Rename IdleListener to IdleDetector

js/modules/idle_detector.js

@@ -0,0 +1,39 @@
+const desktopIdle = require('desktop-idle');
+const EventEmitter = require('events');
+
+
+const POLL_INTERVAL = 10; // seconds
+const IDLE_THRESHOLD = POLL_INTERVAL;
+
+class IdleDetector extends EventEmitter {
+  constructor() {
+    super();
+    this.intervalId = null;
+  }
+
+  start() {
+    this.stop();
+    this.intervalId = setInterval(() => {
+      const idleDurationInSeconds = desktopIdle.getIdleTime();
+      const isIdle = idleDurationInSeconds >= IDLE_THRESHOLD;
+      if (!isIdle) {
+        return;
+      }
+
+      this.emit('idle', { idleDurationInSeconds });
+
+    }, POLL_INTERVAL * 1000);
+  }
+
+  stop() {
+    if (!this.intervalId) {
+      return;
+    }
+
+    clearInterval(this.intervalId);
+  }
+}
+
+module.exports = {
+  IdleDetector,
+};