Source Generator for Bindable Property

[pictos]

This will be used by the lib only, it shouldn't be part of our public nuget, because of that I deleted the template...

I'll point out the code areas that, I believe, can cause questions. In the future should be easier to port the code to the public SG project and delete this one

Fixes #542

[VladislavAntonyuk]

should we add a message for NRE describing what is null?

[TheCodeTraveler]

Thanks Pedro! Just FYI - I renamed the new class and its namespace to CommunityToolkit.Maui.SourceGenerators.Internal.

This opens up the opportunity for us to use this csproj for additional internal source generators in the future.

And let's convert all of our BindablePropertys in this PR before we merge. I'm happy to help convert them all.

[TheCodeTraveler]

Hey Pedro! This is looking really really cool!

Could you add the ability to include XML comments in the attribute? Right now <inheritdoc /> is hardcoded, but many of our already-implemented properties have customized XML docs. I tried to convert a couple existing BindablePropertys, but ran into this as a blocker.

👇 Maybe it'd look something like this?

[BindableProperty<bool>("IsExpanded", PropertyChangedMethodName = nameof(OnIsExpandedPropertyChanged), XMLComment="<inheritdoc />")]

[pictos]

@brminnick I didn't have a good approach for XML docs, because they can be small or big, and not sure how that will fit with SG... Maybe let this be solved when C# has partial properties?

OF course, you may have a bunch of const string to reference, but I don't feel it very idiomatic

[VladislavAntonyuk]

@pictos do we need any unresolved issues or open questions? Can we merge this PR as it is?

[listepo]

any news?

[TheCodeTraveler]

Thanks Pedro! Thanks Vlad!