QGIS API Documentation 3.39.0-Master (67e056379ed)
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Public Types | Public Slots | Signals | Public Member Functions | Static Public Member Functions | Protected Member Functions | Protected Attributes | Properties | Friends | List of all members
QgsMapLayer Class Referenceabstract

Base class for all map layer types. More...

#include <qgsmaplayer.h>

Inheritance diagram for QgsMapLayer:
Inheritance graph
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Public Types

enum  LayerFlag { Identifiable = 1 << 0 , Removable = 1 << 1 , Searchable = 1 << 2 , Private = 1 << 3 }
 Flags for the map layer. More...
 
typedef QFlags< LayerFlagLayerFlags
 
enum  PropertyType { Style = 0 , Metadata }
 Maplayer has a style and a metadata property. More...
 
enum  ReadFlag { FlagDontResolveLayers = 1 << 0 , FlagTrustLayerMetadata = 1 << 1 , FlagReadExtentFromXml = 1 << 2 , FlagForceReadOnly = 1 << 3 }
 Flags which control project read behavior. More...
 
typedef QFlags< ReadFlagReadFlags
 
typedef QFlags< StyleCategoryStyleCategories
 
enum  StyleCategory {
  LayerConfiguration = 1 << 0 , Symbology = 1 << 1 , Symbology3D = 1 << 2 , Labeling = 1 << 3 ,
  Fields = 1 << 4 , Forms = 1 << 5 , Actions = 1 << 6 , MapTips = 1 << 7 ,
  Diagrams = 1 << 8 , AttributeTable = 1 << 9 , Rendering = 1 << 10 , CustomProperties = 1 << 11 ,
  GeometryOptions = 1 << 12 , Relations = 1 << 13 , Temporal = 1 << 14 , Legend = 1 << 15 ,
  Elevation = 1 << 16 , Notes = 1 << 17 , AllStyleCategories
}
 Categories of style to distinguish appropriate sections for import/export. More...
 

Public Slots

void emitStyleChanged ()
 Triggers an emission of the styleChanged() signal.
 
QgsProjectproject () const
 Returns the parent project if this map layer is added to a project.
 
virtual bool setDependencies (const QSet< QgsMapLayerDependency > &layers)
 Sets the list of dependencies.
 
void setMaximumScale (double scale)
 Sets the maximum map scale (i.e.
 
void setMinimumScale (double scale)
 Sets the minimum map scale (i.e.
 
void setRefreshOnNofifyMessage (const QString &message)
 Set the notification message that triggers repaint If refresh on notification is enabled, the notification will triggerRepaint only if the notification message is equal to.
 
void setRefreshOnNotifyEnabled (bool enabled)
 Set whether provider notification is connected to triggerRepaint.
 
void setScaleBasedVisibility (bool enabled)
 Sets whether scale based visibility is enabled for the layer.
 
virtual void setTransformContext (const QgsCoordinateTransformContext &transformContext)=0
 Sets the coordinate transform context to transformContext.
 
void trigger3DUpdate ()
 Will advise any 3D maps that this layer requires to be updated in the scene.
 
void triggerRepaint (bool deferredUpdate=false)
 Will advise the map canvas (and any other interested party) that this layer requires to be repainted.
 

Signals

void autoRefreshIntervalChanged (int interval)
 Emitted when the auto refresh interval changes.
 
void beforeResolveReferences (QgsProject *project)
 Emitted when all layers are loaded and references can be resolved, just before the references of this layer are resolved.
 
void blendModeChanged (QPainter::CompositionMode blendMode)
 Signal emitted when the blend mode is changed, through QgsMapLayer::setBlendMode()
 
void configChanged ()
 Emitted whenever the configuration is changed.
 
void crs3DChanged ()
 Emitted when the crs3D() of the layer has changed.
 
void crsChanged ()
 Emitted when the crs() of the layer has changed.
 
void customPropertyChanged (const QString &key)
 Emitted when a custom property of the layer has been changed or removed.
 
void dataChanged ()
 Data of layer changed.
 
void dataSourceChanged ()
 Emitted whenever the layer's data source has been changed.
 
void dependenciesChanged ()
 Emitted when dependencies are changed.
 
void editingStarted ()
 Emitted when editing on this layer has started.
 
void editingStopped ()
 Emitted when edited changes have been successfully written to the data provider.
 
void flagsChanged ()
 Emitted when layer's flags have been modified.
 
void idChanged (const QString &id)
 Emitted when the layer's ID has been changed.
 
void isValidChanged ()
 Emitted when the validity of this layer changed.
 
void layerModified ()
 Emitted when modifications has been done on layer.
 
void legendChanged ()
 Signal emitted when legend of the layer has changed.
 
void mapTipsEnabledChanged ()
 Emitted when map tips are enabled or disabled for the layer.
 
void mapTipTemplateChanged ()
 Emitted when the map tip template changes.
 
void metadataChanged ()
 Emitted when the layer's metadata is changed.
 
void nameChanged ()
 Emitted when the name has been changed.
 
void opacityChanged (double opacity)
 Emitted when the layer's opacity is changed, where opacity is a value between 0 (transparent) and 1 (opaque).
 
void recalculateExtents () const
 This is used to send a request that any mapcanvas using this layer update its extents.
 
void renderer3DChanged ()
 Signal emitted when 3D renderer associated with the layer has changed.
 
void rendererChanged ()
 Signal emitted when renderer is changed.
 
void repaintRequested (bool deferredUpdate=false)
 By emitting this signal the layer tells that either appearance or content have been changed and any view showing the rendered layer should refresh itself.
 
void request3DUpdate ()
 Signal emitted when a layer requires an update in any 3D maps.
 
void statusChanged (const QString &status)
 Emit a signal with status (e.g. to be caught by QgisApp and display a msg on status bar)
 
void styleChanged ()
 Signal emitted whenever a change affects the layer's style.
 
void styleLoaded (QgsMapLayer::StyleCategories categories)
 Emitted when a style has been loaded.
 
void verticalCrsChanged ()
 Emitted when the verticalCrs() of the layer has changed.
 
void willBeDeleted ()
 Emitted in the destructor when the layer is about to be deleted, but it is still in a perfectly valid state: the last chance for other pieces of code for some cleanup if they use the layer.
 

Public Member Functions

 QgsMapLayer (Qgis::LayerType type=Qgis::LayerType::Vector, const QString &name=QString(), const QString &source=QString())
 Constructor for QgsMapLayer.
 
 QgsMapLayer (QgsMapLayer const &)=delete
 QgsMapLayer cannot be copied.
 
 ~QgsMapLayer () override
 
Q_DECL_DEPRECATED QString abstract () const
 Returns the abstract of the layer used by QGIS Server in GetCapabilities request.
 
virtual bool accept (QgsStyleEntityVisitorInterface *visitor) const
 Accepts the specified symbology visitor, causing it to visit all symbols associated with the layer.
 
Q_DECL_DEPRECATED QString attribution () const
 Returns the attribution of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED QString attributionUrl () const
 Returns the attribution URL of the layer used by QGIS Server in GetCapabilities request.
 
int autoRefreshInterval () const
 Returns the auto refresh interval (in milliseconds).
 
Qgis::AutoRefreshMode autoRefreshMode () const
 Returns the layer's automatic refresh mode.
 
QPainter::CompositionMode blendMode () const
 Returns the current blending mode for a layer.
 
virtual QgsMapLayerclone () const =0
 Returns a new instance equivalent to this one except for the id which is still unique.
 
virtual QgsMapLayerRenderercreateMapRenderer (QgsRenderContext &rendererContext)=0
 Returns new instance of QgsMapLayerRenderer that will be used for rendering of given context.
 
QgsCoordinateReferenceSystem crs () const
 Returns the layer's spatial reference system.
 
QgsCoordinateReferenceSystem crs3D () const
 Returns the CRS to use for the layer when transforming 3D data, or when z/elevation value handling is important.
 
template<class T >
customEnumProperty (const QString &key, const T &defaultValue)
 Returns the property value for a property based on an enum.
 
template<class T >
customFlagProperty (const QString &key, const T &defaultValue)
 Returns the property value for a property based on a flag.
 
const QgsObjectCustomPropertiescustomProperties () const
 Read all custom properties from layer.
 
Q_INVOKABLE QVariant customProperty (const QString &value, const QVariant &defaultValue=QVariant()) const
 Read a custom property from layer.
 
Q_INVOKABLE QStringList customPropertyKeys () const
 Returns list of all keys within custom properties.
 
virtual Q_INVOKABLE QgsDataProviderdataProvider ()
 Returns the layer's data provider, it may be nullptr.
 
virtual const QgsDataProviderdataProvider () const
 Returns the layer's data provider in a const-correct manner, it may be nullptr.
 
Q_DECL_DEPRECATED QString dataUrl () const
 Returns the DataUrl of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED QString dataUrlFormat () const
 Returns the DataUrl format of the layer used by QGIS Server in GetCapabilities request.
 
virtual bool deleteStyleFromDatabase (const QString &styleId, QString &msgError)
 Deletes a style from the database.
 
virtual QSet< QgsMapLayerDependencydependencies () const
 Gets the list of dependencies.
 
virtual QgsMapLayerElevationPropertieselevationProperties ()
 Returns the layer's elevation properties.
 
virtual QgsError error () const
 Gets current status error.
 
void exportNamedMetadata (QDomDocument &doc, QString &errorMsg) const
 Export the current metadata of this layer as named metadata in a QDomDocument.
 
virtual void exportNamedStyle (QDomDocument &doc, QString &errorMsg, const QgsReadWriteContext &context=QgsReadWriteContext(), QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories) const
 Export the properties of this layer as named style in a QDomDocument.
 
virtual void exportSldStyle (QDomDocument &doc, QString &errorMsg) const
 Export the properties of this layer as SLD style in a QDomDocument.
 
virtual void exportSldStyleV2 (QDomDocument &doc, QString &errorMsg, const QgsSldExportContext &exportContext) const
 Export the properties of this layer as SLD style in a QDomDocument.
 
virtual QgsRectangle extent () const
 Returns the extent of the layer.
 
virtual QgsBox3D extent3D () const
 Returns the 3D extent of the layer.
 
QgsMapLayer::LayerFlags flags () const
 Returns the flags for this layer.
 
virtual QString getStyleFromDatabase (const QString &styleId, QString &msgError)
 Returns the named style corresponding to style id provided.
 
Q_DECL_DEPRECATED bool hasAutoRefreshEnabled () const
 Returns true if auto refresh is enabled for the layer.
 
virtual bool hasMapTips () const
 Returns true if the layer contains map tips.
 
bool hasScaleBasedVisibility () const
 Returns whether scale based visibility is enabled for the layer.
 
virtual QString htmlMetadata () const
 Obtain a formatted HTML string containing assorted metadata for this layer.
 
QString id () const
 Returns the layer's unique ID, which is used to access this layer from QgsProject.
 
bool importNamedMetadata (QDomDocument &document, QString &errorMessage)
 Import the metadata of this layer from a QDomDocument.
 
virtual bool importNamedStyle (QDomDocument &doc, QString &errorMsg, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
 Import the properties of this layer from a QDomDocument.
 
virtual bool isEditable () const
 Returns true if the layer can be edited.
 
bool isInScaleRange (double scale) const
 Tests whether the layer should be visible at the specified scale.
 
virtual bool isModified () const
 Returns true if the layer has been modified since last commit/save.
 
bool isRefreshOnNotifyEnabled () const
 Returns true if the refresh on provider nofification is enabled.
 
virtual bool isSpatial () const
 Returns true if the layer is considered a spatial layer, ie it has some form of geometry associated with it.
 
virtual bool isTemporary () const
 Returns true if the layer is considered a temporary layer.
 
bool isValid () const
 Returns the status of the layer.
 
Q_DECL_DEPRECATED QString keywordList () const
 Returns the keyword list of the layer used by QGIS Server in GetCapabilities request.
 
QgsMapLayerLegendlegend () const
 Can be nullptr.
 
QString legendPlaceholderImage () const
 Returns path to the placeholder image or an empty string if a generated legend is shown.
 
QString legendUrl () const
 Returns the URL for the layer's legend.
 
QString legendUrlFormat () const
 Returns the format for a URL based layer legend.
 
virtual int listStylesInDatabase (QStringList &ids, QStringList &names, QStringList &descriptions, QString &msgError)
 Lists all the style in db split into related to the layer and not related to.
 
virtual QString loadDefaultMetadata (bool &resultFlag)
 Retrieve the default metadata for this layer if one exists (either as a .qmd file on disk or as a record in the users metadata table in their personal qgis.db)
 
virtual QString loadDefaultStyle (bool &resultFlag)
 Retrieve the default style for this layer if one exists (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)
 
virtual QString loadNamedMetadata (const QString &uri, bool &resultFlag)
 Retrieve a named metadata for this layer if one exists (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)
 
bool loadNamedMetadataFromDatabase (const QString &db, const QString &uri, QString &qmd)
 Retrieve a named metadata for this layer from a sqlite database.
 
virtual QString loadNamedStyle (const QString &theURI, bool &resultFlag, bool loadFromLocalDb, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories, Qgis::LoadStyleFlags flags=Qgis::LoadStyleFlags())
 Loads a named style from file/local db/datasource db.
 
virtual QString loadNamedStyle (const QString &uri, bool &resultFlag, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories, Qgis::LoadStyleFlags flags=Qgis::LoadStyleFlags())
 Retrieve a named style for this layer if one exists (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)
 
virtual bool loadNamedStyleFromDatabase (const QString &db, const QString &uri, QString &qml)
 Retrieve a named style for this layer from a sqlite database.
 
virtual QString loadSldStyle (const QString &uri, bool &resultFlag)
 Attempts to style the layer using the formatting from an SLD type file.
 
bool mapTipsEnabled () const
 Returns true if map tips are enabled for this layer.
 
QString mapTipTemplate () const
 The mapTip is a pretty, html representation for feature information.
 
double maximumScale () const
 Returns the maximum map scale (i.e.
 
virtual const QgsLayerMetadatametadata () const
 Returns a reference to the layer's metadata store.
 
virtual QString metadataUri () const
 Retrieve the metadata URI for this layer (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)
 
Q_DECL_DEPRECATED QString metadataUrl () const
 Returns the metadata URL of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED QString metadataUrlFormat () const
 Returns the metadata format of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED QString metadataUrlType () const
 Returns the metadata type of the layer used by QGIS Server in GetCapabilities request.
 
double minimumScale () const
 Returns the minimum map scale (i.e.
 
QString name () const
 Returns the display name of the layer.
 
virtual double opacity () const
 Returns the opacity for the layer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).
 
QgsMapLayeroperator= (QgsMapLayer const &)=delete
 QgsMapLayer cannot be copied.
 
