Notes/Notes.Data/ViewModels/MainViewModel.cs

using System;
using System.Diagnostics.CodeAnalysis;
using CommunityToolkit.Mvvm.ComponentModel;
using Notes.Models;
using Utils;

namespace Notes.ViewModels;

public class MainViewModelDesignData:MainViewModel
{
    public MainViewModelDesignData()
    {
        ContentViewModel = new AboutViewModel(Service);
    }
}
public partial class MainViewModel:ViewModelBase
{
    /// <summary>
    /// current viewModel
    /// </summary>
    [ObservableProperty] private ViewModelBase _contentViewModel;

    [ObservableProperty]
    private AllNotesViewModel? _allNotesViewModel;
    
    [ObservableProperty]
    private AboutViewModel? _aboutViewModel;
    [ObservableProperty]
    private NoteViewModel? _currNoteViewModel;

    [ObservableProperty]
    private IServices _service;
    
    public MainViewModel(IServices services)
    {
        _service = services;
        _service.Register(this);
        _contentViewModel =_aboutViewModel= new AboutViewModel(_service);
    }

    public MainViewModel()
    {
        
    }

    public T Navitation<T>() where T: ViewModelBase
    {
        var type = typeof(T);
        if (type == typeof(AboutViewModel))
        {
            AboutViewModel ??= new AboutViewModel(Service);
            this.ContentViewModel = AboutViewModel;
            return (T)this.ContentViewModel;
        }
        else if (type == typeof(AllNotesViewModel))
        {
            AllNotesViewModel ??= new AllNotesViewModel(Service);
            this.ContentViewModel = AllNotesViewModel;
            return (T)this.ContentViewModel;
        }
        else if (type == typeof(NoteViewModel))
        {
            AllNotesViewModel ??= new AllNotesViewModel(Service);
            CurrNoteViewModel ??= new NoteViewModel(Service,AllNotesViewModel,new Note());
            this.ContentViewModel = CurrNoteViewModel;
            return (T)this.ContentViewModel;
        }

        throw new InvalidOperationException($"{typeof(T)} is not a {nameof(ViewModelBase)}");
    }

    public void OpenNote(Note note)
    {
        AllNotesViewModel ??= new AllNotesViewModel(Service);
        CurrNoteViewModel ??= new NoteViewModel(Service,AllNotesViewModel,note);
        CurrNoteViewModel.Note = note;
        this.ContentViewModel = CurrNoteViewModel;
    }
}