--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/lisp/mouse.el	Mon Aug 13 11:28:15 2007 +0200
@@ -0,0 +1,1573 @@
+;;; mouse.el --- window system-independent mouse support.
+
+;; Copyright (C) 1988, 1992-4, 1997 Free Software Foundation, Inc.
+;; Copyright (C) 1995 Tinker Systems
+;; Copyright (C) 1995, 1996 Ben Wing.
+
+;; Maintainer: XEmacs Development Team
+;; Keywords: mouse, dumped
+
+;; This file is part of XEmacs.
+
+;; XEmacs 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.
+
+;; XEmacs 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 XEmacs; see the file COPYING.  If not, write to the
+;; Free Software Foundation, 59 Temple Place - Suite 330,
+;; Boston, MA 02111-1307, USA.
+
+;;; Synched up with: Not synched with FSF.  Almost completely divergent.
+
+;;; Commentary:
+
+;; This file is dumped with XEmacs (when window system support is compiled in).
+
+;;; Code:
+
+(provide 'mouse)
+
+(global-set-key 'button1 'mouse-track)
+(global-set-key '(shift button1) 'mouse-track-adjust)
+(global-set-key '(control button1) 'mouse-track-insert)
+(global-set-key '(control shift button1) 'mouse-track-delete-and-insert)
+(global-set-key '(meta button1) 'mouse-track-do-rectangle)
+
+;; drops are now handled in dragdrop.el (ograf@fga.de)
+
+;; enable drag regions (ograf@fga.de)
+;; if button2 is dragged from within a region, this becomes a drop
+;;
+;; this must be changed to the new api
+(if (featurep '(or offix cde mswindows))
+    (global-set-key 'button2 'mouse-drag-or-yank)
+  (global-set-key 'button2 'mouse-yank))
+
+(defgroup mouse nil
+  "Window system-independent mouse support."
+  :group 'editing)
+
+(defcustom mouse-track-rectangle-p nil
+  "*If true, then dragging out a region with the mouse selects rectangles
+instead of simple start/end regions."
+  :type 'boolean
+  :group 'mouse)
+
+(defcustom mouse-yank-at-point nil
+  "*If non-nil, the function `mouse-yank' will yank text at the cursor location.
+Otherwise, the cursor will be moved to the location of the pointer click before
+text is inserted."
+  :type 'boolean
+  :group 'mouse)
+
+(defcustom mouse-highlight-text 'context
+  "*Choose the default double-click highlighting behavior.
+If set to `context', double-click will highlight words when the mouse
+ is at a word character, or a symbol if the mouse is at a symbol
+ character.
+If set to `word', double-click will always attempt to highlight a word.
+If set to `symbol', double-click will always attempt to highlight a
+ symbol (the default behavior in previous XEmacs versions)."
+  :type '(choice (const context)
+		 (const word)
+		 (const symbol))
+  :group 'mouse)
+
+(defvar mouse-yank-function 'mouse-consolidated-yank
+  "Function that is called upon by `mouse-yank' to actually insert text.")
+
+(defun mouse-consolidated-yank ()
+  "Insert the current selection or, if there is none under X insert
+the X cutbuffer.  A mark is pushed, so that the inserted text lies
+between point and mark."
+  (interactive)
+  (if (and (not (console-on-window-system-p))
+	   (and (featurep 'gpm)
+		(not gpm-minor-mode)))
+      (yank)
+    (push-mark)
+    (if (region-active-p)
+	(if (consp zmacs-region-extent)
+	    ;; pirated code from insert-rectangle in rect.el
+	    ;; perhaps that code should be modified to handle a list of extents
+	    ;; as the rectangle to be inserted?
+	    (let ((lines zmacs-region-extent)
+		  (insertcolumn (current-column))
+		  (first t))
+	      (push-mark)
+	      (while lines
+		(or first
+		    (progn
+		      (forward-line 1)
+		      (or (bolp) (insert ?\n))
+		      (move-to-column insertcolumn t)))
+		(setq first nil)
+		(insert (extent-string (car lines)))
+		(setq lines (cdr lines))))
+	  (insert (extent-string zmacs-region-extent)))
+      (insert-selection t))))
+
+(defun insert-selection (&optional check-cutbuffer-p move-point-event)
+  "Insert the current selection into buffer at point."
+  (interactive "P")
+  ;; we fallback to the clipboard if the current selection is not existent
+  (let ((text (if check-cutbuffer-p
+		  (or (get-selection-no-error) 
+		      (get-cutbuffer)
+		      (get-selection-no-error 'CLIPBOARD)
+		      (error "No selection, clipboard or cut buffer available"))
+		(or (get-selection-no-error)
+		    (get-selection 'CLIPBOARD)))))
+    (cond (move-point-event
+	   (mouse-set-point move-point-event)
+	   (push-mark (point)))
+	  ((interactive-p)
+	   (push-mark (point))))
+    (insert text)
+    ))
+
+
+(defun mouse-select ()
+  "Select Emacs window the mouse is on."
+  (interactive "@"))
+
+(defun mouse-delete-window ()
+  "Delete the Emacs window the mouse is on."
+  (interactive "@")
+  (delete-window))
+
+(defun mouse-keep-one-window ()
+  "Select Emacs window mouse is on, then kill all other Emacs windows."
+  (interactive "@")
+  (delete-other-windows))
+
+(defun mouse-select-and-split ()
+  "Select Emacs window mouse is on, then split it vertically in half."
+  (interactive "@")
+  (split-window-vertically nil))
+
+(defun mouse-set-point (event)
+  "Select Emacs window mouse is on, and move point to mouse position."
+  (interactive "@e")
+  (let ((window (event-window event))
+	(pos (event-point event))
+	(close-pos (event-closest-point event)))
+    (or window (error "not in a window"))
+    (select-window window)
+    (if (and pos (> pos 0))
+	;; If the event was over a text char, it's easy.
+	(goto-char (max (min pos (point-max)) (point-min)))
+      (if (and close-pos (> close-pos 0))
+	  (goto-char (max (min close-pos (point-max)) (point-min)))
+	;; When the event occurs outside of the frame directly to the
+	;; left or right of a modeline, close-point is nil, but
+	;; event-over-modeline is also nil.  That will drop us to this
+	;; point.  So instead of erroring, just return nil.
+	nil))))
+
+(defun mouse-yank (event)
+  "Paste text with the mouse.
+If the variable `mouse-yank-at-point' is nil, then pasting occurs at the
+location of the click; otherwise, pasting occurs at the current cursor
+location."
+  (interactive "e")
+  (and (not mouse-yank-at-point)
+       (mouse-set-point event))
+  (funcall mouse-yank-function))
+
+(defun click-inside-extent-p (click extent)
+  "Return non-nil if the button event is within the primary selection-extent.
+Return nil otherwise."
+  ;; stig@hackvan.com
+  (let ((ewin (event-window click))
+	(epnt (event-point click)))
+    (and ewin
+	 epnt
+	 extent
+	 (eq (window-buffer ewin)
+	     (extent-object extent))
+	 (extent-start-position extent)
+	 (> epnt (extent-start-position extent))
+	 (> (extent-end-position extent) epnt))))
+
+(defun click-inside-selection-p (click)
+  (or (click-inside-extent-p click primary-selection-extent)
+      (click-inside-extent-p click zmacs-region-extent)
+      ))
+
+(defun point-inside-extent-p (extent)
+  "Return t if point is within the bounds of the primary selection extent.
+Return t is point is at the end position of the extent.
+Return nil otherwise."
+  ;; stig@hackvan.com
+  (and extent
+       (eq (current-buffer)
+	   (extent-object extent))
+       (> (point) (extent-start-position extent))
+       (>= (extent-end-position extent) (point))))
+
+(defun point-inside-selection-p ()
+  ;; by Stig@hackvan.com
+  (or (point-inside-extent-p primary-selection-extent)
+      (point-inside-extent-p zmacs-region-extent)))
+
+(defun mouse-drag-or-yank (event)
+  "Either drag or paste the current selection.
