add multiplayer sync events (#479)

6 files changed, 129 insertions, 0 deletions

diff --git a/src/SMAPI/Events/MultiplayerEvents.cs b/src/SMAPI/Events/MultiplayerEvents.cs
new file mode 100644
index 00000000..f96ecba5
--- /dev/null
+++ b/src/SMAPI/Events/MultiplayerEvents.cs
@@ -0,0 +1,58 @@
+using System;
+using StardewModdingAPI.Framework.Events;
+
+namespace StardewModdingAPI.Events
+{
+    /// <summary>Events raised during the multiplayer sync process.</summary>
+    public static class MultiplayerEvents
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>The core event manager.</summary>
+        private static EventManager EventManager;
+
+
+        /*********
+        ** Events
+        *********/
+        /// <summary>Raised before the game syncs changes from other players.</summary>
+        public static event EventHandler BeforeMainSync
+        {
+            add => MultiplayerEvents.EventManager.Multiplayer_BeforeMainSync.Add(value);
+            remove => MultiplayerEvents.EventManager.Multiplayer_BeforeMainSync.Remove(value);
+        }
+
+        /// <summary>Raised after the game syncs changes from other players.</summary>
+        public static event EventHandler AfterMainSync
+        {
+            add => MultiplayerEvents.EventManager.Multiplayer_AfterMainSync.Add(value);
+            remove => MultiplayerEvents.EventManager.Multiplayer_AfterMainSync.Remove(value);
+        }
+
+        /// <summary>Raised before the game broadcasts changes to other players.</summary>
+        public static event EventHandler BeforeMainBroadcast
+        {
+            add => MultiplayerEvents.EventManager.Multiplayer_BeforeMainBroadcast.Add(value);
+            remove => MultiplayerEvents.EventManager.Multiplayer_BeforeMainBroadcast.Remove(value);
+        }
+
+        /// <summary>Raised after the game broadcasts changes to other players.</summary>
+        public static event EventHandler AfterMainBroadcast
+        {
+            add => MultiplayerEvents.EventManager.Multiplayer_AfterMainBroadcast.Add(value);
+            remove => MultiplayerEvents.EventManager.Multiplayer_AfterMainBroadcast.Remove(value);
+        }
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Initialise the events.</summary>
+        /// <param name="eventManager">The core event manager.</param>
+        internal static void Init(EventManager eventManager)
+        {
+            MultiplayerEvents.EventManager = eventManager;
+        }
+    }
+}
diff --git a/src/SMAPI/Framework/Events/EventManager.cs b/src/SMAPI/Framework/Events/EventManager.cs
index d7c89a76..87ff760f 100644
--- a/src/SMAPI/Framework/Events/EventManager.cs
+++ b/src/SMAPI/Framework/Events/EventManager.cs
@@ -126,6 +126,21 @@ namespace StardewModdingAPI.Framework.Events
         public readonly ManagedEvent<EventArgsClickableMenuClosed> Menu_Closed;
 
         /****
+        ** MultiplayerEvents
+        ****/
+        /// <summary>Raised before the game syncs changes from other players.</summary>
+        public readonly ManagedEvent Multiplayer_BeforeMainSync;
+
+        /// <summary>Raised after the game syncs changes from other players.</summary>
+        public readonly ManagedEvent Multiplayer_AfterMainSync;
+
+        /// <summary>Raised before the game broadcasts changes to other players.</summary>
+        public readonly ManagedEvent Multiplayer_BeforeMainBroadcast;
+
+        /// <summary>Raised after the game broadcasts changes to other players.</summary>
+        public readonly ManagedEvent Multiplayer_AfterMainBroadcast;
+
+        /****
         ** MineEvents
         ****/
         /// <summary>Raised after the player warps to a new level of the mine.</summary>
@@ -228,6 +243,11 @@ namespace StardewModdingAPI.Framework.Events
             this.Menu_Changed = ManageEventOf<EventArgsClickableMenuChanged>(nameof(MenuEvents), nameof(MenuEvents.MenuChanged));
             this.Menu_Closed = ManageEventOf<EventArgsClickableMenuClosed>(nameof(MenuEvents), nameof(MenuEvents.MenuClosed));
 
+            this.Multiplayer_BeforeMainBroadcast = ManageEvent(nameof(MultiplayerEvents), nameof(MultiplayerEvents.BeforeMainBroadcast));
+            this.Multiplayer_AfterMainBroadcast = ManageEvent(nameof(MultiplayerEvents), nameof(MultiplayerEvents.AfterMainBroadcast));
+            this.Multiplayer_BeforeMainSync = ManageEvent(nameof(MultiplayerEvents), nameof(MultiplayerEvents.BeforeMainSync));
+            this.Multiplayer_AfterMainSync = ManageEvent(nameof(MultiplayerEvents), nameof(MultiplayerEvents.AfterMainSync));
+
             this.Mine_LevelChanged = ManageEventOf<EventArgsMineLevelChanged>(nameof(MineEvents), nameof(MineEvents.MineLevelChanged));
 
