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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.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+//  W A R N I N G
+//  -------------
+//
+// This file is not part of the Qt API.  It exists for the convenience
+// of Qt Designer.  This header
+// file may change from version to version without notice, or even be removed.
+//
+// We mean it.
+//
+
+#ifndef DESIGNERWIDGETITEM_H
+#define DESIGNERWIDGETITEM_H
+
+#include "shared_global_p.h"
+
+#include <QtGui/QLayoutItem>
+#include <QtCore/QObject>
+
+QT_BEGIN_NAMESPACE
+
+class QDesignerFormEditorInterface;
+
+namespace qdesigner_internal {
+
+// QDesignerWidgetItem: A Layout Item that is used for non-containerextension-
+// containers (QFrame, etc) on Designer forms. It prevents its widget
+// from being slammed to size 0 if the widget has no layout:
+// Pre 4.5, this item ensured only that QWidgets and QFrames were not squeezed
+// to size 0 since they have an invalid size hint when non-laid out.
+// Since 4.5, the item is used for every  non-containerextension-container.
+// In case the container has itself a layout, it merely tracks the minimum
+// size. If the container has no layout and is not subject to some stretch
+// factor, it will return the last valid size. The effect is that after
+// breaking a layout on a container within a layout, it just maintains its
+// last size and is not slammed to 0,0. In addition, it can be resized.
+// The class keeps track of the containing layout by tracking widget reparent
+// and destroyed slots as Designer will for example re-create grid layouts to
+// shrink them.
+
+class QDESIGNER_SHARED_EXPORT QDesignerWidgetItem : public QObject, public QWidgetItemV2  {
+    Q_DISABLE_COPY(QDesignerWidgetItem)
+    Q_OBJECT
+public:
+    explicit QDesignerWidgetItem(const QLayout *containingLayout, QWidget *w, Qt::Orientations o = Qt::Horizontal|Qt::Vertical);
+
+    const QLayout *containingLayout() const;
+
+    inline QWidget *constWidget() const { return const_cast<QDesignerWidgetItem*>(this)->widget(); }
+
+    virtual QSize minimumSize() const;
+    virtual QSize sizeHint()    const;
+
+    // Resize: Takes effect if the contained widget does not have a layout
+    QSize nonLaidOutMinSize() const;
+    void setNonLaidOutMinSize(const QSize &s);
+
+    QSize nonLaidOutSizeHint() const;
+    void setNonLaidOutSizeHint(const QSize &s);
+
+    // Check whether a QDesignerWidgetItem should be installed
+    static bool check(const QLayout *layout, QWidget *w, Qt::Orientations *ptrToOrientations = 0);
+
+    // Register itself using QLayoutPrivate's widget item factory method hook
+    static void install();
+    static void deinstall();
+
+    // Check for a non-container extension container
+    static bool isContainer(const QDesignerFormEditorInterface *core, QWidget *w);
+
+    static bool subjectToStretch(const QLayout *layout, QWidget *w);
+
+    virtual bool eventFilter(QObject * watched, QEvent * event);
+
+private slots:
+    void layoutChanged();
+
+private:
+    void expand(QSize *s) const;
+    bool subjectToStretch() const;
+
+    const Qt::Orientations m_orientations;
+    mutable QSize m_nonLaidOutMinSize;
+    mutable QSize m_nonLaidOutSizeHint;
+    mutable const QLayout *m_cachedContainingLayout;
+};
+
+// Helper class that ensures QDesignerWidgetItem is installed while an
+// instance is in scope.
+
+class QDESIGNER_SHARED_EXPORT QDesignerWidgetItemInstaller {
+    Q_DISABLE_COPY(QDesignerWidgetItemInstaller)
+
+public:
+    QDesignerWidgetItemInstaller();
+    ~QDesignerWidgetItemInstaller();
+
+private:
+    static int m_instanceCount;
+};
+
+} // namespace qdesigner_internal
+
+QT_END_NAMESPACE
+
+#endif