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#------------------------------------------------------------------------------
# Copyright (c) 2005-2007 by 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!
#
#------------------------------------------------------------------------------
""" Trait definition for a wxPython-based Kiva font.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from enthought.etsconfig.api \
import ETSConfig
if ETSConfig.toolkit == 'wx':
from enthought.kiva.traits.ui.wx.kiva_font_editor import KivaFontEditor
elif ETSConfig.toolkit == 'qt4':
# FIXME
#from enthought.kiva.traits.ui.qt4.kiva_font_editor \
# import KivaFontEditor
KivaFontEditor = None
else:
KivaFontEditor = None
from enthought.traits.api \
import Trait, TraitError, TraitHandler, TraitFactory
#-------------------------------------------------------------------------------
# Convert a string into a valid 'Font' object (if possible):
#-------------------------------------------------------------------------------
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
font_families = font_styles = font_weights = DEFAULT = NORMAL = None
def init_constants ( ):
""" Dynamically load Kiva constants to avoid import dependencies.
"""
global font_families, font_styles, font_weights, default_face, DEFAULT, NORMAL
if font_families is not None:
return
import enthought.kiva.constants as kc
DEFAULT = kc.DEFAULT
NORMAL = kc.NORMAL
# Mapping of strings to valid Kiva font families:
font_families = {
'default': kc.DEFAULT,
'decorative': kc.DECORATIVE,
'roman': kc.ROMAN,
'script': kc.SCRIPT,
'swiss': kc.SWISS,
'modern': kc.MODERN
}
# Mapping of strings to Kiva font styles:
font_styles = {
'italic': kc.ITALIC
}
# Mapping of strings to Kiva font weights:
font_weights = {
'bold': kc.BOLD
}
default_face = {
kc.SWISS: "Arial",
kc.ROMAN: "Times",
kc.MODERN: "Courier",
kc.SCRIPT: "Zapfino",
kc.DECORATIVE: "Zapfino", # need better choice for this
}
# Strings to ignore in text representations of fonts
font_noise = [ 'pt', 'point', 'family' ]
#-------------------------------------------------------------------------------
# 'TraitKivaFont' class'
#-------------------------------------------------------------------------------
class TraitKivaFont ( TraitHandler ):
""" Ensures that values assigned to a trait attribute are valid font
descriptor strings for Kiva fonts; the value actually assigned is the
corresponding Kiva font.
"""
#---------------------------------------------------------------------------
# Validates that the value is a valid font:
#---------------------------------------------------------------------------
def validate ( self, object, name, value ):
""" Validates that the value is a valid font.
"""
from enthought.kiva.fonttools import Font
if isinstance( value, Font ):
return value
# Make sure all Kiva related data is loaded:
init_constants()
try:
point_size = 10
family = DEFAULT
style = NORMAL
weight = 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:
try:
point_size = int( lword )
except:
facename.append( word )
if facename == "":
facename = default_face.get(family, "")
return Font(face_name = " ".join(facename),
size = point_size,
family = family,
weight = weight,
style = style,
underline = underline)
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')" )
fh = TraitKivaFont()
if KivaFontEditor is not None:
KivaFontTrait = Trait(fh.validate(None, None, 'modern 12'), fh,
editor = KivaFontEditor)
else:
KivaFontTrait = Trait(fh.validate(None, None, 'modern 12'), fh)
def KivaFontFunc ( *args, **metadata ):
""" Returns a trait whose value must be a GUI toolkit-specific font.
Description
-----------
For wxPython, the returned trait accepts any of the following:
* an enthought.kiva.fonttools.Font instance
* a string describing the font, including one or more of the font family,
size, weight, style, and typeface name.
Default Value
-------------
For wxPython, 'Arial 10'
"""
return KivaFontTrait( *args, **metadata )
KivaFont = TraitFactory( KivaFontFunc )
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