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#
# color.py -- Handle colors in a more symbolic way
#
# Copyright (C) 1999-2001 Peter Liljenberg <petli@ctrl-c.liu.se>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
import types
class ColorError(Exception): pass
# Screen mixin class
class Color:
def __screen_client_init__(self):
self.color_map = self.info.default_colormap
self.color_alloced = {}
def get_color(self, color, default = None):
"""Return the pixel value corresponding to COLOR.
COLOR can be a string or tuple of (R, G, B).
If the color can't be found and DEFAULT is provided, try to
return that color instead.
"""
try:
return self.color_alloced[color]
except KeyError:
pass
if type(color) is types.StringType:
col = self.color_map.alloc_named_color(color)
elif type(color) is types.TupleType and len(color) == 3:
col = self.color_map.alloc_color(color[0], color[1], color[2])
else:
raise TypeError("string or 3-tuple expected")
# If color allocation fails and there is a default color, simply
# recurse to try to allocate it
if col is None:
if default:
return self.get_color(default)
else:
raise ColorError(color)
else:
self.color_alloced[color] = col.pixel
return self.color_alloced[color]
def get_color_res(self, res_name, res_class, default = None):
"""Return the pixel value for the color defined in
the X resource RES_NAME/RES_CLASS.
If DEFAULT is provided, that name will be used if no matching
X resource is found. If omitted, ColorError will be raised.
"""
col = self.wm.rdb_get(res_name, res_class, default)
if col is None:
raise ColorError('No color resource defined for %s/%s' % (res_name, res_class))
return self.get_color(col, default)
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