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5f5c1ddb15
A new class QgsPathResolver is introduced for conversion between absolute and relative paths when reading/writing XML. Cleaned up code in layer definition file support (.qlr) to better handle relative/absolute path conversion.
750 lines
27 KiB
Plaintext
750 lines
27 KiB
Plaintext
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/** \class QgsMapLayer
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* \brief Base class for all map layer types.
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* This class is the base class for all map layer types (vector, raster).
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*/
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class QgsMapLayer : QObject
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{
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%TypeHeaderCode
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#include <qgsmaplayer.h>
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%End
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%ConvertToSubClassCode
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QgsMapLayer* layer = qobject_cast<QgsMapLayer*>( sipCpp );
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sipType = 0;
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if ( layer )
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{
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if (layer->type() == QgsMapLayer::VectorLayer)
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{
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sipType = sipType_QgsVectorLayer;
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}
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else if (layer->type() == QgsMapLayer::RasterLayer)
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{
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sipType = sipType_QgsRasterLayer;
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}
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else if (layer->type() == QgsMapLayer::PluginLayer)
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{
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sipType = sipType_QgsPluginLayer;
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}
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}
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%End
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public:
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//! Types of layers that can be added to a map
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enum LayerType
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{
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VectorLayer,
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RasterLayer,
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PluginLayer
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};
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/** Constructor for QgsMapLayer
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* @param type layer type
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* @param name display name for the layer
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* @param source datasource of layer
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*/
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QgsMapLayer( QgsMapLayer::LayerType type = VectorLayer, const QString& name = QString::null, const QString& source = QString::null );
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virtual ~QgsMapLayer();
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/** Returns the type of the layer.
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*/
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QgsMapLayer::LayerType type() const;
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/** Returns the layer's unique ID, which is used to access this layer from QgsProject. */
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QString id() const;
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/**
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* Set the display name of the layer
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* @param name new name for the layer
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* @note added in 2.16
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* @see name()
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*/
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void setName( const QString& name );
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/** Returns the display name of the layer.
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* @return the layer name
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* @see setName()
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*/
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QString name() const;
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/** Returns the original name of the layer.
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* @return the original layer name
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*/
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QString originalName() const;
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/** Sets the short name of the layer
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* used by QGIS Server to identify the layer.
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* @return the layer short name
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* @see shortName()
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*/
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void setShortName( const QString& shortName );
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/** Returns the short name of the layer
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* used by QGIS Server to identify the layer.
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* @return the layer short name
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* @see setShortName()
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*/
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QString shortName() const;
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/** Sets the title of the layer
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* used by QGIS Server in GetCapabilities request.
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* @return the layer title
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* @see title()
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*/
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void setTitle( const QString& title );
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/** Returns the title of the layer
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* used by QGIS Server in GetCapabilities request.
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* @return the layer title
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* @see setTitle()
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*/
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QString title() const;
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/** Sets the abstract of the layer
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* used by QGIS Server in GetCapabilities request.
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* @return the layer abstract
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* @see abstract()
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*/
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void setAbstract( const QString& abstract );
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/** Returns the abstract of the layer
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* used by QGIS Server in GetCapabilities request.
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* @return the layer abstract
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* @see setAbstract()
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*/
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QString abstract() const;
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/** Sets the keyword list of the layer
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* used by QGIS Server in GetCapabilities request.
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* @return the layer keyword list
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* @see keywordList()
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*/
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void setKeywordList( const QString& keywords );
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/** Returns the keyword list of the layer
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* used by QGIS Server in GetCapabilities request.
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* @return the layer keyword list
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* @see setKeywordList()
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*/
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QString keywordList() const;
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/* Layer dataUrl information */
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/** Sets the DataUrl of the layer
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* used by QGIS Server in GetCapabilities request.
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* DataUrl is a a link to the underlying data represented by a particular layer.
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* @return the layer DataUrl
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* @see dataUrl()
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*/
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void setDataUrl( const QString& dataUrl );
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/** Returns the DataUrl of the layer
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* used by QGIS Server in GetCapabilities request.
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* DataUrl is a a link to the underlying data represented by a particular layer.
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* @return the layer DataUrl
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* @see setDataUrl()
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*/
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QString dataUrl() const;
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/** Sets the DataUrl format of the layer
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* used by QGIS Server in GetCapabilities request.
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* DataUrl is a a link to the underlying data represented by a particular layer.
