Added new InputEvent.MouseScrollEvent, fixes #5811 (#6037)

patches/minecraft/net/minecraft/client/MouseHelper.java.patch

@@ -38,7 +38,15 @@
              } else if (this.field_198036_a.field_71439_g != null) {
                 if (this.field_200542_o != 0.0D && Math.signum(d0) != Math.signum(this.field_200542_o)) {
                    this.field_200542_o = 0.0D;
-@@ -168,7 +174,9 @@
+@@ -129,6 +135,7 @@
+                }
+ 
+                this.field_200542_o -= (double)f1;
++               if (net.minecraftforge.client.ForgeHooksClient.onMouseScroll(this, d0)) return;
+                if (this.field_198036_a.field_71439_g.func_175149_v()) {
+                   if (this.field_198036_a.field_71456_v.func_175187_g().func_175262_a()) {
+                      this.field_198036_a.field_71456_v.func_175187_g().func_195621_a((double)(-f1));
+@@ -168,7 +175,9 @@
                 double d2 = (p_198022_3_ - this.field_198040_e) * (double)this.field_198036_a.field_195558_d.func_198107_o() / (double)this.field_198036_a.field_195558_d.func_198105_m();
                 double d3 = (p_198022_5_ - this.field_198041_f) * (double)this.field_198036_a.field_195558_d.func_198087_p() / (double)this.field_198036_a.field_195558_d.func_198083_n();
                 Screen.wrapScreenError(() -> {
@@ -49,7 +57,7 @@
                 }, "mouseDragged event handler", iguieventlistener.getClass().getCanonicalName());
              }
           }
-@@ -233,6 +241,10 @@
+@@ -233,6 +242,10 @@
        return this.field_198039_d;
     }
  
@@ -60,7 +68,7 @@
     public double func_198024_e() {
        return this.field_198040_e;
     }
-@@ -241,6 +253,14 @@
+@@ -241,6 +254,14 @@
        return this.field_198041_f;
     }
  

src/main/java/net/minecraftforge/client/ForgeHooksClient.java

@@ -1037,4 +1037,10 @@ public class ForgeHooksClient
     {
         MinecraftForge.EVENT_BUS.post(new InputEvent.KeyInputEvent(key, scanCode, action, modifiers));
     }
+
+    public static boolean onMouseScroll(MouseHelper mouseHelper, double scrollDelta)
+    {
+        Event event = new InputEvent.MouseScrollEvent(scrollDelta, mouseHelper.isLeftDown(), mouseHelper.isMiddleDown(), mouseHelper.isRightDown(), mouseHelper.getMouseX(), mouseHelper.getMouseY());
+        return MinecraftForge.EVENT_BUS.post(event);
+    }
 }

src/main/java/net/minecraftforge/client/event/InputEvent.java

@@ -20,6 +20,7 @@
 package net.minecraftforge.client.event;
 
 import net.minecraft.client.util.InputMappings;
+import net.minecraftforge.eventbus.api.Cancelable;
 import net.minecraftforge.eventbus.api.Event;
 
 import org.lwjgl.glfw.GLFW;
@@ -78,6 +79,59 @@ public class InputEvent extends Event
         }
     }
 
+    /**
+     * This event fires when the mouse scroll wheel is used outside of a gui.
+     */
+    @Cancelable
+    public static class MouseScrollEvent extends InputEvent
+    {
+        private final double scrollDelta;
+        private final double mouseX;
+        private final double mouseY;
+        private final boolean leftDown;
+        private final boolean middleDown;
+        private final boolean rightDown;
+        public MouseScrollEvent(double scrollDelta, boolean leftDown, boolean middleDown, boolean rightDown, double mouseX, double mouseY)
+        {
+            this.scrollDelta = scrollDelta;
+            this.leftDown = leftDown;
+            this.middleDown = middleDown;
+            this.rightDown = rightDown;
+            this.mouseX = mouseX;
+            this.mouseY = mouseY;
+        }
+
+        public double getScrollDelta()
+        {
+            return this.scrollDelta;
+        }
+
+        public boolean isLeftDown()
+        {
+            return this.leftDown;
+        }
+
+        public boolean isRightDown()
+        {
+            return this.rightDown;
+        }
+
+        public boolean isMiddleDown()
+        {
+            return this.middleDown;
+        }
+
+        public double getMouseX()
+        {
+            return this.mouseX;
+        }
+
+        public double getMouseY()
+        {
+            return this.mouseY;
+        }
+    }
+
     /**
      * This event fires when a keyboard input is detected.
      */