72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
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/* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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* Qwt Widget Library
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* Copyright (C) 1997 Josef Wilgen
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* Copyright (C) 2002 Uwe Rathmann
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the Qwt License, Version 1.0
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*****************************************************************************/
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#ifndef QWT_ABSTRACT_LEGEND_H
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#define QWT_ABSTRACT_LEGEND_H
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#include "qwt_global.h"
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#include "qwt_legend_data.h"
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#include <qframe.h>
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#include <qlist.h>
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class QVariant;
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/*!
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\brief Abstract base class for legend widgets
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Legends, that need to be under control of the QwtPlot layout system
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need to be derived from QwtAbstractLegend.
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\note Other type of legends can be implemented by connecting to
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the QwtPlot::legendDataChanged() signal. But as these legends
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are unknown to the plot layout system the layout code
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( on screen and for QwtPlotRenderer ) need to be organized
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in application code.
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\sa QwtLegend
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*/
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class QWT_EXPORT QwtAbstractLegend : public QFrame
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{
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Q_OBJECT
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public:
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explicit QwtAbstractLegend( QWidget *parent = NULL );
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virtual ~QwtAbstractLegend();
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/*!
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Render the legend into a given rectangle.
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\param painter Painter
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\param rect Bounding rectangle
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\param fillBackground When true, fill rect with the widget background
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\sa renderLegend() is used by QwtPlotRenderer
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*/
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virtual void renderLegend( QPainter *painter,
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const QRectF &rect, bool fillBackground ) const = 0;
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//! \return True, when no plot item is inserted
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virtual bool isEmpty() const = 0;
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virtual int scrollExtent( Qt::Orientation ) const;
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public Q_SLOTS:
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/*!
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\brief Update the entries for a plot item
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\param itemInfo Info about an item
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\param data List of legend entry attributes for the item
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*/
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virtual void updateLegend( const QVariant &itemInfo,
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const QList<QwtLegendData> &data ) = 0;
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};
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#endif
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