/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.io
**
** This file is part of the Qt Charts module.
**
** Licensees holding valid commercial license for Qt may use this file in
** accordance with the Qt License Agreement provided with the Software
** or, alternatively, in accordance with the terms contained in a written
** agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.io
**
****************************************************************************/

//  W A R N I N G
//  -------------
//
// This file is not part of the Qt Enterprise Chart API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef LEGENDLAYOUT_H
#define LEGENDLAYOUT_H
#include <QtWidgets/QGraphicsLayout>
#include <QtCharts/QChartGlobal>

QT_CHARTS_BEGIN_NAMESPACE

class QLegend;
class LegendMarkerItem;

class LegendLayout : public QGraphicsLayout
{
public:

    LegendLayout(QLegend *legend);
    virtual ~LegendLayout();

    void setGeometry(const QRectF &rect);

    void setOffset(qreal x, qreal y);
    QPointF offset() const;

    void invalidate();
protected:
    QSizeF sizeHint(Qt::SizeHint which, const QSizeF &constraint = QSizeF()) const;
    int count() const { return 0; }
    QGraphicsLayoutItem *itemAt(int) const { return 0; };
    void removeAt(int) {};

private:
    void setAttachedGeometry(const QRectF &rect);
    void setDettachedGeometry(const QRectF &rect);

    struct LegendWidthStruct {
        LegendMarkerItem *item;
        qreal width;
    };
    static bool widthLongerThan(const LegendWidthStruct *item1,
                                const LegendWidthStruct *item2);

private:
    QLegend *m_legend;
    qreal m_offsetX;
    qreal m_offsetY;
    qreal m_minOffsetX;
    qreal m_minOffsetY;
    qreal m_maxOffsetX;
    qreal m_maxOffsetY;
    qreal m_width;
    qreal m_height;
};

QT_CHARTS_END_NAMESPACE

#endif