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Added step option #78

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Added step option #78

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4 changes: 2 additions & 2 deletions src/easing.js
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Original file line number Diff line number Diff line change
Expand Up @@ -5,9 +5,9 @@

const easeInOutQuad = (t, b, c, d) => {
t /= d / 2
if (t < 1) return c / 2 * t * t + b
if (t < 1) return (c / 2) * t * t + b
t--
return -c / 2 * (t * (t - 2) - 1) + b
return (-c / 2) * (t * (t - 2) - 1) + b
}

export default easeInOutQuad
7 changes: 7 additions & 0 deletions src/jump.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,7 @@ const jumper = () => {
let next // next scroll position (px)

let callback // to call when done scrolling (function)
let step // to call when finish an step (function)

// scroll position helper

Expand All @@ -46,6 +47,11 @@ const jumper = () => {
// determine time spent scrolling so far
timeElapsed = timeCurrent - timeStart

if (step) {
stop = start + step()
distance = stop - start + offset
}

// calculate next scroll position
next = easing(timeElapsed, start, distance, duration)

Expand Down Expand Up @@ -91,6 +97,7 @@ const jumper = () => {
callback = options.callback // "undefined" is a suitable default, and won't be called
easing = options.easing || easeInOutQuad
a11y = options.a11y || false
step = options.step || null

// cache starting position
start = location()
Expand Down