Drop guides are added to a Java layout manager to receive parts for a layout. When a drop guide is empty and able to receive a part, passing a cursor over the drop guide will cause it to be highlighted. Drop guides may be added in positions before, after, over and below any part for greater flexibility...http://www.google.fr/patents/US5909214?utm_source=gb-gplus-shareBrevet US5909214 - Method and system for drop guides for visual layout in Java layout managers
Method and system for drop guides for visual layout in Java layout managers