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

#include <qgsvectortilelayer.h>

Inheritance diagram for QgsVectorTileLayer:

Public Member Functions
	QgsVectorTileLayer (const QString &path=QString(), const QString &baseName=QString())
	Constructs a new vector tile layer. More...

	~QgsVectorTileLayer () override

QgsVectorTileLayer *	clone () const override
	Returns a new instance equivalent to this one except for the id which is still unique. More...

QgsMapLayerRenderer *	createMapRenderer (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...

QgsVectorTileLabeling *	labeling () 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...

QgsVectorTileRenderer *	renderer () 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 QgsObjectCustomProperties &	customProperties () 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 QgsDataProvider *	dataProvider ()
	Returns the layer's data provider, it may be `nullptr`. More...

virtual const QgsDataProvider *	dataProvider () 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< QgsMapLayerDependency >	dependencies () 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...

QgsMapLayerLegend *	legend () 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 QgsLayerMetadata &	metadata () 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...

QgsMapLayer &	operator= (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...

QgsAbstract3DRenderer *	renderer3D () 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...

QgsMapLayerStyleManager *	styleManager () 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 QgsMapLayerTemporalProperties *	temporalProperties ()
	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< QgsMapLayerDependency >	mDependencies
	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 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:

"type" - what kind of data source will be used
"url" - URL or path of the data source (specific to each data source type, see below)

Currently supported data source types:

"xyz" - the "url" should be a template like http://example.com/{z}/{x}/{y}.pbf where {x},{y},{z} will be replaced by tile coordinates
"mbtiles" - tiles read from a MBTiles file (a SQLite database)

Currently supported decoders:

MVT - following Mapbox Vector Tiles specification

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

source	data source to decode, typically read from layer's DOM element "datasource"
dataProvider	string identification of data provider (e.g. "ogr"), typically read from layer's DOM element
context	reading 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

source	data source to encode, typically QgsMapLayer::source()
context	writing 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

resultFlag a 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

resultFlag a 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

node	node that will contain the symbology definition for this layer.
errorMessage	reference to string that will be updated with any error messages
context	reading context (used for transform from relative to absolute paths)
categories	the 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

node	the node that will have the style element added to it.
doc	the document that will have the QDomNode added.
errorMessage	reference to string that will be updated with any error messages
context	writing context (used for transform from absolute to relative paths)
categories	the 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:

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

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ QgsVectorTileLayer()

◆ ~QgsVectorTileLayer()

Member Function Documentation

◆ clone()

◆ createMapRenderer()

◆ decodedSource()

◆ encodedSource()

◆ getRawTile()

◆ htmlMetadata()

◆ isTileBorderRenderingEnabled()

◆ labeling()

◆ loadDefaultMetadata()

◆ loadDefaultStyle() [1/2]

◆ loadDefaultStyle() [2/2]

◆ readSymbology()

◆ readXml()

◆ renderer()

◆ setLabeling()

◆ setRenderer()

◆ setTileBorderRenderingEnabled()

◆ setTransformContext()

◆ sourceMaxZoom()

◆ sourceMinZoom()

◆ sourcePath()

◆ sourceType()

◆ writeSymbology()

◆ writeXml()