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209
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1 ;;; easymenu.el - Easy menu support for Emacs 19 and XEmacs.
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2
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3 ;; Copyright (C) 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
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4
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5 ;; Author: Per Abrahamsen <abraham@dina.kvl.dk>
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6 ;; Maintainer: XEmacs Development Team
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7 ;; Keywords: internal, extensions, dumped
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify
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12 ;; it under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful,
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17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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19 ;; GNU General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; if not, write to the Free Software
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23 ;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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24 ;; 02111-1307, USA.
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25
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26 ;;; Synched up with: Not synched with FSF.
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27
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28 ;; Commentary:
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29
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30 ;; This file is dumped with XEmacs.
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31
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32 ;; Easymenu allows you to define menus for both Emacs 19 and XEmacs.
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33
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34 ;; This file
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35 ;; The advantages of using easymenu are:
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36
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37 ;; - Easier to use than either the Emacs 19 and XEmacs menu syntax.
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38
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39 ;; - Common interface for Emacs 18, Emacs 19, and XEmacs.
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40 ;; (The code does nothing when run under Emacs 18).
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41
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42 ;; The public functions are:
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43
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44 ;; - Function: easy-menu-define SYMBOL MAPS DOC MENU
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45 ;; SYMBOL is both the name of the variable that holds the menu and
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46 ;; the name of a function that will present a the menu.
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47 ;; MAPS is a list of keymaps where the menu should appear in the menubar.
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48 ;; DOC is the documentation string for the variable.
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49 ;; MENU is an XEmacs style menu description.
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50
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51 ;; See the documentation for easy-menu-define for details.
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52
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53 ;; - Function: easy-menu-change PATH NAME ITEMS
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54 ;; Change an existing menu.
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55 ;; The menu must already exist and be visible on the menu bar.
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56 ;; PATH is a list of strings used for locating the menu on the menu bar.
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57 ;; NAME is the name of the menu.
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58 ;; ITEMS is a list of menu items, as defined in `easy-menu-define'.
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59
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60 ;; - Function: easy-menu-add MENU [ MAP ]
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61 ;; Add MENU to the current menubar in MAP.
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62
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63 ;; - Function: easy-menu-remove MENU
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64 ;; Remove MENU from the current menubar.
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65
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66 ;; Emacs 19 never uses `easy-menu-add' or `easy-menu-remove', menus
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67 ;; automatically appear and disappear when the keymaps specified by
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68 ;; the MAPS argument to `easy-menu-define' are activated.
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69
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70 ;; XEmacs will bind the map to button3 in each MAPS, but you must
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71 ;; explicitly call `easy-menu-add' and `easy-menu-remove' to add and
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72 ;; remove menus from the menu bar.
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73
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74 ;;; Code:
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75
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76 ;; ;;;###autoload
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77 (defmacro easy-menu-define (symbol maps doc menu)
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78 "Define a menu bar submenu in maps MAPS, according to MENU.
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79 The arguments SYMBOL and DOC are ignored; they are present for
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80 compatibility only. SYMBOL is not evaluated. In other Emacs versions
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81 these arguments may be used as a variable to hold the menu data, and a
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82 doc string for that variable.
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83
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84 The first element of MENU must be a string. It is the menu bar item name.
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85 The rest of the elements are menu items.
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86
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87 A menu item is usually a vector of three elements: [NAME CALLBACK ENABLE]
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88
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89 NAME is a string--the menu item name.
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90
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91 CALLBACK is a command to run when the item is chosen,
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92 or a list to evaluate when the item is chosen.
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93
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94 ENABLE is an expression; the item is enabled for selection
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95 whenever this expression's value is non-nil.
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96
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97 Alternatively, a menu item may have the form:
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98
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99 [ NAME CALLBACK [ KEYWORD ARG ] ... ]
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100
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101 Where KEYWORD is one of the symbol defined below.
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102
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103 :keys KEYS
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104
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105 KEYS is a string; a complex keyboard equivalent to this menu item.
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106
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107 :active ENABLE
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108
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109 ENABLE is an expression; the item is enabled for selection
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110 whenever this expression's value is non-nil.
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111
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112 :suffix NAME
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113
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114 NAME is a string; the name of an argument to CALLBACK.
