A grouped map of multiple QgsProperty objects, each referenced by a integer key value. More...

#include <qgspropertycollection.h>

Inheritance diagram for QgsPropertyCollection:

Public Member Functions
	QgsPropertyCollection (const QgsPropertyCollection &other)
	Copy constructor. More...

	QgsPropertyCollection (const QString &name=QString())
	Constructor for QgsPropertyCollection. More...

void	clear () override
	Removes all properties from the collection. More...

int	count () const
	Returns the number of properties contained within the collection. More...

bool	hasActiveProperties () const override
	Returns `true` if the collection has any active properties, or `false` if all properties within the collection are deactivated. More...

bool	hasDynamicProperties () const override
	Returns `true` if the collection has any active, non-static properties, or `false` if either all non-static properties within the collection are deactivated or if the collection only contains static properties. More...

bool	hasProperty (int key) const override
	Returns `true` if the collection contains a property with the specified key. More...

bool	isActive (int key) const override
	Returns `true` if the collection contains an active property with the specified key. More...

bool	loadVariant (const QVariant &configuration, const QgsPropertiesDefinition &definitions) override
	Loads this property collection from a QVariantMap, wrapped in a QVariant. More...

bool	operator!= (const QgsPropertyCollection &other) const

QgsPropertyCollection &	operator= (const QgsPropertyCollection &other)

bool	operator== (const QgsPropertyCollection &other) const

bool	prepare (const QgsExpressionContext &context=QgsExpressionContext()) const override
	Prepares the collection against a specified expression context. More...

virtual QgsProperty &	property (int key)
	Returns a reference to a matching property from the collection, if one exists. More...

QgsProperty	property (int key) const override
	Returns a matching property from the collection, if one exists. More...

QSet< int >	propertyKeys () const override
	Returns a list of property keys contained within the collection. More...

QSet< QString >	referencedFields (const QgsExpressionContext &context=QgsExpressionContext(), bool ignoreContext=false) const override
	Returns the set of any fields referenced by the active properties from the collection. More...

void	setProperty (int key, const QgsProperty &property)
	Adds a property to the collection and takes ownership of it. More...

void	setProperty (int key, const QVariant &value)
	Convenience method, creates a QgsStaticProperty and stores it within the collection. More...

QVariant	toVariant (const QgsPropertiesDefinition &definitions) const override
	Saves this property collection to a QVariantMap, wrapped in a QVariant. More...

QVariant	value (int key, const QgsExpressionContext &context, const QVariant &defaultValue=QVariant()) const override
	Returns the calculated value of the property with the specified key from within the collection. More...

Public Member Functions inherited from QgsAbstractPropertyCollection
	QgsAbstractPropertyCollection (const QString &name=QString())
	Constructor for QgsAbstractPropertyCollection. More...

virtual	~QgsAbstractPropertyCollection ()=default

QString	name () const
	Returns the descriptive name of the property collection. More...

virtual bool	readXml (const QDomElement &collectionElem, const QgsPropertiesDefinition &definitions)
	Reads property collection state from an XML element. More...

void	setName (const QString &name)
	Sets the descriptive name for the property collection. More...

bool	valueAsBool (int key, const QgsExpressionContext &context, bool defaultValue=false, bool *ok=nullptr) const
	Calculates the current value of the property with the specified key and interprets it as an boolean. More...

QColor	valueAsColor (int key, const QgsExpressionContext &context, const QColor &defaultColor=QColor(), bool *ok=nullptr) const
	Calculates the current value of the property with the specified key and interprets it as a color. More...

QDateTime	valueAsDateTime (int key, const QgsExpressionContext &context, const QDateTime &defaultDateTime=QDateTime(), bool *ok=nullptr) const
	Calculates the current value of the property with the specified key and interprets it as a datetime. More...

double	valueAsDouble (int key, const QgsExpressionContext &context, double defaultValue=0.0, bool *ok=nullptr) const
	Calculates the current value of the property with the specified key and interprets it as a double. More...

int	valueAsInt (int key, const QgsExpressionContext &context, int defaultValue=0, bool *ok=nullptr) const
	Calculates the current value of the property with the specified key and interprets it as an integer. More...

QString	valueAsString (int key, const QgsExpressionContext &context, const QString &defaultString=QString(), bool *ok=nullptr) const
	Calculates the current value of the property with the specified key and interprets it as a string. More...

virtual bool	writeXml (QDomElement &collectionElem, const QgsPropertiesDefinition &definitions) const
	Writes the current state of the property collection into an XML element. More...