+If the variable `mouse-yank-at-point' is non-nil,
+move the cursor to the location of the click before pasting.
+This functions has to be improved.  Currently it is just a (working) test."
+  ;; by Oliver Graf <ograf@fga.de>
+  (interactive "e")
+  (if (click-inside-extent-p event zmacs-region-extent)
+      ;; okay, this is a drag
+      (cond ((featurep 'offix)
+	     (offix-start-drag-region 
+	      event
+	      (extent-start-position zmacs-region-extent)
+	      (extent-end-position zmacs-region-extent)))
+	    ((featurep 'cde)
+	     ;; should also work with CDE
+	     (cde-start-drag-region event
+				    (extent-start-position zmacs-region-extent)
+				    (extent-end-position zmacs-region-extent)))
+	    (t (error "No offix or CDE support compiled in")))
+    ;; no drag, call region-funct
+    (and (not mouse-yank-at-point)
+	 (mouse-set-point event))
+    (funcall mouse-yank-function))
+  )
+
+(defun mouse-eval-sexp (click force-window)
+  "Evaluate the sexp under the mouse.  Usually, this is the last sexp before
+the click, but if you click on a left paren, then it is the sexp beginning
+with the paren that is evaluated.  Also, since strings evaluate to themselves,
+they're fed to re-search-forward and the matched region is highlighted until
+the mouse button is released.
+
+Perhaps the most useful thing about this function is that the evaluation of
+the expression which is clicked upon is relative not to the window where you
+click, but to the current window and the current position of point.  Thus,
+you can use `mouse-eval-sexp' to interactively test code that acts upon a
+buffer...something you cannot do with the standard `eval-last-sexp' function.
+It's also fantastic for debugging regular expressions."
+  ;; by Stig@hackvan.com
+  (interactive "e\nP")
+  (let (exp val result-str)
+    (setq exp (save-window-excursion
+		(save-excursion
+		  (mouse-set-point click)
+		  (save-excursion
+		    (or (looking-at "(") (forward-sexp -1))
+		    (read (point-marker))))))
+    (cond ((stringp exp)
+	   (if (setq val (re-search-forward exp nil t))
+	       (let* ((oo (make-extent (match-beginning 0) (match-end 0))))
+		 (set-extent-face oo 'highlight)
+		 (set-extent-priority oo 1000)
+		 ;; wait for button release...
+		 (setq unread-command-event (next-command-event))
+		 (delete-extent oo))
+	     (message "Regex \"%s\" not found" exp)
+	     (ding nil 'quiet)))
+	  (t (setq val (if (fboundp 'eval-interactive)
+			   (eval-interactive exp)
+			 (eval exp)))))
+    (setq result-str (prin1-to-string val))
+    ;; #### -- need better test
+    (if (and (not force-window)
+	     (<= (length result-str) (window-width (selected-window))))
+	(message "%s" result-str)
+      (with-output-to-temp-buffer "*Mouse-Eval*"
+	(condition-case nil
+	    (pprint val)
+	  (error (prin1 val))))
+      )))
+
+(defun mouse-line-length (event)
+  "Print the length of the line indicated by the pointer."
+  (interactive "@e")
+  (save-excursion
+    (mouse-set-point event)
+    (message "Line length: %d" (- (point-at-eol) (point-at-bol))))
+  (sleep-for 1))
+
+(defun mouse-set-mark (event)
+  "Select Emacs window mouse is on, and set mark at mouse position.
+Display cursor at that position for a second."
+  (interactive "@e")
+  (let ((point-save (point)))
+    (unwind-protect
+	(progn (mouse-set-point event)
+	       (push-mark nil t)
+	       (sit-for 1))
+      (goto-char point-save))))
+
+(defun mouse-scroll (event)
+  "Scroll point to the mouse position."
+  (interactive "@e")
+  (save-excursion
+    (mouse-set-point event)
+    (recenter 0)
+    (scroll-right (event-x event))))
+
+(defun mouse-del-char (event)
+  "Delete the char pointed to by the mouse."
+  (interactive "@e")
+  (save-excursion
+    (mouse-set-point event)
+    (delete-char 1 nil)))
+
+(defun mouse-kill-line (event)
+  "Kill the line pointed to by the mouse."
+  (interactive "@e")
+  (save-excursion
+    (mouse-set-point event)
+    (kill-line nil)))
+
+(defun mouse-bury-buffer (event)
+  "Bury the buffer pointed to by the mouse, thus selecting the next one."
+  (interactive "e")
+  (save-selected-window
+    (select-window (event-window event))
+    (bury-buffer)))
+
+(defun mouse-unbury-buffer (event)
+  "Unbury and select the most recently buried buffer."
+  (interactive "e")
+  (save-selected-window
+    (select-window (event-window event))
+    (let* ((bufs (buffer-list))
+	   (entry (1- (length bufs)))
+	   val)
+      (while (not (setq val (nth entry bufs)
+			val (and (/= (aref (buffer-name val) 0)
+				     ? )
+				 val)))
+	(setq entry (1- entry)))
+      (switch-to-buffer val))))
+
+(defun narrow-window-to-region (m n)
+  "Narrow window to region between point and last mark"
+  (interactive "r")
+  (save-excursion
+    (save-restriction
+      (if (eq (selected-window) (next-window))
+	  (split-window))
+      (goto-char m)
+      (recenter 0)
+      (if (eq (selected-window)
+	      (if (zerop (minibuffer-depth))
+		  (next-window)))
+	  ()
+	(shrink-window (- (- (window-height) (count-lines m n)) 1))))))
+
+(defun mouse-window-to-region (event)
+  "Narrow window to region between cursor and mouse pointer."
+  (interactive "@e")
+  (let ((point-save (point)))
+    (unwind-protect
+	(progn (mouse-set-point event)
+	       (push-mark nil t)
+	       (sit-for 1))
+      (goto-char point-save)
+      (narrow-window-to-region (region-beginning) (region-end)))))
+
+(defun mouse-ignore ()
+  "Don't do anything."
+  (interactive))
+
+
+;;; mouse/selection tracking
+;;; generalized mouse-track
+
+(defvar default-mouse-track-normalize-point-function
+  'default-mouse-track-normalize-point
+  "Function called to normalize position of point.
+Called with two arguments: TYPE depends on the number of times that the
+mouse has been clicked and is a member of `default-mouse-track-type-list',
+FORWARDP determines the direction in which the point should be moved.")
+
+(defvar mouse-track-down-hook nil
+  "Function or functions called when the user presses the mouse.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding.  The functions will be
+called with two arguments: the button-press event and a click
+count (see `mouse-track-click-hook').
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+Note that most applications should take action when the mouse is
+released, not when it is pressed.'")
+
+(defvar mouse-track-drag-hook nil
+  "Function or functions called when the user drags the mouse.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding.  The functions will be
+called with three arguments: the mouse-motion event, a click
+count (see `mouse-track-click-hook'), and whether the call to
+this hook occurred as a result of a drag timeout (see
+`mouse-track-scroll-delay').
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+Note that no calls to this function will be made until the user
+initiates a drag (i.e. moves the mouse more than a certain
+threshold in either the X or the Y direction, as defined by
+`mouse-track-x-threshold' and `mouse-track-y-threshold').
+
+See also `mouse-track-drag-up-hook'.")
+
+(defvar mouse-track-drag-up-hook nil
+  "Function or functions called when the user finishes a drag.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding.  The functions will be
+called with two arguments: the button-press event and a click
+count (see `mouse-track-click-hook').
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+Note that this hook will not be invoked unless the user has
+initiated a drag, i.e. moved the mouse more than a certain threshold
+(see `mouse-track-drag-hook').  When this function is invoked,
+`mouse-track-drag-hook' will have been invoked at least once.
+
+See also `mouse-track-click-hook'.")
+
+(defvar mouse-track-click-hook nil
+  "Function or functions called when the user clicks the mouse.
+`Clicking' means pressing and releasing the mouse without having
+initiated a drag (i.e. without having moved more than a certain
+threshold -- see `mouse-track-drag-hook').
