CDocument::AddView

Artykuł
06/10/2015

Wywołanie tej funkcji, aby dołączyć do dokumentu w widoku.

void AddView( 
   CView* pView  
);

Parametry

pView
Punkty do widoku dodawany.

Uwagi

Funkcja ta dodaje określony widok do listy widoków skojarzonych z dokumentu; funkcja ustawia również widoku dokumentu wskaźnik do tego dokumentu.Ramy wywołuje tę funkcję podczas dołączania nowo utworzony widok obiekt do dokumentu. Dzieje się tak w odpowiedzi na polecenie Nowy plik, otwórz plik lub nowe okno lub okno rozdzielacz jest podzielona.

Wywołanie tej funkcji tylko wtedy, gdy są ręczne tworzenie i dołączanie widoku.Zazwyczaj pozwoli ramy połączyć dokumentów i widoków, definiując CDocTemplate powiązania klasy dokumentu, klasy widoku i klasy okna ramki obiektu.

Przykład

// The following example toggles two views in an SDI (single document 
// interface) frame window. A design decision must be made as to 
// whether to leave the inactive view connected to the document, 
// such that the inactive view continues to receive OnUpdate 
// notifications from the document. It is usually desirable to 
// keep the inactive view continuously in sync with the document, even  
// though it is inactive. However, doing so incurs a performance cost, 
// as well as the programming cost of implementing OnUpdate hints. 
// It may be less expensive, in terms of performance and/or programming, 
// to re-sync the inactive view with the document only with it is  
// reactivated. This example illustrates this latter approach, by  
// reconnecting the newly active view and disconnecting the newly  
// inactive view, via calls to CDocument::AddView and RemoveView. 

void CMainFrame::OnViewChange(UINT nCmdID)
// There is an ON_COMMAND_RANGE message map entry associated with 
// OnViewChange: 
// ON_COMMAND_RANGE(ID_VIEW_CHANGE1, ID_VIEW_CHANGE2, &OnViewChange)
{
   CView* pViewAdd;
   CView* pViewRemove;
   CDocument* pDoc = GetActiveDocument();

   // cvView1 and cvView2 are enum members defined in my CMainFrame class 
   if((nCmdID == ID_VIEW_CHANGE1) && (m_currentView == cvView1))
      return;
   if((nCmdID == ID_VIEW_CHANGE2) && (m_currentView == cvView2))
      return;

   if (nCmdID == ID_VIEW_CHANGE2)
   {
      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 = cvView2;
   }
   else
   {
      pViewAdd = m_pView1;
      pViewRemove = m_pView2;
      m_currentView = cvView1;
   }

   // 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();
}