QwtMagnifier Class Reference

QwtMagnifier provides zooming, by magnifying in steps. More...

#include <qwt_magnifier.h>

Inheritance diagram for QwtMagnifier:

Public Member Functions
	QwtMagnifier (QWidget *)
virtual	~QwtMagnifier ()
	Destructor.
QWidget *	parentWidget ()
const QWidget *	parentWidget () const
void	setEnabled (bool)
	En/disable the magnifier. More...
bool	isEnabled () const
void	setMouseFactor (double)
	Change the mouse factor. More...
double	mouseFactor () const
void	setMouseButton (Qt::MouseButton, Qt::KeyboardModifiers=Qt::NoModifier)
void	getMouseButton (Qt::MouseButton &, Qt::KeyboardModifiers &) const
void	setWheelFactor (double)
	Change the wheel factor. More...
double	wheelFactor () const
void	setWheelModifiers (Qt::KeyboardModifiers)
Qt::KeyboardModifiers	wheelModifiers () const
void	setKeyFactor (double)
	Change the key factor. More...
double	keyFactor () const
void	setZoomInKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
void	getZoomInKey (int &key, Qt::KeyboardModifiers &) const
	Retrieve the settings of the zoom in key. More...
void	setZoomOutKey (int key, Qt::KeyboardModifiers=Qt::NoModifier)
void	getZoomOutKey (int &key, Qt::KeyboardModifiers &) const
	Retrieve the settings of the zoom out key. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Event filter. More...

Protected Member Functions
virtual void	rescale (double factor)=0
virtual void	widgetMousePressEvent (QMouseEvent *)
virtual void	widgetMouseReleaseEvent (QMouseEvent *)
virtual void	widgetMouseMoveEvent (QMouseEvent *)
virtual void	widgetWheelEvent (QWheelEvent *)
virtual void	widgetKeyPressEvent (QKeyEvent *)
virtual void	widgetKeyReleaseEvent (QKeyEvent *)

Detailed Description

QwtMagnifier provides zooming, by magnifying in steps.

Using QwtMagnifier a plot can be zoomed in/out in steps using keys, the mouse wheel or moving a mouse button in vertical direction.

Constructor & Destructor Documentation

QwtMagnifier()

QwtMagnifier::QwtMagnifier ( QWidget *  parent )

explicit

Constructor

Parameters

parent

Widget to be magnified

Member Function Documentation

eventFilter()

bool QwtMagnifier::eventFilter ( QObject *  object, QEvent *  event  )

virtual

Event filter.

When isEnabled() is true, the mouse events of the observed widget are filtered.

Parameters

object	Object to be filtered
event	Event

Returns

Forwarded to QObject::eventFilter()

See also

widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent() widgetKeyReleaseEvent()

getMouseButton()

void QwtMagnifier::getMouseButton	(	Qt::MouseButton &	button,
		Qt::KeyboardModifiers &	modifiers
	)		const

See also

setMouseButton()

getZoomInKey()

void QwtMagnifier::getZoomInKey	(	int &	key,
		Qt::KeyboardModifiers &	modifiers
	)		const

Retrieve the settings of the zoom in key.

Parameters

key	Key code, see Qt::Key
modifiers	Keyboard modifiers

See also

setZoomInKey()

getZoomOutKey()

void QwtMagnifier::getZoomOutKey	(	int &	key,
		Qt::KeyboardModifiers &	modifiers
	)		const

Retrieve the settings of the zoom out key.

Parameters

key	Key code, see Qt::Key
modifiers	Keyboard modifiers

See also

setZoomOutKey()

isEnabled()

bool QwtMagnifier::isEnabled

(

)

const

Returns

true when enabled, false otherwise

See also

setEnabled(), eventFilter()

keyFactor()

double QwtMagnifier::keyFactor

(

)

const

Returns

Key factor

See also

setKeyFactor()

mouseFactor()

double QwtMagnifier::mouseFactor

(

)

const

Returns

Mouse factor

See also

setMouseFactor()

parentWidget() [1/2]

QWidget * QwtMagnifier::parentWidget

(

)

Returns

Parent widget, where the rescaling happens

parentWidget() [2/2]

const QWidget * QwtMagnifier::parentWidget

(

)

const

Returns

Parent widget, where the rescaling happens

rescale()

virtual void QwtMagnifier::rescale ( double  factor )

protectedpure virtual

Rescale the parent widget

Parameters

factor

Scale factor

Implemented in QwtPlotMagnifier.

setEnabled()

void QwtMagnifier::setEnabled

(

bool

on

)

En/disable the magnifier.

When enabled is true an event filter is installed for the observed widget, otherwise the event filter is removed.

