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# mainwindow.cpp Example File

itemviews/addressbook/mainwindow.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2015 The Qt Company Ltd.
     ** Contact: http://www.qt.io/licensing/
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of The Qt Company Ltd nor the names of its
     **     contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
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     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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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);
         }
     }