33 lines
1.2 KiB
Text
33 lines
1.2 KiB
Text
// @flow
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import getScrollParent from './getScrollParent';
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import getParentNode from './getParentNode';
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import getWindow from './getWindow';
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import type { Window, VisualViewport } from '../types';
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import isScrollParent from './isScrollParent';
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/*
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given a DOM element, return the list of all scroll parents, up the list of ancesors
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until we get to the top window object. This list is what we attach scroll listeners
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to, because if any of these parent elements scroll, we'll need to re-calculate the
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reference element's position.
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*/
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export default function listScrollParents(
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element: Node,
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list: Array<Element | Window> = []
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): Array<Element | Window | VisualViewport> {
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const scrollParent = getScrollParent(element);
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const isBody = scrollParent === element.ownerDocument?.body;
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const win = getWindow(scrollParent);
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const target = isBody
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? [win].concat(
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win.visualViewport || [],
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isScrollParent(scrollParent) ? scrollParent : []
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)
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: scrollParent;
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const updatedList = list.concat(target);
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return isBody
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? updatedList
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: // $FlowFixMe[incompatible-call]: isBody tells us target will be an HTMLElement here
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updatedList.concat(listScrollParents(getParentNode(target)));
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}
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