code.delx.au - gnu-emacs/blob - lisp/menu-bar.el

   1 ;;; menu-bar.el --- define a default menu bar.
   2
   3 ;; Author: RMS
   4 ;; Keywords: internal
   5
   6 ;; Copyright (C) 1993 Free Software Foundation, Inc.
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Code:
  25
  26 ;; Don't clobber an existing menu-bar keymap, to preserve any menu-bar key
  27 ;; definitions made in loaddefs.el.
  28 (or (lookup-key global-map [menu-bar])
  29     (define-key global-map [menu-bar] (make-sparse-keymap "menu-bar")))
  30 (defvar menu-bar-help-menu (make-sparse-keymap "Help"))
  31 ;; Put Help item last.
  32 (setq menu-bar-final-items '(help))
  33 (define-key global-map [menu-bar help] (cons "Help" menu-bar-help-menu))
  34 (defvar menu-bar-edit-menu (make-sparse-keymap "Edit"))
  35 (define-key global-map [menu-bar edit] (cons "Edit" menu-bar-edit-menu))
  36 (defvar menu-bar-file-menu (make-sparse-keymap "File"))
  37 (define-key global-map [menu-bar file] (cons "File" menu-bar-file-menu))
  38
  39 (define-key menu-bar-file-menu [exit-emacs]
  40   '("Exit Emacs" . save-buffers-kill-emacs))
  41 (define-key menu-bar-file-menu [kill-buffer]
  42   '("Kill Buffer" . kill-this-buffer))
  43 (define-key menu-bar-file-menu [delete-frame] '("Delete Frame" . delete-frame))
  44 (define-key menu-bar-file-menu [bookmark]
  45   '("Bookmarks..." . menu-bar-bookmark-map))
  46 (define-key menu-bar-file-menu [print-buffer] '("Print Buffer" . print-buffer))
  47 (define-key menu-bar-file-menu [revert-buffer]
  48   '("Revert Buffer" . revert-buffer))
  49 (define-key menu-bar-file-menu [write-file]
  50   '("Save Buffer As..." . write-file))
  51 (define-key menu-bar-file-menu [save-buffer] '("Save Buffer" . save-buffer))
  52 (define-key menu-bar-file-menu [dired] '("Open Directory..." . dired))
  53 (define-key menu-bar-file-menu [open-file] '("Open File..." . find-file))
  54 (define-key menu-bar-file-menu [new-frame] '("New Frame" . new-frame))
  55
  56 (define-key menu-bar-edit-menu [spell] '("Spell..." . ispell-menu-map))
  57 (define-key menu-bar-edit-menu [fill] '("Fill" . fill-region))
  58 (define-key menu-bar-edit-menu [clear] '("Clear" . delete-region))
  59 (define-key menu-bar-edit-menu [re-search-back]
  60   '("Regexp Search Backwards" . re-search-backward))
  61 (define-key menu-bar-edit-menu [search-back]
  62   '("Search Backwards" . search-backward))
  63 (define-key menu-bar-edit-menu [re-search-fwd]
  64   '("Regexp Search" . re-search-forward))
  65 (define-key menu-bar-edit-menu [search-fwd]
  66   '("Search" . search-forward))
  67 (define-key menu-bar-edit-menu [choose-next-paste]
  68   '("Choose Next Paste" . mouse-menu-choose-yank))
  69 (define-key menu-bar-edit-menu [paste] '("Paste" . yank))
  70 (define-key menu-bar-edit-menu [copy] '("Copy" . kill-ring-save))
  71 (define-key menu-bar-edit-menu [cut] '("Cut" . kill-region))
  72 (define-key menu-bar-edit-menu [undo] '("Undo" . undo))
  73
  74 (put 'fill-region 'menu-enable 'mark-active)
  75 (put 'kill-region 'menu-enable 'mark-active)
  76 (put 'kill-ring-save 'menu-enable 'mark-active)
  77 (put 'yank 'menu-enable '(x-selection-exists-p))
  78 (put 'delete-region 'menu-enable 'mark-active)
  79 (put 'undo 'menu-enable '(if (eq last-command 'undo)
  80                              pending-undo-list
  81                            (consp buffer-undo-list)))
  82
  83 (autoload 'ispell-menu-map "ispell" nil t 'keymap)
  84
  85 (define-key menu-bar-help-menu [emacs-tutorial]
