app.cpp Example File

    /****************************************************************************
     **
     ** Portions Copyright (C) 2012 Research In Motion Limited.
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Research In Motion Ltd. (http://www.rim.com/company/contact/)
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the BB10 Platform and is derived
     ** from a similar file that is part of the Qt Toolkit.
     **
     ** 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 Research In Motion, nor the name of Nokia
     **     Corporation and its Subsidiary(-ies), nor the names of its
     **     contributors may be used to endorse or promote products
     **     derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "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
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ****************************************************************************/

    #include <bb/cascades/Application>
    #include <bb/cascades/Control>
    #include <bb/cascades/QmlDocument>
    #include <bb/cascades/Page>

    #include "app.hpp"
    #include "xbelgenerator.hpp"
    #include "xbelhandler.hpp"

    using namespace bb::cascades;

    App::App()
    {
        // Load the main QML file and make the App object available as context property
        QmlDocument *qml = QmlDocument::create("asset:///main.qml");
        if (!qml->hasErrors()) {
            qml->setContextProperty("_app", this);
            Page *appPage = qml->createRootObject<Page>();
            if (appPage) {
                Application::instance()->setScene(appPage);

                // Retrieve the tree container control from the QML file
                m_treeContainer = appPage->findChild<Container*>("treeContainer");
            }
        }
    }

    void App::load(const QString &fileName)
    {
        // Do sanity check
        if (!m_treeContainer)
            return;

        // Update the status property
        m_status = tr("Loading...");
        emit statusChanged();

        // Clean all previous generated bookmark controls from the tree container
        m_treeContainer->removeAll();

        // Create the XBEL handler and pass the tree container it will work on
        XbelHandler handler(m_treeContainer);

        // Create the SAX reader and set the XBEL handler as default handler
        QXmlSimpleReader reader;
        reader.setContentHandler(&handler);
        reader.setErrorHandler(&handler);

        // Open the XBEL file which the user has selected
        QFile file("app/native/assets/" + fileName);
        file.open(QIODevice::ReadOnly);

        // Wrap the XBEL file into a XML input source
        QXmlInputSource xmlInputSource(&file);

        // Parse XBEL file and generate the bookmark controls
        const bool ok = reader.parse(xmlInputSource);

        // Update the status property again
        if (ok)
            m_status = tr("Loaded successfully");
        else
            m_status = handler.errorString();

        emit statusChanged();
    }

    void App::save()
    {
        // Do sanity check
        if (!m_treeContainer)
            return;

        // Update the status property
        m_status = tr("Saving...");
        emit statusChanged();

        const QString fileName("tmp/saxbookmarks.xbel");

        // Open the target file where the modified XBEL document will be written to
        QFile file(fileName);
        file.open(QIODevice::WriteOnly);

        // Create the XBEL generator on the tree container and let it generate the XBEL document from the bookmark controls
        XbelGenerator generator(m_treeContainer);
        const bool ok = generator.write(&file);

        // Update the status property again
        if (ok)
            m_status = tr("Saved successfully");
        else
            m_status = tr("Error while saving");

        emit statusChanged();
    }

    QString App::status() const
    {
        return m_status;
    }