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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 Designer 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of Qt Designer.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef ZOOMWIDGET_H
+#define ZOOMWIDGET_H
+
+#include "shared_global_p.h"
+
+#include <QtGui/QGraphicsView>
+#include <QtGui/QGraphicsProxyWidget>
+#include <QtCore/QList>
+
+QT_BEGIN_NAMESPACE
+
+class QGraphicsScene;
+class QMenu;
+class QAction;
+class QActionGroup;
+
+namespace qdesigner_internal {
+
+// A checkable zoom menu action group. Operates in percent.
+
+class QDESIGNER_SHARED_EXPORT ZoomMenu : public QObject {
+    Q_OBJECT
+    Q_DISABLE_COPY(ZoomMenu)
+
+public:
+    ZoomMenu(QObject *parent = 0);
+    void addActions(QMenu *m);
+
+    int zoom() const;
+
+    // Return a list of available zoom values.
+    static QList<int> zoomValues();
+
+public slots:
+    void setZoom(int percent);
+
+signals:
+    void zoomChanged(int);
+
+private slots:
+    void slotZoomMenu(QAction *);
+
+private:
+    static int zoomOf(const QAction *a);
+
+    QActionGroup *m_menuActions;
+};
+
+/* Zoom view: A QGraphicsView with a zoom menu */
+
+class QDESIGNER_SHARED_EXPORT ZoomView : public QGraphicsView
+{
+    Q_PROPERTY(int zoom READ zoom WRITE setZoom DESIGNABLE true SCRIPTABLE true)
+    Q_PROPERTY(bool zoomContextMenuEnabled READ isZoomContextMenuEnabled WRITE setZoomContextMenuEnabled DESIGNABLE true SCRIPTABLE true)
+    Q_OBJECT
+    Q_DISABLE_COPY(ZoomView)
+public:
+    ZoomView(QWidget *parent = 0);
+
+    /*  Zoom in percent (for easily implementing menus) and qreal zoomFactor
+     * in sync */
+    int zoom() const; // in percent
+    qreal zoomFactor() const;
+
+    // Zoom Menu on QGraphicsView.
+    bool isZoomContextMenuEnabled() const;
+    void setZoomContextMenuEnabled(bool e);
+
+    QGraphicsScene &scene() { return *m_scene; }
+    const QGraphicsScene &scene() const { return *m_scene; }
+
+    // Helpers for menu
+    ZoomMenu *zoomMenu();
+
+    QPoint scrollPosition() const;
+    void setScrollPosition(const QPoint& pos);
+    void scrollToOrigin();
+
+public slots:
+    void setZoom(int percent);
+    void showContextMenu(const QPoint &globalPos);
+
+protected:
+    void contextMenuEvent(QContextMenuEvent *event);
+
+    // Overwrite for implementing additional behaviour when doing setZoom();
+    virtual void applyZoom();
+
+private:
+    QGraphicsScene *m_scene;
+    int m_zoom;
+    qreal m_zoomFactor;
+
+    bool m_zoomContextMenuEnabled;    
+    bool m_resizeBlocked;
+    ZoomMenu *m_zoomMenu;
+};
+
+/* The proxy widget used in  ZoomWidget. It  refuses to move away from 0,0,
+ * This behaviour is required for Windows only. */
+
+class  QDESIGNER_SHARED_EXPORT ZoomProxyWidget : public QGraphicsProxyWidget {
+    Q_DISABLE_COPY(ZoomProxyWidget)
+public:
+    explicit ZoomProxyWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0);
+
+protected:
+    virtual QVariant itemChange(GraphicsItemChange change, const QVariant &value);
+};
+
+/* Zoom widget: A QGraphicsView-based container for a widget that allows for
+ * zooming it. Communicates changes in size in the following ways:
+ * 1) Embedded widget wants to resize: Listen for its resize in event filter
+ *    and resize
+ * 2) Zoom is changed: resize to fully display the embedded widget
+ * 3) Outer widget changes (by manually resizing the window:
+ *    Pass the scaled change on to the embedded widget.
+ * Provides helper functions for a zoom context menu on the widget. */
+
+class QDESIGNER_SHARED_EXPORT ZoomWidget : public ZoomView
+{
+    Q_PROPERTY(bool widgetZoomContextMenuEnabled READ isWidgetZoomContextMenuEnabled WRITE setWidgetZoomContextMenuEnabled DESIGNABLE true SCRIPTABLE true)
+    Q_PROPERTY(bool itemAcceptDrops READ itemAcceptDrops WRITE setItemAcceptDrops DESIGNABLE true SCRIPTABLE true)
+    Q_OBJECT
+    Q_DISABLE_COPY(ZoomWidget)
+
+public:
+    ZoomWidget(QWidget *parent = 0);
+    void setWidget(QWidget *w, Qt::WindowFlags wFlags = 0);
+
+    const QGraphicsProxyWidget *proxy() const { return m_proxy; }
+    QGraphicsProxyWidget *proxy() { return m_proxy; }
+
+    /* Enable the zoom Menu on the Widget (as opposed ZoomView's menu which
+     * is on the canvas). */
+    bool isWidgetZoomContextMenuEnabled() const;
+    void setWidgetZoomContextMenuEnabled(bool e);
+
+    void setItemAcceptDrops(bool);
+    bool itemAcceptDrops() const;
+
+    virtual QSize minimumSizeHint() const;
+    virtual QSize sizeHint() const;
+
+    bool zoomedEventFilter(QObject *watched, QEvent *event);
+
+public slots:
+    // debug state
+    void dump() const;
+
+protected:
+    void resizeEvent(QResizeEvent * event);
+
+    // Overwritten from ZoomView
+    virtual void applyZoom();
+    // Overwrite to actually perform a resize. This is required if we are in a layout. Default does resize().
+    virtual void doResize(const QSize &s);
+
+private:
+    // Factory function for QGraphicsProxyWidgets which can be overwritten. Default creates a ZoomProxyWidget
+    virtual QGraphicsProxyWidget *createProxyWidget(QGraphicsItem *parent = 0, Qt::WindowFlags wFlags = 0) const;
+    QSize widgetSizeToViewSize(const QSize &s, bool *ptrToValid = 0) const;
+
+    void resizeToWidgetSize();
+    QSize viewPortMargin() const;
+    QSize widgetSize() const;
+    QSizeF widgetDecorationSizeF() const;
+
+    QGraphicsProxyWidget *m_proxy;
+    bool m_viewResizeBlocked;
+    bool m_widgetResizeBlocked;
+    bool m_widgetZoomContextMenuEnabled;
+};
+
+} // namespace qdesigner_internal
+
+QT_END_NAMESPACE
+
+#endif