Source generators

[ThatRendle]

Is your feature request related to a problem? Please describe.

PropertyChanged and Commands required a lot of verbose, repetitive boilerplate code.

Describe the solution you'd like

Source generators could generate properties and commands from fields and methods, applying best practices along the way.

Describe suggestions on how to achieve the feature

I'm using some very basic source generators in an Avalonia UI project at the moment, for example the Command generator can only handle parameterless methods right now, but it's a start.

I copied the implementations to a gist: https://gist.github.com/markrendle/93ccfb62f2e2f87137148b9aaa57f02f

public partial class LoginViewModel : ViewModelBase
{
    [ReactiveProperty] private string? _userName; // Generates UserName property
    [ReactiveProperty] private string? _password; // Generates Password property
    [ReactiveProperty] private bool _loggingIn; // Generates LoggingIn property

    [ReactiveCommand] // Generates LoginCommand command using CanLogin as canExecute
    private void Login()
    {
        LoggingIn = true;
        _userManager.Login(UserName, Password);
    }

    private bool CanLogin() => !LoggingIn && UserName is { Length: > 0 } && Password is { Length: > 0 };
}

Additional context

Obviously this is inspired by https://github.com/CommunityToolkit/dotnet/tree/main/src/CommunityToolkit.Mvvm.SourceGenerators

[ChrisPulman]

@markrendle please see our Source Generators, if you need anything further please raise your request in the source generators repository. https://www.nuget.org/packages/ReactiveUI.SourceGenerators

ReactiveUI.SourceGenerators 1.0.3

A MVVM framework that integrates with the Reactive Extensions for .NET to create elegant, testable User Interfaces that run on any mobile or desktop platform. This is the Source Generators package for ReactiveUI

[ChrisPulman]

You can find out how to use the Source Generators here: https://www.reactiveui.net/docs/handbook/view-models/boilerplate-code.html

The manual way to create properties in ReactiveUI | An advanced, composable, reactive model-view-viewmodel framework

[ChrisPulman]

Closing this as the requested feature already exists

[github-actions[bot]]

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