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414
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1 ;; font-menu.el --- Managing menus of fonts.
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2
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3 ;; Copyright (C) 1994 Free Software Foundation, Inc.
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4 ;; Copyright (C) 1995 Tinker Systems and INS Engineering Corp.
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5 ;; Copyright (C) 1997 Sun Microsystems
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6
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7 ;; Adapted from x-font-menu.el by Andy Piper <andy@xemacs.org>
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8
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9 ;; This file is part of XEmacs.
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10
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11 ;; XEmacs is free software; you can redistribute it and/or modify it
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12 ;; under the terms of the GNU General Public License as published by
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13 ;; the Free Software Foundation; either version 2, or (at your option)
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14 ;; any later version.
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15
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16 ;; XEmacs is distributed in the hope that it will be useful, but
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17 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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19 ;; General Public License for more details.
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20
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21 ;; You should have received a copy of the GNU General Public License
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22 ;; along with XEmacs; see the file COPYING. If not, write to the
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23 ;; Free Software Foundation, 59 Temple Place - Suite 330,
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24 ;; Boston, MA 02111-1307, USA.
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25
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26 ;; This file contains the device-nospecific font menu stuff
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27
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28 ;;; Commentary:
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29 ;;;
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30 ;;; Creates three menus, "Font", "Size", and "Weight", and puts them on the
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31 ;;; "Options" menu. The contents of these menus are the superset of those
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32 ;;; properties available on any fonts, but only the intersection of the three
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33 ;;; sets is selectable at one time.
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34 ;;;
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35 ;;; Known Problems:
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36 ;;; ===============
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37 ;;; Items on the Font menu are selectable if and only if that font exists in
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38 ;;; the same size and weight as the current font. This means that some fonts
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39 ;;; are simply not reachable from some other fonts - if only one font comes
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40 ;;; in only one point size (like "Nil", which comes only in 2), you will never
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41 ;;; be able to select it. It would be better if the items on the Fonts menu
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42 ;;; were always selectable, and selecting them would set the size to be the
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43 ;;; closest size to the current font's size.
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44 ;;;
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45 ;;; This attempts to change all other faces in an analagous way to the change
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46 ;;; that was made to the default face; if it can't, it will skip over the face.
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47 ;;; However, this could leave incongruous font sizes around, which may cause
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48 ;;; some nonreversibility problems if further changes are made. Perhaps it
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49 ;;; should remember the initial fonts of all faces, and derive all subsequent
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50 ;;; fonts from that initial state.
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51 ;;;
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52 ;;; xfontsel(1) is a lot more flexible (but probably harder to understand).
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53 ;;;
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54 ;;; The code to construct menus from all of the x11 fonts available from the
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55 ;;; server is autoloaded and executed the very first time that one of the Font
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56 ;;; menus is selected on each device. That is, if XEmacs has frames on two
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57 ;;; different devices, then separate font menu information will be maintained
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58 ;;; for each X display. If the font path changes after emacs has already
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59 ;;; asked the X server on a particular display for its list of fonts, this
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60 ;;; won't notice. Also, the first time that a font menu is posted on each
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61 ;;; display will entail a lengthy delay, but that's better than slowing down
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62 ;;; XEmacs startup. At any time (i.e.: after a font-path change or
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63 ;;; immediately after device creation), you can call
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64 ;;; `reset-device-font-menus' to rebuild the menus from all currently
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65 ;;; available fonts.
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66 ;;;
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67 ;;; There is knowledge here about the regexp match numbers in
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68 ;;; `mswindows-font-regexp' and `mswindows-font-regexp-foundry-and-family' defined in
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69 ;;; mswindows-faces.el.
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70 ;;;
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71 ;;; There are at least three kinds of fonts under X11r5:
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72 ;;;
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73 ;;; - bitmap fonts, which can be assumed to look as good as possible;
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74 ;;; - bitmap fonts which have been (or can be) automatically scaled to
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75 ;;; a new size, and which almost always look awful;
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76 ;;; - and true outline fonts, which should look ok at any size, but in
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77 ;;; practice (on at least some systems) look awful at any size, and
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78 ;;; even in theory are unlikely ever to look as good as non-scaled
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79 ;;; bitmap fonts.