  86   '("Emacs Tutorial" . help-with-tutorial))
  87 (define-key menu-bar-help-menu [man] '("Man..." . manual-entry))
  88 (define-key menu-bar-help-menu [describe-variable]
  89   '("Describe Variable..." . describe-variable))
  90 (define-key menu-bar-help-menu [describe-function]
  91   '("Describe Function..." . describe-function))
  92 (define-key menu-bar-help-menu [describe-key]
  93   '("Describe Key..." . describe-key))
  94 (define-key menu-bar-help-menu [list-keybindings]
  95   '("List Keybindings" . describe-bindings))
  96 (define-key menu-bar-help-menu [command-apropos]
  97   '("Command Apropos..." . command-apropos))
  98 (define-key menu-bar-help-menu [describe-mode]
  99   '("Describe Mode" . describe-mode))
 100 (define-key menu-bar-help-menu [info] '("Info" . info))
 101
 102 (define-key menu-bar-help-menu [emacs-news] '("Emacs News" . view-emacs-news))
 103 (defun kill-this-buffer ()      ; for the menubar
 104   "Kills the current buffer."
 105   (interactive)
 106   (kill-buffer (current-buffer)))
 107
 108 (defun kill-this-buffer-enabled-p ()
 109   (let ((count 0)
 110         (buffers (buffer-list)))
 111     (while buffers
 112       (or (string-match "^ " (buffer-name (car buffers)))
 113           (setq count (1+ count)))
 114       (setq buffers (cdr buffers)))
 115     (> count 1)))
 116
 117 (put 'save-buffer 'menu-enable '(buffer-modified-p))
 118 (put 'revert-buffer 'menu-enable
 119      '(or revert-buffer-function revert-buffer-insert-file-contents-function
 120           (and (buffer-file-name)
 121                (or (buffer-modified-p)
 122                    (not (verify-visited-file-modtime (current-buffer)))))))
 123 ;; Permit deleting frame if it would leave a visible or iconified frame.
 124 (put 'delete-frame 'menu-enable
 125      '(let ((frames (frame-list))
 126             (count 0))
 127         (while frames
 128           (if (cdr (assq 'visibility (frame-parameters (car frames))))
 129               (setq count (1+ count)))
 130           (setq frames (cdr frames)))
 131         (> count 1)))
 132 (put 'kill-this-buffer 'menu-enable '(kill-this-buffer-enabled-p))
 133
 134 (put 'advertised-undo 'menu-enable
 135      '(and (not (eq t buffer-undo-list))
 136            (if (eq last-command 'undo)
 137                (and (boundp 'pending-undo-list)
 138                     pending-undo-list)
 139              buffer-undo-list)))
 140
 141 (defvar yank-menu-length 100
 142   "*Maximum length of an item in the menu for \
 143 \\[mouse-menu-choose-yank].")
 144
 145 (defun mouse-menu-choose-yank (event)
 146   "Pop up a menu of the kill-ring for selection with the mouse.
 147 The kill-ring-yank-pointer is moved to the selected element.
 148 A subsequent \\[yank] yanks the choice just selected."
 149   (interactive "e")
 150   (let* ((count 0)
 151          (menu (mapcar (lambda (string)
 152                          (if (> (length string) yank-menu-length)
 153                              (setq string (substring string
 154                                                      0 yank-menu-length)))
 155                          (prog1 (cons string count)
 156                            (setq count (1+ count))))
 157                        kill-ring))
 158          (arg (x-popup-menu event
 159                             (list "Yank Menu"
 160                                   (cons "Choose Next Yank" menu)))))
 161     ;; A mouse click outside the menu returns nil.
