QGIS API Documentation  3.16.0-Hannover (43b64b13f3)
Public Member Functions | List of all members
QgsVectorTileLayer Class Reference

Implements a map layer that is dedicated to rendering of vector tiles. More...

#include <qgsvectortilelayer.h>

Inheritance diagram for QgsVectorTileLayer:
Inheritance graph
[legend]

Public Member Functions

 QgsVectorTileLayer (const QString &path=QString(), const QString &baseName=QString())
 Constructs a new vector tile layer. More...
 
 ~QgsVectorTileLayer () override
 
QgsVectorTileLayerclone () const override
 Returns a new instance equivalent to this one except for the id which is still unique. More...
 
QgsMapLayerRenderercreateMapRenderer (QgsRenderContext &rendererContext) override
 Returns new instance of QgsMapLayerRenderer that will be used for rendering of given context. More...
 
QString decodedSource (const QString &source, const QString &provider, const QgsReadWriteContext &context) const FINAL
 Called by readLayerXML(), used by derived classes to decode provider's specific data source from project files. More...
 
QString encodedSource (const QString &source, const QgsReadWriteContext &context) const FINAL
 Called by writeLayerXML(), used by derived classes to encode provider's specific data source to project files. More...
 
QByteArray getRawTile (QgsTileXYZ tileID)
 Fetches raw tile data for the give tile coordinates. More...
 
QString htmlMetadata () const override
 Obtain a formatted HTML string containing assorted metadata for this layer. More...
 
bool isTileBorderRenderingEnabled () const
 Returns whether to render also borders of tiles (useful for debugging) More...
 
QgsVectorTileLabelinglabeling () const
 Returns currently assigned labeling. More...
 
QString loadDefaultMetadata (bool &resultFlag) override
 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) More...
 
QString loadDefaultStyle (bool &resultFlag) override
 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) More...
 
bool loadDefaultStyle (QString &error, QStringList &warnings)
 Loads the default style for the layer, and returns true if the style was successfully loaded. More...
 
bool readSymbology (const QDomNode &node, QString &errorMessage, QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) override
 Read the symbology for the current layer from the DOM node supplied. More...
 
bool readXml (const QDomNode &layerNode, QgsReadWriteContext &context) override
 Called by readLayerXML(), used by children to read state specific to them from project files. More...
 
QgsVectorTileRendererrenderer () const
 Returns currently assigned renderer. More...
 
void setLabeling (QgsVectorTileLabeling *labeling)
 Sets labeling for the map layer. More...
 
void setRenderer (QgsVectorTileRenderer *r)
 Sets renderer for the map layer. More...
 
void setTileBorderRenderingEnabled (bool enabled)
 Sets whether to render also borders of tiles (useful for debugging) More...
 
void setTransformContext (const QgsCoordinateTransformContext &transformContext) override
 Sets the coordinate transform context to transformContext. More...
 
int sourceMaxZoom () const
 Returns maximum zoom level at which source has any valid tiles (negative = unconstrained) More...
 
int sourceMinZoom () const
 Returns minimum zoom level at which source has any valid tiles (negative = unconstrained) More...
 
QString sourcePath () const
 Returns URL/path of the data source (syntax different to each data source type) More...
 
QString sourceType () const
 Returns type of the data source. More...
 
bool writeSymbology (QDomNode &node, QDomDocument &doc, QString &errorMessage, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const override
 Write the style for the layer into the docment provided. More...
 
bool writeXml (QDomNode &layerNode, QDomDocument &doc, const QgsReadWriteContext &context) const override
 Called by writeLayerXML(), used by children to write state specific to them to project files. More...
 
- Public Member Functions inherited from QgsMapLayer
 QgsMapLayer (QgsMapLayer const &)=delete
 QgsMapLayer cannot be copied. More...
 
