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SewerStammGen.WPF/ViewModel/MainWindowViewModel.cs

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+using SewerStammGen.WPF.Commands;
+using SewerStammGen.Enum;
+using SewerStammGen.WPF.Interface;
+using SewerStammGen.WPF.Interface.Navigator;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Input;
+using SewerStammGen.WPF.ViewModel.State;
+
+namespace SewerStammGen.WPF.ViewModel
+{
+    public class MainWindowViewModel : BaseViewModel
+    {
+        public IMainWindowNavigator Navigator { get; set; }
+        public string? Projektnummer { get; set; }
+        private readonly IActualState _actualState;
+        public BaseViewModel CurrentViewModel => Navigator.CurrentViewModel;
+
+        public ICommand UpdateCurrentViewModelCommand { get; }
+
+        public static string ApplicationTitle
+        {
+            get => "Stammdatengenerator Version 0.1";
+        }
+
+        public MainWindowViewModel(
+            IMainWindowNavigator navigator,
+            IViewModelAbstractFactory viewModelFactory,
+            IActualState actualState
+            
+            )
+        {
+            Navigator = navigator;
+
+            UpdateCurrentViewModelCommand = new UpdateCurrentViewModelCommand(navigator, viewModelFactory);
+            UpdateCurrentViewModelCommand.Execute(EMainWindowViewType.Home);
+
+            _actualState = actualState;
+
+            _actualState.ProjektChanged += ActualState_ProjektChanged;
+
+
+            Navigator.StateChanged += Navigator_StateChanged;
+
+
+
+#if DEBUG
+            _actualState.ProjektID = 5;
+#endif
+        }
+
+        private void ActualState_ProjektChanged(object? sender, EventArgs e)
+        {
+            Projektnummer = _actualState.ProjektID.ToString();
+            OnPropertyChanged(nameof(Projektnummer));
+        }
+
+        private void Navigator_StateChanged()
+        {
+            OnPropertyChanged(nameof(CurrentViewModel));
+        }
+    }
+}