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428
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1 /* Implements an elisp-programmable menubar.
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2 Copyright (C) 1993, 1994 Free Software Foundation, Inc.
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3 Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not in FSF. */
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23
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24 /* #### There ain't much here because menubars have not been
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25 properly abstracted yet. */
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26
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27 #include <config.h>
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28 #include "lisp.h"
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29
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30 #include "buffer.h"
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31 #include "device.h"
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32 #include "frame.h"
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33 #include "gui.h"
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34 #include "menubar.h"
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35 #include "redisplay.h"
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36 #include "window.h"
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37
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38 int menubar_show_keybindings;
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39 Lisp_Object Vmenubar_configuration;
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40
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41 Lisp_Object Qcurrent_menubar;
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42
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43 Lisp_Object Qactivate_menubar_hook, Vactivate_menubar_hook;
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44
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45 Lisp_Object Vmenubar_visible_p;
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46
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47 static Lisp_Object Vcurrent_menubar; /* DO NOT ever reference this.
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48 Always go through Qcurrent_menubar.
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49 See below. */
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50
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51 Lisp_Object Vblank_menubar;
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52
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53 int popup_menu_titles;
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54
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55 Lisp_Object Vmenubar_pointer_glyph;
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56
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57 static int
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58 menubar_variable_changed (Lisp_Object sym, Lisp_Object *val,
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59 Lisp_Object in_object, int flags)
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60 {
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61 MARK_MENUBAR_CHANGED;
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62 return 0;
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63 }
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64
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65 void
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66 update_frame_menubars (struct frame *f)
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67 {
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68 if (f->menubar_changed || f->windows_changed)
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69 MAYBE_FRAMEMETH (f, update_frame_menubars, (f));
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70
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71 f->menubar_changed = 0;
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72 }
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73
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74 void
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75 free_frame_menubars (struct frame *f)
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76 {
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77 /* If we had directly allocated any memory for the menubars instead
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78 of using all Lisp_Objects this is where we would now free it. */
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79
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80 MAYBE_FRAMEMETH (f, free_frame_menubars, (f));
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81 }
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82
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83 static void
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84 menubar_visible_p_changed (Lisp_Object specifier, struct window *w,
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85 Lisp_Object oldval)
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86 {
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87 MARK_MENUBAR_CHANGED;
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88 }
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89
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90 static void
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91 menubar_visible_p_changed_in_frame (Lisp_Object specifier, struct frame *f,
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92 Lisp_Object oldval)
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93 {
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94 update_frame_menubars (f);
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95 }
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96
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97 Lisp_Object
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98 current_frame_menubar (CONST struct frame* f)
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99 {
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100 struct window *w = XWINDOW (FRAME_LAST_NONMINIBUF_WINDOW (f));
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101 return symbol_value_in_buffer (Qcurrent_menubar, w->buffer);
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102 }
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103
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104 Lisp_Object
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105 menu_parse_submenu_keywords (Lisp_Object desc, Lisp_Object gui_item)
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106 {
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107 struct Lisp_Gui_Item* pgui_item = XGUI_ITEM (gui_item);
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108
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109 /* Menu descriptor should be a list */
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110 CHECK_CONS (desc);
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111
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112 /* First element may be menu name, although can be omitted.
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113 Let's think that if stuff begins with anything than a keyword
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114 or a list (submenu), this is a menu name, expected to be a string */
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115 if (!KEYWORDP (XCAR (desc)) && !CONSP (XCAR (desc)))
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116 {
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117 CHECK_STRING (XCAR (desc));
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118 pgui_item->name = XCAR (desc);
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119 desc = XCDR (desc);
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120 if (!NILP (desc))
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121 CHECK_CONS (desc);
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122 }
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123
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124 /* Walk along all key-value pairs */
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125 while (!NILP(desc) && KEYWORDP (XCAR (desc)))
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126 {
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127 Lisp_Object key, val;
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128 key = XCAR (desc);
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129 desc = XCDR (desc);
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130 CHECK_CONS (desc);
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131 val = XCAR (desc);
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132 desc = XCDR (desc);
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133 if (!NILP (desc))
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134 CHECK_CONS (desc);
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135 gui_item_add_keyval_pair (gui_item, key, val, ERROR_ME);
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136 }
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137
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138 /* Return the rest - supposed to be a list of items */
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139 return desc;
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140 }
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141
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142 DEFUN ("menu-find-real-submenu", Fmenu_find_real_submenu, 2, 2, 0, /*
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143 Find a submenu descriptor within DESC by following PATH.
