[Mono-bugs] [Bug 538645] New: Control.OnMouseWheel reports screen coordinates, not client coordinates.

bugzilla_noreply at novell.com bugzilla_noreply at novell.com
Fri Sep 11 16:01:10 EDT 2009


           Summary: Control.OnMouseWheel reports screen coordinates, not
                    client coordinates.
    Classification: Mono
           Product: Mono: Class Libraries
           Version: 2.4.x
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: landon.rabern at gmail.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---

User-Agent:       Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US)
AppleWebKit/530.5 (KHTML, like Gecko) Chrome/ Safari/530.5

It reports client coordinates in .NET.

The problem is that oddly the coordinates in the LPARAM of a WM_MOUSEWHEEL
notification are screen coordinates but they are client coordinates on
WM_LBUTTON and others. See


Needs a PointToClient in WmMouseWheel.

Reproducible: Always

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