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* @return the layer DataUrl format
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* @see dataUrlFormat()
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*/
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void setDataUrlFormat( const QString& dataUrlFormat );
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/** Returns the DataUrl format of the layer
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* used by QGIS Server in GetCapabilities request.
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* DataUrl is a a link to the underlying data represented by a particular layer.
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* @return the layer DataUrl format
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* @see setDataUrlFormat()
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*/
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QString dataUrlFormat() const;
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/* Layer attribution information */
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/** Sets the attribution of the layer
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* used by QGIS Server in GetCapabilities request.
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* Attribution indicates the provider of a layer or collection of layers.
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* @return the layer attribution
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* @see attribution()
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*/
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void setAttribution( const QString& attrib );
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/** Returns the attribution of the layer
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* used by QGIS Server in GetCapabilities request.
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* Attribution indicates the provider of a layer or collection of layers.
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* @return the layer attribution
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* @see setAttribution()
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*/
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QString attribution() const;
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/** Sets the attribution URL of the layer
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* used by QGIS Server in GetCapabilities request.
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* Attribution indicates the provider of a layer or collection of layers.
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* @return the layer attribution URL
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* @see attributionUrl()
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*/
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void setAttributionUrl( const QString& attribUrl );
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/** Returns the attribution URL of the layer
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* used by QGIS Server in GetCapabilities request.
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* Attribution indicates the provider of a layer or collection of layers.
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* @return the layer attribution URL
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* @see setAttributionUrl()
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*/
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QString attributionUrl() const;
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/* Layer metadataUrl information */
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/** Sets the metadata URL of the layer
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* used by QGIS Server in GetCapabilities request.
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* MetadataUrl is a a link to the detailed, standardized metadata about the data.
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* @return the layer metadata URL
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* @see metadataUrl()
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*/
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void setMetadataUrl( const QString& metaUrl );
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/** Returns the metadata URL of the layer
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* used by QGIS Server in GetCapabilities request.
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* MetadataUrl is a a link to the detailed, standardized metadata about the data.
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* @return the layer metadata URL
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* @see setMetadataUrl()
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*/
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QString metadataUrl() const;
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/** Set the metadata type of the layer
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* used by QGIS Server in GetCapabilities request
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* MetadataUrlType indicates the standard to which the metadata complies.
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* @return the layer metadata type
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* @see metadataUrlType()
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*/
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void setMetadataUrlType( const QString& metaUrlType );
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/** Returns the metadata type of the layer
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* used by QGIS Server in GetCapabilities request.
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* MetadataUrlType indicates the standard to which the metadata complies.
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* @return the layer metadata type
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* @see setMetadataUrlType()
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*/
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QString metadataUrlType() const;
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/** Sets the metadata format of the layer
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* used by QGIS Server in GetCapabilities request.
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* MetadataUrlType indicates how the metadata is structured.
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* @return the layer metadata format
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* @see metadataUrlFormat()
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*/
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void setMetadataUrlFormat( const QString& metaUrlFormat );
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/** Returns the metadata format of the layer
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* used by QGIS Server in GetCapabilities request.
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* MetadataUrlType indicates how the metadata is structured.
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* @return the layer metadata format
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* @see setMetadataUrlFormat()
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*/
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QString metadataUrlFormat() const;
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/** Set the blending mode used for rendering a layer.
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* @param blendMode new blending mode
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* @see blendMode()
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*/
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void setBlendMode( QPainter::CompositionMode blendMode );
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/** Returns the current blending mode for a layer.
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* @see setBlendMode()
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*/
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QPainter::CompositionMode blendMode() const;
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/** Returns if this layer is read only. */
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bool readOnly() const;
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/** Synchronises with changes in the datasource
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*/
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virtual void reload();
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/** Return new instance of QgsMapLayerRenderer that will be used for rendering of given context
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* @note added in 2.4
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*/
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virtual QgsMapLayerRenderer* createMapRenderer( QgsRenderContext& rendererContext ) = 0 /Factory/;
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/** Returns the extent of the layer. */
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virtual QgsRectangle extent() const;
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/** Return the status of the layer. An invalid layer is one which has a bad datasource
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* or other problem. Child classes set this flag when initialized.
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* @return true if the layer is valid and can be accessed
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*/
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bool isValid() const;
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/** Gets a version of the internal layer definition that has sensitive
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* bits removed (for example, the password). This function should
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* be used when displaying the source name for general viewing.
