🚀 go-pugleaf

Hi,

in my WinAPI application I create an ownerdrawn combo box with the
following style attributes:

  CBS_DISABLENOSCROLL, CBS_DROPDOWNLIST, CBS_HASSTRINGS,
  CBS_OWNERDRAWFIXED, CBS_NOINTEGRALHEIGHT, WS_BORDER,
  WS_CHILD, ~WS_TABSTOP

In its parent's WndProc I catch the appropriate messages like this:

  switch (iMessage)
  {
    case WM_MEASUREITEM:
    {
      LPMEASUREITEMSTRUCT mis = (LPMEASUREITEMSTRUCT)lParam;
      if (mis->CtlType == ODT_COMBOBOX)
      {
        mis->itemHeight = 17;
        return TRUE;
      }
      break;
    }
    case WM_DRAWITEM:
    {
      LPDRAWITEMSTRUCT dis = (LPDRAWITEMSTRUCT)lParam;
      if (dis->CtlType == ODT_COMBOBOX)
      {
        if (dis->itemState & ODS_COMBOBOXEDIT)
        {
          //...
        }
        else
        {
          //... (*)
        }
        return TRUE;
      }
      break;
    }
    case WM_COMMAND:
      if (HIWORD(wParam) == CBN_DROPDOWN)
      {
        SendMessage(mComboBox, WM_SETREDRAW, FALSE, 0);
        SendMessage(mComboBox, CB_RESETCONTENT, 0, 0);
        SendMessage(mComboBox, CB_ADDSTRING, 0,
(LPARAM)aString_1.c_str());
        //...
        SendMessage(mComboBox, CB_ADDSTRING, 0,
(LPARAM)aString_n.c_str());
        SendMessage(mComboBox, WM_SETREDRAW, TRUE, 0);
      }
      break;
  }
  return DefWindowProc(mHandle, iMessage, wParam, lParam);

Now, if I set a break point in the else part of the WM_DRAWITEM message
handling (marked with (*)), the dis->itemID is always -1 (which should
be the list index, I think, and thus >= 0), and dis->rcItem is always
{0, -15, 199, 0} (which should also change, IMO). Thus, I don't see the
dropdown listbox, but the control behaves like it is displaying the
listbox.
What did I wrong here? Did I miss something?

Thanks,
Martin