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