From c6ecaf44424be159af1fdf677e02fbbe0c6650a5 Mon Sep 17 00:00:00 2001
From: Jay Sorg <jay.sorg@gmail.com>
Date: Tue, 16 Oct 2012 09:57:12 -0700
Subject: [PATCH] win32: added mouse wheel support

---
 client/Windows/wf_event.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/client/Windows/wf_event.c b/client/Windows/wf_event.c
index 94e7ac310..bc955a9e6 100644
--- a/client/Windows/wf_event.c
+++ b/client/Windows/wf_event.c
@@ -119,6 +119,27 @@ LRESULT CALLBACK wf_ll_kbd_proc(int nCode, WPARAM wParam, LPARAM lParam)
 	return CallNextHookEx(NULL, nCode, wParam, lParam);
 }
 
+static int xf_event_process_WM_MOUSEWHEEL(wfInfo* wfi, HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam, boolean app)
+{
+	int delta;
+	int flags;
+	rdpInput* input;
+
+	DefWindowProc(hWnd, Msg, wParam, lParam);
+	input = wfi->instance->input;
+	delta = ((signed short)HIWORD(wParam)); /* GET_WHEEL_DELTA_WPARAM(wParam); */
+	if (delta > 0)
+	{
+		flags = PTR_FLAGS_WHEEL | 0x0078;
+	}
+	else
+	{
+		flags = PTR_FLAGS_WHEEL | PTR_FLAGS_WHEEL_NEGATIVE | 0x0088;
+	}
+	input->MouseEvent(input, flags, 0, 0);
+	return 0;
+}
+
 LRESULT CALLBACK wf_event_proc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
 {
 	HDC hdc;
@@ -173,6 +194,10 @@ LRESULT CALLBACK wf_event_proc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam
 			case WM_MOUSEMOVE:
 				input->MouseEvent(input, PTR_FLAGS_MOVE, X_POS(lParam), Y_POS(lParam));
 				break;
+			
+			case WM_MOUSEWHEEL:
+				xf_event_process_WM_MOUSEWHEEL(wfi, hWnd, Msg, wParam, lParam, FALSE);
+				break;
 
 			case WM_SETCURSOR:
 				SetCursor(wfi->cursor);