[lazarus] Win32: moving and message handling

[Mattias Gaertner]

On Sun, 06 Jul 2003 15:56:24 +0200
Micha Nelissen <M.Nelissen at student.tue.nl> wrote:

> Hi,
> 
> I still have to object again the latest patch for WM_MOVE handling, the 
> previous one was better. That is because the internal variables haven't 
> been updated when WM_MOVE is sent, only after it has been processed they 
> are updated. So when GetWindowRect is called it retrieves the wrong 
> values. So use the information in the LParam at least:
> 
> XPos := LoWord(LParam);
> YPos := HiWord(LParam);
> 
> (Maybe compensate for client rect ourselves, but certainly don't use the 
> GetWindowRect / GetClientRect functions). This also explains the weird 
> behaviour of maximizing: The form stays the same size because 
> GetClientRect returns the previous client size, not the current one.

The maximizing should now be better.


Mattias


> 
> About message handling: maybe it would be better the always first pass 
> the message into the LCL, then if the LCL doesn't handle, let it pass 
> through and call the default window proc in DefaultHandler. The problem 
> is that now the LCL first receives WM_MOVE and then WM_WINDOWPOSCHANGED 
> because internally windows calls WM_MOVE inside handling the 
> WM_WINDOWPOSCHANGED.
> 
> Regards,
> 
> Micha.
> 
> 
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