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QGIS/python/core/qgsvectorlayer.sip

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typedef QList<int> QgsAttributeList;
typedef QSet<int> QgsAttributeIds;
class QgsAttributeEditorElement : QObject
{
%TypeHeaderCode
#include "qgsvectorlayer.h"
%End
%ConvertToSubClassCode
QgsAttributeEditorElement* e = qobject_cast<QgsAttributeEditorElement*>( sipCpp );
sipClass = 0;
if ( e )
{
switch ( e->type() )
{
case QgsAttributeEditorElement::AeTypeContainer: sipClass = sipClass_QgsAttributeEditorContainer; break;
case QgsAttributeEditorElement::AeTypeField: sipClass = sipClass_QgsAttributeEditorField; break;
case QgsAttributeEditorElement::AeTypeRelation: sipClass = sipClass_QgsAttributeEditorRelation; break;
}
}
%End
public:
enum AttributeEditorType
{
AeTypeContainer,
AeTypeField,
AeTypeRelation,
AeTypeInvalid
};
QgsAttributeEditorElement( AttributeEditorType type, QString name, QObject *parent /TransferThis/ = NULL );
virtual ~QgsAttributeEditorElement();
QString name() const;
AttributeEditorType type() const;
virtual QDomElement toDomElement( QDomDocument& doc ) const = 0;
};
class QgsAttributeEditorContainer : QgsAttributeEditorElement
{
%TypeHeaderCode
#include "qgsvectorlayer.h"
%End
public:
QgsAttributeEditorContainer( QString name, QObject *parent /TransferThis/ );
~QgsAttributeEditorContainer();
virtual QDomElement toDomElement( QDomDocument& doc ) const;
virtual void addChildElement( QgsAttributeEditorElement *widget );
virtual void setIsGroupBox( bool isGroupBox );
virtual bool isGroupBox() const;
virtual void setName( const QString& name );
QList<QgsAttributeEditorElement*> children() const;
};
class QgsAttributeEditorField : QgsAttributeEditorElement
{
%TypeHeaderCode
#include "qgsvectorlayer.h"
%End
public:
QgsAttributeEditorField( QString name, int idx, QObject *parent /TransferThis/ );
~QgsAttributeEditorField();
virtual QDomElement toDomElement( QDomDocument& doc ) const;
int idx() const;
};
/** @note Added in 2.1 */
class QgsAttributeEditorRelation : QgsAttributeEditorElement
{
public:
QgsAttributeEditorRelation( QString name, const QString &relationId, QObject *parent /TransferThis/ );
QgsAttributeEditorRelation( QString name, const QgsRelation& relation, QObject *parent /TransferThis/);
~QgsAttributeEditorRelation();
virtual QDomElement toDomElement( QDomDocument& doc ) const;
const QgsRelation& relation() const;
/**
* Initializes the relation from the id
*
* @param relManager The relation manager to use for the initialization
* @return true if the relation was found in the relationmanager
*/
bool init( QgsRelationManager *relManager );
};
struct QgsVectorJoinInfo
{
%TypeHeaderCode
#include "qgsvectorlayer.h"
%End
/** Join field in the target layer*/
QString targetFieldName;
/** Source layer*/
QString joinLayerId;
/** Join field in the source layer*/
QString joinFieldName;
/** True if the join is cached in virtual memory*/
bool memoryCache;
/** Cache for joined attributes to provide fast lookup (size is 0 if no memory caching)
@note not available in python bindings
*/
// QHash< QString, QgsAttributeMap> cachedAttributes;
bool operator==( const QgsVectorJoinInfo& other ) const;
/** An optional prefix. If it is a Null string "{layername}_" will be used
* @note Added in 2.8
*/
QString prefix;
/** Set subset of fields to be used from joined layer. Takes ownership of the passed pointer. Null pointer tells to use all fields.
@note added in 2.6 */
void setJoinFieldNamesSubset( QStringList* fieldNamesSubset /Transfer/ );
/** Get subset of fields to be used from joined layer. All fields will be used if null is returned.
@note added in 2.6 */
QStringList* joinFieldNamesSubset() const;
};
class QgsVectorLayer : QgsMapLayer
{
%TypeHeaderCode
#include "qgsvectorlayer.h"
%End
public:
/** The different types to layout the attribute editor. */
enum EditorLayout
{
GeneratedLayout,
TabLayout,
UiFileLayout
};
/**
* @deprecated Use the editorWidgetV2() system instead
*/
enum EditType
{
LineEdit,
UniqueValues,
UniqueValuesEditable,
ValueMap,
Classification,
EditRange,
SliderRange,
CheckBox,
FileName,
Enumeration,
Immutable, /**< The attribute value should not be changed in the attribute form */
Hidden, /**< The attribute value should not be shown in the attribute form */
TextEdit, /**< multiline edit */
Calendar, /**< calendar widget */
DialRange, /**< dial range */
ValueRelation, /**< value map from an table */
UuidGenerator, /**< uuid generator - readonly and automatically intialized */
Photo, /**< phote widget */
WebView, /**< webview widget */
Color, /**< color */
EditorWidgetV2, /**< modularized edit widgets @note added in 2.1 */
};
/** Types of feature form suppression after feature creation
* @note added in 2.1 */
enum FeatureFormSuppress
{
SuppressDefault, // use the application-wide setting
SuppressOn,
SuppressOff,
};
struct RangeData
{
RangeData();
RangeData( QVariant theMin, QVariant theMax, QVariant theStep );
QVariant mMin;
QVariant mMax;
QVariant mStep;
};
struct ValueRelationData
{
ValueRelationData();
ValueRelationData( QString layer, QString key, QString value, bool allowNull, bool orderByValue,
bool allowMulti = false,
QString filterExpression = QString::null );
QString mLayer;
QString mKey;
QString mValue;
QString mFilterExpression;
bool mAllowNull;
bool mOrderByValue;
bool mAllowMulti; /* allow selection of multiple keys */
};
struct GroupData
{
GroupData();
GroupData( QString name, QList<QString> fields );
QString mName;
QList<QString> mFields;
};
struct TabData
{
TabData();
TabData( QString name, QList<QString> fields, QList<QgsVectorLayer::GroupData> groups );
QString mName;
QList<QString> mFields;
QList<QgsVectorLayer::GroupData> mGroups;
};
/** Constructor - creates a vector layer
*
* The QgsVectorLayer is constructed by instantiating a data provider. The provider
* interprets the supplied path (url) of the data source to connect to and access the
* data.
