Support all base value accessors

[Airblader]

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The missing ones are currently:

• [x] NumberValueAccessor (can just exend the default accessor and override the change function)
• [x] RangeValueAccessor (can just extend the default accessor and override the writeValue function)
• [x] CheckboxValueAccessor
• [ ] RadioControlValueAccessor
• [x] SelectMultipleControlValueAccessor (only meaningful once #5 is implemented)

The radio one is a bit tricky since here we will have multiple form controls with the same queryParamName. This means we need to properly support using the same name on multiple controls.

(Edit: which should now work)

[Airblader]

https://github.com/MrWolfZ/ngrx-forms/tree/master/src/view-adapter also implements custom accessors and is a good reference, though we mostly align with angular's implementation.

[verfault]

Greetings!

Are Radios still unsupported?

[Airblader]

At the moment, yes, though of course this can be implemented outside of ngqp as well. I would think for the most part and implementation like Angular's can be more or less copied, change the selector for it and it should (hopefully) work.

[Airblader]

A workaround is also to use a regular FormControl for the radio and manually wire it up with ngqp.

[Airblader]

Oh, also note this only affects "vanilla" HTML radio buttons. If you're using some component library like Material, it'll already have a ControlValueAccessor and should work fine.