Mercurial > cpython-lru_cache-weakref

annotate Lib/tkinter/font.py @ 87690:66c1c9f32567 default tip

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Add use_weakref option to functools.lru_cache The use_weakref option makes lru_cache create weak references to the function arguments when creating the cache key, which prevents them from staying in the memory forever even after all other references to them are gone. This is a proof of concept for http://bugs.python.org/issue19859
author Radomir Dopieralski <devel@sheep.art.pl>
date Tue, 03 Dec 2013 16:02:48 +0100
parents 774c2afa6665
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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6a018d8c59c9 r903@spiff: Fredrik | 2005-11-12 16:28:37 +0100
Fredrik Lundh <fredrik@pythonware.com>
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1 # Tkinter font wrapper
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2 #
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3 # written by Fredrik Lundh, February 1998
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4 #
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5
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6 __version__ = "0.9"
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7
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8 import itertools
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9 import tkinter
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10
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11
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12 # weight/slant
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13 NORMAL = "normal"
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14 ROMAN = "roman"
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15 BOLD = "bold"
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16 ITALIC = "italic"
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17
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18
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19 def nametofont(name):
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20 """Given the name of a tk named font, returns a Font representation.
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21 """
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22 return Font(name=name, exists=True)
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23
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24
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25 class Font:
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26 """Represents a named font.
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27
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28 Constructor options are:
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29
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30 font -- font specifier (name, system font, or (family, size, style)-tuple)
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31 name -- name to use for this font configuration (defaults to a unique name)
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32 exists -- does a named font by this name already exist?
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33 Creates a new named font if False, points to the existing font if True.
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34 Raises _tkinter.TclError if the assertion is false.
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35
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36 the following are ignored if font is specified:
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37
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38 family -- font 'family', e.g. Courier, Times, Helvetica
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39 size -- font size in points
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40 weight -- font thickness: NORMAL, BOLD
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41 slant -- font slant: ROMAN, ITALIC
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42 underline -- font underlining: false (0), true (1)
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43 overstrike -- font strikeout: false (0), true (1)
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44
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45 """
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46
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47 counter = itertools.count(1)
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48
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49 def _set(self, kw):
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50 options = []
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51 for k, v in kw.items():
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52 options.append("-"+k)
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53 options.append(str(v))
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54 return tuple(options)
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55
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56 def _get(self, args):
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57 options = []
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58 for k in args:
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59 options.append("-"+k)
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60 return tuple(options)
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61
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62 def _mkdict(self, args):
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63 options = {}
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64 for i in range(0, len(args), 2):
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65 options[args[i][1:]] = args[i+1]
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66 return options
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67
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68 def __init__(self, root=None, font=None, name=None, exists=False,
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69 **options):
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70 if not root:
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71 root = tkinter._default_root
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72 if font:
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73 # get actual settings corresponding to the given font
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74 font = root.tk.splitlist(root.tk.call("font", "actual", font))
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75 else:
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76 font = self._set(options)
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77 if not name:
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78 name = "font" + str(next(self.counter))
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79 self.name = name
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80
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81 if exists:
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82 self.delete_font = False
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83 # confirm font exists
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84 if self.name not in root.tk.call("font", "names"):
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85 raise tkinter._tkinter.TclError(
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86 "named font %s does not already exist" % (self.name,))
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87 # if font config info supplied, apply it
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88 if font:
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89 root.tk.call("font", "configure", self.name, *font)
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90 else:
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91 # create new font (raises TclError if the font exists)
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92 root.tk.call("font", "create", self.name, *font)
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93 self.delete_font = True
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94 # backlinks!
