've been playing with gtkmm for about a year now, and I found the way to
create new widgets extremely confusing and I found nowhere a proper
documentation about that (except the above example):
The reason for having two "constructor methods" called successively, the actual
constructor and the on_realize method (and on the other hand destructor and
on_unrealize for destruction) is unclear.
I understand it has to do with the low-level Gdk resources, but for instance in
this example, how is the Gdk::Window destroyed? Does the programmer have the
responsability to destroy it or should he bother only about the Gtk widgets?
Cheers!
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