Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!jdevoto
From: jdevoto@Apple.COM (Jeanne A. E. DeVoto)
Newsgroups: comp.sys.mac.hypercard
Subject: Re: HyperCard, Insertion Point, Scripts etc.
Message-ID: <46195@apple.Apple.COM>
Date: 1 Nov 90 04:50:30 GMT
References: <1125@wcc.oz>
Organization: Apple Computer Inc., Cupertino, CA
Lines: 52

[Mail went "boing!".]
In article <1125@wcc.oz> tom@wcc.oz (Tom Evans) writes:
[that he wants to know how to preserve the location of the insertion
point when a button is hilited.]

The workaround is to check and restore the selection after you hilite
the button. An example:

  on idle
    get the selectedChunk   -- store the insertion point location
    set the hilite of card button "Reminder" to true
    wait 10 ticks
    set the hilite of card button "Reminder" to false
    select it              -- restore the insertion point 
  end idle

This puts the insertion point back where it belongs after you're
finished hiliting.

Actually, the most common problem of this type is seen when a user
clicks an autohiliting button. A solution for this more common case
is

  on mouseDown   -- in button's script
    put the selectedChunk in to mySelection
    repeat while the mouse is down  -- emulate autohiliting behavior
      if the mouseLoc is within the rect of the target then
        set the hilite of the target to true
      else
        set the hilite of the target to false
      end if
    end repeat
    if the mouseLoc is within the rect of the target then
      -- mouse was released within the button
      -- do whatever you want to do on a button press
      -- this may include doing something to mySelection, such
      -- as boldfacing it, etc.
    end if
    select mySelection
  end mouseDown

This handler can also be used to make other types of button hiliting
-- for instance, changing the icon or button style rather than the
hilite to show that a button is being clicked -- behave like autohiliting,
with the state changing as you move the mouse on or off the button.
-- 
========= jeanne a. e. devoto ========================================
 jdevoto@apple.com     |  You may not distribute this article under a
 jdevoto@well.sf.ca.us |  compilation copyright without my permission.
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