*
* @param path The path or url of the parameter. Typically this encodes
* parameters used by the data provider as url query items.
* @param baseName The name used to represent the layer in the legend
* @param providerLib The name of the data provider, eg "memory", "postgres"
* @param loadDefaultStyleFlag whether to load the default style
*
*/
QgsVectorLayer( QString path = QString::null, QString baseName = QString::null,
QString providerLib = QString::null, bool loadDefaultStyleFlag = true );
/** Destructor */
virtual ~QgsVectorLayer();
/** Returns the permanent storage type for this layer as a friendly name. */
QString storageType() const;
/** Capabilities for this layer in a friendly format. */
QString capabilitiesString() const;
/** Returns a comment for the data in the layer */
QString dataComment() const;
/** Set the primary display field to be used in the identify results dialog */
void setDisplayField( QString fldName = "" );
/** Returns the primary display field name used in the identify results dialog */
const QString displayField() const;
/** Set the preview expression, used to create a human readable preview string.
* Used e.g. in the attribute table feature list. Uses { @link QgsExpression }.
*
* @param displayExpression The expression which will be used to preview features
* for this layer
*/
void setDisplayExpression( const QString &displayExpression );
/**
* Get the preview expression, used to create a human readable preview string.
* Uses { @link QgsExpression }
*
* @return The expression which will be used to preview features for this layer
*/
const QString displayExpression();
/** Returns the data provider */
QgsVectorDataProvider* dataProvider();
/** Returns the data provider in a const-correct manner
@note not available in python bindings
*/
// const QgsVectorDataProvider* dataProvider() const;
/** Sets the textencoding of the data provider */
void setProviderEncoding( const QString& encoding );
/** Setup the coordinate system transformation for the layer */
void setCoordinateSystem();
/** Joins another vector layer to this layer
@param joinInfo join object containing join layer id, target and source field
@note since 2.6 returns bool indicating whether the join can be added */
bool addJoin( const QgsVectorJoinInfo& joinInfo );
/** Removes a vector layer join */
void removeJoin( const QString& joinLayerId );
const QList< QgsVectorJoinInfo > vectorJoins() const;
/**
* Add a new field which is calculated by the expression specified
*
* @param exp The expression which calculates the field
* @param fld The field to calculate
*
* @return The index of the new field
*
* @note added in 2.6, return value added in 2.9
*/
int addExpressionField( const QString& exp, const QgsField& fld );
/**
* Remove an expression field
*
* @param index The index of the field
*
* @note added in 2.6
*/
void removeExpressionField( int index );
/**
* Returns the expressoin used for a given expression field
*
* @param index An index of an epxression based (virtual) field
*
* @return The expression for the field at index
*
* @note added in 2.9
*/
const QString expressionField( int index );
/**
* Changes the expression used to define an expression based (virtual) field
*
* @param index The index of the expression to change
*
* @param exp The new expression to set
*
* @note added in 2.9
*/
void updateExpressionField( int index, const QString& exp );
/** Get the label object associated with this layer */
QgsLabel *label();
// const QgsLabel *label() const;
QgsAttributeAction *actions();
/**
* The number of features that are selected in this layer
*
* @return See description
*/
int selectedFeatureCount();
/**
* Select features found within the search rectangle (in layer's coordinates)
*
* @param rect The search rectangle
* @param addToSelection If set to true will not clear before selecting
*
* @see invertSelectionInRectangle(QgsRectangle & rect)
*/
void select( QgsRectangle & rect, bool addToSelection );
/**
* Modifies the current selection on this layer
*
* @param selectIds Select these ids
* @param deselectIds Deselect these ids
*
* @see select(QgsFeatureIds)
* @see select(QgsFeatureId)
* @see deselect(QgsFeatureIds)
* @see deselect(QgsFeatureId)
*/
void modifySelection( QgsFeatureIds selectIds, QgsFeatureIds deselectIds );
/** Select not selected features and deselect selected ones */
void invertSelection();
/** Select all the features */
void selectAll();
/** Get all feature Ids */
QgsFeatureIds allFeatureIds();
/**
* Invert selection of features found within the search rectangle (in layer's coordinates)
*
* @param rect The rectangle in which the selection of features will be inverted
*
* @see invertSelection()
*/
void invertSelectionInRectangle( QgsRectangle & rect );
/**
* Get a copy of the user-selected features
*
* @return A list of { @link QgsFeature } 's
*
* @see selectedFeaturesIds()
* @see selectedFeaturesIterator() which is more memory friendly when handling large selections
*/
QgsFeatureList selectedFeatures();
/**
* Get an iterator of the selected features
*
* @param request You may specify a request, e.g. to limit the set of requested attributes.
