Difference between WM_ValidateWindow and WM_InvlidateWindow

jaybee · Feb 5th 2014, 9:54am

Afrer reading documentation of emWIn I'm little bit confused with function WM_ValidateWindow. I know "invalidating" from other toolkits but as I know, no other GUI toolkit has "validate" function.

After calling of function WM_InvlidateWindow, window is forced to redraw its content. After calling WM_ValidateWindow, nothing visible happend.

What is the purpose of WM_ValidateWindow?

Thank you,
Jan

SEGGER - Adrian · Feb 6th 2014, 9:14am

Hello Jan,

The function WM_ValidateWindow() can be used to avoid superfluous drawings of a window. Please have a look at the sample application MOTION_IconSlide. It uses the function WM_ValidateWindow().

Best regards,
Adrian

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