This class implements a concrete tool to geographic zoom operation using the mouse wheel. More...

#include <ZoomWheel.h>

Inheritance diagram for te::qt::widgets::ZoomWheel:

Public Types
enum	ZoomType { In, Out }
	Defines the zoom type. More...

Public Member Functions
void	applyZoom (const QPointF &point=QPointF(), bool centralize=true)
	Performs the zoom operation on map display, considering the zoom factor, zoom type and the given point. More...

virtual bool	mouseMoveEvent (QMouseEvent *e)
	This event handler can be reimplemented in a concrete tool class to receive mouse move events for the watched object. More...

virtual bool	mousePressEvent (QMouseEvent *e)
	This event handler can be reimplemented in a concrete tool class to receive mouse press events for the watched object. More...

virtual bool	mouseReleaseEvent (QMouseEvent *e)
	This event handler can be reimplemented in a concrete tool class to receive mouse release events for the watched object. More...

virtual void	setCursor (const QCursor &cursor)
	It sets the tool cursor. More...

void	setZoomType (const ZoomType &type)
	Sets the zoom operation type. More...

Initializer Methods
Methods related to instantiation and destruction.
	ZoomWheel (MapDisplay display, const double &zoomFactor=2.0, const bool &centralize=true, QObject parent=0)
	It constructs a zoom wheel tool associated with the given map display. More...

	~ZoomWheel ()
	Destructor. More...

AbstractTool Methods
Methods related with tool behavior.
bool	eventFilter (QObject watched, QEvent e)
	Filters events if this object has been installed as an event filter for the watched object. More...

AbstractTool Methods
Methods related with tool behavior.
virtual bool	mouseDoubleClickEvent (QMouseEvent *e)
	This event handler can be reimplemented in a concrete tool class to receive mouse double click events for the watched object. More...

virtual bool	keyPressEvent (QKeyEvent *e)
	This event handler can be reimplemented in a concrete tool class to receive key press events for the watched object. More...

Protected Attributes
bool	m_centralize
	If TRUE, the reference that will be used will be the center of the map display extent. If FALSE, the position of the wheel will be used as reference. More...

QCursor	m_curCursor
	The current mapdisplay cursor. More...

QCursor	m_cursor
	The default tool cursor. More...

MapDisplay *	m_display
	The map display associated with the tool. More...

double	m_zoomFactor
	Factor used to zoom. i.e. A factor value of 2.0 (default) will generate a new extent twice (%) bigger or smaller, depending of ZoomType. More...

ZoomType	m_zoomType
	Enum that indicates the zoom type. More...

Detailed Description

This class implements a concrete tool to geographic zoom operation using the mouse wheel.

Definition at line 49 of file ZoomWheel.h.

Member Enumeration Documentation

enum te::qt::widgets::Zoom::ZoomType

inherited

Defines the zoom type.

Enumerator
In	Performs the zoom in operation.
Out	Performs the zoom out operation.

Definition at line 58 of file Zoom.h.

Constructor & Destructor Documentation

te::qt::widgets::ZoomWheel::ZoomWheel	(	MapDisplay *	display,
		const double &	zoomFactor = `2.0`,
		const bool &	centralize = `true`,
		QObject *	parent = `0`
	)

It constructs a zoom wheel tool associated with the given map display.

Parameters

display	The map display associated with the tool.
zoomFactor	The factor used to zoom. i.e. A factor value of 2.0 (default) will generate a new extent twice (%) bigger or smaller.
parent	The tool's parent.

Note: The tool will NOT take the ownership of the given pointers.

Definition at line 34 of file ZoomWheel.cpp.

References ~ZoomWheel().

te::qt::widgets::ZoomWheel::~ZoomWheel ( )

default

Destructor.

Referenced by ZoomWheel().

Member Function Documentation

void Zoom::applyZoom	(	const QPointF &	point = `QPointF()`,
		bool	centralize = `true`
	)

inherited

Performs the zoom operation on map display, considering the zoom factor, zoom type and the given point.

Parameters

point	A point in world coordinates.
centralize	If the reference point is given, its possible to choose between centering this reference point or keeping it in the same position that it was.

Note: If the given point is not null, the new extent will be centered on this point. Otherwise, the current center will be kepped.

Definition at line 49 of file Zoom.cpp.

References te::gm::Envelope::getCenter(), te::map::MapDisplay::getExtent(), te::gm::Envelope::getHeight(), te::gm::Envelope::getLowerLeftX(), te::gm::Envelope::getLowerLeftY(), te::gm::Envelope::getWidth(), te::qt::widgets::Zoom::In, te::gm::Envelope::init(), te::gm::Envelope::isValid(), te::qt::widgets::AbstractTool::m_display, te::qt::widgets::Zoom::m_zoomFactor, te::qt::widgets::Zoom::m_zoomType, te::qt::widgets::MapDisplay::setExtent(), te::gm::Coord2D::x, and te::gm::Coord2D::y.

Referenced by te::qt::widgets::ZoomKeyboard::eventFilter(), eventFilter(), and te::qt::widgets::ZoomClick::mousePressEvent().

bool te::qt::widgets::ZoomWheel::eventFilter	(	QObject *	watched,
		QEvent *	e
	)

virtual

Filters events if this object has been installed as an event filter for the watched object.

Parameters

watched	The watched object.
event	The last event sent to watched object.

Note: In your reimplementation of this function, if you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.; Here, the default implementation looks for QMouseEvents and call the pure virutal methods defined on AbstractTool class, e.g. mousePressEvent().

Reimplemented from te::qt::widgets::AbstractTool.

Definition at line 42 of file ZoomWheel.cpp.

References te::qt::widgets::Zoom::applyZoom(), te::qt::widgets::AbstractTool::eventFilter(), te::qt::widgets::MapDisplay::getDraftPixmap(), te::qt::widgets::Zoom::In, m_centralize, te::qt::widgets::AbstractTool::m_display, te::qt::widgets::Zoom::Out, te::qt::widgets::Zoom::setZoomType(), and te::qt::widgets::MapDisplay::transform().

bool te::qt::widgets::AbstractTool::keyPressEvent ( QKeyEvent * e )

virtualinherited

This event handler can be reimplemented in a concrete tool class to receive key press events for the watched object.

Parameters

e	The key event.

Returns: If you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.

Reimplemented in te::qt::widgets::Measure.

Definition at line 101 of file AbstractTool.cpp.

Referenced by te::qt::widgets::AbstractTool::eventFilter().

bool te::qt::widgets::AbstractTool::mouseDoubleClickEvent ( QMouseEvent * e )

virtualinherited

This event handler can be reimplemented in a concrete tool class to receive mouse double click events for the watched object.

Parameters

e	The mouse event.

Returns: If you want to filter the event out, i.e. stop it being handled further, return true; otherwise return false.

Note: The AbstractTool will also receive mouse press and mouse release events in addition to the double click event. It is up to the developer to ensure that the application interprets these events correctly.

Reimplemented in te::edit::VertexTool, te::qt::widgets::Measure, te::edit::SplitPolygonTool, te::edit::CreatePolygonTool, te::edit::CreateLineTool, te::edit::CreatePointTool, te::qt::widgets::PolygonAcquire, te::edit::AggregateAreaTool, te::edit::SubtractAreaTool, and te::mnt::ProfileTools.

Definition at line 96 of file AbstractTool.cpp.

Referenced by te::qt::widgets::AbstractTool::eventFilter().

bool Zoom::mouseMoveEvent ( QMouseEvent * e )

virtualinherited

This event handler can be reimplemented in a concrete tool class to receive mouse move events for the watched object.

Parameters