Map tool for identifying features in layers. More...

#include <qgsmaptoolidentify.h>

Inheritance diagram for QgsMapToolIdentify:

Classes
struct	IdentifyResult

Public Types
enum	IdentifyMode { DefaultQgsSetting = -1, ActiveLayer, TopDownStopAtFirst, TopDownAll, LayerSelection }

enum	Type { VectorLayer = 1, RasterLayer = 2, MeshLayer = 4, AllLayers = VectorLayer \| RasterLayer \| MeshLayer }

Public Types inherited from QgsMapTool
enum	Flag { Transient = 1 << 1, EditTool = 1 << 2, AllowZoomRect = 1 << 3 }
	Enumeration of flags that adjust the way the map tool operates. More...

Public Slots
void	formatChanged (QgsRasterLayer *layer)

Signals
void	changedRasterResults (QList< QgsMapToolIdentify::IdentifyResult > &)

void	identifyMessage (const QString &)

void	identifyProgress (int, int)

Signals inherited from QgsMapTool
void	activated ()
	signal emitted once the map tool is activated More...

void	deactivated ()
	signal emitted once the map tool is deactivated More...

void	messageDiscarded ()
	emit signal to clear previous message More...

void	messageEmitted (const QString &message, Qgis::MessageLevel=Qgis::Info)
	emit a message More...

Public Member Functions
	QgsMapToolIdentify (QgsMapCanvas *canvas)
	constructor More...

	~QgsMapToolIdentify () override

void	activate () override
	called when set as currently active map tool More...

void	canvasMoveEvent (QgsMapMouseEvent *e) override
	Mouse move event for overriding. Default implementation does nothing. More...

void	canvasPressEvent (QgsMapMouseEvent *e) override
	Mouse press event for overriding. Default implementation does nothing. More...

void	canvasReleaseEvent (QgsMapMouseEvent *e) override
	Mouse release event for overriding. Default implementation does nothing. More...

void	deactivate () override
	called when map tool is being deactivated More...

Flags	flags () const override
	Returns the flags for the map tool. More...

QList< QgsMapToolIdentify::IdentifyResult >	identify (int x, int y, const QList< QgsMapLayer > &layerList=QList< QgsMapLayer >(), IdentifyMode mode=DefaultQgsSetting)
	Performs the identification. More...

QList< QgsMapToolIdentify::IdentifyResult >	identify (int x, int y, IdentifyMode mode, LayerType layerType=AllLayers)
	Performs the identification. More...

QList< QgsMapToolIdentify::IdentifyResult >	identify (const QgsGeometry &geometry, IdentifyMode mode, LayerType layerType)
	Performs identification based on a geometry (in map coordinates) More...

QList< QgsMapToolIdentify::IdentifyResult >	identify (const QgsGeometry &geometry, IdentifyMode mode, const QList< QgsMapLayer *> &layerList, LayerType layerType)
	Performs identification based on a geometry (in map coordinates) More...

QgsIdentifyMenu *	identifyMenu ()
	Returns a pointer to the identify menu which will be used in layer selection mode this menu can also be customized. More...

Public Member Functions inherited from QgsMapTool
	~QgsMapTool () override

QAction *	action ()
	Returns associated action with map tool or `nullptr` if no action is associated. More...

QAbstractButton *	button ()
	Returns associated button with map tool or `nullptr` if no button is associated. More...

QgsMapCanvas *	canvas () const
	returns pointer to the tool's map canvas More...

virtual void	canvasDoubleClickEvent (QgsMapMouseEvent *e)
	Mouse double-click event for overriding. Default implementation does nothing. More...

virtual void	clean ()
	convenient method to clean members More...

virtual bool	gestureEvent (QGestureEvent *e)
	gesture event for overriding. Default implementation does nothing. More...

bool	isActive () const
	Returns if the current map tool active on the map canvas. More...

virtual void	keyPressEvent (QKeyEvent *e)
	Key event for overriding. Default implementation does nothing. More...

virtual void	keyReleaseEvent (QKeyEvent *e)
	Key event for overriding. Default implementation does nothing. More...

void	setAction (QAction *action)
	Use this to associate a QAction to this maptool. More...

void	setButton (QAbstractButton *button)
	Use this to associate a button to this maptool. More...

virtual void	setCursor (const QCursor &cursor)
	Sets a user defined cursor. More...

QString	toolName ()
	Emit map tool changed with the old tool. More...

virtual void	wheelEvent (QWheelEvent *e)
	Mouse wheel event for overriding. Default implementation does nothing. More...

