Window deactivation message?

What is the opposite of WM_ACTIVATE (Window deactivation messa开发者_开发问答ge)?

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It is the same message, but with a different argument - wparam = WA_INACTIVE.

Full details here.

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The message is WM_ACTIVATE. This message is sent both when the window is activated, and when it is deactivated. You can tell if it is deactivated by looking at the wParam parameter - either it is WA_ACTIVE or WA_CLICKACTIVE (activated), or it is WA_INACTIVE (inactivated).