Remove code for defunct system-types emx, macos, mswindows,

[gnu-emacs] / lisp / mouse.el

;;; mouse.el --- window system-independent mouse support

;; Copyright (C) 1993, 1994, 1995, 1999, 2000, 2001, 2002, 2003, 2004,
;;   2005, 2006, 2007, 2008, 2009  Free Software Foundation, Inc.

;; Maintainer: FSF
;; Keywords: hardware, 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 3 of the License, 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.  If not, see <http://www.gnu.org/licenses/>.

;;; Commentary:

;; This package provides various useful commands (including help
;; system access) through the mouse.  All this code assumes that mouse
;; interpretation has been abstracted into Emacs input events.
;;
;; The code is rather X-dependent.

;;; Code:

;;; Utility functions.

;; Indent track-mouse like progn.
(put 'track-mouse 'lisp-indent-function 0)

(defcustom mouse-yank-at-point nil
  "If non-nil, mouse yank commands yank at point instead of at click."
  :type 'boolean
  :group 'mouse)

(defcustom mouse-drag-copy-region t
  "If non-nil, mouse drag copies region to kill-ring."
  :type 'boolean
  :version "22.1"
  :group 'mouse)

(defcustom mouse-1-click-follows-link 450
  "Non-nil means that clicking Mouse-1 on a link follows the link.

With the default setting, an ordinary Mouse-1 click on a link
performs the same action as Mouse-2 on that link, while a longer
Mouse-1 click \(hold down the Mouse-1 button for more than 450
milliseconds) performs the original Mouse-1 binding \(which
typically sets point where you click the mouse).

If value is an integer, the time elapsed between pressing and
releasing the mouse button determines whether to follow the link
or perform the normal Mouse-1 action (typically set point).
The absolute numeric value specifices the maximum duration of a
\"short click\" in milliseconds.  A positive value means that a
short click follows the link, and a longer click performs the
normal action.  A negative value gives the opposite behavior.

If value is `double', a double click follows the link.

Otherwise, a single Mouse-1 click unconditionally follows the link.

Note that dragging the mouse never follows the link.

This feature only works in modes that specifically identify
clickable text as links, so it may not work with some external
packages.  See `mouse-on-link-p' for details."
  :version "22.1"
  :type '(choice (const :tag "Disabled" nil)
                 (const :tag "Double click" double)
                 (number :tag "Single click time limit" :value 450)
                 (other :tag "Single click" t))
  :group 'mouse)

(defcustom mouse-1-click-in-non-selected-windows t
  "If non-nil, a Mouse-1 click also follows links in non-selected windows.

If nil, a Mouse-1 click on a link in a non-selected window performs
the normal mouse-1 binding, typically selects the window and sets
point at the click position."
  :type 'boolean
  :version "22.1"
  :group 'mouse)


\f
;; Provide a mode-specific menu on a mouse button.

(defun popup-menu (menu &optional position prefix)
  "Popup the given menu and call the selected option.
MENU can be a keymap, an easymenu-style menu or a list of keymaps as for
`x-popup-menu'.
POSITION can be a click event or ((XOFFSET YOFFSET) WINDOW) and defaults to
  the current mouse position.
PREFIX is the prefix argument (if any) to pass to the command."
  (let* ((map (cond
               ((keymapp menu) menu)
               ((and (listp menu) (keymapp (car menu))) menu)
               (t (let* ((map (easy-menu-create-menu (car menu) (cdr menu)))
                         (filter (when (symbolp map)
                                   (plist-get (get map 'menu-prop) :filter))))
                    (if filter (funcall filter (symbol-function map)) map)))))
         event cmd)
    (unless position
      (let ((mp (mouse-pixel-position)))
        (setq position (list (list (cadr mp) (cddr mp)) (car mp)))))
    ;; The looping behavior was taken from lmenu's popup-menu-popup
    (while (and map (setq event
                          ;; map could be a prefix key, in which case
                          ;; we need to get its function cell
                          ;; definition.
                          (x-popup-menu position (indirect-function map))))
      ;; Strangely x-popup-menu returns a list.
      ;; mouse-major-mode-menu was using a weird:
      ;; (key-binding (apply 'vector (append '(menu-bar) menu-prefix events)))
      (setq cmd
            (if (and (not (keymapp map)) (listp map))
                ;; We were given a list of keymaps.  Search them all
                ;; in sequence until a first binding is found.
                (let ((mouse-click (apply 'vector event))
                      binding)
                  (while (and map (null binding))
                    (setq binding (lookup-key (car map) mouse-click))
                    (if (numberp binding) ; `too long'
                        (setq binding nil))
                    (setq map (cdr map)))
                  binding)
              ;; We were given a single keymap.
              (lookup-key map (apply 'vector event))))
      ;; Clear out echoing, which perhaps shows a prefix arg.
      (message "")
      ;; Maybe try again but with the submap.
      (setq map (if (keymapp cmd) cmd)))
    ;; If the user did not cancel by refusing to select,
    ;; and if the result is a command, run it.
    (when (and (null map) (commandp cmd))
      (setq prefix-arg prefix)
      ;; `setup-specified-language-environment', for instance,
      ;; expects this to be set from a menu keymap.
      (setq last-command-event (car (last event)))
      ;; mouse-major-mode-menu was using `command-execute' instead.
      (call-interactively cmd))))

(defun minor-mode-menu-from-indicator (indicator)
  "Show menu for minor mode specified by INDICATOR.
Interactively, INDICATOR is read using completion.
If there is no menu defined for the minor mode, then create one with
items `Turn Off' and `Help'."
  (interactive
   (list (completing-read
          "Minor mode indicator: "
          (describe-minor-mode-completion-table-for-indicator))))
  (let ((minor-mode (lookup-minor-mode-from-indicator indicator)))
    (unless minor-mode (error "Cannot find minor mode for `%s'" indicator))
    (let* ((map (cdr-safe (assq minor-mode minor-mode-map-alist)))
           (menu (and (keymapp map) (lookup-key map [menu-bar]))))
      (setq menu
            (if menu
                (mouse-menu-non-singleton menu)
              `(keymap
                ,indicator
                (turn-off menu-item "Turn Off minor mode" ,minor-mode)
                (help menu-item "Help for minor mode"
                      (lambda () (interactive)
                        (describe-function ',minor-mode))))))
      (popup-menu menu))))

(defun mouse-minor-mode-menu (event)
  "Show minor-mode menu for EVENT on minor modes area of the mode line."
  (interactive "@e")
  (let ((indicator (car (nth 4 (car (cdr event))))))
    (minor-mode-menu-from-indicator indicator)))

(defun mouse-menu-major-mode-map ()
  (let* (;; Keymap from which to inherit; may be null.
         (ancestor (mouse-menu-non-singleton
                    (and (current-local-map)
                         (local-key-binding [menu-bar]))))
         ;; Make a keymap in which our last command leads to a menu or
         ;; default to the edit menu.
         (newmap (if ancestor
                     (make-sparse-keymap (concat (format-mode-line mode-name)
                                                 " Mode"))
                   menu-bar-edit-menu))
         uniq)
    (if ancestor
        (set-keymap-parent newmap ancestor))
    newmap))

(defun mouse-menu-non-singleton (menubar)
  "Given menu keymap,
if it defines exactly one submenu, return just that submenu.
Otherwise return the whole menu."
  (if menubar
      (let (submap)
        (map-keymap
         (lambda (k v) (setq submap (if submap t (cons k v))))
         (keymap-canonicalize menubar))
        (if (eq submap t)
            menubar
          (lookup-key menubar (vector (car submap)))))))

(defun mouse-menu-bar-map ()
  "Return a keymap equivalent to the menu bar.
The contents are the items that would be in the menu bar whether or
not it is actually displayed."
  (let* ((local-menu (and (current-local-map)
                          (lookup-key (current-local-map) [menu-bar])))
         (global-menu (lookup-key global-map [menu-bar]))
         ;; If a keymap doesn't have a prompt string (a lazy
         ;; programmer didn't bother to provide one), create it and
         ;; insert it into the keymap; each keymap gets its own
         ;; prompt.  This is required for non-toolkit versions to
         ;; display non-empty menu pane names.
         (minor-mode-menus
          (mapcar
           (lambda (menu)
             (let* ((minor-mode (car menu))
                    (menu (cdr menu))
                    (title-or-map (cadr menu)))
               (or (stringp title-or-map)
                   (setq menu
                         (cons 'keymap
                               (cons (concat
                                      (capitalize (subst-char-in-string
                                                   ?- ?\s (symbol-name
                                                           minor-mode)))
                                      " Menu")
                                     (cdr menu)))))
               menu))
           (minor-mode-key-binding [menu-bar])))
         (local-title-or-map (and local-menu (cadr local-menu)))
         (global-title-or-map (cadr global-menu)))
    (or (null local-menu)
        (stringp local-title-or-map)
        (setq local-menu (cons 'keymap
                               (cons (concat (format-mode-line mode-name)
                                             " Mode Menu")
                                     (cdr local-menu)))))
    (or (stringp global-title-or-map)
        (setq global-menu (cons 'keymap
                                (cons "Global Menu"
                                      (cdr global-menu)))))
    ;; Supplying the list is faster than making a new map.
    ;; FIXME: We have a problem here: we have to use the global/local/minor
    ;; so they're displayed in the expected order, but later on in the command
    ;; loop, they're actually looked up in the opposite order.
    (apply 'append
           global-menu
           local-menu
           minor-mode-menus)))

(defun mouse-major-mode-menu (event &optional prefix)
  "Pop up a mode-specific menu of mouse commands.
Default to the Edit menu if the major mode doesn't define a menu."
  (interactive "@e\nP")
  (run-hooks 'activate-menubar-hook 'menu-bar-update-hook)
  (popup-menu (mouse-menu-major-mode-map) event prefix))
(make-obsolete 'mouse-major-mode-menu 'mouse-menu-major-mode-map "23.1")

(defun mouse-popup-menubar (event prefix)
  "Pop up a menu equivalent to the menu bar for keyboard EVENT with PREFIX.
The contents are the items that would be in the menu bar whether or
not it is actually displayed."
  (interactive "@e \nP")
  (run-hooks 'activate-menubar-hook 'menu-bar-update-hook)
  (popup-menu (mouse-menu-bar-map) event prefix))
(make-obsolete 'mouse-popup-menubar 'mouse-menu-bar-map "23.1")

(defun mouse-popup-menubar-stuff (event prefix)
  "Popup a menu like either `mouse-major-mode-menu' or `mouse-popup-menubar'.
Use the former if the menu bar is showing, otherwise the latter."
  (interactive "@e\nP")
  (run-hooks 'activate-menubar-hook 'menu-bar-update-hook)
  (popup-menu
   (if (zerop (or (frame-parameter nil 'menu-bar-lines) 0))
       (mouse-menu-bar-map)
     (mouse-menu-major-mode-map))
   event prefix))
(make-obsolete 'mouse-popup-menubar-stuff nil "23.1")
\f
;; Commands that operate on windows.

(defun mouse-minibuffer-check (event)
  (let ((w (posn-window (event-start event))))
    (and (window-minibuffer-p w)
         (not (minibuffer-window-active-p w))
         (error "Minibuffer window is not active")))
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook))

(defun mouse-delete-window (click)
  "Delete the window you click on.
Do nothing if the frame has just one window.
This command must be bound to a mouse click."
  (interactive "e")
  (unless (one-window-p t)
    (mouse-minibuffer-check click)
    (delete-window (posn-window (event-start click)))))

(defun mouse-select-window (click)
  "Select the window clicked on; don't move point."
  (interactive "e")
  (mouse-minibuffer-check click)
  (let ((oframe (selected-frame))
        (frame (window-frame (posn-window (event-start click)))))
    (select-window (posn-window (event-start click)))
    (raise-frame frame)
    (select-frame frame)
    (or (eq frame oframe)
        (set-mouse-position (selected-frame) (1- (frame-width)) 0))))

(defun mouse-tear-off-window (click)
  "Delete the window clicked on, and create a new frame displaying its buffer."
  (interactive "e")
  (mouse-minibuffer-check click)
  (let* ((window (posn-window (event-start click)))
         (buf (window-buffer window))
         (frame (make-frame)))
    (select-frame frame)
    (switch-to-buffer buf)
    (delete-window window)))

(defun mouse-delete-other-windows ()
  "Delete all windows except the one you click on."
  (interactive "@")
  (delete-other-windows))

(defun mouse-split-window-vertically (click)
  "Select Emacs window mouse is on, then split it vertically in half.
The window is split at the line clicked on.
This command must be bound to a mouse click."
  (interactive "@e")
  (mouse-minibuffer-check click)
  (let ((start (event-start click)))
    (select-window (posn-window start))
    (let ((new-height (1+ (cdr (posn-col-row (event-end click)))))
          (first-line window-min-height)
          (last-line (- (window-height) window-min-height)))
      (if (< last-line first-line)
          (error "Window too short to split")
        (split-window-vertically
         (min (max new-height first-line) last-line))))))

(defun mouse-split-window-horizontally (click)
  "Select Emacs window mouse is on, then split it horizontally in half.
The window is split at the column clicked on.
This command must be bound to a mouse click."
  (interactive "@e")
  (mouse-minibuffer-check click)
  (let ((start (event-start click)))
    (select-window (posn-window start))
    (let ((new-width (1+ (car (posn-col-row (event-end click)))))
          (first-col window-min-width)
          (last-col (- (window-width) window-min-width)))
      (if (< last-col first-col)
          (error "Window too narrow to split")
        (split-window-horizontally
         (min (max new-width first-col) last-col))))))

