From 0b869de08df37c50dff44ccb73aaa9542f9a98ad Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@libsdl.org>
Date: Fri, 6 Jul 2007 09:22:18 +0000
Subject: [PATCH] Fixed bug #382

Added horizontal scrolling support
---
 include/SDL_compat.h              |  2 ++
 include/SDL_events.h              |  3 ++-
 src/SDL_compat.c                  | 43 +++++++++++++++++++++----------
 src/events/SDL_mouse.c            |  7 ++---
 src/events/SDL_mouse_c.h          |  2 +-
 src/video/cocoa/SDL_cocoawindow.m |  2 +-
 src/video/win32/SDL_win32events.c |  2 +-
 7 files changed, 41 insertions(+), 20 deletions(-)

diff --git a/include/SDL_compat.h b/include/SDL_compat.h
index bac3ca225..2ee673b79 100644
--- a/include/SDL_compat.h
+++ b/include/SDL_compat.h
@@ -63,6 +63,8 @@ extern "C" {
 
 #define SDL_BUTTON_WHEELUP	4
 #define SDL_BUTTON_WHEELDOWN	5
+#define SDL_BUTTON_WHEELLEFT	6
+#define SDL_BUTTON_WHEELRIGHT	7
 
 #define SDL_DEFAULT_REPEAT_DELAY	500
 #define SDL_DEFAULT_REPEAT_INTERVAL	30
diff --git a/include/SDL_events.h b/include/SDL_events.h
index ae6612e9d..f06a8ba3b 100644
--- a/include/SDL_events.h
+++ b/include/SDL_events.h
@@ -199,7 +199,8 @@ typedef struct SDL_MouseWheelEvent
 {
     Uint8 type;             /**< SDL_MOUSEWHEEL */
     Uint8 which;            /**< The mouse device index */
-    int motion;             /**< The direction and distance scrolled */
+    int x;                  /**< The amount scrolled horizontally */
+    int y;                  /**< The amount scrolled vertically */
     SDL_WindowID windowID;  /**< The window with mouse focus, if any */
 } SDL_MouseWheelEvent;
 
diff --git a/src/SDL_compat.c b/src/SDL_compat.c
index 937e9e104..83838d205 100644
--- a/src/SDL_compat.c
+++ b/src/SDL_compat.c
@@ -256,25 +256,42 @@ SDL_CompatEventFilter(void *userdata, SDL_Event * event)
             SDL_GetMouseState(&x, &y);
             SDL_SelectMouse(selected);
 
-            if (event->wheel.motion > 0) {
-                button = SDL_BUTTON_WHEELUP;
-            } else {
-                button = SDL_BUTTON_WHEELDOWN;
-            }
-
             fake.button.which = event->wheel.windowID;
-            fake.button.button = button;
             fake.button.x = x;
             fake.button.y = y;
             fake.button.windowID = event->wheel.windowID;
 
-            fake.type = SDL_MOUSEBUTTONDOWN;
-            fake.button.state = SDL_PRESSED;
-            SDL_PushEvent(&fake);
+            if (event->wheel.y) {
+                if (event->wheel.y > 0) {
+                    fake.button.button = SDL_BUTTON_WHEELUP;
+                } else {
+                    fake.button.button = SDL_BUTTON_WHEELDOWN;
+                }
+
+                fake.type = SDL_MOUSEBUTTONDOWN;
+                fake.button.state = SDL_PRESSED;
+                SDL_PushEvent(&fake);
+
+                fake.type = SDL_MOUSEBUTTONUP;
+                fake.button.state = SDL_RELEASED;
+                SDL_PushEvent(&fake);
+            }
+            if (event->wheel.x) {
+                if (event->wheel.y > 0) {
+                    fake.button.button = SDL_BUTTON_WHEELLEFT;
+                } else {
+                    fake.button.button = SDL_BUTTON_WHEELRIGHT;
+                }
+
+                fake.type = SDL_MOUSEBUTTONDOWN;
+                fake.button.state = SDL_PRESSED;
+                SDL_PushEvent(&fake);
+
+                fake.type = SDL_MOUSEBUTTONUP;
+                fake.button.state = SDL_RELEASED;
+                SDL_PushEvent(&fake);
+            }
 
-            fake.type = SDL_MOUSEBUTTONUP;
-            fake.button.state = SDL_RELEASED;
-            SDL_PushEvent(&fake);
             break;
         }
 
diff --git a/src/events/SDL_mouse.c b/src/events/SDL_mouse.c
index c66e80ecb..b2579dc0f 100644
--- a/src/events/SDL_mouse.c
+++ b/src/events/SDL_mouse.c
@@ -427,12 +427,12 @@ SDL_SendMouseButton(int index, Uint8 state, Uint8 button)
 }
 
 int
-SDL_SendMouseWheel(int index, int motion)
+SDL_SendMouseWheel(int index, int x, int y)
 {
     SDL_Mouse *mouse = SDL_GetMouse(index);
     int posted;
 
-    if (!mouse || !motion) {
+    if (!mouse || (!x && !y)) {
         return 0;
     }
 
@@ -442,7 +442,8 @@ SDL_SendMouseWheel(int index, int motion)
         SDL_Event event;
         event.type = SDL_MOUSEWHEEL;
         event.wheel.which = (Uint8) index;
-        event.wheel.motion = motion;
+        event.wheel.x = x;
+        event.wheel.y = y;
         event.wheel.windowID = mouse->focus;
         posted = (SDL_PushEvent(&event) > 0);
     }
diff --git a/src/events/SDL_mouse_c.h b/src/events/SDL_mouse_c.h
index 4bc60835f..530e38106 100644
--- a/src/events/SDL_mouse_c.h
+++ b/src/events/SDL_mouse_c.h
@@ -102,7 +102,7 @@ extern int SDL_SendMouseMotion(int index, int relative, int x, int y);
 extern int SDL_SendMouseButton(int index, Uint8 state, Uint8 button);
 
 /* Send a mouse wheel event for a mouse at an index */
-extern int SDL_SendMouseWheel(int index, int motion);
+extern int SDL_SendMouseWheel(int index, int x, int y);
 
 /* Shutdown the mouse subsystem */
 extern void SDL_MouseQuit(void);
diff --git a/src/video/cocoa/SDL_cocoawindow.m b/src/video/cocoa/SDL_cocoawindow.m
index e8034e630..30e94240e 100644
--- a/src/video/cocoa/SDL_cocoawindow.m
+++ b/src/video/cocoa/SDL_cocoawindow.m
@@ -274,7 +274,7 @@ - (void)scrollWheel:(NSEvent *)theEvent
     int index;
 
     index = _data->videodata->mouse;
-    SDL_SendMouseWheel(index, (int)([theEvent deltaY]+0.9f));
+    SDL_SendMouseWheel(index, (int)([theEvent deltaX]+0.9f), (int)([theEvent deltaY]+0.9f));
 }
 
 @end
diff --git a/src/video/win32/SDL_win32events.c b/src/video/win32/SDL_win32events.c
index 05d32fbdd..948dd1a65 100644
--- a/src/video/win32/SDL_win32events.c
+++ b/src/video/win32/SDL_win32events.c
@@ -645,7 +645,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
             int motion = (short) HIWORD(wParam);
 
             index = data->videodata->mouse;
-            SDL_SendMouseWheel(index, motion);
+            SDL_SendMouseWheel(index, 0, motion);
         }
         return (0);