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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
0
 

Author Comment

by:yoavo
ID: 7044266
I dont think I like this solussion...
0
 
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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Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

 
LVL 4

Expert Comment

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

0
 

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 ?
0
 
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...
0
 
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
0

Featured Post

Netscaler Common Configuration How To guides

If you use NetScaler you will want to see these guides. The NetScaler How To Guides show administrators how to get NetScaler up and configured by providing instructions for common scenarios and some not so common ones.

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