PyQt 学习笔记1——自定义窗口框架

　　自定义一个属于自己的窗口，初始化时自动设置好在屏幕中央显示，重写退出事件的触发器 closeEvent()，并增加了设置图标，简化设置标题的函数名，其它类可以继承它：

 # -*- coding: utf-8 -*-

 import time
 import sys
 from PyQt4 import QtGui, QtCore

 class MyQwidget(QtGui.QWidget):

     def __init__(self, title=None, icon=None):
         QtGui.QWidget.__init__(self)
         self.setGeometry(300, 200, 600, 500)
         self.center()
         self.setTitle(title)
         self.setIcon(icon)

     def setTitle(self, title=None):
         if title != None:
             self.setWindowTitle(title)

     def setIcon(self, icon=None):
         if icon != None:
             self.setWindowIcon(QtGui.QIcon(icon))

     def resize(self, width, height):
         QtGui.QWidget.resize(self, width, height)
         self.center()

     def center(self):
         screen = QtGui.QDesktopWidget().screenGeometry()
         size = self.geometry()
         self.move((screen.width() - size.width()) / 2,
                   (screen.height() - size.height()) / 2)

     def closeEvent(self, event):
         reply = QtGui.QMessageBox.question(
             self, 'Message', 'Are you sure to close?', QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)
         if reply == QtGui.QMessageBox.Yes:
             event.accept()
         else:
             event.ignore()

 class Widget2(MyQwidget):
     pass

 class MainWindow(QtGui.QMainWindow, MyQwidget):

     def __init__(self, parent=None):
         QtGui.QMainWindow.__init__(self)
         self.resize(300, 200)
         self.setTitle('statusbar')
         self.statusBar().showMessage('Ready')

 app = QtGui.QApplication(sys.argv)

 w1 = Widget2(icon='image\\RK.gif', title='MyQwidget')
 w1.show()

 w2 = Widget2()
 w2.setTitle('hehe')
 w2.setIcon('image\\fire.gif')
 w2.resize(400, 300)
 w2.show()

 w3 = MainWindow()
 w3.show()

 sys.exit(app.exec_())

　　运行后截图如下：（均处于整个屏幕的中央）