* Any filter on the request will be discarded.
*
* @return Iterator over the selected features
*
* @see selectedFeaturesIds()
* @see selectedFeatures()
*/
QgsFeatureIterator selectedFeaturesIterator( QgsFeatureRequest request = QgsFeatureRequest() );
/**
* Return reference to identifiers of selected features
*
* @return A list of { @link QgsFeatureId } 's
* @see selectedFeatures()
*/
const QgsFeatureIds &selectedFeaturesIds() const;
/**
* Change selection to the new set of features. Dismisses the current selection.
* Will emit the { @link selectionChanged( QgsFeatureIds, QgsFeatureIds, bool ) } signal with the
* clearAndSelect flag set.
*
* @param ids The ids which will be the new selection
*/
void setSelectedFeatures( const QgsFeatureIds &ids );
/** Returns the bounding box of the selected features. If there is no selection, QgsRectangle(0,0,0,0) is returned */
QgsRectangle boundingBoxOfSelected();
/** Returns whether the layer contains labels which are enabled and should be drawn.
* @return true if layer contains enabled labels
* @note added in QGIS 2.9
*/
bool labelsEnabled() const;
/** Returns whether the layer contains diagrams which are enabled and should be drawn.
* @return true if layer contains enabled diagrams
* @note added in QGIS 2.9
*/
bool diagramsEnabled() const;
/** Sets diagram rendering object (takes ownership) */
void setDiagramRenderer( QgsDiagramRendererV2* r /Transfer/ );
const QgsDiagramRendererV2* diagramRenderer() const;
void setDiagramLayerSettings( const QgsDiagramLayerSettings& s );
const QgsDiagramLayerSettings *diagramLayerSettings() const;
/** Return renderer V2. */
QgsFeatureRendererV2* rendererV2();
/** Set renderer V2. */
void setRendererV2( QgsFeatureRendererV2* r /Transfer/ );
/** Returns point, line or polygon */
QGis::GeometryType geometryType() const;
/** Returns true if this is a geometry layer and false in case of NoGeometry (table only) or UnknownGeometry */
bool hasGeometryType() const;
/**Returns the WKBType or WKBUnknown in case of error*/
QGis::WkbType wkbType() const;
/** Return the provider type for this layer */
QString providerType() const;
/** reads vector layer specific state from project file Dom node.
* @note Called by QgsMapLayer::readXML().
*/
virtual bool readXml( const QDomNode& layer_node );
/** write vector layer specific state to project file Dom node.
* @note Called by QgsMapLayer::writeXML().
*/
virtual bool writeXml( QDomNode & layer_node, QDomDocument & doc );
/**
* Save named and sld style of the layer to the style table in the db.
* @param name
* @param description
* @param useAsDefault
* @param uiFileContent
* @param msgError
*/
virtual void saveStyleToDatabase( QString name, QString description,
bool useAsDefault, QString uiFileContent,
QString &msgError );
/**
* Lists all the style in db split into related to the layer and not related to
* @param ids the list in which will be stored the style db ids
* @param names the list in which will be stored the style names
* @param descriptions the list in which will be stored the style descriptions
* @param msgError
* @return the number of styles related to current layer
*/
virtual int listStylesInDatabase( QStringList &ids, QStringList &names,
QStringList &descriptions, QString &msgError );
/**
* Will return the named style corresponding to style id provided
*/
virtual QString getStyleFromDatabase( QString styleId, QString &msgError );
/**
* Load a named style from file/local db/datasource db
* @param theURI the URI of the style or the URI of the layer
* @param theResultFlag will be set to true if a named style is correctly loaded
* @param loadFromLocalDb if true forces to load from local db instead of datasource one
*/
virtual QString loadNamedStyle( const QString &theURI, bool &theResultFlag, bool loadFromLocalDb );
/**
* Calls loadNamedStyle( theURI, theResultFlag, false );
* Retained for backward compatibility
*/
virtual QString loadNamedStyle( const QString &theURI, bool &theResultFlag );
/**
* Will load a named style from a provided QML string.
*
* @param namedStyle A QML string
* @param errorMsg An error message indicating problems if any
*
* @return true on success
*
* @deprecated Will be removed for QGIS 3 in favor of importNamedStyle
*/
virtual bool applyNamedStyle( QString namedStyle, QString &errorMsg /Out/ );
/** convert a saved attribute editor element into a AttributeEditor structure as it's used internally.
* @param elem the DOM element
* @param parent the QObject which will own this object
*/
QgsAttributeEditorElement* attributeEditorElementFromDomElement( QDomElement &elem, QObject* parent );
/** Read the symbology for the current layer from the Dom node supplied.
* @param node node that will contain the symbology definition for this layer.
* @param errorMessage reference to string that will be updated with any error messages
* @return true in case of success.
*/
bool readSymbology( const QDomNode& node, QString& errorMessage );
/** Write the symbology for the layer into the docment provided.
* @param node the node that will have the style element added to it.
* @param doc the document that will have the QDomNode added.
* @param errorMessage reference to string that will be updated with any error messages
* @return true in case of success.
*/
bool writeSymbology( QDomNode& node, QDomDocument& doc, QString& errorMessage ) const;
bool writeSld( QDomNode& node, QDomDocument& doc, QString& errorMessage ) const;
bool readSld( const QDomNode& node, QString& errorMessage );
/**
* Number of features in the layer. This is necessary if features are
* added/deleted or the layer has been subsetted. If the data provider
* chooses not to support this feature, the total number of features
* can be returned.