+
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding.  The functions will be
+called with two arguments: the button-release event and a click
+count, which specifies the number of times that the mouse has been
+clicked in a series of clicks, each of which is separated by at most
+`mouse-track-multi-click-time'.  This can be used to implement actions
+that are called on double clicks, triple clicks, etc.
+
+If any function returns non-nil, the remaining functions will not be
+called.
+
+See also `mouse-track-drag-up-hook.")
+
+(defvar mouse-track-up-hook nil
+  "Function or functions called when the user releases the mouse.
+This hook is invoked by `mouse-track'; thus, it will not be called
+for any buttons with a different binding.  The functions will be
+called with two arguments: the button-release event and a click
+count (see `mouse-track-click-hook').
+
+For many applications, it is more appropriate to use one or both
+of `mouse-track-click-hook' and `mouse-track-drag-up-hook'.")
+
+(defvar mouse-track-cleanup-hook nil
+  "Function or functions called when `mouse-track' terminates.
+This hook will be called in all circumstances, even upon a
+non-local exit out of `mouse-track', and so is useful for
+doing cleanup work such as removing extents that may have
+been created during the operation of `mouse-track'.
+
+Unlike all of the other mouse-track hooks, this is a \"normal\"
+hook: the hook functions are called with no arguments, and
+all hook functions are called regardless of their return
+values.")
+
+(defcustom mouse-track-multi-click-time 400
+  "*Maximum number of milliseconds allowed between clicks for a multi-click.
+See `mouse-track-click-hook'."
+  :type 'integer
+  :group 'mouse)
+
+(defcustom mouse-track-scroll-delay 100
+  "Maximum of milliseconds between calls to `mouse-track-drag-hook'.
+If the user is dragging the mouse (i.e. the button is held down and
+a drag has been initiated) and does not move the mouse for this many
+milliseconds, the hook will be called with t as the value of the
+WAS-TIMEOUT parameter.  This can be used to implement scrolling
+in a selection when the user drags the mouse out the window it
+was in.
+
+A value of nil disables the timeout feature."
+  :type '(choice integer (const :tag "Disabled" nil))
+  :group 'mouse)
+
+(defvar mouse-track-x-threshold '(face-width 'default)
+  "Minimum number of pixels in the X direction for a drag to be initiated.
+If the mouse is moved more than either the X or Y threshold while the
+button is held down (see also `mouse-track-y-threshold'), then a drag
+is initiated; otherwise the gesture is considered to be a click.
+See `mouse-track'.
+
+The value should be either a number of a form to be evaluated to
+produce a number.")
+
+(defvar mouse-track-y-threshold '(face-height 'default)
+  "Minimum number of pixels in the Y direction for a drag to be initiated.
+If the mouse is moved more than either the X or Y threshold while the
+button is held down (see also `mouse-track-x-threshold'), then a drag
+is initiated; otherwise the gesture is considered to be a click.
+See `mouse-track'.
+
+The value should be either a number of a form to be evaluated to
+produce a number.")
+
+;; these variables are private to mouse-track.
+(defvar mouse-track-up-time nil)
+(defvar mouse-track-up-x nil)
+(defvar mouse-track-up-y nil)
+(defvar mouse-track-timeout-id nil)
+(defvar mouse-track-click-count nil)
+
+(defun mouse-track-set-timeout (event)
+  (if mouse-track-timeout-id
+      (disable-timeout mouse-track-timeout-id))
+  (if mouse-track-scroll-delay
+      (setq mouse-track-timeout-id
+	    (add-timeout (/ mouse-track-scroll-delay 1000.0)
+			 'mouse-track-scroll-undefined
+			 (copy-event event)))))
+
+(defun mouse-track-run-hook (hook event &rest args)
+  ;; ugh, can't use run-hook-with-args-until-success because we have
+  ;; to get the value using symbol-value-in-buffer.  Doing a
+  ;; save-excursion/set-buffer is wrong because the hook might want to
+  ;; change the buffer, but just doing a set-buffer is wrong because
+  ;; the hook might not want to change the buffer.
+  ;; #### What we need here is a Lisp interface to
+  ;; run_hook_with_args_in_buffer.  Here is a poor man's version.
+  (let ((buffer (event-buffer event)))
+    (and mouse-grabbed-buffer (setq buffer mouse-grabbed-buffer))
+    (when buffer
+      (let ((value (symbol-value-in-buffer hook buffer nil)))
+	(if (and (listp value) (not (eq (car value) 'lambda)))
+	    ;; List of functions.
+	    (let (retval)
+	      (while (and value (null retval))
+		;; Found `t': should process default value.  We could
+		;; splice it into the buffer-local value, but that
+		;; would cons, which is not a good thing for
+		;; mouse-track hooks.
+		(if (eq (car value) t)
+		    (let ((global (default-value hook)))
+		      (if (and (listp global) (not (eq (car global) 'lambda)))
+			  ;; List of functions.
+			  (while (and global
+				      (null (setq retval
+						  (apply (car global) event args))))
+			    (pop global))
+			;; lambda
+			(setq retval (apply (car global) event args))))
+		  (setq retval (apply (car value) event args)))
+		(pop value))
+	      retval)
+	  ;; lambda
+	  (apply value event args))))))
+
+(defun mouse-track-scroll-undefined (random)
+  ;; the old implementation didn't actually define this function,
+  ;; and in normal use it won't ever be called because the timeout
+  ;; will either be removed before it fires or will be picked off
+  ;; with next-event and not dispatched.  However, if you're
+  ;; attempting to debug a click-hook (which is pretty damn
+  ;; difficult to do), this function may get called.
+)
+
+(defun mouse-track (event)
+  "Make a selection with the mouse.  This should be bound to a mouse button.
+The behavior of XEmacs during mouse selection is customizable using various
+hooks and variables: see `mouse-track-click-hook', `mouse-track-drag-hook',
+`mouse-track-drag-up-hook', `mouse-track-down-hook', `mouse-track-up-hook',
+`mouse-track-cleanup-hook', `mouse-track-multi-click-time',
+`mouse-track-scroll-delay', `mouse-track-x-threshold', and
+`mouse-track-y-threshold'.
+
+Default handlers are provided to implement standard selecting/positioning
+behavior.  You can explicitly request this default behavior, and override
+any custom-supplied handlers, by using the function `mouse-track-default'
+instead of `mouse-track'.
+
+Default behavior is as follows:
+
+If you click-and-drag, the selection will be set to the region between the
+point of the initial click and the point at which you release the button.
+These positions need not be ordered.
+
+If you click-and-release without moving the mouse, then the point is moved
+and the selection is disowned (there will be no selection owner).  The mark
+will be set to the previous position of point.
+
+If you double-click, the selection will extend by symbols instead of by
+characters.  If you triple-click, the selection will extend by lines.
+
+If you drag the mouse off the top or bottom of the window, you can select
+pieces of text which are larger than the visible part of the buffer; the
+buffer will scroll as necessary.
+
+The selected text becomes the current X Selection.  The point will be left
+at the position at which you released the button, and the mark will be left
+at the initial click position."
+  (interactive "e")
+  (let ((mouse-down t)
+	(xthresh (eval mouse-track-x-threshold))
+	(ythresh (eval mouse-track-y-threshold))
+	(orig-x (event-x-pixel event))
+	(orig-y (event-y-pixel event))
+	(buffer (event-buffer event))
+	(mouse-grabbed-buffer (event-buffer event))
+	mouse-moved)
+    (if (or (not mouse-track-up-x)
+	    (not mouse-track-up-y)
+	    (not mouse-track-up-time)
+	    (> (- (event-timestamp event) mouse-track-up-time)
+	       mouse-track-multi-click-time)
+	    (> (abs (- mouse-track-up-x orig-x)) xthresh)
+	    (> (abs (- mouse-track-up-y orig-y)) ythresh))
+	(setq mouse-track-click-count 1)
+      (setq mouse-track-click-count (1+ mouse-track-click-count)))
+    (if (not (event-window event))
+	(error "Not over a window."))
