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Catching the "Enter" key in a CListCtrl (and other controls)

Posted by Randy More on January 24th, 1999
In order to catch the "Enter" key, and other special keys in a CListCtrl (or any control for that matter) it is necessary to derive your own class and add a handler for the WM_GETDLGCODE message. To allow all special keys to be processed by the control add the following: 
UINT SMUPPGrid::OnGetDlgCode()
{ 
	UINT result = CListCtrl::OnGetDlgCode();
	result = result | DLGC_WANTALLKEYS;
	return result;
}

Other options include (from MSDEV documentation):

  • DLGC_WANTALLKEYS All keyboard input.
  • DLGC_WANTARROWS Arrow keys.
  • DLGC_WANTCHARS WM_CHAR messages.
  • DLGC_WANTMESSAGE All keyboard input. The application passes this message on to the control.
  • DLGC_WANTTAB TAB key.
  • DLGC_BUTTON Button (generic).
  • DLGC_DEFPUSHBUTTON Default pushbutton.
  • DLGC_HASSETSEL EM_SETSEL messages.
  • DLGC_UNDEFPUSHBUTTON No default pushbutton processing. (An application can use this flag with DLGC_BUTTON to indicate that it processes button input but relies on the system for default pushbutton processing.)
  • DLGC_RADIOBUTTON Radio button.
  • DLGC_STATIC Static control.

This is a relatively simple process but it is not really all that intuitive or well documented.

Last updated: 9 May 1998

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Comments

  • DLGC_UNDEFPUSHBUTTON: is this an undocumented feature?

    Posted by Legacy on 03/29/1999 12:00am

    Originally posted by: newsoft 

    When handling WM_GETDLGCODE, this is the behavior

    that I observed (i'm using NT 4.0 workstation SP4

    and Visual C++ 5.0 SP3):


    return DLGC_UNDEFPUSHBUTTON;

    // when this button gets the focus, the border

    // drawn with DrawFrameControl() is drawn with the

    // default black rectangle around it (as a default

    // button) and the regular default control (the OK

    // button usually) is drawn like a non-normal control.

    // Note that this affects only the DRAWING of buttons,

    // the enter key still goes to the default control

    // (the OK button - dismissing the dialog) even

    // though it's not drawn with the black rectangle

    // around it.


    return DLGC_DEFPUSHBUTTON;

    // when this button gets the focus, the enter

    // key will generate a WM_BUTTONDOWN event.

    // The key will not go the the usually default

    // button (the OK button usually).


    return DLGC_UNDEFPUSHBUTTON | DLGC_DEFPUSHBUTTON;

    // this seems to make an owner-drawn button behave

    // (look & feel) like a non owner-drawn button

    // (If using DrawFrameControl() to draw the frame).


    DLGC_BUTTON doesn't seem to have any effect if OR'ed

    with the above.

    Reply

  • Catching Enter in combobox

    Posted by Legacy on 10/26/1998 12:00am

    Originally posted by: Vadim 

    This doesn't work with combobox. To catch Enter in combobox 

    override PreTranslateMassage():


    if (pMsg->message == WM_KEYDOWN) {

      if ((int)pMsg->wParam == VK_RETURN) {

    	do your processing

      }

    }

    Reply
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