From 70a1c17e034a260c96cb55c97b71f10eaa0564fe Mon Sep 17 00:00:00 2001
From: jsahn <jsahn@eroomai.com>
Date: Mon, 28 Sep 2026 16:52:18 +0900
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스크롤 이벤트를 가로채 제스처 phase가 없는 휠 이벤트만 세로 방향을 뒤집은
새 이벤트로 바꿔 보낸다. 원래 이벤트의 delta 필드만 수정하면 앱에 반영되지
않아 대체 이벤트 방식을 사용한다. 트랙패드와 가로 스크롤은 그대로 둔다.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
---
 README.md        |  2 ++
 razer-tilt.swift | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 50 insertions(+)

diff --git a/README.md b/README.md
index 7983b7a..393a69d 100644
--- a/README.md
+++ b/README.md
@@ -2,6 +2,8 @@
 
 Razer Pro Click V2 (vendor 5426, product 209)의 휠 좌우 틸트를 각각 `Command+[` / `Command+]`로 보냅니다. 제공한 HID 보고서의 첫 바이트와 비트 마스크를 그대로 사용합니다.
 
+마우스 휠의 세로 스크롤 방향도 반전합니다. 트랙패드와 Magic Mouse처럼 제스처로 스크롤하는 장치와 가로 스크롤은 바꾸지 않습니다.
+
 ## 설치 / 업데이트
 
 ```sh
diff --git a/razer-tilt.swift b/razer-tilt.swift
index f822713..8744216 100644
--- a/razer-tilt.swift
+++ b/razer-tilt.swift
@@ -147,4 +147,52 @@ let accessTimer: Timer? = accessGranted() ? nil : {
         }
     }
 }()
+
+// Invert vertical mouse-wheel scrolling. Trackpads and Magic Mouse send gesture phases;
+// wheels do not, even when their high-resolution scrolling is marked continuous.
+var scrollTap: CFMachPort?
+var lastScrollKind = ""
+// Marks the replacement events this app posts so the tap lets them through untouched.
+let invertedScrollMarker: Int64 = 0x52544D31
+let scrollCallback: CGEventTapCallBack = { proxy, type, event, _ in
+    if type == .tapDisabledByTimeout || type == .tapDisabledByUserInput {
+        if let tap = scrollTap { CGEvent.tapEnable(tap: tap, enable: true) }
+        return Unmanaged.passUnretained(event)
+    }
+    guard type == .scrollWheel,
+          event.getIntegerValueField(.eventSourceUserData) != invertedScrollMarker
+    else { return Unmanaged.passUnretained(event) }
+    let phase = event.getIntegerValueField(.scrollWheelEventScrollPhase)
+    let momentum = event.getIntegerValueField(.scrollWheelEventMomentumPhase)
+    let isWheel = phase == 0 && momentum == 0
+    let kind = "continuous=\(event.getIntegerValueField(.scrollWheelEventIsContinuous)) wheel=\(isWheel)"
+    if kind != lastScrollKind {
+        log("Scroll events: \(kind)")
+        lastScrollKind = kind
+    }
+    let pointY = event.getIntegerValueField(.scrollWheelEventPointDeltaAxis1)
+    guard isWheel, pointY != 0 else { return Unmanaged.passUnretained(event) }
+    // Apps read the hardware data attached to the original event, so editing its delta
+    // fields has no visible effect. Post a fresh event with the vertical delta flipped.
+    let pointX = event.getIntegerValueField(.scrollWheelEventPointDeltaAxis2)
+    guard let replacement = CGEvent(scrollWheelEvent2Source: nil, units: .pixel, wheelCount: 2,
+                                    wheel1: Int32(clamping: -pointY), wheel2: Int32(clamping: pointX), wheel3: 0)
+    else { return Unmanaged.passUnretained(event) }
+    replacement.location = event.location
+    replacement.flags = event.flags
+    replacement.setIntegerValueField(.eventSourceUserData, value: invertedScrollMarker)
+    replacement.tapPostEvent(proxy)
+    return nil
+}
+if accessGranted() {
+    scrollTap = CGEvent.tapCreate(tap: .cgSessionEventTap, place: .headInsertEventTap, options: .defaultTap,
+                                  eventsOfInterest: CGEventMask(1 << CGEventType.scrollWheel.rawValue),
+                                  callback: scrollCallback, userInfo: nil)
+    if let tap = scrollTap {
+        CFRunLoopAddSource(CFRunLoopGetCurrent(), CFMachPortCreateRunLoopSource(kCFAllocatorDefault, tap, 0), .commonModes)
+        log("Mouse wheel inversion running")
+    } else {
+        log("Mouse wheel inversion failed: could not create event tap")
+    }
+}
 CFRunLoopRun()