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# contenttab.cpp Example File
demos/embedded/desktopservices/contenttab.cpp

     /****************************************************************************
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     ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
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     ** This file is part of the demonstration applications of the Qt Toolkit.
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     ** 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.
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     ** rights.  These rights are described in the Nokia Qt LGPL Exception
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     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 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 the GNU General Public License version 3.0 requirements will be
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     // EXTERNAL INCLUDES
     #include <QKeyEvent>
     #include <QMessageBox>
     #include <QListWidget>
     #include <QVBoxLayout>
     #include <QFileInfoList>
     #include <QListWidgetItem>

     // INTERNAL INCLUDES

     // CLASS HEADER
     #include "contenttab.h"

     // CONSTRUCTORS & DESTRUCTORS
     ContentTab::ContentTab(QWidget *parent) :
             QListWidget(parent)
     {
         setDragEnabled(false);
         setIconSize(QSize(45, 45));
     }

     ContentTab::~ContentTab()
     {
     }

     // NEW PUBLIC METHODS
     void ContentTab::init(const QDesktopServices::StandardLocation &location,
                           const QString &filter,
                           const QString &icon)
     {
         setContentDir(location);
         QStringList filterList;
         filterList = filter.split(";");
         m_ContentDir.setNameFilters(filterList);
         setIcon(icon);

         connect(this, SIGNAL(itemClicked(QListWidgetItem*)),
                 this, SLOT(openItem(QListWidgetItem*)));

         populateListWidget();
     }

     // NEW PROTECTED METHODS
     void ContentTab::setContentDir(const QDesktopServices::StandardLocation &location)
     {
         m_ContentDir.setPath(QDesktopServices::storageLocation(location));
     }

     void ContentTab::setIcon(const QString &icon)
     {
         m_Icon = QIcon(icon);
     }

     void ContentTab::populateListWidget()
     {
         QFileInfoList fileList = m_ContentDir.entryInfoList(QDir::Files, QDir::Time);
         foreach(QFileInfo item, fileList) {
             new QListWidgetItem(m_Icon, itemName(item), this);
         }
     }

     QString ContentTab::itemName(const QFileInfo &item)
     {
         return QString(item.baseName() + "." + item.completeSuffix());
     }

     QUrl ContentTab::itemUrl(QListWidgetItem *item)
     {
         return QUrl("file:///" + m_ContentDir.absolutePath() + "/" + item->text());
     }

     void ContentTab::keyPressEvent(QKeyEvent *event)
     {
         switch (event->key()) {
         case Qt::Key_Up:
             if (currentRow() == 0) {
                 setCurrentRow(count() - 1);
             } else {
                 setCurrentRow(currentRow() - 1);
             }
             break;
         case Qt::Key_Down:
             if (currentRow() == (count() - 1)) {
                 setCurrentRow(0);
             } else {
                 setCurrentRow(currentRow() + 1);
             }
             break;
         case Qt::Key_Select:
             openItem(currentItem());
         default:
             QListWidget::keyPressEvent(event);
             break;
         }
     }

     void ContentTab::handleErrorInOpen(QListWidgetItem *item)
     {
         Q_UNUSED(item);
         QMessageBox::warning(this, tr("Operation Failed"), tr("Unkown error!"), QMessageBox::Close);
     }

     // NEW SLOTS
     void ContentTab::openItem(QListWidgetItem *item)
     {
     #if defined(Q_OS_SYMBIAN) && defined(Q_CC_NOKIAX86)
         // Opening music files doesn't work in Symbian emulator and in some SDKs freezes the
         // emulator entirely, so prevent it.
         QStringList nameFilters = m_ContentDir.nameFilters();
         if (nameFilters.contains("*.mp3")) {
             QMessageBox::warning(this, tr("Operation Failed"), tr("Action not supported in emulator."),
                                  QMessageBox::Close);
         } else
     #endif
         {
             bool ret = QDesktopServices::openUrl(itemUrl(item));
             if (!ret)
                 handleErrorInOpen(item);
         }
     }

     // End of File