+    (mouse-track-run-hook 'mouse-track-down-hook
+			  event mouse-track-click-count)
+    (unwind-protect
+	(while mouse-down
+	  (setq event (next-event event))
+	  (cond ((motion-event-p event)
+		 (if (and (not mouse-moved)
+			  (or (> (abs (- (event-x-pixel event) orig-x))
+				 xthresh)
+			      (> (abs (- (event-y-pixel event) orig-y))
+				 ythresh)))
+		     (setq mouse-moved t))
+		 (if mouse-moved
+		     (mouse-track-run-hook 'mouse-track-drag-hook
+		      event mouse-track-click-count nil))
+		 (mouse-track-set-timeout event))
+		((and (timeout-event-p event)
+		      (eq (event-function event)
+			  'mouse-track-scroll-undefined))
+		 (if mouse-moved
+		     (mouse-track-run-hook 'mouse-track-drag-hook
+		      (event-object event) mouse-track-click-count t))
+		 (mouse-track-set-timeout (event-object event)))
+		((button-release-event-p event)
+		 (setq mouse-track-up-time (event-timestamp event))
+		 (setq mouse-track-up-x (event-x-pixel event))
+		 (setq mouse-track-up-y (event-y-pixel event))
+		 (setq mouse-down nil)
+		 (mouse-track-run-hook 'mouse-track-up-hook
+		  event mouse-track-click-count)
+		 (if mouse-moved
+		     (mouse-track-run-hook 'mouse-track-drag-up-hook
+		      event mouse-track-click-count)
+		   (mouse-track-run-hook 'mouse-track-click-hook
+		    event mouse-track-click-count)))
+		((or (key-press-event-p event)
+		     (and (misc-user-event-p event)
+			  (eq (event-function event) 'cancel-mode-internal)))
+		 (error "Selection aborted"))
+		(t
+		 (dispatch-event event))))
+      ;; protected
+      (if mouse-track-timeout-id
+	  (disable-timeout mouse-track-timeout-id))
+      (setq mouse-track-timeout-id nil)
+      (and buffer
+	   (save-excursion
+	     (set-buffer buffer)
+	     (run-hooks 'mouse-track-cleanup-hook))))))
+
+
+;;;;;;;;;;;; default handlers: new version of mouse-track
+
+(defvar default-mouse-track-type nil)
+(defvar default-mouse-track-type-list '(char word line))
+(defvar default-mouse-track-window nil)
+(defvar default-mouse-track-extent nil)
+(defvar default-mouse-track-adjust nil)
+(defvar default-mouse-track-min-anchor nil)
+(defvar default-mouse-track-max-anchor nil)
+(defvar default-mouse-track-result nil)
+(defvar default-mouse-track-down-event nil)
+
+;; D. Verna Feb. 17 1998
+;; This function used to assume that when (event-window event) differs from
+;; window, we have to scroll. This is WRONG, for instance when there are
+;; toolbars on the side, in which case window-event returns nil.
+(defun default-mouse-track-set-point-in-window (event window)
+  (if (event-over-modeline-p event)
+      nil ;; Scroll
+    ;; Not over a modeline
+    (if (eq (event-window event) window)
+	(let ((p (event-closest-point event)))
+	  (if  (or (not p) (not (pos-visible-in-window-p p window)))
+	      nil ;; Scroll
+	    (mouse-set-point event)
+	    t))
+      ;; Not over a modeline, not the same window. Check if the Y position
+      ;; is still overlapping the original window.
+      (let* ((edges (window-pixel-edges window))
+	     (row (event-y-pixel event))
+	     (text-start (nth 1 edges))
+	     (text-end (+ (nth 3 edges))))
+	(if (or (< row text-start)
+		(> row text-end))
+	    nil ;; Scroll
+	  ;; The Y pos in overlapping the original window. Check however if
+	  ;; the position is really visible, because there could be a
+	  ;; scrollbar or a modeline at this place.
+	  ;; Find the mean line height (height / lines nb), and approximate
+	  ;; the line number for Y pos.
+	  (select-window window)
+	  (let ((line (/ (* (- row text-start) (window-height))
+			 (- text-end text-start))))
+	    (if (not (save-excursion
+		       (goto-char (window-start))
+		       (pos-visible-in-window-p
+			(point-at-bol (+ 1 line)))))
+		nil ;; Scroll
+	      ;; OK, we can go to that position
+	      (goto-char (window-start))
+	      (forward-line line)
+	      ;; On the right side: go to end-of-line.
+	      (when (>= (event-x-pixel event) (nth 2 edges))
+		(goto-char (point-at-eol)))
+	      t))))
+      )))
+
+
+(defun default-mouse-track-scroll-and-set-point (event window)
+  (select-window window)
+  (let ((edges (window-pixel-edges window))
+	(row (event-y-pixel event))
+	(height (face-height 'default)))
+    (cond ((< (abs (- row (nth 1 edges))) (abs (- row (nth 3 edges))))
+	   ;; closer to window's top than to bottom, so move up
+	   (let ((delta (max 1 (/ (- (nth 1 edges) row) height))))
+	     (condition-case () (scroll-down delta) (error))
+	     (goto-char (window-start))))
+	  ((>= (point) (point-max)))
+	  (t
+	   ;; scroll by one line if over the modeline or a clipped line
+	   (let ((delta (if (or (event-over-modeline-p event)
+				(< row (nth 3 edges)))
+			    1
+			  (+ (/ (- row (nth 3 edges)) height) 1)))
+		 (close-pos (event-closest-point event)))
+	     (condition-case () (scroll-up delta) (error))
+	     (if (and close-pos (pos-visible-in-window-p close-pos))
+		 (goto-char close-pos)
+	       (goto-char (window-end))
+	       (vertical-motion delta)
+	       ;; window-end reports the end of the clipped line, even if
+	       ;; scroll-on-clipped-lines is t.  compensate.
+	       ;; (If window-end gets fixed this can be removed.)
+	       (if (not (pos-visible-in-window-p (max (1- (point))
+						      (point-min))))
+		   (vertical-motion -1))
+	       (condition-case () (backward-char 1)
+		 (error (end-of-line)))))))))
+
+
+;; This remembers the last position at which the user clicked, for the
+;; benefit of mouse-track-adjust (for example, button1; scroll until the
+;; position of the click is off the frame; then Sh-button1 to select the
+;; new region.
+(defvar default-mouse-track-previous-point nil)
+
+(defun default-mouse-track-set-point (event window)
+  (if (default-mouse-track-set-point-in-window event window)
+      nil
+    (default-mouse-track-scroll-and-set-point event window)))
+
+(defsubst default-mouse-track-beginning-of-word (symbolp)
+  (let ((word-constituent (cond ((eq symbolp t) "\\w\\|\\s_\\|\\s'")
+				((null symbolp) "\\w")
+				(t "[^ \t\n]")))
+	(white-space "[ \t]"))
+    (cond ((bobp) nil)
+	  ((looking-at word-constituent)
+	   (backward-char)
+	   (while (and (not (bobp)) (looking-at word-constituent))
+	     (backward-char))
+	   (if (or (not (bobp)) (not (looking-at word-constituent)))
+	       (forward-char)))
+	  ((looking-at white-space)
+	   (backward-char)
+	   (while (looking-at white-space)
+	     (backward-char))
+	   (forward-char)))))
+
+(defun default-mouse-track-end-of-word (symbolp)
+  (let ((word-constituent (cond ((eq symbolp t) "\\w\\|\\s_\\|\\s'")
+				((null symbolp) "\\w")
+				(t "[^ \t\n]")))
+	(white-space "[ \t]"))
+    (cond ((looking-at word-constituent) ; word or symbol constituent
+	   (while (looking-at word-constituent)
+	     (forward-char)))
+	  ((looking-at white-space) ; word or symbol constituent
+	   (while (looking-at white-space)
+	     (forward-char))))))
+
+;; Decide what will be the SYMBOLP argument to
+;; default-mouse-track-{beginning,end}-of-word, according to the
+;; syntax of the current character and value of mouse-highlight-text.
