一个用Python写的简易挂机锁

一个用Python写的简易挂机锁

基本功能实现了，但是不够漂亮

屏蔽了Alt+F4，但是Ctrl+Alt+Del没能屏蔽

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

u"""
一个挂机锁软件。

author: Mpc
last edited: Mat 2014
"""

import sys
import random
from PyQt4 import QtGui, QtCore


class Example(QtGui.QWidget):
    
    def __init__(self):
        super(Example, self).__init__()
        
        self.initUI()
        
    def initUI(self):
        #Label
        lbl1 = QtGui.QLabel(u'密    码：', self)
        lbl1.setAlignment(QtCore.Qt.AlignRight)

        lbl2 = QtGui.QLabel(u'确认密码：', self)
        #LineEdit
        self.le1 = QtGui.QLineEdit(self)
        self.le2 = QtGui.QLineEdit(self)
        #PushButton
        okButton = QtGui.QPushButton("OK")
        okButton.clicked.connect(self.okButton_reponds)
        cancelButton = QtGui.QPushButton("Cancel")
        cancelButton.clicked.connect(self.cancelButton_reponds)
        #hbox1
        hbox1 = QtGui.QHBoxLayout()
        hbox1.addStretch(1)
        hbox1.addWidget(lbl1)
        hbox1.addWidget(self.le1)
        hbox1.addStretch(1)
        #hbox2
        hbox2 = QtGui.QHBoxLayout()
        hbox2.addStretch(1)
        hbox2.addWidget(lbl2)
        hbox2.addWidget(self.le2)
        hbox2.addStretch(1)
        #hbox3
        hbox3 = QtGui.QHBoxLayout()
        hbox3.addStretch(1)
        hbox3.addWidget(okButton)
        hbox3.addWidget(cancelButton)
        hbox3.addStretch(1)
        
        vbox = QtGui.QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox1)
        vbox.addLayout(hbox2)
        vbox.addLayout(hbox3)
        vbox.addStretch(1)
        
        self.setLayout(vbox)     
        
        self.setGeometry(300, 300, 250, 150)        
        self.setWindowTitle(u'挂机锁') 
        self.show()
        
    def okButton_reponds(self):
        if not self.le1.text().compare(self.le2.text()):
            if self.le1.text() == '':
                QtGui.QMessageBox.information(self, 'Error', u'请键入密码！！')
            else:
                self.lockScreen = LockScreen()
                self.lockScreen.password_lock = self.le1.text()
                self.close()
        else:
            QtGui.QMessageBox.information(self, 'Error', u'密码不一致')
            self.le1.setText('')
            self.le2.setText('')
            
            
    def keyPressEvent(self, event):
        keyEvent = QtGui.QKeyEvent(event)
        if keyEvent.key() == QtCore.Qt.Key_Return:
            self.okButton_reponds()
    
    def cancelButton_reponds(self):
        self.le1.setText('')
        self.le2.setText('')



class LockScreen(QtGui.QWidget):

        
    def __init__(self):
        super(LockScreen, self).__init__()
        
        self.initUI()
        #password
        self.password_lock = ''
        
    def initUI(self):
        
        #Label
        lbl1 = QtGui.QLabel(u'密    码：', self)
        lbl1.setAlignment(QtCore.Qt.AlignRight)

        lbl2 = QtGui.QLabel(u'挂机中.......请勿乱动！！', self)
        lbl2.setAlignment(QtCore.Qt.AlignRight)
        lbl2.setFont(QtGui.QFont(u"华文行楷", 50, 20))
        #LineEdit
        self.le1 = QtGui.QLineEdit(self)

        #PushButton
        okButton = QtGui.QPushButton("OK")
        okButton.clicked.connect(self.okButton_reponds)
        cancelButton = QtGui.QPushButton("Cancel")
        cancelButton.clicked.connect(self.cancelButton_reponds)
        #hbox1
        hbox1 = QtGui.QHBoxLayout()
        hbox1.addStretch(1)
        hbox1.addWidget(lbl1)
        hbox1.addWidget(self.le1)
        hbox1.addStretch(1)
        #hbox2
        hbox2 = QtGui.QHBoxLayout()
        hbox2.addStretch(1)
        hbox2.addWidget(lbl2)

        hbox2.addStretch(1)
        #hbox3
        hbox3 = QtGui.QHBoxLayout()
        hbox3.addStretch(1)
        hbox3.addWidget(okButton)
        hbox3.addWidget(cancelButton)
        hbox3.addStretch(1)
        
        vbox = QtGui.QVBoxLayout()
        vbox.addStretch(1)
        vbox.addLayout(hbox2)
        vbox.addStretch(1)
        vbox.addLayout(hbox1) 
        vbox.addLayout(hbox3)
        vbox.addStretch(1)
        
        self.setLayout(vbox)
        
        self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)
        self.showFullScreen()
        
        #backgroundimage
        self.setAutoFillBackground(True)
        palette = QtGui.QPalette()
#        palette.setBrush(QtGui.QPalette.Window, QtGui.QBrush(QtGui.QPixmap("g:/Python/pictures/" +str(random.randint(1, 500))+".jpg").scaled(self.size(), QtCore.Qt.IgnoreAspectRatio, QtCore.Qt.SmoothTransformation)))
        palette.setBrush(QtGui.QPalette.Window, QtGui.QBrush(QtGui.QColor(170, 58, 146)))
        self.setPalette(palette)
             
        self.setWindowTitle(u'挂机锁') 
        
        
           
        self.show()
        
    def okButton_reponds(self):

        if self.password_lock == self.le1.text():
            QtCore.QCoreApplication.instance().quit()
        elif self.le1.text() == '':
            QtGui.QMessageBox.information(self, 'Error', u'请键入密码！！')
        elif (not (self.le1.text() == '') and not self.password_lock == self.le1.text()):
            QtGui.QMessageBox.information(self, 'Error', u'密码错误！！')
            self.le1.setText('')
            
    def keyPressEvent(self, event):
        keyEvent = QtGui.QKeyEvent(event)
        
           
        if keyEvent.key() == QtCore.Qt.Key_Return:
            self.okButton_reponds()
    

#屏蔽Alt+F4
    def closeEvent(self, event):
        event.ignore()
        
    def cancelButton_reponds(self):
        self.le1.setText('')
        self.le2.setText('')
    

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


if __name__ == '__main__':
    main()