Added mouse wheel support for MSW. It generates a wxMouseEvent with a

type of wxEVT_MOUSEWHEEL.

wxMouseEvent has new members and accessors to transport mouse wheel
rotation data.  New members and accessors are documented.

wxGenericScrolledWindow modified to turn mouse wheel events into
scroll actions.

Added wxUSE_MOUSEWHEEL to setup0.h to allow disabling the platform
specific parts.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@9990 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/window.h

@@ -327,6 +327,7 @@ public:
 
     bool HandleMouseEvent(WXUINT msg, int x, int y, WXUINT flags);
     bool HandleMouseMove(int x, int y, WXUINT flags);
+    bool HandleMouseWheel(WXWPARAM wParam, WXLPARAM lParam);
 
     bool HandleChar(WXWPARAM wParam, WXLPARAM lParam, bool isASCII = FALSE);
     bool HandleKeyDown(WXWPARAM wParam, WXLPARAM lParam);