Rule based labeling for a vector layer. More...

#include <qgsrulebasedlabeling.h>

Inheritance diagram for QgsRuleBasedLabeling:

Classes
class	Rule
	A child rule for QgsRuleBasedLabeling. More...

Public Types
typedef QList< QgsRuleBasedLabeling::Rule * >	RuleList

typedef QMap< QgsRuleBasedLabeling::Rule , QgsVectorLayerLabelProvider >	RuleToProviderMap

Public Member Functions
	QgsRuleBasedLabeling (QgsRuleBasedLabeling::Rule *root)
	Constructs the labeling from given tree of rules (takes ownership)

	~QgsRuleBasedLabeling () override

bool	accept (QgsStyleEntityVisitorInterface *visitor) const override
	Accepts the specified symbology visitor, causing it to visit all symbols associated with the labeling.

QgsRuleBasedLabeling *	clone () const override
	Returns a new copy of the object.

void	multiplyOpacity (double opacityFactor) override
	Multiply opacity by opacityFactor.

QgsVectorLayerLabelProvider *	provider (QgsVectorLayer *layer) const override

bool	requiresAdvancedEffects () const override
	Returns `true` if drawing labels requires advanced effects like composition modes, which could prevent it being used as an isolated cached image or exported to a vector format.

QgsRuleBasedLabeling::Rule *	rootRule ()

const Rule *	rootRule () const

QDomElement	save (QDomDocument &doc, const QgsReadWriteContext &context) const override
	Returns labeling configuration as XML element.

void	setSettings (QgsPalLayerSettings *settings, const QString &providerId=QString()) override
	Set pal settings for a specific provider (takes ownership).

QgsPalLayerSettings	settings (const QString &providerId=QString()) const override
	Gets associated label settings.

QStringList	subProviders () const override
	Gets list of sub-providers within the layer's labeling.

void	toSld (QDomNode &parent, const QVariantMap &props) const override
	Writes the SE 1.1 TextSymbolizer element based on the current layer labeling settings.

QString	type () const override
	Unique type string of the labeling configuration implementation.

Public Member Functions inherited from QgsAbstractVectorLayerLabeling
	QgsAbstractVectorLayerLabeling ()=default

virtual	~QgsAbstractVectorLayerLabeling ()=default

Static Public Member Functions
static QgsRuleBasedLabeling *	create (const QDomElement &element, const QgsReadWriteContext &context)
	Create the instance from a DOM element with saved configuration.

Static Public Member Functions inherited from QgsAbstractVectorLayerLabeling
static QgsAbstractVectorLayerLabeling *	create (const QDomElement &element, const QgsReadWriteContext &context)
	Try to create instance of an implementation based on the XML data.

static QgsPalLayerSettings	defaultSettingsForLayer (const QgsVectorLayer *layer)
	Returns the default layer settings to use for the specified vector layer.

Protected Attributes
std::unique_ptr< Rule >	mRootRule

Additional Inherited Members
Protected Member Functions inherited from QgsAbstractVectorLayerLabeling
virtual void	writeTextSymbolizer (QDomNode &parent, QgsPalLayerSettings &settings, const QVariantMap &props) const
	Writes a TextSymbolizer element contents based on the provided labeling settings.

Detailed Description

Rule based labeling for a vector layer.

Definition at line 41 of file qgsrulebasedlabeling.h.

Member Typedef Documentation

◆ RuleList

typedef QList<QgsRuleBasedLabeling::Rule *> QgsRuleBasedLabeling::RuleList

Definition at line 45 of file qgsrulebasedlabeling.h.

◆ RuleToProviderMap

typedef QMap<QgsRuleBasedLabeling::Rule *, QgsVectorLayerLabelProvider *> QgsRuleBasedLabeling::RuleToProviderMap

Definition at line 46 of file qgsrulebasedlabeling.h.

Constructor & Destructor Documentation

◆ QgsRuleBasedLabeling()

QgsRuleBasedLabeling::QgsRuleBasedLabeling ( QgsRuleBasedLabeling::Rule * root )

explicit

Constructs the labeling from given tree of rules (takes ownership)

Definition at line 444 of file qgsrulebasedlabeling.cpp.

◆ ~QgsRuleBasedLabeling()

QgsRuleBasedLabeling::~QgsRuleBasedLabeling ( )

override

Definition at line 465 of file qgsrulebasedlabeling.cpp.

Member Function Documentation

◆ accept()

bool QgsRuleBasedLabeling::accept ( QgsStyleEntityVisitorInterface * visitor ) const

overridevirtual

Accepts the specified symbology visitor, causing it to visit all symbols associated with the labeling.

Returns true if the visitor should continue visiting other objects, or false if visiting should be canceled.

Since: QGIS 3.10

Reimplemented from QgsAbstractVectorLayerLabeling.

Definition at line 530 of file qgsrulebasedlabeling.cpp.

◆ clone()

QgsRuleBasedLabeling * QgsRuleBasedLabeling::clone ( ) const

overridevirtual

Returns a new copy of the object.

Implements QgsAbstractVectorLayerLabeling.

Definition at line 449 of file qgsrulebasedlabeling.cpp.

