// NumEdit.cpp : implementation file

#include "stdafx.h"
#include "NumEdit.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CNumEdit

CNumEdit::CNumEdit()
{
}

CNumEdit::~CNumEdit()
{
}

BEGIN_MESSAGE_MAP(CNumEdit, CEdit)
	//{{AFX_MSG_MAP(CNumEdit)
	ON_WM_CHAR()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CNumEdit message handlers

void CNumEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	CString text;

	if (nChar == 8)
		CEdit::OnChar(nChar, nRepCnt, nFlags);
	if (nChar == 3)
		CEdit::Copy();
	if (nChar == 24)
		CEdit::Cut();
	if (nChar == 26)
		CEdit::Undo();
	if (nChar == 22)
		CEdit::Paste();
	
	POINT caret;
	::GetCaretPos (&caret);
	caret.x = LOWORD (CharFromPos (caret));
	
	GetWindowText (text);
	
	if (isdigit(nChar)) 
		CEdit::OnChar(nChar, nRepCnt, nFlags);
	else if (nChar == '-')	{
		if (!caret.x){
			if (((text.GetLength() > 0) && (text[0]!='-')) || (text.GetLength()==0))
				CEdit::OnChar(nChar, nRepCnt, nFlags);
		} else 	{
			TCHAR cc=text.GetAt(caret.x-1);
			if (( cc == 'e') || (cc == 'E'))
				CEdit::OnChar(nChar, nRepCnt, nFlags);
		}
	} else if ((nChar == 'e') || (nChar == 'E')){
		if ((caret.x == 1) && (text[0] == '-'))
			return ;
		if (caret.x){
			for (int i=0; i<text.GetLength(); i++)	{
				TCHAR cc=text[i];
				if ((cc == 'e') ||(cc == 'E'))
					return ;
			}
			CEdit::OnChar(nChar, nRepCnt, nFlags);
		}
	}else if (nChar == '.')	{
		for (int i=0; i<text.GetLength(); i++)	{
			TCHAR cc=text[i];
			if (cc == '.')
				return ;
		}
		for (i=0; i<text.GetLength(); i++)	{
			TCHAR cc = text[i];
			if (((cc == 'e') ||(cc=='E')) && (caret.x > i))
				return ;
		}
		CEdit::OnChar(nChar, nRepCnt, nFlags);
	}
}

void CNumEdit::SetValue(double val)
{
	CString tmp;
	tmp.Format (_T("%G"),val);
	SetWindowText(tmp);
}

double CNumEdit::GetValue()
{
	CString tmp;
	GetWindowText(tmp);
	return _tcstod(tmp,NULL);
}