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. | |
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. | |
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] |
| 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 virtual, slot] |
Update the entries for a plot item.
- Parameters:
-
itemInfo Info about an item data List of legend entry attributes for the item
Implemented in QwtLegend.
The documentation for this class was generated from the following files: