Path: utzoo!attcan!uunet!bloom-beacon!ATHENA.MIT.EDU!swick
From: swick@ATHENA.MIT.EDU (Ralph R. Swick)
Newsgroups: comp.windows.x
Subject: Re: Xlib graphics within widgets
Message-ID: <8910111527.AA02573@LYRE.MIT.EDU>
Date: 11 Oct 89 15:27:18 GMT
References: <46739@bbn.COM>
Sender: daemon@bloom-beacon.MIT.EDU
Organization: DEC/MIT Project Athena
Lines: 21

> What is wrong with my attempt below?  (The thing compiles
> and executes without error but does not draw the rectangle.

MostFrequentBeginningXProblemNumber9 (in a slightly different guise :-) -

You've got to wait for the server to send you an Expose event
before assuming that anything you draw will be displayed.  In
the case of widgets, this is normally accomplished by moving
all your drawing code into the 'expose' widget class procdure.

Since you're attaching your drawing code to an existing widget,
you don't have this option, so instead you could add an event
handler.  You could still loose, though, as there's no guaranteed
call ordering between the event handler and the class expose
procedure.

Your best bet is to read the last part of the Athena Widgets
documentation and customize the Template widget to your heart's
content, or to use a bare Core widget (class 'widgetClass' in R3)
which has no expose procedure and therefore won't destroy any
drawing you do in an expose event handler.