(defun mouse-drag-window-above (window)
  "Return the (or a) window directly above WINDOW.
That means one whose bottom edge is at the same height as WINDOW's top edge."
  (let ((start-top   (nth 1 (window-edges window)))
        (start-left  (nth 0 (window-edges window)))
        (start-right (nth 2 (window-edges window)))
        (start-window window)
        above-window)
    (setq window (previous-window window 0))
    (while (and (not above-window) (not (eq window start-window)))
      (let ((left  (nth 0 (window-edges window)))
            (right (nth 2 (window-edges window))))
        (when (and (= (+ (window-height window) (nth 1 (window-edges window)))
                      start-top)
                   (or (and (<= left start-left)  (<= start-right right))
                       (and (<= start-left left)  (<= left start-right))
                       (and (<= start-left right) (<= right start-right))))
          (setq above-window window)))
      (setq window (previous-window window)))
    above-window))

(defun mouse-drag-move-window-bottom (window growth)
  "Move the bottom of WINDOW up or down by GROWTH lines.
Move it down if GROWTH is positive, or up if GROWTH is negative.
If this would make WINDOW too short,
shrink the window or windows above it to make room."
  (condition-case nil
      (adjust-window-trailing-edge window growth nil)
    (error nil)))

(defsubst mouse-drag-move-window-top (window growth)
  "Move the top of WINDOW up or down by GROWTH lines.
Move it down if GROWTH is positive, or up if GROWTH is negative.
If this would make WINDOW too short, shrink the window or windows
above it to make room."
  ;; Moving the top of WINDOW is actually moving the bottom of the
  ;; window above.
  (let ((window-above (mouse-drag-window-above window)))
    (and window-above
         (mouse-drag-move-window-bottom window-above (- growth)))))

(defun mouse-drag-mode-line-1 (start-event mode-line-p)
  "Change the height of a window by dragging on the mode or header line.
START-EVENT is the starting mouse-event of the drag action.
MODE-LINE-P non-nil means dragging a mode line; nil means a header line."
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook)
  (let* ((done nil)
         (echo-keystrokes 0)
         (start (event-start start-event))
         (start-event-window (posn-window start))
         (start-event-frame (window-frame start-event-window))
         (start-nwindows (count-windows t))
         (on-link (and mouse-1-click-follows-link
                       (or mouse-1-click-in-non-selected-windows
                           (eq (posn-window start) (selected-window)))
                       (mouse-on-link-p start)))
         (minibuffer (frame-parameter nil 'minibuffer))
         should-enlarge-minibuffer event mouse y top bot edges wconfig growth)
    (track-mouse
      (progn
        ;; if this is the bottommost ordinary window, then to
        ;; move its modeline the minibuffer must be enlarged.
        (setq should-enlarge-minibuffer
              (and minibuffer
                   mode-line-p
                   (not (one-window-p t))
                   (= (nth 1 (window-edges minibuffer))
                      (nth 3 (window-edges start-event-window)))))

        ;; loop reading events and sampling the position of
        ;; the mouse.
        (while (not done)
          (setq event (read-event)
                mouse (mouse-position))

          ;; do nothing if
          ;;   - there is a switch-frame event.
          ;;   - the mouse isn't in the frame that we started in
          ;;   - the mouse isn't in any Emacs frame
          ;; drag if
          ;;   - there is a mouse-movement event
          ;;   - there is a scroll-bar-movement event
          ;;     (same as mouse movement for our purposes)
          ;; quit if
          ;;   - there is a keyboard event or some other unknown event.
          (cond ((not (consp event))
                 (setq done t))

                ((memq (car event) '(switch-frame select-window))
                 nil)

                ((not (memq (car event) '(mouse-movement scroll-bar-movement)))
                 (when (consp event)
                   ;; Do not unread a drag-mouse-1 event since it will cause the
                   ;; selection of the window above when dragging the modeline
                   ;; above the selected window.
                   (unless (eq (car event) 'drag-mouse-1)
                     (push event unread-command-events)))
                 (setq done t))

                ((not (eq (car mouse) start-event-frame))
                 nil)

                ((null (car (cdr mouse)))
                 nil)

                (t
                 (setq y (cdr (cdr mouse))
                       edges (window-edges start-event-window)
                       top (nth 1 edges)
                       bot (nth 3 edges))

                 ;; compute size change needed
                 (cond (mode-line-p
                        (setq growth (- y bot -1)))
                       (t       ; header line
                        (when (< (- bot y) window-min-height)
                          (setq y (- bot window-min-height)))
                        ;; The window's top includes the header line!
                        (setq growth (- top y))))
                 (setq wconfig (current-window-configuration))

                 ;; Check for an error case.
                 (when (and (/= growth 0)
                            (not minibuffer)
                            (one-window-p t))
                   (error "Attempt to resize sole window"))

                 ;; If we ever move, make sure we don't mistakenly treat
                 ;; some unexpected `mouse-1' final event as a sign that
                 ;; this whole drag was nothing more than a click.
                 (if (/= growth 0) (setq on-link nil))

                 ;; grow/shrink minibuffer?
                 (if should-enlarge-minibuffer
                     (unless resize-mini-windows
                       (mouse-drag-move-window-bottom start-event-window growth))
                   ;; no.  grow/shrink the selected window
                   ;(message "growth = %d" growth)
                   (if mode-line-p
                       (mouse-drag-move-window-bottom start-event-window growth)
                     (mouse-drag-move-window-top start-event-window growth)))

                 ;; if this window's growth caused another
                 ;; window to be deleted because it was too
                 ;; short, rescind the change.
                 ;;
                 ;; if size change caused space to be stolen
                 ;; from a window above this one, rescind the
                 ;; change, but only if we didn't grow/shrink
                 ;; the minibuffer.  minibuffer size changes
                 ;; can cause all windows to shrink... no way
                 ;; around it.
                 (when (or (/= start-nwindows (count-windows t))
                           (and (not should-enlarge-minibuffer)
                                (> growth 0)
                                mode-line-p
                                (/= top
                                    (nth 1 (window-edges
                                            ;; Choose right window.
                                            start-event-window)))))
                   (set-window-configuration wconfig)))))

        ;; Presumably if this was just a click, the last event should
        ;; be `mouse-1', whereas if this did move the mouse, it should be
        ;; a `drag-mouse-1'.  In any case `on-link' would have been nulled
        ;; above if there had been any significant mouse movement.
        (when (and on-link (eq 'mouse-1 (car-safe event)))
          (push (cons 'mouse-2 (cdr event)) unread-command-events))))))

(defun mouse-drag-mode-line (start-event)
  "Change the height of a window by dragging on the mode line."
  (interactive "e")
  (mouse-drag-mode-line-1 start-event t))

(defun mouse-drag-header-line (start-event)
  "Change the height of a window by dragging on the header line.
Windows whose header-lines are at the top of the frame cannot be
resized by dragging their header-line."
  (interactive "e")
  ;; Changing the window's size by dragging its header-line when the
  ;; header-line is at the top of the frame is somewhat strange,
  ;; because the header-line doesn't move, so don't do it.
  (let* ((start (event-start start-event))
         (window (posn-window start))
         (frame (window-frame window))
         (first-window (frame-first-window frame)))
    (unless (or (eq window first-window)
                (= (nth 1 (window-edges window))
                   (nth 1 (window-edges first-window))))
      (mouse-drag-mode-line-1 start-event nil))))

\f
(defun mouse-drag-vertical-line-rightward-window (window)
  "Return a window that is immediately to the right of WINDOW, or nil."
  (let ((bottom (nth 3 (window-inside-edges window)))
        (left (nth 0 (window-inside-edges window)))
        best best-right
        (try (previous-window window)))
    (while (not (eq try window))
      (let ((try-top (nth 1 (window-inside-edges try)))
            (try-bottom (nth 3 (window-inside-edges try)))
            (try-right (nth 2 (window-inside-edges try))))
        (if (and (< try-top bottom)
                 (>= try-bottom bottom)
                 (< try-right left)
                 (or (null best-right) (> try-right best-right)))
            (setq best-right try-right best try)))
      (setq try (previous-window try)))
    best))

(defun mouse-drag-vertical-line (start-event)
  "Change the width of a window by dragging on the vertical line."
  (interactive "e")
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook)
  (let* ((done nil)
         (echo-keystrokes 0)
         (start-event-frame (window-frame (car (car (cdr start-event)))))
         (start-event-window (car (car (cdr start-event))))
         event mouse x left right edges growth
         (which-side
          (or (cdr (assq 'vertical-scroll-bars (frame-parameters start-event-frame)))
              'right)))
    (cond
     ((one-window-p t)
      (error "Attempt to resize sole ordinary window"))
     ((and (eq which-side 'right)
           (>= (nth 2 (window-inside-edges start-event-window))
               (frame-width start-event-frame)))
      (error "Attempt to drag rightmost scrollbar"))
     ((and (eq which-side 'left)
           (= (nth 0 (window-inside-edges start-event-window)) 0))
      (error "Attempt to drag leftmost scrollbar")))
    (track-mouse
      (progn
        ;; loop reading events and sampling the position of
        ;; the mouse.
        (while (not done)
          (setq event (read-event)
                mouse (mouse-position))
          ;; do nothing if
          ;;   - there is a switch-frame event.
          ;;   - the mouse isn't in the frame that we started in
          ;;   - the mouse isn't in any Emacs frame
          ;; drag if
          ;;   - there is a mouse-movement event
          ;;   - there is a scroll-bar-movement event
          ;;     (same as mouse movement for our purposes)
          ;; quit if
          ;;   - there is a keyboard event or some other unknown event
          ;;     unknown event.
          (cond ((integerp event)
                 (setq done t))
                ((memq (car event) '(switch-frame select-window))
                 nil)
                ((not (memq (car event)
                            '(mouse-movement scroll-bar-movement)))
                 (if (consp event)
                     (setq unread-command-events
                           (cons event unread-command-events)))
                 (setq done t))
                ((not (eq (car mouse) start-event-frame))
                 nil)
                ((null (car (cdr mouse)))
                 nil)
                (t
                 (let ((window
                        ;; If the scroll bar is on the window's left,
                        ;; adjust the window on the left.
                        (if (eq which-side 'right)
                            start-event-window
                          (mouse-drag-vertical-line-rightward-window
                           start-event-window))))
                   (setq x (- (car (cdr mouse))
                              (if (eq which-side 'right) 0 2))
                         edges (window-edges window)
                         left (nth 0 edges)
                         right (nth 2 edges))
                   ;; scale back a move that would make the
                   ;; window too thin.
                   (if (< (- x left -1) window-min-width)
                       (setq x (+ left window-min-width -1)))
                   ;; compute size change needed
                   (setq growth (- x right -1))
                   (condition-case nil
                       (adjust-window-trailing-edge window growth t)
                     (error nil))))))))))
\f
(defun mouse-set-point (event)
  "Move point to the position clicked on with the mouse.
This should be bound to a mouse click event type."
  (interactive "e")
  (mouse-minibuffer-check event)
  ;; Use event-end in case called from mouse-drag-region.
  ;; If EVENT is a click, event-end and event-start give same value.
  (posn-set-point (event-end event)))

(defvar mouse-last-region-beg nil)
(defvar mouse-last-region-end nil)
(defvar mouse-last-region-tick nil)

(defun mouse-region-match ()
  "Return non-nil if there's an active region that was set with the mouse."
  (and (mark t) mark-active
       (eq mouse-last-region-beg (region-beginning))
       (eq mouse-last-region-end (region-end))
       (eq mouse-last-region-tick (buffer-modified-tick))))

(defun mouse-set-region (click)
  "Set the region to the text dragged over, and copy to kill ring.
This should be bound to a mouse drag event."
  (interactive "e")
  (mouse-minibuffer-check click)
  (select-window (posn-window (event-start click)))
  (let ((beg (posn-point (event-start click)))
        (end (posn-point (event-end click))))
    (and mouse-drag-copy-region (integerp beg) (integerp end)
         ;; Don't set this-command to `kill-region', so a following
         ;; C-w won't double the text in the kill ring.  Ignore
         ;; `last-command' so we don't append to a preceding kill.
         (let (this-command last-command deactivate-mark)
           (copy-region-as-kill beg end)))
    (if (numberp beg) (goto-char beg))
    ;; On a text terminal, bounce the cursor.
    (or transient-mark-mode
        (window-system)
        (sit-for 1))
    (push-mark)
    ;; If `select-active-regions' is non-nil, `set-mark' sets the
    ;; primary selection to the buffer's region, overriding the role
    ;; of `copy-region-as-kill'; that's why we did the copy first.
    (set-mark (point))
    (if (numberp end) (goto-char end))
    (mouse-set-region-1)))

(defun mouse-set-region-1 ()
  ;; Set transient-mark-mode for a little while.
  (unless (eq (car-safe transient-mark-mode) 'only)
    (setq transient-mark-mode
          (cons 'only
                (unless (eq transient-mark-mode 'lambda)
                  transient-mark-mode))))
  (setq mouse-last-region-beg (region-beginning))
  (setq mouse-last-region-end (region-end))
  (setq mouse-last-region-tick (buffer-modified-tick)))

(defcustom mouse-scroll-delay 0.25
  "The pause between scroll steps caused by mouse drags, in seconds.
If you drag the mouse beyond the edge of a window, Emacs scrolls the
window to bring the text beyond that edge into view, with a delay of
this many seconds between scroll steps.  Scrolling stops when you move
the mouse back into the window, or release the button.
This variable's value may be non-integral.
Setting this to zero causes Emacs to scroll as fast as it can."
  :type 'number
  :group 'mouse)

