MFC中Frame-Splitter-Splitter模型

新建SDI工程，名为ss。
添加4个MFC类，
CLeftView : public CTreeView
CRightFrame : public CFrameWnd
CTopView : public CListView
CBottomView : public CHtmlView

在App类中的ss.h中，添加
CLeftView* m_pLView;
CRightFrame *m_pRFrame;
CTopView    *m_pTView;
CBottomView *m_pBView;

在4个派生类中的构造函数中初始化以上的指针
CTopView::CTopView()
{
    theApp.m_pTView = this;
}
CLeftView::CLeftView()
{
    theApp.m_pLView = this;
}
CRightFrame::CRightFrame()
{
    theApp.m_pRFrame = this;
}
CBottomView::CBottomView()
{
    theApp.m_pBView = this;
}

修改CMainFrame的头文件，添加 CSplitterWnd m_split;    去掉 ChildView 和 cpp中与它相关的代码。

添加代码

BOOL CMainFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
    // TODO:  在此添加专用代码和/或调用基类
    if (!m_split.CreateStatic(this, 1, 2))
        return FALSE;
    m_split.CreateView(0, 0, RUNTIME_CLASS(CLeftView), CSize(150, 0), NULL);
    m_split.CreateView(0, 1, RUNTIME_CLASS(CRightFrame), CSize(0, 0), NULL);
    return TRUE;

//    return CFrameWnd::OnCreateClient(lpcs, pContext);
}

在CRightFrame类的头文件中添加一个分割器变量，CSplitterWnd m_Split;

添加代码

添加以下虚函数
BOOL CRightFrame::OnCreateClient(LPCREATESTRUCT lpcs, CCreateContext* pContext)
{
    // TODO:  在此添加专用代码和/或调用基类
    if (!m_split.CreateStatic(this, 2, 1))
        return FALSE;
    m_split.CreateView(0, 0, RUNTIME_CLASS(CTopView), CSize(0, 300), NULL);
    m_split.CreateView(1, 0, RUNTIME_CLASS(CBottomView), CSize(0, 0), NULL);
    return TRUE;

//    return CFrameWnd::OnCreateClient(lpcs, pContext);
}


BOOL CRightFrame::PreCreateWindow(CREATESTRUCT& cs)
{
    // TODO:  在此添加专用代码和/或调用基类
    CFrameWnd::PreCreateWindow(cs);
    cs.dwExStyle = WS_EX_DLGMODALFRAME;
    return TRUE;

//    return CFrameWnd::PreCreateWindow(cs);
}


void CLeftView::OnInitialUpdate()
{
    CTreeView::OnInitialUpdate();

    // TODO:  在此添加专用代码和/或调用基类
    CTreeCtrl& tree = GetTreeCtrl();
    if (tree.GetChildItem(NULL))
        return;
    ModifyStyle(0, TVS_HASLINES | TVS_HASBUTTONS | TVS_SHOWSELALWAYS | TVS_LINESATROOT);
    HTREEITEM hItem = tree.InsertItem(L"Outlook Express");
    tree.InsertItem(_T("收件箱"), hItem);
    tree.InsertItem(_T("发件箱"), hItem);
    tree.InsertItem(_T("已发送邮件"), hItem);
    tree.InsertItem(_T("已删除邮件"), hItem);
    tree.InsertItem(_T("草稿"), hItem);
    tree.Expand(hItem, TVE_EXPAND);
}

void CTopView::OnInitialUpdate()
{
    CListView::OnInitialUpdate();

    // TODO:  在此添加专用代码和/或调用基类
    if (GetStyle() & LVS_REPORT)
        return;
    ModifyStyle(0, LVS_REPORT | LVS_SHOWSELALWAYS);
    CListCtrl& list = GetListCtrl();
    list.SetExtendedStyle(LVS_EX_FULLROWSELECT);
    list.InsertColumn(0, _T("发件人"), 0, 200);
    list.InsertColumn(1, _T("主题"), 0, 200);
    list.InsertColumn(2, _T("发送时间"), 0, 200);
    list.InsertItem(0, _T("Microsoft Outlook Express 开发组"));
    list.SetItemText(0, 1, _T("欢迎使用 Outlook Express 6"));
    list.SetItemText(0, 2, _T("2019-10-24"));
}


void CTopView::OnLvnItemchanged(NMHDR *pNMHDR, LRESULT *pResult)
{
    LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
    // TODO:  在此添加控件通知处理程序代码
    HD_NOTIFY* p = (HD_NOTIFY*)pNMHDR;
    CListCtrl& list = GetListCtrl();
    CString str = _T("about:blank");
    if (list.GetSelectedCount())
    {
        TCHAR s[64] = { 0 };
        ::GetWindowsDirectory(s, sizeof(s) / sizeof(s[0]));
        str.Format(_T("file://%s/web/tip.htm"), s);
    }
    //str = _T("https://baidu.com");
    theApp.m_pBView->Navigate2(str, NULL, NULL);

    *pResult = 0;
}

结果：