private ViewportLayer viewportLayer;
@Before
public void before() {
dataLayer = new DataLayerFixture(20, 20, 100, 40);
hideShowLayer = new ColumnHideShowLayer(dataLayer);
viewportLayer = new ViewportLayer(hideShowLayer);
viewportLayer.setClientAreaProvider(new IClientAreaProvider() {
public Rectangle getClientArea() {
return new Rectangle(0, 0, 800, 400);