Abstract base class for legend widgets 更多...

类 QwtAbstractLegend 继承关系图:

Public 槽
virtual void	updateLegend (const QVariant &itemInfo, const QList< QwtLegendData > &data)=0

Public 成员函数
	QwtAbstractLegend (QWidget *parent=nullptr)
	Constructor for QwtAbstractLegend

	~QwtAbstractLegend () override
	Destructor for QwtAbstractLegend

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

virtual bool	isEmpty () const =0

virtual int	scrollExtent (Qt::Orientation) const
	Return the extent needed for scroll elements

详细描述

Abstract base class for legend widgets

Legends that need to be under control of the QwtPlot layout system need to be derived from QwtAbstractLegend.

注解: 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.

构造及析构函数说明

QwtAbstractLegend::QwtAbstractLegend ( QWidget * parent = nullptr )

explicit

参数

parent Parent widget

virtual bool QwtAbstractLegend::isEmpty ( ) const

pure virtual

在 QwtLegend 内被实现.

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

pure virtual

在 QwtLegend 内被实现.

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

virtual

Return the extent needed for scroll elements

Returns the space needed for elements to scroll the legend (usually scrollbars).

参数

orientation Orientation (Horizontal or Vertical)

被 QwtLegend 重载.

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