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Re: mouse.el patch for region tracking

From: JD Smith
Subject: Re: mouse.el patch for region tracking
Date: Sat, 31 Dec 2005 12:19:23 -0700

On Dec 31, 2005, at 8:13 AM, Chong Yidong wrote:

JD Smith <address@hidden> writes:

Recently I found that Emacs 22 breaks a simple usage of mouse-drag-
region for defining regions by mouse drag.  When transient-mark-mode
is set, mouse-drag-region under Emacs 21 would let you define a
region by dragging, and when the drag is released, it completes (at
which point you can operate on the region).  This is somewhat similar
to the XEmacs function 'mouse-track'.

You're not very clear about what exactly is broken.  Could you give a
recipe to reproduce the bug, whatever the bug is?

Sure, sorry. I'm not sure it can be classified as a bug, since the behavior I was using wasn't really documented, and the changes which "broke" it were actually improvements to mouse.el. Nonetheless, it's a useful capability which XEmacs has and which Emacs 22 doesn't (without the patch).


(defun do-drag (event)
  (interactive "e")
  (let ((transient-mark-mode t)) ; transient mark
    (message "DRAG STARTED")
    (mouse-drag-region event)
    (message "DRAG FINISHED")))

(global-set-key [(control shift down-mouse-2)] 'do-drag)

On shift-mouse-2-drag, under Emacs 21, this code would complete after the drag. With Emacs 22, this is no longer the case; you need another event, like a key press, to return. See this thread for more detail:


With the patch I submitted, I can do:

(defun do-drag (event)
  "Print value of variable at the mouse position, with `help'"
  (interactive "e")
  (message "DRAG STARTED")
  (mouse-drag-track event)
  (message "DRAG FINISHED"))

and it works as desired under Emacs 22 (I'd use this new function if bound, and fall back on the transient-mark-mode trick otherwise).


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