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