Re: presentation actions

• To: moon@brazil.cambridge.apple.com, SWM@sapsucker.scrc.symbolics.com
• Subject: Re: presentation actions
• From: Scott McKay <SWM@sapsucker.scrc.symbolics.com>
• Date: Fri, 8 Feb 1991 10:02-0500
• Cc: gadbois@cs.utexas.edu, clim@BBN.COM
• In-Reply-To: <9102080049.AA12479@brazil.cambridge.apple.com>

    Date: Thu, 7 Feb 1991 19:38 EST
    From: "David A. Moon" <moon@brazil.cambridge.apple.com>

    > Date: Thu, 7 Feb 1991 16:57-0500
    > From: Scott McKay <SWM@sapsucker.scrc.symbolics.com>
    > 
    > 	    Date: Thu, 7 Feb 1991 12:03 EST
    > 	    From: kanderso@dino.bbn.com
    > 
    >     OK, but then what is the canonical way of doing some side effect without
    >     going through a command?  For example, suppose I wanted to have some
    >     mosue-sensitive buttons that control what is being displayed like those
    >     little triangle things in Mac OS 7 directory listings.  I though that
    >     presentation actions would be the way to implement these.  Or is this
    >     kind of usage considered to be OK?
    > 
    > I haven't yet seen MacOS 7, so I don't know what it is you are referring
    > to.  If it is just redisplay of data that can take place independent of
    > changing application state, then it might be OK.

    That's what it is.  It's enabling or disabling showing the next level of
    structure in a tree, and doesn't change any state aside from the display,
    let alone interfering with commands.

Since Moon didn't say so explicitly: "In that case, it is appropriate to
use a presentation action for this."

0,,

• Re: presentation actions
• From: "David A. Moon" <moon@brazil.cambridge.apple.com>

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