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[material-ui] Take browser zoom into account when calculating scrollbar size #47408

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[material-ui] Take browser zoom into account when calculating scrollbar size #47408

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25 changes: 21 additions & 4 deletions packages/mui-utils/src/getScrollbarSize/getScrollbarSize.ts
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Original file line number Diff line number Diff line change
@@ -1,7 +1,24 @@
// A change of the browser zoom change the scrollbar size.
// Credit https://github.com/twbs/bootstrap/blob/488fd8afc535ca3a6ad4dc581f5e89217b6a36ac/js/src/util/scrollbar.js#L14-L18
// Credit https://github.com/twbs/bootstrap/blob/0907244256d923807c3a4e55f4ea606b9558d0ca/js/modal.js#L214-L221
// and https://github.com/twbs/bootstrap/blob/0907244256d923807c3a4e55f4ea606b9558d0ca/less/modals.less#L122-L128
export default function getScrollbarSize(win: Window = window): number {
// https://developer.mozilla.org/en-US/docs/Web/API/Window/innerWidth#usage_notes
const documentWidth = win.document.documentElement.clientWidth;
return win.innerWidth - documentWidth;
const scrollDiv = win.document.createElement('div');

scrollDiv.style.setProperty('position', 'absolute');
scrollDiv.style.setProperty('top', '-9999px');
scrollDiv.style.setProperty('width', '50px');
scrollDiv.style.setProperty('height', '50px');
scrollDiv.style.setProperty('overflow', 'scroll');
// Invert the zoom level to get 100% sized scrollbars for the element
scrollDiv.style.setProperty('zoom', `${1 / win.devicePixelRatio}`);

win.document.body.append(scrollDiv);

const unZoomedScrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;

win.document.body.removeChild(scrollDiv);

const zoomedScrollbarWidth = unZoomedScrollbarWidth / win.devicePixelRatio;

return zoomedScrollbarWidth;
}
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