Create JavaScript callback in GWT using JSInterop

hi

In JavaScript, in order to get the login status using the Facebook SDK, one has to call the FB.getLoginStatus like so:

FB.getLoginStatus(function(response) {    if (response.status === 'connected')        // DO SOMETHING        });

notice the function(response) { ... } that is passed as a parameter to getLoginStatus.

I am able to map the FB object in GWT with the proper JSMethods like so:

@JsType(isNative = true)

public static interface FB {

  void init(FBParamObj fbParamObj);

  void getLoginStatus(CustomCallbackFunction callbackFunction);

}

However, I'm not sure how to define the CustomCallbackFunction callbackFunction that I need to provide as a parameter to FB.getLoginStatus. FB.getLoginStatus is provided by the Facebook SDK so I can not change it. 

How do I create this JavaScript callback function in GWT so I can pass it to the FB SDK as a parameter? 

I'm sure I'm missing something very basic but I can't seem to find it in the documentation. 

Thank you for the help!

Tony

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