No.2 PyQt学习

# -*- coding: utf-8 -*-
import sys
from PyQt4 import QtGui, QtCore


class Example(QtGui.QMainWindow):

    def __init__(self):
        #QtGui.QMainWindow.__init__(self)
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):
        QtGui.QToolTip.setFont(QtGui.QFont(‘SansSerif‘, 10))  # 设置一个用来提示消息的字体，10px字体SansSerif

        #定义主体内容
        label = QtGui.QLabel(‘Are you alone?‘,self)
        #label.move(60,60)
        label.setStatusTip(‘Yes or No‘)
        btn = QtGui.QPushButton(‘Sure‘, self)
        btn.setToolTip(‘This is a <b>QPushButton</b> widget‘)
        #btn.resize(60,25)
        btn.setGeometry(190, 210, 60, 25)
        qbtn = QtGui.QPushButton(‘Quit‘, self)
        #qbtn.resize(60, 25)
        qbtn.setGeometry(270, 210, 60, 25)
        qbtn.clicked.connect(self.qbtnClick)


        self.resize( 350, 250)
        self.statusBar().showMessage(‘Ready‘)
        self.center()
        self.setWindowTitle(‘Test‘)
        self.setWindowIcon(QtGui.QIcon(‘flat.png‘))
        exit = QtGui.QAction(QtGui.QIcon(‘flat.png‘), ‘Exit‘, self)
        exit.setShortcut(‘Ctrl+Q‘)
        exit.setStatusTip(‘Exit Application‘)
        exit.connect(exit, QtCore.SIGNAL(‘triggered()‘), QtGui.qApp, QtCore.SLOT(‘quit()‘))
        menubar = self.menuBar()                                                  #创建一个菜单栏
        file = menubar.addMenu(‘&File‘)                                          #创建一个菜单
        file.addAction(exit)                                                      #把动作对象添加到菜单中
        toolbar = self.addToolBar(‘Exit‘)
        toolbar.addAction(exit)

    def qbtnClick(self):
        reply = QtGui.QMessageBox.question(self, ‘Message‘,
                                           ‘Are you sure to quit?‘, QtGui.QMessageBox.Yes,
                                           QtGui.QMessageBox.No)
        if reply == QtGui.QMessageBox.Yes:
            quit()

    def center(self):
        qr = self.frameGeometry()                                       #得到该主窗口的矩形框架qr
        cp = QtGui.QDesktopWidget().availableGeometry().center()        #屏幕中间点的坐标cp
        qr.moveCenter(cp)                                               #将矩形框架移至屏幕正中央
        self.move(qr.topLeft())                                         #应用窗口移至矩形框架的左上角点

    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()


def main():
    app = QtGui.QApplication(sys.argv)
    main = Example()
    main.show()
    sys.exit(app.exec_())


if __name__ == ‘__main__‘:
    main()