+[TC8.50b2] BG copy processed MB flickering

[ghisler(Author)]

Unfortunately it's not possible to improve it, because this is a Windows dialog (created via resource editor), not a Delphi dialog where I could draw with double buffering. This is necessary because Delphi dialogs aren't thead-safe.

[MarcinW]

There is an extended windows style, introduced in Windows XP SP1 - WS_EX_COMPOSITED:

http://msdn.microsoft.com/en-us/library/windows/desktop/ff700543.aspx
http://msdn.microsoft.com/en-us/library/ms632680.aspx

Calling this during dialog initialization should help:

Code: Select all

const
  WS_EX_COMPOSITED = $02000000;

WM_INITDIALOG:
  SetWindowLong(Handle,GWL_EXSTYLE,GetWindowLong(Handle,GWL_EXSTYLE) or WS_EX_COMPOSITED);

[ghisler(Author)]

Thanks, that seems to be helping indeed!

[ghisler(Author)]

Can you try it, please? I have added WS_EX_COMPOSITED to the background dialog now.

[gdpr deleted 6]

I did a quick try of TC8.5b5 32-bit in a virtual machine (again ) running Windows 7. The theme is the classic XP Windows theme (no DWM double-buffering).

As far as i can tell, the flickering is gone.

[ghisler(Author)]

Great, thanks for trying it!