CEdit控件对输入参数的控制，包括右键面板及快捷键的处理

#include "stdafx.h"

#include "NumEdit.h"

#define VK_CTRL_X 0x18

#define VK_CTRL_C 0x03

#define VK_CTRL_V 0x16

// CNumEdit

IMPLEMENT_DYNAMIC(CNumEdit, CEdit)

CNumEdit::CNumEdit()

{

m_strValue = _T("");

m_nMaxValue = 0;

m_nMinValue = 0;

}

CNumEdit::~CNumEdit()

{

}

BEGIN_MESSAGE_MAP(CNumEdit, CEdit)

ON_WM_CHAR()

END_MESSAGE_MAP()

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

{

int nCurserPos = 0;

if ((nChar>='0'&&nChar<='9')|| VK_BACK==nChar)

{

GetWindowText( m_strValue );

CString str;

int nLen = 0;

int nBegin = 0;

int nEnd = 0;

GetSel( nBegin, nEnd );

nLen = m_strValue.GetLength();

if( VK_BACK == nChar )

{

str = m_strValue;

m_strValue = m_strValue.Left(nBegin -1 );

m_strValue +=str.Right(nLen-nBegin);

nCurserPos= nBegin-1;

}

else

{

if( nBegin == nEnd )

{

if( nBegin == nLen )

{

m_strValue +=(char)nChar;

nCurserPos = nLen+1;

}

else

{

m_strValue.Insert( nBegin, (char)nChar );

nCurserPos= nBegin +1;

}

}

else

{

for( int nIndex = 0; nIndex< nBegin; nIndex++ )

{

str+=m_strValue.GetAt(nIndex);

}

str +=(char)nChar;

for( int nIndex = nEnd; nIndex <nLen; nIndex++ )

{

str+=m_strValue.GetAt(nIndex);

}

m_strValue = str;

nCurserPos= nBegin +1;

}

int nCurLen = 0;

nCurLen = m_strValue.GetLength();

str.Format("%d", m_nMaxValue );

nLen = str.GetLength();

if( nCurLen> nLen )

{

m_strValue = m_strValue.Left( nLen );

}

nCurLen = memcmp( str, m_strValue, nLen );

if( nCurLen< 0 )

{

m_strValue = m_strValue.Left(nLen-1);

}

}

SetWindowText( m_strValue );

SetSel(nCurserPos , nCurserPos );

}

if( nChar== VK_CTRL_C || nChar==VK_CTRL_V || nChar==VK_CTRL_X )

{

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

}

}

void CNumEdit::SetValueRang( unsigned int nMinValue, unsigned int nMaxValue )

{

m_nMaxValue = nMaxValue;

m_nMinValue = nMinValue;

}

//此处为对右键面板和快捷键的剪切复制粘贴的处理，为对话框EDIT控件onupdate消息响应的调用

注意此处函数 SetWindowText( strValue );每次只能调用一次，否则程序会崩溃掉，故下面代码做了相应的处理

void CNumEdit::AnalysValue()

{

BOOL bCutStr = FALSE;

CString strValue;

GetWindowText( strValue );

int nCmpRtn = 0;

char chValue = '\0';

int nIndex = 0;

int nLeng = 0;

nLeng = strValue.GetLength();

CString strMaxValue;

strMaxValue.Format( "%d", m_nMaxValue );

int nMaxLen = 0;

nMaxLen = strMaxValue.GetLength();

if( nMaxLen< nLeng )

{

nLeng = nMaxLen;

strValue = strValue.Left( nLeng );

bCutStr = TRUE;

}

while( nIndex < nLeng )

{

chValue = strValue.GetAt( nIndex++ );

if( chValue>='0'&& chValue <= '9')

{

continue;

}

else

{

break;

}

}

if( nIndex == nLeng )

{

if( nLeng == nMaxLen )

{

nCmpRtn = memcmp( strMaxValue, strValue, nLeng );

if( nCmpRtn< 0 )

{

strValue = strValue.Left( nLeng-1 );

SetWindowText( strValue );

}

else

{

if( bCutStr )

{

SetWindowText( strValue );

nIndex = strValue.GetLength();

SetSel( nIndex, nIndex );

}

}

}

else

{

if( bCutStr )

{

SetWindowText( strValue );

nIndex = strValue.GetLength();

SetSel( nIndex, nIndex );

}

}

}

else

{

nIndex--;

strValue = strValue.Left( nIndex );

if( strValue=="" )

{

strValue = m_strValue;

}

SetWindowText( strValue );

nIndex = strValue.GetLength();

SetSel( nIndex, nIndex );

}

m_strValue = strValue;

}

GetSel( nBegin, nEnd );

为得到当前光标所在文本框的位置，若选中对话框中的某字符串时，nBegin为选中字符串的第一个位置，nEnd为选中字符串的后一个位置，若没有选中字符串时，nBegin=nEnd为光标所在位置

SetSel( nIndex, nIndex );

为设置选中字符串或者为选中光标