This listener receives continuous horizontal scrolling events independent of the finger count.
onScroll(float displacement, float delta, float velocity)
public abstract boolean onScroll (float displacement, float delta, float velocity)
Called while the user is scrolling after initial horizontal scroll.
|displacement||distance between current event and first down event x value|
|delta||delta between two consecutive x motion events|
|velocity||velocity of current x motion event|
trueif the events were handled