WM_MOUSEMOVE and OnMouseMove

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#3867

From: JD
Date: Sun, 23 Apr 2006 13:24

19 lines
1444 bytes

I was getting some strange behavior when processing WM_MOUSEMOVE
and traced it back to how I was interpreting X,Y. The points
are passed in the message as words:

    if( Message.Msg == WM_MOUSEMOVE )
      {
          HeaderMouseMove( KeysToShiftState(Message.WParam), LOWORD(Message.LParam), HIWORD(Message.LParam) );
      }

and then interpreted as ints in the handler:

    void __fastcall TMyListView::HeaderMouseMove( TShiftState Shift, int X, int Y );

The problem was that negative numbers in a WORD just become
large number in the ints and I'm looking for an eligant way
of not loosing the sign.

~ JD

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