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#!/usr/bin/env python
from PyQt4 import QtCore, QtGui
class StateSwitchEvent(QtCore.QEvent):
StateSwitchType = QtCore.QEvent.User + 256
def __init__(self, rand=0):
super(StateSwitchEvent, self).__init__(StateSwitchEvent.StateSwitchType)
self.m_rand = rand
def rand(self):
return self.m_rand
class QGraphicsRectWidget(QtGui.QGraphicsWidget):
def paint(self, painter, option, widget):
painter.fillRect(self.rect(), QtCore.Qt.blue)
class StateSwitchTransition(QtCore.QAbstractTransition):
def __init__(self, rand):
super(StateSwitchTransition, self).__init__()
self.m_rand = rand
def eventTest(self, event):
return (event.type() == StateSwitchEvent.StateSwitchType and
event.rand() == self.m_rand)
def onTransition(self, event):
pass
class StateSwitcher(QtCore.QState):
def __init__(self, machine):
super(StateSwitcher, self).__init__(machine)
self.m_stateCount = 0
self.m_lastIndex = 0
def onEntry(self, event):
n = QtCore.qrand() % self.m_stateCount + 1
while n == self.m_lastIndex:
n = QtCore.qrand() % self.m_stateCount + 1
self.m_lastIndex = n
self.machine().postEvent(StateSwitchEvent(n))
def onExit(self, event):
pass
def addState(self, state, animation):
self.m_stateCount += 1
trans = StateSwitchTransition(self.m_stateCount)
trans.setTargetState(state)
self.addTransition(trans)
trans.addAnimation(animation)
def createGeometryState(w1, rect1, w2, rect2, w3, rect3, w4, rect4, parent):
result = QtCore.QState(parent)
result.assignProperty(w1, 'geometry', rect1)
result.assignProperty(w1, 'geometry', rect1)
result.assignProperty(w2, 'geometry', rect2)
result.assignProperty(w3, 'geometry', rect3)
result.assignProperty(w4, 'geometry', rect4)
return result
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
button1 = QGraphicsRectWidget()
button2 = QGraphicsRectWidget()
button3 = QGraphicsRectWidget()
button4 = QGraphicsRectWidget()
button2.setZValue(1)
button3.setZValue(2)
button4.setZValue(3)
scene = QtGui.QGraphicsScene(0, 0, 300, 300)
scene.setBackgroundBrush(QtCore.Qt.black)
scene.addItem(button1)
scene.addItem(button2)
scene.addItem(button3)
scene.addItem(button4)
window = QtGui.QGraphicsView(scene)
window.setFrameStyle(0)
window.setAlignment(QtCore.Qt.AlignLeft | QtCore.Qt.AlignTop)
window.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
window.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
machine = QtCore.QStateMachine()
group = QtCore.QState()
timer = QtCore.QTimer()
timer.setInterval(1250)
timer.setSingleShot(True)
group.entered.connect(timer.start)
state1 = createGeometryState(button1, QtCore.QRect(100, 0, 50, 50),
button2, QtCore.QRect(150, 0, 50, 50),
button3, QtCore.QRect(200, 0, 50, 50),
button4, QtCore.QRect(250, 0, 50, 50), group)
state2 = createGeometryState(button1, QtCore.QRect(250, 100, 50, 50),
button2, QtCore.QRect(250, 150, 50, 50),
button3, QtCore.QRect(250, 200, 50, 50),
button4, QtCore.QRect(250, 250, 50, 50), group)
state3 = createGeometryState(button1, QtCore.QRect(150, 250, 50, 50),
button2, QtCore.QRect(100, 250, 50, 50),
button3, QtCore.QRect(50, 250, 50, 50),
button4, QtCore.QRect(0, 250, 50, 50), group)
state4 = createGeometryState(button1, QtCore.QRect(0, 150, 50, 50),
button2, QtCore.QRect(0, 100, 50, 50),
button3, QtCore.QRect(0, 50, 50, 50),
button4, QtCore.QRect(0, 0, 50, 50), group)
state5 = createGeometryState(button1, QtCore.QRect(100, 100, 50, 50),
button2, QtCore.QRect(150, 100, 50, 50),
button3, QtCore.QRect(100, 150, 50, 50),
button4, QtCore.QRect(150, 150, 50, 50), group)
state6 = createGeometryState(button1, QtCore.QRect(50, 50, 50, 50),
button2, QtCore.QRect(200, 50, 50, 50),
button3, QtCore.QRect(50, 200, 50, 50),
button4, QtCore.QRect(200, 200, 50, 50), group)
state7 = createGeometryState(button1, QtCore.QRect(0, 0, 50, 50),
button2, QtCore.QRect(250, 0, 50, 50),
button3, QtCore.QRect(0, 250, 50, 50),
button4, QtCore.QRect(250, 250, 50, 50), group)
group.setInitialState(state1)
animationGroup = QtCore.QParallelAnimationGroup()
anim = QtCore.QPropertyAnimation(button4, 'geometry')
anim.setDuration(1000)
anim.setEasingCurve(QtCore.QEasingCurve.OutElastic)
animationGroup.addAnimation(anim)
subGroup = QtCore.QSequentialAnimationGroup(animationGroup)
subGroup.addPause(100)
anim = QtCore.QPropertyAnimation(button3, 'geometry')
anim.setDuration(1000)
anim.setEasingCurve(QtCore.QEasingCurve.OutElastic)
subGroup.addAnimation(anim)
subGroup = QtCore.QSequentialAnimationGroup(animationGroup)
subGroup.addPause(150)
anim = QtCore.QPropertyAnimation(button2, 'geometry')
anim.setDuration(1000)
anim.setEasingCurve(QtCore.QEasingCurve.OutElastic)
subGroup.addAnimation(anim)
subGroup = QtCore.QSequentialAnimationGroup(animationGroup)
subGroup.addPause(200)
anim = QtCore.QPropertyAnimation(button1, 'geometry')
anim.setDuration(1000)
anim.setEasingCurve(QtCore.QEasingCurve.OutElastic)
subGroup.addAnimation(anim)
stateSwitcher = StateSwitcher(machine)
group.addTransition(timer.timeout, stateSwitcher)
stateSwitcher.addState(state1, animationGroup)
stateSwitcher.addState(state2, animationGroup)
stateSwitcher.addState(state3, animationGroup)
stateSwitcher.addState(state4, animationGroup)
stateSwitcher.addState(state5, animationGroup)
stateSwitcher.addState(state6, animationGroup)
stateSwitcher.addState(state7, animationGroup)
machine.addState(group)
machine.setInitialState(group)
machine.start()
window.resize(300, 300)
window.show()
QtCore.qsrand(QtCore.QTime(0, 0, 0).secsTo(QtCore.QTime.currentTime()))
sys.exit(app.exec_())
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