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# 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 os
import gtk
from sugar.graphics import style
class TempoSlider(gtk.HBox):
def __init__(self, min_value, max_value):
gtk.HBox.__init__(self)
self._pixbuf = [None] * 8
self._image = gtk.Image()
self._image.show()
# used to store tempo updates while the slider is active
self._delayed = 0
self._active = False
self.adjustment = gtk.Adjustment(min_value, min_value, max_value,
(max_value - min_value) / 8, (max_value - min_value) / 8, 0)
self._adjustment_h = self.adjustment.connect('value-changed',
self._changed_cb)
slider = gtk.HScale(adjustment = self.adjustment)
slider.show()
slider.set_draw_value(False)
slider.connect("button-press-event", self._press_cb)
slider.connect("button-release-event", self._release_cb)
self.pack_start(slider, True, True)
self.pack_end(self._image, False, False)
def set_value(self, tempo, quiet = False):
if self._active:
self._delayed = tempo
elif quiet:
self.adjustment.handler_block(self._adjustment_h)
self.adjustment.set_value(tempo)
self._update(tempo)
self.adjustment.handler_unblock(self._adjustment_h)
else:
self.adjustment.set_value(tempo)
def _changed_cb(self, widget):
self._update(widget.get_value())
def _update(self, tempo):
def map_range(value, ilower, iupper, olower, oupper):
if value == iupper:
return oupper
return olower + int((oupper-olower+1) * (value-ilower) /
float(iupper-ilower))
img = map_range(tempo, self.adjustment.lower,
self.adjustment.upper, 0, 7)
if not self._pixbuf[img]:
self._pixbuf[img] = gtk.gdk.pixbuf_new_from_file_at_size(
os.path.join(os.path.dirname(__file__), 'images',
'tempo' + str(img+1) + '.svg'),
style.STANDARD_ICON_SIZE, style.STANDARD_ICON_SIZE)
self._image.set_from_pixbuf(self._pixbuf[img])
def _press_cb(self, widget, event):
self._active = True
def _release_cb(self, widget, event):
self._active = False
if self._delayed != 0:
self.set_value(self._delayed, True)
self._delayed = 0
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