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"""
/*
* This file is part of PySide: Python for Qt
*
* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
*
* Contact: PySide team <contact@pyside.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public License
* version 2.1 as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*
*/
"""
from PySide import QtGui, QtCore
class KineticScroll(QtCore.QObject):
MAX_SPEED = 2000
def __init__(self, parent=None):
QtCore.QObject.__init__(self, parent)
self._area = parent
self._animation = None
self._animationSpeed = 0
self._animationITime = QtCore.QTime()
self._animationAccel = 0
self._accelConstant = 0.3
self._value = self._lastValue = -1
self._time = self._lastTime = QtCore.QTime.currentTime()
def mouseUp(self, value):
if self._lastValue < 0 or self._animation != None:
return
t = QtCore.QTime.currentTime()
dv = value - self._lastValue
dt = self._lastTime.msecsTo(t) / 1000.0
if dt == 0:
return
self.kineticStart(dv/dt)
self.mouseCancel()
def mouseDown(self, value):
r = True
if self._animation:
self._animation.stop()
self._animation.deleteLater()
self._animation = None
r = False
self._lastValue = value
self._value = value
self._lastTime = QtCore.QTime.currentTime()
self._time = QtCore.QTime.currentTime()
return r
def mouseMove(self, value):
if self._lastValue < 0:
return
dv = value - self._value
t = QtCore.QTime.currentTime()
self._lastValue = self._value
self._lastTime = self._time
self._value = value
self._time = t
self.emit(QtCore.SIGNAL("signalMoveOffset(int)"), dv)
def mouseCancel(self):
self._value = self._lastValue = -1
def kineticStop(self):
if self._animation:
self._animation.stop()
self._animation.deleteLater()
self._animation = None
def kineticStart(self, speed):
self._animationSpeed = max(min(speed, self.MAX_SPEED), -self.MAX_SPEED)
self._animationITime = QtCore.QTime.currentTime()
self._animationAccel = -self._animationSpeed * self._accelConstant
self._animation = QtCore.QTimer(self)
self.connect(self._animation, QtCore.SIGNAL("timeout()"), self.animator)
self._animation.start(30)
def animator(self):
now = QtCore.QTime.currentTime()
dt = self._animationITime.msecsTo(now) / 1000.0
speed = self._animationSpeed + self._animationAccel * dt
value = self._animationSpeed * dt + self._animationAccel * dt * dt / 2
if self._animationAccel * speed > 0:
self.emit(QtCore.SIGNAL("signalMoveOffset(int)"), 0)
#self._area.kineticMove(0)
self.kineticStop()
else:
self.emit(QtCore.SIGNAL("signalMoveOffset(int)"), round(value))
#self._area.kineticMove(round(value))
self._animationSpeed = speed
self._animationITime = now
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