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