YouTubeViewers/YouTubeViewers.WPF/ViewModels/MainViewModel.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using YouTubeViewers.WPF.Stores;

namespace YouTubeViewers.WPF.ViewModels
{
    public class MainViewModel : ViewModelBase
    {
        private readonly ModalNavigationStore _modalNavigationStore;

        public ViewModelBase CurrentModalViewModel => _modalNavigationStore.CurrentViewModel;
        public bool IsModalOpen => _modalNavigationStore.IsOpen;
        public YouTubeViewersViewModel YouTubeViewersViewModel { get; }        
        
        public MainViewModel(ModalNavigationStore modalNavigationStore, YouTubeViewersViewModel youTubeViewersViewModel)
        {
            _modalNavigationStore = modalNavigationStore;
            YouTubeViewersViewModel = youTubeViewersViewModel;

            _modalNavigationStore.CurrentViewModelChanged += ModalNavigationStore_CurrenyViewModelChanged;
        }

        protected override void Dispose()
        {
            _modalNavigationStore.CurrentViewModelChanged -= ModalNavigationStore_CurrenyViewModelChanged;
            base.Dispose();
        }

        private void ModalNavigationStore_CurrenyViewModelChanged()
        {
            OnPropertyChanged(nameof(CurrentModalViewModel));
            OnPropertyChanged(nameof(IsModalOpen));
        }
    }
}