* @return long containing number of features
*/
virtual long featureCount() const;
/**
* Update the data source of the layer. The layer's renderer and legend will be preserved only
* if the geometry type of the new data source matches the current geometry type of the layer.
* @param dataSource new layer data source
* @param baseName base name of the layer
* @param provider provider string
* @param loadDefaultStyleFlag set to true to reset the layer's style to the default for the
* data source
* @note added in QGIS 2.10
*/
void setDataSource( QString dataSource, QString baseName, QString provider, bool loadDefaultStyleFlag = false );
/**
* Number of features rendered with specified symbol. Features must be first
* calculated by countSymbolFeatures()
* @param symbol the symbol
* @return number of features rendered by symbol or -1 if failed or counts are not available
*/
long featureCount( QgsSymbolV2* symbol );
/**
* Count features for symbols. Feature counts may be get by featureCount( QgsSymbolV2*).
* @param showProgress show progress dialog
* @return true if calculated, false if failed or was canceled by user
*/
bool countSymbolFeatures( bool showProgress = true );
/**
* Set the string (typically sql) used to define a subset of the layer
* @param subset The subset string. This may be the where clause of a sql statement
* or other defintion string specific to the underlying dataprovider
* and data store.
* @return true, when setting the subset string was successful, false otherwise
*/
virtual bool setSubsetString( QString subset );
/**
* Get the string (typically sql) used to define a subset of the layer
* @return The subset string or QString::null if not implemented by the provider
*/
virtual QString subsetString();
/**
* Query the provider for features specified in request.
*/
QgsFeatureIterator getFeatures( const QgsFeatureRequest& request = QgsFeatureRequest() );
/** Adds a feature
@param f feature to add
@param alsoUpdateExtent If True, will also go to the effort of e.g. updating the extents.
@return True in case of success and False in case of error
*/
bool addFeature( QgsFeature& f, bool alsoUpdateExtent = true );
/** Updates an existing feature. This method needs to query the datasource
on every call. Consider using {@link changeAttributeValue()} or
{@link changeGeometry()} instead.
@param f Feature to update
@return True in case of success and False in case of error
*/
bool updateFeature( QgsFeature &f );
/** Insert a new vertex before the given vertex number,
* in the given ring, item (first number is index 0), and feature
* Not meaningful for Point geometries
*/
bool insertVertex( double x, double y, QgsFeatureId atFeatureId, int beforeVertex );
/** Moves the vertex at the given position number,
* ring and item (first number is index 0), and feature
* to the given coordinates
*/
bool moveVertex( double x, double y, QgsFeatureId atFeatureId, int atVertex );
/** Deletes a vertex from a feature
*/
bool deleteVertex( QgsFeatureId atFeatureId, int atVertex );
/** Deletes the selected features
* @return true in case of success and false otherwise
*/
bool deleteSelectedFeatures( int *deletedCount = 0 );
/**Adds a ring to polygon/multipolygon features
@return
0 in case of success,
1 problem with feature type,
2 ring not closed,
3 ring not valid,
4 ring crosses existing rings,
5 no feature found where ring can be inserted
6 layer not editable */
int addRing( const QList<QgsPoint>& ring );
/**Adds a new part polygon to a multipart feature
@return
0 in case of success,
1 if selected feature is not multipart,
2 if ring is not a valid geometry,
3 if new polygon ring not disjoint with existing rings,
4 if no feature was selected,
5 if several features are selected,
6 if selected geometry not found
7 layer not editable */
int addPart( const QList<QgsPoint>& ring );
/**Translates feature by dx, dy
@param featureId id of the feature to translate
@param dx translation of x-coordinate
@param dy translation of y-coordinate
@return 0 in case of success*/
int translateFeature( QgsFeatureId featureId, double dx, double dy );
/**Splits parts cut by the given line
* @param splitLine line that splits the layer features
* @param topologicalEditing true if topological editing is enabled
* @return
* 0 in case of success,
* 4 if there is a selection but no feature split
*/
int splitParts( const QList<QgsPoint>& splitLine, bool topologicalEditing = false );
/**Splits features cut by the given line
* @param splitLine line that splits the layer features
* @param topologicalEditing true if topological editing is enabled
* @return
* 0 in case of success,
* 4 if there is a selection but no feature split
*/
int splitFeatures( const QList<QgsPoint>& splitLine, bool topologicalEditing = false );
/**Changes the specified geometry such that it has no intersections with other
* polygon (or multipolygon) geometries in this vector layer
* @param geom geometry to modify
* @param ignoreFeatures list of feature ids where intersections should be ignored
* @return 0 in case of success
*
* @deprecated since 2.2 - not being used for "avoid intersections" functionality anymore
*/
int removePolygonIntersections( QgsGeometry* geom, QgsFeatureIds ignoreFeatures = QgsFeatureIds() ) /Deprecated/;
/** Adds topological points for every vertex of the geometry.
* @param geom the geometry where each vertex is added to segments of other features
* @note geom is not going to be modified by the function
* @return 0 in case of success
*/
int addTopologicalPoints( const QgsGeometry* geom );
/** Adds a vertex to segments which intersect point p but don't
* already have a vertex there. If a feature already has a vertex at position p,
* no additional vertex is inserted. This method is useful for topological
* editing.