QString originalXmlProperties () const
 Returns the XML properties of the original layer as they were when the layer was first read from the project file.
 
virtual Qgis::MapLayerProperties properties () const
 Returns the map layer properties of this layer.
 
QString providerType () const
 Returns the provider type (provider key) for this layer.
 
QString publicSource (bool hidePassword=false) const
 Gets a version of the internal layer definition that has sensitive bits removed (for example, the password).
 
bool readLayerXml (const QDomElement &layerElement, QgsReadWriteContext &context, QgsMapLayer::ReadFlags flags=QgsMapLayer::ReadFlags(), QgsDataProvider *preloadedProvider=nullptr)
 Sets state from DOM document.
 
bool readOnly () const
 Returns if this layer is read only.
 
virtual bool readSld (const QDomNode &node, QString &errorMessage)
 
virtual bool readStyle (const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories)
 Read the style for the current layer from the DOM node supplied.
 
virtual bool readSymbology (const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories)=0
 Read the symbology for the current layer from the DOM node supplied.
 
QString refreshOnNotifyMessage () const
 Returns the message that should be notified by the provider to triggerRepaint.
 
virtual Q_INVOKABLE void reload ()
 Synchronises with changes in the datasource.
 
void removeCustomProperty (const QString &key)
 Remove a custom property from layer.
 
QgsAbstract3DRendererrenderer3D () const
 Returns 3D renderer associated with the layer.
 
virtual void resolveReferences (QgsProject *project)
 Resolve references to other layers (kept as layer IDs after reading XML) into layer objects.
 
virtual QString saveDefaultMetadata (bool &resultFlag)
 Save the current metadata of this layer as the default metadata (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)
 
virtual Q_DECL_DEPRECATED QString saveDefaultStyle (bool &resultFlag)
 Save the properties of this layer as the default style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)
 
virtual QString saveDefaultStyle (bool &resultFlag, StyleCategories categories)
 Save the properties of this layer as the default style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)
 
QString saveNamedMetadata (const QString &uri, bool &resultFlag)
 Save the current metadata of this layer as a named metadata (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)
 
virtual QString saveNamedStyle (const QString &uri, bool &resultFlag, StyleCategories categories=AllStyleCategories)
 Save the properties of this layer as a named style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)
 
virtual QString saveSldStyle (const QString &uri, bool &resultFlag) const
 Saves the properties of this layer to an SLD format file.
 
virtual QString saveSldStyleV2 (bool &resultFlag, const QgsSldExportContext &exportContext) const
 Saves the properties of this layer to an SLD format file.
 
virtual void saveStyleToDatabase (const QString &name, const QString &description, bool useAsDefault, const QString &uiFileContent, QString &msgError, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
 Saves named and sld style of the layer to the style table in the db.
 
virtual QgsMapLayerSelectionPropertiesselectionProperties ()
 Returns the layer's selection properties.
 
QgsMapLayerServerPropertiesserverProperties ()
 Returns QGIS Server Properties for the map layer.
 
const QgsMapLayerServerPropertiesserverProperties () const
 Returns QGIS Server Properties const for the map layer.
 
Q_DECL_DEPRECATED void setAbstract (const QString &abstract)
 Sets the abstract of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED void setAttribution (const QString &attrib)
 Sets the attribution of the layerused by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED void setAttributionUrl (const QString &attribUrl)
 Sets the attribution URL of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED void setAutoRefreshEnabled (bool enabled)
 Sets whether auto refresh is enabled for the layer.
 
void setAutoRefreshInterval (int interval)
 Sets the auto refresh interval (in milliseconds) for the layer.
 
void setAutoRefreshMode (Qgis::AutoRefreshMode mode)
 Sets the automatic refresh mode for the layer.
 
void setBlendMode (QPainter::CompositionMode blendMode)
 Set the blending mode used for rendering a layer.
 
void setCrs (const QgsCoordinateReferenceSystem &srs, bool emitSignal=true)
 Sets layer's spatial reference system.
 
template<class T >
void setCustomEnumProperty (const QString &key, const T &value)
 Set the value of a property based on an enum.
 
template<class T >
void setCustomFlagProperty (const QString &key, const T &value)
 Set the value of a property based on a flag.
 
void setCustomProperties (const QgsObjectCustomProperties &properties)
 Set custom properties for layer.
 
Q_INVOKABLE void setCustomProperty (const QString &key, const QVariant &value)
 Set a custom property for layer.
 
void setDataSource (const QString &dataSource, const QString &baseName, const QString &provider, bool loadDefaultStyleFlag=false)
 Updates the data source of the layer.
 
void setDataSource (const QString &dataSource, const QString &baseName, const QString &provider, const QgsDataProvider::ProviderOptions &options, bool loadDefaultStyleFlag=false)
 Updates the data source of the layer.
 
void setDataSource (const QString &dataSource, const QString &baseName, const QString &provider, const QgsDataProvider::ProviderOptions &options, QgsDataProvider::ReadFlags flags)
 Updates the data source of the layer.
 
Q_DECL_DEPRECATED void setDataUrl (const QString &dataUrl)
 Sets the DataUrl of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED void setDataUrlFormat (const QString &dataUrlFormat)
 Sets the DataUrl format of the layer used by QGIS Server in GetCapabilities request.
 
void setFlags (QgsMapLayer::LayerFlags flags)
 Returns the flags for this layer.
 
bool setId (const QString &id)
 Sets the layer's id.
 
Q_DECL_DEPRECATED void setKeywordList (const QString &keywords)
 Sets the keyword list of the layerused by QGIS Server in GetCapabilities request.
 
virtual void setLayerOrder (const QStringList &layers)
 Reorders the previously selected sublayers of this layer from bottom to top.
 
void setLegend (QgsMapLayerLegend *legend)
 Assign a legend controller to the map layer.
 
void setLegendPlaceholderImage (const QString &imgPath)
 Set placeholder image for legend.
 
void setLegendUrl (const QString &legendUrl)
 Sets the URL for the layer's legend.
 
void setLegendUrlFormat (const QString &legendUrlFormat)
 Sets the format for a URL based layer legend.
 
void setMapTipsEnabled (bool enabled)
 Enable or disable map tips for this layer.
 
void setMapTipTemplate (const QString &mapTipTemplate)
 The mapTip is a pretty, html representation for feature information.
 
virtual void setMetadata (const QgsLayerMetadata &metadata)
 Sets the layer's metadata store.
 
Q_DECL_DEPRECATED void setMetadataUrl (const QString &metaUrl)
 Sets the metadata URL of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED void setMetadataUrlFormat (const QString &metaUrlFormat)
 Sets the metadata format of the layer used by QGIS Server in GetCapabilities request.
 
Q_DECL_DEPRECATED void setMetadataUrlType (const QString &metaUrlType)
 Set the metadata type of the layer used by QGIS Server in GetCapabilities request MetadataUrlType indicates the standard to which the metadata complies.
 
void setName (const QString &name)
 Set the display name of the layer.
 
virtual void setOpacity (double opacity)
 Sets the opacity for the layer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).
 
void setOriginalXmlProperties (const QString &originalXmlProperties)
 Sets the original XML properties for the layer to originalXmlProperties.
 
void setRenderer3D (QgsAbstract3DRenderer *renderer)
 Sets 3D renderer for the layer.
 
Q_DECL_DEPRECATED void setShortName (const QString &shortName)
 Sets the short name of the layer used by QGIS Server to identify the layer.
 
virtual void setSubLayerVisibility (const QString &name, bool visible)
 Set the visibility of the given sublayer name.
 
Q_DECL_DEPRECATED void setTitle (const QString &title)
 Sets the title of the layer used by QGIS Server in GetCapabilities request.
 
bool setVerticalCrs (const QgsCoordinateReferenceSystem &crs, QString *errorMessage=nullptr)
 Sets the layer's vertical coordinate reference system.
 
Q_DECL_DEPRECATED QString shortName () const
 Returns the short name of the layer used by QGIS Server to identify the layer.
 
QString source () const
 Returns the source for the layer.
 
QgsMapLayerStyleManagerstyleManager () const
 Gets access to the layer's style manager.
 
virtual QString styleURI () const
 Retrieve the style URI for this layer (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)
 
virtual QStringList subLayers () const
 Returns the sublayers of this layer.
 
virtual bool supportsEditing () const
 Returns whether the layer supports editing or not.
 
virtual QgsMapLayerTemporalPropertiestemporalProperties ()
 Returns the layer's temporal properties.
 
virtual QDateTime timestamp () const
 Time stamp of data source in the moment when data/metadata were loaded by provider.
 
Q_DECL_DEPRECATED QString title () const
 Returns the title of the layer used by QGIS Server in GetCapabilities request.
 
QgsCoordinateTransformContext transformContext () const
 Returns the layer data provider coordinate transform context or a default transform context if the layer does not have a valid data provider.
 
Qgis::LayerType type () const
 Returns the type of the layer.
 
QUndoStack * undoStack ()
 Returns pointer to layer's undo stack.
 
QUndoStack * undoStackStyles ()
 Returns pointer to layer's style undo stack.
 
QgsCoordinateReferenceSystem verticalCrs () const
 Returns the layer's vertical coordinate reference system.
 
QgsRectangle wgs84Extent (bool forceRecalculate=false) const
 Returns the WGS84 extent (EPSG:4326) of the layer according to ReadFlag::FlagTrustLayerMetadata.
 
bool writeLayerXml (QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context) const
 Stores state in DOM node.
 
virtual bool writeStyle (QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const
 Write just the symbology information for the layer into the document.
 
virtual bool writeSymbology (QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const =0
 Write the style for the layer into the document provided.
 

Static Public Member Functions

static QString extensionPropertyType (PropertyType type)
 Returns the extension of a Property.
 
static QString formatLayerName (const QString &name)
 A convenience function to capitalize and format a layer name.
 
static QString generateId (const QString &layerName)
 Generates an unique identifier for this layer, the generate ID is prefixed by layerName.
 
static QgsDataProvider::ReadFlags providerReadFlags (const QDomNode &layerNode, QgsMapLayer::ReadFlags layerReadFlags)
 Returns provider read flag deduced from layer read flags layerReadFlags and a dom node layerNode that describes a layer (corresponding to `‘maplayer’' tag in a DOM document project file read by QgsProject).
 

Protected Member Functions

void appendError (const QgsErrorMessage &error)
 Add error message.
 
void clone (QgsMapLayer *layer) const
 Copies attributes like name, short name, ... into another layer.
 
QString crsHtmlMetadata () const
 Returns a HTML fragment containing the layer's CRS metadata, for use in the htmlMetadata() method.
 
virtual QString decodedSource (const QString &source, const QString &dataProvider, const QgsReadWriteContext &context) const
 Called by readLayerXML(), used by derived classes to decode provider's specific data source from project files.
 
virtual QString encodedSource (const QString &source, const QgsReadWriteContext &context) const
 Called by writeLayerXML(), used by derived classes to encode provider's specific data source to project files.
 
QString generalHtmlMetadata () const
 Returns an HTML fragment containing general metadata information, for use in the htmlMetadata() method.
 
Q_DECL_DEPRECATED bool hasDependencyCycle (const QSet< QgsMapLayerDependency > &) const
 Checks whether a new set of dependencies will introduce a cycle this method is now deprecated and always return false, because circular dependencies are now correctly managed.
 
void invalidateWgs84Extent ()
 Invalidates the WGS84 extent.
 
void readCommonStyle (const QDomElement &layerElement, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories)
 Read style data common to all layer types.
 
void readCustomProperties (const QDomNode &layerNode, const QString &keyStartsWith=QString())
 Read custom properties from project file.
 
void readStyleManager (const QDomNode &layerNode)
 Read style manager's configuration (if any). To be called by subclasses.
 
virtual bool readXml (const QDomNode &layer_node, QgsReadWriteContext &context)
 Called by readLayerXML(), used by children to read state specific to them from project files.
 
void setError (const QgsError &error)
 Sets error message.
 
virtual void setExtent (const QgsRectangle &rect)
 Sets the extent.
 
virtual void setExtent3D (const QgsBox3D &box)
 Sets the extent.
 
void setProviderType (const QString &providerType)
 Sets the providerType (provider key)
 
void setValid (bool valid)
 Sets whether layer is valid or not.
 
void writeCommonStyle (QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const
 Write style data common to all layer types.
 
void writeCustomProperties (QDomNode &layerNode, QDomDocument &doc) const
 Write custom properties to project file.
 
void writeStyleManager (QDomNode &layerNode, QDomDocument &doc) const
 Write style manager's configuration (if exists). To be called by subclasses.
 
virtual bool writeXml (QDomNode &layer_node, QDomDocument &document, const QgsReadWriteContext &context) const
 Called by writeLayerXML(), used by children to write state specific to them to project files.
 

Protected Attributes

int mBlockStyleChangedSignal = 0
 If non-zero, the styleChanged signal should not be emitted.
 
QString mDataSource
 Data source description string, varies by layer type.
 
QSet< QgsMapLayerDependencymDependencies
 List of layers that may modify this layer on modification.
 
QgsError mError
 Error.
 
bool mIsRefreshOnNofifyEnabled = false
 
QString mLayerName
 Name of the layer - used for display.
 
double mLayerOpacity = 1.0
 Layer opacity.
 
QString mLegendUrl
 WMS legend.
 
QString mLegendUrlFormat
 
std::unique_ptr< QgsDataProvidermPreloadedProvider
 Optionally used when loading a project, it is released when the layer is effectively created.
 
QString mProviderKey
 Data provider key (name of the data provider)
 
QgsMapLayer::ReadFlags mReadFlags = QgsMapLayer::ReadFlags()
 Read flags. It's up to the subclass to respect these when restoring state from XML.
 
QString mRefreshOnNofifyMessage
 
bool mShouldValidateCrs = true
 true if the layer's CRS should be validated and invalid CRSes are not permitted.
 
bool mValid = false
 Indicates if the layer is valid and can be drawn.
 

Properties

int autoRefreshInterval
 
QgsCoordinateReferenceSystem crs
 
QgsCoordinateReferenceSystem crs3D
 
QString id
 
bool isValid
 
bool mapTipsEnabled
 
QString mapTipTemplate
 
QgsLayerMetadata metadata
 
QString name
 
double opacity
 
Qgis::LayerType type
 
QgsCoordinateReferenceSystem verticalCrs
 

Friends

class QgsVectorLayer
 
class TestQgsMapLayer
 
class TestQgsProject
 

Detailed Description

Base class for all map layer types.

This is the base class for all map layer types (vector, raster).

Definition at line 74 of file qgsmaplayer.h.

Member Typedef Documentation

◆ LayerFlags

Definition at line 160 of file qgsmaplayer.h.

