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# mainwindow.cpp Example File
itemviews/addressbook/mainwindow.cpp

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     #include <QtGui>
     #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);
         }
     }