Protected Member Functions
QMap< QString, QString >	derivedAttributesForPoint (const QgsPoint &point)
	Returns derived attributes map for a clicked point in map coordinates. May be 2D or 3D point. More...

QList< QgsMapToolIdentify::IdentifyResult >	identify (int x, int y, IdentifyMode mode, const QList< QgsMapLayer *> &layerList, LayerType layerType=AllLayers)
	Performs the identification. More...

bool	identifyLayer (QList< QgsMapToolIdentify::IdentifyResult > results, QgsMapLayer layer, const QgsPointXY &point, const QgsRectangle &viewExtent, double mapUnitsPerPixel, QgsMapToolIdentify::LayerType layerType=AllLayers)
	Call the right method depending on layer type. More...

bool	identifyMeshLayer (QList< QgsMapToolIdentify::IdentifyResult > results, QgsMeshLayer layer, const QgsPointXY &point)
	Identifies data from active scalar and vector dataset from the mesh layer. More...

bool	identifyRasterLayer (QList< QgsMapToolIdentify::IdentifyResult > results, QgsRasterLayer layer, QgsPointXY point, const QgsRectangle &viewExtent, double mapUnitsPerPixel)

bool	identifyVectorLayer (QList< QgsMapToolIdentify::IdentifyResult > results, QgsVectorLayer layer, const QgsPointXY &point)

void	restoreCanvasPropertiesOverrides ()
	Clears canvas properties overrides previously set with setCanvasPropertiesOverrides() More...

void	setCanvasPropertiesOverrides (double searchRadiusMapUnits)
	Overrides some map canvas properties inside the map tool for the upcoming identify requests. More...

Protected Member Functions inherited from QgsMapTool
	QgsMapTool (QgsMapCanvas *canvas)
	constructor takes map canvas as a parameter More...

QPoint	toCanvasCoordinates (const QgsPointXY &point) const
	transformation from map coordinates to screen coordinates More...

QgsPointXY	toLayerCoordinates (const QgsMapLayer *layer, QPoint point)
	transformation from screen coordinates to layer's coordinates More...

QgsPointXY	toLayerCoordinates (const QgsMapLayer *layer, const QgsPointXY &point)
	transformation from map coordinates to layer's coordinates More...

QgsRectangle	toLayerCoordinates (const QgsMapLayer *layer, const QgsRectangle &rect)
	trnasformation of the rect from map coordinates to layer's coordinates More...

QgsPointXY	toMapCoordinates (QPoint point)
	transformation from screen coordinates to map coordinates More...

QgsPointXY	toMapCoordinates (const QgsMapLayer *layer, const QgsPointXY &point)
	transformation from layer's coordinates to map coordinates (which is different in case reprojection is used) More...

QgsPoint	toMapCoordinates (const QgsMapLayer *layer, const QgsPoint &point)
	transformation from layer's coordinates to map coordinates (which is different in case reprojection is used) More...

Protected Attributes
QgsIdentifyMenu *	mIdentifyMenu = nullptr

Protected Attributes inherited from QgsMapTool
QAction *	mAction = nullptr
	optionally map tool can have pointer to action which will be used to set that action as active More...

QAbstractButton *	mButton = nullptr
	optionally map tool can have pointer to a button which will be used to set that action as active More...

QgsMapCanvas *	mCanvas = nullptr
	pointer to map canvas More...

QCursor	mCursor
	cursor used in map tool More...

QString	mToolName
	translated name of the map tool More...

Additional Inherited Members
Static Public Member Functions inherited from QgsMapTool
static double	searchRadiusMM ()
	Gets search radius in mm. More...

static double	searchRadiusMU (const QgsRenderContext &context)
	Gets search radius in map units for given context. More...

static double	searchRadiusMU (QgsMapCanvas *canvas)
	Gets search radius in map units for given canvas. More...

Detailed Description

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)

Definition at line 46 of file qgsmaptoolidentify.h.

Member Enumeration Documentation

◆ IdentifyMode

enum QgsMapToolIdentify::IdentifyMode

Enumerator
DefaultQgsSetting
ActiveLayer
TopDownStopAtFirst
TopDownAll
LayerSelection

Definition at line 52 of file qgsmaptoolidentify.h.

◆ Type

enum QgsMapToolIdentify::Type

Enumerator
VectorLayer
RasterLayer
MeshLayer	Since QGIS 3.6
AllLayers

Definition at line 62 of file qgsmaptoolidentify.h.

