I am trying to write simple application, which allows autocompletion while typing text. There is very good widget Tk::MatchEntry, but allows only autocompletion of whole string. I am aiming at autocompletion on every word I type. Below is what I did to this moment: app, widgets, binding. The problem is with selection management in the OnKeyPress() function. If I could extract properly whole content from textbox and extract selection text I would handle the rest.

I've read Tk manual, am aware of 'sel.first', 'sel.last'. It seems to me I won't have to translate from 2D to 1D format if I use 'delete', 'insert' (and other Tk::Entry commands) in some clever way.

In the comment at the end of the code is the idea of what I want to achieve. Any help/comment is welcome.

#!/usr/local/bin/perl
use Tk;
use Tk ':variables';

use strict;
use warnings;

# Main Window
my $mw = new MainWindow;

#GUI Building Area
my $frm_name = $mw -> Frame();

#Text Area
my $textarea = $mw -> Frame();
my $txt = $textarea -> Text(-width=>40, -height=>10);
my $srl_y = $textarea -> Scrollbar(-orient=>'v',-command=>[yview => $t
+xt]);
my $srl_x = $textarea -> Scrollbar(-orient=>'h',-command=>[xview => $t
+xt]);
$txt -> configure(-yscrollcommand=>['set', $srl_y], -xscrollcommand=>[
+'set',$srl_x]);

my $log = $textarea -> Text(-width=>40, -height=>2);

#Geometry Management
$frm_name -> grid(-row=>1,-column=>1,-columnspan=>2);

$txt -> grid(-row=>1,-column=>1);
$log -> grid(-row=>6,-column=>1);
$srl_y -> grid(-row=>1,-column=>2,-sticky=>"ns");
$srl_x -> grid(-row=>2,-column=>1,-sticky=>"ew");
$textarea -> grid(-row=>5,-column=>1,-columnspan=>2);

$txt->bind('<KeyPress>', [\&OnKeyPress, $txt]);

my @dictionary = qw/rewelation reduction renowation reckonesance reval
+uation reply/;

$txt->focus;

MainLoop;

sub OnKeyPress
{
    my $txtBox = $_[0];
    
    # print 'Keysym=', $Tk::event->K, ', numeric=', $Tk::event->N, "\n
+";
    
    my @r = $txtBox->tagRanges('sel');
    if(@r)
    {
        my $str = $txtBox->get();
        my $sel = substr $str, $r[0], $r[1]-$r[0];
        print 'selected: ', $sel;
    }
}

=the rest

sub OnKeyPressed
{
    if(key is <ENTER>)
        { accept_auto_complete_version() }
    elsif(matches_first_char_in_autocompletion_version())
    {
        unselect this char;
    }
    else
    {
        unselect this char;
        find_other_autocompletion;
    }
}
=cut

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In reply to Tk::Entry selection problem by grizzley

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