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* @see source()
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*/
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QString publicSource() const;
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/** Returns the source for the layer. This source may contain usernames, passwords
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* and other sensitive information.
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* @see publicSource()
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*/
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QString source() const;
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/**
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* Returns the sublayers of this layer
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* (Useful for providers that manage their own layers, such as WMS)
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*/
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virtual QStringList subLayers() const;
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/**
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* Reorders the *previously selected* sublayers of this layer from bottom to top.
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* (Useful for providers that manage their own layers, such as WMS).
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*/
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virtual void setLayerOrder( const QStringList &layers );
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/** Set the visibility of the given sublayer name.
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* @param name sublayer name
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* @param visible sublayer visibility
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*/
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virtual void setSubLayerVisibility( const QString& name, bool visible );
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/** Returns true if the layer can be edited. */
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virtual bool isEditable() const;
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/** Returns true if the layer is considered a spatial layer, ie it has some form of geometry associated with it.
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* @note added in QGIS 2.16
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*/
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virtual bool isSpatial() const;
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bool readLayerXml( const QDomElement& layerElement, const QgsPathResolver& pathResolver );
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bool writeLayerXml( QDomElement& layerElement, QDomDocument& document, const QgsPathResolver& pathResolver ) const;
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/** Set a custom property for layer. Properties are stored in a map and saved in project file.
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* @see customProperty()
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* @see removeCustomProperty()
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*/
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void setCustomProperty( const QString& key, const QVariant& value );
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/** Read a custom property from layer. Properties are stored in a map and saved in project file.
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* @see setCustomProperty()
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*/
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QVariant customProperty( const QString& value, const QVariant& defaultValue = QVariant() ) const;
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/** Remove a custom property from layer. Properties are stored in a map and saved in project file.
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* @see setCustomProperty()
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*/
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void removeCustomProperty( const QString& key );
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/** Get current status error. This error describes some principal problem
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* for which layer cannot work and thus is not valid. It is not last error
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* after accessing data by draw() etc.
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*/
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virtual QgsError error() const;
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/** Returns the layer's spatial reference system.
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@note This was introduced in QGIS 1.4
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*/
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QgsCoordinateReferenceSystem crs() const;
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/** Sets layer's spatial reference system */
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void setCrs( const QgsCoordinateReferenceSystem& srs, bool emitSignal = true );
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/** A convenience function to (un)capitalize the layer name */
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static QString capitalizeLayerName( const QString& name );
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/** Retrieve the style URI for this layer
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* (either as a .qml file on disk or as a
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* record in the users style table in their personal qgis.db)
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* @return a QString with the style file name
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* @see also loadNamedStyle () and saveNamedStyle ();
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*/
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virtual QString styleURI() const;
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/** Retrieve the default style for this layer if one
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* exists (either as a .qml file on disk or as a
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* record in the users style table in their personal qgis.db)
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* @param resultFlag a reference to a flag that will be set to false if
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* we did not manage to load the default style.
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* @return a QString with any status messages
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* @see also loadNamedStyle ();
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*/
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virtual QString loadDefaultStyle( bool & resultFlag /Out/ );
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/** Retrieve a named style for this layer if one
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* exists (either as a .qml file on disk or as a
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* record in the users style table in their personal qgis.db)
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* @param uri - the file name or other URI for the
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* style file. First an attempt will be made to see if this
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* is a file and load that, if that fails the qgis.db styles
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* table will be consulted to see if there is a style who's
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* key matches the URI.
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* @param resultFlag a reference to a flag that will be set to false if
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* we did not manage to load the default style.
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* @return a QString with any status messages
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* @see also loadDefaultStyle ();
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*/
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virtual QString loadNamedStyle( const QString& uri, bool &resultFlag /Out/ );
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/** Retrieve a named style for this layer from a sqlite database.
