class ChromeScriptBadge extends ChromeApi {
 static final JsObject _scriptBadge = chrome['scriptBadge'];

 ChromeScriptBadge._();

 bool get available => _scriptBadge != null;

 /**
  * Sets the html document to be opened as a popup when the user clicks on the
  * script badge's icon.
  */
 void setPopup(ScriptBadgeSetPopupParams details) {
   if (_scriptBadge == null) _throwNotAvailable();

   _scriptBadge.callMethod('setPopup', [jsify(details)]);
 }

 /**
  * Gets the html document set as the popup for this script badge.
  */
 Future<String> getPopup(ScriptBadgeGetPopupParams details) {
   if (_scriptBadge == null) _throwNotAvailable();

   var completer = new ChromeCompleter<String>.oneArg();
   _scriptBadge.callMethod('getPopup', [jsify(details), completer.callback]);
   return completer.future;
 }

 /**
  * Brings the script badge to the attention of the user, imploring her to
  * click.  You should call this when you detect that you can do something to a
  * particular tab.  Do not call this for every tab. That's tacky.  If the user
  * clicks on the badge, the activeTab APIs become available. If the extension
  * has already run on this tab, this call does nothing.
  */
 void getAttention(ScriptBadgeGetAttentionParams details) {
   if (_scriptBadge == null) _throwNotAvailable();

   _scriptBadge.callMethod('getAttention', [jsify(details)]);
 }

 /**
  * Fired when a script badge icon is clicked.  This event will not fire if the
  * script badge has a popup.
  */
 Stream<Tab> get onClicked => _onClicked.stream;

 final ChromeStreamController<Tab> _onClicked =
     new ChromeStreamController<Tab>.oneArg(_scriptBadge, 'onClicked', _createTab);

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