+(defsubst default-mouse-track-symbolp (syntax)
+  (cond ((eq mouse-highlight-text 'context)
+	 (eq syntax ?_))
+	((eq mouse-highlight-text 'symbol)
+	 t)
+	(t
+	 nil)))
+
+;; Return t if point is at an opening quote character.  This is
+;; determined by testing whether the syntax of the following character
+;; is `string', which will always be true for opening quotes and
+;; always false for closing quotes.
+(defun default-mouse-track-point-at-opening-quote-p ()
+  (save-excursion
+    (forward-char 1)
+    (eq (buffer-syntactic-context) 'string)))
+
+(defun default-mouse-track-normalize-point (type forwardp)
+  (cond ((eq type 'word)
+	 ;; trap the beginning and end of buffer errors
+	 (ignore-errors
+	   (setq type (char-syntax (char-after (point))))
+	   (if forwardp
+	       (if (or (= type ?\()
+		       (and (= type ?\")
+			    (default-mouse-track-point-at-opening-quote-p)))
+		   (goto-char (scan-sexps (point) 1))
+		 (default-mouse-track-end-of-word
+		   (default-mouse-track-symbolp type)))
+	     (if (or (= type ?\))
+		     (and (= type ?\")
+			  (not (default-mouse-track-point-at-opening-quote-p))))
+		 (goto-char (scan-sexps (1+ (point)) -1))
+	       (default-mouse-track-beginning-of-word
+		 (default-mouse-track-symbolp type))))))
+	((eq type 'line)
+	 (if forwardp (end-of-line) (beginning-of-line)))
+	((eq type 'buffer)
+	 (if forwardp (end-of-buffer) (beginning-of-buffer)))))
+
+(defun default-mouse-track-next-move (min-anchor max-anchor extent)
+  (let ((anchor (if (<= (point) min-anchor) max-anchor min-anchor)))
+    (funcall default-mouse-track-normalize-point-function
+	     default-mouse-track-type (> (point) anchor))
+    (if (consp extent)
+	(default-mouse-track-next-move-rect anchor (point) extent)
+      (if extent
+	  (if (<= anchor (point))
+	      (set-extent-endpoints extent anchor (point))
+	    (set-extent-endpoints extent (point) anchor))))))
+
+(defun default-mouse-track-next-move-rect (start end extents &optional pad-p)
+  (if (< end start)
+      (let ((tmp start)) (setq start end end tmp)))
+  (cond
+   ((= start end)		; never delete the last remaining extent
+    (mapcar 'delete-extent (cdr extents))
+    (setcdr extents nil)
+    (set-extent-endpoints (car extents) start start))
+   (t
+    (let ((indent-tabs-mode nil)	; if pad-p, don't use tabs
+	  (rest extents)
+	  left right last p)
+      (save-excursion
+	(save-restriction
+	  (goto-char end)
+	  (setq right (current-column))
+	  (goto-char start)
+	  (setq left (current-column))
+	  (if (< right left)
+	      (let ((tmp left))
+		(setq left right right tmp)
+		(setq start (- start (- right left))
+		      end (+ end (- right left)))))
+	  ;; End may have been set to a value greater than point-max if drag
+	  ;; or movement extends to end of buffer, so reset it.
+	  (setq end (min end (point-max)))
+	  (beginning-of-line)
+	  (narrow-to-region (point) end)
+	  (goto-char start)
+	  (while (and rest (not (eobp)))
+	    (setq p (point))
+	    (move-to-column right pad-p)
+	    (set-extent-endpoints (car rest) p (point))
+	    ;; this code used to look at the return value
+	    ;; of forward-line, but that doesn't work because
+	    ;; forward-line has bogus behavior: If you're on
+	    ;; the last line of a buffer but not at the very
+	    ;; end, forward-line will move you to the very
+	    ;; end and return 0 instead of 1, like it should.
+	    ;; the result was frequent infinite loops here,
+	    ;; creating very large numbers of extents at
+	    ;; the same position.  There was an N^2 sorting
+	    ;; algorithm in extents.c for extents at a
+	    ;; particular position, and the result was very
+	    ;; bad news.
+	    (forward-line 1)
+	    (if (not (eobp))
+		(move-to-column left pad-p))
+	    (setq last rest
+		  rest (cdr rest)))
+	  (cond (rest
+		 (mapcar 'delete-extent rest)
+		 (setcdr last nil))
+		((not (eobp))
+		 (while (not (eobp))
+		   (setq p (point))
+		   (move-to-column right pad-p)
+		   (let ((e (make-extent p (point))))
+		     (set-extent-face e (extent-face (car extents)))
+		     (set-extent-priority e (extent-priority (car extents)))
+		     (setcdr last (cons e nil))
+		     (setq last (cdr last)))
+		   (forward-line 1)
+		   (if (not (eobp))
+		       (move-to-column left pad-p))
+		   )))))
+      ))))
+
+(defun default-mouse-track-has-selection-p (buffer)
+  (and (selection-owner-p)
+       (extent-live-p primary-selection-extent)
+       (not (extent-detached-p primary-selection-extent))
+       (eq buffer (extent-object primary-selection-extent))))
+
+(defun default-mouse-track-anchor (adjust previous-point)
+  (if adjust
+      (if (default-mouse-track-has-selection-p (current-buffer))
+	  (let ((start (extent-start-position primary-selection-extent))
+		(end (extent-end-position primary-selection-extent)))
+	    (cond ((< (point) start) end)
+		  ((> (point) end) start)
+		  ((> (- (point) start) (- end (point))) start)
+		  (t end)))
+	previous-point)
+    (point)))
+
+(defun default-mouse-track-maybe-own-selection (pair type)
+  (let ((start (car pair))
+	(end (cdr pair)))
+    (or (= start end) (push-mark (if (= (point) start) end start)))
+    (cond (zmacs-regions
+	   (if (= start end)
+	       nil
+	     ;; #### UTTER KLUDGE.
+	     ;; If we don't have this sit-for here, then triple-clicking
+	     ;; will result in the line not being highlighted as it
+	     ;; should.  What appears to be happening is this:
+	     ;;
+	     ;; -- each time the button goes down, the selection is
+	     ;;    disowned (see comment "remove the existing selection
+	     ;;    to unclutter the display", below).
+	     ;; -- this causes a SelectionClear event to be sent to
+	     ;;    XEmacs.
+	     ;; -- each time the button goes up except the first, the
+	     ;;    selection is owned again.
+	     ;; -- later, XEmacs processes the SelectionClear event.
+	     ;;    The selection code attempts to keep track of the
+	     ;;    time that it last asserted the selection, and
+	     ;;    compare it to the time of the SelectionClear event,
+	     ;;    to see if it's a bogus notification or not (as
+	     ;;    is the case here).  However, for some unknown
+	     ;;    reason this doesn't work in the triple-clicking
+	     ;;    case, and the selection code bogusly thinks this
+	     ;;    SelectionClear event is the real thing.
+	     ;; -- putting the sit-for in causes the pending
+	     ;;    SelectionClear events to get processed before
+	     ;;    the selection is reasserted, so everything works
+	     ;;    out OK.
+	     ;;
+	     ;; Presumably(?) this means there is a weird timing bug
+	     ;; in the selection code, but there's not a chance in hell
+	     ;; that I have the patience to track it down.  Blame the
+	     ;; designers of X for fucking everything up so badly.
+	     ;;
+	     ;; This was originally a sit-for 0 but that wasn't
+	     ;; sufficient to make things work.  Even this isn't
+	     ;; always sufficient but it seems to give something
+	     ;; approaching a 99% success rate.  Making it higher yet
+	     ;; would help guarantee success with the price that the
+	     ;; delay would start to become noticeable.
