Abstract base class for all map tools. More...

#include <qgsmaptool.h>

Inheritance diagram for QgsMapTool:

[legend]

Public Types
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

Signals
void	activated ()
	signal emitted once the map tool is activated

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

void	messageDiscarded ()
	emit signal to clear previous message

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

void	reactivated ()

Public Member Functions
	~QgsMapTool () override

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

virtual void	activate ()
	called when set as currently active map tool

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

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

virtual void	canvasReleaseEvent (QgsMapMouseEvent *e)
	Mouse release 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 void	deactivate ()
	called when map tool is being deactivated

virtual Flags	flags () const
	Returns the flags for the map tool.

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

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.

Static Public Member Functions
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 Member Functions
	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).

Protected Attributes
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.

Friends
class	QgsMapCanvas

class	TestQgsMapToolEdit

Detailed Description

Abstract base class for all map tools.

Map tools are user interactive tools for manipulating the map canvas. For example map pan and zoom features are implemented as map tools.

Definition at line 70 of file qgsmaptool.h.

Member Typedef Documentation

◆ Flags

typedef QFlags< Flag > QgsMapTool::Flags

Definition at line 116 of file qgsmaptool.h.

Member Enumeration Documentation

◆ Flag

enum QgsMapTool::Flag

Enumeration of flags that adjust the way the map tool operates.

Enumerator
Transient	Deprecated since QGIS 3.36 – no longer used by QGIS and will be removed in QGIS 4.0.
EditTool	Map tool is an edit tool, which can only be used when layer is editable.
AllowZoomRect	Allow zooming by rectangle (by holding shift and dragging) while the tool is active.
ShowContextMenu	Show a context menu when right-clicking with the tool (since QGIS 3.14). See populateContextMenu().

Definition at line 109 of file qgsmaptool.h.

Constructor & Destructor Documentation

◆ ~QgsMapTool()

QgsMapTool::~QgsMapTool ( )

override

Definition at line 35 of file qgsmaptool.cpp.

◆ QgsMapTool()

QgsMapTool::QgsMapTool ( QgsMapCanvas * canvas )

protected

Constructor takes a map canvas as a parameter.

Definition at line 27 of file qgsmaptool.cpp.

Member Function Documentation

◆ action()

QAction * QgsMapTool::action ( )

Returns associated action with map tool or nullptr if no action is associated.

Definition at line 146 of file qgsmaptool.cpp.

◆ activate()

void QgsMapTool::activate ( )

virtual

called when set as currently active map tool

Reimplemented in QgsMapToolAdvancedDigitizing, QgsMapToolCapture, QgsMapToolDigitizeFeature, QgsMapToolExtent, QgsMapToolIdentify, and QgsMapToolPan.

Definition at line 94 of file qgsmaptool.cpp.

◆ activated

void QgsMapTool::activated ( )

signal

signal emitted once the map tool is activated

◆ button()

QAbstractButton * QgsMapTool::button ( )

Returns associated button with map tool or nullptr if no button is associated.

Definition at line 161 of file qgsmaptool.cpp.

◆ canvas()

QgsMapCanvas * QgsMapTool::canvas ( ) const

returns pointer to the tool's map canvas

Definition at line 221 of file qgsmaptool.cpp.

◆ canvasDoubleClickEvent()

void QgsMapTool::canvasDoubleClickEvent ( QgsMapMouseEvent * e )

virtual

Mouse double-click event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolPan, and QgsMapToolModifyAnnotation.

Definition at line 179 of file qgsmaptool.cpp.

◆ canvasMoveEvent()

void QgsMapTool::canvasMoveEvent ( QgsMapMouseEvent * e )

virtual

Mouse move event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolAdvancedDigitizing, QgsMapToolEmitPoint, QgsMapToolExtent, QgsMapToolIdentify, QgsMapToolPan, and QgsMapToolZoom.

Definition at line 174 of file qgsmaptool.cpp.

◆ canvasPressEvent()

void QgsMapTool::canvasPressEvent ( QgsMapMouseEvent * e )

virtual

Mouse press event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolAdvancedDigitizing, QgsMapToolEmitPoint, QgsMapToolExtent, QgsMapToolIdentify, QgsMapToolPan, and QgsMapToolZoom.

Definition at line 184 of file qgsmaptool.cpp.

