lisp/tool-bar.el

   1 ;;; tool-bar.el --- setting up the tool bar
   2
   3 ;; Copyright (C) 2000-2016 Free Software Foundation, Inc.
   4
   5 ;; Author: Dave Love <fx@gnu.org>
   6 ;; Keywords: mouse frames
   7 ;; Package: emacs
   8
   9 ;; This file is part of GNU Emacs.
  10
  11 ;; GNU Emacs is free software: you can redistribute it and/or modify
  12 ;; it under the terms of the GNU General Public License as published by
  13 ;; the Free Software Foundation, either version 3 of the License, or
  14 ;; (at your option) any later version.
  15
  16 ;; GNU Emacs is distributed in the hope that it will be useful,
  17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19 ;; GNU General Public License for more details.
  20
  21 ;; You should have received a copy of the GNU General Public License
  22 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  23
  24 ;;; Commentary:
  25
  26 ;; Provides `tool-bar-mode' to control display of the tool-bar and
  27 ;; bindings for the global tool bar with convenience functions
  28 ;; `tool-bar-add-item' and `tool-bar-add-item-from-menu'.
  29
  30 ;; The normal global binding for [tool-bar] (below) uses the value of
  31 ;; `tool-bar-map' as the actual keymap to define the tool bar.  Modes
  32 ;; may either bind items under the [tool-bar] prefix key of the local
  33 ;; map to add to the global bar or may set `tool-bar-map'
  34 ;; buffer-locally to override it.  (Some items are removed from the
  35 ;; global bar in modes which have `special' as their `mode-class'
  36 ;; property.)
  37
  38 ;; Todo: Somehow make tool bars easily customizable by the naive?
  39
  40 ;;; Code:
  41
  42 ;; The autoload cookie doesn't work when preloading.
  43 ;; Deleting it means invoking this command won't work
  44 ;; when you are on a tty.  I hope that won't cause too much trouble -- rms.
  45 (define-minor-mode tool-bar-mode
  46   "Toggle the tool bar in all graphical frames (Tool Bar mode).
  47 With a prefix argument ARG, enable Tool Bar mode if ARG is
  48 positive, and disable it otherwise.  If called from Lisp, enable
  49 Tool Bar mode if ARG is omitted or nil.
  50
  51 See `tool-bar-add-item' and `tool-bar-add-item-from-menu' for
  52 conveniently adding tool bar items."
  53   :init-value t
  54   :global t
  55   ;; It's defined in C/cus-start, this stops the d-m-m macro defining it again.
  56   :variable tool-bar-mode
  57   (let ((val (if tool-bar-mode 1 0)))
  58     (dolist (frame (frame-list))
  59       (set-frame-parameter frame 'tool-bar-lines val))
  60     ;; If the user has given `default-frame-alist' a `tool-bar-lines'
  61     ;; parameter, replace it.
  62     (if (assq 'tool-bar-lines default-frame-alist)
  63         (setq default-frame-alist
  64               (cons (cons 'tool-bar-lines val)
  65                     (assq-delete-all 'tool-bar-lines
  66                                      default-frame-alist)))))
  67   (and tool-bar-mode
  68        (= 1 (length (default-value 'tool-bar-map))) ; not yet setup
  69        (tool-bar-setup)))
  70
  71 ;;;###autoload
  72 ;; Used in the Show/Hide menu, to have the toggle reflect the current frame.
  73 (defun toggle-tool-bar-mode-from-frame (&optional arg)
  74   "Toggle tool bar on or off, based on the status of the current frame.
  75 See `tool-bar-mode' for more information."
  76   (interactive (list (or current-prefix-arg 'toggle)))
  77   (if (eq arg 'toggle)
  78       (tool-bar-mode (if (> (frame-parameter nil 'tool-bar-lines) 0) 0 1))
  79     (tool-bar-mode arg)))
  80
  81 (defvar tool-bar-map (make-sparse-keymap)
  82   "Keymap for the tool bar.
