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1/*
2 * Copyright 2020 Adobe. All rights reserved.
3 * This file is licensed to you under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License. You may obtain a copy
5 * of the License at http://www.apache.org/licenses/LICENSE-2.0
6 *
7 * Unless required by applicable law or agreed to in writing, software distributed under
8 * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR REPRESENTATIONS
9 * OF ANY KIND, either express or implied. See the License for the specific language
10 * governing permissions and limitations under the License.
11 */
12
13export function getScrollParent(node: Element): Element {
14 if (isScrollable(node)) {
15 node = node.parentElement;
16 }
17
18 while (node && !isScrollable(node)) {
19 node = node.parentElement;
20 }
21
22 return node || document.scrollingElement || document.documentElement;
23}
24
25export function isScrollable(node: Element): boolean {
26 let style = window.getComputedStyle(node);
27 return /(auto|scroll)/.test(style.overflow + style.overflowX + style.overflowY);
28}