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80 ;;;
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81 ;;; It would be nice to get this code to look for non-scaled bitmap fonts
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82 ;;; first, then outline fonts, then scaled bitmap fonts as a last resort.
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83 ;;; But it's not clear to me how to tell them apart based on their truenames
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84 ;;; and/or the result of XListFonts(). I welcome any and all explanations
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85 ;;; of the subtleties involved...
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86 ;;;
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87 ;;;
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88 ;;; If You Think You'Re Seeing A Bug:
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89 ;;; =================================
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90 ;;; When reporting problems, send the following information:
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91 ;;;
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92 ;;; - Exactly what behavior you're seeing;
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93 ;;; - The output of the `xlsfonts' program;
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94 ;;; - The value of the variable `device-fonts-cache';
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95 ;;; - The values of the following expressions, both before and after
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96 ;;; making a selection from any of the fonts-related menus:
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97 ;;; (face-font 'default)
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98 ;;; (font-truename (face-font 'default))
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99 ;;; (font-properties (face-font 'default))
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100 ;;; - The values of the following variables after making a selection:
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101 ;;; font-menu-preferred-resolution
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102 ;;; font-menu-registry-encoding
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103 ;;;
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104 ;;; There is a common misconception that "*-courier-medium-r-*-11-*", also
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105 ;;; known as "-adobe-courier-medium-r-normal--11-80-100-100-m-60-iso8859-1",
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106 ;;; is an 11-point font. It is not -- it is an 11-pixel font at 100dpi,
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107 ;;; which is an 8-point font (the number after -11- is the size in tenths
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108 ;;; of points). So if you expect to be seeing an "11" entry in the "Size"
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109 ;;; menu and are not, this may be why.
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110 ;;;
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111 ;;; In the real world (aka Solaris), one has to deal with fonts that
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112 ;;; appear to be medium-i but are really light-r, and fonts that
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113 ;;; resolve to different resolutions depending on the charset:
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114 ;;;
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115 ;;; (font-instance-truename
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116 ;;; (make-font-instance "-*-mincho-medium-i-normal-*-*-*-*-*-*-*-jisx0201*-*"))
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117 ;;; ==>
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118 ;;; "-morisawa-ryumin light kl-light-r-normal--10-100-72-72-m-50-jisx0201.1976-0"
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119 ;;;
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120 ;;; (list-fonts "-dt-interface user-medium-r-normal-s*-*-*-*-*-*-*-*-*")
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121 ;;; ==>
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122 ;;; ("-dt-interface user-medium-r-normal-s sans-12-120-72-72-m-70-iso8859-1"
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123 ;;; "-dt-interface user-medium-r-normal-s-14-120-75-75-m-120-jisx0208.1983-0"
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124 ;;; "-dt-interface user-medium-r-normal-s-14-120-75-75-m-60-jisx0201.1976-0")
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125
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126 ;;;###autoload
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127 (defcustom font-menu-ignore-scaled-fonts nil
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128 "*If non-nil, then the font menu will try to show only bitmap fonts."
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129 :type 'boolean
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130 :group 'font-menu)
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131
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132 ;;;###autoload
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133 (defcustom font-menu-this-frame-only-p nil
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134 "*If non-nil, then changing the default font from the font menu will only
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135 affect one frame instead of all frames."
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136 :type 'boolean
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137 :group 'font-menu)
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138
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139 (defcustom font-menu-max-items 25
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140 "*Maximum number of items in the font menu
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141 If number of entries in a menu is larger than this value, split menu
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142 into submenus of nearly equal length. If nil, never split menu into
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143 submenus."
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144 :group 'font-menu
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145 :type '(choice (const :tag "no submenus" nil)
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146 (integer)))
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147
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148 (defcustom font-menu-submenu-name-format "%-12.12s ... %.12s"
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149 "*Format specification of the submenu name.
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150 Used by `font-menu-split-long-menu' if the number of entries in a menu is
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151 larger than `font-menu-menu-max-items'.
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152 This string should contain one %s for the name of the first entry and
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153 one %s for the name of the last entry in the submenu.
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154 If the value is a function, it should return the submenu name. The
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155 function is be called with two arguments, the names of the first and
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156 the last entry in the menu."
