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Switch to using requestIdleCallback

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Example:
https://developer.mozilla.org/en-US/docs/Web/API/Background_Tasks_API#Example
This commit is contained in:
Daniel Gasienica 2018-03-21 15:45:39 -04:00
parent d13668544d
commit 09ee2d4ea2
1 changed files with 25 additions and 18 deletions
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43
js/modules/idle_detector.js
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@ -1,36 +1,43 @@
const desktopIdle = require('desktop-idle'); /* eslint-env browser */
const EventEmitter = require('events'); const EventEmitter = require('events');
const POLL_INTERVAL = 10; // seconds const POLL_INTERVAL_MS = 10 * 1000;
const IDLE_THRESHOLD = POLL_INTERVAL; const IDLE_THRESHOLD_MS = 25;
class IdleDetector extends EventEmitter { class IdleDetector extends EventEmitter {
constructor() { constructor() {
super(); super();
this.intervalId = null; this.handle = null;
this.timeoutId = null;
} }
start() { start() {
this.stop(); this._scheduleNextCallback();
this.intervalId = setInterval(() => {
const idleDurationInSeconds = desktopIdle.getIdleTime();
const isIdle = idleDurationInSeconds >= IDLE_THRESHOLD;
if (!isIdle) {
return;
}
this.emit('idle', { idleDurationInSeconds });
}, POLL_INTERVAL * 1000);
} }
stop() { stop() {
if (!this.intervalId) { if (this.handle) {
return; cancelIdleCallback(this.handle);
} }
clearInterval(this.intervalId); if (this.timeoutId) {
clearTimeout(this.timeoutId);
}
}
_scheduleNextCallback() {
this.stop();
this.handle = requestIdleCallback((deadline) => {
const { didTimeout } = deadline;
const timeRemaining = deadline.timeRemaining();
const isIdle = timeRemaining >= IDLE_THRESHOLD_MS;
if (isIdle || didTimeout) {
this.emit('idle', { timestamp: Date.now(), didTimeout, timeRemaining });
}
this.timeoutId = setTimeout(() => this._scheduleNextCallback(), POLL_INTERVAL_MS);
});
} }
} }