(defcustom mouse-scroll-min-lines 1
  "The minimum number of lines scrolled by dragging mouse out of window.
Moving the mouse out the top or bottom edge of the window begins
scrolling repeatedly.  The number of lines scrolled per repetition
is normally equal to the number of lines beyond the window edge that
the mouse has moved.  However, it always scrolls at least the number
of lines specified by this variable."
  :type 'integer
  :group 'mouse)

(defun mouse-scroll-subr (window jump &optional overlay start)
  "Scroll the window WINDOW, JUMP lines at a time, until new input arrives.
If OVERLAY is an overlay, let it stretch from START to the far edge of
the newly visible text.
Upon exit, point is at the far edge of the newly visible text."
  (cond
   ((and (> jump 0) (< jump mouse-scroll-min-lines))
    (setq jump mouse-scroll-min-lines))
   ((and (< jump 0) (< (- jump) mouse-scroll-min-lines))
    (setq jump (- mouse-scroll-min-lines))))
  (let ((opoint (point)))
    (while (progn
             (goto-char (window-start window))
             (if (not (zerop (vertical-motion jump window)))
                 (progn
                   (set-window-start window (point))
                   (if (natnump jump)
                       (if (window-end window)
                           (progn
                             (goto-char (window-end window))
                             ;; window-end doesn't reflect the window's new
                             ;; start position until the next redisplay.
                             (vertical-motion (1- jump) window))
                         (vertical-motion (- (window-height window) 2)))
                     (goto-char (window-start window)))
                   (if overlay
                       (move-overlay overlay start (point)))
                   ;; Now that we have scrolled WINDOW properly,
                   ;; put point back where it was for the redisplay
                   ;; so that we don't mess up the selected window.
                   (or (eq window (selected-window))
                       (goto-char opoint))
                   (sit-for mouse-scroll-delay)))))
    (or (eq window (selected-window))
        (goto-char opoint))))

;; Create an overlay and immediately delete it, to get "overlay in no buffer".
(defconst mouse-drag-overlay
  (let ((ol (make-overlay (point-min) (point-min))))
    (delete-overlay ol)
    (overlay-put ol 'face 'region)
    ol))

(defvar mouse-selection-click-count 0)

(defvar mouse-selection-click-count-buffer nil)

(defun mouse-drag-region (start-event)
  "Set the region to the text that the mouse is dragged over.
Highlight the drag area as you move the mouse.
This must be bound to a button-down mouse event.
In Transient Mark mode, the highlighting remains as long as the mark
remains active.  Otherwise, it remains until the next input event.

If the click is in the echo area, display the `*Messages*' buffer."
  (interactive "e")
  (let ((w (posn-window (event-start start-event))))
    (if (and (window-minibuffer-p w)
             (not (minibuffer-window-active-p w)))
        (save-excursion
          ;; Swallow the up-event.
          (read-event)
          (set-buffer (get-buffer-create "*Messages*"))
          (goto-char (point-max))
          (display-buffer (current-buffer)))
      ;; Give temporary modes such as isearch a chance to turn off.
      (run-hooks 'mouse-leave-buffer-hook)
      (mouse-drag-track start-event t))))


(defun mouse-posn-property (pos property)
  "Look for a property at click position.
POS may be either a buffer position or a click position like
those returned from `event-start'.  If the click position is on
a string, the text property PROPERTY is examined.
If this is nil or the click is not on a string, then
the corresponding buffer position is searched for PROPERTY.
If PROPERTY is encountered in one of those places,
its value is returned."
  (if (consp pos)
      (let ((w (posn-window pos)) (pt (posn-point pos))
            (str (posn-string pos)))
        (or (and str
                 (get-text-property (cdr str) property (car str)))
            (and pt
                 (get-char-property pt property w))))
    (get-char-property pos property)))

(defun mouse-on-link-p (pos)
  "Return non-nil if POS is on a link in the current buffer.
POS must be a buffer position in the current buffer or a mouse
event location in the selected window (see `event-start').
However, if `mouse-1-click-in-non-selected-windows' is non-nil,
POS may be a mouse event location in any window.

A clickable link is identified by one of the following methods:

- If the character at POS has a non-nil `follow-link' text or
overlay property, the value of that property determines what to do.

- If there is a local key-binding or a keybinding at position POS
for the `follow-link' event, the binding of that event determines
what to do.

The resulting value determine whether POS is inside a link:

- If the value is `mouse-face', POS is inside a link if there
is a non-nil `mouse-face' property at POS.  Return t in this case.

- If the value is a function, FUNC, POS is inside a link if
the call \(FUNC POS) returns non-nil.  Return the return value
from that call.  Arg is \(posn-point POS) if POS is a mouse event.

- Otherwise, return the value itself.

The return value is interpreted as follows:

- If it is a string, the mouse-1 event is translated into the
first character of the string, i.e. the action of the mouse-1
click is the local or global binding of that character.

- If it is a vector, the mouse-1 event is translated into the
first element of that vector, i.e. the action of the mouse-1
click is the local or global binding of that event.

- Otherwise, the mouse-1 event is translated into a mouse-2 event
at the same position."
  (let ((action
         (and (or (not (consp pos))
                  mouse-1-click-in-non-selected-windows
                  (eq (selected-window) (posn-window pos)))
              (or (mouse-posn-property pos 'follow-link)
                  (key-binding [follow-link] nil t pos)))))
    (cond
     ((eq action 'mouse-face)
      (and (mouse-posn-property pos 'mouse-face) t))
     ((functionp action)
      ;; FIXME: This seems questionable if the click is not in a buffer.
      ;; Should we instead decide that `action' takes a `posn'?
      (if (consp pos)
          (with-current-buffer (window-buffer (posn-window pos))
            (funcall action (posn-point pos)))
        (funcall action pos)))
     (t action))))

(defun mouse-fixup-help-message (msg)
  "Fix help message MSG for `mouse-1-click-follows-link'."
  (let (mp pos)
    (if (and mouse-1-click-follows-link
             (stringp msg)
             (save-match-data
               (string-match "^mouse-2" msg))
             (setq mp (mouse-pixel-position))
             (consp (setq pos (cdr mp)))
             (car pos) (>= (car pos) 0)
             (cdr pos) (>= (cdr pos) 0)
             (setq pos (posn-at-x-y (car pos) (cdr pos) (car mp)))
             (windowp (posn-window pos)))
        (with-current-buffer (window-buffer (posn-window pos))
          (if (mouse-on-link-p pos)
              (setq msg (concat
                    (cond
                     ((eq mouse-1-click-follows-link 'double) "double-")
                     ((and (integerp mouse-1-click-follows-link)
                           (< mouse-1-click-follows-link 0)) "Long ")
                     (t ""))
                    "mouse-1" (substring msg 7)))))))
  msg)

(defun mouse-move-drag-overlay (ol start end mode)
  (unless (= start end)
    ;; Go to START first, so that when we move to END, if it's in the middle
    ;; of intangible text, point jumps in the direction away from START.
    ;; Don't do it if START=END otherwise a single click risks selecting
    ;; a region if it's on intangible text.  This exception was originally
    ;; only applied on entry to mouse-drag-region, which had the problem
    ;; that a tiny move during a single-click would cause the intangible
    ;; text to be selected.
    (goto-char start)
    (goto-char end)
    (setq end (point)))
  (let ((range (mouse-start-end start end mode)))
    (move-overlay ol (car range) (nth 1 range))))

(defun mouse-drag-track (start-event  &optional
                                      do-mouse-drag-region-post-process)
    "Track mouse drags by highlighting area between point and cursor.
The region will be defined with mark and point, and the overlay
will be deleted after return.  DO-MOUSE-DRAG-REGION-POST-PROCESS
should only be used by mouse-drag-region."
  (mouse-minibuffer-check start-event)
  (setq mouse-selection-click-count-buffer (current-buffer))
  ;; We must call deactivate-mark before repositioning point.
  ;; Otherwise, for select-active-regions non-nil, we get the wrong
  ;; selection if the user drags a region, clicks elsewhere to
  ;; reposition point, then middle-clicks to paste the selection.
  (deactivate-mark)
  (let* ((original-window (selected-window))
         ;; We've recorded what we needed from the current buffer and
         ;; window, now let's jump to the place of the event, where things
         ;; are happening.
         (_ (mouse-set-point start-event))
         (echo-keystrokes 0)
         (start-posn (event-start start-event))
         (start-point (posn-point start-posn))
         (start-window (posn-window start-posn))
         (start-window-start (window-start start-window))
         (start-hscroll (window-hscroll start-window))
         (bounds (window-edges start-window))
         (make-cursor-line-fully-visible nil)
         (top (nth 1 bounds))
         (bottom (if (window-minibuffer-p start-window)
                     (nth 3 bounds)
                   ;; Don't count the mode line.
                   (1- (nth 3 bounds))))
         (on-link (and mouse-1-click-follows-link
                       (or mouse-1-click-in-non-selected-windows
                           (eq start-window original-window))
                       ;; Use start-point before the intangibility
                       ;; treatment, in case we click on a link inside an
                       ;; intangible text.
                       (mouse-on-link-p start-posn)))
         (click-count (1- (event-click-count start-event)))
         (remap-double-click (and on-link
                                  (eq mouse-1-click-follows-link 'double)
                                  (= click-count 1)))
         ;; Suppress automatic hscrolling, because that is a nuisance
         ;; when setting point near the right fringe (but see below).
         (automatic-hscrolling-saved automatic-hscrolling)
         (automatic-hscrolling nil))
    (setq mouse-selection-click-count click-count)
    ;; In case the down click is in the middle of some intangible text,
    ;; use the end of that text, and put it in START-POINT.
    (if (< (point) start-point)
        (goto-char start-point))
    (setq start-point (point))
    (if remap-double-click ;; Don't expand mouse overlay in links
        (setq click-count 0))
    (mouse-move-drag-overlay mouse-drag-overlay start-point start-point
                             click-count)
    (overlay-put mouse-drag-overlay 'window start-window)
    (let (event end end-point last-end-point)
      (track-mouse
        (while (progn
                 (setq event (read-event))
                 (or (mouse-movement-p event)
                     (memq (car-safe event) '(switch-frame select-window))))
          (if (memq (car-safe event) '(switch-frame select-window))
              nil
            ;; Automatic hscrolling did not occur during the call to
            ;; `read-event'; but if the user subsequently drags the
            ;; mouse, go ahead and hscroll.
            (let ((automatic-hscrolling automatic-hscrolling-saved))
              (redisplay))
            (setq end (event-end event)
                  end-point (posn-point end))
            (if (numberp end-point)
                (setq last-end-point end-point))

            (cond
             ;; Are we moving within the original window?
             ((and (eq (posn-window end) start-window)
                   (integer-or-marker-p end-point))
              (mouse-move-drag-overlay mouse-drag-overlay start-point end-point click-count))

             (t
              (let ((mouse-row (cdr (cdr (mouse-position)))))
                (cond
                 ((null mouse-row))
                 ((< mouse-row top)
                  (mouse-scroll-subr start-window (- mouse-row top)
                                     mouse-drag-overlay start-point))
                 ((>= mouse-row bottom)
                  (mouse-scroll-subr start-window (1+ (- mouse-row bottom))
                                     mouse-drag-overlay start-point)))))))))

      ;; In case we did not get a mouse-motion event
      ;; for the final move of the mouse before a drag event
      ;; pretend that we did get one.
      (when (and (memq 'drag (event-modifiers (car-safe event)))
                 (setq end (event-end event)
                       end-point (posn-point end))
                 (eq (posn-window end) start-window)
                 (integer-or-marker-p end-point))
        (mouse-move-drag-overlay mouse-drag-overlay start-point end-point click-count))

      ;; Handle the terminating event
      (if (consp event)
          (let* ((fun (key-binding (vector (car event))))
                 (do-multi-click   (and (> (event-click-count event) 0)
                                        (functionp fun)
                                        (not (memq fun
                                                   '(mouse-set-point
                                                     mouse-set-region))))))
            ;; Run the binding of the terminating up-event, if possible.
            (if (and (not (= (overlay-start mouse-drag-overlay)
                             (overlay-end mouse-drag-overlay)))
                     (not do-multi-click))
                (let* ((stop-point
                        (if (numberp (posn-point (event-end event)))
                            (posn-point (event-end event))
                          last-end-point))
                       ;; The end that comes from where we ended the drag.
                       ;; Point goes here.
                       (region-termination
                        (if (and stop-point (< stop-point start-point))
                            (overlay-start mouse-drag-overlay)
                          (overlay-end mouse-drag-overlay)))
                       ;; The end that comes from where we started the drag.
                       ;; Mark goes there.
                       (region-commencement
                        (- (+ (overlay-end mouse-drag-overlay)
                              (overlay-start mouse-drag-overlay))
                           region-termination))
                       last-command this-command)
                  ;; We copy the region before setting the mark so
                  ;; that `select-active-regions' can override
                  ;; `copy-region-as-kill'.
                  (and mouse-drag-copy-region
                       do-mouse-drag-region-post-process
                       (let (deactivate-mark)
                         (copy-region-as-kill region-commencement
                                              region-termination)))
                  (push-mark region-commencement t t)
                  (goto-char region-termination)
                  (if (not do-mouse-drag-region-post-process)
                      ;; Skip all post-event handling, return immediately.
                      (delete-overlay mouse-drag-overlay)
                    (let ((buffer (current-buffer)))
                      (mouse-show-mark)
                      ;; mouse-show-mark can call read-event,
                      ;; and that means the Emacs server could switch buffers
                      ;; under us.  If that happened,
                      ;; avoid trying to use the region.
                      (and (mark t) mark-active
                           (eq buffer (current-buffer))
                           (mouse-set-region-1)))))
              ;; Run the binding of the terminating up-event.
              ;; If a multiple click is not bound to mouse-set-point,
              ;; cancel the effects of mouse-move-drag-overlay to
              ;; avoid producing wrong results.
              (if do-multi-click (goto-char start-point))
              (delete-overlay mouse-drag-overlay)
              (when (and (functionp fun)
                         (= start-hscroll (window-hscroll start-window))
                         ;; Don't run the up-event handler if the
                         ;; window start changed in a redisplay after
                         ;; the mouse-set-point for the down-mouse
                         ;; event at the beginning of this function.
                         ;; When the window start has changed, the
                         ;; up-mouse event will contain a different
                         ;; position due to the new window contents,
                         ;; and point is set again.
                         (or end-point
                             (= (window-start start-window)
                                start-window-start)))
                (when (and on-link
                           (or (not end-point) (= end-point start-point))
                           (consp event)
                           (or remap-double-click
                               (and
                                (not (eq mouse-1-click-follows-link 'double))
                                (= click-count 0)
                                (= (event-click-count event) 1)
                                (or (not (integerp mouse-1-click-follows-link))
                                    (let ((t0 (posn-timestamp (event-start start-event)))
                                          (t1 (posn-timestamp (event-end event))))
                                      (and (integerp t0) (integerp t1)
                                           (if (> mouse-1-click-follows-link 0)
                                               (<= (- t1 t0) mouse-1-click-follows-link)
                                             (< (- t0 t1) mouse-1-click-follows-link))))))))
                  ;; If we rebind to mouse-2, reselect previous selected window,
                  ;; so that the mouse-2 event runs in the same
                  ;; situation as if user had clicked it directly.
                  ;; Fixes the bug reported by juri@jurta.org on 2005-12-27.
                  (if (or (vectorp on-link) (stringp on-link))
                      (setq event (aref on-link 0))
                    (select-window original-window)
                    (setcar event 'mouse-2)
                    ;; If this mouse click has never been done by
                    ;; the user, it doesn't have the necessary
                    ;; property to be interpreted correctly.
                    (put 'mouse-2 'event-kind 'mouse-click)))
                (push event unread-command-events))))

