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

#include <qgsmaptool.h>

Inheritance diagram for QgsMapTool:

Collaboration diagram for QgsMapTool:

Public Member Functions
virtual	~QgsMapTool ()
	virtual destructor
QAction *	action ()
	Return associated action with map tool or NULL if no action is associated.
virtual void	activate ()
	called when set as currently active map tool
QAbstractButton *	button ()
	Return associated button with map tool or NULL if no button is associated.
QgsMapCanvas *	canvas ()
	returns pointer to the tool's map canvas
virtual void	canvasDoubleClickEvent (QMouseEvent *e)
	Mouse double click event for overriding. Default implementation does nothing.
virtual void	canvasMoveEvent (QMouseEvent *e)
	Mouse move event for overriding. Default implementation does nothing.
virtual void	canvasPressEvent (QMouseEvent *e)
	Mouse press event for overriding. Default implementation does nothing.
virtual void	canvasReleaseEvent (QMouseEvent *e)
	Mouse release event for overriding. Default implementation does nothing.
virtual void	deactivate ()
	called when map tool is being deactivated
virtual bool	isEditTool ()
	Check whether this MapTool performs an edit operation.
virtual bool	isTransient ()
	Check whether this MapTool performs a zoom or pan operation.
virtual void	keyPressEvent (QKeyEvent *e)
	Key event for overriding. Default implementation does nothing.
virtual void	keyReleaseEvent (QKeyEvent *e)
	Key event for overriding.
virtual void	renderComplete ()
	Called when rendering has finished. Default implementation does nothing.
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	wheelEvent (QWheelEvent *e)
	Mouse wheel event for overriding.
Protected Member Functions
	QgsMapTool (QgsMapCanvas *canvas)
	constructor takes map canvas as a parameter
QPoint	toCanvasCoordinates (const QgsPoint &point)
	transformation from map coordinates to screen coordinates
QgsPoint	toLayerCoordinates (QgsMapLayer *layer, const QPoint &point)
	transformation from screen coordinates to layer's coordinates
QgsPoint	toLayerCoordinates (QgsMapLayer *layer, const QgsPoint &point)
	transformation from map coordinates to layer's coordinates
QgsRectangle	toLayerCoordinates (QgsMapLayer *layer, const QgsRectangle &rect)
	trnasformation of the rect from map coordinates to layer's coordinates
QgsPoint	toMapCoordinates (const QPoint &point)
	transformation from screen coordinates to map coordinates
QgsPoint	toMapCoordinates (QgsMapLayer *layer, const QgsPoint &point)
	transformation from layer's coordinates to map coordinates (which is different in case reprojection is used)
Protected Attributes
QAction *	mAction
	optionally map tool can have pointer to action which will be used to set that action as active
QAbstractButton *	mButton
	optionally map tool can have pointer to a button which will be used to set that action as active
QgsMapCanvas *	mCanvas
	pointer to map canvas
QCursor	mCursor
	cursor used in map tool

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 46 of file qgsmaptool.h.

Constructor & Destructor Documentation

QgsMapTool::~QgsMapTool ( ) [virtual]

virtual destructor

Definition at line 30 of file qgsmaptool.cpp.

References mCanvas, and QgsMapCanvas::unsetMapTool().

QgsMapTool::QgsMapTool ( QgsMapCanvas * canvas ) [protected]

constructor takes map canvas as a parameter

Definition at line 24 of file qgsmaptool.cpp.

Member Function Documentation

QAction * QgsMapTool::action ( )

Return associated action with map tool or NULL if no action is associated.

Definition at line 98 of file qgsmaptool.cpp.

References mAction.

Referenced by setAction().

void QgsMapTool::activate ( ) [virtual]

called when set as currently active map tool

Reimplemented in QgsMapToolIdentify, and QgsMapToolTouch.

Definition at line 71 of file qgsmaptool.cpp.

References mAction, mButton, mCanvas, mCursor, and QgsDebugMsg.

Referenced by QgsMapCanvas::setMapTool().

QAbstractButton * QgsMapTool::button ( )

Return associated button with map tool or NULL if no button is associated.

Definition at line 108 of file qgsmaptool.cpp.

References mButton.

Referenced by setButton().

QgsMapCanvas * QgsMapTool::canvas ( )

returns pointer to the tool's map canvas

Definition at line 171 of file qgsmaptool.cpp.

References mCanvas.

void QgsMapTool::canvasDoubleClickEvent ( QMouseEvent * e ) [virtual]

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

Reimplemented in QgsMapToolTouch.

Definition at line 119 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::mouseDoubleClickEvent().

void QgsMapTool::canvasMoveEvent ( QMouseEvent * e ) [virtual]

Mouse move event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolIdentify, QgsMapToolTouch, QgsMapToolEmitPoint, QgsMapToolZoom, and QgsMapToolPan.

Definition at line 114 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::mouseMoveEvent().

void QgsMapTool::canvasPressEvent ( QMouseEvent * e ) [virtual]

Mouse press event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolIdentify, QgsMapToolEmitPoint, and QgsMapToolZoom.

Definition at line 124 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::mousePressEvent().

void QgsMapTool::canvasReleaseEvent ( QMouseEvent * e ) [virtual]

Mouse release event for overriding. Default implementation does nothing.

Reimplemented in QgsMapToolIdentify, QgsMapToolTouch, QgsMapToolEmitPoint, QgsMapToolZoom, and QgsMapToolPan.

Definition at line 129 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::mouseReleaseEvent().

void QgsMapTool::deactivate ( ) [virtual]

called when map tool is being deactivated

Reimplemented in QgsMapToolIdentify, QgsMapToolZoom, and QgsMapToolTouch.

Definition at line 85 of file qgsmaptool.cpp.

References mAction, and mButton.

Referenced by QgsMapCanvas::setMapTool(), QgsMapCanvas::unsetMapTool(), and QgsMapCanvas::~QgsMapCanvas().

bool QgsMapTool::isEditTool ( ) [virtual]

Check whether this MapTool performs an edit operation.

If it does, we will deactivate it when editing is turned off

Definition at line 166 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::mouseReleaseEvent().

bool QgsMapTool::isTransient ( ) [virtual]

Check whether this MapTool performs a zoom or pan operation.

If it does, we will be able to perform the zoom and then resume operations with the original / previously used tool.

Reimplemented in QgsMapToolTouch, QgsMapToolZoom, and QgsMapToolPan.

Definition at line 161 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::mouseReleaseEvent(), and QgsMapCanvas::setMapTool().

void QgsMapTool::keyPressEvent ( QKeyEvent * e ) [virtual]

Key event for overriding. Default implementation does nothing.

Definition at line 139 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::keyPressEvent().

void QgsMapTool::keyReleaseEvent ( QKeyEvent * e ) [virtual]

Key event for overriding.

Default implementation does nothing. Added in version 1.1

Definition at line 144 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::keyReleaseEvent().

void QgsMapTool::renderComplete ( ) [virtual]

Called when rendering has finished. Default implementation does nothing.

Definition at line 157 of file qgsmaptool.cpp.

Referenced by QgsMapCanvas::refresh().

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 93 of file qgsmaptool.cpp.

References action(), and mAction.

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 103 of file qgsmaptool.cpp.

References button(), and mButton.

QPoint QgsMapTool::toCanvasCoordinates ( const QgsPoint & point ) [protected]

transformation from map coordinates to screen coordinates

Definition at line 63 of file qgsmaptool.cpp.

References QgsMapCanvas::getCoordinateTransform(), mCanvas, QgsMapToPixel::transformInPlace(), QgsPoint::x(), and QgsPoint::y().