Qwt User's Guide: QwtMagnifier Class Reference

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QwtMagnifier Class Reference

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

#include <qwt_magnifier.h>

Inheritance diagram for QwtMagnifier:
[legend]

List of all members.

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()
Generated on Wed Sep 2 18:37:24 2009 for Qwt User's Guide by  doxygen 1.6.1
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