QgsMapToolIdentifyFeature Class Reference

A map tool to identify a feature on a chosen layer. More...

#include <qgsmaptoolidentifyfeature.h>

Inheritance diagram for QgsMapToolIdentifyFeature:

Signals
void	featureIdentified (const QgsFeature &feature)
	Emitted when a feature has been identified.
Q_DECL_DEPRECATED void	featureIdentified (QgsFeatureId id)
	Emitted when a feature has been identified by its id.
Signals inherited from QgsMapToolIdentify
void	changedRasterResults (QList< QgsMapToolIdentify::IdentifyResult > &results)
	Emitted when the format of raster results is changed and need to be updated in user-facing displays.
void	identifyMessage (const QString &message)
	Emitted when the identify operation needs to show a user-facing message.
void	identifyProgress (int processed, int total)
	Emitted when the identify action progresses.
Signals inherited from QgsMapTool
void	activated ()
	Emitted when the map tool is activated.
void	deactivated ()
	Emitted when the map tool is deactivated.
void	messageDiscarded ()
	Emitted when the previous message from the tool should be cleared from the application message bar.
void	messageEmitted (const QString &message, Qgis::MessageLevel level=Qgis::MessageLevel::Info)
	Emitted when a message should be shown to the user in the application message bar.
void	reactivated ()
	Emitted when the map tool is activated, while it is already active.

Public Member Functions
	QgsMapToolIdentifyFeature (QgsMapCanvas *canvas, QgsVectorLayer *vl=nullptr)
	QgsMapToolIdentifyFeature is a map tool to identify a feature on a chosen layer.
void	canvasReleaseEvent (QgsMapMouseEvent *e) override
	Mouse release event for overriding. Default implementation does nothing.
void	setLayer (QgsVectorLayer *vl)
	change the layer used by the map tool to identify
Public Member Functions inherited from QgsMapToolIdentify
	QgsMapToolIdentify (QgsMapCanvas *canvas)
	constructor
	~QgsMapToolIdentify () override
void	activate () override
	called when set as currently active map tool
void	canvasMoveEvent (QgsMapMouseEvent *e) override
	Mouse move event for overriding. Default implementation does nothing.
void	canvasPressEvent (QgsMapMouseEvent *e) override
	Mouse press event for overriding. Default implementation does nothing.
void	deactivate () override
	called when map tool is being deactivated
Flags	flags () const override
	Returns the flags for the map tool.
void	fromElevationProfileLayerIdentificationToIdentifyResults (QgsMapLayer *layer, const QVector< QVariantMap > &identified, QList< QgsMapToolIdentify::IdentifyResult > &results)
	Converts elevation profile identification results from variant maps to QgsMapToolIdentify::IdentifyResult and apply some formatting.
QList< QgsMapToolIdentify::IdentifyResult >	identify (const QgsGeometry &geometry, IdentifyMode mode, const QList< QgsMapLayer * > &layerList, LayerType layerType, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs identification based on a geometry (in map coordinates)
QList< QgsMapToolIdentify::IdentifyResult >	identify (const QgsGeometry &geometry, IdentifyMode mode, LayerType layerType, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs identification based on a geometry (in map coordinates)
QList< QgsMapToolIdentify::IdentifyResult >	identify (int x, int y, const QList< QgsMapLayer * > &layerList=QList< QgsMapLayer * >(), IdentifyMode mode=DefaultQgsSetting, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs the identification.
QList< QgsMapToolIdentify::IdentifyResult >	identify (int x, int y, IdentifyMode mode, LayerType layerType=AllLayers, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs the identification.
QgsIdentifyMenu *	identifyMenu ()
	Returns a pointer to the identify menu which will be used in layer selection mode this menu can also be customized.
Public Member Functions inherited from QgsMapTool
	~QgsMapTool () override
QAction *	action ()
	Returns associated action with map tool or nullptr if no action is associated.
QAbstractButton *	button ()
	Returns associated button with map tool or nullptr if no button is associated.
QgsMapCanvas *	canvas () const
	returns pointer to the tool's map canvas
virtual void	canvasDoubleClickEvent (QgsMapMouseEvent *e)
	Mouse double-click event for overriding. Default implementation does nothing.
virtual bool	canvasToolTipEvent (QHelpEvent *e)
	Tooltip event for overriding.
virtual void	clean ()
	convenient method to clean members
virtual bool	gestureEvent (QGestureEvent *e)
	gesture event for overriding. Default implementation does nothing.
bool	isActive () const
	Returns if the current map tool active on the map canvas.
virtual void	keyReleaseEvent (QKeyEvent *e)
	Key event for overriding. Default implementation does nothing.
virtual void	populateContextMenu (QMenu *menu)
	Allows the tool to populate and customize the given menu, prior to showing it in response to a right-mouse button click.
virtual bool	populateContextMenuWithEvent (QMenu *menu, QgsMapMouseEvent *event)
	Allows the tool to populate and customize the given menu, prior to showing it in response to a right-mouse button click.
virtual void	reactivate ()
	Called when the map tool is being activated while it is already active.
void	setAction (QAction *action)
	Use this to associate a QAction to this maptool.
void	setButton (QAbstractButton *button)
	Use this to associate a button to this maptool.
virtual void	setCursor (const QCursor &cursor)
	Sets a user defined cursor.
QgsPointXY	toMapCoordinates (QPoint point)
	Transforms a point from screen coordinates to map coordinates.
QString	toolName ()
	Emit map tool changed with the old tool.
virtual void	wheelEvent (QWheelEvent *e)
	Mouse wheel event for overriding. Default implementation does nothing.

