1 files changed, 91 insertions, 0 deletions
diff --git a/Software/Visual_Studio/PPC/Tango.PPC.UI/ViewModels/BackupRestoreViewVM.cs b/Software/Visual_Studio/PPC/Tango.PPC.UI/ViewModels/BackupRestoreViewVM.cs
new file mode 100644
index 000000000..416ece24b
--- /dev/null
+++ b/Software/Visual_Studio/PPC/Tango.PPC.UI/ViewModels/BackupRestoreViewVM.cs
@@ -0,0 +1,91 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using Tango.Core.Commands;
+using Tango.Core.DI;
+using Tango.PPC.Common;
+using Tango.PPC.Common.BackupRestore;
+using Tango.PPC.UI.ViewsContracts;
+
+namespace Tango.PPC.UI.ViewModels
+{
+    public class BackupRestoreViewVM : PPCViewModel<IBackupRestoreView>
+    {
+        private Stack<BackupRestoreView> _navigation_history;
+        private BackupRestoreView _currentView;
+        private bool _canNavigateBack;
+
+        public enum BackupRestoreView
+        {
+            MainView,
+            BackupView,
+            RestoreView
+        }
+
+        [TangoInject]
+        public IBackupManager BackupManager { get; set; }
+
+        public RelayCommand<String> NavigateCommand { get; set; }
+
+        public RelayCommand NavigateBackCommand { get; set; }
+
+        public BackupRestoreViewVM()
+        {
+            NavigateCommand = new RelayCommand<string>(HandleNavigateCommand);
+            NavigateBackCommand = new RelayCommand(NavigateBack, () => _canNavigateBack);
+
+            _navigation_history = new Stack<BackupRestoreView>();
+            _canNavigateBack = true;
+        }
+
+        public override void OnNavigatedTo()
+        {
+            base.OnNavigatedTo();
+
+            _navigation_history = new Stack<BackupRestoreView>();
+            _currentView = BackupRestoreView.MainView;
+        }
+
+        private void HandleNavigateCommand(string view)
+        {
+            var v = (BackupRestoreView)Enum.Parse(typeof(BackupRestoreView), view);
+            NavigateTo(v);
+        }
+
+        private Task NavigateTo(BackupRestoreView view, bool pushHistory = true)
+        {
+            if (pushHistory)
+            {
+                _navigation_history.Push(_currentView);
+            }
+
+            _currentView = view;
+            return View.NavigateTo(view);
+        }
+
+        private async void NavigateBack()
+        {
+            _canNavigateBack = false;
+            InvalidateRelayCommands();
+
+            if (_navigation_history.Count > 0)
+            {
+                await NavigateTo(_navigation_history.Pop(), false);
+            }
+            else
+            {
+                await NavigationManager.NavigateBack();
+            }
+
+            _canNavigateBack = true;
+            InvalidateRelayCommands();
+        }
+
+        public override void OnApplicationStarted()
+        {
+
+        }
+    }
+}