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+;;; mouse-copy.el -- one-click text copy and move
+
+;; Copyright (C) 1996 Free Software Foundation, Inc.
+
+;; Author: John Heidemann <johnh@ISI.EDU>
+;; Keywords: mouse
+
+;; This file is part of GNU Emacs.
+
+;; GNU Emacs is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation; either version 2, or (at your option)
+;; any later version.
+
+;; GNU Emacs is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with GNU Emacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Commentary:
+
+;;; What is ``mouse-copy.el''?
+;;;
+;;; It provides one-click text copy and move.  Rather than the
+;;; standard stroke-out-a-region (down-mouse-1, up-mouse-1) followed
+;;; by a yank (down-mouse-2, up-mouse-2 or C-y), you can now stroke
+;;; out a region and have it automatically pasted at the current
+;;; point.  You can also move text just as easily.  Although the
+;;; difference may not sound like much, it does make mousing text
+;;; around a lot easier, IMHO.
+;;;
+;;; If you like mouse-copy, you should also check out mouse-drag
+;;; for ``one-click scrolling''.
+;;;
+;;; To use mouse-copy, place the following in your .emacs file:
+;;;     (require 'mouse-copy)
+;;;     (global-set-key [M-down-mouse-1] 'mouse-drag-secondary-pasting)
+;;;     (global-set-key [M-S-down-mouse-1] 'mouse-drag-secondary-moving)
+;;;
+;;; (These definitions override the old binding of M-mouse-1 to
+;;; mouse-drag-secondary.  I find I don't use that command much so its
+;;; loss is not important, and it can be made up with a M-mouse-1
+;;; followed by a M-mouse-3.  I personally reserve M-mouse bindings
+;;; for my window manager and bind everything to C-mouse.)
+;;;
+;;;
+;;; History and related work:
+;;;
+;;; One-click copying and moving was inspired by lemacs-19.8.
+;;; Throw-scrolling was inspired by MacPaint's ``hand'' and by Tk's
+;;; mouse-2 scrolling.  The package mouse-scroll.el by Tom Wurgler
+;;; <twurgler@goodyear.com> is similar to mouse-drag-throw, but
+;;; doesn't pass clicks through.
+;;;
+;;; These functions have been tested in emacs version 19.30,
+;;; and this package has run in the past on 19.25-19.29.
+;;;
+;;; Originally mouse-copy was part of a larger package.
+;;; As of 11 July 96 the scrolling functions were split out
+;;; in preparation for incorporation into (the future) emacs-19.32.
+;;;
+;;;
+;;; Known Bugs:
+;;;
+;;; - Highlighting is sub-optimal under 19.29 and XFree86-3.1.1
+;;;   (see \\[mouse-copy-work-around-drag-bug] for details).
+;;; - mouse-drag-secondary-pasting and mouse-drag-secondary-moving
+;;;   require X11R5 (or better) and so fail under older versions
+;;;   of Open Windows (like that present in Solaris/x86 2.1).
+;;;
+;;;
+;;; Future plans:
+;;;
+;;; I read about the chording features of Plan-9's Acme environment at
+;;; <http://swifty.dap.csiro.au/%7Ecameron/wily/auug.html>.  I'd like
+;;; to incorporate some of these ideas into mouse-copy.  The only
+;;; lose is that this is not the current Emacs Way Of Doing Things, so
+;;; there would be a learning curve for existing emacs users.
+;;;
+;;;
+;;; Thanks:
+;;;
+;;; Thanks to Kai Grossjohann
+;;; <grossjoh@dusty.informatik.uni-dortmund.de> for reporting bugs, to
+;;; Tom Wurgler <twurgler@goodyear.com> for reporting bugs and
+;;; suggesting fixes, and to Joel Graber <jgraber@ti.com> for
+;;; prompting me to do drag-scrolling and for an initial
+;;; implementation of horizontal drag-scrolling.
+;;;
+;;;    -johnh, 11-Jul-96
+;;;
+;;;
+;;; Old changes, for reference:
+;;;
+;;; What's new with mouse-copy 2.22?
+;;;
+;;; - copy functions split out from mouse-extras.el
+;;; - support for emacs-19.{29,30,31} (no changes needed for the 31 port!)
+;;;
+;;;
+;;; What's new with mouse-extras 2.21?
+;;;
+;;; - support for emacs-19.{29,30}
+;;; - point now stays on the visible screen during horizontal scrolling
+;;;   (bug identified and fix suggested by Tom Wurgler <twurgler@goodyear.com>)
+;;; - better work-around for lost-mouse-events bug (supports double/triple
+;;;   clicks), see \\[mouse-extras-work-around-drag-bug] for details.
+;;; - work-around for lost-mouse-events bug now is OFF by default;
+;;;   enable it if you have problems
+;;;
+
+
+
+;;; Code:
+
+;;
+;; move/paste code
+;;
+
+(defvar mouse-copy-last-paste-start nil
+  "Internal to `mouse-drag-secondary-pasting'.")
+(defvar mouse-copy-last-paste-end nil
+  "Internal to `mouse-drag-secondary-pasting'.")
+
+(defvar mouse-copy-have-drag-bug nil
+  "Set to enable mouse-copy-work-around-drag-bug.
+See `mouse-copy-work-around-drag-bug' for details.")