◆ create()

QgsRuleBasedLabeling * QgsRuleBasedLabeling::create	(	const QDomElement &	element,
		const QgsReadWriteContext &	context
	)

static

Create the instance from a DOM element with saved configuration.

Definition at line 480 of file qgsrulebasedlabeling.cpp.

◆ multiplyOpacity()

void QgsRuleBasedLabeling::multiplyOpacity ( double opacityFactor )

overridevirtual

Multiply opacity by opacityFactor.

This method multiplies the opacity of the labeling elements (text, shadow, buffer etc.) by opacity effectively changing the opacity of the whole labeling elements.

Since: QGIS 3.32

Reimplemented from QgsAbstractVectorLayerLabeling.

Definition at line 591 of file qgsrulebasedlabeling.cpp.

◆ provider()

QgsVectorLayerLabelProvider * QgsRuleBasedLabeling::provider ( QgsVectorLayer * layer ) const

overridevirtual

Note: not available in Python bindings

Reimplemented from QgsAbstractVectorLayerLabeling.

Definition at line 509 of file qgsrulebasedlabeling.cpp.

◆ requiresAdvancedEffects()

bool QgsRuleBasedLabeling::requiresAdvancedEffects ( ) const

overridevirtual

Returns true if drawing labels requires advanced effects like composition modes, which could prevent it being used as an isolated cached image or exported to a vector format.

Implements QgsAbstractVectorLayerLabeling.

Definition at line 535 of file qgsrulebasedlabeling.cpp.

◆ rootRule() [1/2]

QgsRuleBasedLabeling::Rule * QgsRuleBasedLabeling::rootRule ( )

Definition at line 469 of file qgsrulebasedlabeling.cpp.

◆ rootRule() [2/2]

const QgsRuleBasedLabeling::Rule * QgsRuleBasedLabeling::rootRule ( ) const

Definition at line 474 of file qgsrulebasedlabeling.cpp.

◆ save()

QDomElement QgsRuleBasedLabeling::save	(	QDomDocument &	doc,
		const QgsReadWriteContext &	context
	)		const

overridevirtual

Returns labeling configuration as XML element.

Implements QgsAbstractVectorLayerLabeling.

Definition at line 497 of file qgsrulebasedlabeling.cpp.

◆ setSettings()

void QgsRuleBasedLabeling::setSettings	(	QgsPalLayerSettings *	settings,
		const QString &	providerId = `QString()`
	)

overridevirtual

Set pal settings for a specific provider (takes ownership).

Parameters

settings	Pal layer settings
providerId	The id of the provider

Implements QgsAbstractVectorLayerLabeling.

Definition at line 540 of file qgsrulebasedlabeling.cpp.

◆ settings()

QgsPalLayerSettings QgsRuleBasedLabeling::settings ( const QString & providerId = QString() ) const

overridevirtual

Gets associated label settings.

In case of multiple sub-providers with different settings, they are identified by their ID (e.g. in case of rule-based labeling, provider ID == rule key)

Implements QgsAbstractVectorLayerLabeling.

Definition at line 521 of file qgsrulebasedlabeling.cpp.

◆ subProviders()

QStringList QgsRuleBasedLabeling::subProviders ( ) const

overridevirtual

Gets list of sub-providers within the layer's labeling.

Reimplemented from QgsAbstractVectorLayerLabeling.

Definition at line 514 of file qgsrulebasedlabeling.cpp.

◆ toSld()

void QgsRuleBasedLabeling::toSld	(	QDomNode &	parent,
		const QVariantMap &	props
	)		const

overridevirtual

Writes the SE 1.1 TextSymbolizer element based on the current layer labeling settings.

Reimplemented from QgsAbstractVectorLayerLabeling.

Definition at line 550 of file qgsrulebasedlabeling.cpp.

◆ type()

QString QgsRuleBasedLabeling::type ( ) const

overridevirtual

Unique type string of the labeling configuration implementation.

Implements QgsAbstractVectorLayerLabeling.

Definition at line 492 of file qgsrulebasedlabeling.cpp.

Member Data Documentation

◆ mRootRule

std::unique_ptr<Rule> QgsRuleBasedLabeling::mRootRule

protected

Definition at line 393 of file qgsrulebasedlabeling.h.

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

/build/qgis-3.41.0+git20241201+3c143d501a8+99sid/src/core/labeling/qgsrulebasedlabeling.h
/build/qgis-3.41.0+git20241201+3c143d501a8+99sid/src/core/labeling/qgsrulebasedlabeling.cpp

Classes

Public Types

Public Member Functions

Static Public Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ RuleList

◆ RuleToProviderMap

Constructor & Destructor Documentation

◆ QgsRuleBasedLabeling()

◆ ~QgsRuleBasedLabeling()

Member Function Documentation

◆ accept()

◆ clone()

◆ create()

◆ multiplyOpacity()

◆ provider()

◆ requiresAdvancedEffects()

◆ rootRule() [1/2]

◆ rootRule() [2/2]

◆ save()

◆ setSettings()

◆ settings()

◆ subProviders()

◆ toSld()

◆ type()

Member Data Documentation

◆ mRootRule