Re: Help replacing GtkDrawingArea with GtkLayout

[Richard Shann <richard rshann plus com>]

On Mon, 2014-03-10 at 09:29 +0100, Joël Krähemann wrote:
> On Mon, 2014-03-10 at 09:26 +0100, Joël Krähemann wrote:
> > On Sun, 2014-03-09 at 14:03 +0000, Richard Shann wrote:
> > > > From: Jo?l Kr?hemann <joel weedlight ch>
> > > > To: gtk-app-devel-list gnome org
> > > > Subject: Re: Help replacing GtkDrawingArea with GtkLayout
> > > > Message-ID: <1394327737 3369 3 camel debian>
> > > > Content-Type: text/plain; charset="us-ascii"
> > > >
> > > > Hi,
> > > >
> > > > Didn't before but may be check the following:
> > > >
> > > > g_object_set(G_OBJECT(layout),
> > > >   "app-paintable\0", TRUE, 
> > > >   NULL);
> > >
> > > Hmm, I hadn't noticed that property. It is presumably set ok since I can
> > > draw and place widgets on the GtkLayout. It was the configure and scroll
> > > events that I didn't receive.
> > > BTW why do you have two NULL bytes at the end of the property name
> > > (AFAIK only one is needed)?
> > >
> > > Richard
> >
> > Assumed you get annoyed by warnings, you can slightly disable it. It's
> > distribution depend what flags are per default on. For further reading:
> >
> > http://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html
> >
> > regards
> > Joël
> >
> >
> > _______________________________________________
> > gtk-app-devel-list mailing list
> > gtk-app-devel-list gnome org
> > https://mail.gnome.org/mailman/listinfo/gtk-app-devel-list
>
> You should ask why I forget to add GDK_SCROLL_MASK

Well, I didn't ask because I already tried it. The GtkLayout didn't
receive that nor the configure signal even with setting
GDK_ALL_EVENTS_MASK. What *did* work is receiving the events on the
parent.
But I am still curious why you have two NULL bytes termination your
signal name strings, the extra one must surely get ignored...

Richard


> gtk_widget_set_events (GTK_WIDGET (layout),
>   GDK_EXPOSURE_MASK 
>   | GDK_LEAVE_NOTIFY_MASK 
>   | GDK_BUTTON_PRESS_MASK 
>   | GDK_BUTTON_RELEASE_MASK 
>   | GDK_POINTER_MOTION_MASK 
>   | GDK_POINTER_MOTION_HINT_MASK 
>   | GDK_SCROLL_MASK
>   );
>
> then you have to
>
> g_signal_connect(G_OBJECT(layout), "scroll-event\0",
>   G_CALLBACK(layout_callback), NULL);
>
>
> gboolean
> layout_callback(GtkWidget *widget, GdkEvent *event, gpointer user_data)
> {
>   /* do your thing */
>
>   return(FALSE);
> }