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110 lines
4.2 KiB
HTML
110 lines
4.2 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- vi:set sw=2: -->
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<!--
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Copyright (C) 1996-2002 Brian Paul and Ben Bederson
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Copyright (C) 2005-2009 Greg Couch
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See the LICENSE file for copyright details.
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-->
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<head>
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
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<title>Upgrading to Version 2</title>
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</head>
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<body>
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<script type="text/javascript" src="header.js"></script>
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<script type="text/javascript">
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NavigationBar();
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</script>
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<h1 align="center">Upgrading to Version 2</h1>
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<h2>Contents</h2>
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<ul>
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<li><a href="#callbacks">Widget callback changes</a>
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<li><a href="#subcommands">Widget subcommand changes</a>
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<li><a href="#stereo">Stereo changes</a>
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<li><a href="#fonts">Font API changes</a>
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</ul>
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<hr>
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<p>
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Internally, Togl version 2 isn't very different from version 1,
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and much of the C interface is the same.
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The main difference is that the focus of the Togl API has changed
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from being a C API to being a Tcl API.
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Which means that the full power of Togl is accessible from Tcl
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(the few exceptions are considered bugs).
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<h2><a name="callbacks">Widget callback changes</a></h2>
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The biggest change is how the various callback are initialized.
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In version 1,
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the C API Togl_Set*Func functions had to be used
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to setup the callback functions before creating the Togl widget.
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And once the callbacks were set for a particular Togl widget,
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they could not be changed.
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If more than once Togl widget was needed,
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the callback functions would need to be reset before each widget creation.
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In version 2,
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the callbacks are configuration arguments to the widget
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and can be updated like any other standard widget configuration option.
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See the <a href="tclapi.html">Tcl API</a> for details.
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<h2><a name="subcommands">Widget subcommand changes</a></h2>
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Version 1 also allowed new subcommands to be added
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to the togl widget command via the C API.
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This was dropped for a variety of reasons:
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there is no exact Tcl equivalent,
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there is no standard object-oriented technique
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currently in the Tcl core (8.4.13),
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it is unclear how to make the API thread safe,
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and the internal Tcl C API doesn't support
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dynamically changing sets of subcommands.
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That said, this functionality might come back, especially when
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<a href="http://www.tcl.tk/cgi-bin/tct/tip/">TIP #257</a> is implemented.
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Instead, in version 2,
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create a Tcl function that takes the Togl widget as an argument.
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Functions written in C can get the underlying Togl structure handle
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with either the <code>Togl_GetToglFromObj</code>
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or the <code>Togl_GetToglFromName</code> function,
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as appropriate.
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This means that there are no special Togl commands, only Tcl commands.
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See the <a href="tclapi.html">C API</a> for details.
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<h2><a name="stereo">Stereo changes</a></h2>
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The stereo support has been totally revamped.
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Some <a href="stereo.html">form of stereo</a> is available all of the time.
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<h2><a name="fonts">Font changes</a></h2>
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Tcl support for writing strings has been added.
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<p>
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The <a href="capi.html#font">font C API</a> has been revised
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so that Togl_LoadBitmapFont returns a font object instead an integer
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(likewise for Togl_UnloadBitmapFont).
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So instead of calling glListBase and glCallLists directly,
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use Togl_WriteObj or Togl_WriteChars.
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<p>
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The TOGL_BITMAP_* constants remain for limited backwards
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source compatibility and are deprecated.
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The acceptable font names are now the same as Tk_GetFont
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and the Tk font command on all platforms.
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<hr>
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<a href="http://sourceforge.net/projects/togl">
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<img src="http://sflogo.sourceforge.net/sflogo.php?group_id=519&type=13" width="120" height="30" border="0" alt="Get Togl at SourceForge.net. Fast, secure and Free Open Source software downloads">
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</a>
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<a href="http://validator.w3.org/check?uri=referer">
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<img src="http://www.w3.org/Icons/valid-html401-blue"
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alt="Valid HTML 4.01 Transitional" height="31" width="88" border="0">
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</a>
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</body>
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</html>
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