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NAME
QwtAbstractLegend - Abstract base class for legend widgets.
SYNOPSIS
#include <qwt_abstract_legend.h> Inherits QFrame. Inherited by QwtLegend. Public Slots virtual void updateLegend (const QVariant &itemInfo, const QList< QwtLegendData > &data)=0 Update the entries for a plot item. Public Member Functions QwtAbstractLegend (QWidget *parent=NULL) virtual ~QwtAbstractLegend () Destructor. virtual void renderLegend (QPainter *painter, const QRectF &rect, bool fillBackground) const =0 virtual bool isEmpty () const =0 virtual int scrollExtent (Qt::Orientation) const
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
Constructor & Destructor Documentation
QwtAbstractLegend::QwtAbstractLegend (QWidget * parent = NULL) [explicit] Constructor Parameters: parent Parent widget
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. virtual void QwtAbstractLegend::updateLegend (const QVariant & itemInfo, const QList< QwtLegendData > & data) [pure virtual], [slot] Update the entries for a plot item. Parameters: itemInfo Info about an item data List of legend entry attributes for the item
Author
Generated automatically by Doxygen for Qwt User's Guide from the source code. Version 6.1.4 Wed Jan 2 2019 QwtAbstractLegend(3)