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157 :group 'font-menu
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158 :type '(choice (string :tag "Format string")
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159 (function)))
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160
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161 (defvar font-menu-preferred-resolution
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162 (make-specifier-and-init 'generic '((global ((mswindows) . ":")
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163 ((x) . "*-*"))) t)
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164 "Preferred horizontal and vertical font menu resolution (e.g. \"75:75\").")
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165
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166 (defvar font-menu-size-scaling
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167 (make-specifier-and-init 'integer '((global ((mswindows) . 1)
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168 ((x) . 10))) t)
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169 "Scale factor used in defining font sizes.")
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170
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171 (defun vassoc (key valist)
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172 "Search VALIST for a vector whose first element is equal to KEY.
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173 See also `assoc'."
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174 ;; by Stig@hackvan.com
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175 (let (el)
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176 (catch 'done
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177 (while (setq el (pop valist))
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178 (and (equal key (aref el 0))
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179 (throw 'done el))))))
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180
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181 ;; only call XListFonts (and parse) once per device.
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182 ;; ( (device . [parsed-list-fonts family-menu size-menu weight-menu]) ...)
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183 (defvar device-fonts-cache nil)
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184
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185 (defsubst device-fonts-cache ()
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186 (or (cdr (assq (selected-device) device-fonts-cache))
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187 (and (reset-device-font-menus (selected-device))
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188 (cdr (assq (selected-device) device-fonts-cache)))))
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189
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190 ;;;###autoload
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191 (fset 'install-font-menus 'reset-device-font-menus)
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192 (make-obsolete 'install-font-menus 'reset-device-font-menus)
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193
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194 ;;;###autoload
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195 (defun reset-device-font-menus (&optional device debug)
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196 "Generates the `Font', `Size', and `Weight' submenus for the Options menu.
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197 This is run the first time that a font-menu is needed for each device.
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198 If you don't like the lazy invocation of this function, you can add it to
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199 `create-device-hook' and that will make the font menus respond more quickly
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200 when they are selected for the first time. If you add fonts to your system,
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201 or if you change your font path, you can call this to re-initialize the menus."
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202 (message "Getting list of fonts from server... ")
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203 (if (or noninteractive
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204 (not (or device (setq device (selected-device)))))
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205 nil
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206 (call-device-method 'reset-device-font-menus device device debug)
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207 (message "Getting list of fonts from server... done.")))
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208
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209 (defun font-menu-split-long-menu (menu)
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210 "Split MENU according to `font-menu-max-items'."
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211 (let ((len (length menu)))
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212 (if (or (null font-menu-max-items)
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213 (null (featurep 'lisp-float-type))
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214 (<= len font-menu-max-items))
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215 menu
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216 ;; Submenu is max 2 entries longer than menu, never shorter, number of
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217 ;; entries in submenus differ by at most one (with longer submenus first)
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218 (let* ((outer (floor (sqrt len)))
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219 (inner (/ len outer))
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220 (rest (% len outer))
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221 (result nil))
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222 (setq menu (reverse menu))
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223 (while menu
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224 (let ((in inner)
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225 (sub nil)
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226 (to (car menu)))
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227 (while (> in 0)
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228 (setq in (1- in)
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229 sub (cons (car menu) sub)
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230 menu (cdr menu)))
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231 (setq result
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232 (cons (cons (if (stringp font-menu-submenu-name-format)
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233 (format font-menu-submenu-name-format
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234 (aref (car sub) 0) (aref to 0))
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235 (funcall font-menu-submenu-name-format
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236 (aref (car sub) 0) (aref to 0)))
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237 sub)
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238 result)
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239 rest (1+ rest))
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240 (if (= rest outer) (setq inner (1+ inner)))))
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241 result))))
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242
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243 ;;;###autoload
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244 (defun font-menu-family-constructor (ignored)
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245 (catch 'menu
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246 (unless (console-on-window-system-p)
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247 (throw 'menu '(["Cannot parse current font" ding nil])))
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248 (let* ((dcache (device-fonts-cache))
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249 (font-data (font-menu-font-data 'default dcache))
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250 (entry (aref font-data 0))
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251 (family (aref font-data 1))
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252 (size (aref font-data 2))
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253 (weight (aref font-data 3))
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254 f)
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255 (unless family
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256 (throw 'menu '(["Cannot parse current font" ding nil])))
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257 ;; Items on the Font menu are enabled iff that font exists in
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258 ;; the same size and weight as the current font (scalable fonts
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259 ;; exist in every size). Only the current font is marked as
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260 ;; selected.
