Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!ncar!unmvax!rye.cs.unm.edu!stone
From: stone@rye.cs.unm.edu (Andrew Stone)
Newsgroups: comp.sys.next
Subject: Re: Overlapping Button Matrices, upper doesn't occlude lower
Message-ID: <574@unmvax.unm.edu>
Date: 20 Nov 89 15:45:31 GMT
References: <616@ncis.tis.llnl.gov>
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Reply-To: stone@rye.cs.unm.edu ()
Distribution: usa
Organization: University of New Mexico at Albuquerque
Lines: 35

In article <616@ncis.tis.llnl.gov> carlson@lance.tis.llnl.gov (John Carlson) writes:
>
>I decided to build a small keyboard with Interface Builder
>(much like Synthesizer.app).  I decided to use two button matrices,
>one matrix for the white keys, and the other for the black keys
>(with Transparent, Disabled for B-C and E-F gaps).  I used two
>icons for the white keys (pressed and normal) and two for the black.
>The prototype button was able to play the System sound I specified, but
>neither the Test Mode or compiled version would play the sound (I
>tried one sound for all buttons in the matrix).
>
>When testing and in the final version, if I pressed a white key,
>The white icon would draw over the black icon.  Does someone
>have an easy fix which would keep the black matrix from being
>drawn over?
>
>Thanks,
>
>John Carlson
>carlson@tis.llnl.gov

I had a similar problem with CharFind, since the virtual keyboard has
staggered keys. 
The solution: Blit your hiliting on yourself. Have your keys be transparent,
and a subview of KeyBoardView. KeyBoardView is the keyboard's bits without
any key down. When a button gets a mousedown, blit its highlight onto the
keyBoardView,SOVER. On mouseUp, send keyBoardView a display message. You'll
have to subClass matrix to override the mousedown.

andrew

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!!         Andrew Stone             !!       Stone Design Software      !!
!!      stone@hydra.unm.edu         <>      Albuquerque, New Mexico     !!
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