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Undo and Redo the "Easy" Way

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20 Jun 2004CPOL22 min read 289.8K   8.6K   114  
This article introduces a simple approach to in-memory transactions that can be used to implement Undo and Redo. The technique uses SEH and Virtual Memory and requires only STL and Win32.
// MainFrm.h : interface of the CMainFrame class
//
/////////////////////////////////////////////////////////////////////////////

#if !defined(AFX_MAINFRM_H__6A1DE0A2_2DF1_4113_B9C6_1A1442424414__INCLUDED_)
#define AFX_MAINFRM_H__6A1DE0A2_2DF1_4113_B9C6_1A1442424414__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000

class CMainFrame : public CFrameWnd
{
	
protected: // create from serialization only
	CMainFrame();
	DECLARE_DYNCREATE(CMainFrame)

// Attributes
public:

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CMainFrame)
	virtual BOOL PreCreateWindow(CREATESTRUCT& cs);
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual ~CMainFrame();
#ifdef _DEBUG
	virtual void AssertValid() const;
	virtual void Dump(CDumpContext& dc) const;
#endif

protected:  // control bar embedded members
	CStatusBar  m_wndStatusBar;
	CToolBar    m_wndToolBar;

// Generated message map functions
protected:
	//{{AFX_MSG(CMainFrame)
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_MAINFRM_H__6A1DE0A2_2DF1_4113_B9C6_1A1442424414__INCLUDED_)

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License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
United States United States
A compiler warns of bogasity, ignore it at your peril. Unless you've done the compiler's job yourself, don't criticize it.

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