Using bloc/rxdart(combineLatest) how can I use a checkbox?

[Tililweet]

So I want to use this in a page:

Checkbox(

                     activeColor: Color(0xFF4A41AE),

                     value:false ,

                     onChanged: ( bool value) {

                       

                      },

                   )

 Im using rxdart and I have this in my bloc :

Stream<bool> get signUpInfoValid => Rx.combineLatest(fullNm, userNm, emailAd,

     password, (fullNm, userNm, emailAd, password) => true);

I want to add the check value in there so that the button that calls signupInfoValid will be enabled when the streams are true. I know blocs work with streams so I'm stuck on how to use it. Any would help would be helpful.