Conformation and remove, which is in the same area.
ValidateRect:
... validates the client area within a rectangle ...
https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-validaterect
[in] lpRect
... is NULL, the entire client area is removed.
ValidateRgn:
... validates the client area within a rectangle ...
https://docs.microsoft.com/en-us/windows/win32/api/winuser/nf-winuser-validaterect
*Conformation(remain)
The area is going to remain for the next step if we set the area not NULL.
| - | - | ||
| - | - | ||
| - | - | ||
| - | - | ||
*remove
The area is not going to remain but going to remove whole for the next step if we set the area NULL.
Remarks:
Neither the ValidateRect nor ValidateRgn function should be called.
...
The system continues to generate WM_PAINT messages until the current update region is validated.
*neither ,,, nor ...
... used for showing that something is not true of two or more people, things, actions, qualities, or ideas.
