title: MFC的编辑框响应双击事件的三种方法
author: 零贰
date: 2020-08-09 13:04:17
category: [编程代码]
tags: [VC6,代码,学习]

MFC的编辑框响应双击事件的三种方法

@TOC

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正文

一. PreTranslateMessage结合位置信息法
在类中重写下面函数:

virtual BOOL PreTranslateMessage(MSG* pMsg) override

  {
    if (pMsg->message == WM_LBUTTONDBLCLK)
    {
      CEdit* ptr = (CEdit*)GetDlgItem(IDC_Edit);
      CRect rect; ptr->GetWindowRect(&rect);
      if (rect.PtInRect(pMsg->pt))
      {
        //具体事务
      }
    }
    return CDialog::PreTranslateMessage(pMsg);
  }

二. 子类继承法
创建CMyEdit类, 并创建一个其变量, 且与使用的编辑框进行DDX关联, 接着写双击事件的代码, 如下:

class CMyEdit : public CEdit
{
public:
DECLARE_MESSAGE_MAP()
afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point);
};
BEGIN_MESSAGE_MAP(CMyEdit, CEdit)
ON_WM_LBUTTONDBLCLK()
END_MESSAGE_MAP()
void CMyEdit::OnLButtonDblClk(UINT nFlags, CPoint point)
{
// TODO: 在此添加消息处理程序代码和/或调用默认值
CEdit::OnLButtonDblClk(nFlags, point);
}
三. 子类发消息法

class CMyEdit : public CEdit
{
protected:
virtual BOOL PreTranslateMessage(MSG * pMsg) override
{

if (pMsg->message == WM_LBUTTONDBLCLK)
{
//AfxWndProc接收BN_DOUBLECLICKED函数,并处理
  AfxWndProc(
    GetParent()->GetSafeHwnd(),
    WM_COMMAND,
    (WPARAM)((BN_DOUBLECLICKED << 16) | GetDlgCtrlID()),
    (LPARAM)GetSafeHwnd());
}
return __super::PreTranslateMessage(pMsg);

}
};
或者使用:

//PostMessage发送系统消息BN_DOUBLECLICKED并处理
::PostMessage(

  GetParent()->GetSafeHwnd(),
  WM_COMMAND,
  (BN_DOUBLECLICKED << 16) | GetDlgCtrlID(),
  (LPARAM)GetSafeHwnd());

或者使用:

protected:
virtual BOOL PreTranslateMessage(MSG * pMsg) override
{
//此PostMessage发送控件原生消息BN_DOUBLECLICKED并处理

if (pMsg->message == WM_LBUTTONDBLCLK)
{
  if (m_hWnd)
  {
    ::PostMessage(
      ::GetParent(m_hWnd),
      WM_COMMAND,
      (WPARAM)((EM_LBUTTONDBLCLK() << 16) | (WPARAM)::GetDlgCtrlID(m_hWnd)),
      (LPARAM)GetSafeHwnd());
  }
}
return __super::PreTranslateMessage(pMsg);

}
可以使用下面的反射进行验证: 反射消息将先被编辑框捕获, 然后再传到其父类中去;

protected:
BOOL On_EM_LBUTTONDBLCLK() { return 0; }

protected:
DEFINE_MESSAGE_MAP_BGN()
{

WM_COMMAND + WM_REFLECT_BASE, (WORD)CEdit_ResponseLButtonDblClick::EM_LBUTTONDBLCLK(), 0, 0, AfxSigCmd_b, 
  (AFX_PMSG)(static_cast<BOOL(AFX_MSG_CALL CCmdTarget::*)(void)> (&CEdit_ResponseLButtonDblClick::On_EM_LBUTTONDBLCLK))

}

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