+	     ;;
+	     (and (eq (console-type) 'x)
+		  (sit-for 0.15 t))
+	     (zmacs-activate-region)))
+	  ((console-on-window-system-p)
+	   (if (= start end)
+	       (disown-selection type)
+	     (if (consp default-mouse-track-extent)
+		 ;; own the rectangular region
+		 ;; this is a hack
+		 (let ((r default-mouse-track-extent))
+		   (save-excursion
+		     (set-buffer (get-buffer-create " *rect yank temp buf*"))
+		     (while r
+		       (insert (extent-string (car r)) "\n")
+		       (setq r (cdr r)))
+		     (own-selection (buffer-substring (point-min) (point-max)))
+		     (kill-buffer (current-buffer))))
+	       (own-selection (cons (set-marker (make-marker) start)
+				    (set-marker (make-marker) end))
+			      type)))))
+    (if (and (eq 'x (console-type))
+	     (not (= start end)))
+	;; I guess cutbuffers should do something with rectangles too.
+	;; does anybody use them?
+	(x-store-cutbuffer (buffer-substring start end)))))
+
+(defun default-mouse-track-deal-with-down-event (click-count)
+  (let ((event default-mouse-track-down-event))
+    (if (null event) nil
+      (select-frame (event-frame event))
+      (let ((adjust default-mouse-track-adjust)
+	    ;; ####When you click on the splash-screen,
+	    ;; event-{closest-,}point can be out of bounds.  Should
+	    ;; event-closest-point really be allowed to return a bad
+	    ;; position like that?  Maybe pixel_to_glyph_translation
+	    ;; needs to invalidate its cache when the buffer changes.
+	    ;; -dkindred@cs.cmu.edu
+	    (close-pos  (save-excursion
+			  (set-buffer (event-buffer event))
+			  (let ((p (event-closest-point event)))
+			    (and p (min (max p (point-min)) (point-max))))))
+	    extent previous-point)
+
+	(if (not (event-window event))
+	    (error "not over window?"))
+	(setq default-mouse-track-type
+	      (nth (mod (1- click-count)
+			(length default-mouse-track-type-list))
+		   default-mouse-track-type-list))
+	(setq default-mouse-track-window (event-window event))
+	;; Note that the extent used here is NOT the extent which
+	;; ends up as the value of zmacs-region-extent - this one is used
+	;; just during mouse-dragging.
+	(setq default-mouse-track-extent
+	      (make-extent close-pos close-pos (event-buffer event)))
+	(setq extent default-mouse-track-extent)
+	(set-extent-face extent 'zmacs-region)
+	;; While the selection is being dragged out, give the selection extent
+	;; slightly higher priority than any mouse-highlighted extent, so that
+	;; the exact endpoints of the selection will be visible while the mouse
+	;; is down.  Normally, the selection and mouse highlighting have the
+	;; same priority, so that conflicts between the two of them are
+	;; resolved by the usual size-and-endpoint-comparison method.
+	(set-extent-priority extent (1+ mouse-highlight-priority))
+	(if mouse-track-rectangle-p
+	    (setq default-mouse-track-extent
+		  (list default-mouse-track-extent)))
+
+	(setq previous-point
+	      (if (and adjust
+		       (markerp default-mouse-track-previous-point)
+		       (eq (current-buffer)
+			   (marker-buffer default-mouse-track-previous-point)))
+		  (marker-position default-mouse-track-previous-point)
+		(point)))
+	(default-mouse-track-set-point event default-mouse-track-window)
+	(if (not adjust)
+	    (if (markerp default-mouse-track-previous-point)
+		(set-marker default-mouse-track-previous-point (point))
+	      (setq default-mouse-track-previous-point (point-marker))))
+	;;
+	;; adjust point to a word or line boundary if appropriate
+	(let ((anchor (default-mouse-track-anchor adjust previous-point)))
+	  (setq default-mouse-track-min-anchor
+		(save-excursion (goto-char anchor)
+				(funcall
+				 default-mouse-track-normalize-point-function
+				 default-mouse-track-type nil)
+				(point)))
+	  (setq default-mouse-track-max-anchor
+		(save-excursion (goto-char anchor)
+				(funcall
+				 default-mouse-track-normalize-point-function
+				 default-mouse-track-type t)
+				(point))))
+	;;
+	;; remove the existing selection to unclutter the display
+	(if (not adjust)
+	    (cond (zmacs-regions
+		   (zmacs-deactivate-region))
+		  ((console-on-window-system-p)
+		   (disown-selection)))))
+      (setq default-mouse-track-down-event nil))))
+
+(defun default-mouse-track-down-hook (event click-count)
+  (setq default-mouse-track-down-event (copy-event event))
+  nil)
+
+(defun default-mouse-track-cleanup-extents-hook ()
+  (remove-hook 'pre-command-hook 'default-mouse-track-cleanup-extents-hook)
+  (let ((extent default-mouse-track-extent))
+    (if (consp extent) ; rectangle-p
+	(mapcar 'delete-extent extent)
+      (if extent
+	  (delete-extent extent)))))
+
+(defun default-mouse-track-cleanup-hook ()
+  (if zmacs-regions
+      (funcall 'default-mouse-track-cleanup-extents-hook)
+    (let ((extent default-mouse-track-extent)
+	  (func #'(lambda (e)
+		    (and (extent-live-p e)
+			 (set-extent-face e 'primary-selection)))))
+      (add-hook 'pre-command-hook 'default-mouse-track-cleanup-extents-hook)
+      (if (consp extent)		; rectangle-p
+	  (mapcar func extent)
+	(if extent
+	    (funcall func extent))))))
+
+(defun default-mouse-track-cleanup-extent ()
+  (let ((dead-func
+	 (function (lambda (x)
+		     (or (not (extent-live-p x))
+			 (extent-detached-p x)))))
+	(extent default-mouse-track-extent))
+    (if (consp extent)
+	(if (funcall dead-func extent)
+	    (let (newval)
+	      (mapcar (function (lambda (x)
+				  (if (not (funcall dead-func x))
+				      (setq newval (cons x newval)))))
+		      extent)
+	      (setq default-mouse-track-extent (nreverse newval))))
+      (if (funcall dead-func extent)
+	  (setq default-mouse-track-extent nil)))))
+
+(defun default-mouse-track-drag-hook (event click-count was-timeout)
+  (default-mouse-track-deal-with-down-event click-count)
+  (default-mouse-track-set-point event default-mouse-track-window)
+  (default-mouse-track-cleanup-extent)
+  (default-mouse-track-next-move default-mouse-track-min-anchor
+    default-mouse-track-max-anchor
+    default-mouse-track-extent)
+  t)
+
+(defun default-mouse-track-return-dragged-selection (event)
+  (default-mouse-track-cleanup-extent)
+  (let ((extent default-mouse-track-extent)
+	result)
+    (default-mouse-track-set-point-in-window event default-mouse-track-window)
+    (default-mouse-track-next-move default-mouse-track-min-anchor
+			   default-mouse-track-max-anchor
+			   extent)
+    (cond ((consp extent) ; rectangle-p
+	   (let ((first (car extent))
+		 (last (car (setq extent (nreverse extent)))))
+	     ;; nreverse is destructive so we need to reset this
+	     (setq default-mouse-track-extent extent)
+	     (setq result (cons (extent-start-position first)
+				(extent-end-position last)))
+	     ;; kludge to fix up region when dragging backwards...
+	     (if (and (/= (point) (extent-start-position first))
+		      (/= (point) (extent-end-position last))
+		      (= (point) (extent-end-position first)))
+		 (goto-char (car result)))))
+	  (extent
+	   (setq result (cons (extent-start-position extent)
+			      (extent-end-position extent)))))
+    ;; Minor kludge: if we're selecting in line-mode, include the
+    ;; final newline.  It's hard to do this in *-normalize-point.
+    (if (and result (eq default-mouse-track-type 'line))
+	(let ((end-p (= (point) (cdr result))))
+	  (goto-char (cdr result))
+	  (if (not (eobp))
+	      (setcdr result (1+ (cdr result))))
+	  (goto-char (if end-p (cdr result) (car result)))))
+;;;	  ;; Minor kludge sub 2.  If in char mode, and we drag the
+;;;	  ;; mouse past EOL, include the newline.
