使用VC轻松实现视图切换

 
使用VC创建单文档,并实现视图切换
步骤(一):
在CMainFrame类中添加CSplitterWnd类对象：
CSplitterWnd m_wndSplitter;

重载CMainFrame类的OnCreateClient()函数,代码如下:
BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext) 
{
    // TODO: Add your specialized code here and/or call the base class
    if( !m_wndSplitter.CreateStatic(this, 1, 2) )
    {
      return FALSE;
    }

    CRect bClientRect;
    GetClientRect( &bClientRect );
    if ( !m_wndSplitter.CreateView(0, 0, pContext->m_pNewViewClass, 
         CSize(bClientRect.Width()/4, 50), pContext) )
    {
       return FALSE;
    }

    if ( !m_wndSplitter.CreateView(0, 1, RUNTIME_CLASS(CEliteWelcomeView),
         CSize(200, 50), pContext ) )
    {
       return FALSE;
    }

    SetActiveView( (CView *)m_wndSplitter.GetPane( 0, 1 ) );

    return TRUE;
}

步骤(二):
添加自定义消息:
#define   WM_CHANGEDVIEW    WM_USER+100

添加自定义消息处理函数：
afx_msg void OnChangedeView(WPARAM wParam, LPARAM lParam);

函数实现（本范例在Client创建了两个视，其中第一个是是固定显示TreeView，第二个视根据第一个视的选项来进行切换）：
void CMainFrame::OnChangedeView( WPARAM wParam, LPARAM lParam )
{
    CCreateContext bContext;
    UINT uiDlgID = (UINT)wParam;

    CDocument *pDoc = ((CView *)m_wndSplitter.GetPane(0, 1))->GetDocument();

    pDoc->m_bAutoDelete = FALSE;
    ((CView *)m_wndSplitter.GetPane(0, 1))->DestroyWindow();
    pDoc->m_bAutoDelete = TRUE;

    switch( uiDlgID )
    {
     case IDD_WECLOME:
          bContext.m_pNewViewClass = RUNTIME_CLASS(CEliteWelcomeView);
          break;
     case IDD_ELITEIV:
          bContext.m_pNewViewClass = RUNTIME_CLASS(CEliteIVView);
          break;
     }

    bContext.m_pCurrentDoc = pDoc;
    bContext.m_pNewDocTemplate = NULL;
    bContext.m_pLastView = NULL;
    bContext.m_pCurrentFrame = NULL;

    m_wndSplitter.CreateView(0, 1, bContext.m_pNewViewClass, CSize(200, 50), &bContext);

    m_wndSplitter.RecalcLayout(); 
}

步骤（三）：
在OnInitialUpdate函数中添加代码(CEliteToolView视类是从CTreeView类继承)
void CEliteToolView::OnInitialUpdate()
{
    CTreeView::OnInitialUpdate();
    // TODO: You may populate your TreeView with items by directly accessing
    //  its tree control through a call to GetTreeCtrl().

    GetTreeCtrl().InsertItem("Test First", 0, 0);
    GetTreeCtrl().InsertItem("Test Second", 0, 0);
}

步骤（四）：
重载CEliteToolView视类的TVN_SELCHANDED消息：
void CEliteToolView::OnSelchanged(NMHDR* pNMHDR, LRESULT* pResult) 
{
     NM_TREEVIEW* pNMTreeView = (NM_TREEVIEW*)pNMHDR;
     // TODO: Add your control notification handler code here

     HTREEITEM hTreeItem = GetTreeCtrl().HitTest( pNMTreeView->ptDrag );

     CString strItemText = GetTreeCtrl().GetItemText(hTreeItem);

     if (0xFFFFFFFF != strItemText.Find("Test First", 0))
     {
        ::SendMessage(AfxGetApp()->GetMainWnd()->m_hWnd, WM_CHANGEDVIEW, IDD_WECLOME, 0);
      }

      if (0xFFFFFFFF != strItemText.Find("Test Second", 0))
     {
        ::SendMessage(AfxGetApp()->GetMainWnd()->m_hWnd, WM_CHANGEDVIEW, IDD_ELITEIV, 0);
      }

      *pResult = 0;
}
完成上述几个步骤以后，即可以完成多个视图之间的任意切换