Constructor & Destructor Documentation

◆ QgsMapToolIdentify()

QgsMapToolIdentify::QgsMapToolIdentify ( QgsMapCanvas * canvas )

constructor

Definition at line 55 of file qgsmaptoolidentify.cpp.

◆ ~QgsMapToolIdentify()

QgsMapToolIdentify::~QgsMapToolIdentify ( )

override

Definition at line 64 of file qgsmaptoolidentify.cpp.

Member Function Documentation

◆ activate()

void QgsMapToolIdentify::activate ( )

overridevirtual

called when set as currently active map tool

Reimplemented from QgsMapTool.

Definition at line 194 of file qgsmaptoolidentify.cpp.

◆ canvasMoveEvent()

void QgsMapToolIdentify::canvasMoveEvent ( QgsMapMouseEvent * e )

overridevirtual

Mouse move event for overriding. Default implementation does nothing.

Reimplemented from QgsMapTool.

Definition at line 69 of file qgsmaptoolidentify.cpp.

◆ canvasPressEvent()

void QgsMapToolIdentify::canvasPressEvent ( QgsMapMouseEvent * e )

overridevirtual

Mouse press event for overriding. Default implementation does nothing.

Reimplemented from QgsMapTool.

Definition at line 74 of file qgsmaptoolidentify.cpp.

◆ canvasReleaseEvent()

void QgsMapToolIdentify::canvasReleaseEvent ( QgsMapMouseEvent * e )

overridevirtual

Mouse release event for overriding. Default implementation does nothing.

Reimplemented from QgsMapTool.

Reimplemented in QgsMapToolIdentifyFeature.

Definition at line 79 of file qgsmaptoolidentify.cpp.

◆ changedRasterResults

void QgsMapToolIdentify::changedRasterResults ( QList< QgsMapToolIdentify::IdentifyResult > & )

signal

◆ deactivate()

void QgsMapToolIdentify::deactivate ( )

overridevirtual

called when map tool is being deactivated

Reimplemented from QgsMapTool.

Definition at line 199 of file qgsmaptoolidentify.cpp.

◆ derivedAttributesForPoint()

QMap< QString, QString > QgsMapToolIdentify::derivedAttributesForPoint ( const QgsPoint & point )

protected

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

Definition at line 317 of file qgsmaptoolidentify.cpp.

◆ flags()

Flags QgsMapToolIdentify::flags ( ) const

inlineoverridevirtual

Returns the flags for the map tool.

Since: QGIS 2.16

Reimplemented from QgsMapTool.

Definition at line 100 of file qgsmaptoolidentify.h.

◆ formatChanged

void QgsMapToolIdentify::formatChanged ( QgsRasterLayer * layer )

slot

Definition at line 926 of file qgsmaptoolidentify.cpp.

◆ identify() [1/5]

QList< QgsMapToolIdentify::IdentifyResult > QgsMapToolIdentify::identify	(	int	x,
		int	y,
		const QList< QgsMapLayer *> &	layerList = `QList<QgsMapLayer *>()`,
		IdentifyMode	mode = `DefaultQgsSetting`
	)

Performs the identification.

Parameters

x	x coordinates of mouseEvent
y	y coordinates of mouseEvent
layerList	Performs the identification within the given list of layers. Default value is an empty list, i.e. uses all the layers.
mode	Identification mode. Can use Qgis default settings or a defined mode. Default mode is DefaultQgsSetting.

Returns: a list of IdentifyResult

Definition at line 84 of file qgsmaptoolidentify.cpp.

◆ identify() [2/5]

QList< QgsMapToolIdentify::IdentifyResult > QgsMapToolIdentify::identify	(	int	x,
		int	y,
		IdentifyMode	mode,
		LayerType	layerType = `AllLayers`
	)

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

Definition at line 89 of file qgsmaptoolidentify.cpp.

◆ identify() [3/5]

QList< QgsMapToolIdentify::IdentifyResult > QgsMapToolIdentify::identify	(	const QgsGeometry &	geometry,
		IdentifyMode	mode,
		LayerType	layerType
	)

Performs identification based on a geometry (in map coordinates)

Definition at line 99 of file qgsmaptoolidentify.cpp.

◆ identify() [4/5]

QList< QgsMapToolIdentify::IdentifyResult > QgsMapToolIdentify::identify	(	const QgsGeometry &	geometry,
		IdentifyMode	mode,
		const QList< QgsMapLayer *> &	layerList,
		LayerType	layerType
	)

Performs identification based on a geometry (in map coordinates)

Definition at line 104 of file qgsmaptoolidentify.cpp.

