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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 color.
"""
#-------------------------------------------------------------------------------
# Imports:
#-------------------------------------------------------------------------------
from pyface.qt import QtGui
from traits.api \
import Trait, TraitError
#-------------------------------------------------------------------------------
# Convert a number into a QColor object:
#-------------------------------------------------------------------------------
def convert_to_color ( object, name, value ):
""" Converts a number into a QColor object.
"""
# Try the toolkit agnostic format.
try:
tup = eval(value)
except:
tup = value
if isinstance(tup, tuple):
if 3 <= len(tup) <= 4:
try:
color = QtGui.QColor(*tup)
except TypeError:
raise TraitError
else:
raise TraitError
else:
if isinstance(value, basestring):
# Allow for spaces in the string value.
value = value.replace(' ', '')
# Let the standard ctors handle the value.
try:
color = QtGui.QColor(value)
except TypeError:
raise TraitError
if not color.isValid():
raise TraitError
return color
convert_to_color.info = ('a string of the form (r,g,b) or (r,g,b,a) where r, '
'g, b, and a are integers from 0 to 255, a QColor '
'instance, a Qt.GlobalColor, an integer which in hex '
'is of the form 0xRRGGBB, a string of the form #RGB, '
'#RRGGBB, #RRRGGGBBB or #RRRRGGGGBBBB')
#-------------------------------------------------------------------------------
# Standard colors:
#-------------------------------------------------------------------------------
# Note that this is slightly different from the wx implementation in that the
# names do not include spaces and the full set of SVG color keywords is
# supported.
standard_colors = {}
for name in QtGui.QColor.colorNames():
standard_colors[str(name)] = QtGui.QColor(name)
#-------------------------------------------------------------------------------
# Callable that returns an instance of the PyQtToolkitEditorFactory for color
# editors.
#-------------------------------------------------------------------------------
### FIXME: We have declared the 'editor' to be a function instead of the
# traitsui.qt4.color_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_color_editor(*args, **traits):
from traitsui.qt4.color_editor import ToolkitEditorFactory
return ToolkitEditorFactory(*args, **traits)
#-------------------------------------------------------------------------------
# Define PyQt specific color traits:
#-------------------------------------------------------------------------------
def PyQtColor ( default = 'white', allow_none = False, **metadata ):
""" Defines PyQt-specific color traits.
"""
if allow_none:
return Trait( default, None, standard_colors, convert_to_color,
editor = get_color_editor, **metadata )
return Trait( default, standard_colors, convert_to_color,
editor = get_color_editor, **metadata )
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