mirror of https://github.com/mastodon/mastodon
49 lines
1.1 KiB
TypeScript
49 lines
1.1 KiB
TypeScript
const easingOutQuint = (
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x: number,
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t: number,
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b: number,
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c: number,
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d: number
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) => c * ((t = t / d - 1) * t * t * t * t + 1) + b;
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const scroll = (
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node: Element,
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key: 'scrollTop' | 'scrollLeft',
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target: number
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) => {
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const startTime = Date.now();
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const offset = node[key];
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const gap = target - offset;
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const duration = 1000;
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let interrupt = false;
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const step = () => {
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const elapsed = Date.now() - startTime;
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const percentage = elapsed / duration;
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if (percentage > 1 || interrupt) {
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return;
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}
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node[key] = easingOutQuint(0, elapsed, offset, gap, duration);
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requestAnimationFrame(step);
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};
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step();
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return () => {
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interrupt = true;
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};
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};
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const isScrollBehaviorSupported =
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'scrollBehavior' in document.documentElement.style;
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export const scrollRight = (node: Element, position: number) =>
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isScrollBehaviorSupported
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? node.scrollTo({ left: position, behavior: 'smooth' })
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: scroll(node, 'scrollLeft', position);
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export const scrollTop = (node: Element) =>
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isScrollBehaviorSupported
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? node.scrollTo({ top: 0, behavior: 'smooth' })
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: scroll(node, 'scrollTop', 0);
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