 QgsMapLayer (QgsMapLayerType type=QgsMapLayerType::VectorLayer, const QString &name=QString(), const QString &source=QString())
 Constructor for QgsMapLayer. More...
 
 ~QgsMapLayer () override
 
QString abstract () const
 Returns the abstract of the layer used by QGIS Server in GetCapabilities request. More...
 
virtual bool accept (QgsStyleEntityVisitorInterface *visitor) const
 Accepts the specified symbology visitor, causing it to visit all symbols associated with the layer. More...
 
QString attribution () const
 Returns the attribution of the layer used by QGIS Server in GetCapabilities request. More...
 
QString attributionUrl () const
 Returns the attribution URL of the layer used by QGIS Server in GetCapabilities request. More...
 
int autoRefreshInterval () const
 Returns the auto refresh interval (in milliseconds). More...
 
QPainter::CompositionMode blendMode () const
 Returns the current blending mode for a layer. More...
 
QgsCoordinateReferenceSystem crs () const
 Returns the layer's spatial reference system. More...
 
const QgsObjectCustomPropertiescustomProperties () const
 Read all custom properties from layer. More...
 
Q_INVOKABLE QVariant customProperty (const QString &value, const QVariant &defaultValue=QVariant()) const
 Read a custom property from layer. More...
 
Q_INVOKABLE QStringList customPropertyKeys () const
 Returns list of all keys within custom properties. More...
 
virtual QgsDataProviderdataProvider ()
 Returns the layer's data provider, it may be nullptr. More...
 
virtual const QgsDataProviderdataProvider () const
 Returns the layer's data provider in a const-correct manner, it may be nullptr. More...
 
QString dataUrl () const
 Returns the DataUrl of the layer used by QGIS Server in GetCapabilities request. More...
 
QString dataUrlFormat () const
 Returns the DataUrl format of the layer used by QGIS Server in GetCapabilities request. More...
 
virtual QSet< QgsMapLayerDependencydependencies () const
 Gets the list of dependencies. More...
 
virtual QgsError error () const
 Gets current status error. More...
 
void exportNamedMetadata (QDomDocument &doc, QString &errorMsg) const
 Export the current metadata of this layer as named metadata in a QDomDocument. More...
 
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. More...
 
virtual void exportSldStyle (QDomDocument &doc, QString &errorMsg) const
 Export the properties of this layer as SLD style in a QDomDocument. More...
 
virtual QgsRectangle extent () const
 Returns the extent of the layer. More...
 
QgsMapLayer::LayerFlags flags () const
 Returns the flags for this layer. More...
 
bool hasAutoRefreshEnabled () const
 Returns true if auto refresh is enabled for the layer. More...
 
bool hasScaleBasedVisibility () const
 Returns whether scale based visibility is enabled for the layer. More...
 
QString id () const
 Returns the layer's unique ID, which is used to access this layer from QgsProject. More...
 
bool importNamedMetadata (QDomDocument &document, QString &errorMessage)
 Import the metadata of this layer from a QDomDocument. More...
 
virtual bool importNamedStyle (QDomDocument &doc, QString &errorMsg, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
 Import the properties of this layer from a QDomDocument. More...
 
virtual bool isEditable () const
 Returns true if the layer can be edited. More...
 
bool isInScaleRange (double scale) const
 Tests whether the layer should be visible at the specified scale. More...
 
bool isRefreshOnNotifyEnabled () const
 Returns true if the refresh on provider nofification is enabled. More...
 
virtual bool isSpatial () const
 Returns true if the layer is considered a spatial layer, ie it has some form of geometry associated with it. More...
 
virtual bool isTemporary () const
 Returns true if the layer is considered a temporary layer. More...
 
bool isValid () const
 Returns the status of the layer. More...
 
QString keywordList () const
 Returns the keyword list of the layer used by QGIS Server in GetCapabilities request. More...
 
QgsMapLayerLegendlegend () const
 Can be nullptr. More...
 