Detailed Description

A grouped map of multiple QgsProperty objects, each referenced by a integer key value.

Properties within a collection are referenced by an integer key. This is done to avoid the cost of string creation and comparisons which would be required by a string key. The intended use case is that a context specific enum is cast to int and used for the key value. Examples of such enums are :

See also: QgsLayoutObject::DataDefinedProperty; QgsSymbolLayer::Property; QgsPalLabeling::Property; QgsAbstract3DSymbol::Property; QgsDiagramLayerSettings::Property; QgsPalLayerSettings::Property; QgsWidgetWrapper::Property

Since: QGIS 3.0

Definition at line 318 of file qgspropertycollection.h.

Constructor & Destructor Documentation

◆ QgsPropertyCollection() [1/2]

QgsPropertyCollection::QgsPropertyCollection ( const QString & name = QString() )

Constructor for QgsPropertyCollection.

Parameters

name	collection name

Definition at line 120 of file qgspropertycollection.cpp.

◆ QgsPropertyCollection() [2/2]

QgsPropertyCollection::QgsPropertyCollection ( const QgsPropertyCollection & other )

Copy constructor.

Definition at line 124 of file qgspropertycollection.cpp.

Member Function Documentation

◆ clear()

void QgsPropertyCollection::clear ( )

overridevirtual

Removes all properties from the collection.

Implements QgsAbstractPropertyCollection.

Definition at line 178 of file qgspropertycollection.cpp.

◆ count()

int QgsPropertyCollection::count ( ) const

Returns the number of properties contained within the collection.

Definition at line 157 of file qgspropertycollection.cpp.

◆ hasActiveProperties()

bool QgsPropertyCollection::hasActiveProperties ( ) const

overridevirtual

Returns true if the collection has any active properties, or false if all properties within the collection are deactivated.

See also: hasDynamicProperties()

Implements QgsAbstractPropertyCollection.

Definition at line 304 of file qgspropertycollection.cpp.

◆ hasDynamicProperties()

bool QgsPropertyCollection::hasDynamicProperties ( ) const

overridevirtual

Returns true if the collection has any active, non-static properties, or false if either all non-static properties within the collection are deactivated or if the collection only contains static properties.

See also: hasActiveProperties()

Implements QgsAbstractPropertyCollection.

Definition at line 312 of file qgspropertycollection.cpp.

◆ hasProperty()

bool QgsPropertyCollection::hasProperty ( int key ) const

overridevirtual

Returns true if the collection contains a property with the specified key.

Parameters

key	integer key for property. The intended use case is that a context specific enum is cast to int and used for the key value.

See also: property()

Implements QgsAbstractPropertyCollection.

Definition at line 203 of file qgspropertycollection.cpp.

◆ isActive()

bool QgsPropertyCollection::isActive ( int key ) const

overridevirtual

Returns true if the collection contains an active property with the specified key.

Parameters

key	integer key for property to test. The intended use case is that a context specific enum is cast to int and used for the key value.

Implements QgsAbstractPropertyCollection.

Definition at line 268 of file qgspropertycollection.cpp.

◆ loadVariant()

bool QgsPropertyCollection::loadVariant	(	const QVariant &	configuration,
		const QgsPropertiesDefinition &	definitions
	)

overridevirtual

Loads this property collection from a QVariantMap, wrapped in a QVariant.

You can use QgsXmlUtils::readVariant to save it to an XML document.

See also: toVariant()

Implements QgsAbstractPropertyCollection.

Definition at line 341 of file qgspropertycollection.cpp.

◆ operator!=()

bool QgsPropertyCollection::operator!= ( const QgsPropertyCollection & other ) const

Definition at line 152 of file qgspropertycollection.cpp.

◆ operator=()

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

Definition at line 135 of file qgspropertycollection.cpp.

◆ operator==()

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

Definition at line 147 of file qgspropertycollection.cpp.

◆ prepare()

bool QgsPropertyCollection::prepare ( const QgsExpressionContext & context = QgsExpressionContext() ) const

overridevirtual

Prepares the collection against a specified expression context.

Calling prepare before evaluating the collection's properties multiple times allows precalculation of expensive setup tasks such as parsing expressions. Returns true if preparation was successful.

Implements QgsAbstractPropertyCollection.

Definition at line 240 of file qgspropertycollection.cpp.

◆ property() [1/2]

QgsProperty & QgsPropertyCollection::property ( int key )

virtual

Returns a reference to a matching property from the collection, if one exists.

Parameters

key	integer key for property to return. The intended use case is that a context specific enum is cast to int and used for the key value.