◆ canvasReleaseEvent()

void QgsMapTool::canvasReleaseEvent ( QgsMapMouseEvent * e )

virtual

Mouse release event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolAdvancedDigitizing, QgsMapToolEmitPoint, QgsMapToolExtent, QgsMapToolIdentify, QgsMapToolIdentifyFeature, QgsMapToolPan, and QgsMapToolZoom.

Definition at line 189 of file qgsmaptool.cpp.

◆ canvasToolTipEvent()

bool QgsMapTool::canvasToolTipEvent ( QHelpEvent * e )

virtual

Tooltip event for overriding.

Default implementation does nothing. Returns whether the event was handled by the tool and should not be propagated further.

Since: QGIS 3.22

Definition at line 215 of file qgsmaptool.cpp.

◆ clean()

void QgsMapTool::clean ( )

virtual

convenient method to clean members

Reimplemented in QgsMapToolCapture.

Definition at line 126 of file qgsmaptool.cpp.

◆ deactivate()

void QgsMapTool::deactivate ( )

virtual

called when map tool is being deactivated

Reimplemented in QgsMapToolModifyAnnotation, QgsMapToolAdvancedDigitizing, QgsMapToolCapture, QgsMapToolDigitizeFeature, QgsMapToolExtent, QgsMapToolIdentify, QgsMapToolPan, and QgsMapToolZoom.

Definition at line 110 of file qgsmaptool.cpp.

◆ deactivated

void QgsMapTool::deactivated ( )

signal

signal emitted once the map tool is deactivated

◆ flags()

virtual Flags QgsMapTool::flags ( ) const

inlinevirtual

Returns the flags for the map tool.

Reimplemented in QgsMapToolEdit, QgsMapToolEmitPoint, QgsMapToolExtent, QgsMapToolIdentify, QgsMapToolPan, and QgsMapToolZoom.

Definition at line 121 of file qgsmaptool.h.

◆ gestureEvent()

bool QgsMapTool::gestureEvent ( QGestureEvent * e )

virtual

gesture event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolPan.

Definition at line 209 of file qgsmaptool.cpp.

◆ isActive()

bool QgsMapTool::isActive ( ) const

Returns if the current map tool active on the map canvas.

Since: QGIS 3.4

Definition at line 151 of file qgsmaptool.cpp.

◆ keyPressEvent()

void QgsMapTool::keyPressEvent ( QKeyEvent * e )

virtual

Key event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolCapture, QgsMapToolDigitizeFeature, QgsMapToolIdentifyFeature, QgsMapToolZoom, and QgsMapToolModifyAnnotation.

Definition at line 199 of file qgsmaptool.cpp.

◆ keyReleaseEvent()

void QgsMapTool::keyReleaseEvent ( QKeyEvent * e )

virtual

Key event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolZoom.

Definition at line 204 of file qgsmaptool.cpp.

◆ layer()

QgsMapLayer * QgsMapTool::layer ( const QString & id )

protected

Returns the map layer with the matching ID, or nullptr if no layers could be found.

This method searches both layers associated with the map canvas (see QgsMapCanvas::layers()) and layers from the QgsProject associated with the canvas. It can be used to resolve layer IDs to layers which may be visible in the canvas, but not associated with a QgsProject.

Since: QGIS 3.22

Definition at line 84 of file qgsmaptool.cpp.

◆ messageDiscarded

void QgsMapTool::messageDiscarded ( )

signal

emit signal to clear previous message

◆ messageEmitted

void QgsMapTool::messageEmitted	(	const QString &	message,
		Qgis::MessageLevel	= `Qgis::MessageLevel::Info`
	)

signal

emit a message

◆ populateContextMenu()

void QgsMapTool::populateContextMenu ( QMenu * menu )

virtual

Allows the tool to populate and customize the given menu, prior to showing it in response to a right-mouse button click.

menu will be initially populated with a set of default, generic actions. Any new actions added to the menu should be correctly parented to menu.

The default implementation does nothing.

Note: The context menu is only shown when the ShowContextMenu flag is present in flags().

Since: QGIS 3.14

Definition at line 255 of file qgsmaptool.cpp.

◆ populateContextMenuWithEvent()

bool QgsMapTool::populateContextMenuWithEvent	(	QMenu *	menu,
		QgsMapMouseEvent *	event
	)

virtual

Allows the tool to populate and customize the given menu, prior to showing it in response to a right-mouse button click.

menu will be initially populated with a set of default, generic actions. Any new actions added to the menu should be correctly parented to menu.

