Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sun-barr!ames!vsi1!ubvax!pyramid!leadsv!esl!dml
From: dml@esl.com (Denis Lynch)
Newsgroups: comp.sys.next
Subject: Re: Appkit question on fonts & text
Message-ID: <DML.91Feb25170001@acoustat.esl.com>
Date: 26 Feb 91 01:00:01 GMT
References: <8bk42oS00UhWM3B1Yx@andrew.cmu.edu>
Sender: news@esl.ESL.COM
Reply-To: dml@esl.com (Denis Lynch)
Organization: ESL, Inc. Sunnyvale, CA
Lines: 42
In-reply-to: jl3p+@andrew.cmu.edu's message of 18 Feb 91 21:01:40 GMT

In article <8bk42oS00UhWM3B1Yx@andrew.cmu.edu> jl3p+@andrew.cmu.edu (James Ting Lui) writes:

<A lot of stuff I don't know the answer to, unfortunately)

   Finally, I used setAutodisplay: NO/YES to make the symbol insertion
   look cleaner.  The code goes something like this:

       [ theText setAutodisplay: NO ];
       [ theText setSel: start : end ];
       newEnd = start + theSymbolLen;
       [ theText replaceSel: theSymbol ];
       [ theText setFontFamily: [ theSymbolFont name ] ];
       [ theText setAutodisplay: YES ];
       [ theText setSel: newEnd : newEnd ];

   When I pushed the symbol button to insert the symbol,
   I get these funny white blocks on the panel next to
   the button I am pushing.  It's as if the changes made
   to the text object is somehow reflected back to the
   panel where the button is ( the text is on a separate window
   all of its own ).  If the setAutodisplay: YES line above
   is moved up to before the setSelFontFamily: method is called,
   then these white blocks do not show up

Exactly right. Don't mess with a Text object with display disabled!
Or, more specifically, don't do a setSel: with display disabled.
What appears to happen is that disabling display tells the Text not
to do *almost all* of its display stuff. Among other things, that
means it doesn't lockFocus on its way through its operation.

Unfortunately, the highlight part of setSel: doesn't notice that
display is disabled, it just goes right ahead and does the highlight
operation. But wait, it didn't lockFocus! Look at those pretty white
blocks in my menu! See the splotchy background in my window!
(This bug has been there at least since 0.9, when I reported it.)

In the mean time, use disableFlushWindow and reenableFlushWindow.
(Remember the flushWindow or flushWindowIfNeeded).  They work fine,
and have the desired visual effect. Probably not as fast as the
disableDisplay, but that's not important in your case anyway.

--Denis Lynch, ESL Inc.


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