add LocationEvents.ObjectsChanged event

1 files changed, 71 insertions, 0 deletions

diff --git a/src/SMAPI/Framework/StateTracking/LocationTracker.cs b/src/SMAPI/Framework/StateTracking/LocationTracker.cs
new file mode 100644
index 00000000..8cf4e7a2
--- /dev/null
+++ b/src/SMAPI/Framework/StateTracking/LocationTracker.cs
@@ -0,0 +1,71 @@
+using System.Collections.Generic;
+using System.Linq;
+using Microsoft.Xna.Framework;
+using StardewModdingAPI.Framework.StateTracking.FieldWatchers;
+using StardewValley;
+using Object = StardewValley.Object;
+
+namespace StardewModdingAPI.Framework.StateTracking
+{
+    /// <summary>Tracks changes to a location's data.</summary>
+    internal class LocationTracker : IWatcher
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The underlying watchers.</summary>
+        private readonly List<IWatcher> Watchers = new List<IWatcher>();
+
+
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>Whether the value changed since the last reset.</summary>
+        public bool IsChanged => this.Watchers.Any(p => p.IsChanged);
+
+        /// <summary>The tracked location.</summary>
+        public GameLocation Location { get; }
+
+        /// <summary>Tracks changes to the current location's objects.</summary>
+        public IDictionaryWatcher<Vector2, Object> LocationObjectsWatcher { get; }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="location">The location to track.</param>
+        public LocationTracker(GameLocation location)
+        {
+            this.Location = location;
+
+            // init watchers
+            this.LocationObjectsWatcher = WatcherFactory.ForNetDictionary(location.netObjects);
+            this.Watchers.AddRange(new[]
+            {
+                this.LocationObjectsWatcher
+            });
+        }
+
+        /// <summary>Stop watching the player fields and release all references.</summary>
+        public void Dispose()
+        {
+            foreach (IWatcher watcher in this.Watchers)
+                watcher.Dispose();
+        }
+
+        /// <summary>Update the current value if needed.</summary>
+        public void Update()
+        {
+            foreach (IWatcher watcher in this.Watchers)
+                watcher.Update();
+        }
+
+        /// <summary>Set the current value as the baseline.</summary>
+        public void Reset()
+        {
+            foreach (IWatcher watcher in this.Watchers)
+                watcher.Reset();
+        }
+    }
+}