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diff --git a/src/assistant/tools/assistant/centralwidget.h b/src/assistant/tools/assistant/centralwidget.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 CENTRALWIDGET_H
+#define CENTRALWIDGET_H
+
+#include <QtCore/QUrl>
+
+#include <QtGui/QTabBar>
+#include <QtGui/QWidget>
+
+QT_BEGIN_NAMESPACE
+
+class FindWidget;
+class HelpViewer;
+class QStackedWidget;
+
+class TabBar : public QTabBar
+{
+    Q_OBJECT
+public:
+    TabBar(QWidget *parent = 0);
+    ~TabBar();
+
+    int addNewTab(const QString &title);
+    void setCurrent(HelpViewer *viewer);
+    void removeTabAt(HelpViewer *viewer);
+
+public slots:
+    void titleChanged();
+
+signals:
+    void currentTabChanged(HelpViewer *viewer);
+    void addBookmark(const QString &title, const QString &url);
+
+private slots:
+    void slotCurrentChanged(int index);
+    void slotTabCloseRequested(int index);
+    void slotCustomContextMenuRequested(const QPoint &pos);
+};
+
+class CentralWidget : public QWidget
+{
+    Q_OBJECT
+
+public:
+    CentralWidget(QWidget *parent = 0);
+    ~CentralWidget();
+
+    static CentralWidget *instance();
+
+    QUrl currentSource() const;
+    QString currentTitle() const;
+
+    bool hasSelection() const;
+    bool isForwardAvailable() const;
+    bool isBackwardAvailable() const;
+
+    HelpViewer *viewerAt(int index) const;
+    HelpViewer *currentHelpViewer() const;
+
+    void addPage(HelpViewer *page, bool fromSearch = false);
+    void removePage(int index);
+
+    int currentIndex() const;
+    void setCurrentPage(HelpViewer *page);
+
+    void connectTabBar();
+
+public slots:
+    void copy();
+    void home();
+
+    void zoomIn();
+    void zoomOut();
+    void resetZoom();
+
+    void forward();
+    void nextPage();
+
+    void backward();
+    void previousPage();
+
+    void print();
+    void pageSetup();
+    void printPreview();
+
+    void setSource(const QUrl &url);
+    void setSourceFromSearch(const QUrl &url);
+
+    void findNext();
+    void findPrevious();
+    void find(const QString &text, bool forward, bool incremental);
+
+    void activateTab();
+    void showTextSearch();
+    void updateBrowserFont();
+    void updateUserInterface();
+
+signals:
+    void currentViewerChanged();
+    void copyAvailable(bool yes);
+    void sourceChanged(const QUrl &url);
+    void highlighted(const QString &link);
+    void forwardAvailable(bool available);
+    void backwardAvailable(bool available);
+    void addBookmark(const QString &title, const QString &url);
+
+protected:
+    void keyPressEvent(QKeyEvent *);
+    void focusInEvent(QFocusEvent *event);
+
+private slots:
+    void highlightSearchTerms();
+    void printPreview(QPrinter *printer);
+    void handleSourceChanged(const QUrl &url);
+
+private:
+    void initPrinter();
+    void connectSignals(HelpViewer *page);
+    bool eventFilter(QObject *object, QEvent *e);
+
+private:
+#ifndef QT_NO_PRINTER
+    QPrinter *m_printer;
+#endif
+    FindWidget *m_findWidget;
+    QStackedWidget *m_stackedWidget;
+    TabBar *m_tabBar;
+};
+
+QT_END_NAMESPACE
+
+#endif  // CENTRALWIDGET_H