- Qt 5.5
- Qt Widgets
- Address Book Example
- mainwindow.cpp Example File
- Qt 5.5.1 Reference Documentation

# mainwindow.cpp Example File

itemviews/addressbook/mainwindow.cpp

    /****************************************************************************
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    ** Copyright (C) 2015 The Qt Company Ltd.
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    ** This file is part of the examples of the Qt Toolkit.
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    ** $QT_BEGIN_LICENSE:BSD$
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    #include "mainwindow.h"

    #include <QAction>
    #include <QFileDialog>
    #include <QMenuBar>

    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);
        }
    }