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

 /****************************************************************************
 **
 ** Copyright (C) 2008-2008 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 **
 ** This file is part of the documentation of the Qt Toolkit.
 **
 ** Licensees holding a valid Qt License Agreement may use this file in
 ** accordance with the rights, responsibilities and obligations
 ** contained therein.  Please consult your licensing agreement or
 ** contact [email protected] if any conditions of this licensing
 ** agreement are not clear to you.
 **
 ** Further information about Qt licensing is available at:
 ** http://trolltech.com/products/appdev/licensing.
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 ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
 ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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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(const QItemSelection &)),
         this, SLOT(updateActions(const 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);
     }
 }