采用多重继承模仿文档视图结构

1. 数据类#include <list>class IJxInterface;class CJxDataSet : public CCmdTarget{ DECLARE_DYNCREATE(CJxDataSet) CJxDataSet(); // protected constructor used by dynamic creation bool LinkInterface(IJxInterface* pInterface_); bool DelinkInterface(IJxInterface* pInterface_); bool UpdateAllInterfaces();protected: virtual ~CJxDataSet(); std::list<IJxInterface*> m_views; DECLARE_MESSAGE_MAP()}; #include "DataSet.h"#include "IJxInterface.h"#include <algorithm>#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE[] = __FILE__;#endifusing namespace std;/////////////////////////////////////////////////////////////////////////////// CJxDataSetIMPLEMENT_DYNCREATE(CJxDataSet, CCmdTarget)static void Delink(IJxInterface* _pInf){ ASSERT(_pInf); if (_pInf) _pInf->DelinkToDataset();}CJxDataSet::CJxDataSet(){}CJxDataSet::~CJxDataSet(){ for_each(m_views.begin(), m_views.end(), Delink);}BEGIN_MESSAGE_MAP(CJxDataSet, CCmdTarget)END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CJxDataSet message handlersbool CJxDataSet::LinkInterface(IJxInterface* pInterface_){ ASSERT(pInterface_); m_views.push_back(pInterface_); return true;}bool CJxDataSet::DelinkInterface(IJxInterface* pInterface_){ if(pInterface_) { m_views.remove(pInterface_); pInterface_->DelinkToDataset(); return true; } return false;}static void UpdateOneInterface(IJxInterface* pInterface_){ ASSERT(pInterface_); pInterface_->OnRefreshByDatasete();}bool CJxDataSet::UpdateAllInterfaces(){ if (m_views.empty()) return false; for_each(m_views.begin(), m_views.end(), UpdateOneInterface); return true;}2.界面类#include "DataSet.h"class IJxInterface {public: IJxInterface(); virtual ~IJxInterface(); virtual void OnRefreshByDatasete() = 0; void LinkToDataset(CJxDataSet* pDataset_); CJxDataSet* GetDataSet(){return m_pDataset;} void DelinkToDataset() { ASSERT(m_pDataset); if (m_pDataset) m_pDataset->DelinkInterface(this); m_pDataset = NULL; }protected: CJxDataSet* m_pDataset;}; IJxInterface::IJxInterface(){ m_pDataset = NULL;}IJxInterface::~IJxInterface(){ if (m_pDataset) m_pDataset->DelinkInterface(this);}void IJxInterface::LinkToDataset(CJxDataSet* pDataset_){ ASSERT(pDataset_); m_pDataset = pDataset_;}3.粘合类class CJxDataSet;class IJxInterface;class IJxDataInfConnector {public: IJxDataInfConnector(); virtual ~IJxDataInfConnector(); bool ConnectDataInf(CJxDataSet* pDataSet_, IJxInterface* pInf_);}; IJxDataInfConnector::IJxDataInfConnector(){}IJxDataInfConnector::~IJxDataInfConnector(){}bool IJxDataInfConnector::ConnectDataInf(CJxDataSet* pDataSet_, IJxInterface* pInf_){ ASSERT(pInf_); ASSERT(pDataSet_); if (!pInf_ || !pDataSet_) return false; if (pInf_->GetDataSet()) return false; pDataSet_->LinkInterface(pInf_); pInf_->LinkToDataset(pDataSet_); return true;} 4 具体应用类class CMyDataSet : public CJxDataSet {public: CMyDataSet(); virtual ~CMyDataSet(); int m_a;protected: DECLARE_MESSAGE_MAP() afx_msg void OnMyCmd();};BEGIN_MESSAGE_MAP(CMyDataSet, CJxDataSet) ON_COMMAND(WM_MYCMD, OnMyCmd)END_MESSAGE_MAP()CMyDataSet::CMyDataSet(){ m_a = 1;}CMyDataSet::~CMyDataSet(){}void CMyDataSet::OnMyCmd(){ m_a++; UpdateAllInterfaces();} class CMainFrame : public CFrameWnd, public IJxDataInfConnector{ public: CMainFrame();protected: DECLARE_DYNAMIC(CMainFrame)public: CMyDataSet* m_pDataSet;public: virtual BOOL PreCreateWindow(CREATESTRUCT& cs); virtual BOOL OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo);public: virtual ~CMainFrame();#ifdef _DEBUG virtual void AssertValid() const; virtual void Dump(CDumpContext& dc) const;#endifprotected: // control bar embedded members CStatusBar m_wndStatusBar; CToolBar m_wndToolBar; CChildView m_wndView;protected: afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct); afx_msg void OnSetFocus(CWnd *pOldWnd); DECLARE_MESSAGE_MAP()};CMainFrame::CMainFrame(){ m_pDataSet = new CMyDataSet; ConnectDataInf(m_pDataSet, &m_wndView); } CMainFrame::~CMainFrame(){ delete m_pDataSet; m_pDataSet = NULL;}void CMainFrame::OnSetFocus(CWnd* pOldWnd){ m_wndView.SetFocus();}BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo){ if (m_wndView.OnCmdMsg(nID, nCode, pExtra, pHandlerInfo)) return TRUE; if (m_pDataSet && m_pDataSet->OnCmdMsg(nID, nCode, pExtra, pHandlerInfo)) return TRUE; return CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo);} class CChildView : public CWnd, public IJxInterface{public: CChildView();public: virtual void OnRefreshByDatasete(); protected: virtual BOOL PreCreateWindow(CREATESTRUCT& cs);public: virtual ~CChildView();protected: afx_msg void OnPaint(); afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point); DECLARE_MESSAGE_MAP()};BEGIN_MESSAGE_MAP(CChildView,CWnd ) //{{AFX_MSG_MAP(CChildView) ON_WM_PAINT() ON_WM_LBUTTONDBLCLK() //}}AFX_MSG_MAPEND_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////// CChildView message handlersBOOL CChildView::PreCreateWindow(CREATESTRUCT& cs) { if (!CWnd::PreCreateWindow(cs)) return FALSE; cs.dwExStyle |= WS_EX_CLIENTEDGE; cs.style &= ~WS_BORDER; cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS, ::LoadCursor(NULL, IDC_ARROW), HBRUSH(COLOR_WINDOW+1), NULL); return TRUE;}void CChildView::OnPaint() { CPaintDC dc(this); if (m_pDataset) { int _n = ((CMyDataSet*)m_pDataset)->m_a; CString _str; _str.Format("Hello, %d", _n); dc.TextOut(10, 10, "双击我"); dc.TextOut(100, 100, _str); }}void CChildView::OnRefreshByDatasete(){ InvalidateRect(NULL);}void CChildView::OnLButtonDblClk(UINT nFlags, CPoint point){ AfxGetMainWnd()->SendMessage(WM_COMMAND, WM_MYCMD, 0L);}