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import { createElement, removeElement } from './dom-manip'
// Logic for determining if, when the element is right-to-left, the scrollbar appears on the left side
let isRtlScrollbarOnLeft: boolean | null = null
export function getIsRtlScrollbarOnLeft() { // responsible for caching the computation
if (isRtlScrollbarOnLeft === null) {
isRtlScrollbarOnLeft = computeIsRtlScrollbarOnLeft()
}
return isRtlScrollbarOnLeft
}
function computeIsRtlScrollbarOnLeft() { // creates an offscreen test element, then removes it
let outerEl = createElement('div', {
style: {
position: 'absolute',
top: -1000,
left: 0,
border: 0,
padding: 0,
overflow: 'scroll',
direction: 'rtl'
}
}, '<div></div>')
document.body.appendChild(outerEl)
let innerEl = outerEl.firstChild as HTMLElement
let res = innerEl.getBoundingClientRect().left > outerEl.getBoundingClientRect().left
removeElement(outerEl)
return res
}
// The scrollbar width computations in computeEdges are sometimes flawed when it comes to
// retina displays, rounding, and IE11. Massage them into a usable value.
export function sanitizeScrollbarWidth(width: number) {
width = Math.max(0, width) // no negatives
width = Math.round(width)
return width
}