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95 self._root = root
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96 self._split = root.tk.splitlist
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97 self._call = root.tk.call
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98
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99 def __str__(self):
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100 return self.name
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101
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102 def __eq__(self, other):
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103 return isinstance(other, Font) and self.name == other.name
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104
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105 def __getitem__(self, key):
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106 return self.cget(key)
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107
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108 def __setitem__(self, key, value):
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109 self.configure(**{key: value})
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110
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111 def __del__(self):
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112 try:
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113 if self.delete_font:
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114 self._call("font", "delete", self.name)
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115 except (KeyboardInterrupt, SystemExit):
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116 raise
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117 except Exception:
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118 pass
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119
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120 def copy(self):
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121 "Return a distinct copy of the current font"
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122 return Font(self._root, **self.actual())
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123
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124 def actual(self, option=None, displayof=None):
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125 "Return actual font attributes"
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126 args = ()
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127 if displayof:
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128 args = ('-displayof', displayof)
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129 if option:
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130 args = args + ('-' + option, )
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131 return self._call("font", "actual", self.name, *args)
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132 else:
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133 return self._mkdict(
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134 self._split(self._call("font", "actual", self.name, *args)))
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135
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136 def cget(self, option):
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137 "Get font attribute"
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138 return self._call("font", "config", self.name, "-"+option)
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139
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140 def config(self, **options):
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141 "Modify font attributes"
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142 if options:
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143 self._call("font", "config", self.name,
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144 *self._set(options))
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145 else:
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146 return self._mkdict(
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147 self._split(self._call("font", "config", self.name)))
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148
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149 configure = config
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150
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151 def measure(self, text, displayof=None):
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152 "Return text width"
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153 args = (text,)
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154 if displayof:
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155 args = ('-displayof', displayof, text)
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156 return int(self._call("font", "measure", self.name, *args))
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157
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158 def metrics(self, *options, **kw):
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159 """Return font metrics.
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160
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161 For best performance, create a dummy widget
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162 using this font before calling this method."""
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163 args = ()
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164 displayof = kw.pop('displayof', None)
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165 if displayof:
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166 args = ('-displayof', displayof)
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167 if options:
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168 args = args + self._get(options)
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169 return int(
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170 self._call("font", "metrics", self.name, *args))
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171 else:
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172 res = self._split(self._call("font", "metrics", self.name, *args))
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173 options = {}
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174 for i in range(0, len(res), 2):
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175 options[res[i][1:]] = int(res[i+1])
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176 return options
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177
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178
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179 def families(root=None, displayof=None):
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180 "Get font families (as a tuple)"
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181 if not root:
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182 root = tkinter._default_root
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183 args = ()
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184 if displayof:
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185 args = ('-displayof', displayof)
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186 return root.tk.splitlist(root.tk.call("font", "families", *args))
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187
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188
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189 def names(root=None):
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190 "Get names of defined fonts (as a tuple)"
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191 if not root:
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192 root = tkinter._default_root
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193 return root.tk.splitlist(root.tk.call("font", "names"))
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194
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195
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196 # --------------------------------------------------------------------
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197 # test stuff
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198
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199 if __name__ == "__main__":
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200
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201 root = tkinter.Tk()
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202
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203 # create a font
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204 f = Font(family="times", size=30, weight=NORMAL)
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205
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206 print(f.actual())
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207 print(f.actual("family"))
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208 print(f.actual("weight"))
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209
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210 print(f.config())
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211 print(f.cget("family"))
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212 print(f.cget("weight"))
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213
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214 print(names())
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215
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216 print(f.measure("hello"), f.metrics("linespace"))
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217
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218 print(f.metrics(displayof=root))
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219
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220 f = Font(font=("Courier", 20, "bold"))
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221 print(f.measure("hello"), f.metrics("linespace", displayof=root))
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222
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223 w = tkinter.Label(root, text="Hello, world", font=f)
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224 w.pack()
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225
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226 w = tkinter.Button(root, text="Quit!", command=root.destroy)
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227 w.pack()
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228
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229 fb = Font(font=w["font"]).copy()
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230 fb.config(weight=BOLD)
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231
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232 w.config(font=fb)
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233
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234 tkinter.mainloop()