Re: WM_MOUSEMOVE and OnMouseMove

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#3868

From: Bob Gonder
Date: Sun, 23 Apr 2006 16:49

19 lines
1629 bytes

JD wrote:

>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:
>
>          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.

Convert to shorts:
	MAKEPOINTS( Message.LParam ).x
	MAKEPOINTS( Message.LParam ).y

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From: Bob Gonder <notbg@notmindspring.invalid>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Re: WM_MOUSEMOVE and OnMouseMove
Date: Sun, 23 Apr 2006 09:49:17 -0700
Organization: MindSpring Enterprises, Inc.
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