QString legendUrl () const
 Returns the URL for the layer's legend. More...
 
QString legendUrlFormat () const
 Returns the format for a URL based layer legend. More...
 
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) More...
 
bool loadNamedMetadataFromDatabase (const QString &db, const QString &uri, QString &qmd)
 Retrieve a named metadata for this layer from a sqlite database. More...
 
virtual QString loadNamedStyle (const QString &uri, bool &resultFlag, QgsMapLayer::StyleCategories categories=QgsMapLayer::AllStyleCategories)
 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) More...
 
virtual bool loadNamedStyleFromDatabase (const QString &db, const QString &uri, QString &qml)
 Retrieve a named style for this layer from a sqlite database. More...
 
virtual QString loadSldStyle (const QString &uri, bool &resultFlag)
 Attempts to style the layer using the formatting from an SLD type file. More...
 
double maximumScale () const
 Returns the maximum map scale (i.e. More...
 
virtual const QgsLayerMetadatametadata () const
 Returns a reference to the layer's metadata store. More...
 
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) More...
 
QString metadataUrl () const
 Returns the metadata URL of the layer used by QGIS Server in GetCapabilities request. More...
 
QString metadataUrlFormat () const
 Returns the metadata format of the layer used by QGIS Server in GetCapabilities request. More...
 
QString metadataUrlType () const
 Returns the metadata type of the layer used by QGIS Server in GetCapabilities request. More...
 
double minimumScale () const
 Returns the minimum map scale (i.e. More...
 
QString name () const
 Returns the display name of the layer. More...
 
QgsMapLayeroperator= (QgsMapLayer const &)=delete
 QgsMapLayer cannot be copied. More...
 
QString originalXmlProperties () const
 Returns the XML properties of the original layer as they were when the layer was first read from the project file. More...
 
QString providerType () const
 Returns the provider type (provider key) for this layer. More...
 
QString publicSource () const
 Gets a version of the internal layer definition that has sensitive bits removed (for example, the password). More...
 
bool readLayerXml (const QDomElement &layerElement, QgsReadWriteContext &context, QgsMapLayer::ReadFlags flags=QgsMapLayer::ReadFlags())
 Sets state from DOM document. More...
 
bool readOnly () const
 Returns if this layer is read only. More...
 
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. More...
 
QString refreshOnNotifyMessage () const
 Returns the message that should be notified by the provider to triggerRepaint. More...
 
virtual void reload ()
 Synchronises with changes in the datasource. More...
 
void removeCustomProperty (const QString &key)
 Remove a custom property from layer. More...
 
QgsAbstract3DRendererrenderer3D () const
 Returns 3D renderer associated with the layer. More...
 
virtual void resolveReferences (QgsProject *project)
 Resolve references to other layers (kept as layer IDs after reading XML) into layer objects. More...
 
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) More...
 
virtual 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) More...
 
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) More...
 
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) More...
 
virtual QString saveSldStyle (const QString &uri, bool &resultFlag) const
 Saves the properties of this layer to an SLD format file. More...
 
void setAbstract (const QString &abstract)
 Sets the abstract of the layer used by QGIS Server in GetCapabilities request. More...
 
void setAttribution (const QString &attrib)
 Sets the attribution of the layer used by QGIS Server in GetCapabilities request. More...
 
void setAttributionUrl (const QString &attribUrl)
 Sets the attribution URL of the layer used by QGIS Server in GetCapabilities request. More...
 
void setAutoRefreshEnabled (bool enabled)
 Sets whether auto refresh is enabled for the layer. More...
 
void setAutoRefreshInterval (int interval)
 Sets the auto refresh interval (in milliseconds) for the layer. More...
 
void setBlendMode (QPainter::CompositionMode blendMode)
 Set the blending mode used for rendering a layer. More...
 
void setCrs (const QgsCoordinateReferenceSystem &srs, bool emitSignal=true)
 Sets layer's spatial reference system. More...
 
void setCustomProperties (const QgsObjectCustomProperties &properties)
 Set custom properties for layer. More...
 
