qwt_abstract_legend.h

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/******************************************************************************
 * Qwt Widget Library
 * Copyright (C) 1997   Josef Wilgen
 * Copyright (C) 2002   Uwe Rathmann
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the Qwt License, Version 1.0
 *****************************************************************************/

#ifndef QWT_ABSTRACT_LEGEND_H
#define QWT_ABSTRACT_LEGEND_H

#include "qwt_global.h"
#include <qframe.h>

class QwtLegendData;
template< typename T > class QList;
class QVariant;

class QWT_EXPORT QwtAbstractLegend : public QFrame
{
    Q_OBJECT

  public:
    explicit QwtAbstractLegend( QWidget* parent = NULL );
    virtual ~QwtAbstractLegend();

    virtual void renderLegend( QPainter* painter,
        const QRectF& rect, bool fillBackground ) const = 0;

    virtual bool isEmpty() const = 0;

    virtual int scrollExtent( Qt::Orientation ) const;

  public Q_SLOTS:

    virtual void updateLegend( const QVariant& itemInfo,
        const QList< QwtLegendData >& data ) = 0;
};

#endif