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diff --git a/src/assistant/help/qhelpcontentwidget.h b/src/assistant/help/qhelpcontentwidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the Qt Assistant 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QHELPCONTENTWIDGET_H
+#define QHELPCONTENTWIDGET_H
+
+#include <QtHelp/qhelp_global.h>
+
+#include <QtCore/QQueue>
+#include <QtCore/QString>
+#include <QtWidgets/QTreeView>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Help)
+
+class QHelpEnginePrivate;
+class QHelpDBReader;
+class QHelpContentItemPrivate;
+class QHelpContentModelPrivate;
+class QHelpEngine;
+class QHelpContentProvider;
+
+class QHELP_EXPORT QHelpContentItem
+{
+public:
+    ~QHelpContentItem();
+
+    QHelpContentItem *child(int row) const;
+    int childCount() const;
+    QString title() const;
+    QUrl url() const;
+    int row() const;
+    QHelpContentItem *parent() const;
+    int childPosition(QHelpContentItem *child) const;
+
+private:
+    QHelpContentItem(const QString &name, const QString &link,
+        QHelpDBReader *reader, QHelpContentItem *parent = 0);
+    void appendChild(QHelpContentItem *child);
+
+    QHelpContentItemPrivate *d;
+    friend class QHelpContentProvider;
+};
+
+class QHELP_EXPORT QHelpContentModel : public QAbstractItemModel
+{
+    Q_OBJECT
+
+public:
+    ~QHelpContentModel();
+
+    void createContents(const QString &customFilterName);
+    QHelpContentItem *contentItemAt(const QModelIndex &index) const;
+
+    QVariant data(const QModelIndex &index, int role) const;
+    QModelIndex index(int row, int column,
+        const QModelIndex &parent = QModelIndex()) const;
+    QModelIndex parent(const QModelIndex &index) const;
+    int rowCount(const QModelIndex &parent = QModelIndex()) const;
+    int columnCount(const QModelIndex &parent = QModelIndex()) const;
+    bool isCreatingContents() const;
+
+Q_SIGNALS:
+    void contentsCreationStarted();
+    void contentsCreated();
+
+private Q_SLOTS:
+    void insertContents();
+    void invalidateContents(bool onShutDown = false);
+
+private:
+    QHelpContentModel(QHelpEnginePrivate *helpEngine);
+    QHelpContentModelPrivate *d;
+    friend class QHelpEnginePrivate;
+};
+
+class QHELP_EXPORT QHelpContentWidget : public QTreeView
+{
+    Q_OBJECT
+
+public:
+    QModelIndex indexOf(const QUrl &link);
+
+Q_SIGNALS:
+    void linkActivated(const QUrl &link);
+
+private Q_SLOTS:
+    void showLink(const QModelIndex &index);
+
+private:
+    bool searchContentItem(QHelpContentModel *model,
+        const QModelIndex &parent, const QString &path);
+    QModelIndex m_syncIndex;
+
+private:
+    QHelpContentWidget();
+    friend class QHelpEngine;
+};
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif
+