DnDSupport.java 文件源码

public void register(Component c) {
    synchronized( recognizers ) {
        DragGestureRecognizer dgr = recognizers.get( c );
        if( null == dgr ) {
            dgr = dragSource.createDefaultDragGestureRecognizer(c, DnDConstants.ACTION_MOVE, this);
            recognizers.put( c, dgr );
        }
    }
}