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 // RCS-ID:      $Id:
   7 // Copyright:   (c) 1997-2012 wxWidgets team
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_MSW_PRIVATE_TEXTMEASURE_H_
  12 #define _WX_MSW_PRIVATE_TEXTMEASURE_H_
  13
  14 #include "wx/msw/wrapwin.h"
  15
  16 // ----------------------------------------------------------------------------
  17 // wxTextMeasure for MSW.
  18 // ----------------------------------------------------------------------------
  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     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
  52
  53     // We use either the HDC of the provided wxDC or an HDC created for our
  54     // window.
  55     HDC m_hdc;
  56
  57     // If we change the font in BeginMeasuring(), we restore it to the old one
  58     // in EndMeasuring().
  59     HFONT m_hfontOld;
  60
  61     wxDECLARE_NO_COPY_CLASS(wxTextMeasure);
  62 };
  63
  64 #endif // _WX_MSW_PRIVATE_TEXTMEASURE_H_