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93 lines
3.6 KiB
Plaintext
93 lines
3.6 KiB
Plaintext
/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsrenderedfeaturehandlerinterface.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.py again *
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************************************************************************/
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class QgsRenderedFeatureHandlerInterface
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{
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%Docstring(signature="appended")
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An interface for classes which provide custom handlers for features
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rendered as part of a map render job.
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:py:class:`QgsRenderedFeatureHandlerInterface` objects are registered in
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the :py:class:`QgsMapSettings` objects used to construct map render
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jobs. During the rendering operation, the
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:py:func:`~handleRenderedFeature` method will be called once for every
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rendered feature, allowing the handler to perform some custom task based
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on the provided information.
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They can be used for custom tasks which operate on a set of rendered
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features, such as creating spatial indexes of the location and rendered
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symbology bounding box of all features rendered on a map.
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.. versionadded:: 3.10
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%End
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%TypeHeaderCode
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#include "qgsrenderedfeaturehandlerinterface.h"
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%End
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public:
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virtual ~QgsRenderedFeatureHandlerInterface();
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struct RenderedFeatureContext
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{
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RenderedFeatureContext( const QgsRenderContext &renderContext );
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%Docstring
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Constructor for RenderedFeatureContext.
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:param renderContext: The render context which was used while rendering
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feature.
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%End
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const QgsRenderContext &renderContext;
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%Docstring
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The render context which was used while rendering feature.
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%End
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private:
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RenderedFeatureContext &operator=( const RenderedFeatureContext & );
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};
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virtual void handleRenderedFeature( const QgsFeature &feature, const QgsGeometry &renderedBounds, const QgsRenderedFeatureHandlerInterface::RenderedFeatureContext &context ) = 0;
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%Docstring
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Called whenever a ``feature`` is rendered during a map render job.
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The ``renderedBounds`` argument specifies the (approximate) bounds of
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the rendered feature's symbology. E.g. for point geometry features, this
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will be the bounding box of the marker symbol used to symbolize the
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point. ``renderedBounds`` geometries are specified in painter units (not
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map units).
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.. warning::
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This method may be called from many different threads (for multi-threaded map render operations),
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and accordingly care must be taken to ensure that :py:func:`~QgsRenderedFeatureHandlerInterface.handleRenderedFeature` implementations are
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appropriately thread safe.
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The ``context`` argument is used to provide additional context relating
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to the rendering of a feature.
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%End
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virtual QSet<QString> usedAttributes( QgsVectorLayer *layer, const QgsRenderContext &context ) const;
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%Docstring
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Returns a list of attributes required by this handler, for the specified
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``layer``. Attributes not listed in here may not be requested from the
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provider at rendering time.
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%End
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};
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/************************************************************************
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* This file has been generated automatically from *
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* *
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* src/core/qgsrenderedfeaturehandlerinterface.h *
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* *
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* Do not edit manually ! Edit header and run scripts/sipify.py again *
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************************************************************************/
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