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#------------------------------------------------------------------------------
#
# Copyright (c) 2005, Enthought, Inc.
# All rights reserved.
#
# This software is provided without warranty under the terms of the BSD
# license included in enthought/LICENSE.txt and may be redistributed only
# under the conditions described in the aforementioned license. The license
# is also available online at http://www.enthought.com/licenses/BSD.txt
#
# Thanks for using Enthought open source!
#
# Author: David C. Morrill
# Date: 12/22/2004
#
#------------------------------------------------------------------------------
""" Trait definition for a wxPython-based font.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
import wx
from traits.api \
import Trait, TraitHandler, TraitError
#-------------------------------------------------------------------------------
# Convert a string into a valid 'wxFont' object (if possible):
#-------------------------------------------------------------------------------
# Mapping of strings to valid wxFont families
font_families = {
'default': wx.DEFAULT,
'decorative': wx.DECORATIVE,
'roman': wx.ROMAN,
'script': wx.SCRIPT,
'swiss': wx.SWISS,
'modern': wx.MODERN
}
# Mapping of strings to wxFont styles
font_styles = {
'slant': wx.SLANT,
'italic': wx.ITALIC
}
# Mapping of strings wxFont weights
font_weights = {
'light': wx.LIGHT,
'bold': wx.BOLD
}
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
#-------------------------------------------------------------------------------
# Converts a wx.Font into a string description of itself:
#-------------------------------------------------------------------------------
def font_to_str ( font ):
""" Converts a wx.Font into a string description of itself.
"""
weight = { wx.LIGHT: ' Light',
wx.BOLD: ' Bold' }.get( font.GetWeight(), '' )
style = { wx.SLANT: ' Slant',
wx.ITALIC: ' Italic' }.get( font.GetStyle(), '' )
underline = ''
if font.GetUnderlined():
underline = ' underline'
return '%s point %s%s%s%s' % (
font.GetPointSize(), font.GetFaceName(), 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, wx.Font ):
value = font_to_str( value )
point_size = None
family = wx.DEFAULT
style = wx.NORMAL
weight = wx.NORMAL
underline = 0
facename = []
for word in value.split():
lword = word.lower()
if font_families.has_key( lword ):
family = font_families[ lword ]
elif font_styles.has_key( lword ):
style = font_styles[ lword ]
elif font_weights.has_key( lword ):
weight = font_weights[ lword ]
elif lword == 'underline':
underline = 1
elif lword not in font_noise:
if point_size is None:
try:
point_size = int( lword )
continue
except:
pass
facename.append( word )
return TraitsFont( point_size or 10, family, style, weight, underline,
' '.join( facename ) )
#-------------------------------------------------------------------------------
# 'TraitsFont' class:
#-------------------------------------------------------------------------------
class TraitsFont ( wx.Font ):
""" A Traits-specific wx.Font.
"""
#---------------------------------------------------------------------------
# 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 )
#-------------------------------------------------------------------------------
# 'TraitWXFont' class'
#-------------------------------------------------------------------------------
class TraitWXFont ( 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')" )
#-------------------------------------------------------------------------------
# Define a wxPython specific font trait:
#-------------------------------------------------------------------------------
### Note: Declare the editor to be a function which returns the FontEditor
# class from traits ui to avoid circular import issues. For backwards
# compatibility with previous Traits versions, the 'editors' folder in Traits
# project declares 'from api import *' in its __init__.py. The 'api' in turn
# can contain classes that have a Font trait which lead to this file getting
# imported. This leads to a circular import when declaring a Font trait.
def get_font_editor(*args, **traits):
from font_editor import ToolkitEditorFactory
return ToolkitEditorFactory(*args, **traits)
fh = TraitWXFont()
WxFont = Trait( wx.SystemSettings_GetFont( wx.SYS_DEFAULT_GUI_FONT ), fh, editor = get_font_editor )
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