luke67m has asked for the wisdom of the Perl Monks concerning the following question:

Hi monks. I'm trying to use Tk::Hlist in a panel for file selection. I'm trying to make the panel usable both under linux and windows. I'm a newby. The hlist has 3 Columns. Here the problem : Under linux, if I define the first column with itemCreate, the cursor keys up and down works in unpredictable ways : Up sometimes goes down and down sometimes goes up. Under windows everything seems to work. Here a sample of my code 
###########################################################
#this not work
    my $e = $tree->add( $dir
    );
    
     $tree->itemCreate ($e, 0, 
            -itemtype => 'imagetext',
           -text => $text, -image => $tree->Getimage("folder"),
           -style=> $Col0StyleA
            );
#this not work
###########################################################
#this work
#    my $e = $tree->add( $dir  , -text => $text, -image => $tree->Geti
+mage("folder"),
#    );
#this work
###########################################################

[download]
I'm using winxp strawberry 5.18 and lubuntu 14.4 . Feel free to ask for full source, I can publish it on sourceforge

Replies are listed 'Best First'.
Re: Cursor keys with Tk::Hlist goes wrong
by zentara (Cardinal) on Aug 28, 2014 at 18:55 UTC
    I don't know why your bindings have messed up, but maybe you can manually fix them. Add corrections yourself. I'm hazarding a guess that you have your indices all messed up, and don't realize it. Here is a clue as to how to do it. 
    #!/usr/bin/perl
use warnings;
use strict;
use Tk;

my $mw = tkinit;
my $hl = $mw->HList(-itemtype=>'text')->pack;
for my $n (0..5){
     $hl->add($n ,
         -text=>"Item $n",
         );
}

$mw->bind('<Key-F1>',sub{$hl->selectionClear;
             $hl->anchorClear;
             $hl->selectionSet(0);
             $hl->anchorSet(0);
             }
      );

MainLoop;

# by Christoph

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    I'm not really a human, but I play one on earth.
    Old Perl Programmer Haiku ................... flash japh
[reply]
[d/l]
      I have tried your suggestion but it does not solve the problem. I've binded the function to F3. After the problem appears , I press F3, the selection is repositioned at root(my 0 Is \) but, after this , the problem persist : pressing 5 up_key the cursor goes up 3 Times and down 2 Times(really strange...).
[reply]
        You can find all the code (with your suggestion) at https://sourceforge.net/projects/copyandverify/files/ver0.010_ReplByDate/ . At the moment, the linux version has the itemcreate for col 0 commented and the add (with all attributes) active, so it works. If you search a line with all # you find the problematic code and your suggestion (on F3).
[reply]

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