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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 DEFAULT_CONTAINER_H
+#define DEFAULT_CONTAINER_H
+
+#include <QtDesigner/QDesignerContainerExtension>
+#include <QtDesigner/extension.h>
+#include <extensionfactory_p.h>
+
+#include <QtGui/QStackedWidget>
+#include <QtGui/QTabWidget>
+#include <QtGui/QToolBox>
+#include <QtGui/QScrollArea>
+#include <QtGui/QDockWidget>
+
+QT_BEGIN_NAMESPACE
+
+namespace qdesigner_internal {
+
+// ------------ QStackedWidgetContainer
+class QStackedWidgetContainer: public QObject, public QDesignerContainerExtension
+{
+    Q_OBJECT
+    Q_INTERFACES(QDesignerContainerExtension)
+public:
+    explicit QStackedWidgetContainer(QStackedWidget *widget, QObject *parent = 0);
+
+    virtual int count() const { return m_widget->count(); }
+    virtual QWidget *widget(int index) const { return m_widget->widget(index); }
+
+    virtual int currentIndex() const { return m_widget->currentIndex(); }
+    virtual void setCurrentIndex(int index);
+
+    virtual void addWidget(QWidget *widget);
+    virtual void insertWidget(int index, QWidget *widget);
+    virtual void remove(int index);
+
+private:
+    QStackedWidget *m_widget;
+};
+
+// ------------ QTabWidgetContainer
+class QTabWidgetContainer: public QObject, public QDesignerContainerExtension
+{
+    Q_OBJECT
+    Q_INTERFACES(QDesignerContainerExtension)
+public:
+    explicit QTabWidgetContainer(QTabWidget *widget, QObject *parent = 0);
+
+    virtual int count() const { return m_widget->count(); }
+    virtual QWidget *widget(int index) const { return m_widget->widget(index); }
+
+    virtual int currentIndex() const { return m_widget->currentIndex(); }
+    virtual void setCurrentIndex(int index);
+
+    virtual void addWidget(QWidget *widget);
+    virtual void insertWidget(int index, QWidget *widget);
+    virtual void remove(int index);
+
+private:
+    QTabWidget *m_widget;
+};
+
+// ------------  QToolBoxContainer
+class QToolBoxContainer: public QObject, public QDesignerContainerExtension
+{
+    Q_OBJECT
+    Q_INTERFACES(QDesignerContainerExtension)
+public:
+    explicit QToolBoxContainer(QToolBox *widget, QObject *parent = 0);
+
+    virtual int count() const { return m_widget->count(); }
+    virtual QWidget *widget(int index) const { return m_widget->widget(index); }
+
+    virtual int currentIndex() const { return m_widget->currentIndex(); }
+    virtual void setCurrentIndex(int index);
+
+    virtual void addWidget(QWidget *widget);
+    virtual void insertWidget(int index, QWidget *widget);
+    virtual void remove(int index);
+
+private:
+    QToolBox *m_widget;
+};
+
+// ------------ SingleChildContainer:
+//  Template for containers that have a single child widget using widget()/setWidget().
+
+template <class Container>
+class SingleChildContainer: public QDesignerContainerExtension
+{
+protected:
+    explicit SingleChildContainer(Container *widget, bool active = true);
+public:
+    virtual int count() const;
+    virtual QWidget *widget(int index) const;
+    virtual int currentIndex() const;
+    virtual void setCurrentIndex(int /*index*/) {}
+    virtual void addWidget(QWidget *widget);
+    virtual void insertWidget(int index, QWidget *widget);
+    virtual void remove(int /*index*/) {}
+
+private:
+    const bool m_active;
+    Container *m_container;
+};
+
+template <class Container>
+SingleChildContainer<Container>::SingleChildContainer(Container *widget, bool active) :
+    m_active(active),
+    m_container(widget)
+{
+}
+
+template <class Container>
+int SingleChildContainer<Container>::count() const
+{
+    return  m_active && m_container->widget() ? 1 : 0;
+}
+
+template <class Container>
+QWidget *SingleChildContainer<Container>::widget(int /* index */) const
+{
+    return m_container->widget();
+}
+
+template <class Container>
+int SingleChildContainer<Container>::currentIndex() const
+{
+    return m_active && m_container->widget() ? 0 : -1;
+}
+
+template <class Container>
+void SingleChildContainer<Container>::addWidget(QWidget *widget)
+{
+    Q_ASSERT(m_container->widget() == 0);
+    widget->setParent(m_container);
+    m_container->setWidget(widget);
+}
+
+template <class Container>
+void SingleChildContainer<Container>::insertWidget(int /* index */, QWidget *widget)
+{
+    addWidget(widget);
+}
+
+// ------------  QScrollAreaContainer
+class QScrollAreaContainer: public QObject, public SingleChildContainer<QScrollArea>
+{
+    Q_OBJECT
+    Q_INTERFACES(QDesignerContainerExtension)
+public:
+    explicit QScrollAreaContainer(QScrollArea *widget, QObject *parent = 0);
+};
+
+// --------------- QDockWidgetContainer
+class QDockWidgetContainer: public QObject, public SingleChildContainer<QDockWidget>
+{
+    Q_OBJECT
+    Q_INTERFACES(QDesignerContainerExtension)
+public:
+    explicit QDockWidgetContainer(QDockWidget *widget, QObject *parent = 0);
+};
+
+typedef ExtensionFactory<QDesignerContainerExtension, QStackedWidget, QStackedWidgetContainer> QDesignerStackedWidgetContainerFactory;
+typedef ExtensionFactory<QDesignerContainerExtension, QTabWidget, QTabWidgetContainer> QDesignerTabWidgetContainerFactory;
+typedef ExtensionFactory<QDesignerContainerExtension, QToolBox, QToolBoxContainer> QDesignerToolBoxContainerFactory;
+typedef ExtensionFactory<QDesignerContainerExtension, QScrollArea, QScrollAreaContainer> QScrollAreaContainerFactory;
+typedef ExtensionFactory<QDesignerContainerExtension,  QDockWidget, QDockWidgetContainer> QDockWidgetContainerFactory;
+}  // namespace qdesigner_internal
+
+QT_END_NAMESPACE
+
+#endif // DEFAULT_CONTAINER_H