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1 ;;; easymenu.el - Easy menu support for Emacs 19 and XEmacs.
2
3 ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
4
5 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
6 ;; Maintainer: XEmacs Development Team
7 ;; Keywords: internal, extensions, dumped
8
9 ;; This file is part of XEmacs.
10
11 ;; XEmacs 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 2, or (at your option)
14 ;; any later version.
15
16 ;; XEmacs 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 XEmacs; if not, write to the Free Software
23 ;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
24 ;; 02111-1307, USA.
25
26 ;;; Synched up with: Not synched with FSF but coordinated with the FSF
27 ;;; easymenu maintor for compatability with FSF 20.4.
28 ;;; Please: Coordinate changes with Inge Frick <inge@nada.kth.se>
29
30 ;; Commentary:
31
32 ;; This file is dumped with XEmacs.
33
34 ;; Easymenu allows you to define menus for both Emacs 19 and XEmacs.
35
36 ;; This file
37 ;; The advantages of using easymenu are:
38
39 ;; - Easier to use than either the Emacs 19 and XEmacs menu syntax.
40
41 ;; - Common interface for Emacs 18, Emacs 19, and XEmacs.
42 ;; (The code does nothing when run under Emacs 18).
43
44 ;; The public functions are:
45
46 ;; - Function: easy-menu-define SYMBOL MAPS DOC MENU
47 ;; SYMBOL is both the name of the variable that holds the menu and
48 ;; the name of a function that will present a the menu.
49 ;; MAPS is a list of keymaps where the menu should appear in the menubar.
50 ;; DOC is the documentation string for the variable.
51 ;; MENU is an XEmacs style menu description.
52
53 ;; See the documentation for easy-menu-define for details.
54
55 ;; - Function: easy-menu-change PATH NAME ITEMS
56 ;; Change an existing menu.
57 ;; The menu must already exist and be visible on the menu bar.
58 ;; PATH is a list of strings used for locating the menu on the menu bar.
59 ;; NAME is the name of the menu.
60 ;; ITEMS is a list of menu items, as defined in `easy-menu-define'.
61
62 ;; - Function: easy-menu-add MENU [ MAP ]
63 ;; Add MENU to the current menubar in MAP.
64
65 ;; - Function: easy-menu-remove MENU
66 ;; Remove MENU from the current menubar.
67
68 ;; - Function: easy-menu-add-item
69 ;; Add item or submenu to existing menu
70
71 ;; - Function: easy-menu-item-present-p
72 ;; Locate item
73
74 ;; - Function: easy-menu-remove-item
75 ;; Delete item from menu.
76
77 ;; Emacs 19 never uses `easy-menu-add' or `easy-menu-remove', menus
78 ;; automatically appear and disappear when the keymaps specified by
79 ;; the MAPS argument to `easy-menu-define' are activated.
80
81 ;; XEmacs will bind the map to button3 in each MAPS, but you must
82 ;; explicitly call `easy-menu-add' and `easy-menu-remove' to add and
83 ;; remove menus from the menu bar.
84
85 ;;; Code:
86
87 ;; ;;;###autoload
88 (defmacro easy-menu-define (symbol maps doc menu)
89 "Define a menu bar submenu in maps MAPS, according to MENU.
90 The arguments SYMBOL and DOC are ignored; they are present for
91 compatibility only. SYMBOL is not evaluated. In other Emacs versions
92 these arguments may be used as a variable to hold the menu data, and a
93 doc string for that variable.
94
95 The first element of MENU must be a string. It is the menu bar item name.
96 The rest of the elements are menu items.
97
98 A menu item is usually a vector of three elements: [NAME CALLBACK ENABLE]
99
100 NAME is a string--the menu item name.
101
102 CALLBACK is a command to run when the item is chosen,
103 or a list to evaluate when the item is chosen.
104
105 ENABLE is an expression; the item is enabled for selection
106 whenever this expression's value is non-nil.
107
108 Alternatively, a menu item may have the form:
109
110 [ NAME CALLBACK [ KEYWORD ARG ] ... ]
111
112 Where KEYWORD is one of the symbol defined below.
113
114 :keys KEYS
115
116 KEYS is a string; a complex keyboard equivalent to this menu item.
117
118 :active ENABLE
119
120 ENABLE is an expression; the item is enabled for selection
121 whenever this expression's value is non-nil.
122
123 :suffix NAME
124
125 NAME is a string; the name of an argument to CALLBACK.
126
127 :style STYLE
128
129 STYLE is a symbol describing the type of menu item. The following are
130 defined:
131
132 toggle: A checkbox.
133 Currently just prepend the name with the string \"Toggle \".
134 radio: A radio button.
135 nil: An ordinary menu item.
136
137 :selected SELECTED
138
139 SELECTED is an expression; the checkbox or radio button is selected
140 whenever this expression's value is non-nil.
141 Currently just disable radio buttons, no effect on checkboxes.
142
143 A menu item can be a string. Then that string appears in the menu as
144 unselectable text. A string consisting solely of hyphens is displayed
145 as a solid horizontal line.
146
147 A menu item can be a list. It is treated as a submenu.
148 The first element should be the submenu name. That's used as the
149 menu item in the top-level menu. The cdr of the submenu list
150 is a list of menu items, as above."
