Reorganization

Aurora/Design/Components/NavigationMenu/NavigationMenu.xaml.cs

@@ -0,0 +1,77 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.ObjectModel;
+using Xamarin.Forms;
+
+namespace Aurora.Design.Components.NavigationMenu
+{
+    public partial class NavigationMenu : ContentPage
+    {
+        public NavigationMenu()
+        {
+            InitializeComponent();
+            ListView = MenuItemsListView;
+        }
+
+        public ListView ListView;
+
+        public static readonly BindableProperty ItemsProperty =
+            BindableProperty.Create(propertyName: nameof(Items),
+                returnType: typeof(ObservableCollection<NavigationItem>),
+                declaringType: typeof(NavigationMenu),
+                defaultBindingMode: BindingMode.TwoWay,
+                propertyChanged: OnItemsChanged);
+
+        public ObservableCollection<NavigationItem> Items
+        {
+            get
+            {
+                return (ObservableCollection<NavigationItem>)GetValue(ItemsProperty);
+            }
+            set
+            {
+                SetValue(ItemsProperty, value);
+            }
+        }
+
+        /// <summary>
+        /// Items changed event handler. Organizes items in groups for display.
+        /// </summary>
+        /// <param name="bindable">The changed Item.</param>
+        /// <param name="oldValue">The previous value.</param>
+        /// <param name="newValue">The new value.</param>
+        private static void OnItemsChanged(BindableObject bindable, object oldValue, object newValue)
+        {
+            var control = (NavigationMenu)bindable;
+            ObservableCollection<NavigationItem> items = (ObservableCollection<NavigationItem>)newValue;
+            Dictionary<string, NavigationGroupItem> groupDictioanry = new Dictionary<string, NavigationGroupItem>();
+
+            //Populate dictionary where group heading is the key
+            foreach (NavigationItem item in items)
+            {
+                if (groupDictioanry.ContainsKey(item.Group))
+                {
+                    groupDictioanry.TryGetValue(item.Group, out var groupItem);
+                    groupItem.Items.Add(item);
+                }
+                else
+                {
+                    NavigationGroupItem groupItem = new NavigationGroupItem(item.Group);
+                    groupItem.Add(item);
+
+                    groupDictioanry.Add(item.Group, groupItem);
+                }
+            }
+
+            ObservableCollection<NavigationGroupItem> groups = new ObservableCollection<NavigationGroupItem>();
+            foreach (string groupHeading in groupDictioanry.Keys)
+            {
+                groupDictioanry.TryGetValue(groupHeading, out var groupItem);
+                groups.Add(groupItem);
+            }
+
+            control.MenuItemsListView.ItemsSource = groups;
+        }
+
+    }
+}