Q_INVOKABLE void setCustomProperty (const QString &key, const QVariant &value)
 Set a custom property for layer. More...
 
virtual 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. More...
 
void setDataUrl (const QString &dataUrl)
 Sets the DataUrl of the layer used by QGIS Server in GetCapabilities request. More...
 
void setDataUrlFormat (const QString &dataUrlFormat)
 Sets the DataUrl format of the layer used by QGIS Server in GetCapabilities request. More...
 
void setFlags (QgsMapLayer::LayerFlags flags)
 Returns the flags for this layer. More...
 
void setKeywordList (const QString &keywords)
 Sets the keyword list of the layer used by QGIS Server in GetCapabilities request. More...
 
virtual void setLayerOrder (const QStringList &layers)
 Reorders the previously selected sublayers of this layer from bottom to top. More...
 
void setLegend (QgsMapLayerLegend *legend)
 Assign a legend controller to the map layer. More...
 
void setLegendUrl (const QString &legendUrl)
 Sets the URL for the layer's legend. More...
 
void setLegendUrlFormat (const QString &legendUrlFormat)
 Sets the format for a URL based layer legend. More...
 
virtual void setMetadata (const QgsLayerMetadata &metadata)
 Sets the layer's metadata store. More...
 
void setMetadataUrl (const QString &metaUrl)
 Sets the metadata URL of the layer used by QGIS Server in GetCapabilities request. More...
 
void setMetadataUrlFormat (const QString &metaUrlFormat)
 Sets the metadata format of the layer used by QGIS Server in GetCapabilities request. More...
 
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. More...
 
void setName (const QString &name)
 Set the display name of the layer. More...
 
void setOriginalXmlProperties (const QString &originalXmlProperties)
 Sets the original XML properties for the layer to originalXmlProperties. More...
 
void setRenderer3D (QgsAbstract3DRenderer *renderer)
 Sets 3D renderer for the layer. More...
 
void setShortName (const QString &shortName)
 Sets the short name of the layer used by QGIS Server to identify the layer. More...
 
virtual void setSubLayerVisibility (const QString &name, bool visible)
 Set the visibility of the given sublayer name. More...
 
void setTitle (const QString &title)
 Sets the title of the layer used by QGIS Server in GetCapabilities request. More...
 
QString shortName () const
 Returns the short name of the layer used by QGIS Server to identify the layer. More...
 
QString source () const
 Returns the source for the layer. More...
 
QgsMapLayerStyleManagerstyleManager () const
 Gets access to the layer's style manager. More...
 
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) More...
 
virtual QStringList subLayers () const
 Returns the sublayers of this layer. More...
 
virtual QgsMapLayerTemporalPropertiestemporalProperties ()
 Returns the layer's temporal properties. More...
 
virtual QDateTime timestamp () const
 Time stamp of data source in the moment when data/metadata were loaded by provider. More...
 
QString title () const
 Returns the title of the layer used by QGIS Server in GetCapabilities request. More...
 
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. More...
 
QgsMapLayerType type () const
 Returns the type of the layer. More...
 
QUndoStack * undoStack ()
 Returns pointer to layer's undo stack. More...
 
QUndoStack * undoStackStyles ()
 Returns pointer to layer's style undo stack. More...
 
bool writeLayerXml (QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context) const
 Stores state in DOM node. More...
 
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. More...
 

Additional Inherited Members

- Public Types inherited from QgsMapLayer
enum  LayerFlag { Identifiable = 1 << 0, Removable = 1 << 1, Searchable = 1 << 2 }
 Flags for the map layer. More...
 
enum  PropertyType { Style = 0, Metadata }
 Maplayer has a style and a metadata property. More...
 
enum  ReadFlag { FlagDontResolveLayers = 1 << 0, FlagTrustLayerMetadata = 1 << 1 }
 Flags which control project read behavior. More...
 
