PaletteTreeViewer.java 文件源码

/**
 * @see org.eclipse.gef.EditPartViewer#findObjectAtExcluding(Point, Collection, EditPartViewer.Conditional)
 */
@Override
public EditPart findObjectAtExcluding(Point pt, Collection exclude, Conditional condition) {
  if (getControl() == null)
    return null;

  final Tree tree = getTreeControl();
  Rectangle area = tree.getClientArea();
  if (pt.x < area.x || pt.y < area.y || pt.x >= area.x + area.width || pt.y >= area.y + area.height)
    return null;

  EditPart result = null;
  TreeItem tie = tree.getItem(new org.eclipse.swt.graphics.Point(pt.x, pt.y));

  if (tie != null) {
    result = (EditPart) tie.getData();
  } else if (tree.getData() instanceof EditPart) {
    result = (EditPart) tree.getData();
  }
  while (result != null) {
    if ((condition == null || condition.evaluate(result)) && !exclude.contains(result))
      return result;
    result = result.getParent();
  }
  return null;
}