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144 This function finds a submenu descriptor, either from the description
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145 DESC or generated by a filter within DESC. The function regards :config
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146 and :included keywords in the DESC, and expands submenus along the
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147 PATH using :filter functions. Return value is a descriptor for the
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148 submenu, NOT expanded and NOT checked against :config and :included.
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149 Also, individual menu items are not looked for, only submenus.
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150
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151 See also 'find-menu-item'.
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152 */
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153 (desc, path))
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154 {
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155 Lisp_Object path_entry, submenu_desc, submenu;
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156 struct gcpro gcpro1;
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157 Lisp_Object gui_item = allocate_gui_item ();
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158 struct Lisp_Gui_Item* pgui_item = XGUI_ITEM (gui_item);
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159
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160 GCPRO1 (gui_item);
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161
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162 EXTERNAL_LIST_LOOP (path_entry, path)
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163 {
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164 /* Verify that DESC describes a menu, not single item */
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165 if (!CONSP (desc))
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166 RETURN_UNGCPRO (Qnil);
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167
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168 /* Parse this menu */
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169 desc = menu_parse_submenu_keywords (desc, gui_item);
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170
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171 /* Check that this (sub)menu is active */
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172 if (!gui_item_active_p (gui_item))
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173 RETURN_UNGCPRO (Qnil);
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174
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175 /* Apply :filter */
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176 if (!NILP (pgui_item->filter))
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177 desc = call1 (pgui_item->filter, desc);
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178
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179 /* Find the next menu on the path inside this one */
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180 EXTERNAL_LIST_LOOP (submenu_desc, desc)
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181 {
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182 submenu = XCAR (submenu_desc);
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183 if (CONSP (submenu)
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184 && STRINGP (XCAR (submenu))
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185 && !NILP (Fstring_equal (XCAR (submenu), XCAR (path_entry))))
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186 {
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187 desc = submenu;
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188 goto descend;
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189 }
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190 }
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191 /* Submenu not found */
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192 RETURN_UNGCPRO (Qnil);
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193
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194 descend:
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195 /* Prepare for the next iteration */
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196 gui_item_init (gui_item);
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197 }
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198
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199 /* We have successfully descended down the end of the path */
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200 UNGCPRO;
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201 return desc;
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202 }
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203
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204 DEFUN ("popup-menu", Fpopup_menu, 1, 2, 0, /*
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205 Pop up the given menu.
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206 A menu description is a list of menu items, strings, and submenus.
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207
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208 The first element of a menu must be a string, which is the name of the menu.
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209 This is the string that will be displayed in the parent menu, if any. For
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210 toplevel menus, it is ignored. This string is not displayed in the menu
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211 itself.
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212
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213 If an element of a menu is a string, then that string will be presented in
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214 the menu as unselectable text.
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215
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216 If an element of a menu is a string consisting solely of hyphens, then that
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217 item will be presented as a solid horizontal line.
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218
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219 If an element of a menu is a list, it is treated as a submenu. The name of
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220 that submenu (the first element in the list) will be used as the name of the
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221 item representing this menu on the parent.
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222
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223 Otherwise, the element must be a vector, which describes a menu item.
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224 A menu item can have any of the following forms:
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225
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226 [ "name" callback <active-p> ]
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227 [ "name" callback <active-p> <suffix> ]
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228 [ "name" callback :<keyword> <value> :<keyword> <value> ... ]
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229
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230 The name is the string to display on the menu; it is filtered through the
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231 resource database, so it is possible for resources to override what string
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232 is actually displayed.
