WM_NCACTIVATE

The WM_NCACTIVATE message is sent to a window when its nonclient area needs to be changed to indicate an active or inactive state.

WM_NCACTIVATE 
fActive = (BOOL) wParam;   // new state of the title bar or icon 
 

Parameters

fActive

Value of wParam. Specifies when a title bar or icon needs to be changed to indicate an active or inactive state. If an active title bar or icon is to be drawn, the fActive parameter is TRUE. It is FALSE for an inactive title bar or icon.

Return Values

When the fActive parameter is FALSE, an application should return TRUE to indicate that the system should proceed with the default processing, or it should return FALSE to prevent the title bar or icon from being deactivated. When fActive is TRUE, the return value is ignored.

Default Action

The DefWindowProc function draws the title bar or icon title in its active colors when the fActive parameter is TRUE and in its inactive colors when fActive is FALSE.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in winuser.h.

See Also

Windows Overview, Window Messages, DefWindowProc