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261 (font-menu-split-long-menu
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262 (mapcar
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263 (lambda (item)
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264 (setq f (aref item 0)
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265 entry (vassoc f (aref dcache 0)))
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266 (if (and (or (member weight (aref entry 1))
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267 ;; mswindows often allows any weight
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268 (member "" (aref entry 1)))
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269 (or (member size (aref entry 2))
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270 (and (not font-menu-ignore-scaled-fonts)
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271 (member 0 (aref entry 2)))))
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272 (enable-menu-item item)
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273 (disable-menu-item item))
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274 (if (string-equal family f)
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275 (select-toggle-menu-item item)
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276 (deselect-toggle-menu-item item))
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277 item)
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278 (aref dcache 1))))))
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279
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280 (define-device-method* font-menu-font-data)
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281
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282 ;;;###autoload
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283 (defun font-menu-size-constructor (ignored)
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284 (catch 'menu
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285 (unless (console-on-window-system-p)
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286 (throw 'menu '(["Cannot parse current font" ding nil])))
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287 (let* ((dcache (device-fonts-cache))
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288 (font-data (font-menu-font-data 'default dcache))
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289 (entry (aref font-data 0))
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290 (family (aref font-data 1))
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291 (size (aref font-data 2))
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292 ;;(weight (aref font-data 3))
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293 s)
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294 (unless family
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295 (throw 'menu '(["Cannot parse current font" ding nil])))
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296 ;; Items on the Size menu are enabled iff current font has
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297 ;; that size. Only the size of the current font is selected.
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298 ;; (If the current font comes in size 0, it is scalable, and
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299 ;; thus has every size.)
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300 (mapcar
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301 (lambda (item)
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302 (setq s (nth 3 (aref item 1)))
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303 (if (or (member s (aref entry 2))
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304 (and (not font-menu-ignore-scaled-fonts)
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305 (member 0 (aref entry 2))))
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306 (enable-menu-item item)
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307 (disable-menu-item item))
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308 (if (eq size s)
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309 (select-toggle-menu-item item)
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310 (deselect-toggle-menu-item item))
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311 item)
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312 (aref dcache 2)))))
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313
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314 ;;;###autoload
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315 (defun font-menu-weight-constructor (ignored)
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316 (catch 'menu
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317 (unless (console-on-window-system-p)
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318 (throw 'menu '(["Cannot parse current font" ding nil])))
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319 (let* ((dcache (device-fonts-cache))
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320 (font-data (font-menu-font-data 'default dcache))
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321 (entry (aref font-data 0))
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322 (family (aref font-data 1))
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323 ;;(size (aref font-data 2))
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324 (weight (aref font-data 3))
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325 w)
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326 (unless family
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327 (throw 'menu '(["Cannot parse current font" ding nil])))
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328 ;; Items on the Weight menu are enabled iff current font
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329 ;; has that weight. Only the weight of the current font
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330 ;; is selected.
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331 (mapcar
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332 (lambda (item)
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333 (setq w (aref item 0))
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334 (if (member w (aref entry 1))
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335 (enable-menu-item item)
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336 (disable-menu-item item))
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337 (if (string-equal weight w)
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338 (select-toggle-menu-item item)
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339 (deselect-toggle-menu-item item))
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340 item)
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341 (aref dcache 3)))))
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342
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343
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344 ;;; Changing font sizes
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345
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346 (defun font-menu-set-font (family weight size)
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347 ;; This is what gets run when an item is selected from any of the three
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348 ;; fonts menus. It needs to be rather clever.
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349 ;; (size is measured in 10ths of points.)