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115
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116 :style STYLE
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117
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118 STYLE is a symbol describing the type of menu item. The following are
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119 defined:
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120
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121 toggle: A checkbox.
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122 Currently just prepend the name with the string \"Toggle \".
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123 radio: A radio button.
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124 nil: An ordinary menu item.
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125
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126 :selected SELECTED
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127
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128 SELECTED is an expression; the checkbox or radio button is selected
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129 whenever this expression's value is non-nil.
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130 Currently just disable radio buttons, no effect on checkboxes.
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131
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132 A menu item can be a string. Then that string appears in the menu as
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133 unselectable text. A string consisting solely of hyphens is displayed
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134 as a solid horizontal line.
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135
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136 A menu item can be a list. It is treated as a submenu.
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137 The first element should be the submenu name. That's used as the
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138 menu item in the top-level menu. The cdr of the submenu list
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139 is a list of menu items, as above."
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140 (` (progn
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141 (defvar (, symbol) nil (, doc))
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142 (easy-menu-do-define (quote (, symbol)) (, maps) (, doc) (, menu)))))
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143
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144 (defun easy-menu-do-define (symbol maps doc menu)
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145 (if (featurep 'menubar)
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146 (progn
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147 (set symbol menu)
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148 (fset symbol (list 'lambda '(e)
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149 doc
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150 '(interactive "@e")
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151 '(run-hooks 'activate-menubar-hook)
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152 '(setq zmacs-region-stays 't)
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153 (list 'popup-menu symbol))))))
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154
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155 (defun easy-menu-change (&rest args)
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156 (when (featurep 'menubar)
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157 (apply 'add-menu args)))
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158
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159 ;; This variable hold the easy-menu mode menus of all major and
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160 ;; minor modes currently in effect in the current buffer.
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161 (defvar easy-menu-all-popups nil)
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162 (make-variable-buffer-local 'easy-menu-all-popups)
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163
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164 (defun easy-menu-add (menu &optional map)
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165 "Add MENU to the current menu bar."
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166 (if (featurep 'menubar)
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167 (progn
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168 (unless (member menu easy-menu-all-popups)
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169 (push menu easy-menu-all-popups))
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170 (setq mode-popup-menu (if (> (length easy-menu-all-popups) 1)
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171 (cons (easy-menu-title)
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172 (reverse easy-menu-all-popups))
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173 (car easy-menu-all-popups)))
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174
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175 (cond ((null current-menubar)
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176 ;; Don't add it to a non-existing menubar.
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177 nil)
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178 ((assoc (car menu) current-menubar)
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179 ;; Already present.
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180 nil)
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181 ((equal current-menubar '(nil))
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182 ;; Set at left if only contains right marker.
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183 (set-buffer-menubar (list menu nil)))
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184 (t
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185 ;; Add at right.
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186 (set-buffer-menubar (copy-sequence current-menubar))
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187 (add-menu nil (car menu) (cdr menu)))))))
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188
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189 (defun easy-menu-remove (menu)
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190 "Remove MENU from the current menu bar."
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191 (if (featurep 'menubar)
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192 (progn
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193 (setq easy-menu-all-popups (delq menu easy-menu-all-popups)
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194 mode-popup-menu (if (< (length easy-menu-all-popups) 1)
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195 (cons (easy-menu-title)
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196 (reverse easy-menu-all-popups))
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197 (car easy-menu-all-popups)))
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198
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199 (and current-menubar
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200 (assoc (car menu) current-menubar)
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201 (delete-menu-item (list (car menu)))))))
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202
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203 ;; Think up a good title for the menu. Take the major-mode of the
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204 ;; buffer, strip the -mode part, convert hyphens to spaces, and
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205 ;; capitalize it.
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206 ;;
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207 ;; If you can think of something smarter, feel free to replace it.
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208 ;; Don't forget to mail the change to xemacs@xemacs.org where everyone
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209 ;; can flame, er, praise your changes.
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210 (defun easy-menu-title ()
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211 (capitalize (replace-in-string (replace-in-string
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212 (symbol-name major-mode) "-mode$" "")
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213 "-" " ")))
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214
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215 (provide 'easymenu)
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216
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217 ;;; easymenu.el ends here
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