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Combobox events with "CBS_DROPDOWN" style.

Posted on 2002-05-30
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Last Modified: 2013-11-20
Hi,
I derive a a class from CComboBox (CMyComboBox), and in it I capture some events such as OnKillFocus, and PreTranslateMessage (in order to handle Enter-pressing, and Escape-pressing). The combo can be created with CBS_DROPDOWN style or with CBS_DROPDOWNLIST style.
If I create it with CBS_DROPDOWNLIST than everything is fine, but when using CBS_DROPDOWN style, a EditBox is created (as a child of the combobox) and The combobox itself does not get the events.
How can I handle the WM_KILLFOCUS events in CMyComboBox class when using CBS_DROPDOWN style ???

Thanks,
Yoav.
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Question by:yoavo
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8 Comments
 
LVL 23

Expert Comment

by:Roshan Davis
ID: 7044245
Try this

// The following code shows how to subclass the edit control and list box
// controls inside a combo box. It uses WM_CTLCOLOR for subclassing.
// CSuperComboBox represents the combo box.
HBRUSH CSuperComboBox::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
   if (nCtlColor == CTLCOLOR_EDIT)
   {
      //Edit control
      if (m_edit.GetSafeHwnd() == NULL)
         m_edit.SubclassWindow(pWnd->GetSafeHwnd());
   }
   else if (nCtlColor == CTLCOLOR_LISTBOX)
   {
      //ListBox control
      if (m_listbox.GetSafeHwnd() == NULL)
         m_listbox.SubclassWindow(pWnd->GetSafeHwnd());
   }
   HBRUSH hbr = CComboBox::OnCtlColor(pDC, pWnd, nCtlColor);
   return hbr;
}


GOOD LUCK
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Author Comment

by:yoavo
ID: 7044266
I dont think I like this solussion...
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LVL 23

Expert Comment

by:Roshan Davis
ID: 7044271
It will work
another thing is that, How can I solve a microsoft bug in a direct way....


Regards

Roshmon

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LVL 4

Expert Comment

by:mblat
ID: 7044837
Did you try to everwrire REFLECTED CBN_KILLFOCUS?
In class wizard it is =CBN_KILLFOCUS?

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Author Comment

by:yoavo
ID: 7044882
mblat,
You are wtite. this solves me the kill focus problem, but how can I catch enter/escape pressed ?
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LVL 4

Expert Comment

by:mblat
ID: 7045006
Did you try to everwrire REFLECTED CBN_KILLFOCUS?
In class wizard it is =CBN_KILLFOCUS?

0
 
LVL 4

Expert Comment

by:mblat
ID: 7045016
Ok, it's not that simle actually, at list the way I know how to do it isn't. :-(

1. You need to sublclass CEdit control to CMyEdit.
2. Overwrite CMyEdit::OnGetDlgCode() and return DLGC_WANTALLKEYS from it.
3. Declare
CMyEdit m_edit as member variable of your CMyComboBox;
4. In your CMyComboBox owerwrite CMyComboBox::PreSubclassWindow.
5. After
CComboBox::PreSubclassWindow();
line put the following code:


CWnd* ce = GetWindow(GW_CHILD | GW_HWNDFIRST);
m_edit.SubclassWindow(ce->m_hWnd);

Now you can handle WM_KEYDOWN messages inside CMyEdit class...

Hope it helps...
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LVL 49

Accepted Solution

by:
DanRollins earned 50 total points
ID: 7045585
It's even easier than that:

BOOL CMyCombo::PreTranslateMessage(MSG* pMsg)
{
     if ( pMsg->message == WM_KEYDOWN) {
          if (pMsg->wParam == 27 ) {
               return(1); // eat ESC
          }
          if (pMsg->wParam == 13 ) {
               return(1); // eat Enter
          }
     }
     
     return CComboBox::PreTranslateMessage(pMsg);
}

-- Dan
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