pinafore/routes/_utils/getRectFromEntry.js
2018-02-08 22:29:29 -08:00

19 lines
785 B
JavaScript

// Get the bounding client rect from an IntersectionObserver entry.
// This is to work around a bug in Chrome: https://crbug.com/737228
let hasBoundingRectBug
export function getRectFromEntry (entry) {
if (typeof hasBoundingRectBug !== 'boolean') {
const boundingRect = entry.target.getBoundingClientRect()
const observerRect = entry.boundingClientRect
hasBoundingRectBug = boundingRect.height !== observerRect.height ||
boundingRect.top !== observerRect.top ||
boundingRect.width !== observerRect.width ||
boundingRect.bottom !== observerRect.bottom ||
boundingRect.left !== observerRect.left ||
boundingRect.right !== observerRect.right
}
return hasBoundingRectBug ? entry.target.getBoundingClientRect() : entry.boundingClientRect
}