mainwindow.cpp Example File

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 #include <QtWidgets>
 #include "mainwindow.h"

 MainWindow::MainWindow()
 {
     addressWidget = new AddressWidget;
     setCentralWidget(addressWidget);
     createMenus();
     setWindowTitle(tr("Address Book"));
 }

 void MainWindow::createMenus()
 {
     fileMenu = menuBar()->addMenu(tr("&File"));

     openAct = new QAction(tr("&Open..."), this);
     fileMenu->addAction(openAct);
     connect(openAct, SIGNAL(triggered()),
         this, SLOT(openFile()));

     saveAct = new QAction(tr("&Save As..."), this);
     fileMenu->addAction(saveAct);
     connect(saveAct, SIGNAL(triggered()),
         this, SLOT(saveFile()));

     fileMenu->addSeparator();

     exitAct = new QAction(tr("E&xit"), this);
     fileMenu->addAction(exitAct);
     connect(exitAct, SIGNAL(triggered()),
         this, SLOT(close()));

     toolMenu = menuBar()->addMenu(tr("&Tools"));

     addAct = new QAction(tr("&Add Entry..."), this);
     toolMenu->addAction(addAct);
     connect(addAct, SIGNAL(triggered()),
         addressWidget, SLOT(addEntry()));

     editAct = new QAction(tr("&Edit Entry..."), this);
     editAct->setEnabled(false);
     toolMenu->addAction(editAct);
     connect(editAct, SIGNAL(triggered()),
         addressWidget, SLOT(editEntry()));

     toolMenu->addSeparator();

     removeAct = new QAction(tr("&Remove Entry"), this);
     removeAct->setEnabled(false);
     toolMenu->addAction(removeAct);
     connect(removeAct, SIGNAL(triggered()),
         addressWidget, SLOT(removeEntry()));

     connect(addressWidget, SIGNAL(selectionChanged(QItemSelection)),
         this, SLOT(updateActions(QItemSelection)));
 }

 void MainWindow::openFile()
 {
     QString fileName = QFileDialog::getOpenFileName(this);
     if (!fileName.isEmpty()) {
         addressWidget->readFromFile(fileName);
     }
 }

 void MainWindow::saveFile()
 {
     QString fileName = QFileDialog::getSaveFileName(this);
     if (!fileName.isEmpty()) {
         addressWidget->writeToFile(fileName);
     }
 }

 void MainWindow::updateActions(const QItemSelection &selection)
 {
     QModelIndexList indexes = selection.indexes();

     if (!indexes.isEmpty()) {
         removeAct->setEnabled(true);
         editAct->setEnabled(true);
     } else {
         removeAct->setEnabled(false);
         editAct->setEnabled(false);
     }
 }