PyQt having a status bar & menu bar QWidget

Question

I am trying to create a PyQt application that has both status bar and a menu bar with other Widgets in the window. Below is the code which I managed to get it run with class QtGui.QMainWindow method. But as I intend to add further features, I realise I must use QtGui.QWidget instead.

Here is the code:

import sys
from PyQt4 import QtGui, QtCore

### How can I use QtGui.QWidget here??? ###

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

     def initUI(self):               

        QtGui.QToolTip.setFont(QtGui.QFont('SansSerif', 10))    
        self.setToolTip('This is a <b>QWidget</b> Window widget')

        exitAction = QtGui.QAction(QtGui.QIcon('exit-icon-2.png'), '&Exit', self)

        exitAction.setShortcut('Ctrl+Q')                        
        exitAction.setStatusTip('Exit/Terminate application')   

        exitAction.triggered.connect(QtGui.qApp.quit)           

        self.statusBar()                                       

        menubar = self.menuBar()                                
        menubar.setToolTip('This is a <b>QWidget</b> for MenuBar')                                

        fileMenu = menubar.addMenu('&File')                     
        fileMenu.addAction(exitAction)                          
        toolbar = self.addToolBar('Exit')                       
        toolbar.addAction(exitAction)                           

        qbtn = QtGui.QPushButton('Quit', self)                  

        qbtn.setToolTip('This is a <b>QPushButton</b> widget')  
        qbtn.clicked.connect(self.launchAAA)                    
        qbtn.resize(qbtn.sizeHint())                           
        qbtn.move(170, 190)                                     



        self.setGeometry(500, 180, 400, 400)                    
        self.setWindowTitle('Quit button with Message')        
        self.show()                                            

    def launchAAA(self, event):

        reply = QtGui.QMessageBox.question(self, 'Message',
        "Are you sure to quit?", QtGui.QMessageBox.Yes | 
        QtGui.QMessageBox.No, QtGui.QMessageBox.No)

        if reply == QtGui.QMessageBox.Yes:  
           QtGui.QApplication.quit()
        else:
           pass                                              


def main():

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

   sys.exit(app.exec_())                                       


if __name__ == '__main__':
   main()  

I am under the impression that menu bar and title bars can be created using QWidget method, but here it doesn't work. I intend to add an LCD function to the application using QtGui.QLCDNumber.

Any suggestions on how to fix the above problem. Thanks

Answer 1

You could just move your buttons/labels/etc. to a QWidget, and add this widget to the main window. Here is how it could look like (I changed the imports so that it is a bit more readable).

Your content widget class :

class ExampleContent(QWidget):
    def __init__(self, parent):
        QWidget.__init__(self, parent)
        self.initUI()

    def initUI(self):        
        qbtn = QPushButton('Quit', self)
        qbtn.setToolTip('This is a <b>QPushButton</b> widget')
        qbtn.clicked.connect(self.launchAAA)                 
        qbtn.resize(qbtn.sizeHint())                           
        qbtn.move(170, 190)

    def launchAAA(self):
        reply = QMessageBox.question(self, 'Message',
        "Are you sure to quit?", QMessageBox.Yes | 
        QMessageBox.No, QMessageBox.No)

        if reply == QMessageBox.Yes:  
            QApplication.quit()
        else:
            pass

Add it to the main window :

class Example(QMainWindow):                                  
    def __init__(self):
        super(Example, self).__init__()
        self.initUI()

    def initUI(self):               
        QToolTip.setFont(QFont('SansSerif', 10))
        self.setToolTip('This is a <b>QWidget</b> Window widget')

        exitAction = QAction(QIcon('exit-icon-2.png'), '&Exit', self)
        exitAction.setShortcut('Ctrl+Q')
        exitAction.setStatusTip('Exit/Terminate application')
        exitAction.triggered.connect(qApp.quit)

        self.statusBar()

        menubar = self.menuBar()        
        menubar.setToolTip('This is a <b>QWidget</b> for MenuBar')

        fileMenu = menubar.addMenu('&File')
        fileMenu.addAction(exitAction)
        toolbar = self.addToolBar('Exit')
        toolbar.addAction(exitAction)

        # create the widget here
        content = ExampleContent(self)
        self.setCentralWidget(content)

        self.setGeometry(500, 180, 400, 400)     
        self.setWindowTitle('Quit button with Message')
        self.show()

And everything just works as before, except that you new have a QWidget in the middle, instead of a QMainWindow. Hope that helped !