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,
  AllStyleCategories
}
 Categories of style to distinguish appropriate sections for import/export. More...
 
- Public Slots inherited from QgsMapLayer
void emitStyleChanged ()
 Triggers an emission of the styleChanged() signal. More...
 
virtual bool setDependencies (const QSet< QgsMapLayerDependency > &layers)
 Sets the list of dependencies. More...
 
void setMaximumScale (double scale)
 Sets the maximum map scale (i.e. More...
 
void setMinimumScale (double scale)
 Sets the minimum map scale (i.e. More...
 
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. More...
 
void setRefreshOnNotifyEnabled (bool enabled)
 Set whether provider notification is connected to triggerRepaint. More...
 
void setScaleBasedVisibility (bool enabled)
 Sets whether scale based visibility is enabled for the layer. More...
 
void triggerRepaint (bool deferredUpdate=false)
 Will advise the map canvas (and any other interested party) that this layer requires to be repainted. More...
 
- Signals inherited from QgsMapLayer
void autoRefreshIntervalChanged (int interval)
 Emitted when the auto refresh interval changes. More...
 
void beforeResolveReferences (QgsProject *project)
 Emitted when all layers are loaded and references can be resolved, just before the references of this layer are resolved. More...
 
void blendModeChanged (QPainter::CompositionMode blendMode)
 Signal emitted when the blend mode is changed, through QgsMapLayer::setBlendMode() More...
 
void configChanged ()
 Emitted whenever the configuration is changed. More...
 
void crsChanged ()
 Emit a signal that layer's CRS has been reset. More...
 
void dataChanged ()
 Data of layer changed. More...
 
void dataSourceChanged ()
 Emitted whenever the layer's data source has been changed. More...
 
void dependenciesChanged ()
 Emitted when dependencies are changed. More...
 
void flagsChanged ()
 Emitted when layer's flags have been modified. More...
 
void isValidChanged ()
 Emitted when the validity of this layer changed. More...
 
void legendChanged ()
 Signal emitted when legend of the layer has changed. More...
 
void metadataChanged ()
 Emitted when the layer's metadata is changed. More...
 
void nameChanged ()
 Emitted when the name has been changed. More...
 
void recalculateExtents () const
 This is used to send a request that any mapcanvas using this layer update its extents. More...
 
void renderer3DChanged ()
 Signal emitted when 3D renderer associated with the layer has changed. More...
 
void rendererChanged ()
 Signal emitted when renderer is changed. More...
 
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. More...
 
void statusChanged (const QString &status)
 Emit a signal with status (e.g. to be caught by QgisApp and display a msg on status bar) More...
 
void styleChanged ()
 Signal emitted whenever a change affects the layer's style. More...
 
void styleLoaded (QgsMapLayer::StyleCategories categories)
 Emitted when a style has been loaded. More...
 
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. More...
 
- Static Public Member Functions inherited from QgsMapLayer
static QString extensionPropertyType (PropertyType type)
 Returns the extension of a Property. More...
 
static QString formatLayerName (const QString &name)
 A convenience function to capitalize and format a layer name. More...
 
static QString generateId (const QString &layerName)
 Generates an unique identifier for this layer, the generate ID is prefixed by layerName. More...
 
- Protected Member Functions inherited from QgsMapLayer
void appendError (const QgsErrorMessage &error)
 Add error message. More...
 
void clone (QgsMapLayer *layer) const
 Copies attributes like name, short name, ... More...
 
