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From: risto@tuura.UUCP (Risto Lankinen)
Newsgroups: comp.windows.ms.programmer
Subject: Re: Tracking the mouse...
Message-ID: <823@tuura.UUCP>
Date: 31 Oct 90 08:18:22 GMT
References: <5538@hsv3.UUCP>
Organization: Nokia Data Systems Oy
Lines: 32

jls@hsv3.UUCP (James Seidman) writes:


>I'm trying to create a child window which can tell when the cursor goes in
>or out of it.  The state of the window needs to be different depending on
>whether or not the cursor is currently inside it.

>Now, figuring out when the mouse is inside it is easy, by capturing
>WM_MOUSEMOVE.  However, figuring out when the mouse leaves the window
>is harder. 

Hi!

You could try polling the mouse with GetCursorPos() within the application's
message loop, and check whether the cursor is inside the desired child window
by calling WindowFromPoint() .  If it were, you could act directly, or, more
elegantly, send that window a self-defined WM_USER message with wParam set to
indicate cursor entering / exiting status when the hWnd returned by Window-
FromPoint() has changed.

This could also be made as a DLL were there a need to cooperate among many
instances of the same application.  The DLL would contain a 'windowless' 
process to poll the mouse position and two functions which the application
uses to register a window being checked + the corresponding event handler,
and to un-register the service before the application terminates.

Terveisin: Risto Lankinen
-- 
Risto Lankinen / product specialist ***************************************
Nokia Data Systems, Technology Dept *  2                              2   *
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