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annotate Lib/lib-tk/tkFont.py @ 27998:e27f58a50737 legacy-trunk

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SF bug #690377: Dud footnote reference in distutils docs
author Raymond Hettinger <python@rcn.com>
date Fri, 21 Feb 2003 02:47:09 +0000
parents eee67a84e5fa
children 90c77b8af1a4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #
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2 # Tkinter
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3 # $Id$
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4 #
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5 # font wrapper
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6 #
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7 # written by Fredrik Lundh <fredrik@pythonware.com>, February 1998
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8 #
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9 # FIXME: should add 'displayof' option where relevant (actual, families,
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10 # measure, and metrics)
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11 #
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12 # Copyright (c) Secret Labs AB 1998.
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13 #
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14 # info@pythonware.com
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15 # http://www.pythonware.com
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16 #
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17
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18 __version__ = "0.9"
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19
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20 import Tkinter
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21
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22 # weight/slant
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23 NORMAL = "normal"
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24 BOLD = "bold"
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25 ITALIC = "italic"
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26
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27 class Font:
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28
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29 """Represents a named font.
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30
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31 Constructor options are:
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32
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33 font -- font specifier (name, system font, or (family, size, style)-tuple)
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34
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35 or any combination of
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36
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37 family -- font 'family', e.g. Courier, Times, Helvetica
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38 size -- font size in points
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39 weight -- font thickness: NORMAL, BOLD
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40 slant -- font slant: NORMAL, ITALIC
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41 underline -- font underlining: false (0), true (1)
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42 overstrike -- font strikeout: false (0), true (1)
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43 name -- name to use for this font configuration (defaults to a unique name)
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44 """
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45
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46 def _set(self, kw):
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47 options = []
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48 for k, v in kw.items():
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49 options.append("-"+k)
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50 options.append(str(v))
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51 return tuple(options)
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52
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53 def _get(self, args):
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54 options = []
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55 for k in args:
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56 options.append("-"+k)
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57 return tuple(options)
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58
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59 def _mkdict(self, args):
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60 options = {}
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61 for i in range(0, len(args), 2):
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62 options[args[i][1:]] = args[i+1]
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63 return options
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64
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65 def __init__(self, root=None, font=None, name=None, **options):
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66 if not root:
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67 root = Tkinter._default_root
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68 if font:
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69 # get actual settings corresponding to the given font
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70 font = root.tk.splitlist(root.tk.call("font", "actual", font))
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71 else:
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72 font = self._set(options)
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73 if not name:
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74 name = "font" + str(id(self))
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75 self.name = name
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76 apply(root.tk.call, ("font", "create", name) + font)
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77 # backlinks!
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78 self._root = root
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79 self._split = root.tk.splitlist
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80 self._call = root.tk.call
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81
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82 def __str__(self):
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83 return self.name
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84
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85 def __del__(self):
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86 try:
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87 self._call("font", "delete", self.name)
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88 except (AttributeError, Tkinter.TclError):
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89 pass
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90
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91 def copy(self):
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92 "Return a distinct copy of the current font"
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93 return apply(Font, (self._root,), self.actual())
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94
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95 def actual(self, option=None):
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96 "Return actual font attributes"
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97 if option:
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98 return self._call("font", "actual", self.name, "-"+option)
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99 else:
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100 return self._mkdict(
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101 self._split(self._call("font", "actual", self.name))
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102 )
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103
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104 def cget(self, option):
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105 "Get font attribute"
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106 return self._call("font", "config", self.name, "-"+option)
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107
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108 def config(self, **options):
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109 "Modify font attributes"
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110 if options:
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111 apply(self._call, ("font", "config", self.name) +
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112 self._set(options))
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113 else:
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114 return self._mkdict(
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115 self._split(self._call("font", "config", self.name))
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116 )
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117
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118 configure = config
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119
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120 def measure(self, text):
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121 "Return text width"
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122 return int(self._call("font", "measure", self.name, text))
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123
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124 def metrics(self, *options):
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125 """Return font metrics.
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126
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127 For best performance, create a dummy widget
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128 using this font before calling this method."""
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129
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130 if options:
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131 return int(
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132 self._call("font", "metrics", self.name, self._get(options))
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133 )
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134 else:
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135 res = self._split(self._call("font", "metrics", self.name))
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136 options = {}
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137 for i in range(0, len(res), 2):
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138 options[res[i][1:]] = int(res[i+1])
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139 return options
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140
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141 def families(root=None):
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142 "Get font families (as a tuple)"
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143 if not root:
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144 root = Tkinter._default_root
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145 return root.tk.splitlist(root.tk.call("font", "families"))
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146
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147 def names(root=None):
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148 "Get names of defined fonts (as a tuple)"
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149 if not root:
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150 root = Tkinter._default_root
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151 return root.tk.splitlist(root.tk.call("font", "names"))
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152
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153 # --------------------------------------------------------------------
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154 # test stuff
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155
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156 if __name__ == "__main__":
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157
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158 root = Tkinter.Tk()
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159
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160 # create a font
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161 f = Font(family="times", size=30, weight=NORMAL)
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162
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163 print f.actual()
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164 print f.actual("family")
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165 print f.actual("weight")
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166
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167 print f.config()
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168 print f.cget("family")
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169 print f.cget("weight")
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170
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171 print names()
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172
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173 print f.measure("hello"), f.metrics("linespace")
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174
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175 print f.metrics()
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176
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177 f = Font(font=("Courier", 20, "bold"))
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178 print f.measure("hello"), f.metrics("linespace")
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179
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180 w = Tkinter.Label(root, text="Hello, world", font=f)
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181 w.pack()
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182
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183 w = Tkinter.Button(root, text="Quit!", command=root.destroy)
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184 w.pack()
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185
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186 fb = Font(font=w["font"]).copy()
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187 fb.config(weight=BOLD)
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847ae40074d4 Make reindent.py happy (convert everything to 4-space indents!).
Fred Drake <fdrake@acm.org>
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188
8960
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189 w.config(font=fb)
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190
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191 Tkinter.mainloop()