include/wx/gtk/private/textmeasure.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/gtk/private/textmeasure.h
   3 // Purpose:     wxGTK-specific declaration of wxTextMeasure class
   4 // Author:      Manuel Martin
   5 // Created:     2012-10-05
   6 // RCS-ID:      $Id:
   7 // Copyright:   (c) 1997-2012 wxWidgets team
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_GTK_PRIVATE_TEXTMEASURE_H_
  12 #define _WX_GTK_PRIVATE_TEXTMEASURE_H_
  13
  14 // ----------------------------------------------------------------------------
  15 // wxTextMeasure
  16 // ----------------------------------------------------------------------------
  17
  18 class WXDLLIMPEXP_FWD_CORE wxWindowDCImpl;
  19
  20 class wxTextMeasure : public wxTextMeasureBase
  21 {
  22 public:
  23     wxEXPLICIT wxTextMeasure(const wxDC *dc, const wxFont *font = NULL)
  24         : wxTextMeasureBase(dc, font)
  25     {
  26         Init();
  27     }
  28
  29     wxEXPLICIT wxTextMeasure(const wxWindow *win, const wxFont *font = NULL)
  30         : wxTextMeasureBase(win, font)
  31     {
  32         Init();
  33     }
  34
  35 protected:
  36     // Common part of both ctors.
  37     void Init();
  38
  39     virtual void BeginMeasuring();
  40     virtual void EndMeasuring();
  41
  42     virtual void DoGetTextExtent(const wxString& string,
  43                                  wxCoord *width,
  44                                  wxCoord *height,
  45                                  wxCoord *descent = NULL,
  46                                  wxCoord *externalLeading = NULL);
  47
  48     virtual bool DoGetPartialTextExtents(const wxString& text,
  49                                          wxArrayInt& widths,
  50                                          double scaleX);
  51
  52     // This class is only used for DC text measuring with GTK+ 2 as GTK+ 3 uses
  53     // Cairo and not Pango for this. However it's still used even with GTK+ 3
  54     // for window text measuring, so the context and the layout are still
  55     // needed.
  56 #ifndef __WXGTK3__
  57     wxWindowDCImpl *m_wdc;
  58 #endif // GTK+ < 3
  59     PangoContext *m_context;
  60     PangoLayout *m_layout;
  61
  62     wxDECLARE_NO_COPY_CLASS(wxTextMeasure);
  63 };
  64
  65 #endif // _WX_GTK_PRIVATE_TEXTMEASURE_H_