From fcf154eb2ae88dcf1003ea6bd14c91cab1a616e9 Mon Sep 17 00:00:00 2001
From: Roy Ben-Shabat <Roy@Twine-s.com>
Date: Sun, 24 Nov 2019 17:31:30 +0200
Subject: Backup Manager.

---
 .../Navigation/DefaultNavigationManager.cs         | 56 +++++++++++++++++-----
 1 file changed, 43 insertions(+), 13 deletions(-)

(limited to 'Software/Visual_Studio/PPC/Tango.PPC.UI/Navigation')

diff --git a/Software/Visual_Studio/PPC/Tango.PPC.UI/Navigation/DefaultNavigationManager.cs b/Software/Visual_Studio/PPC/Tango.PPC.UI/Navigation/DefaultNavigationManager.cs
index a0338912f..77b09f638 100644
--- a/Software/Visual_Studio/PPC/Tango.PPC.UI/Navigation/DefaultNavigationManager.cs
+++ b/Software/Visual_Studio/PPC/Tango.PPC.UI/Navigation/DefaultNavigationManager.cs
@@ -113,7 +113,27 @@ namespace Tango.PPC.UI.Navigation
             {
 
                 LogManager.Log($"Navigating to: {view.ToString()}...");
-                MainView.Instance.NavigationControl.NavigateTo(view.ToString());
+
+                var fromView = MainView.Instance.NavigationControl.SelectedElement;
+                FrameworkElement toView = null;
+
+                toView = MainView.Instance.NavigationControl.NavigateTo(view.ToString(),() => 
+                {
+                    var fromVM = toView.DataContext as PPCViewModel;
+
+                    if (fromVM != null)
+                    {
+                        fromVM.OnNavigatedFrom();
+                    }
+
+                    var toVM = toView.DataContext as PPCViewModel;
+
+                    if (toVM != null)
+                    {
+                        toVM.OnNavigatedTo();
+                    }
+                });
+
                 return Task.FromResult(true);
             }
         }
@@ -398,24 +418,34 @@ namespace Tango.PPC.UI.Navigation
 
             _navigating_back = true;
 
-            String first = _navigationHistory.Pop();
-            _preventHistory = true;
-
-
-            if (await NavigateTo(first))
+            if (_navigationHistory.Count > 0)
             {
-                RaisePropertyChanged(nameof(CanNavigateBack));
-                _preventHistory = false;
-                _navigating_back = false;
-                return true;
+                String first = _navigationHistory.Pop();
+                _preventHistory = true;
+
+                if (await NavigateTo(first))
+                {
+                    RaisePropertyChanged(nameof(CanNavigateBack));
+                    _preventHistory = false;
+                    _navigating_back = false;
+                    return true;
+                }
+                else
+                {
+                    _navigationHistory.Push(first);
+                    _preventHistory = false;
+                    _navigating_back = false;
+                    RaisePropertyChanged(nameof(CanNavigateBack));
+                    return false;
+                }
             }
             else
             {
-                _navigationHistory.Push(first);
+                await NavigateTo(NavigationView.HomeModule);
+                RaisePropertyChanged(nameof(CanNavigateBack));
                 _preventHistory = false;
                 _navigating_back = false;
-                RaisePropertyChanged(nameof(CanNavigateBack));
-                return false;
+                return true;
             }
         }
 
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