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doc/man/man3/QwtAbstractLegend.3

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+.TH "QwtAbstractLegend" 3 "Sun Jul 18 2021" "Version 6.2.0" "Qwt User's Guide" \" -*- nroff -*-
+.ad l
+.nh
+.SH NAME
+QwtAbstractLegend \- Abstract base class for legend widgets\&.  
+
+.SH SYNOPSIS
+.br
+.PP
+.PP
+\fC#include <qwt_abstract_legend\&.h>\fP
+.PP
+Inherits QFrame\&.
+.PP
+Inherited by \fBQwtLegend\fP\&.
+.SS "Public Slots"
+
+.in +1c
+.ti -1c
+.RI "virtual void \fBupdateLegend\fP (const QVariant &itemInfo, const \fBQList\fP< \fBQwtLegendData\fP > &data)=0"
+.br
+.RI "Update the entries for a plot item\&. "
+.in -1c
+.SS "Public Member Functions"
+
+.in +1c
+.ti -1c
+.RI "\fBQwtAbstractLegend\fP (QWidget *parent=NULL)"
+.br
+.ti -1c
+.RI "virtual \fB~QwtAbstractLegend\fP ()"
+.br
+.RI "Destructor\&. "
+.ti -1c
+.RI "virtual void \fBrenderLegend\fP (QPainter *painter, const QRectF &rect, bool fillBackground) const =0"
+.br
+.ti -1c
+.RI "virtual bool \fBisEmpty\fP () const =0"
+.br
+.ti -1c
+.RI "virtual int \fBscrollExtent\fP (Qt::Orientation) const"
+.br
+.in -1c
+.SH "Detailed Description"
+.PP 
+Abstract base class for legend widgets\&. 
+
+Legends, that need to be under control of the \fBQwtPlot\fP layout system need to be derived from \fBQwtAbstractLegend\fP\&.
+.PP
+\fBNote\fP
+.RS 4
+Other type of legends can be implemented by connecting to the \fBQwtPlot::legendDataChanged()\fP signal\&. But as these legends are unknown to the plot layout system the layout code ( on screen and for \fBQwtPlotRenderer\fP ) need to be organized in application code\&.
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBQwtLegend\fP 
+.RE
+.PP
+
+.PP
+Definition at line 34 of file qwt_abstract_legend\&.h\&.
+.SH "Constructor & Destructor Documentation"
+.PP 
+.SS "QwtAbstractLegend::QwtAbstractLegend (QWidget * parent = \fCNULL\fP)\fC [explicit]\fP"
+Constructor
+.PP
+\fBParameters\fP
+.RS 4
+\fIparent\fP Parent widget 
+.RE
+.PP
+
+.PP
+Definition at line 18 of file qwt_abstract_legend\&.cpp\&.
+.SH "Member Function Documentation"
+.PP 
+.SS "virtual bool QwtAbstractLegend::isEmpty () const\fC [pure virtual]\fP"
+
+.PP
+\fBReturns\fP
+.RS 4
+True, when no plot item is inserted 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtLegend\fP\&.
+.SS "virtual void QwtAbstractLegend::renderLegend (QPainter * painter, const QRectF & rect, bool fillBackground) const\fC [pure virtual]\fP"
+Render the legend into a given rectangle\&.
+.PP
+\fBParameters\fP
+.RS 4
+\fIpainter\fP Painter 
+.br
+\fIrect\fP Bounding rectangle 
+.br
+\fIfillBackground\fP When true, fill rect with the widget background
+.RE
+.PP
+\fBSee also\fP
+.RS 4
+\fBrenderLegend()\fP is used by \fBQwtPlotRenderer\fP 
+.RE
+.PP
+
+.PP
+Implemented in \fBQwtLegend\fP\&.
+.SS "int QwtAbstractLegend::scrollExtent (Qt::Orientation orientation) const\fC [virtual]\fP"
+Return the extent, that is needed for elements to scroll the legend ( usually scrollbars ),
+.PP
+\fBParameters\fP
+.RS 4
+\fIorientation\fP Orientation 
+.RE
+.PP
+\fBReturns\fP
+.RS 4
+Extent of the corresponding scroll element 
+.RE
+.PP
+
+.PP
+Reimplemented in \fBQwtLegend\fP\&.
+.PP
+Definition at line 35 of file qwt_abstract_legend\&.cpp\&.
+.SS "virtual void QwtAbstractLegend::updateLegend (const QVariant & itemInfo, const \fBQList\fP< \fBQwtLegendData\fP > & data)\fC [pure virtual]\fP, \fC [slot]\fP"
+
+.PP
+Update the entries for a plot item\&. 
+.PP
+\fBParameters\fP
+.RS 4
+\fIitemInfo\fP Info about an item 
+.br
+\fIdata\fP List of legend entry attributes for the item 
+.RE
+.PP
+
+
+.SH "Author"
+.PP 
+Generated automatically by Doxygen for Qwt User's Guide from the source code\&.