Qt 4.0: mainwindow.cpp Example File (xml/saxbookmarks/mainwindow.cpp)

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# mainwindow.cpp Example File
xml/saxbookmarks/mainwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. 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
    ** General Public Licensing requirements will be met:
    ** http://www.trolltech.com/products/qt/opensource.html
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    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
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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.
        **
        ****************************************************************************/

        #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);
        }