Hi,
ShowScrollBar -> Windows.RedrawWindow
Can some win32 developer explain, why the paint is immediate. Why not queue?
Mattias
Mailing lists / lazarus / 2013-01
win32 ShowScrollBar triggers immediate paint
6 messages · 3 people ·
- Paul Ishenin 3
- Mattias Gaertner 2
- luiz americo pereira camara 1
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05.01.13, 19:20, Mattias Gaertner ?????:
Show quoted text 6 lines
Hi,
ShowScrollBar -> Windows.RedrawWindow
Can some win32 developer explain, why the paint is immediate. Why not
queue?
Immediate is not extremely needed but why not to do so? This is done to reduce the time when scrollbars are drawn wrong.
Best regards,
Paul Ishenin
ShowScrollBar -> Windows.RedrawWindow Can some win32 developer explain, why the paint is…
2013/1/5 Mattias Gaertner :
Show quoted text 6 lines
Hi,
ShowScrollBar -> Windows.RedrawWindow
Can some win32 developer explain, why the paint is immediate. Why not
queue?
Some notes:
Here in windows 7, no wm_paint is called
according to docs:
http://msdn.microsoft.com/en-us/library/windows/desktop/dd162911%28v=vs.85%29.aspx no immediate paint should occur with the used falgs
Luiz
Show quoted text 8 lines
Mattias
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05.01.13, 19:46, luiz americo pereira camara ?????:
Show quoted text 7 lines
Some notes:
Here in windows 7, no wm_paint is called
according to docs:
http://msdn.microsoft.com/en-us/library/windows/desktop/dd162911%28v=vs.85%29.aspx
no immediate paint should occur with the used falgs
Thanks. Seems I start to forget winapi.
Best regards,
Paul Ishenin.
05.01.13, 19:20, Mattias Gaertner ?????: Immediate is not extremely needed but why not to…
Show quoted text 9 lines
05.01.13, 19:20, Mattias Gaertner ?????:
> Hi,
>
> ShowScrollBar -> Windows.RedrawWindow
>
> Can some win32 developer explain, why the paint is immediate. Why not
> queue?
Immediate is not extremely needed but why not to do so?
Because multiple changes to the scrollbar causes flickering. The same with any change. That's why queued drawing should be the default in all widgetsets.
This is done to reduce the time when scrollbars are drawn wrong.
What is drawing wrong?
Mattias
05.01.13, 20:48, Mattias Gaertner ?????:
What is drawing wrong?
For some reason scrollbar had been drawn non-themed before the first repaint. I can't imagine a reason. This was visible in IDE component tree (above object inspector). We also had a bug report somewhere.
Best regards,
Paul Ishenin