Class: QgsMapToolIdentify

class qgis.gui.QgsMapToolIdentify(canvas: QgsMapCanvas)

Bases: QgsMapTool

constructor

Map tool for identifying features in layers

after selecting a point, performs the identification: - for raster layers shows value of underlying pixel - for vector layers shows feature attributes within search radius (allows editing values when vector layer is in editing mode)

Parameters

canvas

ActiveLayer = 0
AllLayers = 7
DefaultQgsSetting = -1
class IdentifyMode

Bases: int

baseClass

alias of QgsMapToolIdentify

class IdentifyResult

Bases: sip.wrapper

Constructor for IdentifyResult

QgsMapToolIdentify.IdentifyResult(layer: QgsMapLayer, feature: QgsFeature, derivedAttributes: Dict[str, str])

QgsMapToolIdentify.IdentifyResult(layer: QgsMapLayer, label: str, attributes: Dict[str, str], derivedAttributes: Dict[str, str])

QgsMapToolIdentify.IdentifyResult(layer: QgsMapLayer, label: str, fields: QgsFields, feature: QgsFeature, derivedAttributes: Dict[str, str])

QgsMapToolIdentify.IdentifyResult(QgsMapToolIdentify.IdentifyResult)

mAttributes
mDerivedAttributes
mFeature
mFields
mLabel
mLayer
mParams
LayerSelection = 3
class LayerType

Bases: sip.wrapper

QgsMapToolIdentify.LayerType(Union[QgsMapToolIdentify.LayerType, QgsMapToolIdentify.Type]) QgsMapToolIdentify.LayerType(QgsMapToolIdentify.LayerType)

baseClass

alias of QgsMapToolIdentify

MeshLayer = 4
RasterLayer = 2
TopDownAll = 2
TopDownStopAtFirst = 1
class Type

Bases: int

VectorLayer = 1
activate(self)
canvasMoveEvent(self, e: QgsMapMouseEvent)
Parameters

e (QgsMapMouseEvent) –

canvasPressEvent(self, e: QgsMapMouseEvent)
Parameters

e (QgsMapMouseEvent) –

canvasReleaseEvent(self, e: QgsMapMouseEvent)
Parameters

e (QgsMapMouseEvent) –

changedRasterResults

changedRasterResults(self, Iterable[QgsMapToolIdentify.IdentifyResult]) [signal]

childEvent()
connectNotify()
customEvent()
deactivate(self)
derivedAttributesForPoint(self, point: QgsPoint) → Dict[str, str]

Returns derived attributes map for a clicked point in map coordinates. May be 2D or 3D point.

Parameters

point (QgsPoint) –

Return type

Dict[str, str]

disconnectNotify()
flags(self) → QgsMapTool.Flags
Return type

QgsMapTool.Flags

formatChanged(self, layer: QgsRasterLayer)
Parameters

layer (QgsRasterLayer) –

identify(self, x: int, y: int, layerList: Iterable[QgsMapLayer] = [], mode: QgsMapToolIdentify.IdentifyMode = QgsMapToolIdentify.DefaultQgsSetting) → List[QgsMapToolIdentify.IdentifyResult]

Performs the identification.

Parameters
  • x (int) – x coordinates of mouseEvent

  • y (int) – y coordinates of mouseEvent

  • layerList (Iterable[QgsMapLayer] = []) – Performs the identification within the given list of layers. Default value is an empty list, i.e. uses all the layers.

  • mode (QgsMapToolIdentify.IdentifyMode = QgsMapToolIdentify.DefaultQgsSetting) – Identification mode. Can use Qgis default settings or a defined mode. Default mode is DefaultQgsSetting.

Returns

a list of IdentifyResult*

identify(self, x: int, y: int, mode: QgsMapToolIdentify.IdentifyMode, layerType: Union[QgsMapToolIdentify.LayerType, QgsMapToolIdentify.Type] = QgsMapToolIdentify.AllLayers) -> List[QgsMapToolIdentify.IdentifyResult] Performs the identification. To avoid being forced to specify IdentifyMode with a list of layers this has been made private and two publics methods are offered

Parameters
  • x – x coordinates of mouseEvent

  • y – y coordinates of mouseEvent

  • mode – Identification mode. Can use Qgis default settings or a defined mode.