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* @param db path to sqlite database
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* @param uri uri for table
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* @param qml will be set to QML style content from database
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* @returns true if style was successfully loaded
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*/
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virtual bool loadNamedStyleFromDatabase( const QString &db, const QString &uri, QString &qml /Out/ );
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/**
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* Import the properties of this layer from a QDomDocument
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* @param doc source QDomDocument
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* @param errorMsg this QString will be initialized on error
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* during the execution of readSymbology
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* @return true on success
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* @note added in 2.8
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*/
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virtual bool importNamedStyle( QDomDocument& doc, QString &errorMsg /Out/ );
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/**
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* Export the properties of this layer as named style in a QDomDocument
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* @param doc the target QDomDocument
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* @param errorMsg this QString will be initialized on error
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* during the execution of writeSymbology
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*/
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virtual void exportNamedStyle( QDomDocument &doc, QString &errorMsg ) const;
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/**
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* Export the properties of this layer as SLD style in a QDomDocument
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* @param doc the target QDomDocument
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* @param errorMsg this QString will be initialized on error
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* during the execution of writeSymbology
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*/
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virtual void exportSldStyle( QDomDocument &doc, QString &errorMsg ) const;
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/** Save the properties of this layer as the default style
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* (either as a .qml file on disk or as a
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* record in the users style table in their personal qgis.db)
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* @param resultFlag a reference to a flag that will be set to false if
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* we did not manage to save the default style.
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* @return a QString with any status messages
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* @sa loadNamedStyle() and @see saveNamedStyle()
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*/
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virtual QString saveDefaultStyle( bool & resultFlag /Out/ );
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/** Save the properties of this layer as a named style
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* (either as a .qml file on disk or as a
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* record in the users style table in their personal qgis.db)
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* @param uri the file name or other URI for the
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* style file. First an attempt will be made to see if this
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* is a file and save to that, if that fails the qgis.db styles
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* table will be used to create a style entry who's
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* key matches the URI.
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* @param resultFlag a reference to a flag that will be set to false if
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* we did not manage to save the default style.
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* @return a QString with any status messages
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* @sa saveDefaultStyle()
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*/
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virtual QString saveNamedStyle( const QString &uri, bool &resultFlag /Out/ );
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/** Saves the properties of this layer to an SLD format file.
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* @param uri uri of destination for exported SLD file.
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* @param resultFlag a reference to a flag that will be set to false if
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* the SLD file could not be generated
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* @returns a string with any status or error messages
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* @see loadSldStyle()
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*/
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virtual QString saveSldStyle( const QString &uri, bool &resultFlag ) const;
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/** Attempts to style the layer using the formatting from an SLD type file.
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* @param uri uri of source SLD file
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* @param resultFlag a reference to a flag that will be set to false if
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* the SLD file could not be loaded
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* @returns a string with any status or error messages
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* @see saveSldStyle()
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*/
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virtual QString loadSldStyle( const QString &uri, bool &resultFlag );
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virtual bool readSld( const QDomNode &node, QString &errorMessage );
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/** Read the symbology for the current layer from the Dom node supplied.
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* @param node node that will contain the symbology definition for this layer.
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* @param errorMessage reference to string that will be updated with any error messages
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* @return true in case of success.
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*/
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virtual bool readSymbology( const QDomNode& node, QString& errorMessage ) = 0;
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/** Read the style for the current layer from the Dom node supplied.
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* @param node node that will contain the style definition for this layer.
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* @param errorMessage reference to string that will be updated with any error messages
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* @return true in case of success.
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* @note added in 2.16
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* @note To be implemented in subclasses. Default implementation does nothing and returns false.
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*/
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virtual bool readStyle( const QDomNode& node, QString& errorMessage );
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/** Write the symbology for the layer into the docment provided.
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* @param node the node that will have the style element added to it.
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* @param doc the document that will have the QDomNode added.
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* @param errorMessage reference to string that will be updated with any error messages
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* @return true in case of success.
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*/
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virtual bool writeSymbology( QDomNode &node, QDomDocument& doc, QString& errorMessage ) const = 0;
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/** Write just the style information for the layer into the document
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* @param node the node that will have the style element added to it.
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* @param doc the document that will have the QDomNode added.
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* @param errorMessage reference to string that will be updated with any error messages
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* @return true in case of success.
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* @note added in 2.16
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* @note To be implemented in subclasses. Default implementation does nothing and returns false.
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*/
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virtual bool writeStyle( QDomNode& node, QDomDocument& doc, QString& errorMessage ) const;
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/** Return pointer to layer's undo stack */
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QUndoStack *undoStack();
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/** Return pointer to layer's style undo stack
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* @note added in 2.16
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*/
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QUndoStack *undoStackStyles();
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/* Layer legendUrl information */
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void setLegendUrl( const QString& legendUrl );
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QString legendUrl() const;
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void setLegendUrlFormat( const QString& legendUrlFormat );
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QString legendUrlFormat() const;
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/**
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* Assign a legend controller to the map layer. The object will be responsible for providing legend items.
|
|
* @param legend Takes ownership of the object. Can be null pointer
|
|
* @note added in 2.6
|
|
*/
|
|
void setLegend( QgsMapLayerLegend* legend /Transfer/ );
|
|
/**
|
|
* Can be null.
|
|
* @note added in 2.6
|
|
*/
|
|
QgsMapLayerLegend* legend() const;
|
|
|
|
/**
|
|
* Get access to the layer's style manager. Style manager allows switching between multiple styles.
|
|
* @note added in 2.8
|
|
*/
|
|
QgsMapLayerStyleManager* styleManager() const;
|
|
|
|
/** Tests whether the layer should be visible at the specified scale.
|
|
* @param scale scale denominator to test
|
|
* @returns true if the layer is visible at the given scale.
|
|
* @note added in QGIS 2.16
|
|
* @see minimumScale()
|
|
* @see maximumScale()
|
|
* @see hasScaleBasedVisibility()
|
|
*/
|
|
bool isInScaleRange( double scale ) const;
|
|
|
|
/** Returns the minimum scale denominator at which the layer is visible.
|
|
* Scale based visibility is only used if hasScaleBasedVisibility is true.
|
|
* @returns minimum scale denominator at which the layer will render
|
|
* @see setMinimumScale()
|
|
* @see maximumScale()
|
|
* @see hasScaleBasedVisibility()
|
|
* @see isInScaleRange()
|
|
*/
|
|
double minimumScale() const;
|
|
|
|
/** Returns the maximum scale denominator at which the layer is visible.
|
|
* Scale based visibility is only used if hasScaleBasedVisibility is true.
|
|
* @returns minimum scale denominator at which the layer will render
|
|
* @see setMaximumScale()
|
|
* @see minimumScale()
|
|
* @see hasScaleBasedVisibility()
|
|
* @see isInScaleRange()
|
|
*/
|
|
double maximumScale() const;
|
|
|
|
/** Returns whether scale based visibility is enabled for the layer.
|
|
* @returns true if scale based visibility is enabled
|
|
* @see minimumScale()
|
|
* @see maximumScale()
|
|
* @see setScaleBasedVisibility()
|
|
* @see isInScaleRange()
|
|
*/
|
|
bool hasScaleBasedVisibility() const;
|
|
|
|
bool hasAutoRefreshEnabled() const;
|
|
int autoRefreshInterval() const;
|
|
void setAutoRefreshInterval( int interval );
|
|
void setAutoRefreshEnabled( bool enabled );
|
|
|
|
public slots:
|
|
|
|
/** Event handler for when a coordinate transform fails due to bad vertex error */
|
|
virtual void invalidTransformInput();
|
|
|
|
/** Sets the minimum scale denominator at which the layer will be visible.
|
|
* Scale based visibility is only used if setScaleBasedVisibility is set to true.
|
|
* @param scale minimum scale denominator at which the layer should render
|
|
* @see minimumScale
|
|
* @see setMaximumScale
|
|
* @see setScaleBasedVisibility
|
|
*/
|
|
void setMinimumScale( double scale );
|
|
|
|
/** Sets the maximum scale denominator at which the layer will be visible.
|
|
* Scale based visibility is only used if setScaleBasedVisibility is set to true.
|
|
* @param scale maximum scale denominator at which the layer should render
|
|
* @see maximumScale
|
|
* @see setMinimumScale
|
|
* @see setScaleBasedVisibility
|
|
*/
|
|
void setMaximumScale( double scale );
|
|
|
|
/** Sets whether scale based visibility is enabled for the layer.
|
|
* @param enabled set to true to enable scale based visibility
|
|
* @see setMinimumScale
|
|
* @see setMaximumScale
|
|
* @see scaleBasedVisibility
|
|
*/
|
|
void setScaleBasedVisibility( const bool enabled );
|
|
|
|
void triggerRepaint( bool deferredUpdate = false );
|
|
|
|
/** \brief Obtain Metadata for this layer */
|
|
virtual QString metadata() const;
|
|
|
|
/** Time stamp of data source in the moment when data/metadata were loaded by provider */
|
|
virtual QDateTime timestamp() const;
|
|
|
|
/** Triggers an emission of the styleChanged() signal.
|
|
* @note added in QGIS 2.16
|
|
*/
|
|
void emitStyleChanged();
|
|
|
|
/**
|
|
* Sets the list of dependencies.
