mainwindow.cpp Example File
xml/streambookmarks/mainwindow.cpp

 /****************************************************************************
 **
 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
 ** All rights reserved.
 ** Contact: Nokia Corporation (qt-info@nokia.com)
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** No Commercial Usage
 ** This file contains pre-release code and may not be distributed.
 ** You may use this file in accordance with the terms and conditions
 ** contained in the Technology Preview License Agreement accompanying
 ** this package.
 **
 ** GNU Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain additional
 ** rights.  These rights are described in the Nokia Qt LGPL Exception
 ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
 **
 ** If you have questions regarding the use of this file, please contact
 ** Nokia at qt-info@nokia.com.
 **
 **
 **
 **
 **
 **
 **
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtGui>

 #include "mainwindow.h"
 #include "xbelreader.h"
 #include "xbelwriter.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("QXmlStream 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();

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

     XbelReader reader(treeWidget);
     if (!reader.read(&file)) {
         QMessageBox::warning(this, tr("QXmlStream Bookmarks"),
                              tr("Parse error in file %1:\n\n%2")
                              .arg(fileName)
                              .arg(reader.errorString()));
     } else {
         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("QXmlStream Bookmarks"),
                              tr("Cannot write file %1:\n%2.")
                              .arg(fileName)
                              .arg(file.errorString()));
         return;
     }

     XbelWriter writer(treeWidget);
     if (writer.writeFile(&file))
         statusBar()->showMessage(tr("File saved"), 2000);
 }

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

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

     saveAsAct = new QAction(tr("&Save As..."), this);
     saveAsAct->setShortcuts(QKeySequence::SaveAs);
     connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

     exitAct = new QAction(tr("E&xit"), this);
     exitAct->setShortcuts(QKeySequence::Quit);
     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);
 }