  • layerType – Only performs identification in a certain type of layers (raster, vector, mesh). Default value is AllLayers.

Returns

a list of IdentifyResult

identify(self, geometry: QgsGeometry, mode: QgsMapToolIdentify.IdentifyMode, layerType: Union[QgsMapToolIdentify.LayerType, QgsMapToolIdentify.Type]) -> List[QgsMapToolIdentify.IdentifyResult] Performs identification based on a geometry (in map coordinates)

identify(self, geometry: QgsGeometry, mode: QgsMapToolIdentify.IdentifyMode, layerList: Iterable[QgsMapLayer], layerType: Union[QgsMapToolIdentify.LayerType, QgsMapToolIdentify.Type]) -> List[QgsMapToolIdentify.IdentifyResult] Performs identification based on a geometry (in map coordinates)

identify(self, x: int, y: int, mode: QgsMapToolIdentify.IdentifyMode, layerList: Iterable[QgsMapLayer], layerType: Union[QgsMapToolIdentify.LayerType, QgsMapToolIdentify.Type] = QgsMapToolIdentify.AllLayers) -> List[QgsMapToolIdentify.IdentifyResult] Performs the identification. To avoid being forced to specify IdentifyMode with a list of layers this has been made private and two publics methods are offered

Parameters
  • x – x coordinates of mouseEvent

  • y – y coordinates of mouseEvent

  • mode – Identification mode. Can use Qgis default settings or a defined mode.

  • layerList – Performs the identification within the given list of layers.

  • layerType – Only performs identification in a certain type of layers (raster, vector, mesh).

Return type

List[QgsMapToolIdentify.IdentifyResult]

Returns

a list of IdentifyResult

identifyLayer(self, results: Iterable[QgsMapToolIdentify.IdentifyResult], layer: QgsMapLayer, point: QgsPointXY, viewExtent: QgsRectangle, mapUnitsPerPixel: float, layerType: Union[QgsMapToolIdentify.LayerType, QgsMapToolIdentify.Type] = QgsMapToolIdentify.AllLayers) → bool

Call the right method depending on layer type

Parameters
Return type

bool

identifyMenu(self) → QgsIdentifyMenu

Returns a pointer to the identify menu which will be used in layer selection mode this menu can also be customized

Return type

QgsIdentifyMenu

identifyMeshLayer(self, results: Iterable[QgsMapToolIdentify.IdentifyResult], layer: QgsMeshLayer, point: QgsPointXY) → bool

Identifies data from active scalar and vector dataset from the mesh layer

Works only if layer was already rendered (triangular mesh is created)

New in version 3.6.

Parameters
Return type

bool

identifyMessage

identifyMessage(self, str) [signal]

identifyProgress

identifyProgress(self, int, int) [signal]

identifyRasterLayer(self, results: Iterable[QgsMapToolIdentify.IdentifyResult], layer: QgsRasterLayer, point: QgsPointXY, viewExtent: QgsRectangle, mapUnitsPerPixel: float) → bool
Parameters
Return type

bool

identifyVectorLayer(self, results: Iterable[QgsMapToolIdentify.IdentifyResult], layer: QgsVectorLayer, point: QgsPointXY) → bool
Parameters
Return type

bool

isSignalConnected()
receivers()
restoreCanvasPropertiesOverrides(self)

Clears canvas properties overrides previously set with setCanvasPropertiesOverrides()

New in version 3.4.

sender()
senderSignalIndex()
setCanvasPropertiesOverrides(self, searchRadiusMapUnits: float)

Overrides some map canvas properties inside the map tool for the upcoming identify requests.

This is useful when the identification is triggered by some other piece of GUI like a 3D map view and some properties like search radius need to be adjusted so that identification returns correct results. Currently only search radius may be overridden.

When the custom identification has finished, restoreCanvasPropertiesOverrides() should be called to erase any overrides.

New in version 3.4.

Parameters

searchRadiusMapUnits (float) –

timerEvent()
toCanvasCoordinates()
toLayerCoordinates()
toMapCoordinates()
toMapCoordinatesV2()