| /** |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| let cached: number | undefined; |
| |
| const css = (x: TemplateStringsArray) => x.join('\n'); |
| |
| export default function getScrollBarSize(forceRefresh = false) { |
| if (typeof document === 'undefined') { |
| return 0; |
| } |
| if (cached === undefined || forceRefresh) { |
| const inner = document.createElement('div'); |
| const outer = document.createElement('div'); |
| inner.style.cssText = css` |
| width: auto; |
| height: 100%; |
| overflow: scroll; |
| `; |
| outer.style.cssText = css` |
| position: absolute; |
| visibility: hidden; |
| overflow: hidden; |
| width: 100px; |
| height: 50px; |
| `; |
| outer.append(inner); |
| document.body.append(outer); |
| cached = outer.clientWidth - inner.clientWidth; |
| outer.remove(); |
| } |
| return cached; |
| } |