QwtMagnifier(3)

NAME
QwtMagnifier -

SYNOPSIS

#include <qwt_magnifier.h>

Inherited by QwtPlotMagnifier.

  Public Member Functions
QwtMagnifier (QWidget *)
virtual ~QwtMagnifier ()
virtual bool eventFilter (QObject *, QEvent *)
void getMouseButton (int &button, int &buttonState) const
void getZoomInKey (int &key, int &modifiers) const
void getZoomOutKey (int &key, int &modifiers) const
bool isEnabled () const
double keyFactor () const
double mouseFactor () const
QWidget * parentWidget ()
const QWidget * parentWidget () const
void setEnabled (bool)
void setKeyFactor (double)
void setMouseButton (int button, int buttonState=Qt::NoButton)
void setMouseFactor (double)
void setWheelButtonState (int buttonState)
void setWheelFactor (double)
void setZoomInKey (int key, int modifiers)
void setZoomOutKey (int key, int modifiers)
int wheelButtonState () const
double wheelFactor () const

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

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 (QWidget *parent) [explicit]
Constructor

Parameters:
    parent Widget to be magnified

Member Function Documentation

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

Event filter. When isEnabled() the mouse events of the observed widget are filtered.

Parameters:
    object Object to be filtered
    event Event

See also:
    widgetMousePressEvent(), widgetMouseReleaseEvent(), widgetMouseMoveEvent(), widgetWheelEvent(), widgetKeyPressEvent() widgetKeyReleaseEvent()

  void QwtMagnifier::getMouseButton (int &button, int &buttonState) const
See also:
    setMouseButton()

  void QwtMagnifier::getZoomInKey (int &key, int &modifiers) const
See also:
    setZoomInKey()

  void QwtMagnifier::getZoomOutKey (int &key, int &modifiers) const
See also:
    setZoomOutKey()

  bool QwtMagnifier::isEnabled () const
Returns:
    true when enabled, false otherwise

See also:
    setEnabled(), eventFilter()

  double QwtMagnifier::keyFactor () const
Returns:
    Key factor

See also:
    setKeyFactor()

  double QwtMagnifier::mouseFactor () const
Returns:
    Mouse factor

See also:
    setMouseFactor()

  QWidget * QwtMagnifier::parentWidget ()
Returns:
    Parent widget, where the rescaling happens

  const QWidget * QwtMagnifier::parentWidget () const
Returns:
    Parent widget, where the rescaling happens

  virtual void QwtMagnifier::rescale (doublefactor) [protected], [pure virtual]
Rescale the parent widget

Parameters:
    factor Scale factor

Implemented in QwtPlotMagnifier.

  void QwtMagnifier::setEnabled (boolon)

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()

  void QwtMagnifier::setKeyFactor (doublefactor)

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()

  void QwtMagnifier::setMouseButton (intbutton, intbuttonState = Qt::NoButton)
Assign the mouse button, that is used for zooming in/out. The default value is Qt::RightButton.

Parameters:
    button Button
    buttonState Button state

See also:
    getMouseButton()

  void QwtMagnifier::setMouseFactor (doublefactor)

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()

  void QwtMagnifier::setWheelButtonState (intbuttonState)
Assign a mandatory button state for zooming in/out using the wheel. The default button state is Qt::NoButton.

Parameters:
    buttonState Button state

See also:
    wheelButtonState()

  void QwtMagnifier::setWheelFactor (doublefactor)

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. The default value is 0.9.

Parameters:
    factor Wheel factor

See also:
    wheelFactor(), setWheelButtonState(), setMouseFactor(), setKeyFactor()

  void QwtMagnifier::setZoomInKey (intkey, intmodifiers)
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()

  void QwtMagnifier::setZoomOutKey (intkey, intmodifiers)
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()

  int QwtMagnifier::wheelButtonState () const
Returns:
    Wheel button state

See also:
    setWheelButtonState()

  double QwtMagnifier::wheelFactor () const
Returns:
    Wheel factor

See also:
    setWheelFactor()

  void QwtMagnifier::widgetKeyPressEvent (QKeyEvent *keyEvent) [protected], [virtual]
Handle a key press event for the observed widget.

Parameters:
    keyEvent Key event

See also:
    eventFilter(), widgetKeyReleaseEvent()

  void QwtMagnifier::widgetKeyReleaseEvent (QKeyEvent *keyEvent) [protected], [virtual]
Handle a key release event for the observed widget.

Parameters:
    keyEvent Key event

See also:
    eventFilter(), widgetKeyReleaseEvent()

  void QwtMagnifier::widgetMouseMoveEvent (QMouseEvent *mouseEvent) [protected], [virtual]
Handle a mouse move event for the observed widget.

Parameters:
    mouseEvent Mouse event

See also:
    eventFilter(), widgetMousePressEvent(), widgetMouseReleaseEvent(),

  void QwtMagnifier::widgetMousePressEvent (QMouseEvent *mouseEvent) [protected], [virtual]
Handle a mouse press event for the observed widget.

Parameters:
    mouseEvent Mouse event

See also:
    eventFilter(), widgetMouseReleaseEvent(), widgetMouseMoveEvent()

  void QwtMagnifier::widgetMouseReleaseEvent (QMouseEvent *mouseEvent) [protected], [virtual]
Handle a mouse release event for the observed widget.

Parameters:
    mouseEvent Mouse event

See also:
    eventFilter(), widgetMousePressEvent(), widgetMouseMoveEvent(),

  void QwtMagnifier::widgetWheelEvent (QWheelEvent *wheelEvent) [protected], [virtual]
Handle a wheel event for the observed widget.

Parameters:
    wheelEvent Wheel event

See also:
    eventFilter()

Author

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