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diff --git a/src/gui/widgets/qmdisubwindow.h b/src/gui/widgets/qmdisubwindow.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 QtGui module 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 QMDISUBWINDOW_H
+#define QMDISUBWINDOW_H
+
+#include <QtGui/qwidget.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#ifndef QT_NO_MDIAREA
+
+class QMenu;
+class QMdiArea;
+
+namespace QMdi { class ControlContainer; }
+class QMdiSubWindowPrivate;
+class Q_GUI_EXPORT QMdiSubWindow : public QWidget
+{
+    Q_OBJECT
+    Q_PROPERTY(int keyboardSingleStep READ keyboardSingleStep WRITE setKeyboardSingleStep)
+    Q_PROPERTY(int keyboardPageStep READ keyboardPageStep WRITE setKeyboardPageStep)
+public:
+    enum SubWindowOption {
+        AllowOutsideAreaHorizontally = 0x1, // internal
+        AllowOutsideAreaVertically = 0x2, // internal
+        RubberBandResize = 0x4,
+        RubberBandMove = 0x8
+    };
+    Q_DECLARE_FLAGS(SubWindowOptions, SubWindowOption)
+
+    QMdiSubWindow(QWidget *parent = 0, Qt::WindowFlags flags = 0);
+    ~QMdiSubWindow();
+
+    QSize sizeHint() const;
+    QSize minimumSizeHint() const;
+
+    void setWidget(QWidget *widget);
+    QWidget *widget() const;
+
+    QWidget *maximizedButtonsWidget() const; // internal
+    QWidget *maximizedSystemMenuIconWidget() const; // internal
+
+    bool isShaded() const;
+
+    void setOption(SubWindowOption option, bool on = true);
+    bool testOption(SubWindowOption) const;
+
+    void setKeyboardSingleStep(int step);
+    int keyboardSingleStep() const;
+
+    void setKeyboardPageStep(int step);
+    int keyboardPageStep() const;
+
+#ifndef QT_NO_MENU
+    void setSystemMenu(QMenu *systemMenu);
+    QMenu *systemMenu() const;
+#endif
+
+    QMdiArea *mdiArea() const;
+
+Q_SIGNALS:
+    void windowStateChanged(Qt::WindowStates oldState, Qt::WindowStates newState);
+    void aboutToActivate();
+
+public Q_SLOTS:
+#ifndef QT_NO_MENU
+    void showSystemMenu();
+#endif
+    void showShaded();
+
+protected:
+    bool eventFilter(QObject *object, QEvent *event);
+    bool event(QEvent *event);
+    void showEvent(QShowEvent *showEvent);
+    void hideEvent(QHideEvent *hideEvent);
+    void changeEvent(QEvent *changeEvent);
+    void closeEvent(QCloseEvent *closeEvent);
+    void leaveEvent(QEvent *leaveEvent);
+    void resizeEvent(QResizeEvent *resizeEvent);
+    void timerEvent(QTimerEvent *timerEvent);
+    void moveEvent(QMoveEvent *moveEvent);
+    void paintEvent(QPaintEvent *paintEvent);
+    void mousePressEvent(QMouseEvent *mouseEvent);
+    void mouseDoubleClickEvent(QMouseEvent *mouseEvent);
+    void mouseReleaseEvent(QMouseEvent *mouseEvent);
+    void mouseMoveEvent(QMouseEvent *mouseEvent);
+    void keyPressEvent(QKeyEvent *keyEvent);
+#ifndef QT_NO_CONTEXTMENU
+    void contextMenuEvent(QContextMenuEvent *contextMenuEvent);
+#endif
+    void focusInEvent(QFocusEvent *focusInEvent);
+    void focusOutEvent(QFocusEvent *focusOutEvent);
+    void childEvent(QChildEvent *childEvent);
+
+private:
+    Q_DISABLE_COPY(QMdiSubWindow)
+    Q_DECLARE_PRIVATE(QMdiSubWindow)
+    Q_PRIVATE_SLOT(d_func(), void _q_updateStaysOnTopHint())
+    Q_PRIVATE_SLOT(d_func(), void _q_enterInteractiveMode())
+    Q_PRIVATE_SLOT(d_func(), void _q_processFocusChanged(QWidget *, QWidget *))
+    friend class QMdiAreaPrivate;
+#ifndef QT_NO_TABBAR
+    friend class QMdiAreaTabBar;
+#endif
+    friend class QMdi::ControlContainer;
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QMdiSubWindow::SubWindowOptions)
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QT_NO_MDIAREA
+
+#endif // QMDISUBWINDOW_H