| 1 | /* -*- mode: C++ ; c-file-style: "stroustrup" -*- *****************************
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| 2 | * Qwt Widget Library
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| 3 | * Copyright (C) 1997 Josef Wilgen
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| 4 | * Copyright (C) 2002 Uwe Rathmann
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| 5 | *
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| 6 | * This library is free software; you can redistribute it and/or
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| 7 | * modify it under the terms of the Qwt License, Version 1.0
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| 8 | *****************************************************************************/
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| 9 |
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| 10 | #ifndef QWT_ABSTRACT_LEGEND_H
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| 11 | #define QWT_ABSTRACT_LEGEND_H
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| 12 |
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| 13 | #include "qwt_global.h"
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| 14 | #include "qwt_legend_data.h"
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| 15 | #include <qframe.h>
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| 16 | #include <qlist.h>
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| 17 |
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| 18 | class QVariant;
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| 19 |
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| 20 | /*!
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| 21 | \brief Abstract base class for legend widgets
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| 22 |
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| 23 | Legends, that need to be under control of the QwtPlot layout system
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| 24 | need to be derived from QwtAbstractLegend.
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| 25 |
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| 26 | \note Other type of legends can be implemented by connecting to
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| 27 | the QwtPlot::legendDataChanged() signal. But as these legends
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| 28 | are unknown to the plot layout system the layout code
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| 29 | ( on screen and for QwtPlotRenderer ) need to be organized
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| 30 | in application code.
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| 31 |
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| 32 | \sa QwtLegend
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| 33 | */
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| 34 | class QWT_EXPORT QwtAbstractLegend : public QFrame
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| 35 | {
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| 36 | Q_OBJECT
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| 37 |
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| 38 | public:
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| 39 | explicit QwtAbstractLegend( QWidget *parent = NULL );
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| 40 | virtual ~QwtAbstractLegend();
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| 41 |
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| 42 | /*!
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| 43 | Render the legend into a given rectangle.
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| 44 |
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| 45 | \param painter Painter
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| 46 | \param rect Bounding rectangle
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| 47 | \param fillBackground When true, fill rect with the widget background
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| 48 |
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| 49 | \sa renderLegend() is used by QwtPlotRenderer
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| 50 | */
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| 51 | virtual void renderLegend( QPainter *painter,
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| 52 | const QRectF &rect, bool fillBackground ) const = 0;
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| 53 |
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| 54 | //! \return True, when no plot item is inserted
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| 55 | virtual bool isEmpty() const = 0;
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| 56 |
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| 57 | virtual int scrollExtent( Qt::Orientation ) const;
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| 58 |
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| 59 | public Q_SLOTS:
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| 60 |
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| 61 | /*!
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| 62 | \brief Update the entries for a plot item
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| 63 |
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| 64 | \param itemInfo Info about an item
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| 65 | \param data List of legend entry attributes for the item
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| 66 | */
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| 67 | virtual void updateLegend( const QVariant &itemInfo,
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| 68 | const QList<QwtLegendData> &data ) = 0;
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| 69 | };
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| 70 |
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| 71 | #endif
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