◆ ReadFlags

typedef QFlags< ReadFlag > QgsMapLayer::ReadFlags

Definition at line 651 of file qgsmaplayer.h.

◆ StyleCategories

Definition at line 191 of file qgsmaplayer.h.

Member Enumeration Documentation

◆ LayerFlag

Flags for the map layer.

Note
Flags are options specified by the user used for the UI but are not preventing any API call.
Since
QGIS 3.4
Enumerator
Identifiable 

If the layer is identifiable using the identify map tool and as a WMS layer.

Removable 

If the layer can be removed from the project. The layer will not be removable from the legend menu entry but can still be removed with an API call.

Searchable 

Only for vector-layer, determines if the layer is used in the 'search all layers' locator.

Private 

Determines if the layer is meant to be exposed to the GUI, i.e. visible in the layer legend tree.

Definition at line 152 of file qgsmaplayer.h.

◆ PropertyType

Maplayer has a style and a metadata property.

Enumerator
Style 
Metadata 

Definition at line 141 of file qgsmaplayer.h.

◆ ReadFlag

Flags which control project read behavior.

Since
QGIS 3.10
Enumerator
FlagDontResolveLayers 

Don't resolve layer paths or create data providers for layers.

FlagTrustLayerMetadata 

Trust layer metadata. Improves layer load time by skipping expensive checks like primary key unicity, geometry type and srid and by using estimated metadata on layer load. Since QGIS 3.16.

FlagReadExtentFromXml 

Read extent from xml and skip get extent from provider.

FlagForceReadOnly 

Force open as read only.

Definition at line 644 of file qgsmaplayer.h.

◆ StyleCategory

Categories of style to distinguish appropriate sections for import/export.

Since
QGIS 3.4
Enumerator
LayerConfiguration 

General configuration: identifiable, removable, searchable, display expression, read-only.

Symbology 

Symbology.

Symbology3D 

3D symbology

Labeling 

Labeling.

Fields 

Aliases, widgets, WMS/WFS, expressions, constraints, virtual fields.

Forms 

Feature form.

Actions 

Actions.

MapTips 

Map tips.

Diagrams 

Diagrams.

AttributeTable 

Attribute table settings: choice and order of columns, conditional styling.

Rendering 

Rendering: scale visibility, simplify method, opacity.

CustomProperties 

Custom properties (by plugins for instance)

GeometryOptions 

Geometry validation configuration.

Relations 

Relations.

Temporal 

Temporal properties (since QGIS 3.14)

Legend 

Legend settings (since QGIS 3.16)

Elevation 

Elevation settings (since QGIS 3.18)

Notes 

Layer user notes (since QGIS 3.20)

AllStyleCategories 

Definition at line 167 of file qgsmaplayer.h.

Constructor & Destructor Documentation

◆ QgsMapLayer() [1/2]

QgsMapLayer::QgsMapLayer ( Qgis::LayerType  type = Qgis::LayerType::Vector,
const QString &  name = QString(),
const QString &  source = QString() 
)

Constructor for QgsMapLayer.

Parameters
typelayer type
namedisplay name for the layer
sourcedatasource of layer

Definition at line 83 of file qgsmaplayer.cpp.

◆ ~QgsMapLayer()

QgsMapLayer::~QgsMapLayer ( )
override

Definition at line 115 of file qgsmaplayer.cpp.

◆ QgsMapLayer() [2/2]

QgsMapLayer::QgsMapLayer ( QgsMapLayer const &  )
delete

QgsMapLayer cannot be copied.

Member Function Documentation

◆ abstract()

QString QgsMapLayer::abstract ( ) const

Returns the abstract of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->abstract() instead.

Definition at line 292 of file qgsmaplayer.cpp.

◆ accept()

bool QgsMapLayer::accept ( QgsStyleEntityVisitorInterface visitor) const
virtual

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

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

Since
QGIS 3.10

Reimplemented in QgsRasterLayer.

Definition at line 2972 of file qgsmaplayer.cpp.

◆ appendError()

void QgsMapLayer::appendError ( const QgsErrorMessage error)
inlineprotected

Add error message.

Definition at line 2252 of file qgsmaplayer.h.

◆ attribution()

QString QgsMapLayer::attribution ( ) const

Returns the attribution of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->attribution() instead.

Definition at line 348 of file qgsmaplayer.cpp.

◆ attributionUrl()

QString QgsMapLayer::attributionUrl ( ) const

Returns the attribution URL of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->attributionUrl() instead.

Definition at line 362 of file qgsmaplayer.cpp.

◆ autoRefreshInterval()

int QgsMapLayer::autoRefreshInterval ( ) const

Returns the auto refresh interval (in milliseconds).

Note that auto refresh is only active when hasAutoRefreshEnabled() is true.

See also
hasAutoRefreshEnabled()
setAutoRefreshInterval()

Definition at line 1176 of file qgsmaplayer.cpp.

◆ autoRefreshIntervalChanged

void QgsMapLayer::autoRefreshIntervalChanged ( int  interval)
signal

Emitted when the auto refresh interval changes.

See also
setAutoRefreshInterval()

◆ autoRefreshMode()

Qgis::AutoRefreshMode QgsMapLayer::autoRefreshMode ( ) const

Returns the layer's automatic refresh mode.

See also
autoRefreshInterval()
setAutoRefreshMode()
Since
QGIS 3.34

Definition at line 1169 of file qgsmaplayer.cpp.

◆ beforeResolveReferences

void QgsMapLayer::beforeResolveReferences ( QgsProject project)
signal

Emitted when all layers are loaded and references can be resolved, just before the references of this layer are resolved.

Since
QGIS 3.10

◆ blendMode()

QPainter::CompositionMode QgsMapLayer::blendMode ( ) const

Returns the current blending mode for a layer.

See also
setBlendMode()

Definition at line 512 of file qgsmaplayer.cpp.

◆ blendModeChanged

void QgsMapLayer::blendModeChanged ( QPainter::CompositionMode  blendMode)
signal

Signal emitted when the blend mode is changed, through QgsMapLayer::setBlendMode()

◆ clone() [1/2]

virtual QgsMapLayer * QgsMapLayer::clone ( ) const
pure virtual

Returns a new instance equivalent to this one except for the id which is still unique.

Returns
a new layer instance

Implemented in QgsAnnotationLayer, QgsMeshLayer, QgsPointCloudLayer, QgsAuxiliaryLayer, QgsGroupLayer, QgsRasterLayer, QgsTiledSceneLayer, QgsVectorLayer, QgsVectorTileLayer, and QgsPluginLayer.

◆ clone() [2/2]

void QgsMapLayer::clone ( QgsMapLayer layer) const
protected

Copies attributes like name, short name, ... into another layer.

Parameters
layerThe copy recipient

Definition at line 127 of file qgsmaplayer.cpp.

◆ configChanged

void QgsMapLayer::configChanged ( )
signal

Emitted whenever the configuration is changed.

The project listens to this signal to be marked as dirty.

◆ createMapRenderer()

virtual QgsMapLayerRenderer * QgsMapLayer::createMapRenderer ( QgsRenderContext rendererContext)
pure virtual

Returns new instance of QgsMapLayerRenderer that will be used for rendering of given context.

Implemented in QgsVectorLayer, QgsAnnotationLayer, QgsMeshLayer, QgsPointCloudLayer, QgsGroupLayer, QgsRasterLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

◆ crs()

QgsCoordinateReferenceSystem QgsMapLayer::crs ( ) const

Returns the layer's spatial reference system.

Warning
Since QGIS 3.38, consider using crs3D() whenever transforming 3D data or whenever z/elevation value handling is important.
See also
setCrs()
crs3D()
verticalCrs()
crsChanged()

Definition at line 1302 of file qgsmaplayer.cpp.

◆ crs3D()

QgsCoordinateReferenceSystem QgsMapLayer::crs3D ( ) const

Returns the CRS to use for the layer when transforming 3D data, or when z/elevation value handling is important.

The returned CRS will take into account verticalCrs() when appropriate, e.g. it may return a compound CRS consisting of crs() + verticalCrs(). This method may still return a 2D CRS, e.g in the case that crs() is a 2D CRS and no verticalCrs() has been set for the layer. Check QgsCoordinateReferenceSystem::type() on the returned value to determine the type of CRS returned by this method.

Warning
It is NOT guaranteed that the returned CRS will actually be a 3D CRS, but rather it is guaranteed that the returned CRS is ALWAYS the most appropriate CRS to use when handling 3D data.
See also
crs()
verticalCrs()
crs3DChanged()
Since
QGIS 3.38

Definition at line 1339 of file qgsmaplayer.cpp.

◆ crs3DChanged

void QgsMapLayer::crs3DChanged ( )
signal

Emitted when the crs3D() of the layer has changed.

See also
crs3D()
crsChanged()
verticalCrsChanged()
Since
QGIS 3.38

◆ crsChanged

void QgsMapLayer::crsChanged ( )
signal

Emitted when the crs() of the layer has changed.

See also
crs()
setCrs()
verticalCrsChanged()
crs3DChanged()

◆ crsHtmlMetadata()

QString QgsMapLayer::crsHtmlMetadata ( ) const
protected

Returns a HTML fragment containing the layer's CRS metadata, for use in the htmlMetadata() method.

Note
Not available in Python bindings.
Since
QGIS 3.20

Definition at line 3310 of file qgsmaplayer.cpp.

◆ customEnumProperty()

template<class T >
T QgsMapLayer::customEnumProperty ( const QString &  key,
const T &  defaultValue 
)
inline

Returns the property value for a property based on an enum.

This forces the output to be a valid and existing entry of the enum. Hence if the property value is incorrect, the given default value is returned. This tries first with property as a string (as the enum) and then as an integer value.

Note
The enum needs to be declared with Q_ENUM, and flags with Q_FLAG (not Q_FLAGS).
See also
setCustomEnumProperty
customFlagProperty
Since
QGIS 3.22

Definition at line 804 of file qgsmaplayer.h.

◆ customFlagProperty()

template<class T >
T QgsMapLayer::customFlagProperty ( const QString &  key,
const T &  defaultValue 
)
inline

Returns the property value for a property based on a flag.

This forces the output to be a valid and existing entry of the flag. Hence if the property value is incorrect, the given default value is returned. This tries first with property as a string (using a byte array) and then as an integer value.

Note
The flag needs to be declared with Q_FLAG (not Q_FLAGS).
for Python bindings, a custom implementation is achieved in Python directly.
See also
setCustomFlagProperty
customEnumProperty
Since
QGIS 3.22

Definition at line 882 of file qgsmaplayer.h.

◆ customProperties()

const QgsObjectCustomProperties & QgsMapLayer::customProperties ( ) const

Read all custom properties from layer.

Properties are stored in a map and saved in project file.

See also
setCustomProperties
Since
QGIS 3.14

Definition at line 2634 of file qgsmaplayer.cpp.

◆ customProperty()

QVariant QgsMapLayer::customProperty ( const QString &  value,
const QVariant &  defaultValue = QVariant() 
) const

Read a custom property from layer.

Properties are stored in a map and saved in project file.

See also
setCustomProperty()

Definition at line 2641 of file qgsmaplayer.cpp.

◆ customPropertyChanged

void QgsMapLayer::customPropertyChanged ( const QString &  key)
signal

Emitted when a custom property of the layer has been changed or removed.

Since
QGIS 3.18

◆ customPropertyKeys()

QStringList QgsMapLayer::customPropertyKeys ( ) const

Returns list of all keys within custom properties.

Properties are stored in a map and saved in project file.

See also
customProperty()

Definition at line 2605 of file qgsmaplayer.cpp.

◆ dataChanged

void QgsMapLayer::dataChanged ( )
signal

Data of layer changed.

◆ dataProvider() [1/2]

QgsDataProvider * QgsMapLayer::dataProvider ( )
virtual

Returns the layer's data provider, it may be nullptr.

Reimplemented in QgsVectorLayer, QgsAnnotationLayer, QgsMeshLayer, QgsPointCloudLayer, QgsGroupLayer, QgsPluginLayer, QgsRasterLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

Definition at line 243 of file qgsmaplayer.cpp.

◆ dataProvider() [2/2]

const QgsDataProvider * QgsMapLayer::dataProvider ( ) const
virtual

Returns the layer's data provider in a const-correct manner, it may be nullptr.

Note
not available in Python bindings

Reimplemented in QgsVectorLayer, QgsAnnotationLayer, QgsMeshLayer, QgsPointCloudLayer, QgsGroupLayer, QgsPluginLayer, QgsRasterLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

Definition at line 250 of file qgsmaplayer.cpp.

◆ dataSourceChanged

void QgsMapLayer::dataSourceChanged ( )
signal

Emitted whenever the layer's data source has been changed.

See also
setDataSource()
Since
QGIS 3.5

◆ dataUrl()

QString QgsMapLayer::dataUrl ( ) const

Returns the DataUrl of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->dataUrl() instead.

Definition at line 320 of file qgsmaplayer.cpp.

◆ dataUrlFormat()

QString QgsMapLayer::dataUrlFormat ( ) const

Returns the DataUrl format of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->dataUrlFormat() instead.

Definition at line 334 of file qgsmaplayer.cpp.

◆ decodedSource()

QString QgsMapLayer::decodedSource ( const QString &  source,
const QString &  dataProvider,
const QgsReadWriteContext context 
) const
protectedvirtual

Called by readLayerXML(), used by derived classes to decode provider's specific data source from project files.

Typically resolving absolute or relative paths, usernames and passwords or drivers prefixes ("HDF5:")

Parameters
sourcedata source to decode, typically read from layer's DOM element "datasource"
dataProviderstring identification of data provider (e.g. "ogr"), typically read from layer's DOM element
contextreading context (e.g. for conversion between relative and absolute paths)
Returns
decoded source, typically to be used as the layer's datasource
Since
QGIS 3.2

Reimplemented in QgsPointCloudLayer, QgsTiledSceneLayer, QgsVectorLayer, QgsVectorTileLayer, QgsMeshLayer, and QgsRasterLayer.

Definition at line 994 of file qgsmaplayer.cpp.

◆ deleteStyleFromDatabase()

bool QgsMapLayer::deleteStyleFromDatabase ( const QString &  styleId,
QString &  msgError 
)
virtual

Deletes a style from the database.

Parameters
styleIdthe provider's layer_styles table id of the style to delete
msgErrorwill be set to a descriptive error message if any occurs
Returns
true in case of success

Definition at line 2674 of file qgsmaplayer.cpp.

◆ dependencies()

QSet< QgsMapLayerDependency > QgsMapLayer::dependencies ( ) const
virtual

Gets the list of dependencies.

This includes data dependencies set by the user (

See also
setDataDependencies) as well as dependencies given by the provider
Returns
a set of QgsMapLayerDependency

Reimplemented in QgsVectorLayer.

