From ec33788e315a2a59d9b80fb9925b9069e190810d Mon Sep 17 00:00:00 2001
From: William McBrine <wmcbrine@gmail.com>
Date: Sat, 23 Apr 2011 06:50:03 +0000
Subject: [PATCH] Left/right scroll wheel support for SDL and Win32. Still not
 tested.

---
 sdl1/pdckbd.c  | 20 ++++++++++++++++----
 win32/pdckbd.c | 15 ++++++++++++++-
 2 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/sdl1/pdckbd.c b/sdl1/pdckbd.c
index 56bf1e47..57a88e1c 100644
--- a/sdl1/pdckbd.c
+++ b/sdl1/pdckbd.c
@@ -2,7 +2,7 @@
 
 #include "pdcsdl.h"
 
-RCSID("$Id: pdckbd.c,v 1.20 2008/07/14 04:24:52 wmcbrine Exp $")
+RCSID("$Id: pdckbd.c,v 1.21 2011/04/23 06:50:02 wmcbrine Exp $")
 
 /*man-start**************************************************************
 
@@ -282,12 +282,24 @@ static int _process_mouse_event(void)
 
         /* handle scroll wheel */
 
-        if ((btn == 4 || btn == 5) && action == BUTTON_RELEASED)
+        if ((btn >= 4 && btn <= 7) && action == BUTTON_RELEASED)
         {
             pdc_mouse_status.x = pdc_mouse_status.y = -1;
 
-            pdc_mouse_status.changes = (btn == 5) ?
-                PDC_MOUSE_WHEEL_DOWN : PDC_MOUSE_WHEEL_UP;
+            switch (btn)
+            {
+            case 4:
+                pdc_mouse_status.changes = PDC_MOUSE_WHEEL_UP;
+                break;
+            case 5:
+                pdc_mouse_status.changes = PDC_MOUSE_WHEEL_DOWN;
+                break;
+            case 6:
+                pdc_mouse_status.changes = PDC_MOUSE_WHEEL_LEFT;
+                break;
+            case 7:
+                pdc_mouse_status.changes = PDC_MOUSE_WHEEL_RIGHT;
+            }
 
             return KEY_MOUSE;
         }
diff --git a/win32/pdckbd.c b/win32/pdckbd.c
index 1c5b05b0..7717260d 100644
--- a/win32/pdckbd.c
+++ b/win32/pdckbd.c
@@ -2,7 +2,7 @@
 
 #include "pdcwin.h"
 
-RCSID("$Id: pdckbd.c,v 1.115 2008/07/20 20:12:04 wmcbrine Exp $")
+RCSID("$Id: pdckbd.c,v 1.116 2011/04/23 06:50:03 wmcbrine Exp $")
 
 /*man-start**************************************************************
 
@@ -486,6 +486,19 @@ static int _process_mouse_event(void)
         return KEY_MOUSE;
     }
 
+    if (MEV.dwEventFlags == 8)
+    {
+        pdc_mouse_status.changes = (MEV.dwButtonState & 0xFF000000) ?
+            PDC_MOUSE_WHEEL_RIGHT : PDC_MOUSE_WHEEL_LEFT;
+
+        pdc_mouse_status.x = -1;
+        pdc_mouse_status.y = -1;
+
+        memset(&old_mouse_status, 0, sizeof(old_mouse_status));
+
+        return KEY_MOUSE;
+    }
+
     action = (MEV.dwEventFlags == 2) ? BUTTON_DOUBLE_CLICKED :
             ((MEV.dwEventFlags == 1) ? BUTTON_MOVED : BUTTON_PRESSED);