/usr/lib/python3.6/tkinter/font.py is in python3-tk 3.6.5-3.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 | # Tkinter font wrapper
#
# written by Fredrik Lundh, February 1998
#
__version__ = "0.9"
import itertools
import tkinter
# weight/slant
NORMAL = "normal"
ROMAN = "roman"
BOLD = "bold"
ITALIC = "italic"
def nametofont(name):
"""Given the name of a tk named font, returns a Font representation.
"""
return Font(name=name, exists=True)
class Font:
"""Represents a named font.
Constructor options are:
font -- font specifier (name, system font, or (family, size, style)-tuple)
name -- name to use for this font configuration (defaults to a unique name)
exists -- does a named font by this name already exist?
Creates a new named font if False, points to the existing font if True.
Raises _tkinter.TclError if the assertion is false.
the following are ignored if font is specified:
family -- font 'family', e.g. Courier, Times, Helvetica
size -- font size in points
weight -- font thickness: NORMAL, BOLD
slant -- font slant: ROMAN, ITALIC
underline -- font underlining: false (0), true (1)
overstrike -- font strikeout: false (0), true (1)
"""
counter = itertools.count(1)
def _set(self, kw):
options = []
for k, v in kw.items():
options.append("-"+k)
options.append(str(v))
return tuple(options)
def _get(self, args):
options = []
for k in args:
options.append("-"+k)
return tuple(options)
def _mkdict(self, args):
options = {}
for i in range(0, len(args), 2):
options[args[i][1:]] = args[i+1]
return options
def __init__(self, root=None, font=None, name=None, exists=False,
**options):
if not root:
root = tkinter._default_root
tk = getattr(root, 'tk', root)
if font:
# get actual settings corresponding to the given font
font = tk.splitlist(tk.call("font", "actual", font))
else:
font = self._set(options)
if not name:
name = "font" + str(next(self.counter))
self.name = name
if exists:
self.delete_font = False
# confirm font exists
if self.name not in tk.splitlist(tk.call("font", "names")):
raise tkinter._tkinter.TclError(
"named font %s does not already exist" % (self.name,))
# if font config info supplied, apply it
if font:
tk.call("font", "configure", self.name, *font)
else:
# create new font (raises TclError if the font exists)
tk.call("font", "create", self.name, *font)
self.delete_font = True
self._tk = tk
self._split = tk.splitlist
self._call = tk.call
def __str__(self):
return self.name
def __eq__(self, other):
return isinstance(other, Font) and self.name == other.name
def __getitem__(self, key):
return self.cget(key)
def __setitem__(self, key, value):
self.configure(**{key: value})
def __del__(self):
try:
if self.delete_font:
self._call("font", "delete", self.name)
except Exception:
pass
def copy(self):
"Return a distinct copy of the current font"
return Font(self._tk, **self.actual())
def actual(self, option=None, displayof=None):
"Return actual font attributes"
args = ()
if displayof:
args = ('-displayof', displayof)
if option:
args = args + ('-' + option, )
return self._call("font", "actual", self.name, *args)
else:
return self._mkdict(
self._split(self._call("font", "actual", self.name, *args)))
def cget(self, option):
"Get font attribute"
return self._call("font", "config", self.name, "-"+option)
def config(self, **options):
"Modify font attributes"
if options:
self._call("font", "config", self.name,
*self._set(options))
else:
return self._mkdict(
self._split(self._call("font", "config", self.name)))
configure = config
def measure(self, text, displayof=None):
"Return text width"
args = (text,)
if displayof:
args = ('-displayof', displayof, text)
return self._tk.getint(self._call("font", "measure", self.name, *args))
def metrics(self, *options, **kw):
"""Return font metrics.
For best performance, create a dummy widget
using this font before calling this method."""
args = ()
displayof = kw.pop('displayof', None)
if displayof:
args = ('-displayof', displayof)
if options:
args = args + self._get(options)
return self._tk.getint(
self._call("font", "metrics", self.name, *args))
else:
res = self._split(self._call("font", "metrics", self.name, *args))
options = {}
for i in range(0, len(res), 2):
options[res[i][1:]] = self._tk.getint(res[i+1])
return options
def families(root=None, displayof=None):
"Get font families (as a tuple)"
if not root:
root = tkinter._default_root
args = ()
if displayof:
args = ('-displayof', displayof)
return root.tk.splitlist(root.tk.call("font", "families", *args))
def names(root=None):
"Get names of defined fonts (as a tuple)"
if not root:
root = tkinter._default_root
return root.tk.splitlist(root.tk.call("font", "names"))
# --------------------------------------------------------------------
# test stuff
if __name__ == "__main__":
root = tkinter.Tk()
# create a font
f = Font(family="times", size=30, weight=NORMAL)
print(f.actual())
print(f.actual("family"))
print(f.actual("weight"))
print(f.config())
print(f.cget("family"))
print(f.cget("weight"))
print(names())
print(f.measure("hello"), f.metrics("linespace"))
print(f.metrics(displayof=root))
f = Font(font=("Courier", 20, "bold"))
print(f.measure("hello"), f.metrics("linespace", displayof=root))
w = tkinter.Label(root, text="Hello, world", font=f)
w.pack()
w = tkinter.Button(root, text="Quit!", command=root.destroy)
w.pack()
fb = Font(font=w["font"]).copy()
fb.config(weight=BOLD)
w.config(font=fb)
tkinter.mainloop()
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