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- ;;; easymenu.el --- support the easymenu interface for defining a menu.
-
- ;; Copyright (C) 1994 Free Software Foundation, Inc.
-
- ;; Keywords: emulations
- ;; Author: rms
-
- ;; This file is part of GNU Emacs.
-
- ;; GNU Emacs is free software; you can redistribute it and/or modify
- ;; it under the terms of the GNU General Public License as published by
- ;; the Free Software Foundation; either version 2, or (at your option)
- ;; any later version.
-
- ;; GNU Emacs is distributed in the hope that it will be useful,
- ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
- ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- ;; GNU General Public License for more details.
-
- ;; You should have received a copy of the GNU General Public License
- ;; along with GNU Emacs; see the file COPYING. If not, write to the
- ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- ;; Boston, MA 02111-1307, USA.
-
- ;;; Commentary:
-
- ;; This is compatible with easymenu.el by Per Abrahamsen
- ;; but it is much simpler as it doesn't try to support other Emacs versions.
- ;; The code was mostly derived from lmenu.el.
-
- ;;; Code:
-
- ;;;###autoload
- (defmacro easy-menu-define (symbol maps doc menu)
- "Define a menu bar submenu in maps MAPS, according to MENU.
- The menu keymap is stored in symbol SYMBOL, both as its value
- and as its function definition. DOC is used as the doc string for SYMBOL.
-
- The first element of MENU must be a string. It is the menu bar item name.
- The rest of the elements are menu items.
-
- A menu item is usually a vector of three elements: [NAME CALLBACK ENABLE]
-
- NAME is a string--the menu item name.
-
- CALLBACK is a command to run when the item is chosen,
- or a list to evaluate when the item is chosen.
-
- ENABLE is an expression; the item is enabled for selection
- whenever this expression's value is non-nil.
-
- Alternatively, a menu item may have the form:
-
- [ NAME CALLBACK [ KEYWORD ARG ] ... ]
-
- Where KEYWORD is one of the symbol defined below.
-
- :keys KEYS
-
- KEYS is a string; a complex keyboard equivalent to this menu item.
- This is normally not needed because keyboard equivalents are usually
- computed automatically.
-
- :active ENABLE
-
- ENABLE is an expression; the item is enabled for selection
- whenever this expression's value is non-nil.
-
- :suffix NAME
-
- NAME is a string; the name of an argument to CALLBACK.
-
- :style STYLE
-
- STYLE is a symbol describing the type of menu item. The following are
- defined:
-
- toggle: A checkbox.
- Currently just prepend the name with the string \"Toggle \".
- radio: A radio button.
- nil: An ordinary menu item.
-
- :selected SELECTED
-
- SELECTED is an expression; the checkbox or radio button is selected
- whenever this expression's value is non-nil.
- Currently just disable radio buttons, no effect on checkboxes.
-
- A menu item can be a string. Then that string appears in the menu as
- unselectable text. A string consisting solely of hyphens is displayed
- as a solid horizontal line.
-
- A menu item can be a list. It is treated as a submenu.
- The first element should be the submenu name. That's used as the
- menu item in the top-level menu. The cdr of the submenu list
- is a list of menu items, as above."
- (` (progn
- (defvar (, symbol) nil (, doc))
- (easy-menu-do-define (quote (, symbol)) (, maps) (, doc) (, menu)))))
-
- ;;;###autoload
- (defun easy-menu-do-define (symbol maps doc menu)
- ;; We can't do anything that might differ between Emacs dialects in
- ;; `easy-menu-define' in order to make byte compiled files
- ;; compatible. Therefore everything interesting is done in this
- ;; function.
- (set symbol (easy-menu-create-keymaps (car menu) (cdr menu)))
- (fset symbol (` (lambda (event) (, doc) (interactive "@e")
- (easy-popup-menu event (, symbol)))))
- (mapcar (function (lambda (map)
- (define-key map (vector 'menu-bar (intern (car menu)))
- (cons (car menu) (symbol-value symbol)))))
- (if (keymapp maps) (list maps) maps)))
-
- (defvar easy-menu-item-count 0)
-
- ;; Return a menu keymap corresponding to a Lucid-style menu list
- ;; MENU-ITEMS, and with name MENU-NAME.
- ;;;###autoload
- (defun easy-menu-create-keymaps (menu-name menu-items)
- (let ((menu (make-sparse-keymap menu-name)))
- ;; Process items in reverse order,
- ;; since the define-key loop reverses them again.
- (setq menu-items (reverse menu-items))
- (while menu-items
- (let* ((item (car menu-items))
- (callback (if (vectorp item) (aref item 1)))
- command enabler name)
- (cond ((stringp item)
- (setq command nil)
- (setq name (if (string-match "^-+$" item) "" item)))
- ((consp item)
- (setq command (easy-menu-create-keymaps (car item) (cdr item)))
- (setq name (car item)))
- ((vectorp item)
- (setq command (make-symbol (format "menu-function-%d"
- easy-menu-item-count)))
- (setq easy-menu-item-count (1+ easy-menu-item-count))
- (setq name (aref item 0))
- (let ((keyword (aref item 2)))
- (if (and (symbolp keyword)
- (= ?: (aref (symbol-name keyword) 0)))
- (let ((count 2)
- style selected active keys
- arg)
- (while (> (length item) count)
- (setq keyword (aref item count))
- (setq arg (aref item (1+ count)))
- (setq count (+ 2 count))
- (cond ((eq keyword ':keys)
- (setq keys arg))
- ((eq keyword ':active)
- (setq active arg))
- ((eq keyword ':suffix)
- (setq name (concat name " " arg)))
- ((eq keyword ':style)
- (setq style arg))
- ((eq keyword ':selected)
- (setq selected arg))))
- (if keys
- (setq name (concat name " (" keys ")")))
- (if (eq style 'toggle)
- ;; Simulate checkboxes.
- (setq name (concat "Toggle " name)))
- (if active
- (put command 'menu-enable active)
- (and (eq style 'radio)
- selected
- ;; Simulate radio buttons with menu-enable.
- (put command 'menu-enable
- (list 'not selected)))))
- (put command 'menu-enable keyword)))
- (if (keymapp callback)
- (setq name (concat name " ...")))
- (if (symbolp callback)
- (fset command callback)
- (fset command (list 'lambda () '(interactive) callback)))
- (put command 'menu-alias t)))
- (if (null command)
- ;; Handle inactive strings specially--allow any number
- ;; of identical ones.
- (setcdr menu (cons (list nil name) (cdr menu)))
- (if name
- (define-key menu (vector (intern name)) (cons name command)))))
- (setq menu-items (cdr menu-items)))
- menu))
-
- (defun easy-menu-change (path name items)
- "Change menu found at PATH as item NAME to contain ITEMS.
- PATH is a list of strings for locating the menu containing NAME in the
- menu bar. ITEMS is a list of menu items, as in `easy-menu-define'.
- These items entirely replace the previous items in that map.
-
- Call this from `activate-menubar-hook' to implement dynamic menus."
- (let ((map (key-binding (apply 'vector
- 'menu-bar
- (mapcar 'intern (append path (list name)))))))
- (if (keymapp map)
- (setcdr map (cdr (easy-menu-create-keymaps name items)))
- (error "Malformed menu in `easy-menu-change'"))))
-
- (defun easy-menu-remove (menu))
-
- (defun easy-menu-add (menu &optional map))
-
- (provide 'easymenu)
-
- ;;; easymenu.el ends here
-