Path: utzoo!utgpu!attcan!uunet!husc6!bloom-beacon!WHEATIES.AI.MIT.EDU!dms From: dms@WHEATIES.AI.MIT.EDU (David M Siegel) Newsgroups: comp.windows.x Subject: question regarding exposure events in toolkit Message-ID: <8808151959.AA04645@cheerios.ai.mit.edu> Date: 15 Aug 88 19:59:16 GMT Sender: daemon@bloom-beacon.MIT.EDU Organization: The Internet Lines: 35 I've written a simple toolkit application that uses a simpleWidgetClass widget. I do raw X graphics operations to the widget's window. I'm having trouble handling exposure events for the window. Whenever the window gets any kind of real exposure event (that is, some rectangle of the window has really changed) I want to redraw the entire window (to keep things simple). Thus, it's necessary for the exposure events to be "compressed". How does one go about doing this? I've tried several schemes, including the following, which get both multiple exposure events in some cases, and miss exposure events altogether in other cases. In main(): XtAddEventHandler(simple, Expose, 1, do_expose, 0); The handler: do_expose(w, data, e) Widget w; char *data; XEvent *e; { XExposeEvent *event = (XExposeEvent *) e; if (event->count == 0) { do_display(last_x, last_y); XFlush(XtDisplay(simple)); } } What's wrong with this? Thanks! -Dave