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LanguageMenuButton.ts
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LanguageMenuButton.ts
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import { MenuButton } from './MenuButton';
import { buttonTemplate } from './Button';
import languageIcon from '../icons/language.svg';
import { StateReceiverMixin } from './StateReceiverMixin';
import type { ChromelessPlayer, MediaTrackList, TextTracksList } from 'theoplayer/chromeless';
import { isSubtitleTrack } from '../util/TrackUtils';
import { Attribute } from '../util/Attribute';
import { toggleAttribute } from '../util/CommonUtils';
import { createTemplate } from '../util/TemplateUtils';
const template = createTemplate('theoplayer-language-menu-button', buttonTemplate(`<span part="icon"><slot>${languageIcon}</slot></span>`));
const TRACK_EVENTS = ['addtrack', 'removetrack'] as const;
/**
* `<theoplayer-language-menu-button>` - A menu button that opens a {@link LanguageMenu}.
*
* When there are no alternative audio languages or subtitles, this button automatically hides itself.
*
* @attribute `menu` - The ID of the language menu.
* @group Components
*/
export class LanguageMenuButton extends StateReceiverMixin(MenuButton, ['player']) {
private _player: ChromelessPlayer | undefined;
private _audioTrackList: MediaTrackList | undefined;
private _textTrackList: TextTracksList | undefined;
constructor() {
super({ template: template() });
this._upgradeProperty('player');
}
override connectedCallback() {
super.connectedCallback();
if (!this.hasAttribute(Attribute.ARIA_LABEL)) {
this.setAttribute(Attribute.ARIA_LABEL, 'open language menu');
}
}
get player(): ChromelessPlayer | undefined {
return this._player;
}
set player(player: ChromelessPlayer | undefined) {
if (this._player === player) {
return;
}
this._audioTrackList?.removeEventListener(TRACK_EVENTS, this._updateTracks);
this._textTrackList?.removeEventListener(TRACK_EVENTS, this._updateTracks);
this._player = player;
this._audioTrackList = player?.audioTracks;
this._textTrackList = player?.textTracks;
this._updateTracks();
this._audioTrackList?.addEventListener(TRACK_EVENTS, this._updateTracks);
this._textTrackList?.addEventListener(TRACK_EVENTS, this._updateTracks);
}
private readonly _updateTracks = (): void => {
const hasTracks = this._player !== undefined && (this._player.audioTracks.length >= 2 || this._player.textTracks.some(isSubtitleTrack));
toggleAttribute(this, Attribute.HIDDEN, !hasTracks);
};
}
customElements.define('theoplayer-language-menu-button', LanguageMenuButton);
declare global {
interface HTMLElementTagNameMap {
'theoplayer-language-menu-button': LanguageMenuButton;
}
}