#include "stdafx.h"
#include "SigmaDoc.h"
#include "SigmaView.h"

extern "C" __declspec(dllexport)
int GeoSigma_Undo(CSigmaView * pView, HDC hdc)
{
	if (pView == 0)
		return -1;

	if (pView->m_pDoc == 0)
		return -1;

	CDC * pDC = CDC::FromHandle(hdc);
	pView->SetScreenDC(pDC);
	return pView->m_pDoc->Undo();
}

/**
* ·µ»Ø²Ù×÷ÀàÐÍ
**/
extern "C" __declspec(dllexport)
int GeoSigma_Redo(CSigmaView * pView, HDC hdc)
{
	if (pView == 0)
		return -1;

	if (pView->m_pDoc == 0)
		return -1;

	CDC * pDC = CDC::FromHandle(hdc);
	pView->SetScreenDC(pDC);
	return pView->m_pDoc->Redo();
}

extern "C" __declspec(dllexport)
int GeoSigma_CanUndo(CSigmaView * pView)
{
	if (pView == 0)
		return -1;

	if (pView->m_pDoc == 0)
		return -1;

	if (pView->m_pDoc->CanUndo())
		return 1;

	return -1;
}

extern "C" __declspec(dllexport)
int GeoSigma_CanRedo(CSigmaView * pView)
{
	if (pView == 0)
		return -1;

	if (pView->m_pDoc == 0)
		return -1;

	if (pView->m_pDoc->CanRedo())
		return 1;
	return -1;
}