VC-编辑数字的文本框CNumberEdit（code）

NumberEdit.h

 

#ifndef __NUMBEREDIT_H__

#define __NUMBEREDIT_H__

 

 

class CNumberEdit : public CEdit

{

 

public:

       CNumberEdit();

       virtual ~CNumberEdit();

       void SetAfterDotLen(UINT iAfterDotLen){m_iAfterDotLen =iAfterDotLen;}

       UINT GetAfterDotLen(){return m_iAfterDotLen;}

      

protected:

       BOOL CheckNumber(UINT nChar,UINT nRepCnt,UINT nFlags);

       //BOOL CheckOnePlus(UINT nChar,UINT nRepCnt,UINT nFlags);

       BOOL CheckOneMinus(UINT nChar,UINT nRepCnt,UINT nFlags);

       BOOL CheckOneDot(UINT nChar,UINT nRepCnt,UINT nFlags);        

       int GetCaretXPos(); 

       CString m_str;

       UINT m_iAfterDotLen;

 

protected:

       //{{AFX_MSG(CUntcNumberEdit)

       afx_msg void OnChar(UINT nChar, UINT nRepCnt, UINT nFlags);

       afx_msg void OnKillfocus();

       //}}AFX_MSG

 

       DECLARE_MESSAGE_MAP()

};

 

#endif

 

NumberEdit.cpp

 

#include "stdafx.h"

#include "NumberEdit.h"

      

CNumberEdit::CNumberEdit()

{

       m_iAfterDotLen = 2;

       m_str = _T("0.00"); 

}

 

CNumberEdit::~CNumberEdit()

{

}

 

 

BEGIN_MESSAGE_MAP(CNumberEdit, CEdit)

       //{{AFX_MSG_MAP(CNumberEdit)

       ON_WM_CHAR()

       ON_CONTROL_REFLECT(EN_KILLFOCUS, OnKillfocus)

       //}}AFX_MSG_MAP

END_MESSAGE_MAP()

 

void CNumberEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)

{

       // TODO: Add your message handler code here and/or call default

       if(nChar == 8)

       {

              CEdit::OnChar(nChar, nRepCnt, nFlags);

              return;

       }

 

       BOOL bChange = FALSE;

       GetWindowText(m_str);

      

       if(CheckNumber(nChar,nRepCnt,nFlags))

       {

              bChange = TRUE;

       }

       //else if(CheckOnePlus(nChar,nRepCnt,nFlags))

       //{   

       //     ;//do nothing

       //}

       else if(CheckOneMinus(nChar,nRepCnt,nFlags))

       {

              bChange = TRUE;

       }

       else if(CheckOneDot(nChar,nRepCnt,nFlags))

       {

              bChange = TRUE;

       }

       if(bChange)

       {

              CEdit::OnChar(nChar, nRepCnt, nFlags);

              //SetFormatText();

              //m_Point.x += m_Point.y*6;

              //SetCaretPos(m_Point);

       }

}

 

void CUntcNumberEdit::OnKillfocus()
{ 
 GetWindowText(m_str);

 int iLoop = m_iAfterDotLen;
 if(m_str.IsEmpty()) 
 {
  m_str = "0.";
 }
 else if(m_str.GetLength() == 1 && m_str[0] == TCHAR('-'))
 {
  m_str = "0.";
 }
 else
 {
  int iDotPos = m_str.Find(TCHAR('.'));
  if(iDotPos == 0)
   m_str = "0"+ m_str;
  else if(iDotPos <0)
   m_str+=".";

  iDotPos = m_str.Find(TCHAR('.'));  
  int iLen = m_str.GetLength() - 1 - iDotPos;  
  iLoop = (int)m_iAfterDotLen - iLen;
  
 }
 if(iLoop >= 0)
 {
  for(int i=0;i<iLoop;i++)
   m_str+="0";
 }
 else
 {
  m_str = m_str.Mid(0,m_str.GetLength()+iLoop);
 }

 SetWindowText(m_str); 
}

 

BOOL CNumberEdit::CheckNumber(UINT nChar,UINT nRepCnt,UINT nFlags)

{

       if(::isdigit(nChar)==0)

              return FALSE;

      

       int iDotPos = m_str.Find(TCHAR('.'));

       if(iDotPos >= 0)

       {

              int iLen = m_str.GetLength() - 1 - iDotPos;

              if( (GetCaretXPos() >= iDotPos) && (iLen >= (int)m_iAfterDotLen))

              {

                     return FALSE;

              }

       }

 

       return TRUE;

}

 

BOOL CNumberEdit::CheckOneMinus(UINT nChar,UINT nRepCnt,UINT nFlags)

{

       if(nChar != '-')

              return FALSE;

 

       if(GetCaretXPos() != 0)

              return FALSE;

      

       if(!m_str.IsEmpty() && m_str.GetAt(0) == TCHAR('-'))                 

              return FALSE;

             

       return TRUE; 

}

 

BOOL CNumberEdit::CheckOneDot(UINT nChar,UINT nRepCnt,UINT nFlags)

{

       if(nChar != '.')

              return FALSE;

 

       if(m_str.Find(TCHAR('.')) >=0)

              return FALSE;

      

       int iPos = GetCaretXPos();

       if(iPos == 0)

              return FALSE;

       else if(iPos==1 && m_str[0] == TCHAR('-'))

              return FALSE;

 

       return TRUE;

}

 

int CNumberEdit::GetCaretXPos()

{

       CPoint p = GetCaretPos();  

       return (p.x - p.y)/6;

}