A pointer to the map mouse event can be provided to allow particular behavior depending on the map tool.

This method can return true to inform the caller that the menu was effectively populated.

The default implementation does nothing and returns false.

Note: The context menu is only shown when the ShowContextMenu flag is present in flags().

Since: QGIS 3.18

Definition at line 261 of file qgsmaptool.cpp.

◆ reactivate()

void QgsMapTool::reactivate ( )

virtual

Called when the map tool is being activated while it is already active.

The default implementation emits the reactivated () signal.

Since: QGIS 3.32

Definition at line 121 of file qgsmaptool.cpp.

◆ reactivated

void QgsMapTool::reactivated ( )

signal

Since: QGIS 3.32 signal emitted when the map tool is activated while it is already active

◆ searchRadiusMM()

double QgsMapTool::searchRadiusMM ( )

static

Gets search radius in mm.

Used by identify, tip etc. The values is currently set in identify tool options (move somewhere else?) and defaults to Qgis::DEFAULT_SEARCH_RADIUS_MM.

Definition at line 226 of file qgsmaptool.cpp.

◆ searchRadiusMU() [1/2]

double QgsMapTool::searchRadiusMU ( const QgsRenderContext & context )

static

Gets search radius in map units for given context.

Used by identify, tip etc. The values is calculated from searchRadiusMM().

Definition at line 238 of file qgsmaptool.cpp.

◆ searchRadiusMU() [2/2]

double QgsMapTool::searchRadiusMU ( QgsMapCanvas * canvas )

static

Gets search radius in map units for given canvas.

Used by identify, tip etc. The values is calculated from searchRadiusMM().

Definition at line 243 of file qgsmaptool.cpp.

◆ setAction()

void QgsMapTool::setAction ( QAction * action )

Use this to associate a QAction to this maptool.

Then when the setMapTool method of mapcanvas is called the action state will be set to on. Usually this will cause e.g. a toolbutton to appear pressed in and the previously used toolbutton to pop out.

Definition at line 131 of file qgsmaptool.cpp.

◆ setButton()

void QgsMapTool::setButton ( QAbstractButton * button )

Use this to associate a button to this maptool.

It has the same meaning as setAction() function except it works with a button instead of an QAction.

Definition at line 156 of file qgsmaptool.cpp.

◆ setCursor()

void QgsMapTool::setCursor ( const QCursor & cursor )

virtual

Sets a user defined cursor.

Definition at line 166 of file qgsmaptool.cpp.

◆ setToolName()

void QgsMapTool::setToolName ( const QString & name )

protected

Sets the tool's name.

See also: toolName()

Since: QGIS 3.20

Definition at line 89 of file qgsmaptool.cpp.

◆ toCanvasCoordinates()

QPoint QgsMapTool::toCanvasCoordinates ( const QgsPointXY & point ) const

protected

Transforms a point from map coordinates to screen coordinates.

Definition at line 77 of file qgsmaptool.cpp.

◆ toLayerCoordinates() [1/4]

QgsPoint QgsMapTool::toLayerCoordinates	(	const QgsMapLayer *	layer,
		const QgsPoint &	point
	)

protected

Transforms a point from map coordinates to layer coordinates.

Note: This method is available in the Python bindings as toLayerCoordinatesV2.

Definition at line 62 of file qgsmaptool.cpp.

◆ toLayerCoordinates() [2/4]

QgsPointXY QgsMapTool::toLayerCoordinates	(	const QgsMapLayer *	layer,
		const QgsPointXY &	point
	)

protected

Transforms a point from map coordinates to layer coordinates.

Definition at line 57 of file qgsmaptool.cpp.

◆ toLayerCoordinates() [3/4]

QgsRectangle QgsMapTool::toLayerCoordinates	(	const QgsMapLayer *	layer,
		const QgsRectangle &	rect
	)

protected

Transforms a rect from map coordinates to layer coordinates.

Definition at line 72 of file qgsmaptool.cpp.

◆ toLayerCoordinates() [4/4]

QgsPointXY QgsMapTool::toLayerCoordinates	(	const QgsMapLayer *	layer,
		QPoint	point
	)

protected

Transforms a point from screen coordinates to layer coordinates.

Definition at line 51 of file qgsmaptool.cpp.

◆ toMapCoordinates() [1/3]

QgsPoint QgsMapTool::toMapCoordinates	(	const QgsMapLayer *	layer,
		const QgsPoint &	point
	)

protected

Transforms a point from layer coordinates to map coordinates (which is different in case reprojection is used).

