QgsSymbolLayerId Class Reference

We may need stable references to symbol layers, when pointers to symbol layers is not usable (when a symbol or a feature renderer is cloned for example). More...

#include <qgssymbollayerreference.h>

Public Member Functions
	QgsSymbolLayerId ()
	QgsSymbolLayerId (const QgsSymbolLayerId &other)=default
	Default copy constructor. More...
	QgsSymbolLayerId (const QString &key, const QVector< int > &indexPath)
	QgsSymbolLayerId constructor with a symbol key and an index path. More...
	QgsSymbolLayerId (const QString &key, int index)
	QgsSymbolLayerId constructor with a symbol key and a unique symbol layer index. More...
bool	operator< (const QgsSymbolLayerId &other) const
	Comparison operator, for storage in a QSet or QMap. More...
QgsSymbolLayerId &	operator= (const QgsSymbolLayerId &other)=default
	Default assignment operator. More...
bool	operator== (const QgsSymbolLayerId &other) const
	Equality operator. More...
QString	symbolKey () const
	Returns the key associated to the symbol. More...
QVector< int >	symbolLayerIndexPath () const
	Returns the symbol layer index path inside the symbol. More...

Detailed Description

We may need stable references to symbol layers, when pointers to symbol layers is not usable (when a symbol or a feature renderer is cloned for example).

A symbol layer identifier consists of:

• an identifier to its symbol (given by the QgsFeatureRenderer)
• a path of indexes inside its symbol and subsymbols.

For a symbol in a QgsSingleSymbolRenderer that has two symbol layers, it will give:

• "" for the symbol key
• [0] and [1] for the two symbol layer indexes

For a QgsRuleBasedRenderer each rule key is the symbol key.

For a symbol with a symbol layer that has a sub symbol (say a QgsArrowSymbolLayer), path to symbol layers of the sub symbol are given by a list of indexes:

• [0, 0] : first symbol layer of the sub symbol of the first symbol layer
• [0, 1] : second symbol layer of the sub symbol of the first symbol layer
• [2, 0] : first symbol layer of the sub symbol of the third symbol layer, etc.

Since

QGIS 3.12

Definition at line 53 of file qgssymbollayerreference.h.

Constructor & Destructor Documentation

QgsSymbolLayerId() [1/4]

QgsSymbolLayerId::QgsSymbolLayerId ( )

inline

Definition at line 56 of file qgssymbollayerreference.h.

QgsSymbolLayerId() [2/4]

QgsSymbolLayerId::QgsSymbolLayerId ( const QString &  key, int  index  )

inline

QgsSymbolLayerId constructor with a symbol key and a unique symbol layer index.

Definition at line 61 of file qgssymbollayerreference.h.

QgsSymbolLayerId() [3/4]

QgsSymbolLayerId::QgsSymbolLayerId ( const QString &  key, const QVector< int > &  indexPath  )

inline

QgsSymbolLayerId constructor with a symbol key and an index path.

Definition at line 68 of file qgssymbollayerreference.h.

QgsSymbolLayerId() [4/4]

QgsSymbolLayerId::QgsSymbolLayerId ( const QgsSymbolLayerId &  other )

default

Default copy constructor.

Member Function Documentation

operator<()

bool QgsSymbolLayerId::operator< ( const QgsSymbolLayerId &  other ) const

inline

Comparison operator, for storage in a QSet or QMap.

Definition at line 97 of file qgssymbollayerreference.h.

operator=()

QgsSymbolLayerId& QgsSymbolLayerId::operator= ( const QgsSymbolLayerId &  other )

default

Default assignment operator.

operator==()

bool QgsSymbolLayerId::operator== ( const QgsSymbolLayerId &  other ) const

inline

Equality operator.

Definition at line 91 of file qgssymbollayerreference.h.

symbolKey()

QString QgsSymbolLayerId::symbolKey ( ) const

inline

Returns the key associated to the symbol.

Definition at line 81 of file qgssymbollayerreference.h.

symbolLayerIndexPath()

QVector<int> QgsSymbolLayerId::symbolLayerIndexPath ( ) const

inline

Returns the symbol layer index path inside the symbol.

Definition at line 86 of file qgssymbollayerreference.h.

---

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

• /build/qgis-3.22.4+99unstable/src/core/symbology/qgssymbollayerreference.h