Definition at line 2993 of file qgsmaplayer.cpp.

◆ dependenciesChanged

void QgsMapLayer::dependenciesChanged ( )
signal

Emitted when dependencies are changed.

◆ editingStarted

void QgsMapLayer::editingStarted ( )
signal

Emitted when editing on this layer has started.

Since
QGIS 3.22 in the QgsMapLayer base class

◆ editingStopped

void QgsMapLayer::editingStopped ( )
signal

Emitted when edited changes have been successfully written to the data provider.

Since
QGIS 3.22 in the QgsMapLayer base class

◆ elevationProperties()

virtual QgsMapLayerElevationProperties * QgsMapLayer::elevationProperties ( )
inlinevirtual

Returns the layer's elevation properties.

This may be nullptr, depending on the layer type.

Since
QGIS 3.18

Reimplemented in QgsMeshLayer, QgsPointCloudLayer, QgsRasterLayer, QgsTiledSceneLayer, and QgsVectorLayer.

Definition at line 1736 of file qgsmaplayer.h.

◆ emitStyleChanged

void QgsMapLayer::emitStyleChanged ( )
slot

Triggers an emission of the styleChanged() signal.

Definition at line 2914 of file qgsmaplayer.cpp.

◆ encodedSource()

QString QgsMapLayer::encodedSource ( const QString &  source,
const QgsReadWriteContext context 
) const
protectedvirtual

Called by writeLayerXML(), used by derived classes to encode provider's specific data source to project files.

Typically resolving absolute or relative paths, usernames and passwords or drivers prefixes ("HDF5:")

Parameters
sourcedata source to encode, typically QgsMapLayer::source()
contextwriting context (e.g. for conversion between relative and absolute paths)
Returns
encoded source, typically to be written in the DOM element "datasource"
Since
QGIS 3.2

Reimplemented in QgsVectorLayer, QgsVectorTileLayer, QgsMeshLayer, QgsPointCloudLayer, QgsRasterLayer, and QgsTiledSceneLayer.

Definition at line 986 of file qgsmaplayer.cpp.

◆ error()

QgsError QgsMapLayer::error ( ) const
virtual

Gets current status error.

This error describes some principal problem for which layer cannot work and thus is not valid. It is not last error after accessing data by draw() etc.

Definition at line 2753 of file qgsmaplayer.cpp.

◆ exportNamedMetadata()

void QgsMapLayer::exportNamedMetadata ( QDomDocument &  doc,
QString &  errorMsg 
) const

Export the current metadata of this layer as named metadata in a QDomDocument.

Parameters
docthe target QDomDocument
errorMsgthis QString will be initialized on error

Definition at line 1825 of file qgsmaplayer.cpp.

◆ exportNamedStyle()

void QgsMapLayer::exportNamedStyle ( QDomDocument &  doc,
QString &  errorMsg,
const QgsReadWriteContext context = QgsReadWriteContext(),
QgsMapLayer::StyleCategories  categories = QgsMapLayer::AllStyleCategories 
) const
virtual

Export the properties of this layer as named style in a QDomDocument.

Parameters
docthe target QDomDocument
errorMsgthis QString will be initialized on error
contextread write context
categoriesthe style categories to export during the execution of writeSymbology

Definition at line 1846 of file qgsmaplayer.cpp.

◆ exportSldStyle()

void QgsMapLayer::exportSldStyle ( QDomDocument &  doc,
QString &  errorMsg 
) const
virtual

Export the properties of this layer as SLD style in a QDomDocument.

Parameters
docthe target QDomDocument
errorMsgthis QString will be initialized on error during the execution of writeSymbology
See also
exportSldStyleV2()

Definition at line 2161 of file qgsmaplayer.cpp.

◆ exportSldStyleV2()

void QgsMapLayer::exportSldStyleV2 ( QDomDocument &  doc,
QString &  errorMsg,
const QgsSldExportContext exportContext 
) const
virtual

Export the properties of this layer as SLD style in a QDomDocument.

Parameters
docthe target QDomDocument
errorMsgthis QString will be initialized on error during the execution of writeSymbology
exportContextSLD export context
Since
QGIS 3.30

Definition at line 2167 of file qgsmaplayer.cpp.

◆ extensionPropertyType()

QString QgsMapLayer::extensionPropertyType ( QgsMapLayer::PropertyType  type)
static

Returns the extension of a Property.

Returns
The extension

Definition at line 70 of file qgsmaplayer.cpp.

◆ extent()

QgsRectangle QgsMapLayer::extent ( ) const
virtual

Returns the extent of the layer.

Reimplemented in QgsVectorLayer, QgsAnnotationLayer, QgsMeshLayer, QgsPointCloudLayer, QgsGroupLayer, and QgsTiledSceneLayer.

Definition at line 486 of file qgsmaplayer.cpp.

◆ extent3D()

QgsBox3D QgsMapLayer::extent3D ( ) const
virtual

Returns the 3D extent of the layer.

Since
QGIS 3.36

Reimplemented in QgsVectorLayer.

Definition at line 493 of file qgsmaplayer.cpp.

◆ flags()

QgsMapLayer::LayerFlags QgsMapLayer::flags ( ) const

Returns the flags for this layer.

Note
Flags are options specified by the user used for the UI but are not preventing any API call. For instance, even if the Removable flag is not set, the layer can still be removed with the API but the action will not be listed in the legend menu.
See also
properties()
Since
QGIS 3.4

Definition at line 172 of file qgsmaplayer.cpp.

◆ flagsChanged

void QgsMapLayer::flagsChanged ( )
signal

Emitted when layer's flags have been modified.

See also
setFlags()
flags()
Since
QGIS 3.4

◆ formatLayerName()

QString QgsMapLayer::formatLayerName ( const QString &  name)
static

A convenience function to capitalize and format a layer name.

Definition at line 1481 of file qgsmaplayer.cpp.

◆ generalHtmlMetadata()

QString QgsMapLayer::generalHtmlMetadata ( ) const
protected

Returns an HTML fragment containing general metadata information, for use in the htmlMetadata() method.

Note
Not available in Python bindings.
Since
QGIS 3.22

Definition at line 3203 of file qgsmaplayer.cpp.

◆ generateId()

QString QgsMapLayer::generateId ( const QString &  layerName)
static

Generates an unique identifier for this layer, the generate ID is prefixed by layerName.

Since
QGIS 3.8

Definition at line 2955 of file qgsmaplayer.cpp.

◆ getStyleFromDatabase()

QString QgsMapLayer::getStyleFromDatabase ( const QString &  styleId,
QString &  msgError 
)
virtual

Returns the named style corresponding to style id provided.

Definition at line 2667 of file qgsmaplayer.cpp.

◆ hasAutoRefreshEnabled()

bool QgsMapLayer::hasAutoRefreshEnabled ( ) const

Returns true if auto refresh is enabled for the layer.

See also
autoRefreshInterval()
setAutoRefreshEnabled()
Deprecated:
use autoRefreshMode() instead.

Definition at line 1162 of file qgsmaplayer.cpp.

◆ hasDependencyCycle()

Q_DECL_DEPRECATED bool QgsMapLayer::hasDependencyCycle ( const QSet< QgsMapLayerDependency > &  ) const
inlineprotected

Checks whether a new set of dependencies will introduce a cycle this method is now deprecated and always return false, because circular dependencies are now correctly managed.

Deprecated:
since QGIS 3.10

Definition at line 2288 of file qgsmaplayer.h.

◆ hasMapTips()

bool QgsMapLayer::hasMapTips ( ) const
virtual

Returns true if the layer contains map tips.

See also
mapTipTemplate()
setMapTipTemplate()

Reimplemented in QgsVectorLayer.

Definition at line 2979 of file qgsmaplayer.cpp.

◆ hasScaleBasedVisibility()

bool QgsMapLayer::hasScaleBasedVisibility ( ) const

Returns whether scale based visibility is enabled for the layer.

Returns
true if scale based visibility is enabled
See also
minimumScale()
maximumScale()
setScaleBasedVisibility()
isInScaleRange()

Definition at line 1154 of file qgsmaplayer.cpp.

◆ htmlMetadata()

QString QgsMapLayer::htmlMetadata ( ) const
virtual

Obtain a formatted HTML string containing assorted metadata for this layer.

Reimplemented in QgsVectorLayer, QgsAnnotationLayer, QgsMeshLayer, QgsPointCloudLayer, QgsGroupLayer, QgsRasterLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

Definition at line 2900 of file qgsmaplayer.cpp.

◆ id()

QString QgsMapLayer::id ( ) const

Returns the layer's unique ID, which is used to access this layer from QgsProject.

See also
setId()
idChanged()

Definition at line 197 of file qgsmaplayer.cpp.

◆ idChanged

void QgsMapLayer::idChanged ( const QString &  id)
signal

Emitted when the layer's ID has been changed.

See also
id()
setId()
Since
QGIS 3.38

◆ importNamedMetadata()

bool QgsMapLayer::importNamedMetadata ( QDomDocument &  document,
QString &  errorMessage 
)

Import the metadata of this layer from a QDomDocument.

Parameters
documentsource QDomDocument
errorMessagethis QString will be initialized on error
Returns
true on success

Definition at line 1767 of file qgsmaplayer.cpp.

◆ importNamedStyle()

bool QgsMapLayer::importNamedStyle ( QDomDocument &  doc,
QString &  errorMsg,
QgsMapLayer::StyleCategories  categories = QgsMapLayer::AllStyleCategories 
)
virtual

Import the properties of this layer from a QDomDocument.

Parameters
docsource QDomDocument
errorMsgthis QString will be initialized on error during the execution of readSymbology
categoriesthe style categories to import
Returns
true on success

Definition at line 1781 of file qgsmaplayer.cpp.

◆ invalidateWgs84Extent()

void QgsMapLayer::invalidateWgs84Extent ( )
protected

Invalidates the WGS84 extent.

If FlagTrustLayerMetadata is enabled, the extent is not invalidated because we want to trust metadata whatever happens.

Since
QGIS 3.20

Definition at line 3192 of file qgsmaplayer.cpp.

◆ isEditable()

bool QgsMapLayer::isEditable ( ) const
virtual

Returns true if the layer can be edited.

Reimplemented in QgsVectorLayer, QgsAnnotationLayer, and QgsMeshLayer.

Definition at line 2760 of file qgsmaplayer.cpp.

◆ isInScaleRange()

bool QgsMapLayer::isInScaleRange ( double  scale) const

Tests whether the layer should be visible at the specified scale.

The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map.

Returns
true if the layer is visible at the given scale.
See also
minimumScale()
maximumScale()
hasScaleBasedVisibility()

Definition at line 1144 of file qgsmaplayer.cpp.

◆ isModified()

bool QgsMapLayer::isModified ( ) const
virtual

Returns true if the layer has been modified since last commit/save.

Note
default implementation returns false.
Since
QGIS 3.22 in the base class QgsMapLayer.

Reimplemented in QgsMeshLayer, and QgsVectorLayer.

Definition at line 2767 of file qgsmaplayer.cpp.

◆ isRefreshOnNotifyEnabled()

bool QgsMapLayer::isRefreshOnNotifyEnabled ( ) const
inline

Returns true if the refresh on provider nofification is enabled.

Definition at line 1679 of file qgsmaplayer.h.

◆ isSpatial()

bool QgsMapLayer::isSpatial ( ) const
virtual

Returns true if the layer is considered a spatial layer, ie it has some form of geometry associated with it.

Reimplemented in QgsVectorLayer, and QgsRasterLayer.

Definition at line 2774 of file qgsmaplayer.cpp.

◆ isTemporary()

bool QgsMapLayer::isTemporary ( ) const
virtual

Returns true if the layer is considered a temporary layer.

These include memory-only layers such as those created by the "memory" data provider, layers stored inside a local temporary folder (such as the "/tmp" folder on Linux) or layer with temporary data (as temporary mesh layer dataset)

Since
QGIS 3.10.1

Definition at line 2781 of file qgsmaplayer.cpp.

◆ isValid()

bool QgsMapLayer::isValid ( ) const

Returns the status of the layer.

An invalid layer is one which has a bad datasource or other problem. Child classes set this flag when initialized.

Returns
true if the layer is valid and can be accessed

Definition at line 1128 of file qgsmaplayer.cpp.

◆ isValidChanged

void QgsMapLayer::isValidChanged ( )
signal

Emitted when the validity of this layer changed.

Since
QGIS 3.16

◆ keywordList()

QString QgsMapLayer::keywordList ( ) const

Returns the keyword list of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->keywordList() instead.

Definition at line 306 of file qgsmaplayer.cpp.

◆ layerModified

void QgsMapLayer::layerModified ( )
signal

Emitted when modifications has been done on layer.

Since
QGIS 3.22 in the QgsMapLayer base class

◆ legend()

QgsMapLayerLegend * QgsMapLayer::legend ( ) const

Can be nullptr.

Definition at line 2838 of file qgsmaplayer.cpp.

◆ legendChanged

void QgsMapLayer::legendChanged ( )
signal

Signal emitted when legend of the layer has changed.

◆ legendPlaceholderImage()

QString QgsMapLayer::legendPlaceholderImage ( ) const
inline

Returns path to the placeholder image or an empty string if a generated legend is shown.

Returns
placeholder image path
Since
QGIS 3.22

Definition at line 1743 of file qgsmaplayer.h.

◆ legendUrl()

QString QgsMapLayer::legendUrl ( ) const
inline

Returns the URL for the layer's legend.

Definition at line 1505 of file qgsmaplayer.h.

◆ legendUrlFormat()

QString QgsMapLayer::legendUrlFormat ( ) const
inline

Returns the format for a URL based layer legend.

Definition at line 1515 of file qgsmaplayer.h.

◆ listStylesInDatabase()

int QgsMapLayer::listStylesInDatabase ( QStringList &  ids,
QStringList &  names,
QStringList &  descriptions,
QString &  msgError 
)
virtual

Lists all the style in db split into related to the layer and not related to.

Parameters
idsthe list in which will be stored the style db ids
namesthe list in which will be stored the style names
descriptionsthe list in which will be stored the style descriptions
msgErrorwill be set to a descriptive error message if any occurs
Returns
the number of styles related to current layer (-1 on not implemented)
Note
Since QGIS 3.2 Styles related to the layer are ordered with the default style first then by update time for Postgres, MySQL and Spatialite.

Definition at line 2660 of file qgsmaplayer.cpp.

◆ loadDefaultMetadata()

QString QgsMapLayer::loadDefaultMetadata ( bool &  resultFlag)
virtual

Retrieve the default metadata for this layer if one exists (either as a .qmd file on disk or as a record in the users metadata table in their personal qgis.db)

Parameters
resultFlaga reference to a flag that will be set to false if we did not manage to load the default metadata.
Returns
a QString with any status messages

Reimplemented in QgsTiledSceneLayer, and QgsVectorTileLayer.

