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From: Griffiths.R@AppleLink.Apple.com (Rob Griffiths)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: Misc Easy HC Questions
Message-ID: <10164@goofy.Apple.COM>
Date: 11 Sep 90 23:59:21 GMT
References: <11792@crdgw1.crd.ge.com>
Sender: usenet@Apple.COM
Organization: Apple Computer, Inc.
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There have been a couple of recent questions concerning double clicking on 
objects.  As far as I know, there is no truly easy way to check 
this...However, I normally use the following:

on mouseup
  put the ticks into TM
  repeat until the mouseclick
    if (the ticks - TM) > 20 then
      -- too much time has transpired, cancel the handler.
      -- or, alternatively, perform a single-click action.
      -- (vary the double-click response speed by changing the "20"
      -- to another number, either higher or lower.)
      exit mouseup
    end if
  end repeat
  -- if we get here, user has double clicked
  -- so, put double-click action here!
end mouseup

Just attach this to the object you wish to check, and add the code to 
perform whatever actions you desire.  One nice side benefit is that you 
can make a single click perform one action (for instance, display a menu), 
and a double click another (go directly to some card).

If anyone has a more elegant solution (quicker? shorter?), I'd love to see 
it!

rob