Slider: rename handlers to match dev guideline
Slider: rename handlers to match dev guideline

kitsonk/deliteful,tkrugg/deliteful,cjolif/deliteful,brunano21/deliteful,brunano21/deliteful,harbalk/deliteful,harbalk/deliteful,kitsonk/deliteful,cjolif/deliteful,tkrugg/deliteful,EAlexRojas/deliteful,EAlexRojas/deliteful