53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
/*
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* Copyright (c) 2010-2018 Tim Düsterhus.
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*
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* Use of this software is governed by the Business Source License
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* included in the LICENSE file.
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*
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* Change Date: 2024-11-01
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*
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* On the date above, in accordance with the Business Source
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* License, use of this software will be governed by version 2
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* or later of the General Public License.
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*/
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define([], function () {
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'use strict'
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const DEPENDENCIES = ['UiMessageStream']
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class ReadMarker {
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constructor(messageStream) {
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this.messageStream = messageStream
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}
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bootstrap() {
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document.addEventListener(
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'visibilitychange',
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this.onVisibilitychange.bind(this)
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)
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}
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onVisibilitychange() {
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if (document.hidden) {
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const ul = elBySel('ul', this.messageStream.stream)
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let lc = ul.lastElementChild
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// delete previous markers
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Array.prototype.forEach.call(
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document.querySelectorAll('.readMarker'),
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(marker) => {
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marker.classList.remove('readMarker')
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}
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)
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if (lc) {
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lc.classList.add('readMarker')
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}
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}
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}
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}
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ReadMarker.DEPENDENCIES = DEPENDENCIES
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return ReadMarker
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})
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