A QgsLabelingEngine implementation, which only calculates the labeling solution during its run() method. More...

#include <qgslabelingengine.h>

Inheritance diagram for QgsStagedRenderLabelingEngine:

Public Member Functions
	QgsStagedRenderLabelingEngine ()
	Construct the labeling engine with default settings. More...

	QgsStagedRenderLabelingEngine (const QgsStagedRenderLabelingEngine &rh)=delete
	QgsStagedRenderLabelingEngine cannot be copied. More...

void	finalize ()
	Finalizes and cleans up the engine following the rendering of labels for the last layer to be labeled (via renderLabelsForLayer() ). More...

QgsStagedRenderLabelingEngine &	operator= (const QgsStagedRenderLabelingEngine &rh)=delete
	QgsStagedRenderLabelingEngine cannot be copied. More...

void	renderLabelsForLayer (QgsRenderContext &context, const QString &layerId)
	Renders all the labels which belong only to the layer with matching layerId to the specified render context. More...

void	run (QgsRenderContext &context) override
	Runs the labeling job. More...

Public Member Functions inherited from QgsLabelingEngine
	QgsLabelingEngine ()
	Construct the labeling engine with default settings. More...

	QgsLabelingEngine (const QgsLabelingEngine &rh)=delete
	QgsLabelingEngine cannot be copied. More...

virtual	~QgsLabelingEngine ()
	Clean up everything (especially the registered providers) More...

void	addProvider (QgsAbstractLabelProvider *provider)
	Add provider of label features. Takes ownership of the provider. More...

const QgsLabelingEngineSettings &	engineSettings () const
	Gets associated labeling engine settings. More...

const QgsMapSettings &	mapSettings () const
	Gets associated map settings. More...

QgsLabelingEngine &	operator= (const QgsLabelingEngine &rh)=delete
	QgsLabelingEngine cannot be copied. More...

QStringList	participatingLayerIds () const
	Returns a list of layer IDs for layers with providers in the engine. More...

QList< QgsMapLayer * >	participatingLayers () const
	Returns a list of layers with providers in the engine. More...

void	removeProvider (QgsAbstractLabelProvider *provider)
	Remove provider if the provider's initialization failed. Provider instance is deleted. More...

QgsLabelingResults *	results () const
	For internal use by the providers. More...

void	setMapSettings (const QgsMapSettings &mapSettings)
	Associate map settings instance. More...

QgsLabelingResults *	takeResults ()
	Returns pointer to recently computed results and pass the ownership of results to the caller. More...

Additional Inherited Members
Protected Member Functions inherited from QgsLabelingEngine
void	cleanup ()
	Cleans up the engine following a call to registerLabels() or solve(). More...

void	drawLabels (QgsRenderContext &context, const QString &layerId=QString())
	Draws labels to the specified render context. More...

void	processProvider (QgsAbstractLabelProvider *provider, QgsRenderContext &context, pal::Pal &p)

void	registerLabels (QgsRenderContext &context)
	Runs the label registration step. More...

void	solve (QgsRenderContext &context)
	Solves the label problem. More...

Protected Attributes inherited from QgsLabelingEngine
QList< pal::LabelPosition * >	mLabels

QgsMapSettings	mMapSettings
	Associated map settings instance. More...

std::unique_ptr< pal::Pal >	mPal

std::unique_ptr< pal::Problem >	mProblem

QList< QgsAbstractLabelProvider * >	mProviders
	List of providers (the are owned by the labeling engine) More...

std::unique_ptr< QgsLabelingResults >	mResults
	Resulting labeling layout. More...

QList< QgsAbstractLabelProvider * >	mSubProviders

QList< pal::LabelPosition * >	mUnlabeled

Detailed Description

A QgsLabelingEngine implementation, which only calculates the labeling solution during its run() method.

The actual rendering of labels themselves is deferred to follow up calls to ....

Note: this class is not a part of public API yet. See notes in QgsLabelingEngine; not available in Python bindings

Since: QGIS 3.10

Definition at line 362 of file qgslabelingengine.h.

Constructor & Destructor Documentation

◆ QgsStagedRenderLabelingEngine() [1/2]

QgsStagedRenderLabelingEngine::QgsStagedRenderLabelingEngine ( )

Construct the labeling engine with default settings.

Definition at line 570 of file qgslabelingengine.cpp.

◆ QgsStagedRenderLabelingEngine() [2/2]

QgsStagedRenderLabelingEngine::QgsStagedRenderLabelingEngine ( const QgsStagedRenderLabelingEngine & rh )

delete

QgsStagedRenderLabelingEngine cannot be copied.

Member Function Documentation

◆ finalize()

void QgsStagedRenderLabelingEngine::finalize ( )

Finalizes and cleans up the engine following the rendering of labels for the last layer to be labeled (via renderLabelsForLayer() ).

Definition at line 599 of file qgslabelingengine.cpp.

◆ operator=()

QgsStagedRenderLabelingEngine& QgsStagedRenderLabelingEngine::operator= ( const QgsStagedRenderLabelingEngine & rh )

delete

QgsStagedRenderLabelingEngine cannot be copied.

◆ renderLabelsForLayer()

void QgsStagedRenderLabelingEngine::renderLabelsForLayer	(	QgsRenderContext &	context,
		const QString &	layerId
	)

Renders all the labels which belong only to the layer with matching layerId to the specified render context.

Definition at line 594 of file qgslabelingengine.cpp.

◆ run()

void QgsStagedRenderLabelingEngine::run ( QgsRenderContext & context )

overridevirtual

Runs the labeling job.

Depending on the concrete labeling engine class, this will either run the whole labeling job, including rendering the labels themselves, OR possibly just run the labeling job but leave the rendering to a future, deferred stage.

Implements QgsLabelingEngine.

Definition at line 576 of file qgslabelingengine.cpp.

The documentation for this class was generated from the following files:

/build/qgis-3.18.1+99unstable/src/core/labeling/qgslabelingengine.h
/build/qgis-3.18.1+99unstable/src/core/labeling/qgslabelingengine.cpp

Public Member Functions

Additional Inherited Members