Returns: matching property, or null if no matching, active property found.

See also: hasProperty()

Definition at line 222 of file qgspropertycollection.cpp.

◆ property() [2/2]

QgsProperty QgsPropertyCollection::property ( int key ) const

overridevirtual

Returns a matching property from the collection, if one exists.

Parameters

key	integer key for property to return. The intended use case is that a context specific enum is cast to int and used for the key value.

Returns: matching property, or null if no matching, active property found.

See also: hasProperty()

Implements QgsAbstractPropertyCollection.

Definition at line 214 of file qgspropertycollection.cpp.

◆ propertyKeys()

QSet< int > QgsPropertyCollection::propertyKeys ( ) const

overridevirtual

Returns a list of property keys contained within the collection.

Implements QgsAbstractPropertyCollection.

Definition at line 166 of file qgspropertycollection.cpp.

◆ referencedFields()

QSet< QString > QgsPropertyCollection::referencedFields	(	const QgsExpressionContext &	context = `QgsExpressionContext()`,
		bool	ignoreContext = `false`
	)		const

overridevirtual

Returns the set of any fields referenced by the active properties from the collection.

Parameters

context	expression context the properties will be evaluated against.
ignoreContext	This parameter has been added in QGIS 3.14. When set to `true`, even fields not set in context's fields() will be reported - this is useful e.g. with vector tiles where the actual available field names may not be known beforehand.

Implements QgsAbstractPropertyCollection.

Definition at line 254 of file qgspropertycollection.cpp.

◆ setProperty() [1/2]

void QgsPropertyCollection::setProperty	(	int	key,
		const QgsProperty &	property
	)

Adds a property to the collection and takes ownership of it.

Parameters

key	integer key for property. Any existing property with the same key will be removed and replaced by this property. The intended use case is that a context specific enum is cast to int and used for the key value.
property	property to add. Ownership is transferred to the collection. Setting an invalid property will remove the property from the collection.

Definition at line 187 of file qgspropertycollection.cpp.

◆ setProperty() [2/2]

void QgsPropertyCollection::setProperty	(	int	key,
		const QVariant &	value
	)

Convenience method, creates a QgsStaticProperty and stores it within the collection.

Parameters

key	integer key for property. Any existing property with the same key will be deleted and replaced by this property. The intended use case is that a context specific enum is cast to int and used for the key value.
value	static value for property

Definition at line 197 of file qgspropertycollection.cpp.

◆ toVariant()

QVariant QgsPropertyCollection::toVariant ( const QgsPropertiesDefinition & definitions ) const

overridevirtual

Saves this property collection to a QVariantMap, wrapped in a QVariant.

You can use QgsXmlUtils::writeVariant to save it to an XML document.

See also: loadVariant()

Implements QgsAbstractPropertyCollection.

Definition at line 320 of file qgspropertycollection.cpp.

◆ value()

QVariant QgsPropertyCollection::value	(	int	key,
		const QgsExpressionContext &	context,
		const QVariant &	defaultValue = `QVariant()`
	)		const

overridevirtual

Returns the calculated value of the property with the specified key from within the collection.

If you need the validity of the value (like ok provided from the valueAs* variants) refer to the property() and QgsProperty::value()

Parameters

key	integer key for property to return. The intended use case is that a context specific enum is cast to int and used for the key value.
context	expression context to evaluate property against
defaultValue	default value to return if no matching, active property found or if the property value cannot be calculated

Returns: calculated property value, or default value if property could not be evaluated

See also: valueAsString(); valueAsColor(); valueAsDouble(); valueAsInt(); valueAsBool()

Implements QgsAbstractPropertyCollection.

Definition at line 228 of file qgspropertycollection.cpp.

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

/build/qgis-3.16.0+99unstable/src/core/qgspropertycollection.h
/build/qgis-3.16.0+99unstable/src/core/qgspropertycollection.cpp

Public Member Functions

Detailed Description

Constructor & Destructor Documentation

◆ QgsPropertyCollection() [1/2]

◆ QgsPropertyCollection() [2/2]

Member Function Documentation

◆ clear()

◆ count()

◆ hasActiveProperties()

◆ hasDynamicProperties()

◆ hasProperty()

◆ isActive()

◆ loadVariant()

◆ operator!=()

◆ operator=()

◆ operator==()

◆ prepare()

◆ property() [1/2]

◆ property() [2/2]

◆ propertyKeys()

◆ referencedFields()

◆ setProperty() [1/2]

◆ setProperty() [2/2]

◆ toVariant()

◆ value()