CWnd::OnSizing
afx_msg void OnSizing( UINT nSide**, LPRECT** lpRect );
Parameters
nSide
The edge of window to be moved.
lpRect
Address of the CRect or RECT structure that will contain the item’s coordinates.
Remarks
The framework calls this member function to indicate that the user is resizing the rectangle. By processing this message, an application can monitor the size and position of the drag rectangle and, if needed, change its size or position.
Note This member function is called by the framework to allow your application to handle a Windows message. The parameters passed to your function reflect the parameters received by the framework when the message was received. If you call the base-class implementation of this function, that implementation will use the parameters originally passed with the message and not the parameters you supply to the function.
Example
void CMainFrame::OnSizing(UINT fwSide, LPRECT pRect)
{
CFrameWnd::OnSizing(fwSide, pRect);
// Resize the splitter window in the frame. m_SplitWnd is of
// type CSplitterWnd
int nWidth=(pRect->right)-(pRect->left);
m_SplitWnd.SetColumnInfo(0,nWidth/2,10);
m_SplitWnd.SetColumnInfo(1,nWidth/2,10);
m_SplitWnd.RecalcLayout();
}