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. More...
 
void readCommonStyle (const QDomElement &layerElement, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories)
 Read style data common to all layer types. More...
 
void readCustomProperties (const QDomNode &layerNode, const QString &keyStartsWith=QString())
 Read custom properties from project file. More...
 
void readStyleManager (const QDomNode &layerNode)
 Read style manager's configuration (if any). To be called by subclasses. More...
 
void setError (const QgsError &error)
 Sets error message. More...
 
virtual void setExtent (const QgsRectangle &rect)
 Sets the extent. More...
 
void setProviderType (const QString &providerType)
 Sets the providerType (provider key) More...
 
void setValid (bool valid)
 Sets whether layer is valid or not. More...
 
void writeCommonStyle (QDomElement &layerElement, QDomDocument &document, const QgsReadWriteContext &context, StyleCategories categories=AllStyleCategories) const
 Write style data common to all layer types. More...
 
void writeCustomProperties (QDomNode &layerNode, QDomDocument &doc) const
 Write custom properties to project file. More...
 
void writeStyleManager (QDomNode &layerNode, QDomDocument &doc) const
 Write style manager's configuration (if exists). To be called by subclasses. More...
 
- Protected Attributes inherited from QgsMapLayer
QString mAbstract
 Description of the layer. More...
 
QString mAttribution
 Attribution of the layer. More...
 
QString mAttributionUrl
 
QString mDataSource
 Data source description string, varies by layer type. More...
 
QString mDataUrl
 DataUrl of the layer. More...
 
QString mDataUrlFormat
 
QSet< QgsMapLayerDependencymDependencies
 List of layers that may modify this layer on modification. More...
 
QgsError mError
 Error. More...
 
QgsRectangle mExtent
 Extent of the layer. More...
 
bool mIsRefreshOnNofifyEnabled = false
 
QString mKeywordList
 
QString mLayerName
 Name of the layer - used for display. More...
 
QString mLegendUrl
 WMS legend. More...
 
QString mLegendUrlFormat
 
QString mMetadataUrl
 MetadataUrl of the layer. More...
 
QString mMetadataUrlFormat
 
QString mMetadataUrlType
 
QString mProviderKey
 Data provider key (name of the data provider) More...
 
QgsMapLayer::ReadFlags mReadFlags = QgsMapLayer::ReadFlags()
 Read flags. It's up to the subclass to respect these when restoring state from XML. More...
 
QString mRefreshOnNofifyMessage
 
QString mShortName
 
bool mShouldValidateCrs = true
 true if the layer's CRS should be validated and invalid CRSes are not permitted. More...
 
QString mTitle
 
bool mValid = false
 Indicates if the layer is valid and can be drawn. More...
 
- Properties inherited from QgsMapLayer
int autoRefreshInterval
 
QgsCoordinateReferenceSystem crs
 
bool isValid
 
QgsLayerMetadata metadata
 
QString name
 
QgsMapLayerType type
 

Detailed Description

Implements a map layer that is dedicated to rendering of vector tiles.

Vector tiles compared to "ordinary" vector layers are pre-processed data optimized for fast rendering. A dataset is provided with a series of zoom levels for different map scales. Each zoom level has a matrix of tiles that contain actual data. A single vector tile may be a a file stored on a local drive, requested over HTTP request or retrieved from a database.

Content of a vector tile is divided into one or more named sub-layers. Each such sub-layer may contain many features which consist of geometry and attributes. Contrary to traditional vector layers, these sub-layers do not need to have a rigid schema where geometry type and attributes are the same for all features. A single sub-layer may have multiple geometry types in a single tile or have some attributes defined only at particular zoom levels.

Vector tile layer currently does not use the concept of data providers that other layer types use. The process of rendering of vector tiles looks like this:

+-----—+ +---—+ +------—+ | DATA | | RAW | | DECODED | | | --> LOADER --> | | --> DECODER --> | | --> RENDERER | SOURCE | | TILE | | TILE | +-----—+ +---—+ +------—+

Data source is a place from where tiles are fetched from (URL for HTTP access, local files, MBTiles file, GeoPackage file or others. Loader (QgsVectorTileLoader) class takes care of loading data from the data source. The "raw tile" data is just a blob (QByteArray) that is encoded in some way. There are multiple ways how vector tiles are encoded just like there are different formats how to store images. For example, tiles can be encoded using Mapbox Vector Tiles (MVT) format or in GeoJSON. Decoder (QgsVectorTileDecoder) takes care of decoding raw tile data into QgsFeature objects. A decoded tile is essentially an array of vector features for each sub-layer found in the tile - this is what vector tile renderer (QgsVectorTileRenderer) expects and does the map rendering.

