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# Copyright (C) 2008 One Laptop Per Child
#
# 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
import gobject
import math
from sugar.graphics.icon import CanvasIcon
from sugar.graphics.style import Color
from sugar.graphics.xocolor import XoColor
class CanvasPulsingIcon(CanvasIcon):
__gtype_name__ = 'SugarCanvasPulsingIcon'
_INTERVAL = 100
_STEP = math.pi / 10 # must be a fraction of pi, for clean caching
__gproperties__ = {
'base-color' : (object, None, None, gobject.PARAM_READWRITE),
'pulse-color' : (object, None, None, gobject.PARAM_READWRITE),
'pulsing' : (bool, None, None, False, gobject.PARAM_READWRITE),
'paused' : (bool, None, None, False, gobject.PARAM_READWRITE)
}
def __init__(self, **kwargs):
self._base_color = None
self._pulse_color = None
self._pulse_hid = None
self._paused = False
self._pulsing = False
self._level = 0
self._phase = 0
CanvasIcon.__init__(self, **kwargs)
def _start_pulsing(self, restart=False):
if restart:
self._phase = 0
self._pulse_hid = gobject.timeout_add(self._INTERVAL, self.__pulse_cb)
def _stop_pulsing(self):
if self._pulse_hid is not None:
gobject.source_remove(self._pulse_hid)
self._pulse_hid = None
self.props.xo_color = self._base_color
def _get_color(self, orig_color, target_color):
next_point = (orig_color[0] + self._level * (target_color[0] - orig_color[0]),
orig_color[1] + self._level * (target_color[1] - orig_color[1]),
orig_color[2] + self._level * (target_color[2] - orig_color[2]))
return Color('#%02x%02x%02x' % (int(next_point[0] * 255),
int(next_point[1] * 255),
int(next_point[2] * 255)))
def __pulse_cb(self):
self._phase += self._STEP
self._level = (math.sin(self._phase) + 1) / 2
self._update_colors()
return True
def _get_as_rgba(self, html_color):
if html_color == 'none':
return Color('#FFFFFF', alpha=1.0).get_rgba()
else:
return Color(html_color).get_rgba()
def _update_colors(self):
if self._pulsing:
base_stroke = self._get_as_rgba(self._base_color.get_stroke_color())
pulse_stroke = self._get_as_rgba(self._pulse_color.get_stroke_color())
base_fill = self._get_as_rgba(self._base_color.get_fill_color())
pulse_fill = self._get_as_rgba(self._pulse_color.get_fill_color())
self.props.stroke_color = \
self._get_color(base_stroke, pulse_stroke).get_svg()
self.props.fill_color = \
self._get_color(base_fill, pulse_fill).get_svg()
else:
self.props.xo_color = self._base_color
def do_set_property(self, pspec, value):
if pspec.name == 'base-color':
if self._base_color != value:
self._base_color = value
self._update_colors()
elif pspec.name == 'pulse-color':
if self._pulse_color != value:
self._pulse_color = value
self._update_colors()
elif pspec.name == 'pulsing':
if self._pulsing != value:
self._pulsing = value
if self._pulsing:
self._start_pulsing(restart=True)
else:
self._stop_pulsing()
elif pspec.name == 'paused':
if self._paused != value:
self._paused = value
if self._paused:
self._stop_pulsing()
else:
self._start_pulsing(restart=False)
else:
CanvasIcon.do_set_property(self, pspec, value)
def do_get_property(self, pspec):
if pspec.name == 'base-color':
return self._base_color
elif pspec.name == 'pulse-color':
return self._pulse_color
elif pspec.name == 'pulsing':
return self._pulsing
elif pspec.name == 'paused':
return self._paused
else:
return CanvasIcon.do_get_property(self, pspec)
"""
def set_base_color(self, base_color):
self._base_color = base_color
def get_base_color(self):
return self._base_color
base_color = gobject.property(type=object, setter=set_base_color,
getter=get_base_color)
def set_pulse_color(self, pulse_color):
self._pulse_color = pulse_color
def get_pulse_color(self):
return self._pulse_color
pulse_color = gobject.property(type=object, setter=set_pulse_color,
getter=get_pulse_color)
def set_pulsing(self, pulsing):
pass
def get_pulsing(self):
return self._pulse_hid != None
pulsing = gobject.property(type=bool, default=False, setter=set_pulsing,
getter=get_pulsing)
def set_paused(self, paused):
self._paused = paused
def get_paused(self):
return self._paused
paused = gobject.property(type=bool, default=False, setter=set_paused,
getter=get_paused)
"""
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