A Simple, Action Based, Undo/Redo Framework

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

kis v 1

(c) 2006, Florin DUMITRESCU

mailto: fdproxy@gmail.com

$Workfile: _DemoAction_AddRandomSegment.cpp $ 

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


#include "StdAfx.h"
#include "_Factory.h"
#include "_Graphic.h"
#include "KisActionDemoDoc.h"
#include "_DemoAction.h"
#include "Resource.h"
#include "MainFrm.h"


using namespace kis;


namespace
{


class C_DemoAction_AddRandomSegment : public C_DemoAction
{

public:
  C_DemoAction_AddRandomSegment( CKisActionDemoDoc* a_pDoc )
  :
  m_pDoc( a_pDoc ),
  m_Idx( -1 )
  {
    // nop
  }

  C_DemoAction_AddRandomSegment( const C_DemoAction_AddRandomSegment& a_Src )
  :
  m_pDoc( a_Src.m_pDoc ),
  m_Idx( a_Src.m_Idx ),
  m_Segment( a_Src.m_Segment )
  {
    // nop
  }

  /*override*/ SP_Action Clone() const
  {
    return SP_Action( new C_DemoAction_AddRandomSegment( *this ) );
  }

  /*override*/ bool IsUnexecutable() const
  {
    return true;
  }

  /*override*/ bool IsNull() const
  {
    return m_Segment.IsEmpty();
  }

  /*override*/ bool HasInput() const
  {
    return ! m_Segment.IsEmpty();
  }

  /*override*/ bool AcquireInput()
  {
    while ( m_Segment.IsEmpty() )
    {
      m_Segment.SetStartPoint( CPoint( rand() % 10000, -rand() % 10000 ) );
      m_Segment.SetEndPoint( CPoint( rand() % 10000, -rand() % 10000 ) );
    }
    return true;
  }

  /*override*/ bool Execute()
  {
    m_Idx = m_pDoc->m_Drawing.Add( m_Segment );
    m_pDoc->UpdateAllViews( 0 );
    return true;
  }

  /*override*/ bool HasUnexecute() const
  {
    return m_Idx != -1;
  }

  /*override*/ void Unexecute()
  {
    ASSERT( m_Idx != -1 );
    m_pDoc->m_Drawing.RemoveAt( m_Idx );
  }

  /*override*/ bool HasReexecute() const
  {
    return m_Idx != -1;
  }

  /*override*/ void Reexecute()
  {
    int Idx = m_pDoc->m_Drawing.Add( m_Segment );
    ASSERT( Idx == m_Idx );
  }

  /*override*/ void GetName( unsigned char* a_Name, const unsigned char a_MaxNameLen ) const
  {
    CString Name;
    Name.Format
      ( 
      IDS_ACTION_ADD_SEGMENT_P1_P2, 
      double(m_Segment.GetStartPoint().x) / 100., 
      - double(m_Segment.GetStartPoint().y) / 100.,
      double(m_Segment.GetEndPoint().x) / 100., 
      - double(m_Segment.GetEndPoint().y) / 100.
      );
    _tcsncpy( reinterpret_cast<TCHAR*>(a_Name), Name, (a_MaxNameLen - 1) / sizeof( TCHAR ) );
  }

  /*override*/ unsigned int GetBytesCount() const
  {
    return sizeof( *this );
  }

protected:
  CKisActionDemoDoc* m_pDoc;
  C_Graphic_Segment m_Segment;
  unsigned int m_Idx;

  /*override*/ ~C_DemoAction_AddRandomSegment()
  {
    // nop
  }
};


} // namespace


SP_Action C_Factory::CreateAction_AddRandomSegment( CKisActionDemoDoc* a_pDoc )
{
  return SP_Action( new C_DemoAction_AddRandomSegment( a_pDoc ) );
}