|
|
* @see dependencies()
|
|
*
|
|
* @param layers set of QgsMapLayerDependency. Only user-defined dependencies will be added
|
|
* @returns false if a dependency cycle has been detected
|
|
* @note added in QGIS 3.0
|
|
*/
|
|
virtual bool setDependencies( const QSet<QgsMapLayerDependency>& layers );
|
|
|
|
/**
|
|
* Gets the list of dependencies. This includes data dependencies set by the user (@see setDataDependencies)
|
|
* as well as dependencies given by the provider
|
|
*
|
|
* @returns a set of QgsMapLayerDependency
|
|
* @note added in QGIS 3.0
|
|
*/
|
|
virtual QSet<QgsMapLayerDependency> dependencies() const;
|
|
|
|
signals:
|
|
|
|
/** Emit a signal with status (e.g. to be caught by QgisApp and display a msg on status bar) */
|
|
void statusChanged( const QString& status );
|
|
|
|
/**
|
|
* Emitted when the name has been changed
|
|
*
|
|
* @note added in 2.16
|
|
*/
|
|
void nameChanged();
|
|
|
|
/** Emit a signal that layer's CRS has been reset */
|
|
void crsChanged();
|
|
|
|
void repaintRequested( bool deferredUpdate = false );
|
|
|
|
/** This is used to send a request that any mapcanvas using this layer update its extents */
|
|
void recalculateExtents() const;
|
|
|
|
/** Data of layer changed */
|
|
void dataChanged();
|
|
|
|
/** Signal emitted when the blend mode is changed, through QgsMapLayer::setBlendMode() */
|
|
void blendModeChanged( QPainter::CompositionMode blendMode );
|
|
|
|
/** Signal emitted when renderer is changed.
|
|
* @see styleChanged()
|
|
*/
|
|
void rendererChanged();
|
|
|
|
/** 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.
|
|
* @note added in QGIS 2.16
|
|
* @see rendererChanged()
|
|
*/
|
|
void styleChanged();
|
|
|
|
/**
|
|
* Signal emitted when legend of the layer has changed
|
|
* @note added in 2.6
|
|
*/
|
|
void legendChanged();
|
|
|
|
/**
|
|
* Emitted whenever the configuration is changed. The project listens to this signal
|
|
* to be marked as dirty.
|
|
*/
|
|
void configChanged();
|
|
|
|
/**
|
|
* Emitted when dependencies are changed.
|
|
*/
|
|
void dependenciesChanged();
|
|
|
|
/**
|
|
* 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.
|
|
* @note added in QGIS 3.0
|
|
*/
|
|
void willBeDeleted();
|
|
|
|
void autoRefreshIntervalChanged( int interval );
|
|
|
|
protected:
|
|
/** Set the extent */
|
|
virtual void setExtent( const QgsRectangle &rect );
|
|
|
|
/** Set whether layer is valid or not - should be used in constructor. */
|
|
void setValid( bool valid );
|
|
|
|
/** Called by readLayerXML(), used by children to read state specific to them from
|
|
* project files.
|
|
*/
|
|
virtual bool readXml( const QDomNode& layer_node );
|
|
|
|
/** Called by writeLayerXML(), used by children to write state specific to them to
|
|
* project files.
|
|
*/
|
|
virtual bool writeXml( QDomNode & layer_node, QDomDocument & document ) const;
|
|
|
|
|
|
/** Read custom properties from project file.
|
|
@param layerNode note to read from
|
|
@param keyStartsWith reads only properties starting with the specified string (or all if the string is empty)*/
|
|
void readCustomProperties( const QDomNode& layerNode, const QString& keyStartsWith = "" );
|
|
|
|
/** Write custom properties to project file. */
|
|
void writeCustomProperties( QDomNode & layerNode, QDomDocument & doc ) const;
|
|
|
|
/** Read style manager's configuration (if any). To be called by subclasses. */
|
|
void readStyleManager( const QDomNode& layerNode );
|
|
/** Write style manager's configuration (if exists). To be called by subclasses. */
|
|
void writeStyleManager( QDomNode& layerNode, QDomDocument& doc ) const;
|
|
|
|
|
|
/** Add error message */
|
|
void appendError( const QgsErrorMessage &error );
|
|
/** Set error message */
|
|
void setError( const QgsError &error );
|
|
|
|
//! Checks if new change dependency candidates introduce a cycle
|
|
bool hasDependencyCycle( const QSet<QgsMapLayerDependency>& layersIds ) const;
|
|
};
|