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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,51 @@ | ||
| function easeInOutSin(time) { | ||
| return (1 + Math.sin(Math.PI * time - Math.PI / 2)) / 2; | ||
| } | ||
|
|
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| function animate(prop, element, to, options = {}, cb = () => {}) { | ||
| const { | ||
| ease = easeInOutSin, | ||
| duration = 300, // standard | ||
| } = options; | ||
|
|
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| let start = null; | ||
| const from = element[prop]; | ||
| let cancelled = false; | ||
|
|
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| const cancel = () => { | ||
| cancelled = true; | ||
| }; | ||
|
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| const step = timestamp => { | ||
| if (cancelled) { | ||
| cb(new Error('Animation cancelled')); | ||
| return; | ||
| } | ||
|
|
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| if (start === null) { | ||
| start = timestamp; | ||
| } | ||
| const time = Math.min(1, (timestamp - start) / duration); | ||
|
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| element[prop] = ease(time) * (to - from) + from; | ||
|
|
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| if (time >= 1) { | ||
| requestAnimationFrame(() => { | ||
| cb(null); | ||
| }); | ||
| return; | ||
| } | ||
|
|
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| requestAnimationFrame(step); | ||
| }; | ||
|
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| if (from === to) { | ||
| cb(new Error('Element already at target position')); | ||
| return cancel; | ||
| } | ||
|
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| requestAnimationFrame(step); | ||
| return cancel; | ||
| } | ||
|
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| export default animate; |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,49 @@ | ||
| import { assert } from 'chai'; | ||
| import animate from './animate'; | ||
|
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| describe('animate', () => { | ||
| let container; | ||
|
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| before(() => { | ||
| container = document.createElement('div'); | ||
| container.style.cssText = [ | ||
| 'height: 100px', | ||
| 'width: 100px', | ||
| 'overflow: scroll', | ||
| 'border: 1px solid #000', | ||
| ].join(';'); | ||
| const box = document.createElement('div'); | ||
| box.style.cssText = ['height: 100px', 'width: 1000px'].join(';'); | ||
| container.appendChild(box); | ||
| document.body.appendChild(container); | ||
| }); | ||
|
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| after(() => { | ||
| document.body.removeChild(container); | ||
| }); | ||
|
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| it('should work', done => { | ||
| container.scrollLeft = 200; | ||
| animate('scrollLeft', container, 300, {}, () => { | ||
| assert.strictEqual(container.scrollLeft, 300); | ||
| done(); | ||
| }); | ||
| }); | ||
|
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| it('should work when asking for the current value', done => { | ||
| container.scrollLeft = 200; | ||
| animate('scrollLeft', container, 200, {}, () => { | ||
| assert.strictEqual(container.scrollLeft, 200); | ||
| done(); | ||
| }); | ||
| }); | ||
|
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| it('should be able to cancel the animatation', done => { | ||
| container.scrollLeft = 200; | ||
| const cancel = animate('scrollLeft', container, 300, {}, () => { | ||
| assert.strictEqual(container.scrollLeft, 200); | ||
| done(); | ||
| }); | ||
| cancel(); | ||
| }); | ||
| }); |
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