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diff --git a/src/designer/src/designer/mainwindow.h b/src/designer/src/designer/mainwindow.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 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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef MAINWINDOW_H
+#define MAINWINDOW_H
+
+#include <QtGui/QMainWindow>
+#include <QtCore/QList>
+#include <QtGui/QMdiArea>
+
+QT_BEGIN_NAMESPACE
+
+class QDesignerActions;
+class QDesignerWorkbench;
+class QDesignerToolWindow;
+class QDesignerFormWindow;
+class QDesignerSettings;
+
+class QtToolBarManager;
+class QToolBar;
+class QMdiArea;
+class QMenu;
+class QByteArray;
+class QMimeData;
+
+/* A main window that has a configureable policy on handling close events. If
+ * enabled, it can forward the close event to external handlers.
+ * Base class for windows that can switch roles between tool windows
+ * and main windows. */
+
+class MainWindowBase: public QMainWindow
+{
+    Q_DISABLE_COPY(MainWindowBase)
+    Q_OBJECT
+protected:
+    explicit MainWindowBase(QWidget *parent = 0, Qt::WindowFlags flags = Qt::Window);
+
+public:
+    enum CloseEventPolicy {
+        /* Always accept close events */
+        AcceptCloseEvents,
+        /* Emit a signal with the event, have it handled elsewhere */
+        EmitCloseEventSignal };
+
+    CloseEventPolicy closeEventPolicy() const { return m_policy; }
+    void setCloseEventPolicy(CloseEventPolicy pol) { m_policy = pol; }
+
+    static QList<QToolBar *> createToolBars(const QDesignerActions *actions, bool singleToolBar);
+    static QString mainWindowTitle();
+
+    // Use the minor Qt version as settings versions to avoid conflicts
+    static int settingsVersion();
+
+signals:
+    void closeEventReceived(QCloseEvent *e);
+
+protected:
+    virtual void closeEvent(QCloseEvent *e);
+private:
+    CloseEventPolicy m_policy;
+};
+
+/* An MdiArea that listens for desktop file manager file drop events and emits
+ * a signal to open a dropped file. */
+class DockedMdiArea : public QMdiArea
+{
+    Q_DISABLE_COPY(DockedMdiArea)
+    Q_OBJECT
+public:
+    explicit DockedMdiArea(const QString &extension, QWidget *parent = 0);
+
+signals:
+    void fileDropped(const QString &);
+
+protected:
+    bool event (QEvent *event);
+
+private:
+    QStringList uiFiles(const QMimeData *d) const;
+
+    const QString m_extension;
+};
+
+// Convenience class that manages a QtToolBarManager and an action to trigger
+// it on a mainwindow.
+class ToolBarManager : public QObject
+{
+    Q_OBJECT
+    Q_DISABLE_COPY(ToolBarManager)
+public:
+    explicit ToolBarManager(QMainWindow *configureableMainWindow,
+                            QWidget *parent,
+                            QMenu *toolBarMenu,
+                            const QDesignerActions *actions,
+                            const QList<QToolBar *> &toolbars,
+                            const QList<QDesignerToolWindow*> &toolWindows);
+
+    QByteArray saveState(int version = 0) const;
+    bool restoreState(const QByteArray &state, int version = 0);
+
+private slots:
+    void configureToolBars();
+    void updateToolBarMenu();
+
+private:
+    QMainWindow *m_configureableMainWindow;
+    QWidget *m_parent;
+    QMenu *m_toolBarMenu;
+    QtToolBarManager *m_manager;
+    QAction *m_configureAction;
+    QList<QToolBar *> m_toolbars;
+};
+
+/* Main window to be used for docked mode */
+class DockedMainWindow : public MainWindowBase {
+    Q_OBJECT
+    Q_DISABLE_COPY(DockedMainWindow)
+public:
+    typedef QList<QDesignerToolWindow*> DesignerToolWindowList;
+    typedef QList<QDockWidget *> DockWidgetList;
+
+    explicit DockedMainWindow(QDesignerWorkbench *wb,
+                              QMenu *toolBarMenu,
+                              const DesignerToolWindowList &toolWindows);
+
+    // Create a MDI subwindow for the form.
+    QMdiSubWindow *createMdiSubWindow(QWidget *fw, Qt::WindowFlags f, const QKeySequence &designerCloseActionShortCut);
+
+    QMdiArea *mdiArea() const;
+
+    DockWidgetList addToolWindows(const DesignerToolWindowList &toolWindows);
+
+    void restoreSettings(const QDesignerSettings &s, const DockWidgetList &dws, const QRect &desktopArea);
+    void saveSettings(QDesignerSettings &) const;
+
+signals:
+    void fileDropped(const QString &);
+    void formWindowActivated(QDesignerFormWindow *);
+
+private slots:
+    void slotSubWindowActivated(QMdiSubWindow*);
+
+private:
+    ToolBarManager *m_toolBarManager;
+};
+
+QT_END_NAMESPACE
+
+#endif // MAINWINDOW_H