Path: utzoo!attcan!uunet!husc6!think!ephraim
From: ephraim@think.COM (ephraim vishniac)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Highlight "OK" buttons
Keywords: Dialogs
Message-ID: <27471@think.UUCP>
Date: 7 Sep 88 17:55:57 GMT
References: <3316@homxc.UUCP> <16727@apple.Apple.COM>
Sender: news@think.UUCP
Reply-To: ephraim@vidar.think.com.UUCP (ephraim vishniac)
Organization: Thinking Machines Corporation, Cambridge, MA
Lines: 29

In article <16727@apple.Apple.COM> blob@apple.com.UUCP (Brian Bechtel) writes:
>In article <3316@homxc.UUCP> paco@homxc.UUCP (Herbert Throckmorton) writes:

>>IM vol.1 mentions in the "Dialog Manager" section that one can
>>highlight the default button in a dialog as well, but IM vol.1 doesn't
>>mention how to do that deed, as far as I can tell.

>Page I-407 describes how to highlight a default button in the standard
>way.
>	PenSize(3,3);
>	InsetRect(displayRect, -4, -4);
>	FrameRoundRect(displayRect, 16, 16);

That's how you *draw* the highlighting, which is only a partial answer
to the question of how you highlight a button.  The part that people
often get wrong is *when* you highlight the button.  They tend to
forget that the highlighting might need refreshment (refreshing?)
(redrawing?) when the dialog gets an update event.

It seems like a safe tactic would be to redraw the highlighting
whenever you get any update event for the dialog, but I'm sure
somebody will point out to me a reason that's a bad idea...


Ephraim Vishniac					  ephraim@think.com
Thinking Machines Corporation / 245 First Street / Cambridge, MA 02142-1214

     On two occasions I have been asked, "Pray, Mr. Babbage, if you put
     into the machine wrong figures, will the right answers come out?"