From: Kevin Ryde <user42@zip.com.au>
To: Marko Rauhamaa <marko@pacujo.net>
Cc: guile-gtk@sources.redhat.com
Subject: Re: Completed GdkWindow; enhanced design
Date: Thu, 15 May 2003 23:19:00 -0000 [thread overview]
Message-ID: <87n0hnhk7x.fsf@zip.com.au> (raw)
In-Reply-To: <m3r870fy1p.fsf@lumo.pacujo.net> (Marko Rauhamaa's message of "15 May 2003 00:50:58 -0700")
Marko Rauhamaa <marko@pacujo.net> writes:
>
> The GdkWindow user_data is either NULL (initially) or an SCM list.
> The first element of the list is the SCM user data (or #f). The
> remainder of the list consists of filter procedures.
>
> You will see that gdk_window_mark will simply return its user_data to
> protect it against GC.
Are you aware that gtk stores a widget (pointer) in the GdkWindow
user_data? So for instance you can't assume a window obtained from
gtk_widget_window will have an SCM in the user_data field.
The gtk 2 docs suggest one should store only NULL or a widget, because
the gtk event handler will expect that. The gtk 1.2 code looks like
gtk_main_do_event and gtk_get_event_widget don't attempt any
validation.
(Presumably this issue must have shown up when you tested your
changes, so I wonder if I've badly missed something.)
next prev parent reply other threads:[~2003-05-15 23:19 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-15 7:59 Marko Rauhamaa
2003-05-15 23:19 ` Kevin Ryde [this message]
2003-05-16 0:58 ` Marko Rauhamaa
2003-05-16 1:23 ` Kevin Ryde
2003-05-16 5:43 ` Marko Rauhamaa
2003-05-16 5:58 ` Marko Rauhamaa
2003-05-16 22:36 ` Kevin Ryde
2003-05-16 22:59 ` Marko Rauhamaa
2003-05-21 13:20 ` first checkin of gnome-guile in guile-gtk CVS Stan Pinte
2003-08-22 23:56 ` gdk-window-set-geometry-hints Kevin Ryde
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