◆ identify() [5/5]

QList< QgsMapToolIdentify::IdentifyResult > QgsMapToolIdentify::identify	(	int	x,
		int	y,
		IdentifyMode	mode,
		const QList< QgsMapLayer *> &	layerList,
		LayerType	layerType = `AllLayers`
	)

protected

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).

Returns: a list of IdentifyResult

Definition at line 94 of file qgsmaptoolidentify.cpp.

◆ identifyLayer()

bool QgsMapToolIdentify::identifyLayer	(	QList< QgsMapToolIdentify::IdentifyResult > *	results,
		QgsMapLayer *	layer,
		const QgsPointXY &	point,
		const QgsRectangle &	viewExtent,
		double	mapUnitsPerPixel,
		QgsMapToolIdentify::LayerType	layerType = `AllLayers`
	)

protected

Call the right method depending on layer type.

Definition at line 204 of file qgsmaptoolidentify.cpp.

◆ identifyMenu()

QgsIdentifyMenu* QgsMapToolIdentify::identifyMenu ( )

inline

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

Definition at line 138 of file qgsmaptoolidentify.h.

◆ identifyMeshLayer()

bool QgsMapToolIdentify::identifyMeshLayer	(	QList< QgsMapToolIdentify::IdentifyResult > *	results,
		QgsMeshLayer *	layer,
		const QgsPointXY &	point
	)

protected

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

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

Since: QGIS 3.6

Definition at line 240 of file qgsmaptoolidentify.cpp.

◆ identifyMessage

void QgsMapToolIdentify::identifyMessage ( const QString & )

signal

◆ identifyProgress

void QgsMapToolIdentify::identifyProgress	(	int	,
		int
	)

signal

◆ identifyRasterLayer()

bool QgsMapToolIdentify::identifyRasterLayer	(	QList< QgsMapToolIdentify::IdentifyResult > *	results,
		QgsRasterLayer *	layer,
		QgsPointXY	point,
		const QgsRectangle &	viewExtent,
		double	mapUnitsPerPixel
	)

protected

Definition at line 681 of file qgsmaptoolidentify.cpp.

◆ identifyVectorLayer()

bool QgsMapToolIdentify::identifyVectorLayer	(	QList< QgsMapToolIdentify::IdentifyResult > *	results,
		QgsVectorLayer *	layer,
		const QgsPointXY &	point
	)

protected

Definition at line 229 of file qgsmaptoolidentify.cpp.

◆ restoreCanvasPropertiesOverrides()

void QgsMapToolIdentify::restoreCanvasPropertiesOverrides ( )

protected

Clears canvas properties overrides previously set with setCanvasPropertiesOverrides()

See also: setCanvasPropertiesOverrides()

Since: QGIS 3.4

Definition at line 189 of file qgsmaptoolidentify.cpp.

◆ setCanvasPropertiesOverrides()

void QgsMapToolIdentify::setCanvasPropertiesOverrides ( double searchRadiusMapUnits )

protected

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.

See also: restoreCanvasPropertiesOverrides()

Since: QGIS 3.4

Definition at line 184 of file qgsmaptoolidentify.cpp.

Member Data Documentation

◆ mIdentifyMenu

QgsIdentifyMenu* QgsMapToolIdentify::mIdentifyMenu = nullptr

protected

Definition at line 163 of file qgsmaptoolidentify.h.

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

/build/qgis-3.10.0+15buster/src/gui/qgsmaptoolidentify.h
/build/qgis-3.10.0+15buster/src/gui/qgsmaptoolidentify.cpp

Classes

Public Types

Public Slots

Signals

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Member Enumeration Documentation

◆ IdentifyMode

◆ Type

Constructor & Destructor Documentation

◆ QgsMapToolIdentify()

◆ ~QgsMapToolIdentify()

Member Function Documentation

◆ activate()

◆ canvasMoveEvent()

◆ canvasPressEvent()

◆ canvasReleaseEvent()

◆ changedRasterResults

◆ deactivate()

◆ derivedAttributesForPoint()

◆ flags()

◆ formatChanged

◆ identify() [1/5]

◆ identify() [2/5]

◆ identify() [3/5]

◆ identify() [4/5]

◆ identify() [5/5]

◆ identifyLayer()

◆ identifyMenu()

◆ identifyMeshLayer()

◆ identifyMessage

◆ identifyProgress

◆ identifyRasterLayer()

◆ identifyVectorLayer()

◆ restoreCanvasPropertiesOverrides()

◆ setCanvasPropertiesOverrides()

Member Data Documentation

◆ mIdentifyMenu