[lazarus] Non-visual component drawing

[Micha Nelissen]

Nelissen, M. wrote:

> Mattias Gaertner wrote:
> 
>>For win32 the normal paint messages should be enough. Please test, if the
>>designer is getting the paint messages and if they are handled at the right
>>time (after letting the control draw itself). 
>>Maybe we need to adapt the BeginPaint, EndPaint to the designer.
> 
> 
> I now understand better. TWinControl.WMPaint needs to send the lm_paint 
> through the perform method, not only call WMPaint.
> 
> However, now I have another problem: the designerdevicecontext.FDCSize 
> is (0,0) and stays so. The line GetDeviceSize (designerprocs.pas:286) 
> never gets executed. Can you help me?

On second thought, it does get executed, but GetDeviceSize is not 
implemented for win32, because it is not possible to retrieve the size 
of a device context given a specific handle. Please advise :(.

Micha.