Protected Member Functions
void	keyPressEvent (QKeyEvent *e) override
	Key event for overriding. Default implementation does nothing.
Protected Member Functions inherited from QgsMapToolIdentify
QMap< QString, QString >	derivedAttributesForPoint (const QgsPoint &point)
	Returns derived attributes map for a clicked point in map coordinates. May be 2D or 3D point.
QList< QgsMapToolIdentify::IdentifyResult >	identify (int x, int y, IdentifyMode mode, const QList< QgsMapLayer * > &layerList, LayerType layerType=AllLayers, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs the identification.
bool	identifyLayer (QList< QgsMapToolIdentify::IdentifyResult > *results, QgsMapLayer *layer, const QgsPointXY &point, const QgsRectangle &viewExtent, double mapUnitsPerPixel, QgsMapToolIdentify::LayerType layerType=AllLayers, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Call the right method depending on layer type.
bool	identifyMeshLayer (QList< QgsMapToolIdentify::IdentifyResult > *results, QgsMeshLayer *layer, const QgsPointXY &point, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Identifies data from active scalar and vector dataset from the mesh layer.
bool	identifyRasterLayer (QList< QgsMapToolIdentify::IdentifyResult > *results, QgsRasterLayer *layer, QgsPointXY point, const QgsRectangle &viewExtent, double mapUnitsPerPixel, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs the identification against a given raster layer.
bool	identifyVectorLayer (QList< QgsMapToolIdentify::IdentifyResult > *results, QgsVectorLayer *layer, const QgsPointXY &point, const QgsIdentifyContext &identifyContext=QgsIdentifyContext())
	Performs the identification against a given vector layer.
Q_DECL_DEPRECATED void	restoreCanvasPropertiesOverrides ()
	Clears canvas properties overrides previously set with setCanvasPropertiesOverrides()
void	restorePropertiesOverrides ()
	Clears canvas properties overrides previously set with setPropertiesOverrides()
Q_DECL_DEPRECATED void	setCanvasPropertiesOverrides (double searchRadiusMapUnits)
	Overrides some map canvas properties inside the map tool for the upcoming identify requests.
void	setPropertiesOverrides (IdentifyProperties overrides)
	Overrides some map canvas properties inside the map tool for the upcoming identify requests.
Protected Member Functions inherited from QgsMapTool
	QgsMapTool (QgsMapCanvas *canvas)
	Constructor takes a map canvas as a parameter.
QgsMapLayer *	layer (const QString &id)
	Returns the map layer with the matching ID, or nullptr if no layers could be found.
void	setToolName (const QString &name)
	Sets the tool's name.
QPoint	toCanvasCoordinates (const QgsPointXY &point) const
	Transforms a point from map coordinates to screen coordinates.
QgsPoint	toLayerCoordinates (const QgsMapLayer *layer, const QgsPoint &point)
	Transforms a point from map coordinates to layer coordinates.
QgsPointXY	toLayerCoordinates (const QgsMapLayer *layer, const QgsPointXY &point)
	Transforms a point from map coordinates to layer coordinates.
QgsRectangle	toLayerCoordinates (const QgsMapLayer *layer, const QgsRectangle &rect)
	Transforms a rect from map coordinates to layer coordinates.
QgsPointXY	toLayerCoordinates (const QgsMapLayer *layer, QPoint point)
	Transforms a point from screen coordinates to layer coordinates.
QgsPoint	toMapCoordinates (const QgsMapLayer *layer, const QgsPoint &point)
	Transforms a point from layer coordinates to map coordinates (which is different in case reprojection is used).
QgsPointXY	toMapCoordinates (const QgsMapLayer *layer, const QgsPointXY &point)
	Transforms a point from layer coordinates to map coordinates (which is different in case reprojection is used).

