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annotate Lib/tkinter/font.py @ 79691:05c8928362ee

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Merge __next__ method link fixes with 3.3.
author Ezio Melotti <ezio.melotti@gmail.com>
date Fri, 12 Oct 2012 13:46:37 +0300
parents 774c2afa6665
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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6a018d8c59c9 r903@spiff: Fredrik | 2005-11-12 16:28:37 +0100
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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()