Qwt User's Guide  6.2.0
qwt_abstract_legend.h
1 /******************************************************************************
2  * Qwt Widget Library
3  * Copyright (C) 1997 Josef Wilgen
4  * Copyright (C) 2002 Uwe Rathmann
5  *
6  * This library is free software; you can redistribute it and/or
7  * modify it under the terms of the Qwt License, Version 1.0
8  *****************************************************************************/
9 
10 #ifndef QWT_ABSTRACT_LEGEND_H
11 #define QWT_ABSTRACT_LEGEND_H
12 
13 #include "qwt_global.h"
14 #include <qframe.h>
15 
16 class QwtLegendData;
17 template< typename T > class QList;
18 class QVariant;
19 
34 class QWT_EXPORT QwtAbstractLegend : public QFrame
35 {
36  Q_OBJECT
37 
38  public:
39  explicit QwtAbstractLegend( QWidget* parent = NULL );
40  virtual ~QwtAbstractLegend();
41 
51  virtual void renderLegend( QPainter* painter,
52  const QRectF& rect, bool fillBackground ) const = 0;
53 
55  virtual bool isEmpty() const = 0;
56 
57  virtual int scrollExtent( Qt::Orientation ) const;
58 
59  public Q_SLOTS:
60 
67  virtual void updateLegend( const QVariant& itemInfo,
68  const QList< QwtLegendData >& data ) = 0;
69 };
70 
71 #endif
Abstract base class for legend widgets.
virtual void renderLegend(QPainter *painter, const QRectF &rect, bool fillBackground) const =0
virtual bool isEmpty() const =0
virtual void updateLegend(const QVariant &itemInfo, const QList< QwtLegendData > &data)=0
Update the entries for a plot item.
Attributes of an entry on a legend.