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233
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234 If the `callback' of a menu item is a symbol, then it must name a command.
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235 It will be invoked with `call-interactively'. If it is a list, then it is
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236 evaluated with `eval'.
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237
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238 The possible keywords are this:
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239
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240 :active <form> Same as <active-p> in the first two forms: the
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241 expression is evaluated just before the menu is
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242 displayed, and the menu will be selectable only if
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243 the result is non-nil.
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244
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245 :suffix <form> Same as <suffix> in the second form: the expression
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246 is evaluated just before the menu is displayed and
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247 resulting string is appended to the displayed name,
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248 providing a convenient way of adding the name of a
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249 command's ``argument'' to the menu, like
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250 ``Kill Buffer NAME''.
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251
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252 :keys "string" Normally, the keyboard equivalents of commands in
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253 menus are displayed when the `callback' is a symbol.
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254 This can be used to specify keys for more complex menu
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255 items. It is passed through `substitute-command-keys'
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256 first.
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257
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258 :style <style> Specifies what kind of object this menu item is:
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259
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260 nil A normal menu item.
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261 toggle A toggle button.
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262 radio A radio button.
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263
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264 The only difference between toggle and radio buttons is
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265 how they are displayed. But for consistency, a toggle
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266 button should be used when there is one option whose
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267 value can be turned on or off, and radio buttons should
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268 be used when there is a set of mutually exclusive
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269 options. When using a group of radio buttons, you
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270 should arrange for no more than one to be marked as
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271 selected at a time.
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272
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273 :selected <form> Meaningful only when STYLE is `toggle' or `radio'.
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274 This specifies whether the button will be in the
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275 selected or unselected state.
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276
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277 For example:
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278
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279 [ "Save As..." write-file t ]
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280 [ "Revert Buffer" revert-buffer (buffer-modified-p) ]
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281 [ "Read Only" toggle-read-only :style toggle :selected buffer-read-only ]
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282
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283 See menubar.el for many more examples.
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284 */
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285 (menu_desc, event))
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286 {
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287 struct frame *f = decode_frame(Qnil);
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288 MAYBE_FRAMEMETH (f, popup_menu, (menu_desc,event));
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289 return Qnil;
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290 }
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291
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292 DEFUN ("normalize-menu-item-name", Fnormalize_menu_item_name, 1, 2, 0, /*
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293 Convert a menu item name string into normal form, and return the new string.
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294 Menu item names should be converted to normal form before being compared.
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295 */
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296 (name, buffer))
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297 {
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298 struct buffer *buf = decode_buffer (buffer, 0);
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299 struct Lisp_String *n;
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300 Charcount end;
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301 int i;
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302 Bufbyte *name_data;
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303 Bufbyte *string_result;
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304 Bufbyte *string_result_ptr;
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305 Emchar elt;
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306 int expecting_underscore = 0;
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307
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308 CHECK_STRING (name);
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309
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310 n = XSTRING (name);
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311 end = string_char_length (n);
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312 name_data = string_data (n);
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313
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314 string_result = (Bufbyte *) alloca (end * MAX_EMCHAR_LEN);
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315 string_result_ptr = string_result;
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316 for (i = 0; i < end; i++)
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317 {
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318 elt = charptr_emchar (name_data);
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319 elt = DOWNCASE (buf, elt);
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320 if (expecting_underscore)
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321 {
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322 expecting_underscore = 0;
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323 switch (elt)
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324 {
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325 case '%':
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326 /* Allow `%%' to mean `%'. */
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327 string_result_ptr += set_charptr_emchar (string_result_ptr, '%');
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328 break;
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329 case '_':
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330 break;
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331 default:
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332 string_result_ptr += set_charptr_emchar (string_result_ptr, '%');
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333 string_result_ptr += set_charptr_emchar (string_result_ptr, elt);
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334 }
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335 }
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336 else if (elt == '%')
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337 expecting_underscore = 1;
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338 else
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339 string_result_ptr += set_charptr_emchar (string_result_ptr, elt);
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340 INC_CHARPTR (name_data);
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341 }
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342
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343 return make_string (string_result, string_result_ptr - string_result);
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344 }
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345
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346 void
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347 syms_of_menubar (void)
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348 {
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349 defsymbol (&Qcurrent_menubar, "current-menubar");
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350 DEFSUBR (Fpopup_menu);
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351 DEFSUBR (Fnormalize_menu_item_name);
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352 DEFSUBR (Fmenu_find_real_submenu);
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353 }
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354
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355 void
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356 vars_of_menubar (void)
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357 {
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358 {
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359 /* put in Vblank_menubar a menubar value which has no visible
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360 * items. This is a bit tricky due to various quirks. We
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361 * could use '(["" nil nil]), but this is apparently equivalent
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362 * to '(nil), and a new frame created with this menubar will
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363 * get a vertically-squished menubar. If we use " " as the
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364 * button title instead of "", we get an etched button border.