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350 (let* ((dcache (device-fonts-cache))
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351 (font-data (font-menu-font-data 'default dcache))
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352 (from-family (aref font-data 1))
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353 (from-size (aref font-data 2))
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354 (from-weight (aref font-data 3))
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355 (from-slant (aref font-data 4))
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356 (face-list-to-change (delq 'default (face-list)))
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357 new-default-face-font
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358 new-props)
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359 (unless from-family
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360 (signal 'error '("couldn't parse font name for default face")))
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361 (when weight
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362 (signal 'error '("Setting weight currently not supported")))
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363 (setq new-default-face-font
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364 (font-menu-load-font
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365 (or family from-family)
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366 (or weight from-weight)
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367 (or size from-size)
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368 from-slant
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369 (specifier-instance
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370 font-menu-preferred-resolution (selected-device))))
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371 ;; This is such a gross hack. The border-glyph face under
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372 ;; mswindows is in a symbol font. Thus it will not appear in the
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373 ;; cache - being a junk family. What we should do is change the
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374 ;; size but not the family, but this is more work than I care to
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375 ;; invest at the moment.
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376 (when (eq (device-type) 'mswindows)
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377 (setq face-list-to-change
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378 (delq 'border-glyph face-list-to-change)))
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379 (dolist (face face-list-to-change)
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380 (when (face-font-instance face)
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381 (message "Changing font of `%s'..." face)
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382 (condition-case c
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383 (font-menu-change-face face
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384 from-family from-weight from-size
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385 family weight size)
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386 (error
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387 (display-error c nil)
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388 (sit-for 1)))))
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389 ;; Set the default face's font after hacking the other faces, so that
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390 ;; the frame size doesn't change until we are all done.
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391
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392 ;; If we need to be frame local we do the changes ourselves.
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393 (if font-menu-this-frame-only-p
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394 ;;; WMP - we need to honor font-menu-this-frame-only-p here!
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395 (set-face-font 'default new-default-face-font
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396 (and font-menu-this-frame-only-p (selected-frame)))
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397 ;; OK Let Customize do it.
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416
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398 (custom-set-face-update-spec 'default
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399 (list (list 'type (device-type)))
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400 (list :family family
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401 :size (concat
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402 (int-to-string
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418
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403 (/ (or size from-size)
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416
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404 (specifier-instance font-menu-size-scaling
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405 (selected-device))))
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406 "pt")))
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414
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407 (message "Font %s" (face-font-name 'default)))))
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408
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409
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410 (defun font-menu-change-face (face
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411 from-family from-weight from-size
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412 to-family to-weight to-size)
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413 (or (symbolp face) (signal 'wrong-type-argument (list 'symbolp face)))
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414 (let* ((dcache (device-fonts-cache))
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415 (font-data (font-menu-font-data face dcache))
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416 (face-family (aref font-data 1))
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417 (face-size (aref font-data 2))
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418 (face-weight (aref font-data 3))
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419 (face-slant (aref font-data 4)))
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420
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421 (or face-family
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422 (signal 'error (list "couldn't parse font name for face" face)))
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423
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424 ;; If this face matches the old default face in the attribute we
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425 ;; are changing, then change it to the new attribute along that
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426 ;; dimension. Also, the face must have its own global attribute.
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427 ;; If its value is inherited, we don't touch it. If any of this
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428 ;; is not true, we leave it alone.
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429 (when (and (face-font face 'global)
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430 (cond
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431 (to-family (string-equal face-family from-family))
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432 (to-weight (string-equal face-weight from-weight))
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433 (to-size (= face-size from-size))))
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434 (set-face-font face
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435 (font-menu-load-font (or to-family face-family)
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436 (or to-weight face-weight)
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437 (or to-size face-size)
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438 face-slant
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439 (specifier-instance
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440 font-menu-preferred-resolution
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441 (selected-device)))
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442 (and font-menu-this-frame-only-p
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443 (selected-frame))))))
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444
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445 (define-device-method font-menu-load-font)
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446
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447 (defun flush-device-fonts-cache (device)
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448 ;; by Stig@hackvan.com
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449 (let ((elt (assq device device-fonts-cache)))
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450 (and elt
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451 (setq device-fonts-cache (delq elt device-fonts-cache)))))
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452
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453 (add-hook 'delete-device-hook 'flush-device-fonts-cache)
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454
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455 (provide 'font-menu)
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456
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457 ;; font-menu ends here
|
