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