include/wx/msw/private/textmeasure.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/msw/private/textmeasure.h
   3 // Purpose:     wxMSW-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_MSW_PRIVATE_TEXTMEASURE_H_
  11 #define _WX_MSW_PRIVATE_TEXTMEASURE_H_
  12
  13 #include "wx/msw/wrapwin.h"
  14
  15 // ----------------------------------------------------------------------------
  16 // wxTextMeasure for MSW.
  17 // ----------------------------------------------------------------------------
  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     void Init();
  36
  37     virtual void BeginMeasuring();
  38     virtual void EndMeasuring();
  39
  40     virtual void DoGetTextExtent(const wxString& string,
  41                                wxCoord *width,
  42                                wxCoord *height,
  43                                wxCoord *descent = NULL,
  44                                wxCoord *externalLeading = NULL);
  45
  46     virtual bool DoGetPartialTextExtents(const wxString& text,
  47                                          wxArrayInt& widths,
  48                                          double scaleX);
  49
  50
  51
  52     // We use either the HDC of the provided wxDC or an HDC created for our
  53     // window.
  54     HDC m_hdc;
  55
  56     // If we change the font in BeginMeasuring(), we restore it to the old one
  57     // in EndMeasuring().
  58     HFONT m_hfontOld;
  59
  60     wxDECLARE_NO_COPY_CLASS(wxTextMeasure);
  61 };
  62
  63 #endif // _WX_MSW_PRIVATE_TEXTMEASURE_H_