Definition at line 1570 of file qgsmaplayer.cpp.

◆ loadDefaultStyle()

QString QgsMapLayer::loadDefaultStyle ( bool &  resultFlag)
virtual

Retrieve the default style for this layer if one exists (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

Parameters
resultFlaga reference to a flag that will be set to false if we did not manage to load the default style.
Returns
a QString with any status messages
See also
loadNamedStyle()

Reimplemented in QgsMeshLayer, QgsPointCloudLayer, QgsTiledSceneLayer, QgsVectorLayer, and QgsVectorTileLayer.

Definition at line 1584 of file qgsmaplayer.cpp.

◆ loadNamedMetadata()

QString QgsMapLayer::loadNamedMetadata ( const QString &  uri,
bool &  resultFlag 
)
virtual

Retrieve a named metadata for this layer if one exists (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

Parameters
uri- the file name or other URI for the metadata file. First an attempt will be made to see if this is a file and load that, if that fails the qgis.db metadata table will be consulted to see if there is a metadata who's key matches the URI.
resultFlaga reference to a flag that will be set to false if we did not manage to load the default metadata.
Returns
a QString with any status messages

Definition at line 1906 of file qgsmaplayer.cpp.

◆ loadNamedMetadataFromDatabase()

bool QgsMapLayer::loadNamedMetadataFromDatabase ( const QString &  db,
const QString &  uri,
QString &  qmd 
)

Retrieve a named metadata for this layer from a sqlite database.

Parameters
dbpath to sqlite database
uriuri for table
qmdwill be set to QMD xml metadata content from database
Returns
true if style was successfully loaded

Definition at line 1591 of file qgsmaplayer.cpp.

◆ loadNamedStyle() [1/2]

QString QgsMapLayer::loadNamedStyle ( const QString &  theURI,
bool &  resultFlag,
bool  loadFromLocalDb,
QgsMapLayer::StyleCategories  categories = QgsMapLayer::AllStyleCategories,
Qgis::LoadStyleFlags  flags = Qgis::LoadStyleFlags() 
)
virtual

Loads a named style from file/local db/datasource db.

Parameters
theURIthe URI of the style or the URI of the layer
resultFlagwill be set to true if a named style is correctly loaded
loadFromLocalDbif true forces to load from local db instead of datasource one
categoriesthe style categories to be loaded.
flagsflags controlling how the style should be loaded (since QGIS 3.38)

Definition at line 2708 of file qgsmaplayer.cpp.

◆ loadNamedStyle() [2/2]

QString QgsMapLayer::loadNamedStyle ( const QString &  uri,
bool &  resultFlag,
QgsMapLayer::StyleCategories  categories = QgsMapLayer::AllStyleCategories,
Qgis::LoadStyleFlags  flags = Qgis::LoadStyleFlags() 
)
virtual

Retrieve a named style for this layer if one exists (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

Parameters
uri- the file name or other URI for the style file. First an attempt will be made to see if this is a file and load that, if that fails the qgis.db styles table will be consulted to see if there is a style who's key matches the URI.
resultFlaga reference to a flag that will be set to false if we did not manage to load the default style.
categoriesthe style categories to be loaded.
flagsflags controlling how the style should be loaded (since QGIS 3.38)
Returns
a QString with any status messages
See also
loadDefaultStyle()

Definition at line 1658 of file qgsmaplayer.cpp.

◆ loadNamedStyleFromDatabase()

bool QgsMapLayer::loadNamedStyleFromDatabase ( const QString &  db,
const QString &  uri,
QString &  qml 
)
virtual

Retrieve a named style for this layer from a sqlite database.

Parameters
dbpath to sqlite database
uriuri for table
qmlwill be set to QML style content from database
Returns
true if style was successfully loaded

Definition at line 1598 of file qgsmaplayer.cpp.

◆ loadSldStyle()

QString QgsMapLayer::loadSldStyle ( const QString &  uri,
bool &  resultFlag 
)
virtual

Attempts to style the layer using the formatting from an SLD type file.

Parameters
uriuri of source SLD file
resultFlaga reference to a flag that will be set to false if the SLD file could not be loaded
Returns
a string with any status or error messages
See also
saveSldStyle()

Definition at line 2336 of file qgsmaplayer.cpp.

◆ mapTipsEnabled()

bool QgsMapLayer::mapTipsEnabled ( ) const

Returns true if map tips are enabled for this layer.

Since
QGIS 3.32

Definition at line 1089 of file qgsmaplayer.cpp.

◆ mapTipsEnabledChanged

void QgsMapLayer::mapTipsEnabledChanged ( )
signal

Emitted when map tips are enabled or disabled for the layer.

See also
setMapTipsEnabled()
Since
QGIS 3.32

◆ mapTipTemplate()

QString QgsMapLayer::mapTipTemplate ( ) const

The mapTip is a pretty, html representation for feature information.

It may also contain embedded expressions.

Since
QGIS 3.30

Definition at line 1060 of file qgsmaplayer.cpp.

◆ mapTipTemplateChanged

void QgsMapLayer::mapTipTemplateChanged ( )
signal

Emitted when the map tip template changes.

Since
QGIS 3.30

◆ maximumScale()

double QgsMapLayer::maximumScale ( ) const

Returns the maximum map scale (i.e.

most "zoomed in" scale) at which the layer will be visible. The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale of 0 indicates no maximum scale visibility.

Note
Scale based visibility is only used if setScaleBasedVisibility() is set to true.
See also
setMaximumScale()
minimumScale()
hasScaleBasedVisibility()
isInScaleRange()

Definition at line 1245 of file qgsmaplayer.cpp.

◆ metadata()

const QgsLayerMetadata & QgsMapLayer::metadata ( ) const
virtual

Returns a reference to the layer's metadata store.

See also
setMetadata()
metadataChanged()

Definition at line 1231 of file qgsmaplayer.cpp.

◆ metadataChanged

void QgsMapLayer::metadataChanged ( )
signal

Emitted when the layer's metadata is changed.

See also
setMetadata()
metadata()

◆ metadataUri()

QString QgsMapLayer::metadataUri ( ) const
virtual

Retrieve the metadata URI for this layer (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

Returns
a QString with the metadata file name

Definition at line 1534 of file qgsmaplayer.cpp.

◆ metadataUrl()

QString QgsMapLayer::metadataUrl ( ) const

Returns the metadata URL of the layer used by QGIS Server in GetCapabilities request.

MetadataUrl is a a link to the detailed, standardized metadata about the data. Since QGIS 3.22, it returns the first metadata URL link.

Returns
the layer metadata URL
See also
serverProperties()
Deprecated:
since QGIS 3.22

Definition at line 389 of file qgsmaplayer.cpp.

◆ metadataUrlFormat()

QString QgsMapLayer::metadataUrlFormat ( ) const

Returns the metadata format of the layer used by QGIS Server in GetCapabilities request.

MetadataUrlType indicates how the metadata is structured. Since QGIS 3.22, it returns the first metadata URL format.

Returns
the layer metadata format
See also
serverProperties()
Deprecated:
since QGIS 3.22

Definition at line 455 of file qgsmaplayer.cpp.

◆ metadataUrlType()

QString QgsMapLayer::metadataUrlType ( ) const

Returns the metadata type of the layer used by QGIS Server in GetCapabilities request.

MetadataUrlType indicates the standard to which the metadata complies. Since QGIS 3.22, it returns the first metadata URL type.

Returns
the layer metadata type
See also
serverProperties()
Deprecated:
since QGIS 3.22

Definition at line 422 of file qgsmaplayer.cpp.

◆ minimumScale()

double QgsMapLayer::minimumScale ( ) const

Returns the minimum map scale (i.e.

most "zoomed out" scale) at which the layer will be visible. The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale of 0 indicates no minimum scale visibility.

Note
Scale based visibility is only used if setScaleBasedVisibility() is set to true.
See also
setMinimumScale()
maximumScale()
hasScaleBasedVisibility()
isInScaleRange()

Definition at line 1266 of file qgsmaplayer.cpp.

◆ name()

QString QgsMapLayer::name ( ) const

Returns the display name of the layer.

See also
setName()

Definition at line 234 of file qgsmaplayer.cpp.

◆ nameChanged

void QgsMapLayer::nameChanged ( )
signal

Emitted when the name has been changed.

◆ opacity()

double QgsMapLayer::opacity ( ) const
virtual

Returns the opacity for the layer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).

See also
setOpacity()
opacityChanged()
Note
Prior to QGIS 3.18, this method was available for vector layers only
Since
QGIS 3.18

Reimplemented in QgsRasterLayer.

Definition at line 531 of file qgsmaplayer.cpp.

◆ opacityChanged

void QgsMapLayer::opacityChanged ( double  opacity)
signal

Emitted when the layer's opacity is changed, where opacity is a value between 0 (transparent) and 1 (opaque).

See also
setOpacity()
opacity()
Note
Prior to QGIS 3.18, this signal was available for vector layers only
Since
QGIS 3.18

◆ operator=()

QgsMapLayer & QgsMapLayer::operator= ( QgsMapLayer const &  )
delete

QgsMapLayer cannot be copied.

◆ originalXmlProperties()

QString QgsMapLayer::originalXmlProperties ( ) const

Returns the XML properties of the original layer as they were when the layer was first read from the project file.

In case of new layers this is normally empty.

The storage format for the XML is qlr

Since
QGIS 3.6

Definition at line 2941 of file qgsmaplayer.cpp.

◆ project

QgsProject * QgsMapLayer::project ( ) const
slot

Returns the parent project if this map layer is added to a project.

Otherwise returns nullptr

Since
QGIS 3.18

Definition at line 3039 of file qgsmaplayer.cpp.

◆ properties()

Qgis::MapLayerProperties QgsMapLayer::properties ( ) const
virtual

Returns the map layer properties of this layer.

Note
properties() differ from flags() in that flags() are user settable, and reflect options that users can enable for map layers. In contrast properties() are reflections of inherent capabilities for the layer, which cannot be directly changed by users.
Since
QGIS 3.22

Reimplemented in QgsAnnotationLayer, QgsRasterLayer, and QgsVectorTileLayer.

Definition at line 190 of file qgsmaplayer.cpp.

◆ providerReadFlags()

QgsDataProvider::ReadFlags QgsMapLayer::providerReadFlags ( const QDomNode &  layerNode,
QgsMapLayer::ReadFlags  layerReadFlags 
)
static

Returns provider read flag deduced from layer read flags layerReadFlags and a dom node layerNode that describes a layer (corresponding to `‘maplayer’' tag in a DOM document project file read by QgsProject).

This static method is used when loading a project.

Since
QGIS 3.32

Definition at line 1096 of file qgsmaplayer.cpp.

◆ providerType()

QString QgsMapLayer::providerType ( ) const

Returns the provider type (provider key) for this layer.

Definition at line 2490 of file qgsmaplayer.cpp.

◆ publicSource()

QString QgsMapLayer::publicSource ( bool  hidePassword = false) const

Gets a version of the internal layer definition that has sensitive bits removed (for example, the password).

This function should be used when displaying the source name for general viewing.

Parameters
hidePasswordFalse, if the password should be removed or replaced by an arbitrary string, since QGIS 3.34
See also
source()

Definition at line 469 of file qgsmaplayer.cpp.

◆ readCommonStyle()

void QgsMapLayer::readCommonStyle ( const QDomElement &  layerElement,
const QgsReadWriteContext context,
QgsMapLayer::StyleCategories  categories = AllStyleCategories 
)
protected

Read style data common to all layer types.

Definition at line 2497 of file qgsmaplayer.cpp.

◆ readCustomProperties()

void QgsMapLayer::readCustomProperties ( const QDomNode &  layerNode,
const QString &  keyStartsWith = QString() 
)
protected

Read custom properties from project file.

Parameters
layerNodenote to read from
keyStartsWithreads only properties starting with the specified string (or all if the string is empty)

Definition at line 1013 of file qgsmaplayer.cpp.

◆ readLayerXml()

bool QgsMapLayer::readLayerXml ( const QDomElement &  layerElement,
QgsReadWriteContext context,
QgsMapLayer::ReadFlags  flags = QgsMapLayer::ReadFlags(),
QgsDataProvider preloadedProvider = nullptr 
)

Sets state from DOM document.

Parameters
layerElementThe DOM element corresponding to `‘maplayer’' tag
contextwriting context (e.g. for conversion between relative and absolute paths)
flagsoptional argument which can be used to control layer reading behavior.
preloadedProvideroptional preloaded data provider that will be used as data provider for this layer, takes ownership (since QGIS 3.32)
Note

The DOM node corresponds to a DOM document project file XML element read by QgsProject.

This, in turn, calls readXml() (and then readSymbology()), which is overridable by sub-classes so that they can read their own specific state from the given DOM node.

Invoked by QgsProject::read().

Returns
true if successful

Definition at line 539 of file qgsmaplayer.cpp.

◆ readOnly()

bool QgsMapLayer::readOnly ( ) const
inline

Returns if this layer is read only.

Definition at line 533 of file qgsmaplayer.h.

◆ readSld()

virtual bool QgsMapLayer::readSld ( const QDomNode &  node,
QString &  errorMessage 
)
inlinevirtual

Reimplemented in QgsVectorLayer.

Definition at line 1335 of file qgsmaplayer.h.

◆ readStyle()

bool QgsMapLayer::readStyle ( const QDomNode &  node,
QString &  errorMessage,
QgsReadWriteContext context,
QgsMapLayer::StyleCategories  categories = AllStyleCategories 
)
virtual

Read the style for the current layer from the DOM node supplied.

Parameters
nodenode that will contain the style definition for this layer.
errorMessagereference to string that will be updated with any error messages
contextreading context (used for transform from relative to absolute paths)
categoriesthe style categories to be read
Returns
true in case of success.
Note
To be implemented in subclasses. Default implementation does nothing and returns false.

Reimplemented in QgsVectorLayer, QgsRasterLayer, QgsAnnotationLayer, QgsPointCloudLayer, QgsTiledSceneLayer, and QgsMeshLayer.

Definition at line 2397 of file qgsmaplayer.cpp.

◆ readStyleManager()

void QgsMapLayer::readStyleManager ( const QDomNode &  layerNode)
protected

Read style manager's configuration (if any). To be called by subclasses.

Definition at line 1037 of file qgsmaplayer.cpp.

◆ readSymbology()

virtual bool QgsMapLayer::readSymbology ( const QDomNode &  node,
QString &  errorMessage,
QgsReadWriteContext context,
StyleCategories  categories = AllStyleCategories 
)
pure virtual

Read the symbology for the current layer from the DOM node supplied.

