VC中分割窗口后如何限制分割条移动范围

void CMySplitter::OnMouseMove(UINT nFlags, CPoint point) 
{  
 // 限制切分条的运动范围。  
 if(point.x<228||point.x>600)  
 {  
  CWnd::OnMouseMove(nFlags, point);  
 }  
 else  
 {  
  CSplitterWnd::OnMouseMove(nFlags, point);  
 }  
}

protected:  
CMySplitter m_wndSplitter; //切分窗口对象  

//在MaiFram.cpp中实现窗口切分：  
BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT /*lpcs*/,CCreateContext* pContext)  
{  
 // 创建拆分器窗口  
 if (!m_wndSplitter.CreateStatic(this, 1, 2))  
  return FALSE;  
 if (!m_wndSplitter.CreateView(0, 0, RUNTIME_CLASS(CLeftView), CSize(228, 100), pContext) ||  
  !m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CDataEditView), CSize(100, 100), pContext))  
 {  
  m_wndSplitter.DestroyWindow();  
  return FALSE;  
 }  

 return TRUE;  
}