From 43976e1268727009edc63f0b53fdb81c78b6f345 Mon Sep 17 00:00:00 2001
From: Imad Rahmouni <rahmounimad@gmail.com>
Date: Sun, 6 Mar 2016 21:26:53 +0100
Subject: [PATCH] Homework 2 done Implement IPropertyChangedNotifier for
 DataManger class

---
 RestaurantManager.Models/DataManager.cs       | 16 +++++++--
 .../ExpediteDataManager.cs                    | 17 ++++++++--
 RestaurantManager.Models/OrderDataManager.cs  | 33 +++++++++++++++++--
 RestaurantManager.Models/RestaurantContext.cs |  2 +-
 .../MainPage.xaml                             |  3 +-
 .../OrderPage.xaml                            |  2 +-
 6 files changed, 62 insertions(+), 11 deletions(-)

diff --git a/RestaurantManager.Models/DataManager.cs b/RestaurantManager.Models/DataManager.cs
index 0488dab..8692459 100644
--- a/RestaurantManager.Models/DataManager.cs
+++ b/RestaurantManager.Models/DataManager.cs
@@ -1,6 +1,10 @@
-namespace RestaurantManager.Models
+using System.ComponentModel;
+using System.Diagnostics.Tracing;
+using System.Runtime.CompilerServices;
+
+namespace RestaurantManager.Models
 {
-    public abstract class DataManager
+    public abstract class DataManager : INotifyPropertyChanged
     {
         protected RestaurantContext Repository { get; private set; }
 
@@ -16,6 +20,14 @@ private async void LoadData()
             OnDataLoaded();
         }
 
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        public void OnPropertyChanged([CallerMemberName] string propName=null)
+        {
+            if (PropertyChanged != null)
+                PropertyChanged(this, new PropertyChangedEventArgs(propName));
+        }
+
         protected abstract void OnDataLoaded();
     }
 }
diff --git a/RestaurantManager.Models/ExpediteDataManager.cs b/RestaurantManager.Models/ExpediteDataManager.cs
index ad72e3e..43bde17 100644
--- a/RestaurantManager.Models/ExpediteDataManager.cs
+++ b/RestaurantManager.Models/ExpediteDataManager.cs
@@ -4,14 +4,27 @@ namespace RestaurantManager.Models
 {
     public class ExpediteDataManager : DataManager
     {
+        private List<Order> _orderItems;
+
         protected override void OnDataLoaded()
         {
-
+            OrderItems = Repository.Orders;
         }
 
         public List<Order> OrderItems
         {
-            get { return base.Repository.Orders; }
+            get
+            { 
+                return Repository.Orders;
+            }
+            set
+            {
+                if (_orderItems != value)
+                {
+                    _orderItems = value;
+                    OnPropertyChanged();
+                }
+            }
         }
     }
 }
diff --git a/RestaurantManager.Models/OrderDataManager.cs b/RestaurantManager.Models/OrderDataManager.cs
index 618c8d3..ff99ff7 100644
--- a/RestaurantManager.Models/OrderDataManager.cs
+++ b/RestaurantManager.Models/OrderDataManager.cs
@@ -3,7 +3,9 @@
 namespace RestaurantManager.Models
 {
     public class OrderDataManager : DataManager
-    {       
+    {
+        private List<MenuItem> _menuItems, _currentlySelectedMenuItems;
+
         protected override void OnDataLoaded()
         {
             this.MenuItems = base.Repository.StandardMenuItems;
@@ -13,10 +15,35 @@ protected override void OnDataLoaded()
                 this.MenuItems[3],
                 this.MenuItems[5]
             };
+
         }
 
-        public List<MenuItem> MenuItems { get; set; }
+        public List<MenuItem> MenuItems
+        {
+            get { return _menuItems; }
+            set
+            {
+                if (_menuItems != value)
+                {
+                    _menuItems = value;
+                    OnPropertyChanged();
+                }
+                
+            } 
+        }
 
-        public List<MenuItem> CurrentlySelectedMenuItems { get; set; }
+        public List<MenuItem> CurrentlySelectedMenuItems
+        {
+            get { return _currentlySelectedMenuItems; }
+            set
+            {
+                if (value != _currentlySelectedMenuItems)
+                {
+                    _currentlySelectedMenuItems = value;
+                    OnPropertyChanged();
+
+                }
+            }
+        }
     }
 }
diff --git a/RestaurantManager.Models/RestaurantContext.cs b/RestaurantManager.Models/RestaurantContext.cs
index 6e4ea42..8c9e1db 100644
--- a/RestaurantManager.Models/RestaurantContext.cs
+++ b/RestaurantManager.Models/RestaurantContext.cs
@@ -17,7 +17,7 @@ public sealed class RestaurantContext
         public async Task InitializeContextAsync()
         {
             //DO NOT REMOVE: Simulates network congestion
-            await Task.Delay(TimeSpan.FromSeconds(2.5d));
+            await Task.Delay(TimeSpan.FromSeconds(1.5d));
 
             this.Tables = new List<Table>
             {
diff --git a/RestaurantManager.UniversalWindows/MainPage.xaml b/RestaurantManager.UniversalWindows/MainPage.xaml
index 9740ca9..1055e6a 100644
--- a/RestaurantManager.UniversalWindows/MainPage.xaml
+++ b/RestaurantManager.UniversalWindows/MainPage.xaml
@@ -1,5 +1,4 @@
-<Page
-    x:Class="RestaurantManager.UniversalWindows.MainPage"
+<Page x:Class="RestaurantManager.UniversalWindows.MainPage"
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
     xmlns:local="using:RestaurantManager.UniversalWindows"
diff --git a/RestaurantManager.UniversalWindows/OrderPage.xaml b/RestaurantManager.UniversalWindows/OrderPage.xaml
index fd5e667..cdc45ed 100644
--- a/RestaurantManager.UniversalWindows/OrderPage.xaml
+++ b/RestaurantManager.UniversalWindows/OrderPage.xaml
@@ -37,7 +37,7 @@
         <TextBlock Grid.Row="2" Grid.Column="2" Text="Order Items:" />
         <TextBox Grid.Row="3" Grid.Column="1" />
         <ListView Grid.Row="2" Grid.RowSpan="3" Grid.Column="0" Margin="10" ItemsSource="{Binding MenuItems}" DisplayMemberPath="Title" />
-        <ListView Grid.Row="3" Grid.RowSpan="2" Grid.Column="2" Margin="10" ItemsSource="{Binding CurrentlySelectedMenuItems}" DisplayMemberPath="Title" />
+        <ListView Grid.Row="3" Grid.RowSpan="2" Grid.Column="2" Margin="10" ItemsSource="{Binding CurrentlySelectedMenuItems, Mode=TwoWay}" DisplayMemberPath="Title" />
         <Button Content="Add to Order" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="5" Grid.Column="0" />
         <Button Content="Submit Order" HorizontalAlignment="Center" VerticalAlignment="Center" Grid.Row="5" Grid.Column="1" Grid.ColumnSpan="2" />
     </Grid>