ProcessRendererDropTarget.java 文件源码

@Override
public void dragEnter(final DropTargetDragEvent e) {
    super.dragEnter(e);
    if (dropTragetListenerList != null) {
        Object[] listeners = dropTragetListenerList.getListenerList();
        for (int i = listeners.length - 2; i >= 0; i -= 2) {
            if (listeners[i] == DropTargetListener.class) {
                ((DropTargetListener) listeners[i + 1]).dragEnter(e);
            }
        }
    }
}