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 \page unicode 11 - Unicode and utf-8 Support

This chapter explains how FLTK handles international 
text via Unicode and utf-8.

Unicode support was only recently added to FLTK and is
still incomplete. This chapter is Work in Progress, reflecting
the current state of Unicode support.

\section unicode_about About Unicode and utf-8

The Unicode Standard is a worldwide accepted charatcer encoding 
standard. Unicode provides access to over 100,000 characters 
used in all the major languages written today.

Utf-8 encodes all Unicode characters into variable length 
sequences of bytes. Unicode characters in the 7-bit ASCII 
range map to the same value in utf-8, making the transformation
to Unicode quick and easy.

Moving from ASCII encoding to Unicode will allow all new FLTK
applications to be easily internationalized and and used all
over the world. By choosing utf-8 encoding, FLTK remains 
largely source-code compatible to previous iteration of the 
library.

\section unicode_in_fltk Unicode in FLTK

FLTK will be entirely converted to Unicode in utf-8 encoding.
If a different encoding is required by the underlying operatings
system, FLTK will convert string as needed.

\par TODO:

\li more doc on unicode, add links
\li write something about filename encoding on OS X...
\li explain the fl_utf8_... commands
\li explain issues with Fl_Preferences
\li why FLTK has no Fl_String class

\par DONE:

\li initial transfer of the Ian/O'ksi'D patch
\li adapted Makefiles and IDEs for available platforms
\li hacked some Unicode keybard entry for OS X

\par ISSUES:

\li  IDEs:
    - Makefile support: tested on Fedora Core 5 and OS X, but heaven knows  
      on which platforms this may fail
    - Xcode: tested, seems to be working (but see comments below on OS X)
    - VisualC (VC6): tested, test/utf8 works, but may have had some issues  
      during merge. Some additional work needed (imm32.lib)
    - VisualStudio2005: tested, test/utf8 works, some addtl. work needed  
     (imm32.lib)
    - VisualCNet: sorry, I have no longer access to that IDE
    - Borland and other compiler: sorry, I can't update those

\li  Platforms:
    - you will encounter problems on all platforms!
    - X11: many characters are missing, but that may be related to bad  
      fonts on my machine. I also could not do any keyboard tests yet.  
      Rendering seems to generally work ok.
    - Win32: US and German keyboard worked ok, but no compositing was  
      tested. Rendering looks pretty good.
    - OS X: redering looks good. Keyboard is completely messed up, even in  
      US setting (with Alt key)
    - all: while merging I have seen plenty of places that are not  
      entirley utf8-safe, particularly Fl_Input, Fl_Text_Editor, and  
      Fl_Help_View. Keycodes from the keyboard conflict with Unicode  
      characters. Right-to-left rendered text can not be marked or edited,  
      and probably much more.
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