From 0e40e4795a697bda7d8240d2767d7fb3f3a582bc Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Mon, 20 Feb 2023 16:00:03 -0600
Subject: [PATCH] Implement horizontal scrolling

---
 Limelight/Input/StreamView.m | 37 +++++++++++++++++++++++++++++-------
 1 file changed, 30 insertions(+), 7 deletions(-)

diff --git a/Limelight/Input/StreamView.m b/Limelight/Input/StreamView.m
index 04b93a8e..a399858a 100644
--- a/Limelight/Input/StreamView.m
+++ b/Limelight/Input/StreamView.m
@@ -474,10 +474,22 @@ static const double X1_MOUSE_SPEED_DIVISOR = 2.5;
     }
     
     CGPoint currentScrollTranslation = [gesture translationInView:self];
-    short translationDeltaY = ((currentScrollTranslation.y - lastScrollTranslation.y) / self.bounds.size.height) * 120; // WHEEL_DELTA
-    if (translationDeltaY != 0) {
-        LiSendHighResScrollEvent(translationDeltaY * 20);
-        lastScrollTranslation = currentScrollTranslation;
+    
+    {
+        short translationDeltaY = ((currentScrollTranslation.y - lastScrollTranslation.y) / self.bounds.size.height) * 120; // WHEEL_DELTA
+        if (translationDeltaY != 0) {
+            LiSendHighResScrollEvent(translationDeltaY * 20);
+            lastScrollTranslation = currentScrollTranslation;
+        }
+    }
+
+    {
+        short translationDeltaX = ((currentScrollTranslation.x - lastScrollTranslation.x) / self.bounds.size.width) * 120; // WHEEL_DELTA
+        if (translationDeltaX != 0) {
+            // Direction is reversed from vertical scrolling
+            LiSendHighResHScrollEvent(-translationDeltaX * 20);
+            lastScrollTranslation = currentScrollTranslation;
+        }
     }
 }
 
@@ -497,9 +509,20 @@ static const double X1_MOUSE_SPEED_DIVISOR = 2.5;
     // Using velocityInView is 0 for discrete scroll events
     // when scrolling very slowly, but translationInView does work.
     CGPoint currentScrollTranslation = [gesture translationInView:self];
-    short translationDeltaY = currentScrollTranslation.y - lastScrollTranslation.y;
-    if (translationDeltaY != 0) {
-        LiSendScrollEvent(translationDeltaY > 0 ? 1 : -1);
+    
+    {
+        short translationDeltaY = currentScrollTranslation.y - lastScrollTranslation.y;
+        if (translationDeltaY != 0) {
+            LiSendScrollEvent(translationDeltaY > 0 ? 1 : -1);
+        }
+    }
+
+    {
+        short translationDeltaX = currentScrollTranslation.x - lastScrollTranslation.x;
+        if (translationDeltaX != 0) {
+            // Direction is reversed from vertical scrolling
+            LiSendHScrollEvent(translationDeltaX < 0 ? 1 : -1);
+        }
     }
     
     lastScrollTranslation = currentScrollTranslation;