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Diffstat (limited to 'src/jarabe/view/pulsingicon.py')
| -rw-r--r-- | src/jarabe/view/pulsingicon.py | 237 |
1 files changed, 237 insertions, 0 deletions
diff --git a/src/jarabe/view/pulsingicon.py b/src/jarabe/view/pulsingicon.py new file mode 100644 index 0000000..9a98a80 --- /dev/null +++ b/src/jarabe/view/pulsingicon.py @@ -0,0 +1,237 @@ +# 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 math + +import gobject + +from sugar.graphics.icon import Icon, CanvasIcon +from sugar.graphics import style + +_INTERVAL = 100 +_STEP = math.pi / 10 # must be a fraction of pi, for clean caching +_MINIMAL_ALPHA_VALUE = 0.33 + + +class Pulser(object): + def __init__(self, icon): + self._pulse_hid = None + self._icon = icon + self._phase = 0 + self._start_scale = 1.0 + self._end_scale = 1.0 + self._zoom_steps = 1 + self._current_zoom_step = 1 + self._current_scale_step = 1 + + def set_zooming(self, start_scale, end_scale, zoom_steps): + """ Set start and end scale and number of steps in zoom animation """ + self._start_scale = start_scale + self._end_scale = end_scale + self._zoom_steps = zoom_steps + self._current_scale_step = abs(self._start_scale - self._end_scale) / \ + self._zoom_steps + self._icon.scale = self._start_scale + + def start(self, restart=False): + if restart: + self._phase = 0 + if self._pulse_hid is None: + self._pulse_hid = gobject.timeout_add(_INTERVAL, self.__pulse_cb) + if self._start_scale != self._end_scale: + self._icon.scale = self._start_scale + \ + self._current_scale_step * self._current_zoom_step + + def stop(self): + if self._pulse_hid is not None: + gobject.source_remove(self._pulse_hid) + self._pulse_hid = None + self._icon.xo_color = self._icon.get_base_color() + self._phase = 0 + self._icon.alpha = 1.0 + + def update(self): + self._icon.xo_color = self._icon.base_color + self._icon.alpha = _MINIMAL_ALPHA_VALUE + \ + (1 - _MINIMAL_ALPHA_VALUE) * (math.cos(self._phase) + 1) / 2 + + def __pulse_cb(self): + self._phase += _STEP + if self._current_zoom_step <= self._zoom_steps and \ + self._start_scale != self._end_scale: + self._icon.scale = self._start_scale + \ + self._current_scale_step * self._current_zoom_step + self._current_zoom_step += 1 + self.update() + return True + + +class PulsingIcon(Icon): + __gtype_name__ = 'SugarPulsingIcon' + + def __init__(self, **kwargs): + self._pulser = Pulser(self) + self._base_color = None + self._pulse_color = None + self._paused = False + self._pulsing = False + + Icon.__init__(self, **kwargs) + + self._palette = None + self.connect('destroy', self.__destroy_cb) + + def set_pulse_color(self, pulse_color): + self._pulse_color = pulse_color + self._pulser.update() + + def get_pulse_color(self): + return self._pulse_color + + pulse_color = gobject.property( + type=object, getter=get_pulse_color, setter=set_pulse_color) + + def set_base_color(self, base_color): + self._base_color = base_color + self._pulser.update() + + def get_base_color(self): + return self._base_color + + def set_zooming(self, start_size=style.SMALL_ICON_SIZE, + end_size=style.XLARGE_ICON_SIZE, + zoom_steps=10): + if start_size > end_size: + start_scale = 1.0 + end_scale = float(end_size) / start_size + else: + start_scale = float(start_size) / end_size + end_scale = 1.0 + self._pulser.set_zooming(start_scale, end_scale, zoom_steps) + + base_color = gobject.property( + type=object, getter=get_base_color, setter=set_base_color) + + def set_paused(self, paused): + self._paused = paused + + if self._paused: + self._pulser.stop() + else: + self._pulser.start(restart=False) + + def get_paused(self): + return self._paused + + paused = gobject.property( + type=bool, default=False, getter=get_paused, setter=set_paused) + + def set_pulsing(self, pulsing): + self._pulsing = pulsing + + if self._pulsing: + self._pulser.start(restart=True) + else: + self._pulser.stop() + + def get_pulsing(self): + return self._pulsing + + pulsing = gobject.property( + type=bool, default=False, getter=get_pulsing, setter=set_pulsing) + + def _get_palette(self): + return self._palette + + def _set_palette(self, palette): + if self._palette is not None: + self._palette.props.invoker = None + self._palette = palette + + palette = property(_get_palette, _set_palette) + + def __destroy_cb(self, icon): + self._pulser.stop() + if self._palette is not None: + self._palette.destroy() + + +class CanvasPulsingIcon(CanvasIcon): + __gtype_name__ = 'SugarCanvasPulsingIcon' + + def __init__(self, **kwargs): + self._pulser = Pulser(self) + self._base_color = None + self._pulse_color = None + self._paused = False + self._pulsing = False + + CanvasIcon.__init__(self, **kwargs) + + self.connect('destroy', self.__destroy_cb) + + def __destroy_cb(self, box): + self._pulser.stop() + + def set_pulse_color(self, pulse_color): + self._pulse_color = pulse_color + self._pulser.update() + + def get_pulse_color(self): + return self._pulse_color + + pulse_color = gobject.property( + type=object, getter=get_pulse_color, setter=set_pulse_color) + + def set_base_color(self, base_color): + self._base_color = base_color + self._pulser.update() + + def get_base_color(self): + return self._base_color + + base_color = gobject.property( + type=object, getter=get_base_color, setter=set_base_color) + + def set_paused(self, paused): + self._paused = paused + + if self._paused: + self._pulser.stop() + elif self._pulsing: + self._pulser.start(restart=False) + + def get_paused(self): + return self._paused + + paused = gobject.property( + type=bool, default=False, getter=get_paused, setter=set_paused) + + def set_pulsing(self, pulsing): + self._pulsing = pulsing + if self._paused: + return + + if self._pulsing: + self._pulser.start(restart=True) + else: + self._pulser.stop() + + def get_pulsing(self): + return self._pulsing + + pulsing = gobject.property( + type=bool, default=False, getter=get_pulsing, setter=set_pulsing) |