Abstract base class for legend widgets. More...

#include <qwt_abstract_legend.h>

Inheritance diagram for QwtAbstractLegend:

Public Slots
virtual void	updateLegend (const QVariant &itemInfo, const QList< QwtLegendData > &data)=0
	Update the entries for a plot item. More...

Public Member Functions
virtual bool	isEmpty () const =0

	QwtAbstractLegend (QWidget *parent=NULL)

virtual void	renderLegend (QPainter *painter, const QRectF &rect, bool fillBackground) const =0

virtual int	scrollExtent (Qt::Orientation) const

virtual	~QwtAbstractLegend ()
	Destructor. More...

Detailed Description

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.

See also: QwtLegend

Definition at line 34 of file qwt_abstract_legend.h.

Constructor & Destructor Documentation

QwtAbstractLegend::QwtAbstractLegend ( QWidget * parent = NULL )

explicit

Constructor

Parameters

parent Parent widget

Definition at line 17 of file qwt_abstract_legend.cpp.

QwtAbstractLegend::~QwtAbstractLegend ( )

virtual

Destructor.

Definition at line 23 of file qwt_abstract_legend.cpp.

Member Function Documentation

virtual bool QwtAbstractLegend::isEmpty ( ) const

pure virtual

Returns: True, when no plot item is inserted

Implemented in QwtLegend.

virtual void QwtAbstractLegend::renderLegend	(	QPainter *	painter,
		const QRectF &	rect,
		bool	fillBackground
	)		const

pure virtual

Render the legend into a given rectangle.

Parameters

painter	Painter
rect	Bounding rectangle
fillBackground	When true, fill rect with the widget background

See also: renderLegend() is used by QwtPlotRenderer

Implemented in QwtLegend.

int QwtAbstractLegend::scrollExtent ( Qt::Orientation orientation ) const

virtual

Return the extent, that is needed for elements to scroll the legend ( usually scrollbars ),

Parameters

orientation Orientation

Returns: Extent of the corresponding scroll element

Reimplemented in QwtLegend.

Definition at line 34 of file qwt_abstract_legend.cpp.

virtual void QwtAbstractLegend::updateLegend	(	const QVariant &	itemInfo,
		const QList< QwtLegendData > &	data
	)

pure virtualslot

Update the entries for a plot item.

Parameters

itemInfo	Info about an item
data	List of legend entry attributes for the item

The documentation for this class was generated from the following files:

Public Slots

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation