MFC Private Windows MessagesWM_SIZEPARENT This message is sent by a frame window to its immediate children during resizing (CFrameWnd::OnSize calls CFrameWnd::RecalcLayout which calls CWnd::RepositionBars) to reposition the control bars around the side of the frame. The AFX_SIZEPARENTPARAMS structure contains the current available client rectangle of the parent and a HDWP (which may be NULL) with which to call DeferWindowPos to minimize repainting.wParam Not used
lParam Address of an AFX_SIZEPARENTPARAMS structure
returns Not used (0) Ignoring the message indicates that the window doesn't take part in the layout.
Not used
lParam
Address of an AFX_SIZEPARENTPARAMS structure
returns
Not used (0)
Ignoring the message indicates that the window doesn't take part in the layout.