  83 Define this locally to override the global tool bar.")
  84
  85 (global-set-key [tool-bar]
  86                 `(menu-item ,(purecopy "tool bar") ignore
  87                             :filter tool-bar-make-keymap))
  88
  89 (declare-function image-mask-p "image.c" (spec &optional frame))
  90
  91 (defconst tool-bar-keymap-cache (make-hash-table :weakness t :test 'equal))
  92
  93 (defun tool-bar-make-keymap (&optional _ignore)
  94   "Generate an actual keymap from `tool-bar-map'.
  95 Its main job is to figure out which images to use based on the display's
  96 color capability and based on the available image libraries."
  97   (let ((key (cons (frame-terminal) tool-bar-map)))
  98     (or (gethash key tool-bar-keymap-cache)
  99         (puthash key (tool-bar-make-keymap-1) tool-bar-keymap-cache))))
 100
 101 (defun tool-bar-make-keymap-1 ()
 102   "Generate an actual keymap from `tool-bar-map', without caching."
 103   (mapcar (lambda (bind)
 104             (let (image-exp plist)
 105               (when (and (eq (car-safe (cdr-safe bind)) 'menu-item)
 106                          ;; For the format of menu-items, see node
 107                          ;; `Extended Menu Items' in the Elisp manual.
 108                          (setq plist (nthcdr (if (consp (nth 4 bind)) 5 4)
 109                                              bind))
 110                          (setq image-exp (plist-get plist :image))
 111                          (consp image-exp)
 112                          (not (eq (car image-exp) 'image))
 113                          (fboundp (car image-exp)))
 114                 (if (not (display-images-p))
 115                     (setq bind nil)
 116                   (let ((image (eval image-exp)))
 117                     (unless (and image (image-mask-p image))
 118                       (setq image (append image '(:mask heuristic))))
 119                     (setq bind (copy-sequence bind)
 120                           plist (nthcdr (if (consp (nth 4 bind)) 5 4)
 121                                         bind))
 122                     (plist-put plist :image image))))
 123               bind))
 124           tool-bar-map))
 125
 126 ;;;###autoload
 127 (defun tool-bar-add-item (icon def key &rest props)
 128   "Add an item to the tool bar.
 129 ICON names the image, DEF is the key definition and KEY is a symbol
 130 for the fake function key in the menu keymap.  Remaining arguments
 131 PROPS are additional items to add to the menu item specification.  See
 132 Info node `(elisp)Tool Bar'.  Items are added from left to right.
 133
 134 ICON is the base name of a file containing the image to use.  The
 135 function will first try to use low-color/ICON.xpm if `display-color-cells'
 136 is less or equal to 256, then ICON.xpm, then ICON.pbm, and finally
 137 ICON.xbm, using `find-image'.
 138
 139 Use this function only to make bindings in the global value of `tool-bar-map'.
 140 To define items in any other map, use `tool-bar-local-item'."
 141   (apply 'tool-bar-local-item icon def key tool-bar-map props))
 142
 143 (defun tool-bar--image-expression (icon)
 144   "Return an expression that evaluates to an image spec for ICON."
 145   (let* ((fg (face-attribute 'tool-bar :foreground))
 146          (bg (face-attribute 'tool-bar :background))
 147          (colors (nconc (if (eq fg 'unspecified) nil (list :foreground fg))
 148                         (if (eq bg 'unspecified) nil (list :background bg))))
 149          (xpm-spec (list :type 'xpm :file (concat icon ".xpm")))
 150          (xpm-lo-spec (list :type 'xpm :file
 151                             (concat "low-color/" icon ".xpm")))
 152          (pbm-spec (append (list :type 'pbm :file
 153                                  (concat icon ".pbm")) colors))
 154          (xbm-spec (append (list :type 'xbm :file
 155                                  (concat icon ".xbm")) colors)))
 156     `(find-image (cond ((not (display-color-p))
 157                         ',(list pbm-spec xbm-spec xpm-lo-spec xpm-spec))
 158                        ((< (display-color-cells) 256)
 159                         ',(list xpm-lo-spec xpm-spec pbm-spec xbm-spec))
 160                        (t
 161                         ',(list xpm-spec pbm-spec xbm-spec))))))
 162
 163 ;;;###autoload
 164 (defun tool-bar-local-item (icon def key map &rest props)
 165   "Add an item to the tool bar in map MAP.