        ;; Case where the end-event is not a cons cell (it's just a boring
        ;; char-key-press).
        (delete-overlay mouse-drag-overlay)))))
\f
;; Commands to handle xterm-style multiple clicks.
(defun mouse-skip-word (dir)
  "Skip over word, over whitespace, or over identical punctuation.
If DIR is positive skip forward; if negative, skip backward."
  (let* ((char (following-char))
         (syntax (char-to-string (char-syntax char))))
    (cond ((string= syntax "w")
           ;; Here, we can't use skip-syntax-forward/backward because
           ;; they don't pay attention to word-separating-categories,
           ;; and thus they will skip over a true word boundary.  So,
           ;; we simulate the original behavior by using forward-word.
           (if (< dir 0)
               (if (not (looking-at "\\<"))
                   (forward-word -1))
             (if (or (looking-at "\\<") (not (looking-at "\\>")))
                 (forward-word 1))))
          ((string= syntax " ")
           (if (< dir 0)
               (skip-syntax-backward syntax)
             (skip-syntax-forward syntax)))
          ((string= syntax "_")
           (if (< dir 0)
               (skip-syntax-backward "w_")
             (skip-syntax-forward "w_")))
          ((< dir 0)
           (while (and (not (bobp)) (= (preceding-char) char))
             (forward-char -1)))
          (t
           (while (and (not (eobp)) (= (following-char) char))
             (forward-char 1))))))

(defun mouse-start-end (start end mode)
  "Return a list of region bounds based on START and END according to MODE.
If MODE is 0 then set point to (min START END), mark to (max START END).
If MODE is 1 then set point to start of word at (min START END),
mark to end of word at (max START END).
If MODE is 2 then do the same for lines."
  (if (> start end)
      (let ((temp start))
        (setq start end
              end temp)))
  (setq mode (mod mode 3))
  (cond ((= mode 0)
         (list start end))
        ((and (= mode 1)
              (= start end)
              (char-after start)
              (= (char-syntax (char-after start)) ?\())
         (list start
               (save-excursion
                 (goto-char start)
                 (forward-sexp 1)
                 (point))))
        ((and (= mode 1)
              (= start end)
              (char-after start)
              (= (char-syntax (char-after start)) ?\)))
         (list (save-excursion
                 (goto-char (1+ start))
                 (backward-sexp 1)
                 (point))
               (1+ start)))
        ((and (= mode 1)
              (= start end)
              (char-after start)
              (= (char-syntax (char-after start)) ?\"))
         (let ((open (or (eq start (point-min))
                         (save-excursion
                           (goto-char (- start 1))
                           (looking-at "\\s(\\|\\s \\|\\s>")))))
           (if open
               (list start
                     (save-excursion
                       (condition-case nil
                           (progn
                             (goto-char start)
                             (forward-sexp 1)
                             (point))
                         (error end))))
             (list (save-excursion
                     (condition-case nil
                         (progn
                           (goto-char (1+ start))
                           (backward-sexp 1)
                           (point))
                       (error end)))
                   (1+ start)))))
        ((= mode 1)
         (list (save-excursion
                 (goto-char start)
                 (mouse-skip-word -1)
                 (point))
               (save-excursion
                 (goto-char end)
                 (mouse-skip-word 1)
                 (point))))
        ((= mode 2)
         (list (save-excursion
                 (goto-char start)
                 (beginning-of-line 1)
                 (point))
               (save-excursion
                 (goto-char end)
                 (forward-line 1)
                 (point))))))
\f
;; Subroutine: set the mark where CLICK happened,
;; but don't do anything else.
(defun mouse-set-mark-fast (click)
  (mouse-minibuffer-check click)
  (let ((posn (event-start click)))
    (select-window (posn-window posn))
    (if (numberp (posn-point posn))
        (push-mark (posn-point posn) t t))))

(defun mouse-undouble-last-event (events)
  (let* ((index (1- (length events)))
         (last (nthcdr index events))
         (event (car last))
         (basic (event-basic-type event))
         (old-modifiers (event-modifiers event))
         (modifiers (delq 'double (delq 'triple (copy-sequence old-modifiers))))
         (new
          (if (consp event)
              ;; Use reverse, not nreverse, since event-modifiers
              ;; does not copy the list it returns.
              (cons (event-convert-list (reverse (cons basic modifiers)))
                    (cdr event))
            event)))
    (setcar last new)
    (if (and (not (equal modifiers old-modifiers))
             (key-binding (apply 'vector events)))
        t
      (setcar last event)
      nil)))

;; Momentarily show where the mark is, if highlighting doesn't show it.

(defcustom mouse-region-delete-keys '([delete] [deletechar] [backspace])
  "List of keys that should cause the mouse region to be deleted."
  :group 'mouse
  :type '(repeat key-sequence))

(defun mouse-show-mark ()
  (let ((inhibit-quit t)
        (echo-keystrokes 0)
        event events key ignore
        (x-lost-selection-functions
         (when (boundp 'x-lost-selection-functions)
           (copy-sequence x-lost-selection-functions))))
    (add-hook 'x-lost-selection-functions
              (lambda (seltype)
                (when (eq seltype 'PRIMARY)
                  (setq ignore t)
                  (throw 'mouse-show-mark t))))
    (if transient-mark-mode
        (delete-overlay mouse-drag-overlay)
      (move-overlay mouse-drag-overlay (point) (mark t)))
    (catch 'mouse-show-mark
      ;; In this loop, execute scroll bar and switch-frame events.
      ;; Should we similarly handle `select-window' events?  --Stef
      ;; Also ignore down-events that are undefined.
      (while (progn (setq event (read-event))
                    (setq events (append events (list event)))
                    (setq key (apply 'vector events))
                    (or (and (consp event)
                             (eq (car event) 'switch-frame))
                        (and (consp event)
                             (eq (posn-point (event-end event))
                                 'vertical-scroll-bar))
                        (and (memq 'down (event-modifiers event))
                             (not (key-binding key))
                             (not (mouse-undouble-last-event events))
                             (not (member key mouse-region-delete-keys)))))
        (and (consp event)
             (or (eq (car event) 'switch-frame)
                 (eq (posn-point (event-end event))
                     'vertical-scroll-bar))
             (let ((keys (vector 'vertical-scroll-bar event)))
               (and (key-binding keys)
                    (progn
                      (call-interactively (key-binding keys)
                                          nil keys)
                      (setq events nil)))))))
    ;; If we lost the selection, just turn off the highlighting.
    (unless ignore
      ;; For certain special keys, delete the region.
      (if (member key mouse-region-delete-keys)
          (progn
            ;; Since notionally this is a separate command,
            ;; run all the hooks that would be run if it were
            ;; executed separately.
            (run-hooks 'post-command-hook)
            (setq last-command this-command)
            (setq this-original-command 'delete-region)
            (setq this-command (or (command-remapping this-original-command)
                                   this-original-command))
            (run-hooks 'pre-command-hook)
            (call-interactively this-command))
        ;; Otherwise, unread the key so it gets executed normally.
        (setq unread-command-events
              (nconc events unread-command-events))))
    (setq quit-flag nil)
    (unless transient-mark-mode
      (delete-overlay mouse-drag-overlay))))

(defun mouse-set-mark (click)
  "Set mark at the position clicked on with the mouse.
Display cursor at that position for a second.
This must be bound to a mouse click."
  (interactive "e")
  (mouse-minibuffer-check click)
  (select-window (posn-window (event-start click)))
  ;; We don't use save-excursion because that preserves the mark too.
  (let ((point-save (point)))
    (unwind-protect
        (progn (mouse-set-point click)
               (push-mark nil t t)
               (or transient-mark-mode
                   (sit-for 1)))
      (goto-char point-save))))

(defun mouse-kill (click)
  "Kill the region between point and the mouse click.
The text is saved in the kill ring, as with \\[kill-region]."
  (interactive "e")
  (mouse-minibuffer-check click)
  (let* ((posn (event-start click))
         (click-posn (posn-point posn)))
    (select-window (posn-window posn))
    (if (numberp click-posn)
        (kill-region (min (point) click-posn)
                     (max (point) click-posn)))))

(defun mouse-yank-at-click (click arg)
  "Insert the last stretch of killed text at the position clicked on.
Also move point to one end of the text thus inserted (normally the end),
and set mark at the beginning.
Prefix arguments are interpreted as with \\[yank].
If `mouse-yank-at-point' is non-nil, insert at point
regardless of where you click.
If `select-active-regions' is non-nil, the mark is deactivated
before inserting the text."
  (interactive "e\nP")
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook)
  (when select-active-regions
    ;; Without this, confusing things happen upon e.g. inserting into
    ;; the middle of an active region.
    (deactivate-mark))
  (or mouse-yank-at-point (mouse-set-point click))
  (setq this-command 'yank)
  (setq mouse-selection-click-count 0)
  (yank arg))

(defun mouse-yank-primary (click)
  "Insert the primary selection at the position clicked on.
Move point to the end of the inserted text.
If `mouse-yank-at-point' is non-nil, insert at point
regardless of where you click."
  (interactive "e")
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook)
  (when select-active-regions
    ;; Without this, confusing things happen upon e.g. inserting into
    ;; the middle of an active region.
    (deactivate-mark))
  (or mouse-yank-at-point (mouse-set-point click))
  (let ((primary (x-get-selection 'PRIMARY)))
    (if primary
        (insert (x-get-selection 'PRIMARY))
      (error "No primary selection"))))

(defun mouse-kill-ring-save (click)
  "Copy the region between point and the mouse click in the kill ring.
This does not delete the region; it acts like \\[kill-ring-save]."
  (interactive "e")
  (mouse-set-mark-fast click)
  (let (this-command last-command)
    (kill-ring-save (point) (mark t)))
  (mouse-show-mark))

;; This function used to delete the text between point and the mouse
;; whenever it was equal to the front of the kill ring, but some
;; people found that confusing.

;; A list (TEXT START END), describing the text and position of the last
;; invocation of mouse-save-then-kill.
(defvar mouse-save-then-kill-posn nil)

(defun mouse-save-then-kill-delete-region (beg end)
  ;; We must make our own undo boundaries
  ;; because they happen automatically only for the current buffer.
  (undo-boundary)
  (if (or (= beg end) (eq buffer-undo-list t))
      ;; If we have no undo list in this buffer,
      ;; just delete.
      (delete-region beg end)
    ;; Delete, but make the undo-list entry share with the kill ring.
    ;; First, delete just one char, so in case buffer is being modified
    ;; for the first time, the undo list records that fact.
    (let (before-change-functions after-change-functions)
      (delete-region beg
                     (+ beg (if (> end beg) 1 -1))))
    (let ((buffer-undo-list buffer-undo-list))
      ;; Undo that deletion--but don't change the undo list!
      (let (before-change-functions after-change-functions)
        (primitive-undo 1 buffer-undo-list))
      ;; Now delete the rest of the specified region,
      ;; but don't record it.
      (setq buffer-undo-list t)
      (if (/= (length (car kill-ring)) (- (max end beg) (min end beg)))
          (error "Lossage in mouse-save-then-kill-delete-region"))
      (delete-region beg end))
    (let ((tail buffer-undo-list))
      ;; Search back in buffer-undo-list for the string
      ;; that came from deleting one character.
      (while (and tail (not (stringp (car (car tail)))))
        (setq tail (cdr tail)))
      ;; Replace it with an entry for the entire deleted text.
      (and tail
           (setcar tail (cons (car kill-ring) (min beg end))))))
  (undo-boundary))

(defun mouse-save-then-kill (click)
  "Save text to point in kill ring; the second time, kill the text.
If the text between point and the mouse is the same as what's
at the front of the kill ring, this deletes the text.
Otherwise, it adds the text to the kill ring, like \\[kill-ring-save],
which prepares for a second click to delete the text.

