include/wx/private/window.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/private/window.h
   3 // Purpose:     misc wxWindow helpers
   4 // Author:      Vaclav Slavik
   5 // Created:     2010-01-21
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2010 Vaclav Slavik
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 #ifndef _WX_PRIVATE_WINDOW_H_
  12 #define _WX_PRIVATE_WINDOW_H_
  13
  14 #include "wx/gdicmn.h"
  15
  16 namespace wxPrivate
  17 {
  18
  19 // Windows' computes dialog units using average character width over upper-
  20 // and lower-case ASCII alphabet and not using the average character width
  21 // metadata stored in the font; see
  22 // http://support.microsoft.com/default.aspx/kb/145994 for detailed discussion.
  23 //
  24 // This helper function computes font dimensions in the same way. It works with
  25 // either wxDC or wxWindow argument.
  26 template<typename T>
  27 inline wxSize GetAverageASCIILetterSize(const T& of_what)
  28 {
  29     const wxStringCharType *TEXT_TO_MEASURE =
  30         wxS("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz");
  31
  32     wxSize s = of_what.GetTextExtent(TEXT_TO_MEASURE);
  33     s.x = (s.x / 26 + 1) / 2;
  34     return s;
  35 }
  36
  37 } // namespace wxPrivate
  38
  39 #endif // _WX_PRIVATE_WINDOW_H_