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diff --git a/examples/pdf/pdfviewer/sequentialpagewidget.h b/examples/pdf/pdfviewer/sequentialpagewidget.h
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+/****************************************************************************
+**
+** Copyright (C) 2016 The Qt Company Ltd.
+** Contact: http://www.qt.io/licensing/
+**
+** This file is part of the QtPDF module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL3$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see http://www.qt.io/terms-conditions. For further
+** information use the contact form at http://www.qt.io/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 3 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPLv3 included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 3 requirements
+** will be met: https://www.gnu.org/licenses/lgpl.html.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 2.0 or later 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 2.0 requirements will be
+** met: http://www.gnu.org/licenses/gpl-2.0.html.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef SEQUENTIALPAGEWIDGET_H
+#define SEQUENTIALPAGEWIDGET_H
+
+#include <QWidget>
+
+class QPdfDocument;
+class PageRenderer;
+
+class SequentialPageWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit SequentialPageWidget(QWidget *parent = 0);
+    ~SequentialPageWidget();
+
+    void paintEvent(QPaintEvent * event);
+    qreal zoom() { return m_zoom; }
+    qreal yForPage(int page);
+    int topPageShowing() { return m_topPageShowing; }
+    int bottomPageShowing() { return m_bottomPageShowing; }
+
+    void setDocument(QPdfDocument *document);
+
+public slots:
+    void setZoom(qreal factor);
+    void invalidate();
+
+signals:
+    void showingPageRange(int start, int end);
+    void zoomChanged(qreal factor);
+
+private slots:
+    void documentStatusChanged();
+    void pageLoaded(int page, qreal zoom, QImage image);
+
+private:
+    int pageCount();
+    QSizeF pageSize(int page);
+    void render(int page);
+
+private:
+    QHash<int, QImage> m_pageCache;
+    QVector<int> m_cachedPagesLRU;
+    int m_pageCacheLimit;
+    QVector<QSizeF> m_pageSizes;
+    PageRenderer *m_pageRenderer;
+    QBrush m_background;
+    QPixmap m_placeholderIcon;
+    QBrush m_placeholderBackground;
+    int m_pageSpacing;
+    int m_topPageShowing;
+    int m_bottomPageShowing;
+    QSize m_totalSize;
+    qreal m_zoom;
+    qreal m_screenResolution; // pixels per point
+
+    QPdfDocument *m_document;
+};
+
+#endif // SEQUENTIALPAGEWIDGET_H