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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
* 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 "qwt_legend_data.h"
#include <qframe.h>
#include <qlist.h>
class QVariant;
/*!
\brief Abstract base class for legend widgets
Legends, that need to be under control of the QwtPlot layout system
need to be derived from QwtAbstractLegend.
\note Other type of legends can be implemented by connecting to
the QwtPlot::legendDataChanged() signal. But as these legends
are unknown to the plot layout system the layout code
( on screen and for QwtPlotRenderer ) need to be organized
in application code.
\sa QwtLegend
*/
class QWT_EXPORT QwtAbstractLegend : public QFrame
{
Q_OBJECT
public:
explicit QwtAbstractLegend( QWidget *parent = NULL );
virtual ~QwtAbstractLegend();
/*!
Render the legend into a given rectangle.
\param painter Painter
\param rect Bounding rectangle
\param fillBackground When true, fill rect with the widget background
\sa renderLegend() is used by QwtPlotRenderer
*/
virtual void renderLegend( QPainter *painter,
const QRectF &rect, bool fillBackground ) const = 0;
//! \return True, when no plot item is inserted
virtual bool isEmpty() const = 0;
virtual int scrollExtent( Qt::Orientation ) const;
public Q_SLOTS:
/*!
\brief Update the entries for a plot item
\param itemInfo Info about an item
\param data List of legend entry attributes for the item
*/
virtual void updateLegend( const QVariant &itemInfo,
const QList<QwtLegendData> &data ) = 0;
};
#endif