Re: [gtk-list] Signal handler for expose_event

[José Miguel Rodríguez <jmiguel ceselsa es>]

Steffen Boerm wrote:

> Hi.
>
> Is there a way of passing data to a handler for an expose_event?
>
> I'm trying to use the gtk_gl_area widget in order to draw two-dimensional
> graphics in a GTK+ based application.
>
> The routine that draws the graphics needs some additional data that I
> don't want to store in global or static variables. So I hoped I could
> send a pointer to this additional data by passing it to the gtk_signal_connect
> function like this:
>
>   gtk_signal_connect(GTK_OBJECT(this->grafik), "expose_event",
>                      GTK_SIGNAL_FUNC(RedrawGraphics), additional_data);
>
> If I'm not mistaken, the additional_data field seems to be ignored for
> an expose_event. Instead, the handler will get a pointer to a GdkEventExpose.
>
> Best regards,
> cu, Steffen 8-)
>
> --
> Steffen Boerm
> EMail: sbo@numerik.uni-kiel.de
>   WWW: http://www.numerik.uni-kiel.de/~sbo/
>
> --
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Is your redraw function something like this ? :

int RedrawGraphics(GtkWidget *widget, GdkEventExpose *event, gpointer
*additional_data);