151 `(progn
152 (defvar ,symbol nil ,doc)
153 (easy-menu-do-define (quote ,symbol) ,maps ,doc ,menu)))
154
155 (defun easy-menu-do-define (symbol maps doc menu)
156 (if (featurep 'menubar)
157 (progn
158 (set symbol menu)
159 (fset symbol (list 'lambda '(e)
160 doc
161 '(interactive "@e")
162 '(run-hooks 'activate-menubar-hook)
163 '(setq zmacs-region-stays 't)
164 (list 'popup-menu symbol))))))
165
166 (defun easy-menu-change (&rest args)
167 (when (featurep 'menubar)
168 (apply 'add-menu args)))
169
170 ;; This variable hold the easy-menu mode menus of all major and
171 ;; minor modes currently in effect in the current buffer.
172 (defvar easy-menu-all-popups nil)
173 (make-variable-buffer-local 'easy-menu-all-popups)
174
175 (defun easy-menu-add (menu &optional map)
176 "Add MENU to the current menu bar."
177 (if (featurep 'menubar)
178 (progn
179 (unless (member menu easy-menu-all-popups)
180 (push menu easy-menu-all-popups))
181 (setq mode-popup-menu (if (> (length easy-menu-all-popups) 1)
182 (cons (easy-menu-title)
183 (reverse easy-menu-all-popups))
184 (car easy-menu-all-popups)))
185
186 (cond ((null current-menubar)
187 ;; Don't add it to a non-existing menubar.
188 nil)
189 ((assoc (car menu) current-menubar)
190 ;; Already present.
191 nil)
192 ((equal current-menubar '(nil))
193 ;; Set at left if only contains right marker.
194 (set-buffer-menubar (list menu nil)))
195 (t
196 ;; Add at right.
197 (set-buffer-menubar (copy-sequence current-menubar))
198 (add-menu nil (car menu) (cdr menu)))))))
199
200 (defun easy-menu-remove (menu)
201 "Remove MENU from the current menu bar."
202 (if (featurep 'menubar)
203 (progn
204 (setq easy-menu-all-popups (delq menu easy-menu-all-popups)
205 mode-popup-menu (if (< (length easy-menu-all-popups) 1)
206 (cons (easy-menu-title)
207 (reverse easy-menu-all-popups))
208 (car easy-menu-all-popups)))
209
210 (and current-menubar
211 (assoc (car menu) current-menubar)
212 (delete-menu-item (list (car menu)))))))
213
214 (defsubst easy-menu-normalize (menu)
215 (if (symbolp menu)
216 (symbol-value menu)
217 menu))
218
219 (defun easy-menu-add-item (menu path item &optional before)
220 "At the end of the submenu of MENU with path PATH add ITEM.
221 If ITEM is already present in this submenu, then this item will be changed.
222 otherwise ITEM will be added at the end of the submenu, unless the optional
223 argument BEFORE is present, in which case ITEM will instead be added
224 before the item named BEFORE.
225 MENU is either a symbol, which have earlier been used as the first
226 argument in a call to `easy-menu-define', or the value of such a symbol
227 i.e. a menu, or nil which stands for the current menubar.
228 PATH is a list of strings for locating the submenu where ITEM is to be
229 added. If PATH is nil, MENU itself is used. Otherwise, the first
230 element should be the name of a submenu directly under MENU. This
231 submenu is then traversed recursively with the remaining elements of PATH.
232 ITEM is either defined as in `easy-menu-define', a menu defined earlier
233 by `easy-menu-define' or `easy-menu-create-menu' or an item returned
234 from `easy-menu-item-present-p' or `easy-menu-remove-item'."
235 (add-menu-button path item before (easy-menu-normalize menu)))
236
237 (defun easy-menu-item-present-p (menu path name)
238 "In submenu of MENU with path PATH, return true iff item NAME is present.
239 MENU and PATH are defined as in `easy-menu-add-item'.
240 NAME should be a string, the name of the element to be looked for.
241
242 The return value can be used as as an argument to `easy-menu-add-item'."
243 (car (find-menu-item (or (easy-menu-normalize menu) current-menubar)
244 (append path (list name)))))
245
246 (defun easy-menu-remove-item (menu path name)
247 "From submenu of MENU with path PATH remove item NAME.
248 MENU and PATH are defined as in `easy-menu-add-item'.
249 NAME should be a string, the name of the element to be removed.
250
251 The return value can be used as as an argument to `easy-menu-add-item'."
252 (delete-menu-item (append path (list name))
253 (easy-menu-normalize menu)))
254
255
256
257
258 ;; Think up a good title for the menu. Take the major-mode of the
259 ;; buffer, strip the -mode part, convert hyphens to spaces, and
260 ;; capitalize it.
261 ;;
262 ;; If you can think of something smarter, feel free to replace it.
263 ;; Don't forget to mail the change to xemacs@xemacs.org where everyone
264 ;; can flame, er, praise your changes.
265 (defun easy-menu-title ()
266 (capitalize (replace-in-string (replace-in-string
267 (symbol-name major-mode) "-mode$" "")
268 "-" " ")))
269
270 (provide 'easymenu)
271
272 ;;; easymenu.el ends here