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=head1 NAME
Tk::TextUndo - perl/tk text widget with bindings to undo changes.
=for pm Tk/TextUndo.pm
=for category Derived Widgets
=head1 SYNOPSIS
S< >B<use Tk::TextUndo;>
S< >I<$testundo> = I<$parent>-E<gt>B<TextUndo>(?I<-option>=E<gt>I<value>, ...?);
=head1 DESCRIPTION
This IS-A text widget with an unlimited 'undo' history but without
a re'undo' capability.
=head2 Bindings
The C<TextUndo> widget has the same bindings as the L<Text|Tk::Text> widget.
In addition there are the following bindings:
=over 4
=item Event <L4> <<Undo>>
undo the last change. Pressing <L4> several times undo
step by step the changes made to the text widget.
=back
=head2 Methods
The C<TextUndo> widget has the same methods as C<Text> widget.
Additional methods for the C<TextUndo> widget are:
=over 4
=item $text->Load($filename);
Loads the contents of the $filename into the text widget. Load()
delete the previous contents of the text widget as well as it's
undo history of the previous file.
=item $text->Save(?$otherfilename?)
Save contents of the text widget to a file. If the
$otherfilename is not specified, the text widget contents
writes the file of $filename used in the last Load()
call. If no file was previously Load()'ed an error message
pops up. The default filename of the last Load() call
is not overwriten by $otherfilename.
=item $text->FileName(?$otherfilename?)
If passed an argument sets the file name associated with the loaded
document. Returns the current file name associated with the document.
=back
=head1 KEYS
widget, text, undo
=head1 SEE ALSO
L<Tk::Text>, L<Tk::ROText>
=cut
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