An object which allows the addition and removal of listeners for a Chrome event.

class ChromeEvent extends ChromeObject {
 ChromeEvent();
 ChromeEvent.fromProxy(JsObject jsProxy): super.fromProxy(jsProxy);

 /**
  * Registers an event listener _callback_ to an event.
  */
 Future addListener() {
   var completer = new ChromeCompleter.noArgs();
   jsProxy.callMethod('addListener', [completer.callback]);
   return completer.future;
 }

 /**
  * Deregisters an event listener _callback_ from an event.
  */
 Future removeListener() {
   var completer = new ChromeCompleter.noArgs();
   jsProxy.callMethod('removeListener', [completer.callback]);
   return completer.future;
 }

 bool hasListener(dynamic callback) {
   return jsProxy.callMethod('hasListener', [jsify(callback)]);
 }

 bool hasListeners() {
   return jsProxy.callMethod('hasListeners');
 }

 /**
  * Registers rules to handle events.
  * 
  * [eventName] Name of the event this function affects.
  * 
  * [rules] Rules to be registered. These do not replace previously registered
  * rules.
  * 
  * Returns:
  * Rules that were registered, the optional parameters are filled with values.
  */
 Future<List<Rule>> addRules(String eventName, List<Rule> rules) {
   var completer = new ChromeCompleter<List<Rule>>.oneArg((e) => listify(e, _createRule));
   jsProxy.callMethod('addRules', [eventName, jsify(rules), completer.callback]);
   return completer.future;
 }

 /**
  * Returns currently registered rules.
  * 
  * [eventName] Name of the event this function affects.
  * 
  * [ruleIdentifiers] If an array is passed, only rules with identifiers
  * contained in this array are returned.
  * 
  * Returns:
  * Rules that were registered, the optional parameters are filled with values.
  */
 Future<List<Rule>> getRules(String eventName, [List<String> ruleIdentifiers]) {
   var completer = new ChromeCompleter<List<Rule>>.oneArg((e) => listify(e, _createRule));
   jsProxy.callMethod('getRules', [eventName, jsify(ruleIdentifiers), completer.callback]);
   return completer.future;
 }

 /**
  * Unregisters currently registered rules.
  * 
  * [eventName] Name of the event this function affects.
  * 
  * [ruleIdentifiers] If an array is passed, only rules with identifiers
  * contained in this array are unregistered.
  */
 Future removeRules(String eventName, [List<String> ruleIdentifiers]) {
   var completer = new ChromeCompleter.noArgs();
   jsProxy.callMethod('removeRules', [eventName, jsify(ruleIdentifiers), completer.callback]);
   return completer.future;
 }
}