To construct a vector tile layer, it is best to use QgsDataSourceUri class and set the following parameters to get a valid encoded URI:

Currently supported data source types:

Currently supported decoders:

Since
QGIS 3.14

Definition at line 83 of file qgsvectortilelayer.h.

Constructor & Destructor Documentation

◆ QgsVectorTileLayer()

QgsVectorTileLayer::QgsVectorTileLayer ( const QString &  path = QString(),
const QString &  baseName = QString() 
)
explicit

Constructs a new vector tile layer.

Definition at line 34 of file qgsvectortilelayer.cpp.

◆ ~QgsVectorTileLayer()

QgsVectorTileLayer::~QgsVectorTileLayer ( )
overridedefault

Member Function Documentation

◆ clone()

QgsVectorTileLayer * QgsVectorTileLayer::clone ( ) const
overridevirtual

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

Returns
a new layer instance
Since
QGIS 3.0

Implements QgsMapLayer.

Definition at line 181 of file qgsvectortilelayer.cpp.

◆ createMapRenderer()

QgsMapLayerRenderer * QgsVectorTileLayer::createMapRenderer ( QgsRenderContext rendererContext)
overridevirtual

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

Since
QGIS 2.4

Implements QgsMapLayer.

Definition at line 188 of file qgsvectortilelayer.cpp.

◆ decodedSource()

QString QgsVectorTileLayer::decodedSource ( const QString &  source,
const QString &  dataProvider,
const QgsReadWriteContext context 
) const
virtual

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 from QgsMapLayer.

Definition at line 505 of file qgsvectortilelayer.cpp.

◆ encodedSource()

QString QgsVectorTileLayer::encodedSource ( const QString &  source,
const QgsReadWriteContext context 
) const
virtual

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 from QgsMapLayer.

Definition at line 475 of file qgsvectortilelayer.cpp.

◆ getRawTile()

QByteArray QgsVectorTileLayer::getRawTile ( QgsTileXYZ  tileID)

Fetches raw tile data for the give tile coordinates.

If failed to fetch tile data, it will return an empty byte array.

Note
This call may issue a network request (depending on the source type) and will block the caller until the request is finished.

Definition at line 596 of file qgsvectortilelayer.cpp.

◆ htmlMetadata()

QString QgsVectorTileLayer::htmlMetadata ( ) const
overridevirtual

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

Since
QGIS 3.0

Reimplemented from QgsMapLayer.

Definition at line 536 of file qgsvectortilelayer.cpp.

◆ isTileBorderRenderingEnabled()

bool QgsVectorTileLayer::isTileBorderRenderingEnabled ( ) const
inline

Returns whether to render also borders of tiles (useful for debugging)

Definition at line 170 of file qgsvectortilelayer.h.

◆ labeling()

QgsVectorTileLabeling * QgsVectorTileLayer::labeling ( ) const

Returns currently assigned labeling.

Definition at line 629 of file qgsvectortilelayer.cpp.

◆ loadDefaultMetadata()

QString QgsVectorTileLayer::loadDefaultMetadata ( bool &  resultFlag)
overridevirtual

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
Since
QGIS 3.0

Reimplemented from QgsMapLayer.

Definition at line 441 of file qgsvectortilelayer.cpp.

◆ loadDefaultStyle() [1/2]

QString QgsVectorTileLayer::loadDefaultStyle ( bool &  resultFlag)
overridevirtual

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
also loadNamedStyle();

Reimplemented from QgsMapLayer.

