[ros-dev] [gvg] 19895: Make sure that WM_NCPAINT messages are generated by calling BeginPaint

[Filip Navara]

Ge van Geldorp wrote:

>>From: Filip Navara
>>
>>The previous code was perfectly valid. Why did you change it? 
>>If GetUpdateRect returns FALSE then there's no need to call 
>>BeginPaint...
>>    
>>
>
>Possibly I fixed it wrong. Try minimizing the window with the old code. This
>will set the WINDOWOBJECT_NEED_NCPAINT flag. As a result, an endless stream
>of WM_PAINT messages is generated, 'cause that flag is never reset. Calling
>BeginPaint resets the flag.
>  
>
I overlooked that the code used GetUpdateRect with the last parameter 
set to FALSE, it should be set to TRUE. In that case GetUpdateRect is 
responsible for sending the WM_NCPAINT message and cleaning the update 
region.

- Filip