Reimplementing event handler

Events in PyQt4 are processed often by reimplementing event handlers.

#!/usr/bin/python

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

"""

ZetCode PyQt4 tutorial 

In this example, we reimplement an

event handler. 

author: Jan Bodnar

website: zetcode.com

last edited: October 2011

"""

import sys

from PyQt4 import QtGui, QtCore

class Example(QtGui.QWidget):

    def __init__(self):

        super(Example, self).__init__()

        self.initUI()

    def initUI(self):      

        self.setGeometry(300, 300, 250, 150)

        self.setWindowTitle('Event handler')

        self.show()

    def keyPressEvent(self, e):

        if e.key() == QtCore.Qt.Key_Escape:

            self.close()

def main():

    app = QtGui.QApplication(sys.argv)

    ex = Example()

    sys.exit(app.exec_())

if __name__ == '__main__':

    main()

In our example, we reimplement the keyPressEvent() event handler.

def keyPressEvent(self, e):

    if e.key() == QtCore.Qt.Key_Escape:

        self.close()

If we click the Escape button, the application terminates.

巴特西

Reimplementing event handler

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