From afc7a07d285e08d905c58dd5978441c155b2f296 Mon Sep 17 00:00:00 2001
From: Roy Ben-Shabat <Roy@Twine-s.com>
Date: Tue, 19 Dec 2017 10:25:40 +0200
Subject: MERGE.

---
 Software/Visual_Studio/Tango.SharedUI/ViewModel.cs | 57 ++++++++++++++++++++--
 1 file changed, 54 insertions(+), 3 deletions(-)

(limited to 'Software/Visual_Studio/Tango.SharedUI/ViewModel.cs')

diff --git a/Software/Visual_Studio/Tango.SharedUI/ViewModel.cs b/Software/Visual_Studio/Tango.SharedUI/ViewModel.cs
index 281a6c03d..0dac0ce48 100644
--- a/Software/Visual_Studio/Tango.SharedUI/ViewModel.cs
+++ b/Software/Visual_Studio/Tango.SharedUI/ViewModel.cs
@@ -1,6 +1,10 @@
 using System;
+using System.Collections;
 using System.Collections.Generic;
+using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
 using System.Linq;
+using System.Reflection;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
@@ -8,9 +12,56 @@ using Tango.Core;
 
 namespace Tango.SharedUI
 {
-    public abstract class ViewModel : ExtendedObject
+    public abstract class ViewModel : ExtendedObject, INotifyDataErrorInfo
     {
+        private List<KeyValuePair<String, String>> _currentErrors = new List<KeyValuePair<string, string>>();
 
+        private bool _hasErrors;
+        public bool HasErrors
+        {
+            get { return _hasErrors; }
+            set { _hasErrors = value; RaisePropertyChangedAuto(); }
+        }
+
+        public event EventHandler<DataErrorsChangedEventArgs> ErrorsChanged;
+
+        public virtual IEnumerable GetErrors(string propertyName)
+        {
+            return _currentErrors.Where(x => x.Key == propertyName).Select(x => x.Value).ToList();
+        }
+
+        protected void RaiseError(String propName)
+        {
+            ErrorsChanged?.Invoke(this, new DataErrorsChangedEventArgs(propName));
+        }
+
+        protected bool Validate()
+        {
+            OnValidating();
+
+            HasErrors = false;
+            _currentErrors.Clear();
+
+            foreach (var prop in this.GetType().GetProperties(BindingFlags.Public | BindingFlags.Instance))
+            {
+                foreach (var validation in prop.GetCustomAttributes<ValidationAttribute>())
+                {
+                    if (!validation.IsValid(prop.GetValue(this)))
+                    {
+                        HasErrors = true;
+                        _currentErrors.Add(new KeyValuePair<string, string>(prop.Name, validation.ErrorMessage));
+                        RaiseError(prop.Name);
+                    }
+                }
+            }
+
+            return !HasErrors;
+        }
+
+        protected virtual void OnValidating()
+        {
+            
+        }
     }
 
     public abstract class ViewModel<T> : ViewModel where T : IView
@@ -29,13 +80,13 @@ namespace Tango.SharedUI
 
         public ViewModel(T view, bool delayed)
         {
-            Task.Factory.StartNew(() => 
+            Task.Factory.StartNew(() =>
             {
                 while (view == null)
                 {
                     Thread.Sleep(10);
                 }
-            }).ContinueWith((c) => 
+            }).ContinueWith((c) =>
             {
                 View = view;
                 View.ViewAttached += (x, e) =>
-- 
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