             this.Player_InventoryChanged = ManageEventOf<EventArgsInventoryChanged>(nameof(PlayerEvents), nameof(PlayerEvents.InventoryChanged));
diff --git a/src/SMAPI/Framework/SGame.cs b/src/SMAPI/Framework/SGame.cs
index 7ea83957..89bf18ef 100644
--- a/src/SMAPI/Framework/SGame.cs
+++ b/src/SMAPI/Framework/SGame.cs
@@ -155,6 +155,7 @@ namespace StardewModdingAPI.Framework
             if (this.ContentCore == null) // shouldn't happen since CreateContentManager is called first, but let's init here just in case
                 this.ContentCore = new ContentCore(this.Content.ServiceProvider, this.Content.RootDirectory, Thread.CurrentThread.CurrentUICulture, this.Monitor, reflection);
             Game1.input = new SInputState();
+            Game1.multiplayer = new SMultiplayer(monitor, eventManager);
 
             // init watchers
             Game1.locations = new ObservableCollection<GameLocation>();
diff --git a/src/SMAPI/Framework/SMultiplayer.cs b/src/SMAPI/Framework/SMultiplayer.cs
new file mode 100644
index 00000000..687b1922
--- /dev/null
+++ b/src/SMAPI/Framework/SMultiplayer.cs
@@ -0,0 +1,47 @@
+using StardewModdingAPI.Framework.Events;
+using StardewValley;
+
+namespace StardewModdingAPI.Framework
+{
+    /// <summary>SMAPI's implementation of the game's core multiplayer logic.</summary>
+    internal class SMultiplayer : Multiplayer
+    {
+        /*********
+        ** Properties
+        *********/
+        /// <summary>Encapsulates monitoring and logging.</summary>
+        private readonly IMonitor Monitor;
+
+        /// <summary>Manages SMAPI events.</summary>
+        private readonly EventManager EventManager;
+
+
+        /*********
+        ** Public methods
+        *********/
+        /// <summary>Construct an instance.</summary>
+        /// <param name="monitor">Encapsulates monitoring and logging.</param>
+        /// <param name="eventManager">Manages SMAPI events.</param>
+        public SMultiplayer(IMonitor monitor, EventManager eventManager)
+        {
+            this.Monitor = monitor;
+            this.EventManager = eventManager;
+        }
+
+        /// <summary>Handle sync messages from other players and perform other initial sync logic.</summary>
+        public override void UpdateEarly()
+        {
+            this.EventManager.Multiplayer_BeforeMainSync.Raise();
+            base.UpdateEarly();
+            this.EventManager.Multiplayer_AfterMainSync.Raise();
+        }
+
+        /// <summary>Broadcast sync messages to other players and perform other final sync logic.</summary>
+        public override void UpdateLate(bool forceSync = false)
+        {
+            this.EventManager.Multiplayer_BeforeMainBroadcast.Raise();
+            base.UpdateLate(forceSync);
+            this.EventManager.Multiplayer_AfterMainBroadcast.Raise();
+        }
+    }
+}
diff --git a/src/SMAPI/Program.cs b/src/SMAPI/Program.cs
index dc9e5308..2325e79a 100644
--- a/src/SMAPI/Program.cs
+++ b/src/SMAPI/Program.cs
@@ -157,6 +157,7 @@ namespace StardewModdingAPI
             LocationEvents.Init(this.EventManager);
             MenuEvents.Init(this.EventManager);
             MineEvents.Init(this.EventManager);
+            MultiplayerEvents.Init(this.EventManager);
             PlayerEvents.Init(this.EventManager);
             SaveEvents.Init(this.EventManager);
             SpecialisedEvents.Init(this.EventManager);
diff --git a/src/SMAPI/StardewModdingAPI.csproj b/src/SMAPI/StardewModdingAPI.csproj
index 560d7bf4..f6a16e5f 100644
--- a/src/SMAPI/StardewModdingAPI.csproj
+++ b/src/SMAPI/StardewModdingAPI.csproj
@@ -85,6 +85,7 @@
     <Compile Include="..\..\build\GlobalAssemblyInfo.cs">
       <Link>Properties\GlobalAssemblyInfo.cs</Link>
     </Compile>
+    <Compile Include="Events\MultiplayerEvents.cs" />
     <Compile Include="Framework\Events\EventManager.cs" />
     <Compile Include="Framework\Events\ManagedEvent.cs" />
     <Compile Include="Events\SpecialisedEvents.cs" />
@@ -132,6 +133,7 @@
     <Compile Include="Framework\Serialisation\CrossplatformConverters\RectangleConverter.cs" />
     <Compile Include="Framework\Serialisation\CrossplatformConverters\ColorConverter.cs" />
     <Compile Include="Framework\Serialisation\CrossplatformConverters\PointConverter.cs" />
+    <Compile Include="Framework\SMultiplayer.cs" />
     <Compile Include="Framework\StateTracking\Comparers\EquatableComparer.cs" />
     <Compile Include="Framework\StateTracking\Comparers\ObjectReferenceComparer.cs" />
     <Compile Include="Framework\StateTracking\FieldWatchers\BaseDisposableWatcher.cs" />