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Reindex(3)			      perl/Tk Documentation			       Reindex(3)

       Tk::Reindex - change the base index of Text-like widgets

	   use Tk::ReindexedText;
	   $t1=$w->ReindexedText(-linestart => 2);

	   use Tk::ReindexedROText;
	   $t2=$w->ReindexedROText(-linestart => 0);

       Creates a new widget class based on Text-like widgets that can redefine the line number
       base (normally Text widgets start line numbers at 1), or possibly other manipulations on

       The newly-defined widget takes all the same options as the base widget, which defaults to

       Name:   lineStart
       Class:  LineStart
       Switch: -linestart
	   Sets the line number of the first line in the Text widget. The default -toindexcmd and
	   -fromindexcmd use this configuration option.

	   -item Name:	 toIndexCmd  fromIndexCmd

	   -item Class:  ToIndexCmd  FromIndexCmd

	   -item Switch: -toindexcmd -fromindexcmd

	   These two options specify callbacks that are called with a list of indexes and are
	   responsible for translating them to/from indexes that the base Text widget can
	   understand. The callback is passed the widget followed by a list of indexes, and
	   should return a list of translated indexes. -toindexcmd should translate from 'user'
	   indexes to 'native' Text-compatible indexes, and -fromindexcmd should translate from
	   'native' indexes to 'user' indexes.

	   The default callbacks simply add/subtract the offset given by the -linestart option
	   for all indexes in 'line.character' format.

	   It would probably be prudent to make these functions inverses of each other.

	   To make new Reindex widgets, this function should be called via use with the name of
	   the Text-like base class that you are extending with "Reindex" capability.  'use
	   base(Tk::Reindex Tk::nameofbasewidget)' should also be specified for that widget.

       I've used the word "indexes" instead of "indices" throughout the documentation.

       All the built-in perl code for widget bindings & methods will use the new 'user' indexes.
       Which means all this index manipulation might might break code that is trying to
       parse/manipulate indexes. Or even assume that '1.0' is the beginning index.
       Tk::Text::Contents comes to mind.

       Andrew Allen <ada@fc.hp.com>

       This code may be distributed under the same conditions as Perl.

Tk1.1					    2014-06-10				       Reindex(3)
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