From 8e7e54e49f7e09e327f448da5501465500e4843f Mon Sep 17 00:00:00 2001
From: Koichiro IWAO <meta@vmeta.jp>
Date: Fri, 27 Oct 2017 14:16:18 +0900
Subject: [PATCH] xrdp_wm: handle horizontal mouse wheel events

---
 xrdp/xrdp_wm.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/xrdp/xrdp_wm.c b/xrdp/xrdp_wm.c
index 1f5b4953..8c35c5ef 100644
--- a/xrdp/xrdp_wm.c
+++ b/xrdp/xrdp_wm.c
@@ -1683,6 +1683,7 @@ xrdp_wm_process_input_mouse(struct xrdp_wm *self, int device_flags,
         }
     }
 
+    /* vertical mouse wheel */
     if (device_flags & 0x200) /* PTRFLAGS_WHEEL */
     {
         if (device_flags & 0x100) /* PTRFLAGS_WHEEL_NEGATIVE */
@@ -1695,6 +1696,24 @@ xrdp_wm_process_input_mouse(struct xrdp_wm *self, int device_flags,
         }
     }
 
+    /* horizontal mouse wheel */
+
+    /**
+     * As mstsc does MOUSE not MOUSEX for horizontal scrolling,
+     * PTRFLAGS_HWHEEL must be handled here.
+     */
+    if (device_flags & 0x400) /* PTRFLAGS_HWHEEL */
+    {
+        if (device_flags & 0x100) /* PTRFLAGS_WHEEL_NEGATIVE */
+        {
+            xrdp_wm_mouse_click(self, 0, 0, 6, 0);
+        }
+        else
+        {
+            xrdp_wm_mouse_click(self, 0, 0, 7, 0);
+        }
+    }
+
     return 0;
 }