1 files changed, 66 insertions, 0 deletions
diff --git a/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs b/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs
new file mode 100644
index 00000000..cf51e040
--- /dev/null
+++ b/src/SMAPI/Framework/StateTracking/Snapshots/WatcherSnapshot.cs
@@ -0,0 +1,66 @@
+using Microsoft.Xna.Framework;
+using StardewValley;
+using StardewValley.Menus;
+
+namespace StardewModdingAPI.Framework.StateTracking.Snapshots
+{
+    /// <summary>A frozen snapshot of the game state watchers.</summary>
+    internal class WatcherSnapshot
+    {
+        /*********
+        ** Accessors
+        *********/
+        /// <summary>Tracks changes to the window size.</summary>
+        public SnapshotDiff<Point> WindowSize { get; } = new SnapshotDiff<Point>();
+
+        /// <summary>Tracks changes to the current player.</summary>
+        public PlayerSnapshot CurrentPlayer { get; private set; }
+
+        /// <summary>Tracks changes to the time of day (in 24-hour military format).</summary>
+        public SnapshotDiff<int> Time { get; } = new SnapshotDiff<int>();
+
+        /// <summary>Tracks changes to the save ID.</summary>
+        public SnapshotDiff<ulong> SaveID { get; } = new SnapshotDiff<ulong>();
+
+        /// <summary>Tracks changes to the game's locations.</summary>
+        public WorldLocationsSnapshot Locations { get; } = new WorldLocationsSnapshot();
+
+        /// <summary>Tracks changes to <see cref="Game1.activeClickableMenu"/>.</summary>
+        public SnapshotDiff<IClickableMenu> ActiveMenu { get; } = new SnapshotDiff<IClickableMenu>();
+
+        /// <summary>Tracks changes to the cursor position.</summary>
+        public SnapshotDiff<ICursorPosition> Cursor { get; } = new SnapshotDiff<ICursorPosition>();
+
+        /// <summary>Tracks changes to the mouse wheel scroll.</summary>
+        public SnapshotDiff<int> MouseWheelScroll { get; } = new SnapshotDiff<int>();
+
+        /// <summary>Tracks changes to the content locale.</summary>
+        public SnapshotDiff<LocalizedContentManager.LanguageCode> Locale { get; } = new SnapshotDiff<LocalizedContentManager.LanguageCode>();
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Update the tracked values.</summary>
+        /// <param name="watchers">The watchers to snapshot.</param>
+        public void Update(WatcherCore watchers)
+        {
+            // update player instance
+            if (watchers.CurrentPlayerTracker == null)
+                this.CurrentPlayer = null;
+            else if (watchers.CurrentPlayerTracker.Player != this.CurrentPlayer?.Player)
+                this.CurrentPlayer = new PlayerSnapshot(watchers.CurrentPlayerTracker.Player);
+
+            // update snapshots
+            this.WindowSize.Update(watchers.WindowSizeWatcher);
+            this.Locale.Update(watchers.LocaleWatcher);
+            this.CurrentPlayer?.Update(watchers.CurrentPlayerTracker);
+            this.Time.Update(watchers.TimeWatcher);
+            this.SaveID.Update(watchers.SaveIdWatcher);
+            this.Locations.Update(watchers.LocationsWatcher);
+            this.ActiveMenu.Update(watchers.ActiveMenuWatcher);
+            this.Cursor.Update(watchers.CursorWatcher);
+            this.MouseWheelScroll.Update(watchers.MouseWheelScrollWatcher);
+        }
+    }
+}