class ChromeIdle extends ChromeApi {
 static final JsObject _idle = chrome['idle'];

 ChromeIdle._();

 bool get available => _idle != null;

 /**
  * Returns "locked" if the system is locked, "idle" if the user has not
  * generated any input for a specified number of seconds, or "active"
  * otherwise.
  * 
  * [detectionIntervalInSeconds] The system is considered idle if
  * detectionIntervalInSeconds seconds have elapsed since the last user input
  * detected.
  * 
  * Returns:
  * enum of `active`, `idle`, `locked`
  */
 Future<String> queryState(int detectionIntervalInSeconds) {
   if (_idle == null) _throwNotAvailable();

   var completer = new ChromeCompleter<String>.oneArg();
   _idle.callMethod('queryState', [detectionIntervalInSeconds, completer.callback]);
   return completer.future;
 }

 /**
  * Sets the interval, in seconds, used to determine when the system is in an
  * idle state for onStateChanged events. The default interval is 60 seconds.
  * 
  * [intervalInSeconds] Threshold, in seconds, used to determine when the
  * system is in an idle state.
  */
 void setDetectionInterval(int intervalInSeconds) {
   if (_idle == null) _throwNotAvailable();

   _idle.callMethod('setDetectionInterval', [intervalInSeconds]);
 }

 /**
  * Fired when the system changes to an active, idle or locked state. The event
  * fires with "locked" if the screen is locked or the screensaver activates,
  * "idle" if the system is unlocked and the user has not generated any input
  * for a specified number of seconds, and "active" when the user generates
  * input on an idle system.
  */
 Stream<String> get onStateChanged => _onStateChanged.stream;

 final ChromeStreamController<String> _onStateChanged =
     new ChromeStreamController<String>.oneArg(_idle, 'onStateChanged', selfConverter);

 void _throwNotAvailable() {
   throw new UnsupportedError("'chrome.idle' is not available");
 }
}