qwt_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_LEGEND_H
#define QWT_LEGEND_H

#include "qwt_global.h"
#include "qwt_abstract_legend.h"
#include "qwt_legend_data.h"

#include <qvariant.h>

class QScrollBar;

class QWT_EXPORT QwtLegend : public QwtAbstractLegend
{
    Q_OBJECT

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

    void setMaxColumns( uint numColums );
    uint maxColumns() const;

    void setDefaultItemMode( QwtLegendData::Mode );
    QwtLegendData::Mode defaultItemMode() const;

    QWidget* contentsWidget();
    const QWidget* contentsWidget() const;

    QWidget* legendWidget( const QVariant&  ) const;
    QList< QWidget* > legendWidgets( const QVariant& ) const;

    QVariant itemInfo( const QWidget* ) const;

    virtual bool eventFilter( QObject*, QEvent* ) QWT_OVERRIDE;

    virtual QSize sizeHint() const QWT_OVERRIDE;
    virtual int heightForWidth( int w ) const QWT_OVERRIDE;

    QScrollBar* horizontalScrollBar() const;
    QScrollBar* verticalScrollBar() const;

    virtual void renderLegend( QPainter*,
        const QRectF&, bool fillBackground ) const QWT_OVERRIDE;

    virtual void renderItem( QPainter*,
        const QWidget*, const QRectF&, bool fillBackground ) const;

    virtual bool isEmpty() const QWT_OVERRIDE;
    virtual int scrollExtent( Qt::Orientation ) const QWT_OVERRIDE;

  Q_SIGNALS:
    void clicked( const QVariant& itemInfo, int index );

    void checked( const QVariant& itemInfo, bool on, int index );

  public Q_SLOTS:
    virtual void updateLegend( const QVariant&,
        const QList< QwtLegendData >& ) QWT_OVERRIDE;

  protected Q_SLOTS:
    void itemClicked();
    void itemChecked( bool );

  protected:
    virtual QWidget* createWidget( const QwtLegendData& ) const;
    virtual void updateWidget( QWidget*, const QwtLegendData& );

  private:
    void updateTabOrder();

    class PrivateData;
    PrivateData* m_data;
};

#endif