用向导创建的单文档视图程序,再增加几个视图如何与文档联系起来,就像多文档视图那样.

Question

也就是把单文档变成能够具有多文档的功能,使用单文档与多个视图进行数据的通信连接存储,该怎么解决????

Answer 1

单文档与多个视图连接存储充分的体现了doc/view的优点。也就是说一份数据，可以使用多种方式表现给用户看。视图有多个，文档类型只有一个这和多文档是不一样的，多文档里面可以有多个Document

Answer 2

CDocument::AddView()
CView::GetDocument()

Answer 3

void CMainFrame::OnViewChange(UINT nCmdID)
{        CView* pViewAdd=NULL;
         CView* pViewRemove=NULL;
  
         CDocument* pDoc = GetActiveDocument();
   
         if((nCmdID == IDM_VIEW_0) && (m_currentView == 0))
         return;
         if((nCmdID == IDM_VIEW_1) && (m_currentView == 1))
         return;
         if((nCmdID == IDM_VIEW_2) && (m_currentView == 2))
         return;
         if(nCmdID == IDM_VIEW_1)
           {
           if (m_pView1 == NULL)
       {
                m_pView0 = (CTest001View*)GetActiveView();
                m_pView1 = new CTest001View1;
                m_pView1->MyCreate(NULL, NULL, AFX_WS_DEFAULT_VIEW,
                rectDefault, this, AFX_IDW_PANE_FIRST + 1, NULL);        
               }
           if(m_pLastView==NULL)
              {
        m_pLastView=m_pView;
              }
          else
              { 
        pViewRemove=m_pLastView;
              }                pViewRemove = m_pLastView;
                pViewAdd = m_pView1;
                m_currentView= 1;
                m_pLastView=m_pView1;
              }
      else if(nCmdID == IDM_VIEW_2)
         {
 
 if (m_pView2 == NULL)
     {
              m_pView = (CTest001View*)GetActiveView();
              m_pView2 = new CTest001View2;
              m_pView2->MyCreate(NULL, NULL, AFX_WS_DEFAULT_VIEW,
              rectDefault, this, AFX_IDW_PANE_FIRST + 1, NULL);              }
if(m_pLastView==NULL)
    { 
m_pLastView=m_pView;
    }
else
    {
pViewRemove=m_pLastView;
    }
    pViewRemove=m_pLastView;
            pViewAdd = m_pView2;
            m_currentView= 2;
            m_pLastView=m_pView2;
      }
 
      else if(nCmdID == IDM_VIEW_0)
          {
          m_pView = (CTest001View*)GetActiveView();
          m_pView2 = new CTest001View2;
          m_pView2->MyCreate(NULL, NULL, AFX_WS_DEFAULT_VIEW,
              rectDefault, this, AFX_IDW_PANE_FIRST + 1, NULL);               if(m_pLastView==NULL)
  { 
m_pLastView=m_pView;
  }
else
  {
pViewRemove=m_pLastView;
  }          pViewRemove = m_pLastView;
          pViewAdd = m_pView0;
          m_currentView= 0;
          m_pLastView=m_pView0;
  
         }
      else
      return;      int nSwitchChildID = pViewAdd->GetDlgCtrlID();
      pViewAdd->SetDlgCtrlID(AFX_IDW_PANE_FIRST);
      pViewRemove->SetDlgCtrlID(nSwitchChildID);      pViewAdd->ShowWindow(SW_SHOW);
      pViewRemove->ShowWindow(SW_HIDE);      pDoc->AddView(pViewAdd);
      pDoc->RemoveView(pViewRemove);      SetActiveView(pViewAdd);
      RecalcLayout();}

Answer 4

上面发的是3视图切换
这是2视图切换（MSDN上有）
BOOL CMainFrame::OnViewChange(UINT nCmdID)
// There is an ON_COMMAND_RANGE message map entry associated with
// OnViewChange:
// ON_COMMAND_RANGE( ID_VIEW_VIEW1, ID_VIEW_VIEW2, OnViewChange)
{
 CView* pViewAdd;
 CView* pViewRemove;
 CDocument* pDoc = GetActiveDocument(); if((nCmdID == ID_VIEW_VIEW1) && (m_currentView == 1))
    return;
 if((nCmdID == ID_VIEW_VIEW2) && (m_currentView == 2))
   return; if (nCmdID == ID_VIEW_VIEW2)
 {
  if (m_pView2 == NULL)
  {
   m_pView1 = GetActiveView();
   m_pView2 = new CMyView2;//Note that if OnSize has been overridden in CMyView2 
//and GetDocument() is used in this override it can 
//cause assertions and, if the assertions are ignored,
//cause access violation.
  
   m_pView2->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
      rectDefault, this, AFX_IDW_PANE_FIRST + 1, NULL);
  }
   pViewAdd = m_pView2;
   pViewRemove = m_pView1;
   m_currentView= 2;
 }
 else
 {
  pViewAdd = m_pView1;
  pViewRemove = m_pView2;
  m_currentView= 1;
 }
     
// Set the child i.d. of the active view to AFX_IDW_PANE_FIRST,
// so that CFrameWnd::RecalcLayout will allocate to this 
// "first pane" that portion of   the frame window's client area 
// not allocated to control   bars.  Set the child i.d. of the 
// other view to anything other than AFX_IDW_PANE_FIRST; this
// examples switches the child id's of the two views. int nSwitchChildID = pViewAdd->GetDlgCtrlID();
 pViewAdd->SetDlgCtrlID(AFX_IDW_PANE_FIRST);
 pViewRemove->SetDlgCtrlID(nSwitchChildID); // Show the newly active view and hide the inactive view. pViewAdd->ShowWindow(SW_SHOW);
 pViewRemove->ShowWindow(SW_HIDE); // Connect the newly active view to the document, and
 // disconnect the inactive view.
 pDoc->AddView(pViewAdd);
 pDoc->RemoveView(pViewRemove); SetActiveView(pViewAdd);
 RecalcLayout();
}