ZetCode PyQt4 tutorial work with menus, toolbars, a statusbar, and a main application window

!/usr/bin/python
 -*- coding: utf-8 -*-

"""
ZetCode PyQt4 tutorial 

This program creates a statusbar.

author: Jan Bodnar
website: zetcode.com
last edited: September 2011
"""

import sys
from PyQt4 import QtGui

class Example(QtGui.QMainWindow):

    def __init__(self):
        # super(type[, object-or-type]): Return a proxy object that delegates method calls to a parent or sibling class of type.
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):               

        # To get the statusbar, we call the statusBar() method of the QtGui.QMainWindow class. The first call of the method creates a status bar. Subsequent calls return the statusbar object. The showMessage() displays a message on the statusbar.
        self.statusBar().showMessage('Ready')

        self.setGeometry(300, 300, 250, 150)
        self.setWindowTitle('Statusbar')
        self.show()

def main():

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

if __name__ == '__main__':
    main()

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#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
ZetCode PyQt4 tutorial 

This program creates a menubar. The
menubar has one menu with an exit action.

author: Jan Bodnar
website: zetcode.com
last edited: August 2011
"""

import sys
from PyQt4 import QtGui

class Example(QtGui.QMainWindow):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):               

        # A QtGui.QAction is an abstraction for actions performed with a menubar, toolbar or with a custom keyboard shortcut. In the above three lines, we create an action with a specific icon and an 'Exit' label. Furthermore, a shortcut is defined for this action. The third line creates a status tip which is shown in the statusbar when we hover a mouse pointer over the menu item.
        exitAction = QtGui.QAction(QtGui.QIcon('exit.png'), '&Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.setStatusTip('Exit application')
        # When we select this particular action, a triggered signal is emitted. The signal is connected to the quit() method of the QtGui.QApplication widget. This terminates the application.
        exitAction.triggered.connect(QtGui.qApp.quit)

        self.statusBar()

        # The menuBar() method creates a menubar. We create a file menu and append the exit action to it.
        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(exitAction)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Menubar')
        self.show()

def main():

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

if __name__ == '__main__':
    main()    

-------------------------------------------------------------------------------

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
ZetCode PyQt4 tutorial 

This program creates a toolbar.
The toolbar has one action, which
terminates the application if triggered.

author: Jan Bodnar
website: zetcode.com
last edited: September 2011
"""

import sys
from PyQt4 import QtGui

class Example(QtGui.QMainWindow):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):               

        # Similar to the menubar example above, we create an action object. The object has a label, icon and a shorcut. A quit() method of the QtGui.QMainWindow is connected to the triggered signal.
        exitAction = QtGui.QAction(QtGui.QIcon('exit24.png'), 'Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.triggered.connect(QtGui.qApp.quit)

        # Here we create a toolbar and plug and action object into it.
        self.toolbar = self.addToolBar('Exit')
        self.toolbar.addAction(exitAction)

        self.setGeometry(300, 300, 300, 200)
        self.setWindowTitle('Toolbar')
        self.show()

def main():

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

if __name__ == '__main__':
    main()

--------------------------------------------------------------------------------

#!/usr/bin/python
# -*- coding: utf-8 -*-

"""
ZetCode PyQt4 tutorial 

This program creates a skeleton of
a classic GUI application with a menubar,
toolbar, statusbar and a central widget. 

author: Jan Bodnar
website: zetcode.com
last edited: September 2011
"""

import sys
from PyQt4 import QtGui

class Example(QtGui.QMainWindow):

    def __init__(self):
        super(Example, self).__init__()

        self.initUI()

    def initUI(self):               

        # Here we create a text edit widget. We set it to be the central widget of the QtGui.QMainWindow. The central widget occupies all space that is left.
        textEdit = QtGui.QTextEdit()
        self.setCentralWidget(textEdit)

        exitAction = QtGui.QAction(QtGui.QIcon('exit24.png'), 'Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.setStatusTip('Exit application')
        exitAction.triggered.connect(self.close)

        self.statusBar()

        menubar = self.menuBar()
        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(exitAction)

        toolbar = self.addToolBar('Exit')
        toolbar.addAction(exitAction)

        self.setGeometry(300, 300, 350, 250)
        self.setWindowTitle('Main window')
        self.show()

def main():

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

if __name__ == '__main__':
    main()