text: ///////////////////////////////////////////////////////////////////////////////
  // Name:        wx/combobox.h
  // Purpose:     wxComboBox declaration
  // Author:      Vadim Zeitlin
  // Modified by:
  // Created:     24.12.00
  // Copyright:   (c) 1996-2000 wxWidgets team
  // Licence:     wxWindows licence
  ///////////////////////////////////////////////////////////////////////////////
  
  #ifndef _WX_COMBOBOX_H_BASE_
  #define _WX_COMBOBOX_H_BASE_
  
  #include "wx/defs.h"
  
  #if wxUSE_COMBOBOX
  
  // For compatibility with 2.8 include this header to allow using wxTE_XXX
  // styles with wxComboBox without explicitly including it in the user code.
  #include "wx/textctrl.h"
  
  extern WXDLLIMPEXP_DATA_CORE(const char) wxComboBoxNameStr[];
  
  // ----------------------------------------------------------------------------
  // wxComboBoxBase: this interface defines the methods wxComboBox must implement
  // ----------------------------------------------------------------------------
  
  #include "wx/ctrlsub.h"
  #include "wx/textentry.h"
  
  class WXDLLIMPEXP_CORE wxComboBoxBase : public wxItemContainer,
                                          public wxTextEntry
  {
  public:
      // override these methods to disambiguate between two base classes versions
      virtual void Clear() wxOVERRIDE
      {
          wxItemContainer::Clear();
          wxTextEntry::Clear();
      }
  
      // IsEmpty() is ambiguous because we inherit it from both wxItemContainer
      // and wxTextEntry, and even if defined it here to help the compiler with
      // choosing one of them, it would still be confusing for the human users of
      // this class. So instead define the clearly named methods below and leave
      // IsEmpty() ambiguous to trigger a compilation error if it's used.
      bool IsListEmpty() const { return wxItemContainer::IsEmpty(); }
      bool IsTextEmpty() const { return wxTextEntry::IsEmpty(); }
  
      // also bring in GetSelection() versions of both base classes in scope
      //
      // NB: GetSelection(from, to) could be already implemented in wxTextEntry
      //     but still make it pure virtual because for some platforms it's not
      //     implemented there and also because the derived class has to override
      //     it anyhow to avoid ambiguity with the other GetSelection()
      virtual int GetSelection() const wxOVERRIDE = 0;
      virtual void GetSelection(long *from, long *to) const wxOVERRIDE = 0;
  
      virtual void Popup() { wxFAIL_MSG( wxT("Not implemented") ); }
      virtual void Dismiss() { wxFAIL_MSG( wxT("Not implemented") ); }
  
      // may return value different from GetSelection() when the combobox
      // dropdown is shown and the user selected, but not yet accepted, a value
      // different from the old one in it
      virtual int GetCurrentSelection() const { return GetSelection(); }
  };
  
  // ----------------------------------------------------------------------------
  // include the platform-dependent header defining the real class
  // ----------------------------------------------------------------------------
  
  #if defined(__WXUNIVERSAL__)
      #include "wx/univ/combobox.h"
  #elif defined(__WXMSW__)
      #include "wx/msw/combobox.h"
  #elif defined(__WXMOTIF__)
      #include "wx/motif/combobox.h"
  #elif defined(__WXGTK20__)
      #include "wx/gtk/combobox.h"
  #elif defined(__WXGTK__)
      #include "wx/gtk1/combobox.h"
  #elif defined(__WXMAC__)
      #include "wx/osx/combobox.h"
  #elif defined(__WXQT__)
      #include "wx/qt/combobox.h"
  #endif
  
  #endif // wxUSE_COMBOBOX
  
  #endif // _WX_COMBOBOX_H_BASE_
  