Additional Inherited Members
Public Types inherited from QgsMapToolIdentify
enum	IdentifyMode {   DefaultQgsSetting = -1 , ActiveLayer , TopDownStopAtFirst , TopDownAll ,   LayerSelection }
typedef QFlags< Type >	LayerType
enum	Type {   VectorLayer = 1 , RasterLayer = 2 , MeshLayer = 4 , VectorTileLayer = 8 ,   PointCloudLayer = 16 , AllLayers = VectorLayer | RasterLayer | MeshLayer | VectorTileLayer | PointCloudLayer }
Public Types inherited from QgsMapTool
enum	Flag { Transient = 1 << 1 , EditTool = 1 << 2 , AllowZoomRect = 1 << 3 , ShowContextMenu = 1 << 4 }
	Enumeration of flags that adjust the way the map tool operates. More...
typedef QFlags< Flag >	Flags
Public Slots inherited from QgsMapToolIdentify
void	formatChanged (QgsRasterLayer *layer)
Static Public Member Functions inherited from QgsMapToolIdentify
static void	fromPointCloudIdentificationToIdentifyResults (QgsPointCloudLayer *layer, const QVector< QVariantMap > &identified, QList< QgsMapToolIdentify::IdentifyResult > &results)
	Converts point cloud identification results from variant maps to QgsMapToolIdentify::IdentifyResult and apply some formatting.
Static Public Member Functions inherited from QgsMapTool
static double	searchRadiusMM ()
	Gets search radius in mm.
static double	searchRadiusMU (const QgsRenderContext &context)
	Gets search radius in map units for given context.
static double	searchRadiusMU (QgsMapCanvas *canvas)
	Gets search radius in map units for given canvas.
Protected Attributes inherited from QgsMapToolIdentify
QgsIdentifyMenu *	mIdentifyMenu = nullptr
Protected Attributes inherited from QgsMapTool
QAction *	mAction = nullptr
	Optional pointer to an action that will be checked on map tool activation and unchecked on map tool deactivation.
QAbstractButton *	mButton = nullptr
	Optional pointer to a button that will be checked on map tool activation and unchecked on map tool deactivation.
QPointer< QgsMapCanvas >	mCanvas
	The pointer to the map canvas.
QCursor	mCursor
	The cursor used in the map tool.
QString	mToolName
	The translated name of the map tool.

Detailed Description

A map tool to identify a feature on a chosen layer.

Once the map tool is enable, user can click on the map canvas to identify a feature. A signal will then be emitted.

Definition at line 29 of file qgsmaptoolidentifyfeature.h.

Constructor & Destructor Documentation

QgsMapToolIdentifyFeature()

QgsMapToolIdentifyFeature::QgsMapToolIdentifyFeature	(	QgsMapCanvas *	canvas,
		QgsVectorLayer *	vl = nullptr
	)

QgsMapToolIdentifyFeature is a map tool to identify a feature on a chosen layer.

Parameters

canvas	the map canvas
vl	the vector layer. The map tool can be initialized without any layer and can be set afterward.

Definition at line 22 of file qgsmaptoolidentifyfeature.cpp.

Member Function Documentation

canvasReleaseEvent()

void QgsMapToolIdentifyFeature::canvasReleaseEvent ( QgsMapMouseEvent *  e )

overridevirtual

Mouse release event for overriding. Default implementation does nothing.

Reimplemented from QgsMapToolIdentify.

Definition at line 32 of file qgsmaptoolidentifyfeature.cpp.

featureIdentified [1/2]

void QgsMapToolIdentifyFeature::featureIdentified ( const QgsFeature &  feature )

signal

Emitted when a feature has been identified.

featureIdentified [2/2]

Q_DECL_DEPRECATED void QgsMapToolIdentifyFeature::featureIdentified ( QgsFeatureId  id )

signal

Emitted when a feature has been identified by its id.

Deprecated:

QGIS 3.40. Use the signal with a QgsFeature argument instead.

keyPressEvent()

void QgsMapToolIdentifyFeature::keyPressEvent ( QKeyEvent *  e )

overrideprotectedvirtual

Key event for overriding. Default implementation does nothing.

Reimplemented from QgsMapTool.

Definition at line 48 of file qgsmaptoolidentifyfeature.cpp.

setLayer()

void QgsMapToolIdentifyFeature::setLayer ( QgsVectorLayer *  vl )

inline

change the layer used by the map tool to identify

Definition at line 42 of file qgsmaptoolidentifyfeature.h.

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The documentation for this class was generated from the following files:

• /build/qgis-3.99.0+git20250718+f78f5286a64+99sid/src/gui/maptools/qgsmaptoolidentifyfeature.h
• /build/qgis-3.99.0+git20250718+f78f5286a64+99sid/src/gui/maptools/qgsmaptoolidentifyfeature.cpp