A Sex, 2003-12-05 �s 18:13, Jean-Baptiste Cazier escreveu:
> hi !
>
> After further investigation it seems that the routine called by my expose_event
> signal is generating itself new expose_event...
>
> To avoid that effect I would like to block the signal when entering the routine and
> unblock it while leaving
> but I have problem transferring the event id through the routine itself and to knwo
> to what I should apply it to
> How should i use signal_handler_block ?
>
> I would like to do somethhing like
> ...
> self.area = gtk.DrawingArea()
> self.area.add_events(gtk.gdk.POINTER_MOTION_MASK)
> self.area.add_events(gtk.gdk.BUTTON_RELEASE_MASK)
> self.area.add_events(gtk.gdk.BUTTON_PRESS_MASK )
> singal_id=self.area.connect("expose-event", self.area_expose_cb)
> print "id is ", signal_id
> ...
>
> def area_expose_cb(self, area, event):
> """ Update the DrawingArea """
>
> area.signal_handler_block(signal_id)
> ...
> Do something on the Drawing Area
> ...
> area.signal_handler_unblock(signal_id)
> return gtk.TRUE
>
> Any help would be appreciated
Why complicate? Why not simply discard recursive expose events? I
must say I find it very strange that gtk is sending expose events
recursively. I _think_ that the only way this could happen would be if
you were running the gtk main loop (or dialog.run) inside the expose
event handler. This would be a Bad Idea (TM)!
Anyway, an alternative to signal handler blocking, which doesn't seem
to be working (I read down the thread), would be a simple trick of
locking:
def area_expose_cb(self, area, event):
""" Update the DrawingArea """
if self.__area_expose_cb_lock: return True
self.__area_expose_cb_lock = True
...
Do something on the Drawing Area
...
self.__area_expose_cb_lock = False
return gtk.TRUE
One more thing. If your struggling with complex drawings, you might
want to use the gnome.Canvas widget instead.
Regards.
--
Gustavo J. A. M. Carneiro
<[EMAIL PROTECTED]> <[EMAIL PROTECTED]>
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