/***************************************************************
 * Name:      CanvasState.cpp
 * Purpose:   Implements container for stored canvas state
 * Author:    Michal Bližňák (michal.bliznak@tiscali.cz)
 * Created:   2007-07-22
 * Copyright: Michal Bližňák
 * License:   wxWidgets license (www.wxwidgets.org)
 * Notes:
 **************************************************************/

#include "wx_pch.h"

#ifdef _DEBUG_MSVC
#define new DEBUG_NEW
#endif

#include <wx/mstream.h>

#include "wx/wxsf/CanvasState.h"
#include "wx/wxsf/ShapeCanvas.h"

#include <wx/listimpl.cpp>

WX_DEFINE_LIST(StateList);

wxSFCanvasState::wxSFCanvasState(wxStreamBuffer *data)
{
	// copy content of stream buffer to local memory buffer
	if(data)
	{
		data->ResetBuffer();
		m_dataBuffer.AppendData(data->GetBufferStart(), data->GetDataLeft());
		m_dataBuffer.AppendByte(0);
	}

	m_pDataManager = NULL;
}

wxSFCanvasState::wxSFCanvasState(wxSFDiagramManager *data)
{
	wxASSERT(data);

	m_pDataManager = data;
}

wxSFCanvasState::~wxSFCanvasState(void)
{
	if( m_pDataManager)
	{
		delete m_pDataManager;
	}
}

//----------------------------------------------------------------------------------//
// Public functions
//----------------------------------------------------------------------------------//

void wxSFCanvasState::Restore(wxSFShapeCanvas* canvas)
{
    wxASSERT(canvas);
    wxASSERT(canvas->GetDiagramManager());

	if( m_pDataManager )
	{
		// copy content of stored temporal data manager into the currently used one
		canvas->GetDiagramManager()->CopyItems(*m_pDataManager);
		canvas->Refresh(false);
	}
	else
	{
		// create input stream from local memory buffer
		wxMemoryInputStream instream(m_dataBuffer.GetData(), m_dataBuffer.GetDataLen()-1);

		// deserialize canvas content
		if(instream.IsOk() && canvas && canvas->GetDiagramManager())
		{
			// clear all previous canvas content
			canvas->GetDiagramManager()->Clear();
			canvas->GetDiagramManager()->DeserializeFromXml(instream);
			canvas->Refresh(false);
		}
	}
}