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package Tk::Reindex;
use vars qw($VERSION);
$VERSION = '4.005'; # $Id: //depot/Tkutf8/TextList/Reindex.pm#4 $
use Tk;
use base qw(Tk::Derived);
sub Populate
{
my ($w, $args) = @_;
$w->_callbase('Populate',$args);
$w->ConfigSpecs(-linestart => ["PASSIVE", "lineStart", "LineStart", 0],
-toindexcmd => ["CALLBACK", "toIndexCmd", "ToIndexCmd" , [\&to_index,$w]],
-fromindexcmd => ["CALLBACK", "fromIndexCmd","FromIndexCmd", [\&from_index,$w]]);
}
sub import
{
my($module,$base)=@_;
my $pkg=(caller)[0];
no strict 'refs';
*{"${pkg}::_reindexbase"}=sub{$base};
}
sub _callbase
{
my($w,$sub)=(shift,shift);
my $supersub=$w->_reindexbase()."::$sub";
$w->$supersub(@_);
}
BEGIN
{
# list of subroutines and index argument number (-1 as first element means return value)
my %subs=('bbox' => [0],
'compare' => [0,2],
'delete' => [0,1],
'dlineinfo' => [0],
'dump' => \&_find_dump_index,
'get' => [0,1],
'index' => [-1,0],
'insert' => [0],
'mark' => \&_find_mark_index,
'search' => \&_find_search_index,
'see' => [0],
'tag' => \&_find_tag_index,
'window' => [1],
'image' => [1],
);
foreach my $sub (keys %subs)
{
my $args=$subs{$sub};
my $argsub=ref $args eq 'CODE'?$args:sub{$args};
my $newsub=sub
{
my($w)=shift;
my(@iargs)=grep($_<=$#_,@{$argsub->(@_)});
my $iret=shift @iargs if @iargs && $iargs[0]==-1;
my(@args)=@_;
@args[@iargs]=$w->Callback(-toindexcmd,@args[@iargs]);
my(@ret)=$w->_callbase($sub,@args);
@ret=$w->Callback(-fromindexcmd,@ret) if $iret;
wantarray?@ret:$ret[0];
};
no strict 'refs';
*{$sub}=$newsub;
}
}
sub to_index
{
my $w=shift;
my $offset=$w->cget(-linestart)+1;
my(@args)=@_;
foreach (@args)
{
s/^\d+(?=\.)/$&+$offset/e;
}
@args;
}
sub from_index
{
my $w=shift;
my $offset=$w->cget(-linestart)+1;
my(@args)=@_;
foreach (@args)
{
s/^\d+(?=\.)/$&-$offset/e
}
@args;
}
sub _find_dump_index
{
my $idx=_count_options(@_);
[$idx,$idx+1];
}
sub _find_search_index
{
my $idx=_count_options(@_);
[$idx+1,$idx+2];
}
sub _count_options
{
my $idx=0;
while($_[$idx]=~/^-/g)
{
$idx++;
$idx++ if $' eq 'count' or $' eq 'command';
last if $' eq '-';
}
$idx;
}
sub _find_tag_index
{
return [1] if $_[0] eq 'names';
return [2,3] if $_[0]=~/^(add|remove|nextrange|prevrange)$/;
return [-1] if $_[0] eq 'ranges';
return [];
}
sub _find_mark_index
{
return [2] if $_[0] eq 'set';
return [1] if $_[0] eq 'next' or $_[0] eq 'previous';
return [];
}
1;
=head1 NAME
Tk::Reindex - change the base index of Text-like widgets
=for category Derived Widgets
=head1 SYNOPSIS
use Tk::ReindexedText;
$t1=$w->ReindexedText(-linestart => 2);
use Tk::ReindexedROText;
$t2=$w->ReindexedROText(-linestart => 0);
=head1 DESCRIPTION
Creates a new widget class based on B<Text>-like widgets that can
redefine the line number base (normally B<Text> widgets start line
numbers at 1), or possibly other manipulations on indexes.
=head1 STANDARD OPTIONS
The newly-defined widget takes all the same options as the base
widget, which defaults to B<Text>.
=head1 WIDGET-SPECIFIC OPTIONS
=over
=item Name: B<lineStart>
=item Class: B<LineStart>
=item Switch: B<-linestart>
Sets the line number of the first line in the B<Text> widget. The
default B<-toindexcmd> and B<-fromindexcmd> use this configuration
option.
-item Name: B<toIndexCmd> B<fromIndexCmd>
-item Class: B<ToIndexCmd> B<FromIndexCmd>
-item Switch: B<-toindexcmd> B<-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 B<Text> widget can understand. The callback is passed the
widget followed by a list of indexes, and should return a list of
translated indexes. B<-toindexcmd> should translate from 'user'
indexes to 'native' B<Text>-compatible indexes, and B<-fromindexcmd>
should translate from 'native' indexes to 'user' indexes.
The default callbacks simply add/subtract the offset given by the
B<-linestart> option for all indexes in 'line.character' format.
It would probably be prudent to make these functions inverses of each
other.
=back
=head1 CLASS METHODS
=over
=item import
To make new Reindex widgets, this function should be called via B<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.
=back
=head1 BUGS
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. B<Tk::Text::Contents> comes
to mind.
=head1 AUTHOR
Andrew Allen <ada@fc.hp.com>
This code may be distributed under the same conditions as Perl.
=cut
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