 166 ICON names the image, DEF is the key definition and KEY is a symbol
 167 for the fake function key in the menu keymap.  Remaining arguments
 168 PROPS are additional items to add to the menu item specification.  See
 169 Info node `(elisp)Tool Bar'.  Items are added from left to right.
 170
 171 ICON is the base name of a file containing the image to use.  The
 172 function will first try to use low-color/ICON.xpm if `display-color-cells'
 173 is less or equal to 256, then ICON.xpm, then ICON.pbm, and finally
 174 ICON.xbm, using `find-image'."
 175   (let* ((image-exp (tool-bar--image-expression icon)))
 176     (define-key-after map (vector key)
 177       `(menu-item ,(symbol-name key) ,def :image ,image-exp ,@props))
 178     (force-mode-line-update)))
 179
 180 ;;;###autoload
 181 (defun tool-bar-add-item-from-menu (command icon &optional map &rest props)
 182   "Define tool bar binding for COMMAND in keymap MAP using the given ICON.
 183 This makes a binding for COMMAND in `tool-bar-map', copying its
 184 binding from the menu bar in MAP (which defaults to `global-map'), but
 185 modifies the binding by adding an image specification for ICON.  It
 186 finds ICON just like `tool-bar-add-item'.  PROPS are additional
 187 properties to add to the binding.
 188
 189 MAP must contain appropriate binding for `[menu-bar]' which holds a keymap.
 190
 191 Use this function only to make bindings in the global value of `tool-bar-map'.
 192 To define items in any other map, use `tool-bar-local-item-from-menu'."
 193   (apply 'tool-bar-local-item-from-menu command icon
 194          (default-value 'tool-bar-map) map props))
 195
 196 ;;;###autoload
 197 (defun tool-bar-local-item-from-menu (command icon in-map &optional from-map &rest props)
 198   "Define local tool bar binding for COMMAND using the given ICON.
 199 This makes a binding for COMMAND in IN-MAP, copying its binding from
 200 the menu bar in FROM-MAP (which defaults to `global-map'), but
 201 modifies the binding by adding an image specification for ICON.  It
 202 finds ICON just like `tool-bar-add-item'.  PROPS are additional
 203 properties to add to the binding.
 204
 205 FROM-MAP must contain appropriate binding for `[menu-bar]' which
 206 holds a keymap."
 207   (unless from-map
 208     (setq from-map global-map))
 209   (let* ((menu-bar-map (lookup-key from-map [menu-bar]))
 210          (keys (where-is-internal command menu-bar-map))
 211          (image-exp (tool-bar--image-expression icon))
 212          submap key)
 213     ;; We'll pick up the last valid entry in the list of keys if
 214     ;; there's more than one.
 215     ;; FIXME: Aren't they *all* "valid"??  --Stef
 216     (dolist (k keys)
 217       ;; We're looking for a binding of the command in a submap of
 218       ;; the menu bar map, so the key sequence must be two or more
 219       ;; long.
 220       (if (and (vectorp k)
 221                (> (length k) 1))
 222           (let ((m (lookup-key menu-bar-map (substring k 0 -1)))
 223                 ;; Last element in the bound key sequence:
 224                 (kk (aref k (1- (length k)))))
 225             (if (and (keymapp m)
 226                      (symbolp kk))
 227                 (setq submap m
 228                       key kk)))))
 229     (when (and (symbolp submap) (boundp submap))
 230       (setq submap (eval submap)))
 231     (let ((defn (assq key (cdr submap))))
 232       (if (eq (cadr defn) 'menu-item)
 233           (define-key-after in-map (vector key)
 234             (append (cdr defn) (list :image image-exp) props))
 235         (setq defn (cdr defn))
 236         (define-key-after in-map (vector key)
 237           (let ((rest (cdr defn)))
 238             ;; If the rest of the definition starts
 239             ;; with a list of menu cache info, get rid of that.
