Thanks for clearifying these issues. I cut a few corners in order to
give a newbie a quick answer. Appearently I cut a bit too much. I'll
learn and improve. 8-)
Regards,
Dov
On Sun, Sep 15, 2002 at 07:43:30AM -0400, Paul Davis wrote:
> >First ignoring the PDU part. You draw to the drawing are with the gc_draw_*()
> >functions in the exposure event callback. Here is the critical code
> >that you need to set up:
> >
> >
> > gboolean event_handler (GtkWidget *drawing_area,
> > GdkEvent *event,
> > gpointer client_data)
> > {
> > if (event->type == GDK_EXPOSE)
> > draw_graphics((MyApp*)client_data);
> >
> > return 1;
> > }
>
> a few points here:
>
> * connecting to the "event" signal is wasteful. it means that
> your callback is executed for every single event on the
> widget. use the specific desired event if there is one,
> in this case "expose_event"
>
> * returning 1 is not correct. signal handlers return TRUE or
> FALSE. small point, perhaps, but ...
>
> * return TRUE by default from a callback connected to "event"
> is a bad idea.
>
> >About the PDU that you mentioned (though I have no idea what it is).
> >Whenever you have data to read on that channel you should get a
> >callback in which you read the data. You should then call draw_graphics()
> >manually to update the display.
>
> no, thats not right. you would call either gtk_widget_queue_draw(), or
> use a GDK method such as gdk_window_invalidate_rect(). but the author
> already knows this. i think his problem(s) arise from not grasping the
> central role of the expose_event in GTK+ (a common problem).
>
> --p
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--
___ ___
/ o \ o \
Dov Grobgeld ( o o ) o |
The Weizmann Institute of Science, Israel \ o /o o /
"Where the tree of wisdom carries oranges" | | | |
_| |_ _| |_
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