# Class BasicScrollPaneUI.MouseWheelHandler

java.lang.Object
javax.swing.plaf.basic.BasicScrollPaneUI.MouseWheelHandler

All Implemented Interfaces:
  `MouseWheelListener`, `EventListener`

Enclosing class:
  `BasicScrollPaneUI`

protected class BasicScrollPaneUI.MouseWheelHandler extends Object implements MouseWheelListener
MouseWheelHandler is an inner class which implements the MouseWheelListener interface. MouseWheelHandler responds to MouseWheelEvents by scrolling the JScrollPane appropriately. If the scroll pane's `isWheelScrollingEnabled` method returns false, no scrolling occurs.

Since:
  1.4
See Also:
  - `JScrollPane.isWheelScrollingEnabled()`
  - `BasicScrollPaneUI.createMouseWheelListener()`
  - `MouseWheelListener`
  - `MouseWheelEvent`

- ## Constructor Summary

  Constructors
  Modifier
  Constructor
  Description
  `protected`
  `MouseWheelHandler()`
  Constructs a `MouseWheelHandler`.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `void`
  `mouseWheelMoved(MouseWheelEvent e)`
  Called when the mouse wheel is rotated while over a JScrollPane.

  ### Methods declared in class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- ## Constructor Details

  - ### MouseWheelHandler

    protected MouseWheelHandler()
    Constructs a `MouseWheelHandler`.

- ## Method Details

  - ### mouseWheelMoved

    public void mouseWheelMoved(MouseWheelEvent e)
    Called when the mouse wheel is rotated while over a JScrollPane.
    Specified by:
      `mouseWheelMoved` in interface `MouseWheelListener`
    Parameters:
      `e` - MouseWheelEvent to be handled
    Since:
      1.4
    See Also:
      - `MouseWheelEvent`