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365 * So we use
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366 * '(("No active menubar" ["" nil nil]))
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367 * which creates a menu whose title is "No active menubar",
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368 * and this works fine.
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369 */
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370
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371 Lisp_Object menu_item[3];
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372 static CONST char *blank_msg = "No active menubar";
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373
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374 menu_item[0] = build_string ("");
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375 menu_item[1] = Qnil;
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376 menu_item[2] = Qnil;
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377 Vblank_menubar = Fcons (Fcons (build_string (blank_msg),
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378 Fcons (Fvector (3, &menu_item[0]),
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379 Qnil)),
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380 Qnil);
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381 staticpro (&Vblank_menubar);
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382 }
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383
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384 DEFVAR_BOOL ("popup-menu-titles", &popup_menu_titles /*
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385 If true, popup menus will have title bars at the top.
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386 */ );
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387 popup_menu_titles = 1;
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388
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389 /* #### Replace current menubar with a specifier. */
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390
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391 /* All C code must access the menubar via Qcurrent_menubar
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392 because it can be buffer-local. Note that Vcurrent_menubar
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393 doesn't need to exist at all, except for the magic function. */
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394
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395 DEFVAR_LISP_MAGIC ("current-menubar", &Vcurrent_menubar /*
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396 The current menubar. This may be buffer-local.
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397
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398 When the menubar is changed, the function `set-menubar-dirty-flag' has to
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399 be called for the menubar to be updated on the frame. See `set-menubar'
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400 and `set-buffer-menubar'.
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401
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402 A menubar is a list of menus and menu-items.
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403 A menu is a list of menu items, keyword-value pairs, strings, and submenus.
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404
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405 The first element of a menu must be a string, which is the name of the menu.
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406 This is the string that will be displayed in the parent menu, if any. For
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407 toplevel menus, it is ignored. This string is not displayed in the menu
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408 itself.
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409
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410 Immediately following the name string of the menu, any of three
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411 optional keyword-value pairs is permitted.
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412
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413 If an element of a menu (or menubar) is a string, then that string will be
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414 presented as unselectable text.
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415
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416 If an element of a menu is a string consisting solely of hyphens, then that
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417 item will be presented as a solid horizontal line.
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418
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419 If an element of a menu is a list, it is treated as a submenu. The name of
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420 that submenu (the first element in the list) will be used as the name of the
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421 item representing this menu on the parent.
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422
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423 If an element of a menubar is `nil', then it is used to represent the
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424 division between the set of menubar-items which are flushleft and those
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425 which are flushright.
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426
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427 Otherwise, the element must be a vector, which describes a menu item.
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428 A menu item can have any of the following forms:
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429
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430 [ "name" callback <active-p> ]
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431 [ "name" callback <active-p> <suffix> ]
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432 [ "name" callback :<keyword> <value> :<keyword> <value> ... ]
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433
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434 The name is the string to display on the menu; it is filtered through the
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435 resource database, so it is possible for resources to override what string
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436 is actually displayed.