 162     ;; Avoid a confusing error from passing nil to rotate-yank-pointer.
 163     ;; XXX should this perhaps do something other than simply return? -rm
 164     (if arg
 165         (progn
 166           (rotate-yank-pointer arg)
 167           (if (interactive-p)
 168               (message "The next yank will insert the selected text.")
 169             (current-kill 0))))))
 170 (put 'mouse-menu-choose-yank 'menu-enable 'kill-ring)
 171 \f
 172 (define-key global-map [menu-bar buffer] '("Buffers" . mouse-menu-bar-buffers))
 173
 174 (defvar complex-buffers-menu-p nil
 175   "*Non-nil says, offer a choice of actions after you pick a buffer.
 176 This applies to the Buffers menu from the menu bar.")
 177
 178 (defvar buffers-menu-max-size 10
 179   "*Maximum number of entries which may appear on the Buffers menu.
 180 If this is 10, then only the ten most-recently-selected buffers are shown.
 181 If this is nil, then all buffers are shown.
 182 A large number or nil slows down menu responsiveness.")
 183
 184 (defvar list-buffers-directory nil)
 185
 186 (defun mouse-menu-bar-buffers (event)
 187   "Pop up a menu of buffers for selection with the mouse.
 188 This switches buffers in the window that you clicked on,
 189 and selects that window."
 190   (interactive "e")
 191   (let ((buffers (buffer-list))
 192         menu)
 193     ;; If requested, list only the N most recently selected buffers.
 194     (if (and (integerp buffers-menu-max-size)
 195              (> buffers-menu-max-size 1))
 196         (if (> (length buffers) buffers-menu-max-size)
 197             (setcdr (nthcdr buffers-menu-max-size buffers) nil)))
 198     (setq menu
 199           (cons "Select Buffer"
 200                 (let ((tail buffers)
 201                       (maxbuf 0)
 202                       (maxlen 0)
 203                       head)
 204                   (while tail
 205                     (or (eq ?\ (aref (buffer-name (car tail)) 0))
 206                         (setq maxbuf
 207                               (max maxbuf
 208                                    (length (buffer-name (car tail))))))
 209                     (setq tail (cdr tail)))
 210                   (setq tail buffers)
 211                   (while tail
 212                     (let ((elt (car tail)))
 213                       (if (not (string-match "^ "
 214                                              (buffer-name elt)))
 215                           (setq head (cons
 216                                       (cons
 217                                        (format
 218                                         (format "%%%ds  %%s%%s  %%s"
 219                                                 maxbuf)
 220                                         (buffer-name elt)
 221                                         (if (buffer-modified-p elt)
 222                                             "*" " ")
 223                                         (save-excursion
 224                                           (set-buffer elt)
 225                                           (if buffer-read-only "%" " "))
 226                                         (or (buffer-file-name elt)
 227                                             (save-excursion
 228                                               (set-buffer elt)
 229                                               list-buffers-directory)
 230                                             ""))
 231                                        elt)
 232                                       head)))
 233                       (and head (> (length (car (car head))) maxlen)
 234                            (setq maxlen (length (car (car head))))))
 235                     (setq tail (cdr tail)))
 236                   (nconc (nreverse head)
 237                          (list (cons
 238                                 (concat (make-string (max (- (/ maxlen
 239                                                                 2)
 240                                                              8)
 241                                                           0) ?\ )
 242                                         "List All Buffers")
 243                                 'list-buffers))))))
 244     (setq menu (list menu))
 245
 246     (if (cdr (frame-list))