If you have selected words or lines, this command extends the
selection through the word or line clicked on.  If you do this
again in a different position, it extends the selection again.
If you do this twice in the same position, the selection is killed."
  (interactive "e")
  (let ((before-scroll
         (with-current-buffer (window-buffer (posn-window (event-start click)))
           point-before-scroll)))
    (mouse-minibuffer-check click)
    (let ((click-posn (posn-point (event-start click)))
          ;; Don't let a subsequent kill command append to this one:
          ;; prevent setting this-command to kill-region.
          (this-command this-command))
      (if (and (with-current-buffer
                   (window-buffer (posn-window (event-start click)))
                 (and (mark t) (> (mod mouse-selection-click-count 3) 0)
                      ;; Don't be fooled by a recent click in some other buffer.
                      (eq mouse-selection-click-count-buffer
                          (current-buffer)))))
          (if (not (and (eq last-command 'mouse-save-then-kill)
                        (equal click-posn
                               (car (cdr-safe (cdr-safe mouse-save-then-kill-posn))))))
              ;; Find both ends of the object selected by this click.
              (let* ((range
                      (mouse-start-end click-posn click-posn
                                       mouse-selection-click-count)))
                ;; Move whichever end is closer to the click.
                ;; That's what xterm does, and it seems reasonable.
                (if (< (abs (- click-posn (mark t)))
                       (abs (- click-posn (point))))
                    (set-mark (car range))
                  (goto-char (nth 1 range)))
                ;; We have already put the old region in the kill ring.
                ;; Replace it with the extended region.
                ;; (It would be annoying to make a separate entry.)
                (kill-new (buffer-substring (point) (mark t)) t)
                (mouse-set-region-1)
                ;; Arrange for a repeated mouse-3 to kill this region.
                (setq mouse-save-then-kill-posn
                      (list (car kill-ring) (point) click-posn))
                (mouse-show-mark))
            ;; If we click this button again without moving it,
            ;; that time kill.
            (mouse-save-then-kill-delete-region (mark) (point))
            (setq mouse-selection-click-count 0)
            (setq mouse-save-then-kill-posn nil))
        (if (and (eq last-command 'mouse-save-then-kill)
                 mouse-save-then-kill-posn
                 (eq (car mouse-save-then-kill-posn) (car kill-ring))
                 (equal (cdr mouse-save-then-kill-posn) (list (point) click-posn)))
            ;; If this is the second time we've called
            ;; mouse-save-then-kill, delete the text from the buffer.
            (progn
              (mouse-save-then-kill-delete-region (point) (mark))
              ;; After we kill, another click counts as "the first time".
              (setq mouse-save-then-kill-posn nil))
          ;; This is not a repetition.
          ;; We are adjusting an old selection or creating a new one.
          (if (or (and (eq last-command 'mouse-save-then-kill)
                       mouse-save-then-kill-posn)
                  (and mark-active transient-mark-mode)
                  (and (memq last-command
                             '(mouse-drag-region mouse-set-region))
                       (or mark-even-if-inactive
                           (not transient-mark-mode))))
              ;; We have a selection or suitable region, so adjust it.
              (let* ((posn (event-start click))
                     (new (posn-point posn)))
                (select-window (posn-window posn))
                (if (numberp new)
                    (progn
                      ;; Move whichever end of the region is closer to the click.
                      ;; That is what xterm does, and it seems reasonable.
                      (if (<= (abs (- new (point))) (abs (- new (mark t))))
                          (goto-char new)
                        (set-mark new))
                      (setq deactivate-mark nil)))
                (kill-new (buffer-substring (point) (mark t)) t))
            ;; Set the mark where point is, then move where clicked.
            (mouse-set-mark-fast click)
            (if before-scroll
                (goto-char before-scroll))
            (exchange-point-and-mark)   ;Why??? --Stef
            (kill-new (buffer-substring (point) (mark t))))
          (mouse-show-mark)
          (mouse-set-region-1)
          (setq mouse-save-then-kill-posn
                (list (car kill-ring) (point) click-posn)))))))
\f
(global-set-key [M-mouse-1] 'mouse-start-secondary)
(global-set-key [M-drag-mouse-1] 'mouse-set-secondary)
(global-set-key [M-down-mouse-1] 'mouse-drag-secondary)
(global-set-key [M-mouse-3] 'mouse-secondary-save-then-kill)
(global-set-key [M-mouse-2] 'mouse-yank-secondary)

(defconst mouse-secondary-overlay
  (let ((ol (make-overlay (point-min) (point-min))))
    (delete-overlay ol)
    (overlay-put ol 'face 'secondary-selection)
    ol)
  "An overlay which records the current secondary selection.
It is deleted when there is no secondary selection.")

(defvar mouse-secondary-click-count 0)

;; A marker which records the specified first end for a secondary selection.
;; May be nil.
(defvar mouse-secondary-start nil)

(defun mouse-start-secondary (click)
  "Set one end of the secondary selection to the position clicked on.
Use \\[mouse-secondary-save-then-kill] to set the other end
and complete the secondary selection."
  (interactive "e")
  (mouse-minibuffer-check click)
  (let ((posn (event-start click)))
    (with-current-buffer (window-buffer (posn-window posn))
      ;; Cancel any preexisting secondary selection.
      (delete-overlay mouse-secondary-overlay)
      (if (numberp (posn-point posn))
          (progn
            (or mouse-secondary-start
                (setq mouse-secondary-start (make-marker)))
            (move-marker mouse-secondary-start (posn-point posn)))))))

(defun mouse-set-secondary (click)
  "Set the secondary selection to the text that the mouse is dragged over.
This must be bound to a mouse drag event."
  (interactive "e")
  (mouse-minibuffer-check click)
  (let ((posn (event-start click))
        beg
        (end (event-end click)))
    (with-current-buffer (window-buffer (posn-window posn))
      (if (numberp (posn-point posn))
          (setq beg (posn-point posn)))
      (move-overlay mouse-secondary-overlay beg (posn-point end))
      (x-set-selection
       'SECONDARY
       (buffer-substring (overlay-start mouse-secondary-overlay)
                         (overlay-end mouse-secondary-overlay))))))

(defun mouse-drag-secondary (start-event)
  "Set the secondary selection to the text that the mouse is dragged over.
Highlight the drag area as you move the mouse.
This must be bound to a button-down mouse event.
The function returns a non-nil value if it creates a secondary selection."
  (interactive "e")
  (mouse-minibuffer-check start-event)
  (let* ((echo-keystrokes 0)
         (start-posn (event-start start-event))
         (start-point (posn-point start-posn))
         (start-window (posn-window start-posn))
         (bounds (window-edges start-window))
         (top (nth 1 bounds))
         (bottom (if (window-minibuffer-p start-window)
                     (nth 3 bounds)
                   ;; Don't count the mode line.
                   (1- (nth 3 bounds))))
         (click-count (1- (event-click-count start-event))))
    (with-current-buffer (window-buffer start-window)
      (setq mouse-secondary-click-count click-count)
      (if (> (mod click-count 3) 0)
          ;; Double or triple press: make an initial selection
          ;; of one word or line.
          (let ((range (mouse-start-end start-point start-point click-count)))
            (set-marker mouse-secondary-start nil)
            ;; Why the double move?  --Stef
            ;; (move-overlay mouse-secondary-overlay 1 1
            ;;            (window-buffer start-window))
            (move-overlay mouse-secondary-overlay (car range) (nth 1 range)
                          (window-buffer start-window)))
        ;; Single-press: cancel any preexisting secondary selection.
        (or mouse-secondary-start
            (setq mouse-secondary-start (make-marker)))
        (set-marker mouse-secondary-start start-point)
        (delete-overlay mouse-secondary-overlay))
      (let (event end end-point)
        (track-mouse
          (while (progn
                   (setq event (read-event))
                   (or (mouse-movement-p event)
                       (memq (car-safe event) '(switch-frame select-window))))

            (if (memq (car-safe event) '(switch-frame select-window))
                nil
              (setq end (event-end event)
                    end-point (posn-point end))
              (cond
               ;; Are we moving within the original window?
               ((and (eq (posn-window end) start-window)
                     (integer-or-marker-p end-point))
                (let ((range (mouse-start-end start-point end-point
                                              click-count)))
                  (if (or (/= start-point end-point)
                          (null (marker-position mouse-secondary-start)))
                      (progn
                        (set-marker mouse-secondary-start nil)
                        (move-overlay mouse-secondary-overlay
                                      (car range) (nth 1 range))))))
               (t
                (let ((mouse-row (cdr (cdr (mouse-position)))))
                  (cond
                   ((null mouse-row))
                   ((< mouse-row top)
                    (mouse-scroll-subr start-window (- mouse-row top)
                                       mouse-secondary-overlay start-point))
                   ((>= mouse-row bottom)
                    (mouse-scroll-subr start-window (1+ (- mouse-row bottom))
                                       mouse-secondary-overlay start-point)))))))))

        (if (consp event)
            (if (marker-position mouse-secondary-start)
                (save-window-excursion
                  (delete-overlay mouse-secondary-overlay)
                  (x-set-selection 'SECONDARY nil)
                  (select-window start-window)
                  (save-excursion
                    (goto-char mouse-secondary-start)
                    (sit-for 1)
                    nil))
              (x-set-selection
               'SECONDARY
               (buffer-substring (overlay-start mouse-secondary-overlay)
                                 (overlay-end mouse-secondary-overlay)))))))))

(defun mouse-yank-secondary (click)
  "Insert the secondary selection at the position clicked on.
Move point to the end of the inserted text.
If `mouse-yank-at-point' is non-nil, insert at point
regardless of where you click."
  (interactive "e")
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook)
  (or mouse-yank-at-point (mouse-set-point click))
  (let ((secondary (x-get-selection 'SECONDARY)))
    (if secondary
        (insert (x-get-selection 'SECONDARY))
      (error "No secondary selection"))))

(defun mouse-kill-secondary ()
  "Kill the text in the secondary selection.
This is intended more as a keyboard command than as a mouse command
but it can work as either one.

The current buffer (in case of keyboard use), or the buffer clicked on,
must be the one that the secondary selection is in.  This requirement
is to prevent accidents."
  (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")))
  (let (this-command)
    (with-current-buffer (overlay-buffer mouse-secondary-overlay)
      (kill-region (overlay-start mouse-secondary-overlay)
                   (overlay-end mouse-secondary-overlay))))
  (delete-overlay mouse-secondary-overlay))

(defun mouse-secondary-save-then-kill (click)
  "Save text to point in kill ring; the second time, kill the text.
You must use this in a buffer where you have recently done \\[mouse-start-secondary].
If the text between where you did \\[mouse-start-secondary] and where
you use this command matches the text at the front of the kill ring,
this command deletes the text.
Otherwise, it adds the text to the kill ring, like \\[kill-ring-save],
which prepares for a second click with this command to delete the text.

If you have already made a secondary selection in that buffer,
this command extends or retracts the selection to where you click.
If you do this again in a different position, it extends or retracts
again.  If you do this twice in the same position, it kills the selection."
  (interactive "e")
  (mouse-minibuffer-check click)
  (let ((posn (event-start click))
        (click-posn (posn-point (event-start click)))
        ;; Don't let a subsequent kill command append to this one:
        ;; prevent setting this-command to kill-region.
        (this-command this-command))
    (or (eq (window-buffer (posn-window posn))
            (or (overlay-buffer mouse-secondary-overlay)
                (if mouse-secondary-start
                    (marker-buffer mouse-secondary-start))))
        (error "Wrong buffer"))
    (with-current-buffer (window-buffer (posn-window posn))
      (if (> (mod mouse-secondary-click-count 3) 0)
          (if (not (and (eq last-command 'mouse-secondary-save-then-kill)
                        (equal click-posn
                               (car (cdr-safe (cdr-safe mouse-save-then-kill-posn))))))
              ;; Find both ends of the object selected by this click.
              (let* ((range
                      (mouse-start-end click-posn click-posn
                                       mouse-secondary-click-count)))
                ;; Move whichever end is closer to the click.
                ;; That's what xterm does, and it seems reasonable.
                (if (< (abs (- click-posn (overlay-start mouse-secondary-overlay)))
                       (abs (- click-posn (overlay-end mouse-secondary-overlay))))
                    (move-overlay mouse-secondary-overlay (car range)
                                  (overlay-end mouse-secondary-overlay))
                  (move-overlay mouse-secondary-overlay
                                (overlay-start mouse-secondary-overlay)
                                (nth 1 range)))
                ;; We have already put the old region in the kill ring.
                ;; Replace it with the extended region.
                ;; (It would be annoying to make a separate entry.)
                (kill-new (buffer-substring
                           (overlay-start mouse-secondary-overlay)
                           (overlay-end mouse-secondary-overlay)) t)
                ;; Arrange for a repeated mouse-3 to kill this region.
                (setq mouse-save-then-kill-posn
                      (list (car kill-ring) (point) click-posn)))
            ;; If we click this button again without moving it,
            ;; that time kill.
            (progn
              (mouse-save-then-kill-delete-region
               (overlay-start mouse-secondary-overlay)
               (overlay-end mouse-secondary-overlay))
              (setq mouse-save-then-kill-posn nil)
              (setq mouse-secondary-click-count 0)
              (delete-overlay mouse-secondary-overlay)))
        (if (and (eq last-command 'mouse-secondary-save-then-kill)
                 mouse-save-then-kill-posn
                 (eq (car mouse-save-then-kill-posn) (car kill-ring))
                 (equal (cdr mouse-save-then-kill-posn) (list (point) click-posn)))
            ;; If this is the second time we've called
            ;; mouse-secondary-save-then-kill, delete the text from the buffer.
            (progn
              (mouse-save-then-kill-delete-region
               (overlay-start mouse-secondary-overlay)
               (overlay-end mouse-secondary-overlay))
              (setq mouse-save-then-kill-posn nil)
              (delete-overlay mouse-secondary-overlay))
          (if (overlay-start mouse-secondary-overlay)
              ;; We have a selection, so adjust it.
              (progn
                (if (numberp click-posn)
                    (progn
                      ;; Move whichever end of the region is closer to the click.
                      ;; That is what xterm does, and it seems reasonable.
                      (if (< (abs (- click-posn (overlay-start mouse-secondary-overlay)))
                             (abs (- click-posn (overlay-end mouse-secondary-overlay))))
                          (move-overlay mouse-secondary-overlay click-posn
                                        (overlay-end mouse-secondary-overlay))
                        (move-overlay mouse-secondary-overlay
                                      (overlay-start mouse-secondary-overlay)
                                      click-posn))
                      (setq deactivate-mark nil)))
                (if (eq last-command 'mouse-secondary-save-then-kill)
                    ;; If the front of the kill ring comes from
                    ;; an immediately previous use of this command,
                    ;; replace it with the extended region.
                    ;; (It would be annoying to make a separate entry.)
                    (kill-new (buffer-substring
                               (overlay-start mouse-secondary-overlay)
                               (overlay-end mouse-secondary-overlay)) t)
                  (let (deactivate-mark)
                    (copy-region-as-kill (overlay-start mouse-secondary-overlay)
                                         (overlay-end mouse-secondary-overlay)))))
            (if mouse-secondary-start
                ;; All we have is one end of a selection,
                ;; so put the other end here.
                (let ((start (+ 0 mouse-secondary-start)))
                  (kill-ring-save start click-posn)
                  (move-overlay mouse-secondary-overlay start click-posn))))
          (setq mouse-save-then-kill-posn
                (list (car kill-ring) (point) click-posn))))
      (if (overlay-buffer mouse-secondary-overlay)
          (x-set-selection 'SECONDARY
                           (buffer-substring
                            (overlay-start mouse-secondary-overlay)
                            (overlay-end mouse-secondary-overlay)))))))
\f
(defcustom mouse-buffer-menu-maxlen 20
  "Number of buffers in one pane (submenu) of the buffer menu.
If we have lots of buffers, divide them into groups of
`mouse-buffer-menu-maxlen' and make a pane (or submenu) for each one."
  :type 'integer
  :group 'mouse)

