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#------------------------------------------------------------------------------
# Copyright (c) 2007, Riverbank Computing Limited
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD license.
# However, when used with the GPL version of PyQt the additional terms described in the PyQt GPL exception also apply
#
# Author: Riverbank Computing Limited
#------------------------------------------------------------------------------
""" Trait definition for a PyQt-based font.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from pyface.qt import QtGui
from traits.api \
import Trait, TraitHandler, TraitError
#-------------------------------------------------------------------------------
# Convert a string into a valid QFont object (if possible):
#-------------------------------------------------------------------------------
# Mapping of strings to valid QFont style hints.
font_families = {
'default': QtGui.QFont.AnyStyle,
'decorative': QtGui.QFont.Decorative,
'roman': QtGui.QFont.Serif,
'script': QtGui.QFont.SansSerif,
'swiss': QtGui.QFont.SansSerif,
'modern': QtGui.QFont.TypeWriter
}
# Mapping of strings to QFont styles.
font_styles = {
'slant': QtGui.QFont.StyleOblique,
'italic': QtGui.QFont.StyleItalic
}
# Mapping of strings to QFont weights.
font_weights = {
'light': QtGui.QFont.Light,
'bold': QtGui.QFont.Bold
}
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
#-------------------------------------------------------------------------------
# Converts a QFont into a string description of itself:
#-------------------------------------------------------------------------------
def font_to_str ( font ):
""" Converts a QFont into a string description of itself.
"""
weight = { QtGui.QFont.Light: ' Light',
QtGui.QFont.Bold: ' Bold' }.get(font.weight(), '')
style = { QtGui.QFont.StyleOblique: ' Slant',
QtGui.QFont.StyleItalic: ' Italic' }.get(font.style(), '')
underline = ''
if font.underline():
underline = ' underline'
return '%s point %s%s%s%s' % (
font.pointSize(), unicode(font.family()), style, weight, underline )
#-------------------------------------------------------------------------------
# Create a TraitFont object from a string description:
#-------------------------------------------------------------------------------
def create_traitsfont(value):
""" Create a TraitFont object from a string description.
"""
if isinstance(value, QtGui.QFont):
return TraitsFont(value)
point_size = None
family = ''
style = QtGui.QFont.StyleNormal
weight = QtGui.QFont.Normal
underline = False
facename = []
for word in value.split():
lword = word.lower()
if font_families.has_key(lword):
f = QtGui.QFont()
f.setStyleHint(font_families[lword])
family = f.defaultFamily()
elif font_styles.has_key(lword):
style = font_styles[lword]
elif font_weights.has_key(lword):
weight = font_weights[lword]
elif lword == 'underline':
underline = True
elif lword not in font_noise:
if point_size is None:
try:
point_size = int(lword)
continue
except:
pass
facename.append(word)
if facename:
family = ' '.join(facename)
if family:
fnt = TraitsFont(family)
else:
fnt = TraitsFont()
fnt.setStyle(style)
fnt.setWeight(weight)
fnt.setUnderline(underline)
if point_size is None:
fnt.setPointSize(QtGui.QApplication.font().pointSize())
else:
fnt.setPointSize(point_size)
return fnt
#-------------------------------------------------------------------------------
# 'TraitsFont' class:
#-------------------------------------------------------------------------------
class TraitsFont(QtGui.QFont):
""" A Traits-specific QFont.
"""
#---------------------------------------------------------------------------
# Returns the pickleable form of a TraitsFont object:
#---------------------------------------------------------------------------
def __reduce_ex__(self, protocol):
""" Returns the pickleable form of a TraitsFont object.
"""
return (create_traitsfont, (font_to_str(self), ))
#---------------------------------------------------------------------------
# Returns a printable form of the font:
#---------------------------------------------------------------------------
def __str__(self):
""" Returns a printable form of the font.
"""
return font_to_str(self)
#-------------------------------------------------------------------------------
# 'TraitPyQtFont' class'
#-------------------------------------------------------------------------------
class TraitPyQtFont ( TraitHandler ):
""" Ensures that values assigned to a trait attribute are valid font
descriptor strings; the value actually assigned is the corresponding
TraitsFont.
"""
#---------------------------------------------------------------------------
# Validates that the value is a valid font:
#---------------------------------------------------------------------------
def validate ( self, object, name, value ):
""" Validates that the value is a valid font descriptor string. If so,
it returns the corresponding TraitsFont; otherwise, it raises a
TraitError.
"""
if value is None:
return None
try:
return create_traitsfont( value )
except:
pass
raise TraitError, ( object, name, 'a font descriptor string',
repr( value ) )
def info ( self ):
return ( "a string describing a font (e.g. '12 pt bold italic "
"swiss family Arial' or 'default 12')" )
#-------------------------------------------------------------------------------
# Callable that returns an instance of the PyQtToolkitEditorFactory for font
# editors.
#-------------------------------------------------------------------------------
### FIXME: We have declared the 'editor' to be a function instead of the
# traitsui.qt4.font_editor.ToolkitEditorFactory class, since the
# latter is leading to too many circular imports. In the future, try to see if
# there is a better way to do this.
def get_font_editor(*args, **traits):
from traitsui.qt4.font_editor import ToolkitEditorFactory
return ToolkitEditorFactory(*args, **traits)
#-------------------------------------------------------------------------------
# Define a PyQt specific font trait:
#-------------------------------------------------------------------------------
PyQtFont = Trait(TraitsFont(), TraitPyQtFont(), editor = get_font_editor)
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