+
+(defun mouse-copy-work-around-drag-bug (start-event end-event)
+  "Code to work around a bug in post-19.29 emacs:  it drops mouse-drag events.
+The problem occurs under XFree86-3.1.1 (X11R6pl11) but not under X11R5,
+and under post-19.29 but not early versions of emacs.
+
+19.29 and 19.30 seems to drop mouse drag events
+sometimes. (Reproducable under XFree86-3.1.1 (X11R6pl11) and
+XFree86-3.1.2 under Linux 1.2.x.  Doesn't occur under X11R5 and SunOS
+4.1.1.)
+
+To see if you have the problem:
+Disable this routine (with (setq mouse-copy-have-drag-bug nil))..
+Click and drag for a while.
+If highlighting stops tracking, you have the bug.
+If you have the bug (or the real fix :-), please let me know."
+
+  ;; To work-around, call mouse-set-secondary with a fake
+  ;; drag event to set the overlay,
+  ;; the load the x-selection.
+  (save-excursion
+    (let*
+        ((start-posn (event-start start-event))
+         (end-posn (event-end end-event))
+         (end-buffer (window-buffer (posn-window end-posn)))
+         ;; First, figure out the region (left as point/mark).
+         (range (progn
+                  (set-buffer end-buffer)
+                  (mouse-start-end (posn-point start-posn)
+                                 (posn-point end-posn)
+                                 (1- (event-click-count start-event)))))
+         (beg (car range))
+         (end (car (cdr range))))
+      ;; Second, set the overlay.
+      (if mouse-secondary-overlay
+          (move-overlay mouse-secondary-overlay beg end)
+        (setq mouse-secondary-overlay (make-overlay beg (posn-point end))))
+      (overlay-put mouse-secondary-overlay 'face 'secondary-selection)
+      ;; Third, set the selection.
+      ;; (setq me-beg beg me-end end me-range range)  ; for debugging
+      (set-buffer end-buffer)
+      (x-set-selection 'SECONDARY (buffer-substring beg end)))))
+
+    
+(defun mouse-drag-secondary-pasting (start-event)
+  "Drag out a secondary selection, then paste it at the current point.
+
+To test this function, evaluate:
+        (global-set-key [M-down-mouse-1] 'mouse-drag-secondary-pasting)
+put the point at one place, then click and drag over some other region."
+  (interactive "e")
+  ;; Work-around: We see and react to each part of a multi-click event
+  ;; as it proceeds.  For a triple-event, this means the double-event
+  ;; has already copied something that the triple-event will re-copy
+  ;; (a Bad Thing).  We therefore undo the prior insertion if we're on
+  ;; a multiple event.
+  (if (and mouse-copy-last-paste-start
+           (>= (event-click-count start-event) 2))
+      (delete-region mouse-copy-last-paste-start
+                     mouse-copy-last-paste-end))
+
+  ;; HACK: We assume that mouse-drag-secondary returns nil if
+  ;; there's no secondary selection.  This assumption holds as of
+  ;; emacs-19.22 but is not documented.  It's not clear that there's
+  ;; any other way to get this information.
+  (if (mouse-drag-secondary start-event)
+      (progn
+        (if mouse-copy-have-drag-bug
+            (mouse-copy-work-around-drag-bug start-event last-input-event))
+        ;; Remember what we do so we can undo it, if necessary.
+        (setq mouse-copy-last-paste-start (point))
+        (insert (x-get-selection 'SECONDARY))
+        (setq mouse-copy-last-paste-end (point)))
+    (setq mouse-copy-last-paste-start nil)))
+  
+
+(defun mouse-kill-preserving-secondary ()
+  "Kill the text in the secondary selection, but leave the selection set.
+
+This command is like \\[mouse-kill-secondary] (that is, the secondary
+selection is deleted and placed in the kill ring), except that it also
+leaves the secondary buffer active on exit.
+
+This command was derived from mouse-kill-secondary in emacs-19.28
+by johnh@ficus.cs.ucla.edu."
+  (interactive)
+  (let* ((keys (this-command-keys))
+         (click (elt keys (1- (length keys)))))
+    (or (eq (overlay-buffer mouse-secondary-overlay)
+            (if (listp click)
+                (window-buffer (posn-window (event-start click)))
+              (current-buffer)))
+        (error "Select or click on the buffer where the secondary selection is")))
+  (save-excursion
+    (set-buffer (overlay-buffer mouse-secondary-overlay))
+    (kill-region (overlay-start mouse-secondary-overlay)
+                 (overlay-end mouse-secondary-overlay)))
+  ;; (delete-overlay mouse-secondary-overlay)
+  ;; (x-set-selection 'SECONDARY nil)
+  ;; (setq mouse-secondary-overlay nil)
+)
+
+(defun mouse-drag-secondary-moving (start-event)
+  "Sweep out a secondary selection, then move it to the current point."
+  (interactive "e")
+  ;; HACK:  We assume that mouse-drag-secondary returns nil if
+  ;; there's no secondary selection.  This works as of emacs-19.22.
+  ;; It's not clear that there's any other way to get this information.
+  (if (mouse-drag-secondary start-event)
+      (progn
+        (mouse-kill-preserving-secondary)
+        (insert (x-get-selection 'SECONDARY))))
+)
+
+(provide 'mouse-copy)
+
+;;; mouse-copy.el ends here