63 lines
1.6 KiB
TypeScript
63 lines
1.6 KiB
TypeScript
/* eslint-disable no-param-reassign */
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let cached: number;
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export default function getScrollBarSize(fresh?: boolean) {
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if (typeof document === 'undefined') {
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return 0;
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}
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if (fresh || cached === undefined) {
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const inner = document.createElement('div');
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inner.style.width = '100%';
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inner.style.height = '200px';
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const outer = document.createElement('div');
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const outerStyle = outer.style;
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outerStyle.position = 'absolute';
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outerStyle.top = '0';
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outerStyle.left = '0';
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outerStyle.pointerEvents = 'none';
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outerStyle.visibility = 'hidden';
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outerStyle.width = '200px';
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outerStyle.height = '150px';
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outerStyle.overflow = 'hidden';
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outer.appendChild(inner);
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document.body.appendChild(outer);
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const widthContained = inner.offsetWidth;
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outer.style.overflow = 'scroll';
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let widthScroll = inner.offsetWidth;
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if (widthContained === widthScroll) {
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widthScroll = outer.clientWidth;
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}
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document.body.removeChild(outer);
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cached = widthContained - widthScroll;
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}
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return cached;
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}
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function ensureSize(str: string) {
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const match = str.match(/^(.*)px$/);
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const value = Number(match?.[1]);
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return Number.isNaN(value) ? getScrollBarSize() : value;
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}
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export function getTargetScrollBarSize(target: HTMLElement) {
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if (typeof document === 'undefined' || !target || !(target instanceof Element)) {
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return { width: 0, height: 0 };
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}
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const { width, height } = getComputedStyle(target, '::-webkit-scrollbar');
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return {
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width: ensureSize(width),
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height: ensureSize(height),
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};
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}
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