Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!wuarchive!psuvax1!psuvm!cunyvm!byuvax!taylorj
From: taylorj@yvax.byu.edu
Newsgroups: comp.sys.mac.hypercard
Subject: Selecting text (or "ClickLine version 5.1")
Message-ID: <866taylorj@yvax.byu.edu>
Date: 23 Oct 89 05:06:58 GMT
Lines: 38


In somebody's response to somebody else's question about selecting text in a
locked field, a formula was given to figure out which line of the field was
clicked on.  This prompted me to offer up the following for public consumption.

A while ago there was a "clickLine" function that floated around (various
incarnations have appeared as "clickedLine", "lineNumber" and so on).  This
function had a bug in it and was quickly replaced by a corrected version.  Then
a new improved "universal" version appeared in the Developer's Stack which
accounted for scrolling fields.  I improved it yet again to handle fields with
wide margins.

So if you want a handy little function to tell you which line of a field was
clicked on, here's the best one I know of:

-- Returns the number of the line clicked on in the target field
-- Accounts for scrolling fields and wide margins
function clickLine
  put the clickV - the top of the target into lineV
  if the style of the target = "scrolling"
  then add the scroll of the target to lineV
  if the wideMargins of the target then subtract 4 from lineV
  return lineV div the textHeight of the target + 1
end clickLine

Here's an example of how to use it in the script of a locked field:

-- Select the line that was clicked on
on mouseUp
  select line clickLine of me
end mouseUp


If anyone has any additions or improvements to this script, please pass them
on.


Jim Taylor
Microcomputer Support for Curriculum   |
Brigham Young University               |   Bitnet: taylorj@byuvax.bitnet
101 HRCB, Provo, UT  84602             |   Internet: taylorj@yvax.byu.edu