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Patch #764217: Add nametofont function, exists parameter.

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Martin v. Löwis 2004-08-18 11:06:45 +00:00
parent 1a7892924f
commit fe84d17a6a
2 changed files with 43 additions and 6 deletions
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44
Lib/lib-tk/tkFont.py
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@ -25,6 +25,11 @@ 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.
@ -32,8 +37,12 @@ class 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.
or any combination of
the following are ignored if font is specified:
family -- font 'family', e.g. Courier, Times, Helvetica
size -- font size in points
@ -41,7 +50,7 @@ class Font:
slant -- font slant: ROMAN, ITALIC
underline -- font underlining: false (0), true (1)
overstrike -- font strikeout: false (0), true (1)
name -- name to use for this font configuration (defaults to a unique name)
"""
def _set(self, kw):
@ -63,7 +72,7 @@ class Font:
options[args[i][1:]] = args[i+1]
return options
def __init__(self, root=None, font=None, name=None, **options):
def __init__(self, root=None, font=None, name=None, exists=False, **options):
if not root:
root = Tkinter._default_root
if font:
@ -74,7 +83,20 @@ class Font:
if not name:
name = "font" + str(id(self))
self.name = name
root.tk.call("font", "create", name, *font)
if exists:
self.delete_font = False
# confirm font exists
if self.name not in root.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:
print "font=%r" % font
root.tk.call("font", "configure", self.name, *font)
else:
# create new font (raises TclError if the font exists)
root.tk.call("font", "create", self.name, *font)
self.delete_font = True
# backlinks!
self._root = root
self._split = root.tk.splitlist
@ -83,12 +105,22 @@ class Font:
def __str__(self):
return self.name
def __eq__(self, other):
return self.name == other.name and isinstance(other, Font)
def __getitem__(self, key):
return self.cget(key)
def __setitem__(self, key, value):
self.configure(**{key: value})
def __del__(self):
try:
self._call("font", "delete", self.name)
if self.delete_font:
self._call("font", "delete", self.name)
except (AttributeError, Tkinter.TclError):
pass
def copy(self):
"Return a distinct copy of the current font"
return Font(self._root, **self.actual())