 240             (if (and (consp rest) (consp (car rest)))
 241                 (setq rest (cdr rest)))
 242             (append `(menu-item ,(car defn) ,rest)
 243                     (list :image image-exp) props))))
 244       (force-mode-line-update))))
 245
 246 ;;; Set up some global items.  Additions/deletions up for grabs.
 247
 248 (defun tool-bar-setup ()
 249   (setq tool-bar-separator-image-expression
 250         (tool-bar--image-expression "separator"))
 251   (tool-bar-add-item-from-menu 'find-file "new" nil :label "New File"
 252                                :vert-only t)
 253   (tool-bar-add-item-from-menu 'menu-find-file-existing "open" nil
 254                                :label "Open" :vert-only t)
 255   (tool-bar-add-item-from-menu 'dired "diropen" nil :vert-only t)
 256   (tool-bar-add-item-from-menu 'kill-this-buffer "close" nil :vert-only t)
 257   (tool-bar-add-item-from-menu 'save-buffer "save" nil
 258                                :label "Save")
 259   (define-key-after (default-value 'tool-bar-map) [separator-1] menu-bar-separator)
 260   (tool-bar-add-item-from-menu 'undo "undo" nil)
 261   (define-key-after (default-value 'tool-bar-map) [separator-2] menu-bar-separator)
 262   (tool-bar-add-item-from-menu (lookup-key menu-bar-edit-menu [cut])
 263                                "cut" nil :vert-only t)
 264   (tool-bar-add-item-from-menu (lookup-key menu-bar-edit-menu [copy])
 265                                "copy" nil :vert-only t)
 266   (tool-bar-add-item-from-menu (lookup-key menu-bar-edit-menu [paste])
 267                                "paste" nil :vert-only t)
 268   (define-key-after (default-value 'tool-bar-map) [separator-3] menu-bar-separator)
 269   (tool-bar-add-item-from-menu 'isearch-forward "search"
 270                                nil :label "Search" :vert-only t)
 271   ;;(tool-bar-add-item-from-menu 'ispell-buffer "spell")
 272
 273   ;; There's no icon appropriate for News and we need a command rather
 274   ;; than a lambda for Read Mail.
 275   ;;(tool-bar-add-item-from-menu 'compose-mail "mail/compose")
 276
 277   ;; Help button on a tool bar is rather non-standard...
 278   ;; (let ((tool-bar-map (default-value 'tool-bar-map)))
 279   ;;   (tool-bar-add-item "help" (lambda ()
 280   ;;                            (interactive)
 281   ;;                            (popup-menu menu-bar-help-menu))
 282   ;;                   'help
 283   ;;                   :help "Pop up the Help menu"))
 284 )
 285
 286 (if (featurep 'move-toolbar)
 287     (defcustom tool-bar-position 'top
 288       "Specify on which side the tool bar shall be.
 289 Possible values are `top' (tool bar on top), `bottom' (tool bar at bottom),
 290 `left' (tool bar on left) and `right' (tool bar on right).
 291 Customize `tool-bar-mode' if you want to show or hide the tool bar."
 292       :version "24.1"
 293       :type '(choice (const top)
 294                      (const bottom)
 295                      (const left)
 296                      (const right))
 297       :group 'frames
 298       :initialize 'custom-initialize-default
 299       :set (lambda (sym val)
 300              (set-default sym val)
 301              (modify-all-frames-parameters
 302               (list (cons 'tool-bar-position val))))))
 303
 304
 305 (provide 'tool-bar)
 306
 307 ;;; tool-bar.el ends here