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Using this renderer no symbol will be drawn for features, but labeling, diagrams and other non-symbol parts will still be shown. Selections can still be made on the layer in the canvas and selected features will be rendered with a default symbol. Features being edited will also be shown. This is intended as a handy shortcut for layers which you only want to show labels or diagrams for, and avoids the need to render symbols with totally transparent fill/border to achieve this. (fix #12131)
47 lines
1.8 KiB
Plaintext
47 lines
1.8 KiB
Plaintext
/** \ingroup core
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* \class QgsNullSymbolRenderer
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* \brief Null symbol renderer. Renderer which draws no symbols for features by default, but allows for labeling
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* and diagrams for the layer. Selected features will also be drawn with a default symbol.
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* \note Added in version 2.16
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*/
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class QgsNullSymbolRenderer : QgsFeatureRendererV2
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{
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%TypeHeaderCode
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#include <qgsnullsymbolrenderer.h>
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%End
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public:
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QgsNullSymbolRenderer();
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virtual ~QgsNullSymbolRenderer();
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virtual QgsSymbolV2* symbolForFeature( QgsFeature& feature, QgsRenderContext& context );
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virtual QgsSymbolV2* originalSymbolForFeature( QgsFeature& feature, QgsRenderContext& context );
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virtual bool renderFeature( QgsFeature& feature, QgsRenderContext& context, int layer = -1, bool selected = false, bool drawVertexMarker = false );
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virtual void startRender( QgsRenderContext& context, const QgsFields& fields );
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virtual void stopRender( QgsRenderContext& context );
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virtual bool willRenderFeature( QgsFeature& feat, QgsRenderContext& context );
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virtual QList<QString> usedAttributes();
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virtual QString dump() const;
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virtual QgsFeatureRendererV2* clone() const /Factory/;
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virtual QgsSymbolV2List symbols( QgsRenderContext& context ) /PyName=symbols2/;
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/** Creates a null renderer from XML element.
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* @param element DOM element
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* @returns new null symbol renderer
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*/
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static QgsFeatureRendererV2* create( QDomElement& element ) /Factory/;
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virtual QDomElement save( QDomDocument& doc );
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/** Creates a QgsNullSymbolRenderer from an existing renderer.
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* @param renderer renderer to convert from
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* @returns a new renderer if the conversion was possible, otherwise nullptr.
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*/
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static QgsNullSymbolRenderer* convertFromRenderer( const QgsFeatureRendererV2 *renderer ) /Factory/;
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};
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