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## org.eclipse.jface.text
Interface IViewportListener

public interface IViewportListener

Registered with a text viewer, view port listeners are informed about changes of a text viewer's view port. The view port is that portion of the viewer's document which is visible in the viewer.

Clients may implement this interface.

See Also:
  `ITextViewer`

Method Summary
`void` | `viewportChanged(int verticalOffset)` Informs about view port changes.

Method Detail

### viewportChanged

    public void viewportChanged(int verticalOffset)

  Informs about view port changes. The given vertical position is the new vertical scrolling offset measured in pixels.

  Parameters:
    `verticalOffset` - the vertical offset measured in pixels

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