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22 lines
800 B
JavaScript
22 lines
800 B
JavaScript
export default function scroll (t, { speed = 120, smooth = 10 } = {}) {
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let moving = false
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let pos = 0
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let scrollTop = 0
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t.addEventListener('wheel', e => {
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e.preventDefault()
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pos = Math.max(0, Math.min(pos - Math.max(-1, Math.min(1, (e.delta || e.wheelDelta) ?? -e.detail)) * speed, (t.scrollHeight - t.clientHeight) + (smooth * 2)))
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if (!moving) update()
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}, { capture: true, passive: false })
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// TODO: this needs to be the scrollend event once we update electron
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t.addEventListener('pointerup', () => { pos = scrollTop = t.scrollTop })
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function update () {
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const delta = pos - scrollTop === smooth * 2 ? 0 : ((pos - scrollTop) / smooth)
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scrollTop += delta
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t.scrollTo(0, scrollTop)
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moving = Math.abs(delta) > 0.5 && requestAnimationFrame(update)
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}
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}
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