Class: QgsVectorLayerTools

class qgis.core.QgsVectorLayerTools

Bases: PyQt5.QtCore.QObject

Methods in this class are used to handle basic operations on vector layers. With an implementation of this class, parts of the application can ask for an operation to be done and the implementation will then take care of it.

Reimplement this class, if you need to have custom checks or GUI elements in your application.

Enums

Methods

addFeature This method should/will be called, whenever a new feature will be added to the layer
childEvent
connectNotify
copyMoveFeatures Copy and move features with defined translation.
customEvent
disconnectNotify
isSignalConnected
receivers
saveEdits Should be called, when the features should be committed but the editing session is not ended.
sender
senderSignalIndex
startEditing This will be called, whenever a vector layer should be switched to edit mode.
stopEditing Will be called, when an editing session is ended and the features should be committed.
timerEvent

Signals

Attributes

addFeature(self, layer: QgsVectorLayer, defaultValues: Dict[int, Any] = {}, defaultGeometry: QgsGeometry = QgsGeometry()) → Tuple[bool, QgsFeature]

This method should/will be called, whenever a new feature will be added to the layer

Parameters:
  • layer – The layer to which the feature should be added
  • defaultValues – Default values for the feature to add
  • defaultGeometry – A default geometry to add to the feature
Returns:

  • True in case of success, False if the operation failed/was aborted
  • feature: Updated feature after adding will be written back to this

childEvent()
connectNotify()
copyMoveFeatures(self, layer: QgsVectorLayer, request: QgsFeatureRequest, dx: float = 0, dy: float = 0) → Tuple[bool, QgsFeatureRequest, str]

Copy and move features with defined translation.

Parameters:
  • layer – The layer
  • request – The request for the features to be moved. It will be assigned to a new feature request with the newly copied features.
  • dx – The translation on x
  • dy – The translation on y
Returns:

  • True if all features could be copied.
  • errorMsg: If given, it will contain the error message

customEvent()
disconnectNotify()
isSignalConnected()
receivers()
saveEdits(self, layer: QgsVectorLayer) → bool

Should be called, when the features should be committed but the editing session is not ended.

Parameters:layer – The layer to commit
Returns:True if successful
sender()
senderSignalIndex()
startEditing(self, layer: QgsVectorLayer) → bool

This will be called, whenever a vector layer should be switched to edit mode. Check the providers capability to edit in here. If successful layer->startEditing() will be called and True returned.

Parameters:layer – The layer on which to start an edit session
Returns:True, if the editing session was started
stopEditing(self, layer: QgsVectorLayer, allowCancel: bool = True) → bool

Will be called, when an editing session is ended and the features should be committed. Appropriate dialogs should be shown like

Parameters:
  • layer – The layer to commit
  • allowCancelTrue if a cancel button should be offered
Returns:

True if successful

timerEvent()