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437
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438 If the `callback' of a menu item is a symbol, then it must name a command.
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439 It will be invoked with `call-interactively'. If it is a list, then it is
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440 evaluated with `eval'.
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441
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442 The possible keywords are this:
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443
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444 :active <form> Same as <active-p> in the first two forms: the
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445 expression is evaluated just before the menu is
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446 displayed, and the menu will be selectable only if
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447 the result is non-nil.
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448
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449 :suffix <form> Same as <suffix> in the second form: the expression
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450 is evaluated just before the menu is displayed and
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451 resulting string is appended to the displayed name,
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452 providing a convenient way of adding the name of a
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453 command's ``argument'' to the menu, like
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454 ``Kill Buffer NAME''.
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455
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456 :keys "string" Normally, the keyboard equivalents of commands in
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457 menus are displayed when the `callback' is a symbol.
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458 This can be used to specify keys for more complex menu
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459 items. It is passed through `substitute-command-keys'
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460 first.
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461
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462 :style <style> Specifies what kind of object this menu item is:
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463
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464 nil A normal menu item.
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465 toggle A toggle button.
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466 radio A radio button.
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467 button A menubar button.
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468
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469 The only difference between toggle and radio buttons is
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470 how they are displayed. But for consistency, a toggle
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471 button should be used when there is one option whose
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472 value can be turned on or off, and radio buttons should
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473 be used when there is a set of mutually exclusive
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474 options. When using a group of radio buttons, you
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475 should arrange for no more than one to be marked as
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476 selected at a time.
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477
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478 :selected <form> Meaningful only when STYLE is `toggle', `radio' or
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479 `button'. This specifies whether the button will be in
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480 the selected or unselected state.
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481
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482 :included <form> This can be used to control the visibility of a menu or
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483 menu item. The form is evaluated and the menu or menu
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484 item is only displayed if the result is non-nil.
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485
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486 :config <symbol> This is an efficient shorthand for
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487 :included (memq symbol menubar-configuration)
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488 See the variable `menubar-configuration'.
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489
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490 :filter <function> A menu filter can only be used in a menu item list.
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491 (i.e.: not in a menu item itself). It is used to
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492 sensitize or incrementally create a submenu only when
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493 it is selected by the user and not every time the
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494 menubar is activated. The filter function is passed
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495 the list of menu items in the submenu and must return a
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496 list of menu items to be used for the menu. It is
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497 called only when the menu is about to be displayed, so
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498 other menus may already be displayed. Vile and
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499 terrible things will happen if a menu filter function
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500 changes the current buffer, window, or frame. It
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501 also should not raise, lower, or iconify any frames.
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502 Basically, the filter function should have no
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503 side-effects.
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504
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505 :key-sequence keys Used in FSF Emacs as an hint to an equivalent keybinding.
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506 Ignored by XEnacs for easymenu.el compatability.
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507
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508 :label <form> (unimplemented!) Like :suffix, but replaces label
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509 completely.
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510 (might be added in 21.2).
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511
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512 For example:
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513
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514 ("File"
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515 :filter file-menu-filter ; file-menu-filter is a function that takes
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516 ; one argument (a list of menu items) and
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517 ; returns a list of menu items
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518 [ "Save As..." write-file t ]
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519 [ "Revert Buffer" revert-buffer (buffer-modified-p) ]
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520 [ "Read Only" toggle-read-only :style toggle
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521 :selected buffer-read-only ]
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522 )
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523
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524 See x-menubar.el for many more examples.
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525
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526 After the menubar is clicked upon, but before any menus are popped up,
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527 the functions on the `activate-menubar-hook' are invoked to make top-level
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528 changes to the menus and menubar. Note, however, that the use of menu
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529 filters (using the :filter keyword) is usually a more efficient way to
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530 dynamically alter or sensitize menus.
