The MouseWheelEvent class encapsulates a mouse wheel event.........
The MouseWheelEvent Class:
The MouseWheelEvent class encapsulates a mouse wheel event. It is a subclass of MouseEvent. Not all mice have wheels. If a mouse has a wheel, it is located between the left and right buttons. Mouse wheels are used for scrolling.
MouseWheelEvent :- integer constants:
- WHEEL_BLOCK_SCROLL : A page-up or page-down scroll event occurred.
- WHEEL_UNIT_SCROLL : A line-up or line-down scroll event occurred.