(defcustom mouse-buffer-menu-mode-mult 4
  "Group the buffers by the major mode groups on \\[mouse-buffer-menu]?
This number which determines (in a hairy way) whether \\[mouse-buffer-menu]
will split the buffer menu by the major modes (see
`mouse-buffer-menu-mode-groups') or just by menu length.
Set to 1 (or even 0!) if you want to group by major mode always, and to
a large number if you prefer a mixed multitude.  The default is 4."
  :type 'integer
  :group 'mouse
  :version "20.3")

(defvar mouse-buffer-menu-mode-groups
  '(("Info\\|Help\\|Apropos\\|Man" . "Help")
    ("\\bVM\\b\\|\\bMH\\b\\|Message\\|Mail\\|Group\\|Score\\|Summary\\|Article"
     . "Mail/News")
    ("\\<C\\>" . "C")
    ("ObjC" . "C")
    ("Text" . "Text")
    ("Outline" . "Text")
    ("\\(HT\\|SG\\|X\\|XHT\\)ML" . "SGML")
    ("log\\|diff\\|vc\\|cvs\\|Annotate" . "Version Control") ; "Change Management"?
    ("Lisp" . "Lisp"))
  "How to group various major modes together in \\[mouse-buffer-menu].
Each element has the form (REGEXP . GROUPNAME).
If the major mode's name string matches REGEXP, use GROUPNAME instead.")

(defun mouse-buffer-menu (event)
  "Pop up a menu of buffers for selection with the mouse.
This switches buffers in the window that you clicked on,
and selects that window."
  (interactive "e")
  (mouse-minibuffer-check event)
  (let ((buffers (buffer-list))  alist menu split-by-major-mode sum-of-squares)
    ;; Make an alist of elements that look like (MENU-ITEM . BUFFER).
    (dolist (buf buffers)
      ;; Divide all buffers into buckets for various major modes.
      ;; Each bucket looks like (MODE NAMESTRING BUFFERS...).
      (with-current-buffer buf
        (let* ((adjusted-major-mode major-mode) elt)
          (dolist (group mouse-buffer-menu-mode-groups)
            (when (string-match (car group) (format-mode-line mode-name))
              (setq adjusted-major-mode (cdr group))))
          (setq elt (assoc adjusted-major-mode split-by-major-mode))
          (unless elt
            (setq elt (list adjusted-major-mode
                            (if (stringp adjusted-major-mode)
                                adjusted-major-mode
                              (format-mode-line mode-name nil nil buf)))
                  split-by-major-mode (cons elt split-by-major-mode)))
          (or (memq buf (cdr (cdr elt)))
              (setcdr (cdr elt) (cons buf (cdr (cdr elt))))))))
    ;; Compute the sum of squares of sizes of the major-mode buckets.
    (let ((tail split-by-major-mode))
      (setq sum-of-squares 0)
      (while tail
        (setq sum-of-squares
              (+ sum-of-squares
                 (let ((len (length (cdr (cdr (car tail)))))) (* len len))))
        (setq tail (cdr tail))))
    (if (< (* sum-of-squares mouse-buffer-menu-mode-mult)
           (* (length buffers) (length buffers)))
        ;; Subdividing by major modes really helps, so let's do it.
        (let (subdivided-menus (buffers-left (length buffers)))
          ;; Sort the list to put the most popular major modes first.
          (setq split-by-major-mode
                (sort split-by-major-mode
                      (function (lambda (elt1 elt2)
                                  (> (length elt1) (length elt2))))))
          ;; Make a separate submenu for each major mode
          ;; that has more than one buffer,
          ;; unless all the remaining buffers are less than 1/10 of them.
          (while (and split-by-major-mode
                      (and (> (length (car split-by-major-mode)) 3)
                           (> (* buffers-left 10) (length buffers))))
            (let ((this-mode-list (mouse-buffer-menu-alist
                                   (cdr (cdr (car split-by-major-mode))))))
              (and this-mode-list
                   (setq subdivided-menus
                         (cons (cons
                                (nth 1 (car split-by-major-mode))
                                this-mode-list)
                               subdivided-menus))))
            (setq buffers-left
                  (- buffers-left (length (cdr (car split-by-major-mode)))))
            (setq split-by-major-mode (cdr split-by-major-mode)))
          ;; If any major modes are left over,
          ;; make a single submenu for them.
          (if split-by-major-mode
              (let ((others-list
                     (mouse-buffer-menu-alist
                      ;; we don't need split-by-major-mode any more,
                      ;; so we can ditch it with nconc.
                      (apply 'nconc (mapcar 'cddr split-by-major-mode)))))
                (and others-list
                     (setq subdivided-menus
                           (cons (cons "Others" others-list)
                                 subdivided-menus)))))
          (setq menu (cons "Buffer Menu" (nreverse subdivided-menus))))
      (progn
        (setq alist (mouse-buffer-menu-alist buffers))
        (setq menu (cons "Buffer Menu"
                         (mouse-buffer-menu-split "Select Buffer" alist)))))
    (let ((buf (x-popup-menu event menu))
          (window (posn-window (event-start event))))
      (when buf
        (select-window
         (if (framep window) (frame-selected-window window)
           window))
        (switch-to-buffer buf)))))

(defun mouse-buffer-menu-alist (buffers)
  (let (tail
        (maxlen 0)
        head)
    (setq buffers
          (sort buffers
                (function (lambda (elt1 elt2)
                            (string< (buffer-name elt1) (buffer-name elt2))))))
    (setq tail buffers)
    (while tail
      (or (eq ?\s (aref (buffer-name (car tail)) 0))
          (setq maxlen
                (max maxlen
                     (length (buffer-name (car tail))))))
      (setq tail (cdr tail)))
    (setq tail buffers)
    (while tail
      (let ((elt (car tail)))
        (if (/= (aref (buffer-name elt) 0) ?\s)
            (setq head
                  (cons
                   (cons
                    (format
                     (format "%%-%ds  %%s%%s  %%s" maxlen)
                     (buffer-name elt)
                     (if (buffer-modified-p elt) "*" " ")
                     (save-excursion
                       (set-buffer elt)
                       (if buffer-read-only "%" " "))
                     (or (buffer-file-name elt)
                         (save-excursion
                           (set-buffer elt)
                           (if list-buffers-directory
                               (expand-file-name
                                list-buffers-directory)))
                         ""))
                    elt)
                   head))))
      (setq tail (cdr tail)))
    ;; Compensate for the reversal that the above loop does.
    (nreverse head)))

(defun mouse-buffer-menu-split (title alist)
  ;; If we have lots of buffers, divide them into groups of 20
  ;; and make a pane (or submenu) for each one.
  (if (> (length alist) (/ (* mouse-buffer-menu-maxlen 3) 2))
      (let ((alist alist) sublists next
            (i 1))
        (while alist
          ;; Pull off the next mouse-buffer-menu-maxlen buffers
          ;; and make them the next element of sublist.
          (setq next (nthcdr mouse-buffer-menu-maxlen alist))
          (if next
              (setcdr (nthcdr (1- mouse-buffer-menu-maxlen) alist)
                      nil))
          (setq sublists (cons (cons (format "Buffers %d" i) alist)
                               sublists))
          (setq i (1+ i))
          (setq alist next))
        (nreverse sublists))
    ;; Few buffers--put them all in one pane.
    (list (cons title alist))))
\f
;; These need to be rewritten for the new scroll bar implementation.