+;;;	  ;;
+;;;	  ;; Major problem: can't easily distinguish between being
+;;;	  ;; just past the last char on a line, and well past it,
+;;;	  ;; to determine whether or not to include it in the region
+;;;	  ;;
+;;;	  (if nil ; (eq default-mouse-track-type 'char)
+;;;	      (let ((after-end-p (and (not (eobp))
+;;; 				      (eolp)
+;;;				      (> (point) (car result)))))
+;;;		(if after-end-p
+;;;		    (progn
+;;;		      (setcdr result (1+ (cdr result)))
+;;;		      (goto-char (cdr result))))))
+    result))
+
+(defun default-mouse-track-drag-up-hook (event click-count)
+  (let ((result (default-mouse-track-return-dragged-selection event)))
+    (if result
+	(default-mouse-track-maybe-own-selection result 'PRIMARY)))
+  t)
+
+(defun default-mouse-track-click-hook (event click-count)
+  (default-mouse-track-drag-hook event click-count nil)
+  (default-mouse-track-drag-up-hook event click-count)
+  t)
+
+(add-hook 'mouse-track-down-hook 'default-mouse-track-down-hook)
+(add-hook 'mouse-track-drag-hook 'default-mouse-track-drag-hook)
+(add-hook 'mouse-track-drag-up-hook 'default-mouse-track-drag-up-hook)
+(add-hook 'mouse-track-click-hook 'default-mouse-track-click-hook)
+(add-hook 'mouse-track-cleanup-hook 'default-mouse-track-cleanup-hook)
+
+
+;;;;;;;;;;;; other mouse-track stuff (mostly associated with the
+;;;;;;;;;;;; default handlers)
+
+(defun mouse-track-default (event)
+  "Invoke `mouse-track' with only the default handlers active."
+  (interactive "e")
+  (let ((mouse-track-down-hook 'default-mouse-track-down-hook)
+	(mouse-track-drag-hook 'default-mouse-track-drag-hook)
+	(mouse-track-drag-up-hook 'default-mouse-track-drag-up-hook)
+	(mouse-track-click-hook 'default-mouse-track-click-hook)
+	(mouse-track-cleanup-hook 'default-mouse-track-cleanup-hook))
+    (mouse-track event)))
+
+(defun mouse-track-do-rectangle (event)
+  "Like `mouse-track' but selects rectangles instead of regions."
+  (interactive "e")
+  (let ((mouse-track-rectangle-p t))
+	(mouse-track event)))
+
+(defun mouse-track-adjust (event)
+  "Extend the existing selection.  This should be bound to a mouse button.
+The selection will be enlarged or shrunk so that the point of the mouse
+click is one of its endpoints.  This function in fact behaves fairly
+similarly to `mouse-track', but begins by extending the existing selection
+(or creating a new selection from the previous text cursor position to
+the current mouse position) instead of creating a new, empty selection.
+
+The mouse-track handlers are run from this command just like from
+`mouse-track'.  Therefore, do not call this command from a mouse-track
+handler!"
+  (interactive "e")
+  (let ((default-mouse-track-adjust t))
+    (mouse-track event)))
+
+(defun mouse-track-adjust-default (event)
+  "Extend the existing selection, using only the default handlers.
+This is just like `mouse-track-adjust' but will override any
+custom mouse-track handlers that the user may have installed."
+  (interactive "e")
+  (let ((default-mouse-track-adjust t))
+    (mouse-track-default event)))
+
+(defvar mouse-track-insert-selected-region nil)
+
+(defun mouse-track-insert-drag-up-hook (event click-count)
+  (setq mouse-track-insert-selected-region
+	(default-mouse-track-return-dragged-selection event)))
+
+(defun mouse-track-insert (event &optional delete)
+  "Make a selection with the mouse and insert it at point.
+This is exactly the same as the `mouse-track' command on \\[mouse-track],
+except that point is not moved; the selected text is immediately inserted
+after being selected\; and the selection is immediately disowned afterwards."
+  (interactive "*e")
+  (setq mouse-track-insert-selected-region nil)
+  (let ((mouse-track-drag-up-hook 'mouse-track-insert-drag-up-hook)
+ 	(mouse-track-click-hook 'mouse-track-insert-click-hook)
+	s)
+    (save-excursion
+      (save-window-excursion
+	(mouse-track event)
+	(if (consp mouse-track-insert-selected-region)
+	    (let ((pair mouse-track-insert-selected-region))
+	      (setq s (prog1
+			  (buffer-substring (car pair) (cdr pair))
+			(if delete
+			    (kill-region (car pair) (cdr pair)))))))))
+	(or (null s) (equal s "") (insert s))))
+
+(defun mouse-track-insert-click-hook (event click-count)
+  (default-mouse-track-drag-hook event click-count nil)
+  (mouse-track-insert-drag-up-hook event click-count)
+  t)
+
+(defun mouse-track-delete-and-insert (event)
+  "Make a selection with the mouse and insert it at point.
+This is exactly the same as the `mouse-track' command on \\[mouse-track],
+except that point is not moved; the selected text is immediately inserted
+after being selected\; and the text of the selection is deleted."
+  (interactive "*e")
+  (mouse-track-insert event t))
+
+;;;;;;;;;;;;;;;;;;;;;;;;
+
+
+(defvar inhibit-help-echo nil
+  "Inhibits display of `help-echo' extent properties in the minibuffer.")
+(defvar last-help-echo-object nil)
+(defvar help-echo-owns-message nil)
+
+(defun clear-help-echo (&optional ignored-frame)
+  (if help-echo-owns-message
+      (progn
+	(setq help-echo-owns-message nil
+	      last-help-echo-object nil)
+	(clear-message 'help-echo))))
+
+(defun show-help-echo (mess)
+  ;; (clear-help-echo)
+  (setq help-echo-owns-message t)
+  (display-message 'help-echo mess))
+
+(add-hook 'mouse-leave-frame-hook 'clear-help-echo)
+
+;; It may be a good idea to move this to C, for better performance of
+;; extent highlighting and pointer changes.
+(defun default-mouse-motion-handler (event)
+  "For use as the value of `mouse-motion-handler'.
+This implements the various pointer-shape variables,
+as well as extent highlighting, help-echo, toolbar up/down,
+and `mode-motion-hook'."
+  (let* ((frame (or (event-frame event) (selected-frame)))
+	 (window (event-window event))
+	 (buffer (event-buffer event))
+	 (modeline-point (and buffer (event-modeline-position event)))
+	 (modeline-string (and modeline-point
+			       (symbol-value-in-buffer
+				'generated-modeline-string buffer)))
+	 ;; point must be invalidated by modeline-point.
+	 (point (and buffer (not modeline-point)
+		     (event-point event)))
+	 (extent (or (and point
+			  (extent-at point buffer 'mouse-face))
+		     (and modeline-point
+			  (extent-at modeline-point modeline-string
+				     ;; Modeline extents don't have a
+				     ;; mouse-face property set.
+				     'help-echo))))
+	 (glyph-extent1 (event-glyph-extent event))
+	 (glyph-extent (and glyph-extent1
+			    (extent-live-p glyph-extent1)
+			    glyph-extent1))
+	 ;; This is an extent:
+	 (user-pointer1 (or (and glyph-extent
+				 (extent-property glyph-extent 'pointer)
+				 glyph-extent)
+			    (and point (extent-at point buffer 'pointer))
+			    (and modeline-point
+				 (extent-at modeline-point modeline-string
+					    'pointer))))
+	 ;; And this should be a glyph:
+	 (user-pointer (and user-pointer1 (extent-live-p user-pointer1)
+			    (extent-property user-pointer1 'pointer)))
+	 (button (event-toolbar-button event))
+	 (help (or (and glyph-extent (extent-property glyph-extent 'help-echo)
+			glyph-extent)
+		   (and button (not (null (toolbar-button-help-string button)))
+			button)
+		   (and point
+			(extent-at point buffer 'help-echo))
+		   (and modeline-point
+			(extent-at modeline-point modeline-string
+				   'help-echo))))
+	 ;; vars is a list of glyph variables to check for a pointer
+	 ;; value.
+	 (vars (cond
+		;; Checking if button is non-nil is not sufficent
+		;; since the pointer could be over a blank portion
+		;; of the toolbar.
