基于对话框的多视图显示

头文件

class CViewCtrl
{
public:
 CViewCtrl(void);
 ~CViewCtrl(void);

 void SwitchToView(CRuntimeClass* pViewClass);

 void SetCtrlParent(CWnd *pParent);
 
 CObList m_listViews;// 所有创建视图的列表

protected:
 CView* GetActiveView() const;

 void SetActiveView(CView* pViewNew, BOOL bNotify = TRUE);

 CView* GetNextView(POSITION& rPosition) const;

private: 
 CWnd *m_pParent;

 CView* m_pViewActive;
};

 

 

cpp文件

CViewCtrl::CViewCtrl(void)
{
 m_pParent = NULL;
 m_pViewActive = NULL;
}

CViewCtrl::~CViewCtrl(void)
{
}

void CViewCtrl::SetCtrlParent(CWnd *pParent)
{
 m_pParent = pParent;
}

void CViewCtrl::SwitchToView(CRuntimeClass* pViewClass)
{
 CView* pView = NULL;
 static UINT nID = AFX_IDW_PANE_FIRST + 1;

 POSITION pos = m_listViews.GetHeadPosition(); //得到第一个视图位置

 while(pView = GetNextView(pos))
 {
  if (pView->IsKindOf(pViewClass))
   break;
 };

 if (pView == NULL)
 {
  CCreateContext *pContext;
  pContext=new CCreateContext;
  pContext->m_pNewViewClass=pViewClass;
  pContext->m_pCurrentDoc=NULL;
  pContext->m_pNewDocTemplate=NULL;
  pContext->m_pLastView=NULL;
  pContext->m_pCurrentFrame=NULL;
  CWnd *pWnd=NULL;
  //创建视图类对象,先从CObject*变换到CWnd*
  pWnd=DYNAMIC_DOWNCAST(CWnd,pViewClass->CreateObject());
  pWnd->Create(NULL,NULL,AFX_WS_DEFAULT_VIEW,CRect(10,10,100,100),m_pParent,nID,pContext);
  delete pContext;

  pView=DYNAMIC_DOWNCAST(CView,pWnd);
  //将新视图添加到视图列表中
  m_listViews.AddTail(pView);
  nID++;
 }

 if (pView->IsKindOf(pViewClass))
 {

  CView* pOldView = NULL;

  if(nID > AFX_IDW_PANE_FIRST + 2)
   pOldView = GetActiveView();

  if (pOldView != pView)
  {
   if (pOldView)
   {
    pOldView->ShowWindow(SW_HIDE);
   }
   
   pView->ShowWindow(SW_SHOW);

   SetActiveView(pView);
   pView->OnInitialUpdate();
  }

 }
}

CView* CViewCtrl::GetNextView(POSITION& rPosition) const
{
 if (rPosition != NULL)
 {
  return (CView *)m_listViews.GetNext(rPosition);
 }
 else
 {
  return NULL;
 }
}

CView* CViewCtrl::GetActiveView() const
{
 ASSERT(m_pViewActive == NULL || m_pViewActive->IsKindOf(RUNTIME_CLASS(CView)));
 return m_pViewActive;
}

void CViewCtrl::SetActiveView(CView *pViewNew, BOOL bNotify)
{
 CView* pViewOld = m_pViewActive;
 if (pViewNew == pViewOld)
  return;

 m_pViewActive = NULL;

 if (pViewOld != NULL)
  pViewOld->SendMessage(WM_ACTIVATE, WA_INACTIVE, 0);

 m_pViewActive = pViewNew;

 if (pViewNew != NULL && bNotify)
  pViewNew->SendMessage(WM_ACTIVATE, WA_ACTIVE, 0);
}