;;!! ;; Commands for the scroll bar.
;;!!
;;!! (defun mouse-scroll-down (click)
;;!!   (interactive "@e")
;;!!   (scroll-down (1+ (cdr (mouse-coords click)))))
;;!!
;;!! (defun mouse-scroll-up (click)
;;!!   (interactive "@e")
;;!!   (scroll-up (1+ (cdr (mouse-coords click)))))
;;!!
;;!! (defun mouse-scroll-down-full ()
;;!!   (interactive "@")
;;!!   (scroll-down nil))
;;!!
;;!! (defun mouse-scroll-up-full ()
;;!!   (interactive "@")
;;!!   (scroll-up nil))
;;!!
;;!! (defun mouse-scroll-move-cursor (click)
;;!!   (interactive "@e")
;;!!   (move-to-window-line (1+ (cdr (mouse-coords click)))))
;;!!
;;!! (defun mouse-scroll-absolute (event)
;;!!   (interactive "@e")
;;!!   (let* ((pos (car event))
;;!!     (position (car pos))
;;!!     (length (car (cdr pos))))
;;!!     (if (<= length 0) (setq length 1))
;;!!     (let* ((scale-factor (max 1 (/ length (/ 8000000 (buffer-size)))))
;;!!       (newpos (* (/ (* (/ (buffer-size) scale-factor)
;;!!                        position)
;;!!                     length)
;;!!                  scale-factor)))
;;!!       (goto-char newpos)
;;!!       (recenter '(4)))))
;;!!
;;!! (defun mouse-scroll-left (click)
;;!!   (interactive "@e")
;;!!   (scroll-left (1+ (car (mouse-coords click)))))
;;!!
;;!! (defun mouse-scroll-right (click)
;;!!   (interactive "@e")
;;!!   (scroll-right (1+ (car (mouse-coords click)))))
;;!!
;;!! (defun mouse-scroll-left-full ()
;;!!   (interactive "@")
;;!!   (scroll-left nil))
;;!!
;;!! (defun mouse-scroll-right-full ()
;;!!   (interactive "@")
;;!!   (scroll-right nil))
;;!!
;;!! (defun mouse-scroll-move-cursor-horizontally (click)
;;!!   (interactive "@e")
;;!!   (move-to-column (1+ (car (mouse-coords click)))))
;;!!
;;!! (defun mouse-scroll-absolute-horizontally (event)
;;!!   (interactive "@e")
;;!!   (let* ((pos (car event))
;;!!     (position (car pos))
;;!!     (length (car (cdr pos))))
;;!!   (set-window-hscroll (selected-window) 33)))
;;!!
;;!! (global-set-key [scroll-bar mouse-1] 'mouse-scroll-up)
;;!! (global-set-key [scroll-bar mouse-2] 'mouse-scroll-absolute)
;;!! (global-set-key [scroll-bar mouse-3] 'mouse-scroll-down)
;;!!
;;!! (global-set-key [vertical-slider mouse-1] 'mouse-scroll-move-cursor)
;;!! (global-set-key [vertical-slider mouse-2] 'mouse-scroll-move-cursor)
;;!! (global-set-key [vertical-slider mouse-3] 'mouse-scroll-move-cursor)
;;!!
;;!! (global-set-key [thumbup mouse-1] 'mouse-scroll-up-full)
;;!! (global-set-key [thumbup mouse-2] 'mouse-scroll-up-full)
;;!! (global-set-key [thumbup mouse-3] 'mouse-scroll-up-full)
;;!!
;;!! (global-set-key [thumbdown mouse-1] 'mouse-scroll-down-full)
;;!! (global-set-key [thumbdown mouse-2] 'mouse-scroll-down-full)
;;!! (global-set-key [thumbdown mouse-3] 'mouse-scroll-down-full)
;;!!
;;!! (global-set-key [horizontal-scroll-bar mouse-1] 'mouse-scroll-left)
;;!! (global-set-key [horizontal-scroll-bar mouse-2]
;;!!            'mouse-scroll-absolute-horizontally)
;;!! (global-set-key [horizontal-scroll-bar mouse-3] 'mouse-scroll-right)
;;!!
;;!! (global-set-key [horizontal-slider mouse-1]
;;!!            'mouse-scroll-move-cursor-horizontally)
;;!! (global-set-key [horizontal-slider mouse-2]
;;!!            'mouse-scroll-move-cursor-horizontally)
;;!! (global-set-key [horizontal-slider mouse-3]
;;!!            'mouse-scroll-move-cursor-horizontally)
;;!!
;;!! (global-set-key [thumbleft mouse-1] 'mouse-scroll-left-full)
;;!! (global-set-key [thumbleft mouse-2] 'mouse-scroll-left-full)
;;!! (global-set-key [thumbleft mouse-3] 'mouse-scroll-left-full)
;;!!
;;!! (global-set-key [thumbright mouse-1] 'mouse-scroll-right-full)
;;!! (global-set-key [thumbright mouse-2] 'mouse-scroll-right-full)
;;!! (global-set-key [thumbright mouse-3] 'mouse-scroll-right-full)
;;!!
;;!! (global-set-key [horizontal-scroll-bar S-mouse-2]
;;!!            'mouse-split-window-horizontally)
;;!! (global-set-key [mode-line S-mouse-2]
;;!!            'mouse-split-window-horizontally)
;;!! (global-set-key [vertical-scroll-bar S-mouse-2]
;;!!            'mouse-split-window)
\f
;;!! ;;;;
;;!! ;;;; Here are experimental things being tested.  Mouse events
;;!! ;;;; are of the form:
;;!! ;;;;       ((x y) window screen-part key-sequence timestamp)
;;!! ;;
;;!! ;;;;
;;!! ;;;; Dynamically track mouse coordinates
;;!! ;;;;
;;!! ;;
;;!! ;;(defun track-mouse (event)
;;!! ;;  "Track the coordinates, absolute and relative, of the mouse."
;;!! ;;  (interactive "@e")
;;!! ;;  (while mouse-grabbed
;;!! ;;    (let* ((pos (read-mouse-position (selected-screen)))
;;!! ;;    (abs-x (car pos))
;;!! ;;    (abs-y (cdr pos))
;;!! ;;    (relative-coordinate (coordinates-in-window-p
;;!! ;;                          (list (car pos) (cdr pos))
;;!! ;;                          (selected-window))))
;;!! ;;      (if (consp relative-coordinate)
;;!! ;;   (message "mouse: [%d %d], (%d %d)" abs-x abs-y
;;!! ;;            (car relative-coordinate)
;;!! ;;            (car (cdr relative-coordinate)))
;;!! ;; (message "mouse: [%d %d]" abs-x abs-y)))))
;;!!
;;!! ;;
;;!! ;; Dynamically put a box around the line indicated by point
;;!! ;;
;;!! ;;
;;!! ;;(require 'backquote)
;;!! ;;
;;!! ;;(defun mouse-select-buffer-line (event)
;;!! ;;  (interactive "@e")
;;!! ;;  (let ((relative-coordinate
;;!! ;;  (coordinates-in-window-p (car event) (selected-window)))
;;!! ;; (abs-y (car (cdr (car event)))))
;;!! ;;    (if (consp relative-coordinate)
;;!! ;; (progn
;;!! ;;   (save-excursion
;;!! ;;     (move-to-window-line (car (cdr relative-coordinate)))
;;!! ;;     (x-draw-rectangle
;;!! ;;      (selected-screen)
;;!! ;;      abs-y 0
;;!! ;;      (save-excursion
;;!! ;;          (move-to-window-line (car (cdr relative-coordinate)))
;;!! ;;          (end-of-line)
;;!! ;;          (push-mark nil t)
;;!! ;;          (beginning-of-line)
;;!! ;;          (- (region-end) (region-beginning))) 1))
;;!! ;;   (sit-for 1)
;;!! ;;   (x-erase-rectangle (selected-screen))))))
;;!! ;;
;;!! ;;(defvar last-line-drawn nil)
;;!! ;;(defvar begin-delim "[^ \t]")
;;!! ;;(defvar end-delim   "[^ \t]")
;;!! ;;
;;!! ;;(defun mouse-boxing (event)
;;!! ;;  (interactive "@e")
;;!! ;;  (save-excursion
;;!! ;;    (let ((screen (selected-screen)))
;;!! ;;      (while (= (x-mouse-events) 0)
;;!! ;; (let* ((pos (read-mouse-position screen))
;;!! ;;        (abs-x (car pos))
;;!! ;;        (abs-y (cdr pos))
;;!! ;;        (relative-coordinate
;;!! ;;         (coordinates-in-window-p `(,abs-x ,abs-y)
;;!! ;;                                  (selected-window)))
;;!! ;;        (begin-reg nil)
;;!! ;;        (end-reg nil)
;;!! ;;        (end-column nil)
;;!! ;;        (begin-column nil))
;;!! ;;   (if (and (consp relative-coordinate)
;;!! ;;            (or (not last-line-drawn)
;;!! ;;                (not (= last-line-drawn abs-y))))
;;!! ;;       (progn
;;!! ;;         (move-to-window-line (car (cdr relative-coordinate)))
;;!! ;;         (if (= (following-char) 10)
;;!! ;;             ()
;;!! ;;           (progn
;;!! ;;             (setq begin-reg (1- (re-search-forward end-delim)))
;;!! ;;             (setq begin-column (1- (current-column)))
;;!! ;;             (end-of-line)
;;!! ;;             (setq end-reg (1+ (re-search-backward begin-delim)))
;;!! ;;             (setq end-column (1+ (current-column)))
;;!! ;;             (message "%s" (buffer-substring begin-reg end-reg))
;;!! ;;             (x-draw-rectangle screen
;;!! ;;                               (setq last-line-drawn abs-y)
;;!! ;;                               begin-column
;;!! ;;                               (- end-column begin-column) 1))))))))))
;;!! ;;
;;!! ;;(defun mouse-erase-box ()
;;!! ;;  (interactive)
;;!! ;;  (if last-line-drawn
;;!! ;;      (progn
;;!! ;; (x-erase-rectangle (selected-screen))
;;!! ;; (setq last-line-drawn nil))))
;;!!
;;!! ;;; (defun test-x-rectangle ()
;;!! ;;;   (use-local-mouse-map (setq rectangle-test-map (make-sparse-keymap)))
;;!! ;;;   (define-key rectangle-test-map mouse-motion-button-left 'mouse-boxing)
;;!! ;;;   (define-key rectangle-test-map mouse-button-left-up 'mouse-erase-box))
;;!!
;;!! ;;
;;!! ;; Here is how to do double clicking in lisp.  About to change.
;;!! ;;
;;!!
;;!! (defvar double-start nil)
;;!! (defconst double-click-interval 300
;;!!   "Max ticks between clicks")
;;!!
;;!! (defun double-down (event)
;;!!   (interactive "@e")
;;!!   (if double-start
;;!!       (let ((interval (- (nth 4 event) double-start)))
;;!!    (if (< interval double-click-interval)
;;!!        (progn
;;!!          (backward-up-list 1)
;;!!          ;;      (message "Interval %d" interval)
;;!!          (sleep-for 1)))
;;!!    (setq double-start nil))
;;!!     (setq double-start (nth 4 event))))
;;!!
;;!! (defun double-up (event)
;;!!   (interactive "@e")
;;!!   (and double-start
;;!!        (> (- (nth 4 event ) double-start) double-click-interval)
;;!!        (setq double-start nil)))
;;!!
;;!! ;;; (defun x-test-doubleclick ()
;;!! ;;;   (use-local-mouse-map (setq doubleclick-test-map (make-sparse-keymap)))
;;!! ;;;   (define-key doubleclick-test-map mouse-button-left 'double-down)
;;!! ;;;   (define-key doubleclick-test-map mouse-button-left-up 'double-up))
;;!!
;;!! ;;
;;!! ;; This scrolls while button is depressed.  Use preferable in scroll bar.
;;!! ;;
;;!!
;;!! (defvar scrolled-lines 0)
;;!! (defconst scroll-speed 1)
;;!!
;;!! (defun incr-scroll-down (event)
;;!!   (interactive "@e")
;;!!   (setq scrolled-lines 0)
;;!!   (incremental-scroll scroll-speed))
;;!!
;;!! (defun incr-scroll-up (event)
;;!!   (interactive "@e")
;;!!   (setq scrolled-lines 0)
;;!!   (incremental-scroll (- scroll-speed)))
;;!!
;;!! (defun incremental-scroll (n)
;;!!   (while (= (x-mouse-events) 0)
;;!!     (setq scrolled-lines (1+ (* scroll-speed scrolled-lines)))
;;!!     (scroll-down n)
;;!!     (sit-for 300 t)))
;;!!
;;!! (defun incr-scroll-stop (event)
;;!!   (interactive "@e")
;;!!   (message "Scrolled %d lines" scrolled-lines)
;;!!   (setq scrolled-lines 0)
;;!!   (sleep-for 1))
;;!!
;;!! ;;; (defun x-testing-scroll ()
;;!! ;;;   (let ((scrolling-map (function mouse-vertical-scroll-bar-prefix)))
;;!! ;;;     (define-key scrolling-map mouse-button-left 'incr-scroll-down)
;;!! ;;;     (define-key scrolling-map mouse-button-right 'incr-scroll-up)
;;!! ;;;     (define-key scrolling-map mouse-button-left-up 'incr-scroll-stop)
;;!! ;;;     (define-key scrolling-map mouse-button-right-up 'incr-scroll-stop)))
;;!!
;;!! ;;
;;!! ;; Some playthings suitable for picture mode?  They need work.
;;!! ;;
;;!!
;;!! (defun mouse-kill-rectangle (event)
;;!!   "Kill the rectangle between point and the mouse cursor."
;;!!   (interactive "@e")
;;!!   (let ((point-save (point)))
;;!!     (save-excursion
;;!!       (mouse-set-point event)
;;!!       (push-mark nil t)
;;!!       (if (> point-save (point))
;;!!      (kill-rectangle (point) point-save)
;;!!    (kill-rectangle point-save (point))))))
;;!!
;;!! (defun mouse-open-rectangle (event)
;;!!   "Kill the rectangle between point and the mouse cursor."
;;!!   (interactive "@e")
;;!!   (let ((point-save (point)))
;;!!     (save-excursion
;;!!       (mouse-set-point event)
;;!!       (push-mark nil t)
;;!!       (if (> point-save (point))
;;!!      (open-rectangle (point) point-save)
;;!!    (open-rectangle point-save (point))))))
;;!!
;;!! ;; Must be a better way to do this.
;;!!
;;!! (defun mouse-multiple-insert (n char)
;;!!   (while (> n 0)
;;!!     (insert char)
;;!!     (setq n (1- n))))
;;!!
;;!! ;; What this could do is not finalize until button was released.
;;!!
;;!! (defun mouse-move-text (event)
;;!!   "Move text from point to cursor position, inserting spaces."
;;!!   (interactive "@e")
;;!!   (let* ((relative-coordinate
;;!!      (coordinates-in-window-p (car event) (selected-window))))
;;!!     (if (consp relative-coordinate)
;;!!    (cond ((> (current-column) (car relative-coordinate))
;;!!           (delete-char
;;!!            (- (car relative-coordinate) (current-column))))
;;!!          ((< (current-column) (car relative-coordinate))
;;!!           (mouse-multiple-insert
;;!!            (- (car relative-coordinate) (current-column)) " "))
;;!!          ((= (current-column) (car relative-coordinate)) (ding))))))
\f
;; Choose a completion with the mouse.

(defun mouse-choose-completion (event)
  "Click on an alternative in the `*Completions*' buffer to choose it."
  (interactive "e")
  ;; Give temporary modes such as isearch a chance to turn off.
  (run-hooks 'mouse-leave-buffer-hook)
  (let ((buffer (window-buffer))
        choice
        base-size)
    (save-excursion
      (set-buffer (window-buffer (posn-window (event-start event))))
      (if completion-reference-buffer
          (setq buffer completion-reference-buffer))
      (setq base-size completion-base-size)
      (save-excursion
        (goto-char (posn-point (event-start event)))
        (let (beg end)
          (if (and (not (eobp)) (get-text-property (point) 'mouse-face))
              (setq end (point) beg (1+ (point))))
          (if (null beg)
              (error "No completion here"))
          (setq beg (previous-single-property-change beg 'mouse-face))
          (setq end (or (next-single-property-change end 'mouse-face)
                        (point-max)))
          (setq choice (buffer-substring-no-properties beg end)))))
    (let ((owindow (selected-window)))
      (select-window (posn-window (event-start event)))
      (if (and (one-window-p t 'selected-frame)
               (window-dedicated-p (selected-window)))
          ;; This is a special buffer's frame
          (iconify-frame (selected-frame))
        (or (window-dedicated-p (selected-window))
            (bury-buffer)))
      (select-window owindow))
    (choose-completion-string choice buffer base-size)))
\f
;; Font selection.

