pyqt4基础练习

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

# icon.py

import sys
from PyQt4 import QtGui, QtCore



class Icon(QtGui.QWidget):
    def __init__(self, parent=None):
        QtGui.QWidget.__init__(self, parent)
        #设置窗体大小
        self.setGeometry(300, 300, 250, 150)
        #为窗体设置标题以及图标
        self.setWindowTitle('Icon')
        self.setWindowIcon(QtGui.QIcon('icons/dog.png'))
        #设置提示
        self.setToolTip('This is a <b>QWidget</b> widget')
        QtGui.QToolTip.setFont(QtGui.QFont('OldEnglish', 10))
        #设置按钮属性
        quit = QtGui.QPushButton('Close', self)
        quit.setGeometry(10, 10, 64,35)
        #设置信号与槽
        self.connect(quit, QtCore.SIGNAL('clicked()'),
            QtGui.qApp, QtCore.SLOT('quit()'))
        #调用窗体居中函数
        self.center()
        #窗体居中函数
    def center(self):
        screen = QtGui.QDesktopWidget().screenGeometry()
        size = self.geometry()
        self.move((screen.width()-size.width())/2, (screen.height()-size.height())/2)

         #窗体退出事件处理函数
    def closeEvent(self, event):
        reply = QtGui.QMessageBox.question(self, 'Message',
            "Are you sure to quit?", QtGui.QMessageBox.Yes, QtGui.QMessageBox.No)

        if reply == QtGui.QMessageBox.Yes:
            event.accept()
        else:
            event.ignore()


class MainWindow(QtGui.QMainWindow):
    def __init__(self):
        QtGui.QMainWindow.__init__(self)
        self.statusBar().showMessage('Ready')



app = QtGui.QApplication(sys.argv)
icon = Icon()
icon.show()
sys.exit(app.exec_())