 247         (setq menu
 248               (cons (cons "Select Frame"
 249                           (mapcar (lambda (frame)
 250                                     (cons (cdr (assq 'name
 251                                                      (frame-parameters frame)))
 252                                           frame))
 253                                   (frame-list)))
 254                     menu)))
 255     (setq menu (cons "Buffer and Frame Menu" menu))
 256
 257     (let ((buf (x-popup-menu (if (listp event) event
 258                                (cons '(0 0) (selected-frame)))
 259                              menu))
 260           (window (and (listp event) (posn-window (event-start event)))))
 261       (cond ((framep buf)
 262              (make-frame-visible buf)
 263              (raise-frame buf)
 264              (select-frame buf))
 265             ((eq buf 'list-buffers)
 266              (list-buffers))
 267             (buf
 268              (if complex-buffers-menu-p
 269                  (let ((action (x-popup-menu
 270                                 (if (listp event) event
 271                                   (cons '(0 0) (selected-frame)))
 272                                 '("Buffer Action"
 273                                   (""
 274                                    ("Save Buffer" . save-buffer)
 275                                    ("Kill Buffer" . kill-buffer)
 276                                    ("Select Buffer" . switch-to-buffer))))))
 277                    (if (eq action 'save-buffer)
 278                        (save-excursion
 279                          (set-buffer buf)
 280                          (save-buffer))
 281                      (funcall action buf)))
 282                (and (windowp window)
 283                     (select-window window))
 284                (switch-to-buffer buf)))))))
 285
 286 ;; this version is too slow
 287 ;;;(defun format-buffers-menu-line (buffer)
 288 ;;;  "Returns a string to represent the given buffer in the Buffer menu.
 289 ;;;nil means the buffer shouldn't be listed.  You can redefine this."
 290 ;;;  (if (string-match "\\` " (buffer-name buffer))
 291 ;;;      nil
 292 ;;;    (save-excursion
 293 ;;;     (set-buffer buffer)
 294 ;;;     (let ((size (buffer-size)))
 295 ;;;       (format "%s%s %-19s %6s %-15s %s"
 296 ;;;            (if (buffer-modified-p) "*" " ")
 297 ;;;            (if buffer-read-only "%" " ")
 298 ;;;            (buffer-name)
 299 ;;;            size
 300 ;;;            mode-name
 301 ;;;            (or (buffer-file-name) ""))))))
 302 \f
 303 (defun menu-bar-mode (flag)
 304   "Toggle display of a menu bar on each frame.
 305 This command applies to all frames that exist and frames to be
 306 created in the future.
 307 With a numeric argument, if the argument is negative,
 308 turn off menu bars; otherwise, turn on menu bars."
 309  (interactive "P")
 310  (if flag (setq flag (prefix-numeric-value flag)))
 311
 312  ;; Obtain the current setting by looking at default-frame-alist.
 313  (let ((menu-bar-mode
 314         (not (zerop (let ((assq (assq 'menu-bar-lines default-frame-alist)))
 315                       (if assq (cdr assq) 0))))))
 316
 317    ;; Tweedle it according to the argument.
 318    (setq menu-bar-mode (if (null flag) (not menu-bar-mode)
 319                          (or (not (numberp flag)) (>= flag 0))))
 320
 321    ;; Apply it to default-frame-alist.
 322    (let ((parameter (assq 'menu-bar-lines default-frame-alist)))
 323      (if (consp parameter)
 324          (setcdr parameter (if menu-bar-mode 1 0))
 325        (setq default-frame-alist
 326              (cons (cons 'menu-bar-lines (if menu-bar-mode 1 0))
 327                    default-frame-alist))))
 328
 329    ;; Apply it to existing frames.
 330    (let ((frames (frame-list)))
 331      (while frames
 332        (modify-frame-parameters (car frames)
 333                                 (list (cons 'menu-bar-lines
 334                                             (if menu-bar-mode 1 0))))
 335        (setq frames (cdr frames))))))
 336
 337 ;; Make frames created from now on have a menu bar.
 338 (if window-system
 339     (menu-bar-mode t))
 340
 341 (provide 'menu-bar)
 342
 343 ;;; menu-bar.el ends here