WM_NCPAINT / LM_NCPAINT support

[Max V. Terentiev]

Hi,

I'm porting visual component from Delphi to Lazaurs and want to make it cross-platform (at least support win32/64 and linux64).

It's looks like WM_NCPAINT (LM_NCPAINT) message never triggered in LCL/Lazaurs ! I found this topic from year 2007:

http://forum.lazarus-ide.org/index.php?topic=4328.0

They said:

Yes. LM_NCPAINT is never fired in LCL/Lazarus. You have to remap the code inside LM_PAINT.

Maybe something changes since 2007 ? Or it's not supported because it's not available in GTK/Linux ?

Maybe somebody know andy workaround for it ? ))

Thanks for help !

[jamie]

Yes its not a supported message, the Tform message handler procedure rejects it.

 I really don't understand why? I too also  use such messages for mouse tracking over the border
and title bar.

 For window support you can install a windows hook for the message procedure in the Tform and
handle the message yourself.
 
 I had to do this for a DSP application I ported over to capture the sound device messages etc.

 All messages below 1024 are filtered...

 So when implementing messages within the form you must start with LM_USER+?, classes otherwise
pass anything.