Parameters
nodenode that will contain the symbology definition for this layer.
errorMessagereference to string that will be updated with any error messages
contextreading context (used for transform from relative to absolute paths)
categoriesthe style categories to be read
Returns
true in case of success.

Implemented in QgsVectorLayer, QgsMeshLayer, QgsRasterLayer, QgsAnnotationLayer, QgsPointCloudLayer, QgsGroupLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

◆ readXml()

bool QgsMapLayer::readXml ( const QDomNode &  layer_node,
QgsReadWriteContext context 
)
protectedvirtual

Called by readLayerXML(), used by children to read state specific to them from project files.

Reimplemented in QgsVectorLayer, QgsMeshLayer, QgsRasterLayer, QgsAnnotationLayer, QgsPointCloudLayer, QgsGroupLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

Definition at line 708 of file qgsmaplayer.cpp.

◆ recalculateExtents

void QgsMapLayer::recalculateExtents ( ) const
signal

This is used to send a request that any mapcanvas using this layer update its extents.

◆ refreshOnNotifyMessage()

QString QgsMapLayer::refreshOnNotifyMessage ( ) const
inline

Returns the message that should be notified by the provider to triggerRepaint.

Definition at line 1673 of file qgsmaplayer.h.

◆ reload()

virtual Q_INVOKABLE void QgsMapLayer::reload ( )
inlinevirtual

Synchronises with changes in the datasource.

Reimplemented in QgsVectorLayer, QgsMeshLayer, and QgsRasterLayer.

Definition at line 538 of file qgsmaplayer.h.

◆ removeCustomProperty()

void QgsMapLayer::removeCustomProperty ( const QString &  key)

Remove a custom property from layer.

Properties are stored in a map and saved in project file.

See also
setCustomProperty()

Definition at line 2649 of file qgsmaplayer.cpp.

◆ renderer3D()

QgsAbstract3DRenderer * QgsMapLayer::renderer3D ( ) const

Returns 3D renderer associated with the layer.

May be nullptr.

Definition at line 2866 of file qgsmaplayer.cpp.

◆ renderer3DChanged

void QgsMapLayer::renderer3DChanged ( )
signal

Signal emitted when 3D renderer associated with the layer has changed.

◆ rendererChanged

void QgsMapLayer::rendererChanged ( )
signal

Signal emitted when renderer is changed.

See also
styleChanged()

◆ repaintRequested

void QgsMapLayer::repaintRequested ( bool  deferredUpdate = false)
signal

By emitting this signal the layer tells that either appearance or content have been changed and any view showing the rendered layer should refresh itself.

If deferredUpdate is true then the layer will only be repainted when the canvas is next re-rendered, and will not trigger any canvas redraws itself.

◆ request3DUpdate

void QgsMapLayer::request3DUpdate ( )
signal

Signal emitted when a layer requires an update in any 3D maps.

Since
QGIS 3.18

◆ resolveReferences()

void QgsMapLayer::resolveReferences ( QgsProject project)
virtual

Resolve references to other layers (kept as layer IDs after reading XML) into layer objects.

Reimplemented in QgsVectorLayer, and QgsGroupLayer.

Definition at line 1003 of file qgsmaplayer.cpp.

◆ saveDefaultMetadata()

QString QgsMapLayer::saveDefaultMetadata ( bool &  resultFlag)
virtual

Save the current metadata of this layer as the default metadata (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

Parameters
resultFlaga reference to a flag that will be set to false if we did not manage to save the default metadata.
Returns
a QString with any status messages

Definition at line 1541 of file qgsmaplayer.cpp.

◆ saveDefaultStyle() [1/2]

QString QgsMapLayer::saveDefaultStyle ( bool &  resultFlag)
virtual

Save the properties of this layer as the default style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

Parameters
resultFlaga reference to a flag that will be set to false if we did not manage to save the default style.
Returns
a QString with any status messages
See also
loadNamedStyle()
saveNamedStyle()
Deprecated:
since QGIS 3.26

Definition at line 1885 of file qgsmaplayer.cpp.

◆ saveDefaultStyle() [2/2]

QString QgsMapLayer::saveDefaultStyle ( bool &  resultFlag,
StyleCategories  categories 
)
virtual

Save the properties of this layer as the default style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

Parameters
resultFlaga reference to a flag that will be set to false if we did not manage to save the default style.
categoriesthe style categories to be saved (since QGIS 3.26)
Returns
a QString with any status messages
See also
loadNamedStyle()
saveNamedStyle()

Definition at line 1892 of file qgsmaplayer.cpp.

◆ saveNamedMetadata()

QString QgsMapLayer::saveNamedMetadata ( const QString &  uri,
bool &  resultFlag 
)

Save the current metadata of this layer as a named metadata (either as a .qmd file on disk or as a record in the users style table in their personal qgis.db)

Parameters
urithe file name or other URI for the metadata file. First an attempt will be made to see if this is a file and save to that, if that fails the qgis.db metadata table will be used to create a metadata entry who's key matches the URI.
resultFlaga reference to a flag that will be set to false if we did not manage to save the default metadata.
Returns
a QString with any status messages

Definition at line 1899 of file qgsmaplayer.cpp.

◆ saveNamedStyle()

QString QgsMapLayer::saveNamedStyle ( const QString &  uri,
bool &  resultFlag,
StyleCategories  categories = AllStyleCategories 
)
virtual

Save the properties of this layer as a named style (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

Parameters
urithe file name or other URI for the style file. First an attempt will be made to see if this is a file and save to that, if that fails the qgis.db styles table will be used to create a style entry who's key matches the URI.
resultFlaga reference to a flag that will be set to false if we did not manage to save the default style.
categoriesthe style categories to be saved.
Returns
a QString with any status messages
See also
saveDefaultStyle()

Definition at line 2154 of file qgsmaplayer.cpp.

◆ saveSldStyle()

QString QgsMapLayer::saveSldStyle ( const QString &  uri,
bool &  resultFlag 
) const
virtual

Saves the properties of this layer to an SLD format file.

Parameters
uriuri of destination for exported SLD file.
resultFlaga reference to a flag that will be set to false if the SLD file could not be generated
Returns
a string with any status or error messages
See also
loadSldStyle()
saveSldStyleV2()

Definition at line 2252 of file qgsmaplayer.cpp.

◆ saveSldStyleV2()

QString QgsMapLayer::saveSldStyleV2 ( bool &  resultFlag,
const QgsSldExportContext exportContext 
) const
virtual

Saves the properties of this layer to an SLD format file.

Parameters
resultFlaga reference to a flag that will be set to false if the SLD file could not be generated
exportContextSLD export context
Returns
a string with any status or error messages
See also
loadSldStyle()
Since
QGIS 3.30

Definition at line 2259 of file qgsmaplayer.cpp.

◆ saveStyleToDatabase()

void QgsMapLayer::saveStyleToDatabase ( const QString &  name,
const QString &  description,
bool  useAsDefault,
const QString &  uiFileContent,
QString &  msgError,
QgsMapLayer::StyleCategories  categories = QgsMapLayer::AllStyleCategories 
)
virtual

Saves named and sld style of the layer to the style table in the db.

Parameters
nameStyle name
descriptionA description of the style
useAsDefaultSet to true if style should be used as the default style for the layer
uiFileContent
msgErrorwill be set to a descriptive error message if any occurs
categoriesthe style categories to be saved.
Note
Prior to QGIS 3.24, this method would show a message box warning when a style with the same styleName already existed to confirm replacing the style with the user. Since 3.24, calling this method will ALWAYS overwrite any existing style with the same name. Use QgsProviderRegistry::styleExists() to test in advance if a style already exists and handle this appropriately in your client code.

Definition at line 2681 of file qgsmaplayer.cpp.

◆ selectionProperties()

virtual QgsMapLayerSelectionProperties * QgsMapLayer::selectionProperties ( )
inlinevirtual

Returns the layer's selection properties.

This may be nullptr, depending on the layer type.

Since
QGIS 3.34

Reimplemented in QgsVectorLayer.

Definition at line 1722 of file qgsmaplayer.h.

◆ serverProperties() [1/2]

QgsMapLayerServerProperties * QgsMapLayer::serverProperties ( )
inline

Returns QGIS Server Properties for the map layer.

Since
QGIS 3.22

Definition at line 428 of file qgsmaplayer.h.

◆ serverProperties() [2/2]

const QgsMapLayerServerProperties * QgsMapLayer::serverProperties ( ) const
inline

Returns QGIS Server Properties const for the map layer.

Since
QGIS 3.22

Definition at line 434 of file qgsmaplayer.h.

◆ setAbstract()

void QgsMapLayer::setAbstract ( const QString &  abstract)

Sets the abstract of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setAbstract() instead.

Definition at line 285 of file qgsmaplayer.cpp.

◆ setAttribution()

void QgsMapLayer::setAttribution ( const QString &  attrib)

Sets the attribution of the layerused by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setAttribution() instead.

Definition at line 341 of file qgsmaplayer.cpp.

◆ setAttributionUrl()

void QgsMapLayer::setAttributionUrl ( const QString &  attribUrl)

Sets the attribution URL of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setAttributionUrl() instead.

Definition at line 355 of file qgsmaplayer.cpp.

◆ setAutoRefreshEnabled()

void QgsMapLayer::setAutoRefreshEnabled ( bool  enabled)

Sets whether auto refresh is enabled for the layer.

See also
hasAutoRefreshEnabled()
setAutoRefreshInterval()
Deprecated:
Use setAutoRefreshMode() instead.

Definition at line 1200 of file qgsmaplayer.cpp.

◆ setAutoRefreshInterval()

void QgsMapLayer::setAutoRefreshInterval ( int  interval)

Sets the auto refresh interval (in milliseconds) for the layer.

This will cause the layer to be automatically redrawn on a matching interval. Note that auto refresh must be enabled by calling setAutoRefreshMode().

Note that auto refresh triggers deferred repaints of the layer. Any map canvas must be refreshed separately in order to view the refreshed layer.

See also
autoRefreshInterval()
setAutoRefreshEnabled()

Definition at line 1183 of file qgsmaplayer.cpp.

◆ setAutoRefreshMode()

void QgsMapLayer::setAutoRefreshMode ( Qgis::AutoRefreshMode  mode)

Sets the automatic refresh mode for the layer.

See also
autoRefreshMode()
setAutoRefreshInterval()
Since
QGIS 3.34

Definition at line 1207 of file qgsmaplayer.cpp.

◆ setBlendMode()

void QgsMapLayer::setBlendMode ( QPainter::CompositionMode  blendMode)

Set the blending mode used for rendering a layer.

Parameters
blendModenew blending mode
See also
blendMode()

Definition at line 500 of file qgsmaplayer.cpp.

◆ setCrs()

void QgsMapLayer::setCrs ( const QgsCoordinateReferenceSystem srs,
bool  emitSignal = true 
)

Sets layer's spatial reference system.

If emitSignal is true, changing the CRS will trigger a crsChanged() signal. Additionally, if crs is a compound CRS, then the verticalCrsChanged() signal will also be emitted.

See also
crs()
crsChanged()
setVerticalCrs()

Definition at line 1346 of file qgsmaplayer.cpp.

◆ setCustomEnumProperty()

template<class T >
void QgsMapLayer::setCustomEnumProperty ( const QString &  key,
const T &  value 
)
inline

Set the value of a property based on an enum.

The property will be saved as string.

Note
The enum needs to be declared with Q_ENUM, and flags with Q_FLAG (not Q_FLAGS).
See also
customEnumProperty
setCustomFlagProperty
Since
QGIS 3.22

Definition at line 856 of file qgsmaplayer.h.

◆ setCustomFlagProperty()

template<class T >
void QgsMapLayer::setCustomFlagProperty ( const QString &  key,
const T &  value 
)
inline

Set the value of a property based on a flag.

The property will be saved as string.

Note
The flag needs to be declared with Q_FLAG (not Q_FLAGS).
See also
customFlagProperty
customEnumProperty
Since
QGIS 3.22

Definition at line 946 of file qgsmaplayer.h.

◆ setCustomProperties()

void QgsMapLayer::setCustomProperties ( const QgsObjectCustomProperties properties)

Set custom properties for layer.

Current properties are dropped.

Definition at line 2623 of file qgsmaplayer.cpp.

◆ setCustomProperty()

void QgsMapLayer::setCustomProperty ( const QString &  key,
const QVariant &  value 
)

Set a custom property for layer.

Properties are stored in a map and saved in project file.

See also
customProperty()
removeCustomProperty()

Definition at line 2612 of file qgsmaplayer.cpp.

◆ setDataSource() [1/3]

void QgsMapLayer::setDataSource ( const QString &  dataSource,
const QString &  baseName,
const QString &  provider,
bool  loadDefaultStyleFlag = false 
)

Updates the data source of the layer.

The dataSource argument must specify the new data source string for the layer. The format varies depending on the specified data provider in use. See QgsDataSourceUri and the documentation for the various QgsMapLayer subclasses for further details on data source strings.

The baseName argument specifies the user-visible name to use for the layer. (See name() or setName()).

The provider argument is used to specify the unique key of the data provider to use for the layer. This must match one of the values returned by QgsProviderRegistry::instance()->providerList(). (See providerType()).

If loadDefaultStyleFlag is set to true then the layer's existing style will be reset to the default for the data source.

Note
If loadDefaultStyleFlag is false then the layer's renderer and legend will be preserved only if the geometry type of the new data source matches the current geometry type of the layer.

After setting a new data source callers can test isValid() to determine whether the new source and provider are valid and ready for use. If setting the new data source fails and the layer returns false to isValid(), then descriptive errors relating to setting the data source can be retrieved by calling error().

This method was defined in QgsVectorLayer since 2.10 and was marked as deprecated since 3.2

See also
dataSourceChanged()
Since
QGIS 3.20

Definition at line 2422 of file qgsmaplayer.cpp.

◆ setDataSource() [2/3]

void QgsMapLayer::setDataSource ( const QString &  dataSource,
const QString &  baseName,
const QString &  provider,
const QgsDataProvider::ProviderOptions options,
bool  loadDefaultStyleFlag = false 
)

Updates the data source of the layer.

The dataSource argument must specify the new data source string for the layer. The format varies depending on the specified data provider in use. See QgsDataSourceUri and the documentation for the various QgsMapLayer subclasses for further details on data source strings.

The baseName argument specifies the user-visible name to use for the layer. (See name() or setName()).

The provider argument is used to specify the unique key of the data provider to use for the layer. This must match one of the values returned by QgsProviderRegistry::instance()->providerList(). (See providerType()).

The options argument can be used to pass additional layer properties to the new data provider.

If loadDefaultStyleFlag is set to true then the layer's existing style will be reset to the default for the data source.