Parameters

on	true or false

See also

isEnabled(), eventFilter()

setKeyFactor()

void QwtMagnifier::setKeyFactor

(

double

factor

)

Change the key factor.

The key factor defines the ratio between the current range on the parent widget and the zoomed range for each key press of the zoom in/out keys. The default value is 0.9.

Parameters

factor

Key factor

See also

keyFactor(), setZoomInKey(), setZoomOutKey(), setWheelFactor, setMouseFactor()

setMouseButton()

void QwtMagnifier::setMouseButton	(	Qt::MouseButton	button,
		Qt::KeyboardModifiers	modifiers = Qt::NoModifier
	)

Assign the mouse button, that is used for zooming in/out. The default value is Qt::RightButton.

Parameters

button	Button
modifiers	Keyboard modifiers

See also

getMouseButton()

setMouseFactor()

void QwtMagnifier::setMouseFactor

(

double

factor

)

Change the mouse factor.

The mouse factor defines the ratio between the current range on the parent widget and the zoomed range for each vertical mouse movement. The default value is 0.95.

Parameters

factor

Wheel factor

See also

mouseFactor(), setMouseButton(), setWheelFactor(), setKeyFactor()

setWheelFactor()

void QwtMagnifier::setWheelFactor

(

double

factor

)

Change the wheel factor.

The wheel factor defines the ratio between the current range on the parent widget and the zoomed range for each step of the wheel.

Use values > 1 for magnification (i.e. 2.0) and values < 1 for scaling down (i.e. 1/2.0 = 0.5). You can use this feature for inverting the direction of the wheel.

The default value is 0.9.

Parameters

factor

Wheel factor

See also

wheelFactor(), setWheelButtonState(), setMouseFactor(), setKeyFactor()

setWheelModifiers()

void QwtMagnifier::setWheelModifiers

(

Qt::KeyboardModifiers

modifiers

)

Assign keyboard modifiers for zooming in/out using the wheel. The default modifiers are Qt::NoModifiers.

Parameters

modifiers

Keyboard modifiers

See also

wheelModifiers()

setZoomInKey()

void QwtMagnifier::setZoomInKey	(	int	key,
		Qt::KeyboardModifiers	modifiers = Qt::NoModifier
	)

Assign the key, that is used for zooming in. The default combination is Qt::Key_Plus + Qt::NoModifier.

Parameters

key
modifiers

See also

getZoomInKey(), setZoomOutKey()

setZoomOutKey()

void QwtMagnifier::setZoomOutKey	(	int	key,
		Qt::KeyboardModifiers	modifiers = Qt::NoModifier
	)

Assign the key, that is used for zooming out. The default combination is Qt::Key_Minus + Qt::NoModifier.

Parameters

key
modifiers

See also

getZoomOutKey(), setZoomOutKey()

wheelFactor()

double QwtMagnifier::wheelFactor

(

)

const

Returns

Wheel factor

See also

setWheelFactor()

wheelModifiers()

Qt::KeyboardModifiers QwtMagnifier::wheelModifiers

(

)

const

Returns

Wheel modifiers

See also

setWheelModifiers()

widgetKeyPressEvent()

void QwtMagnifier::widgetKeyPressEvent ( QKeyEvent *  keyEvent )

protectedvirtual

Handle a key press event for the observed widget.

Parameters

keyEvent

Key event

See also

eventFilter(), widgetKeyReleaseEvent()

widgetKeyReleaseEvent()

void QwtMagnifier::widgetKeyReleaseEvent ( QKeyEvent *  keyEvent )

protectedvirtual

Handle a key release event for the observed widget.

Parameters

keyEvent

Key event

See also

eventFilter(), widgetKeyReleaseEvent()

widgetMouseMoveEvent()

void QwtMagnifier::widgetMouseMoveEvent ( QMouseEvent *  mouseEvent )

protectedvirtual

Handle a mouse move event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(),

widgetMousePressEvent()

void QwtMagnifier::widgetMousePressEvent ( QMouseEvent *  mouseEvent )

protectedvirtual

Handle a mouse press event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()

widgetMouseReleaseEvent()

void QwtMagnifier::widgetMouseReleaseEvent ( QMouseEvent *  mouseEvent )

protectedvirtual

Handle a mouse release event for the observed widget.

Parameters

mouseEvent

Mouse event

See also

eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),

widgetWheelEvent()

void QwtMagnifier::widgetWheelEvent ( QWheelEvent *  wheelEvent )

protectedvirtual

Handle a wheel event for the observed widget.

Parameters

wheelEvent

Wheel event

See also

eventFilter()