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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: 02/14/2005
#------------------------------------------------------------------------------
""" Trait definition for a null-based (i.e., no UI) font.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from enthought.traits.api import Trait, TraitHandler, TraitError
from enthought.traits.ui.api import FontEditor
#-------------------------------------------------------------------------------
# Convert a string into a valid 'wxFont' object (if possible):
#-------------------------------------------------------------------------------
# Mapping of strings to valid wxFont families
font_families = [
'default',
'decorative',
'roman',
'script',
'swiss',
'modern'
]
# Mapping of strings to wxFont styles
font_styles = [
'slant',
'italic'
]
# Mapping of strings wxFont weights
font_weights = [
'light',
'bold'
]
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
#-------------------------------------------------------------------------------
# 'TraitFont' class'
#-------------------------------------------------------------------------------
class TraitFont ( TraitHandler ):
""" Ensures that values assigned to a trait attribute are valid font
descriptor strings; the value actually assigned is the corresponding
canonical font descriptor string.
"""
#---------------------------------------------------------------------------
# Validates that the value is a valid font:
#---------------------------------------------------------------------------
def validate ( self, object, name, value ):
""" Validates that the value is a valid font descriptor string.
"""
try:
point_size = family = style = weight = underline = ''
facename = []
for word in value.split():
lword = word.lower()
if lword in font_families:
family = ' ' + lword
elif lword in font_styles:
style = ' ' + lword
elif lword in font_weights:
weight = ' ' + lword
elif lword == 'underline':
underline = ' ' + lword
elif lword not in font_noise:
try:
int( lword )
point_size = lword + ' pt'
except:
facename.append( word )
return ('%s%s%s%s%s%s' % ( point_size, family, style, weight,
underline, ' '.join( facename ) )).strip()
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 'null' specific font trait:
#-------------------------------------------------------------------------------
fh = TraitFont()
NullFont = Trait( fh.validate( None, None, 'Arial 10' ), fh,
editor = FontEditor )
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