VLEX/BPM-UI/node_modules/ngx-bootstrap/positioning/esm5/utils/findCommonOffsetParent.js

/**
 * @fileoverview added by tsickle
 * @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
 */
/**
 * Finds the offset parent common to the two provided nodes
 */
import { isOffsetContainer } from './isOffsetContainer';
import { getRoot } from './getRoot';
import { getOffsetParent } from './getOffsetParent';
/**
 * @param {?} element1
 * @param {?} element2
 * @return {?}
 */
export 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
    /* tslint:disable-next-line: no-bitwise */
    /** @type {?} */
    var order = element1.compareDocumentPosition(element2) & Node.DOCUMENT_POSITION_FOLLOWING;
    /** @type {?} */
    var start = order ? element1 : element2;
    /** @type {?} */
    var end = order ? element2 : element1;
    // Get common ancestor container
    /** @type {?} */
    var range = document.createRange();
    range.setStart(start, 0);
    range.setEnd(end, 0);
    var commonAncestorContainer = range.commonAncestorContainer;
    // 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
    /** @type {?} */
    var element1root = getRoot(element1);
    if (element1root.host) {
        return findCommonOffsetParent(element1root.host, element2);
    }
    else {
        return findCommonOffsetParent(element1, getRoot(element2).host);
    }
}
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