Feature Request: ViewModelFactory Create() method should be able to return interface to ViewModel it creates

[thomasclaudiushuber]

Feature Request: ViewModelFactory Create() method should be able to return interface to ViewModel it creates

[thomasclaudiushuber]

Hi @Daimonion1980 , thank you for this proposal. Makes fully sense. I will look into this and definitely provide a solution for this, so that you can test this scenario very well. I might split this request up into two parts:

1. Allow to specify the return value of the factory's Create method
2. Support generation of a ViewModel interface (I actually like your [ViewModelGenerateInterface] suggestion)

Timeframe will be more like end of March. Hope this works for you.

[Daimonion1980]

Awesome. Thank you for your efforts.

Two parts was the intended way i was thinking about this problem.

[thomasclaudiushuber]

Feature implemented and merged into main branch. Will be part of the next MvvmGen release (Will come out soon, end of March 2023). When the new ViewModelGenerateInterface attribute is set, an interface will be generated and the generate ViewModel implements it. If the ViewModelGenerateFactory attribute is set as well, the interface will automatically be used in the factory as a return type.

The simple ViewModel below shows this:

[ViewModelGenerateInterface]
[ViewModelGenerateFactory]
[ViewModel]
public partial class EmployeeViewModel
{
}

By setting the new attribute like above, an interface will be generated and it will be automatically used for the factory. Generated code for the class above is this:

partial class EmployeeViewModel : global::MvvmGen.ViewModels.ViewModelBase, IEmployeeViewModel
{
    public EmployeeViewModel()
    {
        this.OnInitialize();
    }
    partial void OnInitialize();
}

public interface IEmployeeViewModel
{
}

public interface IEmployeeViewModelFactory : IViewModelFactory<IEmployeeViewModel> {{ }}

public class EmployeeViewModelFactory : IEmployeeViewModelFactory
{
    public EmployeeViewModelFactory()
    {
    }

    public IEmployeeViewModel Create() => new EmployeeViewModel();
}

The ViewModelGenerateFactory attribute has now also a new ReturnType property so support even more flexibility:

Thank you @Daimonion1980