(defun font-menu-add-default ()
  (let* ((default (cdr (assq 'font (frame-parameters (selected-frame)))))
         (font-alist x-fixed-font-alist)
         (elt (or (assoc "Misc" font-alist) (nth 1 font-alist))))
    (if (assoc "Default" elt)
        (delete (assoc "Default" elt) elt))
    (setcdr elt
            (cons (list "Default" default)
                  (cdr elt)))))

(defvar x-fixed-font-alist
  '("Font Menu"
    ("Misc"
     ;; For these, we specify the pixel height and width.
     ("fixed" "fixed")
     ("6x10" "-misc-fixed-medium-r-normal--10-*-*-*-c-60-iso8859-1" "6x10")
     ("6x12"
      "-misc-fixed-medium-r-semicondensed--12-*-*-*-c-60-iso8859-1" "6x12")
     ("6x13"
      "-misc-fixed-medium-r-semicondensed--13-*-*-*-c-60-iso8859-1" "6x13")
     ("7x13" "-misc-fixed-medium-r-normal--13-*-*-*-c-70-iso8859-1" "7x13")
     ("7x14" "-misc-fixed-medium-r-normal--14-*-*-*-c-70-iso8859-1" "7x14")
     ("8x13" "-misc-fixed-medium-r-normal--13-*-*-*-c-80-iso8859-1" "8x13")
     ("9x15" "-misc-fixed-medium-r-normal--15-*-*-*-c-90-iso8859-1" "9x15")
     ("10x20" "-misc-fixed-medium-r-normal--20-*-*-*-c-100-iso8859-1" "10x20")
     ("11x18" "-misc-fixed-medium-r-normal--18-*-*-*-c-110-iso8859-1" "11x18")
     ("12x24" "-misc-fixed-medium-r-normal--24-*-*-*-c-120-iso8859-1" "12x24")
     ("")
     ("clean 5x8"
      "-schumacher-clean-medium-r-normal--8-*-*-*-c-50-iso8859-1")
     ("clean 6x8"
      "-schumacher-clean-medium-r-normal--8-*-*-*-c-60-iso8859-1")
     ("clean 8x8"
      "-schumacher-clean-medium-r-normal--8-*-*-*-c-80-iso8859-1")
     ("clean 8x10"
      "-schumacher-clean-medium-r-normal--10-*-*-*-c-80-iso8859-1")
     ("clean 8x14"
      "-schumacher-clean-medium-r-normal--14-*-*-*-c-80-iso8859-1")
     ("clean 8x16"
      "-schumacher-clean-medium-r-normal--16-*-*-*-c-80-iso8859-1")
     ("")
     ("sony 8x16" "-sony-fixed-medium-r-normal--16-*-*-*-c-80-iso8859-1")
     ;; We don't seem to have these; who knows what they are.
     ;; ("fg-18" "fg-18")
     ;; ("fg-25" "fg-25")
     ("lucidasanstypewriter-12" "-b&h-lucidatypewriter-medium-r-normal-sans-*-120-*-*-*-*-iso8859-1")
     ("lucidasanstypewriter-bold-14" "-b&h-lucidatypewriter-bold-r-normal-sans-*-140-*-*-*-*-iso8859-1")
     ("lucidasanstypewriter-bold-24"
      "-b&h-lucidatypewriter-bold-r-normal-sans-*-240-*-*-*-*-iso8859-1")
     ;; ("lucidatypewriter-bold-r-24" "-b&h-lucidatypewriter-bold-r-normal-sans-24-240-75-75-m-140-iso8859-1")
     ;; ("fixed-medium-20" "-misc-fixed-medium-*-*-*-20-*-*-*-*-*-*-*")
     )
    ("Courier"
     ;; For these, we specify the point height.
     ("8" "-adobe-courier-medium-r-normal--*-80-*-*-m-*-iso8859-1")
     ("10" "-adobe-courier-medium-r-normal--*-100-*-*-m-*-iso8859-1")
     ("12" "-adobe-courier-medium-r-normal--*-120-*-*-m-*-iso8859-1")
     ("14" "-adobe-courier-medium-r-normal--*-140-*-*-m-*-iso8859-1")
     ("18" "-adobe-courier-medium-r-normal--*-180-*-*-m-*-iso8859-1")
     ("24" "-adobe-courier-medium-r-normal--*-240-*-*-m-*-iso8859-1")
     ("8 bold" "-adobe-courier-bold-r-normal--*-80-*-*-m-*-iso8859-1")
     ("10 bold" "-adobe-courier-bold-r-normal--*-100-*-*-m-*-iso8859-1")
     ("12 bold" "-adobe-courier-bold-r-normal--*-120-*-*-m-*-iso8859-1")
     ("14 bold" "-adobe-courier-bold-r-normal--*-140-*-*-m-*-iso8859-1")
     ("18 bold" "-adobe-courier-bold-r-normal--*-180-*-*-m-*-iso8859-1")
     ("24 bold" "-adobe-courier-bold-r-normal--*-240-*-*-m-*-iso8859-1")
     ("8 slant" "-adobe-courier-medium-o-normal--*-80-*-*-m-*-iso8859-1")
     ("10 slant" "-adobe-courier-medium-o-normal--*-100-*-*-m-*-iso8859-1")
     ("12 slant" "-adobe-courier-medium-o-normal--*-120-*-*-m-*-iso8859-1")
     ("14 slant" "-adobe-courier-medium-o-normal--*-140-*-*-m-*-iso8859-1")
     ("18 slant" "-adobe-courier-medium-o-normal--*-180-*-*-m-*-iso8859-1")
     ("24 slant" "-adobe-courier-medium-o-normal--*-240-*-*-m-*-iso8859-1")
     ("8 bold slant" "-adobe-courier-bold-o-normal--*-80-*-*-m-*-iso8859-1")
     ("10 bold slant" "-adobe-courier-bold-o-normal--*-100-*-*-m-*-iso8859-1")
     ("12 bold slant" "-adobe-courier-bold-o-normal--*-120-*-*-m-*-iso8859-1")
     ("14 bold slant" "-adobe-courier-bold-o-normal--*-140-*-*-m-*-iso8859-1")
     ("18 bold slant" "-adobe-courier-bold-o-normal--*-180-*-*-m-*-iso8859-1")
     ("24 bold slant" "-adobe-courier-bold-o-normal--*-240-*-*-m-*-iso8859-1"))
    )
  "X fonts suitable for use in Emacs.")

(declare-function generate-fontset-menu "fontset" ())

(defun mouse-select-font ()
  "Prompt for a font name, using `x-popup-menu', and return it."
  (interactive)
  (unless (display-multi-font-p)
    (error "Cannot change fonts on this display"))
  (car
   (x-popup-menu
    (if (listp last-nonmenu-event)
        last-nonmenu-event
      (list '(0 0) (selected-window)))
    (append x-fixed-font-alist
            (list (generate-fontset-menu))))))

(declare-function text-scale-mode "face-remap")

(defun mouse-set-font (&rest fonts)
  "Set the default font for the selected frame.
The argument FONTS is a list of font names; the first valid font
in this list is used.

When called interactively, pop up a menu and allow the user to
choose a font."
  (interactive
   (progn (unless (display-multi-font-p)
            (error "Cannot change fonts on this display"))
          (x-popup-menu
           (if (listp last-nonmenu-event)
               last-nonmenu-event
             (list '(0 0) (selected-window)))
           ;; Append list of fontsets currently defined.
           (append x-fixed-font-alist (list (generate-fontset-menu))))))
  (if fonts
      (let (font)
        (while fonts
          (condition-case nil
              (progn
                (set-frame-font (car fonts))
                (setq font (car fonts))
                (setq fonts nil))
            (error
             (setq fonts (cdr fonts)))))
        (if (null font)
            (error "Font not found")))))

(defvar mouse-appearance-menu-map nil)
(declare-function x-select-font "xfns.c" (&optional frame ignored)) ; USE_GTK
(declare-function buffer-face-mode-invoke "face-remap"
                  (face arg &optional interactive))
(declare-function font-face-attributes "font.c" (font &optional frame))

(defun mouse-appearance-menu (event)
  (interactive "@e")
  (require 'face-remap)
  (when (display-multi-font-p)
    (with-selected-window (car (event-start event))
      (if mouse-appearance-menu-map
          nil ; regenerate new fonts
        ;; Initialize mouse-appearance-menu-map
        (setq mouse-appearance-menu-map
              (make-sparse-keymap "Change Default Buffer Face"))
        (define-key mouse-appearance-menu-map [face-remap-reset-base]
          '(menu-item "Reset to Default" face-remap-reset-base))
        (define-key mouse-appearance-menu-map [text-scale-decrease]
          '(menu-item "Decrease Buffer Text Size" text-scale-decrease))
        (define-key mouse-appearance-menu-map [text-scale-increase]
          '(menu-item "Increase Buffer Text Size" text-scale-increase))
        ;; Font selector
        (if (functionp 'x-select-font)
            (define-key mouse-appearance-menu-map [x-select-font]
              '(menu-item "Change Buffer Font..." x-select-font))
          ;; If the select-font is unavailable, construct a menu.
          (let ((font-submenu (make-sparse-keymap "Change Text Font"))
                (font-alist (cdr (append x-fixed-font-alist
                                         (list (generate-fontset-menu))))))
            (dolist (family font-alist)
              (let* ((submenu-name (car family))
                     (submenu-map (make-sparse-keymap submenu-name)))
                (dolist (font (cdr family))
                  (let ((font-name (car font))
                        font-symbol)
                    (if (string= font-name "")
                        (define-key submenu-map [space]
                          '("--"))
                      (setq font-symbol (intern (cadr font)))
                      (define-key submenu-map (vector font-symbol)
                        (list 'menu-item (car font) font-symbol)))))
                (define-key font-submenu (vector (intern submenu-name))
                  (list 'menu-item submenu-name submenu-map))))
            (define-key mouse-appearance-menu-map [font-submenu]
              (list 'menu-item "Change Text Font" font-submenu)))))
      (let ((choice (x-popup-menu event mouse-appearance-menu-map)))
        (setq choice (nth (1- (length choice)) choice))
        (cond ((eq choice 'text-scale-increase)
               (text-scale-increase 1))
              ((eq choice 'text-scale-decrease)
               (text-scale-increase -1))
              ((eq choice 'face-remap-reset-base)
               (text-scale-mode 0)
               (buffer-face-mode 0))
              (choice
               ;; Either choice == 'x-select-font, or choice is a
               ;; symbol whose name is a font.
               (buffer-face-mode-invoke (font-face-attributes
                                         (if (eq choice 'x-select-font)
                                             (x-select-font)
                                           (symbol-name choice)))
                                        t (interactive-p))))))))

\f
;;; Bindings for mouse commands.

(define-key global-map [down-mouse-1] 'mouse-drag-region)
(global-set-key [mouse-1]       'mouse-set-point)
(global-set-key [drag-mouse-1]  'mouse-set-region)

;; These are tested for in mouse-drag-region.
(global-set-key [double-mouse-1] 'mouse-set-point)
(global-set-key [triple-mouse-1] 'mouse-set-point)

;; Clicking on the fringes causes hscrolling:
(global-set-key [left-fringe mouse-1]   'mouse-set-point)
(global-set-key [right-fringe mouse-1]  'mouse-set-point)

(global-set-key [mouse-2]       'mouse-yank-at-click)
;; Allow yanking also when the corresponding cursor is "in the fringe".
(global-set-key [right-fringe mouse-2] 'mouse-yank-at-click)
(global-set-key [left-fringe mouse-2] 'mouse-yank-at-click)
(global-set-key [mouse-3]       'mouse-save-then-kill)
(global-set-key [right-fringe mouse-3]  'mouse-save-then-kill)
(global-set-key [left-fringe mouse-3]   'mouse-save-then-kill)

;; By binding these to down-going events, we let the user use the up-going
;; event to make the selection, saving a click.
(global-set-key [C-down-mouse-1] 'mouse-buffer-menu)
(if (not (eq system-type 'ms-dos))
    (global-set-key [S-down-mouse-1] 'mouse-appearance-menu))
;; C-down-mouse-2 is bound in facemenu.el.
(global-set-key [C-down-mouse-3]
  '(menu-item "Menu Bar" ignore
    :filter (lambda (_)
              (if (zerop (or (frame-parameter nil 'menu-bar-lines) 0))
                  (mouse-menu-bar-map)
                (mouse-menu-major-mode-map)))))


;; Replaced with dragging mouse-1
;; (global-set-key [S-mouse-1]  'mouse-set-mark)

;; Binding mouse-1 to mouse-select-window when on mode-, header-, or
;; vertical-line prevents Emacs from signaling an error when the mouse
;; button is released after dragging these lines, on non-toolkit
;; versions.
(global-set-key [mode-line mouse-1] 'mouse-select-window)
(global-set-key [mode-line drag-mouse-1] 'mouse-select-window)
(global-set-key [mode-line down-mouse-1] 'mouse-drag-mode-line)
(global-set-key [header-line down-mouse-1] 'mouse-drag-header-line)
(global-set-key [header-line mouse-1] 'mouse-select-window)
(global-set-key [mode-line mouse-2] 'mouse-delete-other-windows)
(global-set-key [mode-line mouse-3] 'mouse-delete-window)
(global-set-key [mode-line C-mouse-2] 'mouse-split-window-horizontally)
(global-set-key [vertical-scroll-bar C-mouse-2] 'mouse-split-window-vertically)
(global-set-key [vertical-line C-mouse-2] 'mouse-split-window-vertically)
(global-set-key [vertical-line down-mouse-1] 'mouse-drag-vertical-line)
(global-set-key [vertical-line mouse-1] 'mouse-select-window)

(provide 'mouse)

;; This file contains the functionality of the old mldrag.el.
(defalias 'mldrag-drag-mode-line 'mouse-drag-mode-line)
(defalias 'mldrag-drag-vertical-line 'mouse-drag-vertical-line)
(make-obsolete 'mldrag-drag-mode-line 'mouse-drag-mode-line "21.1")
(make-obsolete 'mldrag-drag-vertical-line 'mouse-drag-vertical-line "21.1")
(provide 'mldrag)

;; arch-tag: 9a710ce1-914a-4923-9b81-697f7bf82ab3
;;; mouse.el ends here