* @param p position of the vertex
* @return 0 in case of success
*/
int addTopologicalPoints( const QgsPoint& p );
/**Inserts vertices to the snapped segments.
* This is useful for topological editing if snap to segment is enabled.
* @param snapResults results collected from the snapping operation
* @return 0 in case of success
*/
int insertSegmentVerticesForSnap( const QList<QgsSnappingResult>& snapResults );
/** Set labels on
* @deprecated this method is for the old labeling engine
*/
void enableLabels( bool on ) /Deprecated/;
/** Label is on
* @deprecated this method is for the old labeling engine, use labelsEnabled instead
*/
bool hasLabelsEnabled() const /Deprecated/;
/** Returns true if the provider is in editing mode */
virtual bool isEditable() const;
/** Returns true if the provider is in read-only mode */
virtual bool isReadOnly() const;
/** Returns true if the provider has been modified since the last commit */
virtual bool isModified() const;
/**Snaps a point to the closest vertex if there is one within the snapping tolerance
* @param point The point which is set to the position of a vertex if there is one within the snapping tolerance.
* If there is no point within this tolerance, point is left unchanged.
* @param tolerance The snapping tolerance
* @return true if the point has been snapped, false if no vertex within search tolerance
*/
bool snapPoint( QgsPoint& point, double tolerance );
/**Snaps to segment or vertex within given tolerance
* @param startPoint point to snap (in layer coordinates)
* @param snappingTolerance distance tolerance for snapping
* @param snappingResults snapping results. Key is the distance between startPoint and snapping target
* @param snap_to to segment / to vertex
* @return 0 in case of success
*/
int snapWithContext( const QgsPoint& startPoint,
double snappingTolerance,
QMultiMap < double, QgsSnappingResult > &snappingResults /Out/,
QgsSnapper::SnappingType snap_to );
/**Synchronises with changes in the datasource */
virtual void reload();
/** Return new instance of QgsMapLayerRenderer that will be used for rendering of given context
* @note added in 2.4
*/
virtual QgsMapLayerRenderer* createMapRenderer( QgsRenderContext& rendererContext ) /Factory/;
/** Draws the layer
* @return false if an error occurred during drawing
*/
bool draw( QgsRenderContext& rendererContext );
/** Draws the layer labels using the old labeling engine
* @note deprecated
*/
void drawLabels( QgsRenderContext& rendererContext ) /Deprecated/;
/** Return the extent of the layer as a QRect */
QgsRectangle extent();
/** returns field list in the to-be-committed state */
const QgsFields &pendingFields() const;
/** returns list of attributes */
QList<int> pendingAllAttributesList();
/** returns list of attribute making up the primary key */
QList<int> pendingPkAttributesList();
/** returns feature count after commit */
int pendingFeatureCount();
/** Make layer read-only (editing disabled) or not
* @return false if the layer is in editing yet
*/
bool setReadOnly( bool readonly = true );
/** Make layer editable */
bool startEditing();
/** change feature's geometry */
bool changeGeometry( QgsFeatureId fid, QgsGeometry* geom );
/**
* Changes an attribute value (but does not commit it)
*
* @deprecated The emitSignal parameter is obsolete and not considered at the moment. It will
* be removed in future releases. Remove it to be prepared for the future. (Since 2.1)
*/
bool changeAttributeValue( QgsFeatureId fid, int field, QVariant value, bool emitSignal ) /Deprecated/;
/**
* Changes an attribute value (but does not commit it)
*
* @param fid The feature id of the feature to be changed
* @param field The index of the field to be updated
* @param newValue The value which will be assigned to the field
* @param oldValue The previous value to restore on undo (will otherwise be retrieved)
*
* @return true in case of success
*/
bool changeAttributeValue( QgsFeatureId fid, int field, const QVariant &newValue, const QVariant &oldValue = QVariant() );
/** add an attribute field (but does not commit it)
returns true if the field was added */
bool addAttribute( const QgsField &field );
/** Sets an alias (a display name) for attributes to display in dialogs */
void addAttributeAlias( int attIndex, QString aliasString );
/** Removes an alias (a display name) for attributes to display in dialogs */
void remAttributeAlias( int attIndex );
/**
* Adds a tab (for the attribute editor form) holding groups and fields
*/
void addAttributeEditorWidget( QgsAttributeEditorElement* data );
/**
* Get the id for the editor widget used to represent the field at the given index
*
* @param fieldIdx The index of the field
*
* @return The id for the editor widget or a NULL string if not applicable
*/
const QString editorWidgetV2( int fieldIdx ) const;
/**
* Get the id for the editor widget used to represent the field at the given index
*
* @param fieldName The name of the field
*
* @return The id for the editor widget or a NULL string if not applicable
*
* @note python method name editorWidgetV2ByName
*/
const QString editorWidgetV2( const QString& fieldName ) const /PyName=editorWidgetV2ByName/;
/**
* Get the configuration for the editor widget used to represent the field at the given index
*
* @param fieldIdx The index of the field
*
* @return The configuration for the editor widget or an empty config if the field does not exist
*/
const QgsEditorWidgetConfig editorWidgetV2Config( int fieldIdx ) const;
/**
* Get the configuration for the editor widget used to represent the field at the given index
*
* @param fieldName The name of the field
*
* @return The configuration for the editor widget or an empty config if the field does not exist
*
* @note python method name is editorWidgetV2ConfigByName
*/
const QgsEditorWidgetConfig editorWidgetV2Config( const QString& fieldName ) const /PyName=editorWidgetV2ConfigByName/;
/**
* Returns a list of tabs holding groups and fields
*/
QList< QgsAttributeEditorElement* > &attributeEditorElements();
/**
* Clears all the tabs for the attribute editor form
*/
void clearAttributeEditorWidgets();
/** Returns the alias of an attribute name or an empty string if there is no alias */
QString attributeAlias( int attributeIndex ) const;
/** Convenience function that returns the attribute alias if defined or the field name else */
QString attributeDisplayName( int attributeIndex ) const;
const QMap< QString, QString >& attributeAliases() const;
const QSet<QString>& excludeAttributesWMS() const;
void setExcludeAttributesWMS( const QSet<QString>& att );
const QSet<QString>& excludeAttributesWFS() const;
void setExcludeAttributesWFS( const QSet<QString>& att );
/** delete an attribute field (but does not commit it) */
bool deleteAttribute( int attr );
/**
* Deletes a list of attribute fields (but does not commit it)
*
* @param attrs the indices of the attributes to delete
* @return true if at least one attribute has been deleted
*
*/
bool deleteAttributes( QList<int> attrs );
/** Insert a copy of the given features into the layer (but does not commit it) */
bool addFeatures( QList<QgsFeature> features, bool makeSelected = true );
/** delete a feature from the layer (but does not commit it) */
bool deleteFeature( QgsFeatureId fid );
/**
Attempts to commit any changes to disk. Returns the result of the attempt.
