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diff --git a/tools/designer/src/lib/shared/qdesigner_dockwidget.cpp b/tools/designer/src/lib/shared/qdesigner_dockwidget.cpp
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+++ b/tools/designer/src/lib/shared/qdesigner_dockwidget.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (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 either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** 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 1.0, 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.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qdesigner_dockwidget_p.h"
+#include "layoutinfo_p.h"
+
+#include <QtDesigner/QDesignerFormWindowInterface>
+#include <QtDesigner/QDesignerFormEditorInterface>
+#include <QtDesigner/QDesignerContainerExtension>
+#include <QtDesigner/QExtensionManager>
+#include <QtDesigner/QDesignerFormWindowCursorInterface>
+
+#include <QtGui/QMainWindow>
+#include <QtGui/QLayout>
+
+QT_BEGIN_NAMESPACE
+
+QDesignerDockWidget::QDesignerDockWidget(QWidget *parent)
+    : QDockWidget(parent)
+{
+}
+
+QDesignerDockWidget::~QDesignerDockWidget()
+{
+}
+
+bool QDesignerDockWidget::docked() const
+{
+    return qobject_cast<QMainWindow*>(parentWidget()) != 0;
+}
+
+void QDesignerDockWidget::setDocked(bool b)
+{
+    if (QMainWindow *mainWindow = findMainWindow()) {
+        QDesignerFormEditorInterface *core = formWindow()->core();
+        QDesignerContainerExtension *c;
+        c = qt_extension<QDesignerContainerExtension*>(core->extensionManager(), mainWindow);
+        if (b && !docked()) {
+            // Dock it
+            // ### undo/redo stack
+            setParent(0);
+            c->addWidget(this);
+            formWindow()->selectWidget(this, formWindow()->cursor()->isWidgetSelected(this));
+        } else if (!b && docked()) {
+            // Undock it
+            for (int i = 0; i < c->count(); ++i) {
+                if (c->widget(i) == this) {
+                    c->remove(i);
+                    break;
+                }
+            }
+            // #### restore the position
+            setParent(mainWindow->centralWidget());
+            show();
+            formWindow()->selectWidget(this, formWindow()->cursor()->isWidgetSelected(this));
+        }
+    }
+}
+
+Qt::DockWidgetArea QDesignerDockWidget::dockWidgetArea() const
+{
+    if (QMainWindow *mainWindow = qobject_cast<QMainWindow*>(parentWidget()))
+        return mainWindow->dockWidgetArea(const_cast<QDesignerDockWidget*>(this));
+
+    return Qt::LeftDockWidgetArea;
+}
+
+void QDesignerDockWidget::setDockWidgetArea(Qt::DockWidgetArea dockWidgetArea)
+{
+    if (QMainWindow *mainWindow = qobject_cast<QMainWindow*>(parentWidget())) {
+        if ((dockWidgetArea != Qt::NoDockWidgetArea)
+            && isAreaAllowed(dockWidgetArea)) {
+            mainWindow->addDockWidget(dockWidgetArea, this);
+        }
+    }
+}
+
+bool QDesignerDockWidget::inMainWindow() const
+{
+    QMainWindow *mw = findMainWindow();
+    if (mw && !mw->centralWidget()->layout()) {
+        if (mw == parentWidget())
+            return true;
+        if (mw->centralWidget() == parentWidget())
+            return true;
+    }
+    return false;
+}
+
+QDesignerFormWindowInterface *QDesignerDockWidget::formWindow() const
+{
+    return QDesignerFormWindowInterface::findFormWindow(const_cast<QDesignerDockWidget*>(this));
+}
+
+QMainWindow *QDesignerDockWidget::findMainWindow() const
+{
+    if (QDesignerFormWindowInterface *fw = formWindow())
+        return qobject_cast<QMainWindow*>(fw->mainContainer());
+    return 0;
+}
+
+QT_END_NAMESPACE