QWheelEvent Class Reference
[QtGui module]

QWheelEvent::QWheelEvent ( const QPoint & pos, int delta, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, Qt::Orientation orient = Qt::Vertical )

Constructs a wheel event object.

The position, pos, is the location of the mouse cursor within the widget. The globalPos() is initialized to QCursor::pos() which is usually, but not always, correct. Use the other constructor if you need to specify the global position explicitly.

The buttons describe the state of the mouse buttons at the time of the event, delta contains the rotation distance, modifiers holds the keyboard modifier flags at the time of the event, and orient holds the wheel's orientation.

See also pos(), delta(), and state().

QWheelEvent::QWheelEvent ( const QPoint & pos, const QPoint & globalPos, int delta, Qt::MouseButtons buttons, Qt::KeyboardModifiers modifiers, Qt::Orientation orient = Qt::Vertical )

Constructs a wheel event object.

The pos provides the location of the mouse cursor within the widget. The position in global coordinates is specified by globalPos. delta contains the rotation distance, modifiers holds the keyboard modifier flags at the time of the event, and orient holds the wheel's orientation.

See also pos(), globalPos(), delta(), and state().

 void MyWidget::wheelEvent(QWheelEvent *event)
 {
     int numDegrees = event->delta() / 8;
     int numSteps = numDegrees / 15;

     if (event->orientation() == Qt::Horizontal) {
         scrollHorizontally(numSteps);
     } else {
         scrollVertically(numSteps);
     }
     event->accept();
 }