If a commit fails, the in-memory changes are left alone.
This allows editing to continue if the commit failed on e.g. a
disallowed value in a Postgres database - the user can re-edit and try
again.
The commits occur in distinct stages,
(add attributes, add features, change attribute values, change
geometries, delete features, delete attributes)
so if a stage fails, it's difficult to roll back cleanly.
Therefore any error message also includes which stage failed so
that the user has some chance of repairing the damage cleanly.
*/
bool commitChanges();
const QStringList &commitErrors();
/** Stop editing and discard the edits
* @param deleteBuffer whether to delete editing buffer
*/
bool rollBack( bool deleteBuffer = true );
/**
* Get edit type
*
* @deprecated Use editorWidgetV2() instead
*/
EditType editType( int idx ) /Deprecated/;
/**
* Get edit type
*
* @deprecated Use setEditorWidgetV2() instead
*/
void setEditType( int idx, EditType edit ) /Deprecated/;
/** get the active layout for the attribute editor for this layer */
EditorLayout editorLayout();
/** set the active layout for the attribute editor for this layer */
void setEditorLayout( EditorLayout editorLayout );
/**
* Set the editor widget type for a field
*
* QGIS ships the following widget types, additional types may be available depending
* on plugins.
*
* <ul>
* <li>CheckBox (QgsCheckboxWidgetWrapper)</li>
* <li>Classification (QgsClassificationWidgetWrapper)</li>
* <li>Color (QgsColorWidgetWrapper)</li>
* <li>DateTime (QgsDateTimeEditWrapper)</li>
* <li>Enumeration (QgsEnumerationWidgetWrapper)</li>
* <li>FileName (QgsFileNameWidgetWrapper)</li>
* <li>Hidden (QgsHiddenWidgetWrapper)</li>
* <li>Photo (QgsPhotoWidgetWrapper)</li>
* <li>Range (QgsRangeWidgetWrapper)</li>
* <li>RelationReference (QgsRelationReferenceWidgetWrapper)</li>
* <li>TextEdit (QgsTextEditWrapper)</li>
* <li>UniqueValues (QgsUniqueValuesWidgetWrapper)</li>
* <li>UuidGenerator (QgsUuidWidgetWrapper)</li>
* <li>ValueMap (QgsValueMapWidgetWrapper)</li>
* <li>ValueRelation (QgsValueRelationWidgetWrapper)</li>
* <li>WebView (QgsWebViewWidgetWrapper)</li>
* </ul>
*
* @param attrIdx Index of the field
* @param widgetType Type id of the editor widget to use
*/
void setEditorWidgetV2( int attrIdx, const QString& widgetType );
/**
* Set the editor widget config for a field.
*
* Python: Will accept a map.
*
* Example:
* \code{.py}
* layer.setEditorWidgetV2Config( 1, { 'Layer': 'otherlayerid_1234', 'Key': 'Keyfield', 'Value': 'ValueField' } )
* \endcode
*
* @param attrIdx Index of the field
* @param config The config to set for this field
*
* @see setEditorWidgetV2() for a list of widgets and choose the widget to see the available options.
