/****************************************************************************

**

** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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** Contact: Nokia Corporation (qt-info@nokia.com)

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** This file is part of the Qt Designer of the Qt Toolkit.

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** This file contains pre-release code and may not be distributed.

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** contained in the Technology Preview License Agreement accompanying

** this package.

**

** GNU Lesser General Public License Usage

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** 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

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** $QT_END_LICENSE$

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****************************************************************************/

//

//  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 LAYOUT_H

#define LAYOUT_H

#include "shared_global_p.h"

#include "layoutinfo_p.h"

#include <QtCore/QPointer>

#include <QtCore/QObject>

#include <QtCore/QMap>

#include <QtCore/QHash>

#include <QtGui/QLayout>

#include <QtGui/QGridLayout>

#include <QtGui/QWidget>

QT_BEGIN_NAMESPACE

class QDesignerFormWindowInterface;

namespace qdesigner_internal {

class QDESIGNER_SHARED_EXPORT Layout : public QObject

{

    Q_OBJECT

    Q_DISABLE_COPY(Layout)

protected:

    Layout(const QWidgetList &wl, QWidget *p, QDesignerFormWindowInterface *fw, QWidget *lb, LayoutInfo::Type layoutType);

public:

    static  Layout* createLayout(const QWidgetList &widgets,  QWidget *parentWidget,

                                 QDesignerFormWindowInterface *fw,

                                 QWidget *layoutBase, LayoutInfo::Type layoutType);

    virtual ~Layout();

    virtual void sort() = 0;

    virtual void doLayout() = 0;

    virtual void setup();

    virtual void undoLayout();

    virtual void breakLayout();

    const QWidgetList &widgets() const { return m_widgets; }

    QWidget *parentWidget() const      { return m_parentWidget; }

    QWidget *layoutBaseWidget() const  { return m_layoutBase; }

    /* Determines whether instances of QLayoutWidget are unmanaged/hidden

     * after breaking a layout. Default is true. Can be turned off when

      * morphing */

    bool reparentLayoutWidget() const  { return m_reparentLayoutWidget; }

    void setReparentLayoutWidget(bool v) {  m_reparentLayoutWidget = v; }

protected:

    virtual void finishLayout(bool needMove, QLayout *layout = 0);

    virtual bool prepareLayout(bool &needMove, bool &needReparent);

    void setWidgets(const  QWidgetList &widgets) { m_widgets = widgets; }

    QLayout *createLayout(int type);

    void reparentToLayoutBase(QWidget *w);

private slots:

    void widgetDestroyed();

private:

    QWidgetList m_widgets;

    QWidget *m_parentWidget;

    typedef QHash<QWidget *, QRect> WidgetGeometryHash;

    WidgetGeometryHash m_geometries;

    QWidget *m_layoutBase;

    QDesignerFormWindowInterface *m_formWindow;

    const LayoutInfo::Type m_layoutType;

    QPoint m_startPoint;

    QRect m_oldGeometry;

    bool m_reparentLayoutWidget;

    const bool m_isBreak;

};

namespace Utils

{

inline int indexOfWidget(QLayout *layout, QWidget *widget)

{

    int index = 0;

    while (QLayoutItem *item = layout->itemAt(index)) {

        if (item->widget() == widget)

            return index;

        ++index;

    }

    return -1;

}

} // namespace Utils

} // namespace qdesigner_internal

QT_END_NAMESPACE

#endif // LAYOUT_H