# -*- coding:utf8 -*-

 from PyQt4.QtGui import *

 from PyQt4.QtCore import *

 import sys

 class ani(QWidget):

     def __init__(self):

         super(ani, self).__init__()

         self.OrigHeight = 50

         self.ChangeHeight = 150

         self.setGeometry(QRect(500, 400, 150, self.OrigHeight))  # 在X=500， Y=400 ， Length=150 ,   Height=50

         self.btn = QPushButton(u'展开', self)

         self.btn.setGeometry(10, 10, 60, 35)

         self.machine = QStateMachine()

         self.connect(self.btn, SIGNAL('clicked()'), self.change)

     # 动画效果修改窗体大小

     def change(self):

         CurrentHeight = self.height()

         if self.OrigHeight == CurrentHeight:

             startHeight = self.OrigHeight

             endHeight = self.ChangeHeight

             self.btn.setText(u'收缩')

         else:

             startHeight = self.ChangeHeight

             endHeight = self.OrigHeight

             self.btn.setText(u'展开')

         self.animation = QPropertyAnimation(window, 'geometry')

         self.animation.setDuration(800)

         self.animation.setStartValue(QRect(500, 400, 150, startHeight))

         self.animation.setEndValue(QRect(500, 400, 150, endHeight))

         self.animation.start()

 if __name__ == '__main__':

     app = QApplication(sys.argv)

     window = ani()

     window.show()

     sys.exit(app.exec_())