Definition at line 305 of file qgsvectortilelayer.cpp.

◆ loadDefaultStyle() [2/2]

bool QgsVectorTileLayer::loadDefaultStyle ( QString &  error,
QStringList &  warnings 
)

Loads the default style for the layer, and returns true if the style was successfully loaded.

The error string will be filled with a translated error message if an error occurs during the style load. The warnings list will be populated with any warning messages generated during the style load (e.g. default style properties which could not be converted).

Since
QGIS 3.16

Definition at line 313 of file qgsvectortilelayer.cpp.

◆ readSymbology()

bool QgsVectorTileLayer::readSymbology ( const QDomNode &  node,
QString &  errorMessage,
QgsReadWriteContext context,
StyleCategories  categories = AllStyleCategories 
)
overridevirtual

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.

Implements QgsMapLayer.

Definition at line 216 of file qgsvectortilelayer.cpp.

◆ readXml()

bool QgsVectorTileLayer::readXml ( const QDomNode &  layer_node,
QgsReadWriteContext context 
)
overridevirtual

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

Reimplemented from QgsMapLayer.

Definition at line 193 of file qgsvectortilelayer.cpp.

◆ renderer()

QgsVectorTileRenderer * QgsVectorTileLayer::renderer ( ) const

Returns currently assigned renderer.

Definition at line 618 of file qgsvectortilelayer.cpp.

◆ setLabeling()

void QgsVectorTileLayer::setLabeling ( QgsVectorTileLabeling labeling)

Sets labeling for the map layer.

Note
Takes ownership of the passed labeling

Definition at line 623 of file qgsvectortilelayer.cpp.

◆ setRenderer()

void QgsVectorTileLayer::setRenderer ( QgsVectorTileRenderer r)

Sets renderer for the map layer.

Note
Takes ownership of the passed renderer

Definition at line 612 of file qgsvectortilelayer.cpp.

◆ setTileBorderRenderingEnabled()

void QgsVectorTileLayer::setTileBorderRenderingEnabled ( bool  enabled)
inline

Sets whether to render also borders of tiles (useful for debugging)

Definition at line 168 of file qgsvectortilelayer.h.

◆ setTransformContext()

void QgsVectorTileLayer::setTransformContext ( const QgsCoordinateTransformContext transformContext)
overridevirtual

Sets the coordinate transform context to transformContext.

Since
QGIS 3.8

Implements QgsMapLayer.

Definition at line 300 of file qgsvectortilelayer.cpp.

◆ sourceMaxZoom()

int QgsVectorTileLayer::sourceMaxZoom ( ) const
inline

Returns maximum zoom level at which source has any valid tiles (negative = unconstrained)

Definition at line 140 of file qgsvectortilelayer.h.

◆ sourceMinZoom()

int QgsVectorTileLayer::sourceMinZoom ( ) const
inline

Returns minimum zoom level at which source has any valid tiles (negative = unconstrained)

Definition at line 138 of file qgsvectortilelayer.h.

◆ sourcePath()

QString QgsVectorTileLayer::sourcePath ( ) const
inline

Returns URL/path of the data source (syntax different to each data source type)

Definition at line 135 of file qgsvectortilelayer.h.

◆ sourceType()

QString QgsVectorTileLayer::sourceType ( ) const
inline

Returns type of the data source.

Definition at line 133 of file qgsvectortilelayer.h.

◆ writeSymbology()

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

Write the style for the layer into the docment 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.

Implements QgsMapLayer.

Definition at line 271 of file qgsvectortilelayer.cpp.

◆ writeXml()

bool QgsVectorTileLayer::writeXml ( QDomNode &  layer_node,
QDomDocument &  document,
const QgsReadWriteContext context 
) const
overridevirtual

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

Reimplemented from QgsMapLayer.

Definition at line 205 of file qgsvectortilelayer.cpp.


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