mainwindow.cpp Example File
^{xml/saxbookmarks/mainwindow.cpp}

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    **
    ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
    ** This file may be used under the terms of the GNU General Public
    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
    ** this file.  Please review the following information to ensure GNU
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    ** review the following information:
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    ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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    #include <QtGui>

    #include "mainwindow.h"
    #include "xbelgenerator.h"
    #include "xbelhandler.h"

    MainWindow::MainWindow()
    {
        QStringList labels;
        labels << tr("Title") << tr("Location");

        treeWidget = new QTreeWidget;
        treeWidget->header()->setResizeMode(QHeaderView::Stretch);
        treeWidget->setHeaderLabels(labels);
        setCentralWidget(treeWidget);

        createActions();
        createMenus();

        statusBar()->showMessage(tr("Ready"));

        setWindowTitle(tr("SAX Bookmarks"));
        resize(480, 320);
    }

    void MainWindow::open()
    {
        QString fileName =
                QFileDialog::getOpenFileName(this, tr("Open Bookmark File"),
                                             QDir::currentPath(),
                                             tr("XBEL Files (*.xbel *.xml)"));
        if (fileName.isEmpty())
            return;

        treeWidget->clear();

        XbelHandler handler(treeWidget);
        QXmlSimpleReader reader;
        reader.setContentHandler(&handler);
        reader.setErrorHandler(&handler);

        QFile file(fileName);
        if (!file.open(QFile::ReadOnly | QFile::Text)) {
            QMessageBox::warning(this, tr("SAX Bookmarks"),
                                 tr("Cannot read file %1:\n%2.")
                                 .arg(fileName)
                                 .arg(file.errorString()));
            return;
        }

        QXmlInputSource xmlInputSource(&file);
        if (reader.parse(xmlInputSource))
            statusBar()->showMessage(tr("File loaded"), 2000);
    }

    void MainWindow::saveAs()
    {
        QString fileName =
                QFileDialog::getSaveFileName(this, tr("Save Bookmark File"),
                                             QDir::currentPath(),
                                             tr("XBEL Files (*.xbel *.xml)"));
        if (fileName.isEmpty())
            return;

        QFile file(fileName);
        if (!file.open(QFile::WriteOnly | QFile::Text)) {
            QMessageBox::warning(this, tr("SAX Bookmarks"),
                                 tr("Cannot write file %1:\n%2.")
                                 .arg(fileName)
                                 .arg(file.errorString()));
            return;
        }

        XbelGenerator generator(treeWidget);
        if (generator.write(&file))
            statusBar()->showMessage(tr("File saved"), 2000);
    }

    void MainWindow::about()
    {
       QMessageBox::about(this, tr("About SAX Bookmarks"),
                tr("The <b>SAX Bookmarks</b> example demonstrates how to use Qt's "
                   "SAX classes to read XML documents and how to generate XML by "
                   "hand."));
    }

    void MainWindow::createActions()
    {
        openAct = new QAction(tr("&Open..."), this);
        openAct->setShortcut(tr("Ctrl+O"));
        connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

        saveAsAct = new QAction(tr("&Save As..."), this);
        saveAsAct->setShortcut(tr("Ctrl+S"));
        connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

        exitAct = new QAction(tr("E&xit"), this);
        exitAct->setShortcut(tr("Ctrl+Q"));
        connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

        aboutAct = new QAction(tr("&About"), this);
        connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

        aboutQtAct = new QAction(tr("About &Qt"), this);
        connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
    }

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

        menuBar()->addSeparator();

        helpMenu = menuBar()->addMenu(tr("&Help"));
        helpMenu->addAction(aboutAct);
        helpMenu->addAction(aboutQtAct);
    }