*/
void setEditorWidgetV2Config( int attrIdx, const QMap<QString, QVariant>& config );
/**
* Set string representing 'true' for a checkbox
*
* @deprecated Use setEditorWidgetV2Config() instead
*/
void setCheckedState( int idx, QString checked, QString notChecked ) /Deprecated/;
/** get edit form */
QString editForm();
/** set edit form */
void setEditForm( QString ui );
/** Type of feature form pop-up suppression after feature creation (overrides app setting)
* @note added in 2.1 */
QgsVectorLayer::FeatureFormSuppress featureFormSuppress() const;
/** Set type of feature form pop-up suppression after feature creation (overrides app setting)
* @note added in 2.1 */
void setFeatureFormSuppress( QgsVectorLayer::FeatureFormSuppress s );
/** get annotation form */
QString annotationForm() const;
/** set annotation form for layer */
void setAnnotationForm( const QString& ui );
/** get python function for edit form initialization */
QString editFormInit();
/** set python function for edit form initialization */
void setEditFormInit( QString function );
/**
* Access value map
* @deprecated Use editorWidgetV2Config() instead
*/
QMap<QString, QVariant> valueMap( int idx ) /Deprecated/;
/**
* Access range widget config data
*
* @deprecated Use editorWidgetV2Config() instead
*/
RangeData range( int idx ) /Deprecated/;
/** Access value relation widget data */
ValueRelationData valueRelation( int idx );
/**
* Get relations, where the foreign key is on this layer
*
* @param idx Only get relations, where idx forms part of the foreign key
* @return A list of relations
*/
QList<QgsRelation> referencingRelations( int idx );
/**
* Access date format
*
* @deprecated Use setEditorWidgetV2Config() instead
*/
QString dateFormat( int idx ) /Deprecated/;
/**
* Access widget size for photo and webview widget
*
* @deprecated Use setEditorWidgetV2Config() instead
*/
QSize widgetSize( int idx ) /Deprecated/;
/**is edit widget editable **/
bool fieldEditable( int idx );
/**label widget on top **/
bool labelOnTop( int idx );
/**set edit widget editable **/
void setFieldEditable( int idx, bool editable );
/**label widget on top **/
void setLabelOnTop( int idx, bool onTop );
//! Buffer with uncommitted editing operations. Only valid after editing has been turned on.
QgsVectorLayerEditBuffer* editBuffer();
/**
* Create edit command for undo/redo operations
* @param text text which is to be displayed in undo window
*/
void beginEditCommand( QString text );
/** Finish edit command and add it to undo/redo stack */
void endEditCommand();
/** Destroy active command and reverts all changes in it */
void destroyEditCommand();
/** Returns the index of a field name or -1 if the field does not exist */
int fieldNameIndex( const QString& fieldName ) const;
/** Editing vertex markers */
enum VertexMarkerType
{
SemiTransparentCircle,
Cross,
NoMarker
};
/** Draws a vertex symbol at (screen) coordinates x, y. (Useful to assist vertex editing.) */
static void drawVertexMarker( double x, double y, QPainter& p, QgsVectorLayer::VertexMarkerType type, int vertexSize );
/** Assembles mUpdatedFields considering provider fields, joined fields and added fields */
void updateFields();
/** Caches joined attributes if required (and not already done) */
void createJoinCaches();
/**Returns unique values for column
@param index column index for attribute
@param uniqueValues out: result list
@param limit maximum number of values to return (-1 if unlimited) */
void uniqueValues( int index, QList<QVariant> &uniqueValues /Out/, int limit = -1 );
/**Returns minimum value for an attribute column or invalid variant in case of error */
QVariant minimumValue( int index );
/**Returns maximum value for an attribute column or invalid variant in case of error */
QVariant maximumValue( int index );
/** Fetches all values from a specified field name or expression.
* @param fieldOrExpression field name or an expression string
* @param ok will be set to false if field or expression is invalid, otherwise true
* @param selectedOnly set to true to get values from selected features only
* @returns list of fetched values
* @note added in QGIS 2.9
* @see getDoubleValues
*/
QList< QVariant > getValues( const QString &fieldOrExpression, bool &ok, bool selectedOnly = false );
/** Fetches all double values from a specified field name or expression. Null values or
* invalid expression results are skipped.
* @param fieldOrExpression field name or an expression string evaluating to a double value
* @param ok will be set to false if field or expression is invalid, otherwise true
* @param selectedOnly set to true to get values from selected features only
* @param nullCount optional pointer to integer to store number of null values encountered in
* @returns list of fetched values
* @note added in QGIS 2.9
* @see getValues
*/
QList< double > getDoubleValues( const QString &fieldOrExpression, bool &ok, bool selectedOnly = false, int* nullCount = 0 );
/** Set the blending mode used for rendering each feature */
void setFeatureBlendMode( const QPainter::CompositionMode &blendMode );
/** Returns the current blending mode for features */
QPainter::CompositionMode featureBlendMode() const;
/** Set the transparency for the vector layer */
void setLayerTransparency( int layerTransparency );
/** Returns the current transparency for the vector layer */
int layerTransparency() const;
QString metadata();
/** @note not available in python bindings */
// inline QgsGeometryCache* cache();
/** Set the simplification settings for fast rendering of features
* @note added in 2.2
*/
void setSimplifyMethod( const QgsVectorSimplifyMethod& simplifyMethod );
/** Returns the simplification settings for fast rendering of features
* @note added in 2.2
*/
const QgsVectorSimplifyMethod& simplifyMethod() const;
/** Returns whether the VectorLayer can apply the specified simplification hint
* @note Do not use in 3rd party code - may be removed in future version!
* @note added in 2.2
*/
bool simplifyDrawingCanbeApplied( const QgsRenderContext& renderContext, QgsVectorSimplifyMethod::SimplifyHint simplifyHint ) const;
public slots:
/**
* Select feature by its ID
*
* @param featureId The id of the feature to select
*
* @see select(QgsFeatureIds)
*/
void select( const QgsFeatureId &featureId );
/**
* Select features by their ID
*
* @param featureIds The ids of the features to select
*
* @see select(QgsFeatureId)
*/
void select( const QgsFeatureIds& featureIds );
/**
* Deselect feature by its ID
*
* @param featureId The id of the feature to deselect
*
* @see deselect(QgsFeatureIds)
*/
void deselect( const QgsFeatureId featureId );
/**
* Deselect features by their ID
*
* @param featureIds The ids of the features to deselect
*
* @see deselect(QgsFeatureId)
*/
void deselect( const QgsFeatureIds& featureIds );
/**
* Clear selection
*
* @see setSelectedFeatures(const QgsFeatureIds&)
*/
void removeSelection();
/** Update the extents for the layer. This is necessary if features are
* added/deleted or the layer has been subsetted.
