如何在编辑控件上获得左键单击通知？

Question

I want to track event of single left-click on edit control. I override PretranslateMessage function as below:

BOOL CMyClass::PreTranslateMessage(Msg* pMsg)
    {
       switch(pMsg->message)

       case WM_LBUTTONDOWN:
       {
          CWnd* pWnd = GetFocus();
          if (pWnd->GetDlgCtrlID == MY_EDIT_CTRL_ID)
             {
                //Do some thing
             }
          break;
       }
    }

The problem is that when I click on the edit control, all other control become disabled (for example buttons don't respond to clicks etc.)

How can I fix this problem? Or how can I track click notificationN on edit box?

Answer 1

You need this:

BOOL CMyClass::PreTranslateMessage(MSG* pMsg)
{
  switch(pMsg->message)
  {
    case WM_LBUTTONDOWN:
    {
      CWnd* pWnd = GetFocus();
      if (pWnd->GetDlgCtrlID() == MY_EDIT_CTRL_ID)  // << typo corrected here
      {
         //Do some thing
      }
      break;
    }
  } 

  return __super::PreTranslateMessage(pMsg);  //<< added
}

BTW its a bit awkword to use a switch statement here. Following code is cleaner IMO, unless you want to add morecases than only WM_LBUTTONDOWN:

BOOL CMyClass::PreTranslateMessage(MSG* pMsg)
{
  if (pMsg->message == WM_LBUTTONDOWN)
  {
    CWnd* pWnd = GetFocus();

    if (pWnd->GetDlgCtrlID() == MY_EDIT_CTRL_ID)
    {
       //Do some thing
    }
  } 

  return __super::PreTranslateMessage(pMsg);  //<< added
}