wehub-resource-sync
fdedcf53bb
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36 lines
1.1 KiB
TypeScript
36 lines
1.1 KiB
TypeScript
/*---------------------------------------------------------------------------------------------
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* Copyright (c) Microsoft Corporation. All rights reserved.
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* Licensed under the MIT License. See License.txt in the project root for license information.
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*--------------------------------------------------------------------------------------------*/
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import { getElementsForSourceLine } from './scroll-sync';
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export class ActiveLineMarker {
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private _current: any;
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onDidChangeTextEditorSelection(line: number, documentVersion: number) {
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const { previous } = getElementsForSourceLine(line, documentVersion);
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this._update(previous && (previous.codeElement || previous.element));
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}
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private _update(before: HTMLElement | undefined) {
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this._unmarkActiveElement(this._current);
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this._markActiveElement(before);
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this._current = before;
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}
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private _unmarkActiveElement(element: HTMLElement | undefined) {
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if (!element) {
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return;
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}
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element.classList.toggle('code-active-line', false);
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}
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private _markActiveElement(element: HTMLElement | undefined) {
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if (!element) {
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return;
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}
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element.classList.toggle('code-active-line', true);
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}
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}
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