From 90f55a6921ac798e03d6f81240d3a9899544c031 Mon Sep 17 00:00:00 2001
From: Jesse Plamondon-Willard <github@jplamondonw.com>
Date: Sat, 2 Jun 2018 12:14:15 -0400
Subject: add mouse scroll event (#310)

---
 src/SMAPI/Framework/Events/EventManager.cs   |  4 ++++
 src/SMAPI/Framework/Events/ModInputEvents.cs |  7 +++++++
 src/SMAPI/Framework/SGame.cs                 | 15 +++++++++++++++
 3 files changed, 26 insertions(+)

(limited to 'src/SMAPI/Framework')

diff --git a/src/SMAPI/Framework/Events/EventManager.cs b/src/SMAPI/Framework/Events/EventManager.cs
index eea74587..9f67244a 100644
--- a/src/SMAPI/Framework/Events/EventManager.cs
+++ b/src/SMAPI/Framework/Events/EventManager.cs
@@ -44,6 +44,9 @@ namespace StardewModdingAPI.Framework.Events
         /// <summary>Raised after the player moves the in-game cursor.</summary>
         public readonly ManagedEvent<InputCursorMovedArgsInput> Input_CursorMoved;
 
+        /// <summary>Raised after the player scrolls the mouse wheel.</summary>
+        public readonly ManagedEvent<InputMouseWheelScrolledEventArgs> Input_MouseWheelScrolled;
+
 
         /*********
         ** Events (old)
@@ -249,6 +252,7 @@ namespace StardewModdingAPI.Framework.Events
             this.Input_ButtonPressed = ManageEventOf<InputButtonPressedArgsInput>(nameof(IModEvents.Input), nameof(IInputEvents.ButtonPressed));
             this.Input_ButtonReleased = ManageEventOf<InputButtonReleasedArgsInput>(nameof(IModEvents.Input), nameof(IInputEvents.ButtonReleased));
             this.Input_CursorMoved = ManageEventOf<InputCursorMovedArgsInput>(nameof(IModEvents.Input), nameof(IInputEvents.CursorMoved));
+            this.Input_MouseWheelScrolled = ManageEventOf<InputMouseWheelScrolledEventArgs>(nameof(IModEvents.Input), nameof(IInputEvents.MouseWheelScrolled));
 
             this.World_BuildingListChanged = ManageEventOf<WorldBuildingListChangedEventArgs>(nameof(IModEvents.World), nameof(IWorldEvents.LocationListChanged));
             this.World_LargeTerrainFeatureListChanged = ManageEventOf<WorldLargeTerrainFeatureListChangedEventArgs>(nameof(IModEvents.World), nameof(IWorldEvents.LargeTerrainFeatureListChanged));
diff --git a/src/SMAPI/Framework/Events/ModInputEvents.cs b/src/SMAPI/Framework/Events/ModInputEvents.cs
index 48dd0369..387ea87a 100644
--- a/src/SMAPI/Framework/Events/ModInputEvents.cs
+++ b/src/SMAPI/Framework/Events/ModInputEvents.cs
@@ -30,6 +30,13 @@ namespace StardewModdingAPI.Framework.Events
             remove => this.EventManager.Input_CursorMoved.Remove(value);
         }
 
+        /// <summary>Raised after the player scrolls the mouse wheel.</summary>
+        public event EventHandler<InputMouseWheelScrolledEventArgs> MouseWheelScrolled
+        {
+            add => this.EventManager.Input_MouseWheelScrolled.Add(value);
+            remove => this.EventManager.Input_MouseWheelScrolled.Remove(value);
+        }
+
 
         /*********
         ** Public methods
diff --git a/src/SMAPI/Framework/SGame.cs b/src/SMAPI/Framework/SGame.cs
index 894a771f..18529728 100644
--- a/src/SMAPI/Framework/SGame.cs
+++ b/src/SMAPI/Framework/SGame.cs
@@ -103,6 +103,9 @@ namespace StardewModdingAPI.Framework
         /// <summary>Tracks changes to the cursor position.</summary>
         private readonly IValueWatcher<Point> CursorWatcher;
 
+        /// <summary>Tracks changes to the mouse wheel scroll.</summary>
+        private readonly IValueWatcher<int> MouseWheelScrollWatcher;
+
         /// <summary>The previous content locale.</summary>
         private LocalizedContentManager.LanguageCode? PreviousLocale;
 
@@ -172,6 +175,7 @@ namespace StardewModdingAPI.Framework
             // init watchers
             Game1.locations = new ObservableCollection<GameLocation>();
             this.CursorWatcher = WatcherFactory.ForEquatable(() => this.Input.MousePosition);
+            this.MouseWheelScrollWatcher = WatcherFactory.ForEquatable(() => this.Input.RealMouse.ScrollWheelValue);
             this.SaveIdWatcher = WatcherFactory.ForEquatable(() => Game1.hasLoadedGame ? Game1.uniqueIDForThisGame : 0);
             this.WindowSizeWatcher = WatcherFactory.ForEquatable(() => new Point(Game1.viewport.Width, Game1.viewport.Height));
             this.TimeWatcher = WatcherFactory.ForEquatable(() => Game1.timeOfDay);
@@ -180,6 +184,7 @@ namespace StardewModdingAPI.Framework
             this.Watchers.AddRange(new IWatcher[]
             {
                 this.CursorWatcher,
+                this.MouseWheelScrollWatcher,
                 this.SaveIdWatcher,
                 this.WindowSizeWatcher,
                 this.TimeWatcher,
@@ -468,6 +473,16 @@ namespace StardewModdingAPI.Framework
                         }
                         this.PreviousCursorPosition = cursor;
 
+                        // raise mouse wheel scrolled
+                        if (this.MouseWheelScrollWatcher.IsChanged)
+                        {
+                            int oldValue = this.MouseWheelScrollWatcher.PreviousValue;
+                            int newValue = this.MouseWheelScrollWatcher.CurrentValue;
+                            this.MouseWheelScrollWatcher.Reset();
+
+                            this.Events.Input_MouseWheelScrolled.Raise(new InputMouseWheelScrolledEventArgs(cursor, oldValue, newValue));
+                        }
+
                         // raise input button events
                         foreach (var pair in inputState.ActiveButtons)
                         {
-- 
cgit