From cd873eb9fed0841cc23137626f715265d972663d Mon Sep 17 00:00:00 2001
From: Sam Lantinga <slouken@lokigames.com>
Date: Sat, 16 Jun 2001 01:01:42 +0000
Subject: [PATCH] Mouse wheel sends mouse button (4/5) events on Windows

---
 docs.html                           |  1 +
 src/video/wincommon/SDL_sysevents.c | 28 ++++++++++++++++++++++++++++
 src/video/windx5/SDL_dx5events.c    | 14 ++++++++++++++
 3 files changed, 43 insertions(+)

diff --git a/docs.html b/docs.html
index 5c1c85ef3..f27b858fe 100644
--- a/docs.html
+++ b/docs.html
@@ -16,6 +16,7 @@ <H2>
 Major changes since SDL 1.0.0:
 </H2>
 <UL>
+	<LI> 1.2.1: Mouse wheel sends mouse button (4/5) events on Windows
 	<LI> 1.2.1: Added MacOS X Project Builder projects (thanks Darrell!)
 	<LI> 1.2.1: Added initial support for Quartz video (thanks Darrell!)
 	<LI> 1.2.1: Disabled Linux /dev/event joystick interface by default
diff --git a/src/video/wincommon/SDL_sysevents.c b/src/video/wincommon/SDL_sysevents.c
index ec46bbfa8..8c9f136b6 100644
--- a/src/video/wincommon/SDL_sysevents.c
+++ b/src/video/wincommon/SDL_sysevents.c
@@ -321,6 +321,34 @@ static LONG CALLBACK WinMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lPara
 		}
 		return(0);
 
+
+#if (_WIN32_WINNT >= 0x0400) || (_WIN32_WINDOWS > 0x0400)
+		case WM_MOUSEWHEEL: 
+			if ( SDL_VideoSurface && ! DINPUT_FULLSCREEN() ) {
+				Sint16 x, y;
+				Uint8 button = 0;
+				int move = (short)HIWORD(wParam);
+				if(move > 0)
+					button = 4;
+				else if(move < 0)
+					button = 5;
+				if(button)
+				{
+					if ( mouse_relative ) {
+					/*	RJR: March 28, 2000
+						report internal mouse position if in relative mode */
+						x = 0; y = 0;
+					} else {
+						x = (Sint16)LOWORD(lParam);
+						y = (Sint16)HIWORD(lParam);
+					}
+					posted = SDL_PrivateMouseButton(
+								SDL_PRESSED, button, x, y);
+				}
+			}
+			return(0);
+#endif
+
 #ifdef WM_GETMINMAXINFO
 		/* This message is sent as a way for us to "check" the values
 		 * of a position change.  If we don't like it, we can adjust
diff --git a/src/video/windx5/SDL_dx5events.c b/src/video/windx5/SDL_dx5events.c
index 81c321b28..3514ede22 100644
--- a/src/video/windx5/SDL_dx5events.c
+++ b/src/video/windx5/SDL_dx5events.c
@@ -379,6 +379,20 @@ static void handle_mouse(const int numevents, DIDEVICEOBJECTDATA *ptrbuf)
 			case DIMOFS_Y:
 				yrel += (Sint16)ptrbuf[i].dwData;
 				break;
+			case DIMOFS_Z:
+				if ( xrel || yrel ) {
+					posted = SDL_PrivateMouseMotion(
+							0, 1, xrel, yrel);
+					xrel = 0;
+					yrel = 0;
+				}
+				if((int)ptrbuf[i].dwData > 0)
+					posted = SDL_PrivateMouseButton(
+							SDL_PRESSED, 4, 0, 0);
+				else if((int)ptrbuf[i].dwData < 0)
+					posted = SDL_PrivateMouseButton(
+							SDL_PRESSED, 5, 0, 0);
+				break;
 			case DIMOFS_BUTTON0:
 			case DIMOFS_BUTTON1:
 			case DIMOFS_BUTTON2: