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WM_MOUSEACTIVATE Overview  Group

The WM_MOUSEACTIVATE message is sent when the cursor is in an inactive window and the user presses a mouse button. The parent window receives this message only if the child window passes it to the DefWindowProc function.

WM_MOUSEACTIVATE 

hwndTopLevel = (HWND) wParam;       // handle of top-level parent 

nHittest = (INT) LOWORD(lParam);    // hit-test value 

uMsg =    (UINT) HIWORD(lParam);    // mouse message 

 

Parameters

hwndTopLevel
Value of wParam. Identifies the top-level parent window of the window being activated.
nHittest
Value of the low-order word of lParam. Specifies the hit-test value returned by the DefWindowProc function as a result of processing the WM_NCHITTEST message. For a list of hit-test values, see WM_NCHITTEST.
uMsg
Value of the high-order word of lParam. Specifies the identifier of the mouse message generated when the user pressed a mouse button. The mouse message is either discarded or posted to the window, depending on the return value.

Return Values

The return value specifies whether the window should be activated and whether the identifier of the mouse message should be discarded. It must be one of the following values:

Value

Meaning

MA_ACTIVATE

Activates the window, and does not discard the mouse message.

MA_ACTIVATEANDEAT

Activates the window, and discards the mouse message.

MA_NOACTIVATE

Does not activate the window, and does not discard the mouse message.

MA_NOACTIVATEANDEAT

Does not activate the window, but discards the mouse message.

Default Action

The DefWindowProc function passes the message to a child window’s parent window before any processing occurs. The parent window determines whether to activate the child window. If it activates the child window, the parent window should return MA_NOACTIVATE or MA_NOACTIVATEANDEAT to prevent the system from processing the message further.

See Also

DefWindowProc, WM_NCHITTEST

See also:


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