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+/* -*- Mode: IDL; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ *
+ * 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/. */
+
+#include "nsISupports.idl"
+interface nsIObserver;
+
+/**
+ * This interface lets you monitor how long the user has been 'idle',
+ * i.e. not used their mouse or keyboard. You can get the idle time directly,
+ * but in most cases you will want to register an observer for a predefined
+ * interval. The observer will get an 'idle' notification when the user is idle
+ * for that interval (or longer), and receive an 'active' notification when the
+ * user starts using their computer again.
+ */
+
+[scriptable, uuid(cc52f19a-63ae-4a1c-9cc3-e79eace0b471)]
+interface nsIIdleService : nsISupports
+{
+ /**
+ * The amount of time in milliseconds that has passed
+ * since the last user activity.
+ *
+ * If we do not have a valid idle time to report, 0 is returned
+ * (this can happen if the user never interacted with the browser
+ * at all, and if we are also unable to poll for idle time manually).
+ */
+ readonly attribute unsigned long idleTime;
+
+ /**
+ * Add an observer to be notified when the user idles for some period of
+ * time, and when they get back from that.
+ *
+ * @param observer the observer to be notified
+ * @param time the amount of time in seconds the user should be idle before
+ * the observer should be notified.
+ *
+ * @note
+ * The subject of the notification the observer will get is always the
+ * nsIIdleService itself.
+ * When the user goes idle, the observer topic is "idle" and when he gets
+ * back, the observer topic is "active".
+ * The data param for the notification contains the current user idle time.
+ *
+ * @note
+ * You can add the same observer twice.
+ * @note
+ * Most implementations need to poll the OS for idle info themselves,
+ * meaning your notifications could arrive with a delay up to the length
+ * of the polling interval in that implementation.
+ * Current implementations use a delay of 5 seconds.
+ */
+ void addIdleObserver(in nsIObserver observer, in unsigned long time);
+
+ /**
+ * Remove an observer registered with addIdleObserver.
+ * @param observer the observer that needs to be removed.
+ * @param time the amount of time they were listening for.
+ * @note
+ * Removing an observer will remove it once, for the idle time you specify.
+ * If you have added an observer multiple times, you will need to remove it
+ * just as many times.
+ */
+ void removeIdleObserver(in nsIObserver observer, in unsigned long time);
+};
+
+%{C++
+ /**
+ * Observer topic notification for idle window: OBSERVER_TOPIC_IDLE.
+ * Observer topic notification for active window: OBSERVER_TOPIC_ACTIVE.
+ */
+
+ #define OBSERVER_TOPIC_IDLE "idle"
+ #define OBSERVER_TOPIC_ACTIVE "active"
+ #define OBSERVER_TOPIC_IDLE_DAILY "idle-daily"
+%}