QgsLayerDefinition Class Reference

The QgsLayerDefinition class holds generic methods for loading/exporting QLR files. More...

#include <qgslayerdefinition.h>

Classes
class	DependencySorter
	Class used to work with layer dependencies stored in a XML project or layer definition file. More...

Static Public Member Functions
static bool	exportLayerDefinition (QDomDocument doc, const QList< QgsLayerTreeNode * > &selectedTreeNodes, QString &errorMessage, const QgsReadWriteContext &context)
	Export the selected layer tree nodes to a QLR-XML document. More...
static bool	exportLayerDefinition (QString path, const QList< QgsLayerTreeNode * > &selectedTreeNodes, QString &errorMessage)
	Export the selected layer tree nodes to a QLR file. More...
static QDomDocument	exportLayerDefinitionLayers (const QList< QgsMapLayer * > &layers, const QgsReadWriteContext &context)
	Returns the given layer as a layer definition document Layer definitions store the data source as well as styling and custom properties. More...
static bool	loadLayerDefinition (const QString &path, QgsProject *project, QgsLayerTreeGroup *rootGroup, QString &errorMessage)
	Loads the QLR at path into QGIS. New layers are added to given project into layer tree specified by rootGroup. More...
static bool	loadLayerDefinition (QDomDocument doc, QgsProject *project, QgsLayerTreeGroup *rootGroup, QString &errorMessage, QgsReadWriteContext &context)
	Loads the QLR from the XML document. New layers are added to given project into layer tree specified by rootGroup. More...
static QList< QgsMapLayer * >	loadLayerDefinitionLayers (const QString &qlrfile)
	Creates new layers from a layer definition file (.QLR) This is a low-level routine that does not resolve layer ID conflicts, dependencies and joins. More...
static QList< QgsMapLayer * >	loadLayerDefinitionLayers (QDomDocument &document, QgsReadWriteContext &context)
	Creates new layers from a layer definition document. More...

Detailed Description

The QgsLayerDefinition class holds generic methods for loading/exporting QLR files.

QLR files are an export of the layer xml including the style and datasource location. There is no link to the QLR file once loaded. Consider the QLR file a mini project file for layers and styles. QLR files also store the layer tree info for the exported layers, including group information.

Definition at line 42 of file qgslayerdefinition.h.

Member Function Documentation

exportLayerDefinition() [1/2]

bool QgsLayerDefinition::exportLayerDefinition ( QDomDocument  doc, const QList< QgsLayerTreeNode * > &  selectedTreeNodes, QString &  errorMessage, const QgsReadWriteContext &  context  )

static

Export the selected layer tree nodes to a QLR-XML document.

Definition at line 230 of file qgslayerdefinition.cpp.

exportLayerDefinition() [2/2]

bool QgsLayerDefinition::exportLayerDefinition ( QString  path, const QList< QgsLayerTreeNode * > &  selectedTreeNodes, QString &  errorMessage  )

static

Export the selected layer tree nodes to a QLR file.

Definition at line 204 of file qgslayerdefinition.cpp.

exportLayerDefinitionLayers()

QDomDocument QgsLayerDefinition::exportLayerDefinitionLayers ( const QList< QgsMapLayer * > &  layers, const QgsReadWriteContext &  context  )

static

Returns the given layer as a layer definition document Layer definitions store the data source as well as styling and custom properties.

Layer definitions can be used to load a layer and styling all from a single file.

This is a low-level routine that does not write layer tree.

See also

exportLayerDefinition()

Definition at line 263 of file qgslayerdefinition.cpp.

loadLayerDefinition() [1/2]

bool QgsLayerDefinition::loadLayerDefinition ( const QString &  path, QgsProject *  project, QgsLayerTreeGroup *  rootGroup, QString &  errorMessage  )

static

Loads the QLR at path into QGIS. New layers are added to given project into layer tree specified by rootGroup.

Definition at line 38 of file qgslayerdefinition.cpp.

loadLayerDefinition() [2/2]

bool QgsLayerDefinition::loadLayerDefinition ( QDomDocument  doc, QgsProject *  project, QgsLayerTreeGroup *  rootGroup, QString &  errorMessage, QgsReadWriteContext &  context  )

static

Loads the QLR from the XML document. New layers are added to given project into layer tree specified by rootGroup.

Definition at line 65 of file qgslayerdefinition.cpp.

loadLayerDefinitionLayers() [1/2]

QList< QgsMapLayer * > QgsLayerDefinition::loadLayerDefinitionLayers ( const QString &  qlrfile )

static

Creates new layers from a layer definition file (.QLR) This is a low-level routine that does not resolve layer ID conflicts, dependencies and joins.

See also

loadLayerDefinition()

Definition at line 355 of file qgslayerdefinition.cpp.

loadLayerDefinitionLayers() [2/2]

QList< QgsMapLayer * > QgsLayerDefinition::loadLayerDefinitionLayers ( QDomDocument &  document, QgsReadWriteContext &  context  )

static

Creates new layers from a layer definition document.

This is a low-level routine that does not resolve layer ID conflicts, dependencies and joins

See also

loadLayerDefinition()

Definition at line 280 of file qgslayerdefinition.cpp.

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

• /build/qgis-3.20.0+99unstable/src/core/qgslayerdefinition.h
• /build/qgis-3.20.0+99unstable/src/core/qgslayerdefinition.cpp