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