question: public T reverse ( ) { String id = getId ( ) ; String REVERSE = "_REVERSE" ; if ( id . endsWith ( REVERSE ) ) { setId ( id . substring ( 0 , id . length ( ) - REVERSE . length ( ) ) ) ; } float start = mStart ; float end = mEnd ; mStart = end ; mEnd = start ; mReverse = ! mReverse ; return self ( ) ; }
target:  Reverse how the transition is applied, such that the transition previously performed when progress=start of range is only performed when progress=end of range