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diff --git a/src/widgets/widgets/qmdiarea.h b/src/widgets/widgets/qmdiarea.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.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 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 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QMDIAREA_H
+#define QMDIAREA_H
+
+#include <QtWidgets/qabstractscrollarea.h>
+#include <QtWidgets/qtabwidget.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+QT_MODULE(Gui)
+
+#ifndef QT_NO_MDIAREA
+
+class QMdiSubWindow;
+
+class QMdiAreaPrivate;
+class Q_GUI_EXPORT QMdiArea : public QAbstractScrollArea
+{
+    Q_OBJECT
+    Q_ENUMS(ViewMode)
+    Q_PROPERTY(QBrush background READ background WRITE setBackground)
+    Q_PROPERTY(WindowOrder activationOrder READ activationOrder WRITE setActivationOrder)
+    Q_PROPERTY(ViewMode viewMode READ viewMode WRITE setViewMode)
+#ifndef QT_NO_TABBAR
+    Q_PROPERTY(bool documentMode READ documentMode WRITE setDocumentMode)
+    Q_PROPERTY(bool tabsClosable READ tabsClosable WRITE setTabsClosable)
+    Q_PROPERTY(bool tabsMovable READ tabsMovable WRITE setTabsMovable)
+#endif
+#ifndef QT_NO_TABWIDGET
+    Q_PROPERTY(QTabWidget::TabShape tabShape READ tabShape WRITE setTabShape)
+    Q_PROPERTY(QTabWidget::TabPosition tabPosition READ tabPosition WRITE setTabPosition)
+#endif
+    Q_ENUMS(WindowOrder)
+public:
+    enum AreaOption {
+        DontMaximizeSubWindowOnActivation = 0x1
+    };
+    Q_DECLARE_FLAGS(AreaOptions, AreaOption)
+
+    enum WindowOrder {
+        CreationOrder,
+        StackingOrder,
+        ActivationHistoryOrder
+    };
+
+    enum ViewMode {
+        SubWindowView,
+        TabbedView
+    };
+
+    QMdiArea(QWidget *parent = 0);
+    ~QMdiArea();
+
+    QSize sizeHint() const;
+    QSize minimumSizeHint() const;
+
+    QMdiSubWindow *currentSubWindow() const;
+    QMdiSubWindow *activeSubWindow() const;
+    QList<QMdiSubWindow *> subWindowList(WindowOrder order = CreationOrder) const;
+
+    QMdiSubWindow *addSubWindow(QWidget *widget, Qt::WindowFlags flags = 0);
+    void removeSubWindow(QWidget *widget);
+
+    QBrush background() const;
+    void setBackground(const QBrush &background);
+
+    WindowOrder activationOrder() const;
+    void setActivationOrder(WindowOrder order);
+
+    void setOption(AreaOption option, bool on = true);
+    bool testOption(AreaOption opton) const;
+
+    void setViewMode(ViewMode mode);
+    ViewMode viewMode() const;
+
+#ifndef QT_NO_TABBAR
+    bool documentMode() const;
+    void setDocumentMode(bool enabled);
+
+    void setTabsClosable(bool closable);
+    bool tabsClosable() const;
+
+    void setTabsMovable(bool movable);
+    bool tabsMovable() const;
+#endif
+#ifndef QT_NO_TABWIDGET
+    void setTabShape(QTabWidget::TabShape shape);
+    QTabWidget::TabShape tabShape() const;
+
+    void setTabPosition(QTabWidget::TabPosition position);
+    QTabWidget::TabPosition tabPosition() const;
+#endif
+
+Q_SIGNALS:
+    void subWindowActivated(QMdiSubWindow *);
+
+public Q_SLOTS:
+    void setActiveSubWindow(QMdiSubWindow *window);
+    void tileSubWindows();
+    void cascadeSubWindows();
+    void closeActiveSubWindow();
+    void closeAllSubWindows();
+    void activateNextSubWindow();
+    void activatePreviousSubWindow();
+
+protected Q_SLOTS:
+    void setupViewport(QWidget *viewport);
+
+protected:
+    bool event(QEvent *event);
+    bool eventFilter(QObject *object, QEvent *event);
+    void paintEvent(QPaintEvent *paintEvent);
+    void childEvent(QChildEvent *childEvent);
+    void resizeEvent(QResizeEvent *resizeEvent);
+    void timerEvent(QTimerEvent *timerEvent);
+    void showEvent(QShowEvent *showEvent);
+    bool viewportEvent(QEvent *event);
+    void scrollContentsBy(int dx, int dy);
+
+private:
+    Q_DISABLE_COPY(QMdiArea)
+    Q_DECLARE_PRIVATE(QMdiArea)
+    Q_PRIVATE_SLOT(d_func(), void _q_deactivateAllWindows())
+    Q_PRIVATE_SLOT(d_func(), void _q_processWindowStateChanged(Qt::WindowStates, Qt::WindowStates))
+    Q_PRIVATE_SLOT(d_func(), void _q_currentTabChanged(int))
+    Q_PRIVATE_SLOT(d_func(), void _q_closeTab(int))
+    Q_PRIVATE_SLOT(d_func(), void _q_moveTab(int, int))
+};
+
+Q_DECLARE_OPERATORS_FOR_FLAGS(QMdiArea::AreaOptions)
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif // QT_NO_MDIAREA
+#endif // QMDIAREA_H