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Re: How to programmatically highlight region?

From: Perry Smith
Subject: Re: How to programmatically highlight region?
Date: Wed, 15 Nov 2006 18:50:22 -0600

On Nov 15, 2006, at 4:48 PM, David Abrahams wrote:

Perry Smith <address@hidden> writes:

On Nov 15, 2006, at 2:10 PM, David Abrahams wrote:


    Could someone tell me how to get the effect of an "activated mark" in
    transient mark mode from within elisp?  In other words, I'd like to be
    able to set up the point and mark, and when my elisp completes, see
    the region highlighted.  Seems like it should be simple, but nothing I
    do seems to work.

You might be asking how transient mark mode works.  

I don't think that's what I'm asking.

It seems to be just a variable that commands look at.  But this
works for me:

(defun dog-test ()
 (transient-mark-mode 1)
 (set-mark (point))
 (forward-char 20))

execute dog-test from the minibuffer and the current point plus 20
characters are highlighted

Not for me. :(

Thanks for responding.

I felt challenged :-)

You make a face.  Put the attributes that you want in it.  Then use put-text-property to apply that face to the region.

(make-face 'my-blue-face)

(set-face-attribute 'my-blue-face nil :background "blue")

(defun dog-test3 ()
  (put-text-property (point) (mark) 'face 'my-blue-face))

Set your mark and point, then do M-x dog-test3

There is something I don't understand though.  If you have font-lock-mode set, then it does not work.  I'm not sure what is happening in that case.  I'm curious to see if others reply.

Hope this help...
Perry Smith
Ease Software, Inc.

Low cost SATA Disk Systems for IBMs p5, pSeries, and RS/6000 AIX systems

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