navigation menu & design

TV Player WPF/ViewModels/MainViewModel.cs

@@ -1,4 +1,6 @@
-using System.Windows.Controls;
+using CommunityToolkit.Mvvm.Input;
+using System.Windows.Controls;
+using System.Windows.Input;
 
 namespace TV_Player
 {
@@ -11,6 +13,15 @@ namespace TV_Player
             set => SetProperty(ref _control, value);
         }
 
+        private bool _isTopPanelVisible;
+        public bool IsTopPanelVisible{
+            get => _isTopPanelVisible;
+            set => SetProperty(ref _isTopPanelVisible, value);
+        }
+
+        public Action ButtonBackAction { get; set; }
+        public ICommand BackCommand { get; }
+
         public MainViewModel()
         {
             var vm = new ProgramsGroupViewModel();
@@ -18,6 +29,12 @@ namespace TV_Player
             var control = new ProgramsGroupGrid();
             control.DataContext = vm;
             Control = control;
+
+            BackCommand = new RelayCommand(OnButtonBackClick);
+        }
+        private void OnButtonBackClick()
+        {
+            ButtonBackAction?.Invoke();
         }
     }
 }

TV Player WPF/ViewModels/PlayerViewModel.cs

@@ -23,7 +23,7 @@ namespace TV_Player
         {
             _currentProgram = selectedProgram;
             BackCommand = new RelayCommand(OnButtonBackClick);
-           
+            TVPlayerViewModel.Instance.TopPanelVisible(false);
         }
 
         private void OnButtonBackClick()

TV Player WPF/ViewModels/ProgramsGroupViewModel.cs

@@ -20,6 +20,8 @@ namespace TV_Player
         {
             ItemSelectedCommand = new RelayCommand(OnItemSelected);
             ProgramsData.Instance.GroupsInformation.Subscribe(x=>Programs = x);
+           
+            //TVPlayerViewModel.Instance.TopPanelVisible(true);
         }
 
         private void OnItemSelected()

TV Player WPF/ViewModels/ProgramsListViewModel.cs

@@ -18,8 +18,16 @@ namespace TV_Player
 
         public ProgramsListViewModel(GroupInfo groupInfo)
         {
+            TVPlayerViewModel.Instance.TopPanelVisible(true);
             ItemSelectedCommand = new RelayCommand(OnItemSelected);
-            ProgramsData.Instance.AllPrograms.Subscribe(x=>Programs = x.Where(p=>p.GroupTitle== groupInfo.Name).ToList());
+            ProgramsData.Instance.AllPrograms.Subscribe(x => Programs = x.Where(p => p.GroupTitle == groupInfo.Name).ToList());
+
+            TVPlayerViewModel.Instance.SetBackButtonAction(new Action(() =>
+            {
+                var programGroupViewModel = new ProgramsGroupViewModel();
+                var conrtrol = new ProgramsGroupGrid();
+                TVPlayerViewModel.Instance.SetPageContext(conrtrol, programGroupViewModel);
+            }));
         }
 
         private void OnItemSelected()

TV Player WPF/ViewModels/TVPlayerViewModel.cs

@@ -1,10 +1,14 @@
-using System.Windows.Controls;
+using CommunityToolkit.Mvvm.Input;
+using System.Windows.Controls;
+using System.Windows.Input;
 
 namespace TV_Player.ViewModels
 {
     public class TVPlayerViewModel
     {
         private readonly MainViewModel _mainViewModel;
+        
+        public Action ButtonBackAction { get; set; }       
 
         private static TVPlayerViewModel _instance;
         public static TVPlayerViewModel Instance
@@ -25,6 +29,16 @@ namespace TV_Player.ViewModels
             
             mainWindow.Show();
             _instance = this;
+           
+        }
+        public void TopPanelVisible(bool value)
+        {
+            _mainViewModel.IsTopPanelVisible = value;
+        }
+
+        public void SetBackButtonAction(Action action)
+        {
+            _mainViewModel.ButtonBackAction = action;
         }
 
         public void SetPageContext(ContentControl control, object viewModel)