视图切换

一、SDI

1、into mainframe.h add member

int m_currentView;
 CView2* m_pView2;
 CView1* m_pView1;

 

2、in InitInstance()

((CMainFrame*)m_pMainWnd)->m_pView1=(CView1*)(((CMainFrame*)m_pMainWnd)->GetActiveView());

3、add message handler

in head file

afx_msg void OnViewChange(UINT nCmdID);

in cpp file

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)
 //{{AFX_MSG_MAP(CMainFrame)
 ON_COMMAND_RANGE(IDM_VIEW1,IDM_VIEW2, OnViewChange)
 //}}AFX_MSG_MAP
END_MESSAGE_MAP()

CMainFrame::CMainFrame()
{
 // TODO: add member initialization code here
 m_pView2=NULL;
 m_currentView=1;
}

void CMainFrame::OnViewChange(UINT nCmdID)
{
 // TODO: Add your command handler code here

 CView* pViewAdd;
 CView* pViewRemove;
 CDocument* pDoc = GetActiveDocument();
   
 if((nCmdID == IDM_VIEW1) && (m_currentView == 1))
   return;
 if((nCmdID == IDM_VIEW2) && (m_currentView == 2))
  return;

 if (nCmdID == IDM_VIEW2)
 {
  if (m_pView2 == NULL)
  {
   m_pView1 = (CView1*)GetActiveView();
   m_pView2 = new CView2;

// 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 violations.
 
   m_pView2->MyCreate(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 identifier of the active view to AFX_IDW_PANE_FIRST,
// so that CFrameWnd::RecalcLayout will allocate to this
// first pane, that portion in a client area of the frame window that is
// not allocated to control bars. Set the child identifier of the
// other view to anything besides AFX_IDW_PANE_FIRST; this
// example switches the child identifiers 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();

}

 

void CView2::MyCreate(LPCTSTR lpszClassName, LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect, CWnd* pParentWnd, UINT nID, CCreateContext* pContext)
{
 CFormView::Create(lpszClassName, lpszWindowName, dwStyle,
  rect, pParentWnd, nID, pContext);
}

Don not fetget edit menu resource。

I make mfc sdi project by default setting,  in step 6 CView1  derived from CFormView

and insert dialog with child , border none style,then add CView2 into project。

二、MDI

is similarly with sdi

the replaceview() function u could found in msdn but not the same

I don not destroy view and recreate view.

now i ctr+v the core code

mainframe.cpp

BOOL CMainFrame::ReplaceView(CView* pNewView )
{
 
   CMDIFrameWnd* pMainWnd = (CMDIFrameWnd*)AfxGetMainWnd();

   // Get the active MDI child window.
   CMDIChildWnd* pChild = (CMDIChildWnd*)pMainWnd->MDIGetActive();

   // Get the active view attached to the active MDI child window.
   CView* pOldActiveView = pChild->GetActiveView();
   // Set flag so that document will not be deleted when view is dettached.
   CDocument * pDoc= pOldActiveView->GetDocument();

 
    BOOL bAutoDelete=pDoc->m_bAutoDelete;
            
   pDoc->m_bAutoDelete = FALSE;

   // Dettach existing view
   pDoc->RemoveView(pOldActiveView);

   // restore flag
   pDoc->m_bAutoDelete = bAutoDelete;
 
  
 
   // Show the newly active view and hide the inactive view.
   pNewView->ShowWindow(SW_SHOW);
   pOldActiveView->ShowWindow(SW_HIDE);

   // Attach new view
   pDoc->AddView(pNewView);
 
   pChild->RecalcLayout();
   pNewView->UpdateWindow();
   pChild->SetActiveView(pNewView);
   return true;

 

}

void CMainFrame::OnViewChange(UINT nID)
{
 // TODO: Add your command handler code here
 switch( nID)
{
case IDM_VIEW1:      
 ReplaceView(m_pView1);
 break;
case IDM_VIEW2:
   CMainFrame* pMainWnd = (CMainFrame*)AfxGetMainWnd();
   // Get the active MDI child window.
   CMDIChildWnd* pChild = (CMDIChildWnd*)pMainWnd->MDIGetActive();

   if (!m_pView2)
   {
   // create the new view
   m_pView2 = new CView2;
   m_pView2->MyCreate(NULL, NULL, AFX_WS_DEFAULT_VIEW, CRect(0, 0, 0, 0),
                   pChild, AFX_IDW_PANE_FIRST, NULL);
}

 

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