*/
virtual void updateExtents();
/** Check if there is a join with a layer that will be removed */
void checkJoinLayerRemove( QString theLayerId );
protected slots:
void invalidateSymbolCountedFlag();
signals:
/**
* This signal is emitted when selection was changed
*
* @param selected Newly selected feature ids
* @param deselected Ids of all features which have previously been selected but are not any more
* @param clearAndSelect In case this is set to true, the old selection was dismissed and the new selection corresponds to selected
*/
void selectionChanged( const QgsFeatureIds selected, const QgsFeatureIds deselected, const bool clearAndSelect );
/** This signal is emitted when selection was changed */
void selectionChanged();
/** This signal is emitted when modifications has been done on layer */
void layerModified();
/** Is emitted, when layer is checked for modifications. Use for last-minute additions */
void beforeModifiedCheck() const;
/** Is emitted, when editing on this layer has started*/
void editingStarted();
/** Is emitted, when edited changes successfully have been written to the data provider */
void editingStopped();
/** Is emitted, before changes are commited to the data provider */
void beforeCommitChanges();
/** Is emitted, before changes are rolled back*/
void beforeRollBack();
/**
* Will be emitted, when a new attribute has been added to this vector layer.
* Applies only to types {@link QgsFields::OriginEdit} and {@link QgsFields::OriginProvider}
*
* @param idx The index of the new attribute
*
* @see updatedFields()
*/
void attributeAdded( int idx );
/**
* Will be emitted, when an attribute has been deleted from this vector layer.
* Applies only to types {@link QgsFields::OriginEdit} and {@link QgsFields::OriginProvider}
*
* @param idx The index of the deleted attribute
*
* @see updatedFields()
*/
void attributeDeleted( int idx );
void featureAdded( QgsFeatureId fid );
void featureDeleted( QgsFeatureId fid );
/**
* Emitted when features have been deleted.
*
* If features are deleted within an edit command, this will only be emitted once at the end
* to allow connected slots to minimize the overhead.
* If features are delted outside of an edit command, this signal will be emitted once per feature.
*
* @param fids The feature ids that have been deleted.
*/
void featuresDeleted( QgsFeatureIds fids );
/**
* Is emitted, whenever the fields available from this layer have been changed.
* This can be due to manually adding attributes or due to a join.
*/
void updatedFields();
void layerDeleted();
void attributeValueChanged( QgsFeatureId fid, int idx, const QVariant & );
void geometryChanged( QgsFeatureId fid, QgsGeometry &geom );
/** Signals emitted after committing changes */
void committedAttributesDeleted( const QString& layerId, const QgsAttributeList& deletedAttributes );
void committedAttributesAdded( const QString& layerId, const QList<QgsField>& addedAttributes );
void committedFeaturesAdded( const QString& layerId, const QgsFeatureList& addedFeatures );
void committedFeaturesRemoved( const QString& layerId, const QgsFeatureIds& deletedFeatureIds );
void committedAttributeValuesChanges( const QString& layerId, const QgsChangedAttributesMap& changedAttributesValues );
void committedGeometriesChanges( const QString& layerId, const QgsGeometryMap& changedGeometries );
void saveLayerToProject();
/** Emitted when the font family defined for labeling layer is not found on system */
void labelingFontNotFound( QgsVectorLayer* layer, const QString& fontfamily );
/** Signal emitted when setFeatureBlendMode() is called */
void featureBlendModeChanged( const QPainter::CompositionMode &blendMode );
/** Signal emitted when setLayerTransparency() is called */
void layerTransparencyChanged( int layerTransparency );
/**
* Signal emitted when a new edit command has been started
*
* @param text Description for this edit command
*/
void editCommandStarted( const QString& text );
/**
* Signal emitted, when an edit command successfully ended
* @note This does not mean it is also committed, only that it is written
* to the edit buffer. See {@link beforeCommitChanges()}
*/
void editCommandEnded();
/**
* Signal emitted, whan an edit command is destroyed
* @note This is not a rollback, it is only related to the current edit command.
* See {@link beforeRollBack()}
*/
void editCommandDestroyed();
/**
* Signal emitted whenever the symbology (QML-file) for this layer is being read.
* If there is custom style information saved in the file, you can connect to this signal
* and update the layer style accordingly.
*
* @param element The XML layer style element.
*
* @param errorMessage Write error messages into this string.
*/
void readCustomSymbology( const QDomElement& element, QString& errorMessage );
/**
* Signal emitted whenever the symbology (QML-file) for this layer is being written.
* If there is custom style information you want to save to the file, you can connect
* to this signal and update the element accordingly.
*
* @param element The XML element where you can add additional style information to.
* @param doc The XML document that you can use to create new XML nodes.
* @param errorMessage Write error messages into this string.
*/
void writeCustomSymbology( QDomElement& element, QDomDocument& doc, QString& errorMessage ) const;
private slots:
void onRelationsLoaded();
void onJoinedFieldsChanged();
protected:
/** Set the extent */
void setExtent( const QgsRectangle &rect );
private: // Private methods
/** vector layers are not copyable */
QgsVectorLayer( const QgsVectorLayer & rhs );
};
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