@Override protected boolean _mouseEnteredDrawable(Drawable drawable){
  Diagram diag=tab.getDiagram();
  if (diag != null && diag.getStateForDrawable(drawable) != null) {
    return true;
  }
  return false;
}

@ Override protected boolean _mouseEnteredDrawable ( Drawable drawable ) { Diagram diag = tab . getDiagram ( ) ; if ( diag != null && diag . getStateForDrawable ( drawable ) != null ) { return true ; } return false ; }
returns true if and only if the given drawable instance is associated by the most recently used diagram with a diagramdataprovider state , id est a position in the text area .
