first commit

ClassicAssist.Shared/Data/Counters/CountersManager.cs

@@ -0,0 +1,129 @@
+using System;
+using System.Collections.ObjectModel;
+using System.Collections.Specialized;
+using System.ComponentModel;
+using System.Runtime.CompilerServices;
+using ClassicAssist.Shared;
+using ClassicAssist.Annotations;
+using ClassicAssist.UO.Data;
+using ClassicAssist.UO.Network;
+using ClassicAssist.UO.Objects;
+
+namespace ClassicAssist.Data.Counters
+{
+    public class CountersManager : INotifyPropertyChanged
+    {
+        private static CountersManager _instance;
+        private static readonly object _instanceLock = new object();
+        private ObservableCollection<CountersAgentEntry> _items = new ObservableCollection<CountersAgentEntry>();
+        private bool _listening;
+
+        private CountersManager()
+        {
+            Items.CollectionChanged += OnCollectionChanged;
+
+            IncomingPacketHandlers.ContainerContentsEvent += OnContainerContentsEvent;
+            IncomingPacketHandlers.NewWorldItemEvent += OnNewWorldItemEvent;
+
+            Engine.DisconnectedEvent += () =>
+            {
+                if ( Engine.Player != null )
+                {
+                    Engine.Player.Backpack.Container.CollectionChanged -= OnBackpackContentsChanged;
+                }
+
+                _listening = false;
+            };
+        }
+
+        public ObservableCollection<CountersAgentEntry> Items
+        {
+            get => _items;
+            set => SetProperty( ref _items, value );
+        }
+
+        public Action RecountAll { get; set; }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private void OnNewWorldItemEvent( Item item )
+        {
+            RecountAll?.Invoke();
+        }
+
+        private void OnContainerContentsEvent( int serial, ItemCollection container )
+        {
+            if ( Engine.Player == null )
+            {
+                return;
+            }
+
+            if ( Engine.Player.Backpack?.Container == null )
+            {
+                return;
+            }
+
+            if ( !Engine.Items.GetItem( serial, out Item item ) )
+            {
+                return;
+            }
+
+            if ( item.Owner == Engine.Player.Serial && item.Layer == Layer.Backpack && !_listening )
+            {
+                Engine.Player.Backpack.Container.CollectionChanged += OnBackpackContentsChanged;
+
+                RecountAll?.Invoke();
+
+                _listening = true;
+
+                return;
+            }
+
+            if ( item.IsDescendantOf( Engine.Player.Backpack.Serial ) )
+            {
+                // Is child item of backpack
+                RecountAll?.Invoke();
+            }
+        }
+
+        private void OnBackpackContentsChanged( int totalcount, bool added, Item[] items )
+        {
+            RecountAll?.Invoke();
+        }
+
+        private void OnCollectionChanged( object sender, NotifyCollectionChangedEventArgs e )
+        {
+            OnPropertyChanged( nameof( Items ) );
+        }
+
+        public static CountersManager GetInstance()
+        {
+            // ReSharper disable once InvertIf
+            if ( _instance == null )
+            {
+                lock ( _instanceLock )
+                {
+                    if ( _instance == null )
+                    {
+                        _instance = new CountersManager();
+                    }
+                }
+            }
+
+            return _instance;
+        }
+
+        [NotifyPropertyChangedInvocator]
+        protected virtual void OnPropertyChanged( [CallerMemberName] string propertyName = null )
+        {
+            PropertyChanged?.Invoke( this, new PropertyChangedEventArgs( propertyName ) );
+        }
+
+        // ReSharper disable once RedundantAssignment
+        public void SetProperty<T>( ref T obj, T value, [CallerMemberName] string propertyName = "" )
+        {
+            obj = value;
+            OnPropertyChanged( propertyName );
+        }
+    }
+}