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|
531 */, menubar_variable_changed);
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532
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533 Vcurrent_menubar = Qnil;
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534
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535 DEFVAR_LISP ("activate-menubar-hook", &Vactivate_menubar_hook /*
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536 Function or functions called before a menubar menu is pulled down.
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537 These functions are called with no arguments, and should interrogate and
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538 modify the value of `current-menubar' as desired.
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539
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540 The functions on this hook are invoked after the mouse goes down, but before
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541 the menu is mapped, and may be used to activate, deactivate, add, or delete
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542 items from the menus. However, it is probably the case that using a :filter
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|
543 keyword in a submenu would be a more efficient way of updating menus. See
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544 the documentation of `current-menubar'.
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545
|
|
|
546 These functions may return the symbol `t' to assert that they have made
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547 no changes to the menubar. If any other value is returned, the menubar is
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|
548 recomputed. If `t' is returned but the menubar has been changed, then the
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549 changes may not show up right away. Returning `nil' when the menubar has
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550 not changed is not so bad; more computation will be done, but redisplay of
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|
551 the menubar will still be performed optimally.
|
|
|
552 */ );
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|
|
553 Vactivate_menubar_hook = Qnil;
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|
554 defsymbol (&Qactivate_menubar_hook, "activate-menubar-hook");
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|
|
555
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|
|
556 DEFVAR_BOOL ("menubar-show-keybindings", &menubar_show_keybindings /*
|
|
|
557 If true, the menubar will display keyboard equivalents.
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|
|
558 If false, only the command names will be displayed.
|
|
|
559 */ );
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|
|
560 menubar_show_keybindings = 1;
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|
|
561
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|
|
562 DEFVAR_LISP_MAGIC ("menubar-configuration", &Vmenubar_configuration /*
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|
|
563 A list of symbols, against which the value of the :config tag for each
|
|
|
564 menubar item will be compared. If a menubar item has a :config tag, then
|
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565 it is omitted from the menubar if that tag is not a member of the
|
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|
566 `menubar-configuration' list.
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|
|
567 */ , menubar_variable_changed);
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|
|
568 Vmenubar_configuration = Qnil;
|
|
|
569
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|
|
570 DEFVAR_LISP ("menubar-pointer-glyph", &Vmenubar_pointer_glyph /*
|
|
|
571 *The shape of the mouse-pointer when over the menubar.
|
|
|
572 This is a glyph; use `set-glyph-image' to change it.
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|
|
573 If unspecified in a particular domain, the window-system-provided
|
|
|
574 default pointer is used.
|
|
|
575 */ );
|
|
|
576
|
|
|
577 Fprovide (intern ("menubar"));
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|
|
578 }
|
|
|
579
|
|
|
580 void
|
|
|
581 specifier_vars_of_menubar (void)
|
|
|
582 {
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|
|
583 DEFVAR_SPECIFIER ("menubar-visible-p", &Vmenubar_visible_p /*
|
|
|
584 *Whether the menubar is visible.
|
|
|
585 This is a specifier; use `set-specifier' to change it.
|
|
|
586 */ );
|
|
|
587 Vmenubar_visible_p = Fmake_specifier (Qboolean);
|
|
|
588
|
|
|
589 set_specifier_fallback (Vmenubar_visible_p, list1 (Fcons (Qnil, Qt)));
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|
|
590 set_specifier_caching (Vmenubar_visible_p,
|
|
|
591 slot_offset (struct window,
|
|
|
592 menubar_visible_p),
|
|
|
593 menubar_visible_p_changed,
|
|
|
594 slot_offset (struct frame,
|
|
|
595 menubar_visible_p),
|
|
|
596 menubar_visible_p_changed_in_frame);
|
|
|
597 }
|
|
|
598
|
|
|
599 void
|
|
|
600 complex_vars_of_menubar (void)
|
|
|
601 {
|
|
|
602 Vmenubar_pointer_glyph = Fmake_glyph_internal (Qpointer);
|
|
|
603 }
|
