31 lines
1.1 KiB
TypeScript
31 lines
1.1 KiB
TypeScript
const easingOutQuint = (x: number, t: number, b: number, c: number, d: number) => c * ((t = t / d - 1) * t * t * t * t + 1) + b;
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const scroll = (node: Element, key: 'scrollTop' | 'scrollLeft', target: number) => {
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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 = 'scrollBehavior' in document.documentElement.style;
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export const scrollRight = (node: Element, position: number) => isScrollBehaviorSupported ? node.scrollTo({ left: position, behavior: 'smooth' }) : scroll(node, 'scrollLeft', position);
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export const scrollTop = (node: Element) => isScrollBehaviorSupported ? node.scrollTo({ top: 0, behavior: 'smooth' }) : scroll(node, 'scrollTop', 0);
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