File size: 1,681 Bytes
e4a10af |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 |
import isOffsetContainer from './isOffsetContainer';
import getRoot from './getRoot';
import getOffsetParent from './getOffsetParent';
/**
* Finds the offset parent common to the two provided nodes
* @method
* @memberof Popper.Utils
* @argument {Element} element1
* @argument {Element} element2
* @returns {Element} common offset parent
*/
export default function findCommonOffsetParent(element1, element2) {
// This check is needed to avoid errors in case one of the elements isn't defined for any reason
if (!element1 || !element1.nodeType || !element2 || !element2.nodeType) {
return document.documentElement;
}
// Here we make sure to give as "start" the element that comes first in the DOM
const order =
element1.compareDocumentPosition(element2) &
Node.DOCUMENT_POSITION_FOLLOWING;
const start = order ? element1 : element2;
const end = order ? element2 : element1;
// Get common ancestor container
const range = document.createRange();
range.setStart(start, 0);
range.setEnd(end, 0);
const { commonAncestorContainer } = range;
// Both nodes are inside #document
if (
(element1 !== commonAncestorContainer &&
element2 !== commonAncestorContainer) ||
start.contains(end)
) {
if (isOffsetContainer(commonAncestorContainer)) {
return commonAncestorContainer;
}
return getOffsetParent(commonAncestorContainer);
}
// one of the nodes is inside shadowDOM, find which one
const element1root = getRoot(element1);
if (element1root.host) {
return findCommonOffsetParent(element1root.host, element2);
} else {
return findCommonOffsetParent(element1, getRoot(element2).host);
}
}
|