SubmitWidget isDisabled if not valid

[ScandyMark]

This is likely a problem with my understanding rather than program, but at a loss, so I'll make an issue. Sorry if overlooking the obvious.

Ultimate Goal: have the SubmitWidget isDisabled tied to !isValid. I don't want to have the submit button enabled unless values of TextInputWidget(s) are valid.

Disclosure: new to react, could be totally mistaken. Believe I need something like "isDisabled={this.state.foobar}" in SubmitWidget to have it change appearance when input changes.

So either use state (of ancestor), or have passed in something as dependent upon state in through prop of SubmitWidget.

Realize I can do something onSubmit checking isValid, but from the UX point of view, would prefer not to have a button that can be hit only to say don't hit button yet.

Don't see obvious, not hiding in validator way, calling callback (or whatever) to set state in TextInputWidget

[ScandyMark]

Big thanks to Daniel!

[danielweinmann]

o/

[FaridSafi]

Code example: https://github.com/FaridSafi/react-native-gifted-form/pull/17