#include "StdAfx.h"
#include "RuleEdit.h"

#define MAX_INPUTCHAR 24

CRuleEdit::CRuleEdit(void)
{
}

CRuleEdit::~CRuleEdit(void)
{
}

BEGIN_MESSAGE_MAP(CRuleEdit, CEdit)
	ON_WM_CHAR()
END_MESSAGE_MAP()

//-------------------------------------------------------------
// 说明：
// 处理的字符：
// 数字、字母、下划线、横线。
// 长度限制：最大输入数MAX_INPUTCHAR;
//-------------------------------------------------------------
void CRuleEdit::OnChar(UINT nChar, UINT nRepCnt, UINT nFlags)
{
	// 退格符要优先执行;
	if (nChar == 8 )
		CEdit::OnChar(nChar, nRepCnt, nFlags);

	int nStart, nEnd;
	CString strContext;
	GetWindowText(strContext);
	GetSel(nStart, nEnd);

	//if ( (nEnd-nStart) < MAX_INPUTCHAR && (strContext.GetLength() >= MAX_INPUTCHAR || nStart > MAX_INPUTCHAR ))
	if ( (nEnd-nStart) < MAX_INPUTCHAR && strContext.GetLength() >= MAX_INPUTCHAR)
	{
		return;
	}
	
	if (nChar == '-' || nChar == '_' || (nChar >=48 && nChar <= 57) || (nChar >=65 && nChar <= 90) || (nChar >= 97 && nChar <= 122))
	{
		CEdit::OnChar(nChar, nRepCnt, nFlags);
	}
}