A Simple, Action Based, Undo/Redo Framework

/*
***************************************************************************

kis v 1

(c) 2006, Florin DUMITRESCU

mailto: fdproxy@gmail.com

$Workfile: _DemoAction.h $ 

***************************************************************************
*/


#pragma once


//-------------------------------------------------------------------------
/** C_TmpFStream class is a temporary file stream. The file
    is created and opened on construction. On destruction
    the stream is closed and deleted. */
class C_TmpFStream : public std::fstream
{

public:

  C_TmpFStream()
  {
    _CreateTmpFile();
    open( m_FullPath, ios_base::out | ios_base::in );
  }

  C_TmpFStream( const C_TmpFStream& a_Src )
  {
    _CreateTmpFile();
    VERIFY( ::CopyFile( a_Src.m_FullPath, m_FullPath, FALSE ) );
    open( m_FullPath, ios_base::out | ios_base::in );
  }

  ~C_TmpFStream()
  {
    close();
    VERIFY( ::DeleteFile( m_FullPath ) );
  }
  

protected:

  TCHAR m_FullPath[MAX_PATH];

  void _CreateTmpFile()
  {
    TCHAR Path[MAX_PATH];
    VERIFY( GetTempPath( sizeof(Path)/sizeof(Path[0]), Path ) );
    VERIFY( GetTempFileName( Path, _T("kis"), 0, m_FullPath ) );
  }

};


//-------------------------------------------------------------------------
/** C_DemoAction is the base class for all actions in this 
    application. */
class C_DemoAction : public kis::C_Action
{

public:

  C_DemoAction()
  :
  m_RefCount( 0 )
  {
    // nop
  }

  /*override*/ unsigned long AddRef()
  {
    return ++m_RefCount;
  }

  /*override*/ unsigned long Release()
  {
    if ( ! --m_RefCount )
    {
      delete this;
      return 0;
    }
    return m_RefCount;
  }

protected:

  unsigned int m_RefCount;

  /*override*/ ~C_DemoAction()
  {
    // nop
  }

};


//-------------------------------------------------------------------------
/** C_DemoActionWithMouseInput is the base class of all mouse driven
    actions  */
class C_DemoActionWithMouseInput : public C_DemoAction
{

protected:
  
  class CView* m_pView;

  C_DemoActionWithMouseInput( class CView* a_pView );
  C_DemoActionWithMouseInput( const C_DemoActionWithMouseInput& a_Src );

  /*override*/ bool AcquireInput();

  void _DPToHimetric( CPoint* a_pPoint );

  virtual void _OnFirstPoint( const CPoint& a_Point, bool a_Alt ) = 0;
  virtual void _OnNextPoint( const CPoint& a_Point, bool a_Alt ) = 0;
  virtual void _OnLastPoint( const CPoint& a_Point, bool a_Alt ) = 0;
  virtual void _OnCancelled() = 0;

};