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SeekButton.ts
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SeekButton.ts
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import * as shadyCss from '@webcomponents/shadycss';
import { Button, buttonTemplate } from './Button';
import type { ChromelessPlayer } from 'theoplayer/chromeless';
import seekButtonCss from './SeekButton.css';
import seekForwardIcon from '../icons/seek-forward.svg';
import { StateReceiverMixin } from './StateReceiverMixin';
import { Attribute } from '../util/Attribute';
import { setTextContent } from '../util/CommonUtils';
import { createTemplate } from '../util/TemplateUtils';
const template = createTemplate(
'theoplayer-seek-button',
buttonTemplate(`<span part="icon"><slot name="icon">${seekForwardIcon}</slot></span>` + `<span part="offset"></span>`, seekButtonCss)
);
const DEFAULT_SEEK_OFFSET = 10;
/**
* `<theoplayer-seek-button>` - A button that seeks forward or backward by a fixed offset.
*
* @attribute `seek-offset` - The offset (in seconds) by which to seek forward (if positive) or backward (if negative).
* @group Components
*/
export class SeekButton extends StateReceiverMixin(Button, ['player']) {
static get observedAttributes() {
return [...Button.observedAttributes, Attribute.SEEK_OFFSET];
}
private _player: ChromelessPlayer | undefined;
private _offsetEl: HTMLElement;
constructor() {
super({ template: template() });
this._offsetEl = this.shadowRoot!.querySelector('[part="offset"]')!;
this._upgradeProperty('player');
this._upgradeProperty('seekOffset');
}
override connectedCallback() {
super.connectedCallback();
this._updateAriaLabel();
}
/**
* The offset (in seconds) by which to seek forward (if positive) or backward (if negative).
*/
get seekOffset(): number {
return Number(this.getAttribute(Attribute.SEEK_OFFSET) ?? DEFAULT_SEEK_OFFSET);
}
set seekOffset(value: number) {
this.setAttribute(Attribute.SEEK_OFFSET, String(value));
}
get player(): ChromelessPlayer | undefined {
return this._player;
}
set player(player: ChromelessPlayer | undefined) {
this._player = player;
}
protected override handleClick() {
if (this._player === undefined) {
return;
}
const duration = this._player.duration;
if (isNaN(duration)) {
return;
}
this._player.currentTime = Math.max(0, Math.min(duration, this._player.currentTime + this.seekOffset));
}
override attributeChangedCallback(attrName: string, oldValue: any, newValue: any) {
super.attributeChangedCallback(attrName, oldValue, newValue);
if (newValue === oldValue) {
return;
}
if (attrName === Attribute.SEEK_OFFSET) {
setTextContent(this._offsetEl, String(Math.abs(this.seekOffset)));
}
if (SeekButton.observedAttributes.indexOf(attrName as Attribute) >= 0) {
shadyCss.styleSubtree(this);
this._updateAriaLabel();
}
}
private _updateAriaLabel(): void {
const seekOffset = this.seekOffset;
const label = seekOffset >= 0 ? `seek forward by ${seekOffset} seconds` : `seek backward by ${-seekOffset} seconds`;
this.setAttribute(Attribute.ARIA_LABEL, label);
}
}
customElements.define('theoplayer-seek-button', SeekButton);
declare global {
interface HTMLElementTagNameMap {
'theoplayer-seek-button': SeekButton;
}
}