Note: This method is available in the Python bindings as toMapCoordinatesV2.

Definition at line 46 of file qgsmaptool.cpp.

◆ toMapCoordinates() [2/3]

QgsPointXY QgsMapTool::toMapCoordinates	(	const QgsMapLayer *	layer,
		const QgsPointXY &	point
	)

protected

Transforms a point from layer coordinates to map coordinates (which is different in case reprojection is used).

Definition at line 67 of file qgsmaptool.cpp.

◆ toMapCoordinates() [3/3]

QgsPointXY QgsMapTool::toMapCoordinates ( QPoint point )

Transforms a point from screen coordinates to map coordinates.

Definition at line 41 of file qgsmaptool.cpp.

◆ toolName()

QString QgsMapTool::toolName ( )

inline

Emit map tool changed with the old tool.

See also: setToolName()

Definition at line 209 of file qgsmaptool.h.

◆ wheelEvent()

void QgsMapTool::wheelEvent ( QWheelEvent * e )

virtual

Mouse wheel event for overriding. Default implementation does nothing.

Definition at line 194 of file qgsmaptool.cpp.

Friends And Related Symbol Documentation

◆ QgsMapCanvas

friend class QgsMapCanvas

friend

Definition at line 361 of file qgsmaptool.h.

◆ TestQgsMapToolEdit

friend class TestQgsMapToolEdit

friend

Definition at line 362 of file qgsmaptool.h.

Member Data Documentation

◆ mAction

QAction* QgsMapTool::mAction = nullptr

protected

Optional pointer to an action that will be checked on map tool activation and unchecked on map tool deactivation.

Definition at line 350 of file qgsmaptool.h.

◆ mButton

QAbstractButton* QgsMapTool::mButton = nullptr

protected

Optional pointer to a button that will be checked on map tool activation and unchecked on map tool deactivation.

Definition at line 356 of file qgsmaptool.h.

◆ mCanvas

QPointer< QgsMapCanvas > QgsMapTool::mCanvas

protected

The pointer to the map canvas.

Definition at line 341 of file qgsmaptool.h.

◆ mCursor

QCursor QgsMapTool::mCursor

protected

The cursor used in the map tool.

Definition at line 344 of file qgsmaptool.h.

◆ mToolName

QString QgsMapTool::mToolName

protected

The translated name of the map tool.

Definition at line 359 of file qgsmaptool.h.

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

/home/fischer/src/qgis-3.38/src/gui/qgsmaptool.h
/home/fischer/src/qgis-3.38/src/gui/qgsmaptool.cpp

Public Types

Signals

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Friends

Detailed Description

Member Typedef Documentation

◆ Flags

Member Enumeration Documentation

◆ Flag

Constructor & Destructor Documentation

◆ ~QgsMapTool()

◆ QgsMapTool()

Member Function Documentation

◆ action()

◆ activate()

◆ activated

◆ button()

◆ canvas()

◆ canvasDoubleClickEvent()

◆ canvasMoveEvent()

◆ canvasPressEvent()

◆ canvasReleaseEvent()

◆ canvasToolTipEvent()

◆ clean()

◆ deactivate()

◆ deactivated

◆ flags()

◆ gestureEvent()

◆ isActive()

◆ keyPressEvent()

◆ keyReleaseEvent()

◆ layer()

◆ messageDiscarded

◆ messageEmitted

◆ populateContextMenu()

◆ populateContextMenuWithEvent()

◆ reactivate()

◆ reactivated

◆ searchRadiusMM()

◆ searchRadiusMU() [1/2]

◆ searchRadiusMU() [2/2]

◆ setAction()

◆ setButton()

◆ setCursor()

◆ setToolName()

◆ toCanvasCoordinates()

◆ toLayerCoordinates() [1/4]

◆ toLayerCoordinates() [2/4]

◆ toLayerCoordinates() [3/4]

◆ toLayerCoordinates() [4/4]

◆ toMapCoordinates() [1/3]

◆ toMapCoordinates() [2/3]

◆ toMapCoordinates() [3/3]

◆ toolName()

◆ wheelEvent()

Friends And Related Symbol Documentation

◆ QgsMapCanvas

◆ TestQgsMapToolEdit

Member Data Documentation

◆ mAction

◆ mButton

◆ mCanvas

◆ mCursor

◆ mToolName