From 74ee7676df5720c1624d79e5cdb3d6fdf29c78f3 Mon Sep 17 00:00:00 2001
From: Patrik Nyblom <pan@erlang.org>
Date: Thu, 9 Dec 2010 15:11:05 +0100
Subject: Teach win_con.c about scroll wheels

---
 erts/emulator/drivers/win32/win_con.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'erts/emulator/drivers/win32/win_con.c')

diff --git a/erts/emulator/drivers/win32/win_con.c b/erts/emulator/drivers/win32/win_con.c
index 2202ca655f..14f7941643 100644
--- a/erts/emulator/drivers/win32/win_con.c
+++ b/erts/emulator/drivers/win32/win_con.c
@@ -704,6 +704,18 @@ FrameWndProc(HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam)
 	}
         write_inbuf(&c, 1);
 	return 0;
+    case WM_MOUSEWHEEL:
+      {
+	int delta = GET_WHEEL_DELTA_WPARAM(wParam);
+	if (delta < 0) {
+	  PostMessage(hClientWnd, WM_VSCROLL, MAKELONG(SB_THUMBTRACK,
+						       (iVscrollPos + 5)),0);
+	} else {
+	  WORD pos = ((iVscrollPos - 5) < 0) ? 0 : (iVscrollPos - 5);
+	  PostMessage(hClientWnd, WM_VSCROLL, MAKELONG(SB_THUMBTRACK,pos),0);
+	}
+      return 0;
+      }
     case WM_CHAR:
 	c = (TCHAR)wParam;
         write_inbuf(&c,1);
-- 
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