Note
If loadDefaultStyleFlag is false then the layer's renderer and legend will be preserved only if the geometry type of the new data source matches the current geometry type of the layer.

After setting a new data source callers can test isValid() to determine whether the new source and provider are valid and ready for use. If setting the new data source fails and the layer returns false to isValid(), then descriptive errors relating to setting the data source can be retrieved by calling error().

See also
dataSourceChanged()
Since
QGIS 3.6

Definition at line 2442 of file qgsmaplayer.cpp.

◆ setDataSource() [3/3]

void QgsMapLayer::setDataSource ( const QString &  dataSource,
const QString &  baseName,
const QString &  provider,
const QgsDataProvider::ProviderOptions options,
QgsDataProvider::ReadFlags  flags 
)

Updates the data source of the layer.

The dataSource argument must specify the new data source string for the layer. The format varies depending on the specified data provider in use. See QgsDataSourceUri and the documentation for the various QgsMapLayer subclasses for further details on data source strings.

The baseName argument specifies the user-visible name to use for the layer. (See name() or setName()).

The provider argument is used to specify the unique key of the data provider to use for the layer. This must match one of the values returned by QgsProviderRegistry::instance()->providerList(). (See providerType()).

The options argument can be used to pass additional layer properties to the new data provider.

The flags argument specifies provider read flags which control the data provider construction, such as QgsDataProvider::ReadFlag::FlagTrustDataSource, QgsDataProvider::ReadFlag::FlagLoadDefaultStyle, etc.

Note
The layer's renderer and legend will be preserved only if the geometry type of the new data source matches the current geometry type of the layer.

After setting a new data source callers can test isValid() to determine whether the new source and provider are valid and ready for use. If setting the new data source fails and the layer returns false to isValid(), then descriptive errors relating to setting the data source can be retrieved by calling error().

See also
dataSourceChanged()
Since
QGIS 3.20

Definition at line 2460 of file qgsmaplayer.cpp.

◆ setDataUrl()

void QgsMapLayer::setDataUrl ( const QString &  dataUrl)

Sets the DataUrl of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setDataUrl() instead.

Definition at line 313 of file qgsmaplayer.cpp.

◆ setDataUrlFormat()

void QgsMapLayer::setDataUrlFormat ( const QString &  dataUrlFormat)

Sets the DataUrl format of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setDataUrlFormat() instead.

Definition at line 327 of file qgsmaplayer.cpp.

◆ setDependencies

bool QgsMapLayer::setDependencies ( const QSet< QgsMapLayerDependency > &  layers)
virtualslot

Sets the list of dependencies.

See also
dependencies()
Parameters
layersset of QgsMapLayerDependency. Only user-defined dependencies will be added
Returns
false if a dependency cycle has been detected

Reimplemented in QgsVectorLayer.

Definition at line 3000 of file qgsmaplayer.cpp.

◆ setError()

void QgsMapLayer::setError ( const QgsError error)
inlineprotected

Sets error message.

Definition at line 2254 of file qgsmaplayer.h.

◆ setExtent()

void QgsMapLayer::setExtent ( const QgsRectangle rect)
protectedvirtual

Sets the extent.

Reimplemented in QgsPluginLayer, and QgsVectorLayer.

Definition at line 2922 of file qgsmaplayer.cpp.

◆ setExtent3D()

void QgsMapLayer::setExtent3D ( const QgsBox3D box)
protectedvirtual

Sets the extent.

Since
QGIS 3.36

Reimplemented in QgsVectorLayer.

Definition at line 2927 of file qgsmaplayer.cpp.

◆ setFlags()

void QgsMapLayer::setFlags ( QgsMapLayer::LayerFlags  flags)

Returns the flags for this layer.

Note
Flags are options specified by the user used for the UI but are not preventing any API call. For instance, even if the Removable flag is not set, the layer can still be removed with the API but the action will not be listed in the legend menu.
See also
properties()
Since
QGIS 3.4

Definition at line 179 of file qgsmaplayer.cpp.

◆ setId()

bool QgsMapLayer::setId ( const QString &  id)

Sets the layer's id.

Returns true if the layer ID was successfully changed, or false if it could not be changed (e.g. because the layer is owned by a QgsProject or QgsMapLayerStore).

Warning
It is the caller's responsibility to ensure that the layer ID is unique in the desired context. Generally this method should not be called, and the auto generated ID should be used instead.
This method should not be called on layers which already belong to a QgsProject or QgsMapLayerStore.
See also
id()
idChanged()
Since
QGIS 3.38

Definition at line 205 of file qgsmaplayer.cpp.

◆ setKeywordList()

void QgsMapLayer::setKeywordList ( const QString &  keywords)

Sets the keyword list of the layerused by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setKeywordList() instead.

Definition at line 299 of file qgsmaplayer.cpp.

◆ setLayerOrder()

void QgsMapLayer::setLayerOrder ( const QStringList &  layers)
virtual

Reorders the previously selected sublayers of this layer from bottom to top.

(Useful for providers that manage their own layers, such as WMS).

Reimplemented in QgsRasterLayer.

Definition at line 1280 of file qgsmaplayer.cpp.

◆ setLegend()

void QgsMapLayer::setLegend ( QgsMapLayerLegend legend)

Assign a legend controller to the map layer.

The object will be responsible for providing legend items.

Parameters
legendTakes ownership of the object. Can be nullptr.

Definition at line 2819 of file qgsmaplayer.cpp.

◆ setLegendPlaceholderImage()

void QgsMapLayer::setLegendPlaceholderImage ( const QString &  imgPath)
inline

Set placeholder image for legend.

If the string is empty, a generated legend will be shown.

Parameters
imgPathfile path to the placeholder image
Since
QGIS 3.22

Definition at line 1750 of file qgsmaplayer.h.

◆ setLegendUrl()

void QgsMapLayer::setLegendUrl ( const QString &  legendUrl)
inline

Sets the URL for the layer's legend.

Definition at line 1500 of file qgsmaplayer.h.

◆ setLegendUrlFormat()

void QgsMapLayer::setLegendUrlFormat ( const QString &  legendUrlFormat)
inline

Sets the format for a URL based layer legend.

Definition at line 1510 of file qgsmaplayer.h.

◆ setMapTipsEnabled()

void QgsMapLayer::setMapTipsEnabled ( bool  enabled)

Enable or disable map tips for this layer.

Parameters
enabledWhether map tips are enabled for this layer
Since
QGIS 3.32

Definition at line 1078 of file qgsmaplayer.cpp.

◆ setMapTipTemplate()

void QgsMapLayer::setMapTipTemplate ( const QString &  mapTipTemplate)

The mapTip is a pretty, html representation for feature information.

It may also contain embedded expressions.

Since
QGIS 3.30

Definition at line 1067 of file qgsmaplayer.cpp.

◆ setMaximumScale

void QgsMapLayer::setMaximumScale ( double  scale)
slot

Sets the maximum map scale (i.e.

most "zoomed in" scale) at which the layer will be visible. The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale of 0 indicates no maximum scale visibility.

Note
Scale based visibility is only used if setScaleBasedVisibility() is set to true.
See also
maximumScale()
setMinimumScale()
setScaleBasedVisibility()

Definition at line 1238 of file qgsmaplayer.cpp.

◆ setMetadata()

void QgsMapLayer::setMetadata ( const QgsLayerMetadata metadata)
virtual

Sets the layer's metadata store.

See also
metadata()
metadataChanged()

Definition at line 2891 of file qgsmaplayer.cpp.

◆ setMetadataUrl()

void QgsMapLayer::setMetadataUrl ( const QString &  metaUrl)

Sets the metadata URL of the layer used by QGIS Server in GetCapabilities request.

MetadataUrl is a a link to the detailed, standardized metadata about the data. Since QGIS 3.22, it edits the first metadata URL link.

See also
serverProperties()
Deprecated:
since QGIS 3.22

Definition at line 370 of file qgsmaplayer.cpp.

◆ setMetadataUrlFormat()

void QgsMapLayer::setMetadataUrlFormat ( const QString &  metaUrlFormat)

Sets the metadata format of the layer used by QGIS Server in GetCapabilities request.

MetadataUrlType indicates how the metadata is structured. Since QGIS 3.22, it edits the first metadata URL format.

See also
serverProperties()
Deprecated:
since QGIS 3.22

Definition at line 436 of file qgsmaplayer.cpp.

◆ setMetadataUrlType()

void QgsMapLayer::setMetadataUrlType ( const QString &  metaUrlType)

Set the metadata type of the layer used by QGIS Server in GetCapabilities request MetadataUrlType indicates the standard to which the metadata complies.

Since QGIS 3.22, it edits the first metadata URL type.

See also
serverProperties()
Deprecated:
since QGIS 3.22

Definition at line 403 of file qgsmaplayer.cpp.

◆ setMinimumScale

void QgsMapLayer::setMinimumScale ( double  scale)
slot

Sets the minimum map scale (i.e.

most "zoomed out" scale) at which the layer will be visible. The scale value indicates the scale denominator, e.g. 1000.0 for a 1:1000 map. A scale of 0 indicates no minimum scale visibility.

Note
Scale based visibility is only used if setScaleBasedVisibility() is set to true.
See also
minimumScale()
setMaximumScale()
setScaleBasedVisibility()

Definition at line 1252 of file qgsmaplayer.cpp.

◆ setName()

void QgsMapLayer::setName ( const QString &  name)

Set the display name of the layer.

See also
name()

Definition at line 222 of file qgsmaplayer.cpp.

◆ setOpacity()

void QgsMapLayer::setOpacity ( double  opacity)
virtual

Sets the opacity for the layer, where opacity is a value between 0 (totally transparent) and 1.0 (fully opaque).

See also
opacity()
opacityChanged()
Note
Prior to QGIS 3.18, this method was available for vector layers only
Since
QGIS 3.18

Reimplemented in QgsRasterLayer.

Definition at line 520 of file qgsmaplayer.cpp.

◆ setOriginalXmlProperties()

void QgsMapLayer::setOriginalXmlProperties ( const QString &  originalXmlProperties)

Sets the original XML properties for the layer to originalXmlProperties.

The storage format for the XML is qlr

Since
QGIS 3.6

Definition at line 2948 of file qgsmaplayer.cpp.

◆ setProviderType()

void QgsMapLayer::setProviderType ( const QString &  providerType)
protected

Sets the providerType (provider key)

Definition at line 2986 of file qgsmaplayer.cpp.

◆ setRefreshOnNofifyMessage

void QgsMapLayer::setRefreshOnNofifyMessage ( const QString &  message)
inlineslot

Set the notification message that triggers repaint If refresh on notification is enabled, the notification will triggerRepaint only if the notification message is equal to.

Parameters
message

Definition at line 1878 of file qgsmaplayer.h.

◆ setRefreshOnNotifyEnabled

void QgsMapLayer::setRefreshOnNotifyEnabled ( bool  enabled)
slot

Set whether provider notification is connected to triggerRepaint.

Definition at line 3017 of file qgsmaplayer.cpp.

◆ setRenderer3D()

void QgsMapLayer::setRenderer3D ( QgsAbstract3DRenderer renderer)

Sets 3D renderer for the layer.

Takes ownership of the renderer.

Definition at line 2852 of file qgsmaplayer.cpp.

◆ setScaleBasedVisibility

void QgsMapLayer::setScaleBasedVisibility ( bool  enabled)
slot

Sets whether scale based visibility is enabled for the layer.

Parameters
enabledset to true to enable scale based visibility
See also
setMinimumScale
setMaximumScale
hasScaleBasedVisibility

Definition at line 1259 of file qgsmaplayer.cpp.

◆ setShortName()

void QgsMapLayer::setShortName ( const QString &  shortName)

Sets the short name of the layer used by QGIS Server to identify the layer.

Deprecated:
since QGIS 3.38 use serverProperties()->setShortName() instead.

Definition at line 257 of file qgsmaplayer.cpp.

◆ setSubLayerVisibility()

void QgsMapLayer::setSubLayerVisibility ( const QString &  name,
bool  visible 
)
virtual

Set the visibility of the given sublayer name.

Parameters
namesublayer name
visiblesublayer visibility

Reimplemented in QgsRasterLayer.

Definition at line 1287 of file qgsmaplayer.cpp.

◆ setTitle()

void QgsMapLayer::setTitle ( const QString &  title)

Sets the title of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->setTitle() instead.

Definition at line 271 of file qgsmaplayer.cpp.

◆ setTransformContext

virtual void QgsMapLayer::setTransformContext ( const QgsCoordinateTransformContext transformContext)
pure virtualslot

Sets the coordinate transform context to transformContext.

Since
QGIS 3.8

Implemented in QgsAnnotationLayer, QgsGroupLayer, QgsPointCloudLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

◆ setValid()

void QgsMapLayer::setValid ( bool  valid)
protected

Sets whether layer is valid or not.

Definition at line 2808 of file qgsmaplayer.cpp.

◆ setVerticalCrs()

bool QgsMapLayer::setVerticalCrs ( const QgsCoordinateReferenceSystem crs,
QString *  errorMessage = nullptr 
)

Sets the layer's vertical coordinate reference system.

The verticalCrsChanged() signal will be raised if the vertical CRS is changed.

Note
If the layer crs() is a compound CRS, then the CRS returned for verticalCrs() will be the vertical component of crs(). Otherwise it will be the value explicitly set by this call.
Parameters
crsthe vertical CRS
errorMessagewill be set to a descriptive message if the vertical CRS could not be set
Returns
true if vertical CRS was successfully set
See also
verticalCrs()
setCrs()
Since
QGIS 3.38

Definition at line 1375 of file qgsmaplayer.cpp.

◆ shortName()

QString QgsMapLayer::shortName ( ) const

Returns the short name of the layer used by QGIS Server to identify the layer.

Deprecated:
since QGIS 3.38 use serverProperties()->shortName() instead.

Definition at line 264 of file qgsmaplayer.cpp.

◆ source()

QString QgsMapLayer::source ( ) const

Returns the source for the layer.

This source may contain usernames, passwords and other sensitive information.

See also
publicSource()

Definition at line 479 of file qgsmaplayer.cpp.

◆ statusChanged

void QgsMapLayer::statusChanged ( const QString &  status)
signal

Emit a signal with status (e.g. to be caught by QgisApp and display a msg on status bar)

◆ styleChanged

void QgsMapLayer::styleChanged ( )
signal

Signal emitted whenever a change affects the layer's style.

Ie this may be triggered by renderer changes, label style changes, or other style changes such as blend mode or layer opacity changes.

Warning
This signal should never be manually emitted. Instead call the emitStyleChanged() method to ensure that the signal is only emitted when appropriate.
See also
rendererChanged()

◆ styleLoaded

void QgsMapLayer::styleLoaded ( QgsMapLayer::StyleCategories  categories)
signal

Emitted when a style has been loaded.

Parameters
categoriesstyle categories
Since
QGIS 3.12

◆ styleManager()

QgsMapLayerStyleManager * QgsMapLayer::styleManager ( ) const

Gets access to the layer's style manager.

Style manager allows switching between multiple styles.

Definition at line 2845 of file qgsmaplayer.cpp.

◆ styleURI()

QString QgsMapLayer::styleURI ( ) const
virtual

Retrieve the style URI for this layer (either as a .qml file on disk or as a record in the users style table in their personal qgis.db)

Returns
a QString with the style file name
See also
loadNamedStyle()
saveNamedStyle()

Definition at line 1577 of file qgsmaplayer.cpp.

◆ subLayers()

QStringList QgsMapLayer::subLayers ( ) const
virtual

Returns the sublayers of this layer.

(Useful for providers that manage their own layers, such as WMS).

Reimplemented in QgsMeshLayer, and QgsRasterLayer.

Definition at line 1273 of file qgsmaplayer.cpp.

◆ supportsEditing()

bool QgsMapLayer::supportsEditing ( ) const
virtual

Returns whether the layer supports editing or not.

Returns
false if the layer is read only or the data provider has no editing capabilities.
Note
default implementation returns false.
Since
QGIS 3.22 in the base class QgsMapLayer.

Reimplemented in QgsAnnotationLayer, QgsMeshLayer, and QgsVectorLayer.

Definition at line 1295 of file qgsmaplayer.cpp.

◆ temporalProperties()

virtual QgsMapLayerTemporalProperties * QgsMapLayer::temporalProperties ( )
inlinevirtual

Returns the layer's temporal properties.

This may be nullptr, depending on the layer type.

Since
QGIS 3.14

Reimplemented in QgsMeshLayer, QgsRasterLayer, and QgsVectorLayer.

Definition at line 1729 of file qgsmaplayer.h.

◆ timestamp()

QDateTime QgsMapLayer::timestamp ( ) const
virtual

Time stamp of data source in the moment when data/metadata were loaded by provider.

Reimplemented in QgsRasterLayer.

Definition at line 2907 of file qgsmaplayer.cpp.

◆ title()

QString QgsMapLayer::title ( ) const

Returns the title of the layer used by QGIS Server in GetCapabilities request.

Deprecated:
since QGIS 3.38 use serverProperties()->title() instead.

Definition at line 278 of file qgsmaplayer.cpp.

◆ transformContext()

QgsCoordinateTransformContext QgsMapLayer::transformContext ( ) const

Returns the layer data provider coordinate transform context or a default transform context if the layer does not have a valid data provider.

Since
QGIS 3.8

Definition at line 1473 of file qgsmaplayer.cpp.

◆ trigger3DUpdate

void QgsMapLayer::trigger3DUpdate ( )
slot

Will advise any 3D maps that this layer requires to be updated in the scene.

Will emit a request3DUpdate() signal.

Since
QGIS 3.18

Definition at line 2884 of file qgsmaplayer.cpp.

◆ triggerRepaint

void QgsMapLayer::triggerRepaint ( bool  deferredUpdate = false)
slot

Will advise the map canvas (and any other interested party) that this layer requires to be repainted.

Will emit a repaintRequested() signal. If deferredUpdate is true then the layer will only be repainted when the canvas is next re-rendered, and will not trigger any canvas redraws itself.

Note
in 2.6 function moved from vector/raster subclasses to QgsMapLayer

Definition at line 2873 of file qgsmaplayer.cpp.

◆ type()

Qgis::LayerType QgsMapLayer::type ( ) const

Returns the type of the layer.

Definition at line 164 of file qgsmaplayer.cpp.

◆ undoStack()

QUndoStack * QgsMapLayer::undoStack ( )

Returns pointer to layer's undo stack.

Definition at line 2591 of file qgsmaplayer.cpp.

◆ undoStackStyles()

QUndoStack * QgsMapLayer::undoStackStyles ( )

Returns pointer to layer's style undo stack.

Definition at line 2598 of file qgsmaplayer.cpp.

◆ verticalCrs()

QgsCoordinateReferenceSystem QgsMapLayer::verticalCrs ( ) const

Returns the layer's vertical coordinate reference system.

If the layer crs() is a compound CRS, then the CRS returned will be the vertical component of crs(). Otherwise it will be the value explicitly set by a call to setVerticalCrs().

The returned CRS will be invalid if the layer has no vertical CRS.

Note
Consider also using crs3D(), which will return a CRS which takes into account both crs() and verticalCrs().
See also
crs()
crs3D()
setVerticalCrs()
Since
QGIS 3.38

Definition at line 1310 of file qgsmaplayer.cpp.

◆ verticalCrsChanged

void QgsMapLayer::verticalCrsChanged ( )
signal

Emitted when the verticalCrs() of the layer has changed.

This signal will be emitted whenever the vertical CRS of the layer is changed, either as a direct result of a call to setVerticalCrs() or when setCrs() is called with a compound CRS.

See also
crsChanged()
crs3DChanged()
setCrs()
setVerticalCrs()
verticalCrs()
Since
QGIS 3.38

◆ wgs84Extent()

QgsRectangle QgsMapLayer::wgs84Extent ( bool  forceRecalculate = false) const

Returns the WGS84 extent (EPSG:4326) of the layer according to ReadFlag::FlagTrustLayerMetadata.

If that flag is activated, then the WGS84 extent read in the qgs project is returned. Otherwise, the actual WGS84 extent is returned.

Parameters
forceRecalculateTrue to return the current WGS84 extent whatever the read flags
Since
QGIS 3.20

Definition at line 3061 of file qgsmaplayer.cpp.

◆ willBeDeleted

void QgsMapLayer::willBeDeleted ( )
signal

Emitted in the destructor when the layer is about to be deleted, but it is still in a perfectly valid state: the last chance for other pieces of code for some cleanup if they use the layer.

◆ writeCommonStyle()

void QgsMapLayer::writeCommonStyle ( QDomElement &  layerElement,
QDomDocument &  document,
const QgsReadWriteContext context,
QgsMapLayer::StyleCategories  categories = AllStyleCategories 
) const
protected

Write style data common to all layer types.

Definition at line 902 of file qgsmaplayer.cpp.

◆ writeCustomProperties()

void QgsMapLayer::writeCustomProperties ( QDomNode &  layerNode,
QDomDocument &  doc 
) const
protected

Write custom properties to project file.

Definition at line 1030 of file qgsmaplayer.cpp.

◆ writeLayerXml()

bool QgsMapLayer::writeLayerXml ( QDomElement &  layerElement,
QDomDocument &  document,
const QgsReadWriteContext context 
) const

Stores state in DOM node.

Parameters
layerElementis a DOM element corresponding to `‘maplayer’' tag
documentis a the DOM document being written
contextreading context (e.g. for conversion between relative and absolute paths)
Note

The DOM node corresponds to a DOM document project file XML element to be written by QgsProject.

This, in turn, calls writeXml() (and then writeSymbology), which is over-rideable by sub-classes so that they can write their own specific state to the given DOM node.

Invoked by QgsProject::write().

Returns
true if successful

Definition at line 738 of file qgsmaplayer.cpp.

◆ writeStyle()

bool QgsMapLayer::writeStyle ( QDomNode &  node,
QDomDocument &  doc,
QString &  errorMessage,
const QgsReadWriteContext context,
QgsMapLayer::StyleCategories  categories = AllStyleCategories 
) const
virtual

Write just the symbology information for the layer into the document.

Parameters
nodethe node that will have the style element added to it.
docthe document that will have the QDomNode added.
errorMessagereference to string that will be updated with any error messages
contextwriting context (used for transform from absolute to relative paths)
categoriesthe style categories to be written
Returns
true in case of success.
Note
To be implemented in subclasses. Default implementation does nothing and returns false.
There is a confusion of terms with the GUI. This method actually writes what is known as the symbology in the application.

Reimplemented in QgsVectorLayer, QgsRasterLayer, QgsAnnotationLayer, QgsPointCloudLayer, QgsTiledSceneLayer, and QgsMeshLayer.

Definition at line 2408 of file qgsmaplayer.cpp.

◆ writeStyleManager()

void QgsMapLayer::writeStyleManager ( QDomNode &  layerNode,
QDomDocument &  doc 
) const
protected

Write style manager's configuration (if exists). To be called by subclasses.

Definition at line 1048 of file qgsmaplayer.cpp.

◆ writeSymbology()

virtual bool QgsMapLayer::writeSymbology ( QDomNode &  node,
QDomDocument &  doc,
QString &  errorMessage,
const QgsReadWriteContext context,
StyleCategories  categories = AllStyleCategories 
) const
pure virtual

Write the style for the layer into the document provided.

Parameters
nodethe node that will have the style element added to it.
docthe document that will have the QDomNode added.
errorMessagereference to string that will be updated with any error messages
contextwriting context (used for transform from absolute to relative paths)
categoriesthe style categories to be written
Note
There is a confusion of terms with the GUI. This method actually writes what is called a style in the application.
Returns
true in case of success.

Implemented in QgsRasterLayer, QgsAnnotationLayer, QgsGroupLayer, QgsVectorLayer, QgsMeshLayer, QgsPointCloudLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

◆ writeXml()

bool QgsMapLayer::writeXml ( QDomNode &  layer_node,
QDomDocument &  document,
const QgsReadWriteContext context 
) const
protectedvirtual

Called by writeLayerXML(), used by children to write state specific to them to project files.

Reimplemented in QgsVectorLayer, QgsAnnotationLayer, QgsMeshLayer, QgsGroupLayer, QgsRasterLayer, QgsPointCloudLayer, QgsTiledSceneLayer, and QgsVectorTileLayer.

Definition at line 974 of file qgsmaplayer.cpp.

Friends And Related Symbol Documentation

◆ QgsVectorLayer

friend class QgsVectorLayer
friend

Definition at line 2469 of file qgsmaplayer.h.

◆ TestQgsMapLayer

friend class TestQgsMapLayer
friend

Definition at line 2471 of file qgsmaplayer.h.

◆ TestQgsProject

friend class TestQgsProject
friend

Definition at line 2470 of file qgsmaplayer.h.

Member Data Documentation

◆ mBlockStyleChangedSignal

int QgsMapLayer::mBlockStyleChangedSignal = 0
protected

If non-zero, the styleChanged signal should not be emitted.

Since
QGIS 3.20

Definition at line 2320 of file qgsmaplayer.h.

◆ mDataSource

QString QgsMapLayer::mDataSource
protected

Data source description string, varies by layer type.

Definition at line 2268 of file qgsmaplayer.h.

◆ mDependencies

QSet<QgsMapLayerDependency> QgsMapLayer::mDependencies
protected

List of layers that may modify this layer on modification.

Definition at line 2281 of file qgsmaplayer.h.

◆ mError

QgsError QgsMapLayer::mError
protected

Error.

Definition at line 2278 of file qgsmaplayer.h.

◆ mIsRefreshOnNofifyEnabled

bool QgsMapLayer::mIsRefreshOnNofifyEnabled = false
protected

Definition at line 2290 of file qgsmaplayer.h.

◆ mLayerName

QString QgsMapLayer::mLayerName
protected

Name of the layer - used for display.

Definition at line 2271 of file qgsmaplayer.h.

◆ mLayerOpacity

double QgsMapLayer::mLayerOpacity = 1.0
protected

Layer opacity.

Since
QGIS 3.18

Definition at line 2313 of file qgsmaplayer.h.

◆ mLegendUrl

QString QgsMapLayer::mLegendUrl
protected

WMS legend.

Definition at line 2274 of file qgsmaplayer.h.

◆ mLegendUrlFormat

QString QgsMapLayer::mLegendUrlFormat
protected

Definition at line 2275 of file qgsmaplayer.h.

◆ mPreloadedProvider

std::unique_ptr<QgsDataProvider> QgsMapLayer::mPreloadedProvider
protected

Optionally used when loading a project, it is released when the layer is effectively created.

Note
Not available in Python bindings.
Since
QGIS 3.32

Definition at line 2357 of file qgsmaplayer.h.

◆ mProviderKey

QString QgsMapLayer::mProviderKey
protected

Data provider key (name of the data provider)

Definition at line 2294 of file qgsmaplayer.h.

◆ mReadFlags

QgsMapLayer::ReadFlags QgsMapLayer::mReadFlags = QgsMapLayer::ReadFlags()
protected

Read flags. It's up to the subclass to respect these when restoring state from XML.

Definition at line 2299 of file qgsmaplayer.h.

◆ mRefreshOnNofifyMessage

QString QgsMapLayer::mRefreshOnNofifyMessage
protected

Definition at line 2291 of file qgsmaplayer.h.

◆ mShouldValidateCrs

bool QgsMapLayer::mShouldValidateCrs = true
protected

true if the layer's CRS should be validated and invalid CRSes are not permitted.

Since
QGIS 3.10

Definition at line 2306 of file qgsmaplayer.h.

◆ mValid

bool QgsMapLayer::mValid = false
protected

Indicates if the layer is valid and can be drawn.

Definition at line 2265 of file qgsmaplayer.h.

Property Documentation

◆ autoRefreshInterval

int QgsMapLayer::autoRefreshInterval
readwrite

Definition at line 80 of file qgsmaplayer.h.

◆ crs

QgsCoordinateReferenceSystem QgsMapLayer::crs
readwrite

Definition at line 82 of file qgsmaplayer.h.

◆ crs3D

QgsCoordinateReferenceSystem QgsMapLayer::crs3D
read

Definition at line 84 of file qgsmaplayer.h.

◆ id

QString QgsMapLayer::id
readwrite

Definition at line 78 of file qgsmaplayer.h.

◆ isValid

bool QgsMapLayer::isValid
read

Definition at line 86 of file qgsmaplayer.h.

◆ mapTipsEnabled

bool QgsMapLayer::mapTipsEnabled
readwrite

Definition at line 89 of file qgsmaplayer.h.

◆ mapTipTemplate

QString QgsMapLayer::mapTipTemplate
readwrite

Definition at line 88 of file qgsmaplayer.h.

◆ metadata

QgsLayerMetadata QgsMapLayer::metadata
readwrite

Definition at line 81 of file qgsmaplayer.h.

◆ name

QString QgsMapLayer::name
readwrite

Definition at line 79 of file qgsmaplayer.h.

◆ opacity

double QgsMapLayer::opacity
readwrite

Definition at line 87 of file qgsmaplayer.h.

◆ type

Qgis::LayerType QgsMapLayer::type
read

Definition at line 85 of file qgsmaplayer.h.

◆ verticalCrs

QgsCoordinateReferenceSystem QgsMapLayer::verticalCrs
readwrite

Definition at line 83 of file qgsmaplayer.h.


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