QwtMagnifier(3)

NAME
QwtMagnifier - QwtMagnifier provides zooming, by magnifying in steps.

SYNOPSIS

#include <qwt_magnifier.h>

Inherited by QwtPlotMagnifier.

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

  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 (QWidget * parent) [explicit]

Constructor

Parameters:
    parent Widget to be magnified

  QwtMagnifier::~QwtMagnifier () [virtual]

Destructor.

Member Function Documentation

  bool QwtMagnifier::eventFilter (QObject * o, QEvent * e) [virtual]

Event filter.

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

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()

  const QWidget * QwtMagnifier::parentWidget () const

Returns:
    Parent widget, where the rescaling happens

  QWidget * QwtMagnifier::parentWidget ()

Returns:
    Parent widget, where the rescaling happens

  virtual void QwtMagnifier::rescale (double factor) [protected, pure virtual]

Rescale the parent widget

Parameters:
    factor Scale factor

Implemented in QwtPlotMagnifier.

  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()

  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()

  void QwtMagnifier::setMouseButton (int button, int buttonState = 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 (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()

  void QwtMagnifier::setWheelButtonState (int buttonState)

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 (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. The default value is 0.9.

Parameters:
    factor Wheel factor

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

  void QwtMagnifier::setZoomInKey (int key, int modifiers)

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 (int key, int modifiers)

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 * ke) [protected, virtual]

Handle a key press event for the observed widget.

Parameters:
    ke Key event

See also:
    eventFilter(), widgetKeyReleaseEvent()

  void QwtMagnifier::widgetKeyReleaseEvent (QKeyEvent *) [protected, virtual]

Handle a key release event for the observed widget.

Parameters:
    ke Key event

See also:
    eventFilter(), widgetKeyReleaseEvent()

  void QwtMagnifier::widgetMouseMoveEvent (QMouseEvent * me) [protected, virtual]

Handle a mouse move event for the observed widget.

Parameters:
    me Mouse event

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

  void QwtMagnifier::widgetMousePressEvent (QMouseEvent * me) [protected, virtual]

Handle a mouse press event for the observed widget.

Parameters:
    me Mouse event

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

  void QwtMagnifier::widgetMouseReleaseEvent (QMouseEvent *) [protected, virtual]

Handle a mouse release event for the observed widget.

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

  void QwtMagnifier::widgetWheelEvent (QWheelEvent * we) [protected, virtual]

Handle a wheel event for the observed widget.

Parameters:
    we Wheel event

See also:
    eventFilter()

Author

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