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Emit enabled, released, and error events from NoSleepNative #1

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Emit enabled, released, and error events from NoSleepNative #1

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30 changes: 26 additions & 4 deletions lib/main.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -5,9 +5,27 @@ export interface INoSleep {
enable(): Promise<void>;
disable(): void;
dispose(): void;
on(event: 'enabled' | 'released' | 'error', listener: Function): void;
}

class NoSleepSSR implements INoSleep {
class EventEmitter {
private events: { [event: string]: Function[] } = {};

on(event: string, listener: Function) {
if (!this.events[event]) {
this.events[event] = [];
}
this.events[event].push(listener);
}

emit(event: string, ...args: any[]) {
if (this.events[event]) {
this.events[event].forEach((listener) => listener(...args));
}
}
}

class NoSleepSSR extends EventEmitter implements INoSleep {
isEnabled = false;
enable(): Promise<void> {
throw new Error('NoSleep using SSR/no-op mode; do not call enable.');
Expand All @@ -17,12 +35,12 @@ class NoSleepSSR implements INoSleep {
}
dispose() {}
}

class NoSleepNative implements INoSleep {
class NoSleepNative extends EventEmitter implements INoSleep {
isEnabled = false;
wakeLock?: WakeLockSentinel;

constructor() {
super();
this.handleVisibilityChange = this.handleVisibilityChange.bind(this);
document.addEventListener('visibilitychange', this.handleVisibilityChange);
document.addEventListener('fullscreenchange', this.handleVisibilityChange);
Expand All @@ -36,15 +54,18 @@ class NoSleepNative implements INoSleep {
try {
this.wakeLock = await navigator.wakeLock.request('screen');
this.isEnabled = true;
this.emit('enabled');
console.debug('Wake Lock active.');
this.wakeLock.addEventListener('release', () => {
// TODO: Potentially emit an event for the page to observe since
// Wake Lock releases happen when page visibility changes.
// (https://web.dev/wakelock/#wake-lock-lifecycle)
this.emit('released');
console.debug('Wake Lock released.');
});
} catch (err) {
this.isEnabled = false;
this.emit('error', err);
if (err instanceof Error) console.error(`${err.name}, ${err.message}`);
}
}
Expand Down Expand Up @@ -76,7 +97,7 @@ class NoSleepNative implements INoSleep {
}
}

class NoSleepVideo implements INoSleep {
class NoSleepVideo extends EventEmitter implements INoSleep {
isEnabled = false;
noSleepVideo: HTMLVideoElement;
onLogEvent?: LogEventCallback;
Expand All @@ -86,6 +107,7 @@ class NoSleepVideo implements INoSleep {
videoSourceType?: 'webm' | 'mp4';
onLogEvent?: LogEventCallback;
}) {
super();
// Set up no sleep video element
this.noSleepVideo = document.createElement('video');
this.onLogEvent = options?.onLogEvent;
Expand Down