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rOACCT/node_modules/@popperjs/core/lib/dom-utils/getCompositeRect.js.flow
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getCompositeRect.js.flow
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// @flow
import type { Rect, VirtualElement, Window } from '../types';
import getBoundingClientRect from './getBoundingClientRect';
import getNodeScroll from './getNodeScroll';
import getNodeName from './getNodeName';
import { isHTMLElement } from './instanceOf';
import getWindowScrollBarX from './getWindowScrollBarX';
import getDocumentElement from './getDocumentElement';
import isScrollParent from './isScrollParent';
import { round } from '../utils/math';
function isElementScaled(element: HTMLElement) {
const rect = element.getBoundingClientRect();
const scaleX = round(rect.width) / element.offsetWidth || 1;
const scaleY = round(rect.height) / element.offsetHeight || 1;
return scaleX !== 1 || scaleY !== 1;
}
// Returns the composite rect of an element relative to its offsetParent.
// Composite means it takes into account transforms as well as layout.
export default function getCompositeRect(
elementOrVirtualElement: Element | VirtualElement,
offsetParent: Element | Window,
isFixed: boolean = false
): Rect {
const isOffsetParentAnElement = isHTMLElement(offsetParent);
const offsetParentIsScaled =
isHTMLElement(offsetParent) && isElementScaled(offsetParent);
const documentElement = getDocumentElement(offsetParent);
const rect = getBoundingClientRect(
elementOrVirtualElement,
offsetParentIsScaled,
isFixed
);
let scroll = { scrollLeft: 0, scrollTop: 0 };
let offsets = { x: 0, y: 0 };
if (isOffsetParentAnElement || (!isOffsetParentAnElement && !isFixed)) {
if (
getNodeName(offsetParent) !== 'body' ||
// https://github.com/popperjs/popper-core/issues/1078
isScrollParent(documentElement)
) {
scroll = getNodeScroll(offsetParent);
}
if (isHTMLElement(offsetParent)) {
offsets = getBoundingClientRect(offsetParent, true);
offsets.x += offsetParent.clientLeft;
offsets.y += offsetParent.clientTop;
} else if (documentElement) {
offsets.x = getWindowScrollBarX(documentElement);
}
}
return {
x: rect.left + scroll.scrollLeft - offsets.x,
y: rect.top + scroll.scrollTop - offsets.y,
width: rect.width,
height: rect.height,
};
}
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