+		((event-over-toolbar-p event)
+		 '(toolbar-pointer-glyph nontext-pointer-glyph
+					 text-pointer-glyph))
+		((or extent glyph-extent)
+		 '(selection-pointer-glyph text-pointer-glyph))
+		((event-over-modeline-p event)
+		 '(modeline-pointer-glyph nontext-pointer-glyph
+					  text-pointer-glyph))
+		((and (event-over-vertical-divider-p event)
+		      ;; #### I disagree with the check below.
+		      ;; Discuss it with Kirill for 21.1.  --hniksic
+		      (specifier-instance vertical-divider-always-visible-p
+					  (event-window event)))
+		 '(divider-pointer-glyph nontext-pointer-glyph
+					 text-pointer-glyph))
+		(point '(text-pointer-glyph))
+		(buffer '(nontext-pointer-glyph text-pointer-glyph))
+		(t '(nontext-pointer-glyph text-pointer-glyph))))
+	 pointer)
+    (and user-pointer (glyphp user-pointer)
+	 (push 'user-pointer vars))
+    (while (and vars (not (pointer-image-instance-p pointer)))
+      (setq pointer (glyph-image-instance (symbol-value (car vars))
+					  (or window frame))
+	    vars (cdr vars)))
+
+    (if (pointer-image-instance-p pointer)
+	(set-frame-pointer frame pointer))
+
+    ;; If last-pressed-toolbar-button is not nil, then check and see
+    ;; if we have moved to a new button and adjust the down flags
+    ;; accordingly.
+    (when (and (featurep 'toolbar) toolbar-active)
+      (unless (eq last-pressed-toolbar-button button)
+	(release-previous-toolbar-button event)
+	(and button (press-toolbar-button event))))
+
+    (cond (extent (highlight-extent extent t))
+	  (glyph-extent (highlight-extent glyph-extent t))
+	  (t (highlight-extent nil nil)))
+    (cond ((extentp help)
+           (or inhibit-help-echo
+               (eq help last-help-echo-object) ;save some time
+	       (eq (selected-window) (minibuffer-window))
+               (let ((hprop (extent-property help 'help-echo)))
+                 (setq last-help-echo-object help)
+                 (or (stringp hprop)
+                     (setq hprop (funcall hprop help)))
+                 (and hprop (show-help-echo hprop)))))
+	  ((and (featurep 'toolbar)
+                (toolbar-button-p help)
+                (toolbar-button-enabled-p help))
+	   (or (not toolbar-help-enabled)
+	       (eq help last-help-echo-object) ;save some time
+	       (eq (selected-window) (minibuffer-window))
+	       (let ((hstring (toolbar-button-help-string button)))
+		 (setq last-help-echo-object help)
+		 (or (stringp hstring)
+		     (setq hstring (funcall hstring help)))
+		 (and hstring (show-help-echo hstring)))))
+          (last-help-echo-object
+	   (clear-help-echo)))
+    (if mouse-grabbed-buffer (setq buffer mouse-grabbed-buffer))
+    (if (and buffer (symbol-value-in-buffer 'mode-motion-hook buffer nil))
+	(with-current-buffer buffer
+	  (run-hook-with-args 'mode-motion-hook event)
+
+	  ;; If the mode-motion-hook created a highlightable extent around
+	  ;; the mouse-point, highlight it right away.  Otherwise it wouldn't
+	  ;; be highlighted until the *next* motion event came in.
+	  (if (and point
+		   (null extent)
+		   (setq extent (extent-at point
+					   (event-buffer event) ; not buffer
+					   'mouse-face)))
+	      (highlight-extent extent t)))))
+  nil)
+
+(setq mouse-motion-handler 'default-mouse-motion-handler)
+
+;;
+;; Vertical divider dragging
+;;
+(defun drag-window-divider (event)
+  "Handle resizing windows by dragging window dividers.
+This is an intenal function, normally bound to button1 event in
+window-divider-map. You would not call it, but you may bind it to
+other mouse buttons."
+  (interactive "e")
+  ;; #### I disagree with the check below.
+  ;; Discuss it with Kirill for 21.1.  --hniksic
+  (if (not (specifier-instance vertical-divider-always-visible-p
+			       (event-window event)))
+      (error "Not over a window"))
+  (let-specifier ((vertical-divider-shadow-thickness
+		   (- (specifier-instance vertical-divider-shadow-thickness
+					  (event-window event)))
+		   (event-window event)))
+    (let* ((window (event-window event))
+	   (frame (event-channel event))
+	   (last-timestamp (event-timestamp event))
+	   done)
+      (while (not done)
+	(let* ((edges (window-pixel-edges window))
+	       (old-right (caddr edges))
+	       (old-left (car edges))
+	       (backup-conf (current-window-configuration frame))
+	       (old-edges-all-windows (mapcar 'window-pixel-edges
+					      (window-list))))
+
+	  ;; This is borrowed from modeline.el:
+	  ;; requeue event and quit if this is a misc-user, eval or
+	  ;;   keypress event.
+	  ;; quit if this is a button press or release event, or if the event
+	  ;;   occurred in some other frame.
+	  ;; drag if this is a mouse motion event and the time
+	  ;;   between this event and the last event is greater than
+	  ;;   drag-divider-event-lag.
+	  ;; do nothing if this is any other kind of event.
+	  (setq event (next-event event))
+	  (cond ((or (misc-user-event-p event)
+		     (key-press-event-p event))
+		 (setq unread-command-events (nconc unread-command-events
+						    (list event))
+		       done t))
+		((button-release-event-p event)
+		 (setq done t))
+		((button-event-p event)
+		 (setq done t))
+		((not (motion-event-p event))
+		 (dispatch-event event))
+		((not (eq frame (event-frame event)))
+		 (setq done t))
+		((< (abs (- (event-timestamp event) last-timestamp))
+		    drag-divider-event-lag))
+		(t
+		 (setq last-timestamp (event-timestamp event))
+		 ;; Enlarge the window, calculating change in characters
+		 ;; of default font. Do not let the window to become
+		 ;; less than alolwed minimum (not because that's critical
+		 ;; for the code performance, just the visual effect is
+		 ;; better: when cursor goes to the left of the next left
+		 ;; divider, the vindow being resized shrinks to minimal
+		 ;; size.
+		 (enlarge-window (max (- window-min-width (window-width window))
+				      (/ (- (event-x-pixel event) old-right)
+					 (face-width 'default window)))
+				 t window)
+		 ;; Backout the change if some windows got deleted, or
+		 ;; if the change caused more than two windows to resize
+		 ;; (shifting the whole stack right is ugly), or if the
+		 ;; left window side has slipped (right side cannot be
+		 ;; moved any funrther to the right, so enlarge-window
+		 ;; plays bad games with the left edge.
+		 (if (or (/= (count-windows) (length old-edges-all-windows))
+			 (/= old-left (car (window-pixel-edges window)))
+			 ;; This check is very hairy. We allow any number
+			 ;; of left edges to change, but only to the same
+			 ;; new value. Similar procedure is for the right edges.
+			 (let ((all-that-bad nil)
+			       (new-left-ok nil)
+			       (new-right-ok nil))
+			   (mapcar* (lambda (window old-edges)
+				      (let ((new (car (window-pixel-edges window))))
+					(if (/= new (car old-edges))
+					    (if (and new-left-ok
+						     (/= new-left-ok new))
+						(setq all-that-bad t)
+					      (setq new-left-ok new)))))
+				    (window-list) old-edges-all-windows)
+			   (mapcar* (lambda (window old-edges)
+				      (let ((new (caddr (window-pixel-edges window))))
+					(if (/= new (caddr old-edges))
+					    (if (and new-right-ok
+						     (/= new-right-ok new))
+						(setq all-that-bad t)
+					      (setq new-right-ok new)))))
+				    (window-list) old-edges-all-windows)
+			   all-that-bad))
+		     (set-window-configuration backup-conf)))))))))
+
+(setq vertical-divider-map (make-keymap))
+(define-key vertical-divider-map 'button1 'drag-window-divider)
+
+;;; mouse.el ends here