1 files changed, 45 insertions, 0 deletions
diff --git a/comm/mail/components/AppIdleManager.jsm b/comm/mail/components/AppIdleManager.jsm
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index 0000000000..cc42c23178
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+++ b/comm/mail/components/AppIdleManager.jsm
@@ -0,0 +1,45 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+const EXPORTED_SYMBOLS = ["appIdleManager"];
+
+// This module provides a mechanism to turn window focus and blur events
+// into app idle notifications. If we get a blur notification that is not
+// followed by a focus notification in less than some small number of seconds,
+// then we send a begin app idle notification.
+// If we get a focus event, and we're app idle, then we send an end app idle
+// notification.
+// The notification topic is "mail:appIdle", the values are "idle", and "back"
+
+var appIdleManager = {
+  _appIdle: false,
+  _timerInterval: 5000, // 5 seconds ought to be plenty
+  get _timer() {
+    delete this._timer;
+    return (this._timer = Cc["@mozilla.org/timer;1"].createInstance(
+      Ci.nsITimer
+    ));
+  },
+
+  _timerCallback() {
+    appIdleManager._appIdle = true;
+    Services.obs.notifyObservers(null, "mail:appIdle", "idle");
+  },
+
+  onBlur() {
+    appIdleManager._timer.initWithCallback(
+      appIdleManager._timerCallback,
+      appIdleManager._timerInterval,
+      Ci.nsITimer.TYPE_ONE_SHOT
+    );
+  },
+
+  onFocus() {
+    appIdleManager._timer.cancel();
+    if (appIdleManager._appIdle) {
+      appIdleManager._appIdle = false;
+      Services.obs.notifyObservers(null, "mail:appIdle", "back");
+    }
+  },
+};