Re^4: Editable tree in Tk

After some digging, I figured it out. I was deleting a button from the Text widget, as you'd delete text, but that destroys the button completely, so I got an error the next time I tried to re-insert it. It was still in my hash of buttons, though, which made me thing the button still exists. Took me a while to debug my sample code until I made it do what I want :)

If anyone's interested, I'm attaching my sample code. Now on to changing the original to behave the same way...

use strict; 
use Tk;

my $mw = MainWindow->new();
my $input_frame = $mw->Frame()
    ->pack(-expand => 1,
       -fill => 'both');
my $input = $input_frame->Scrolled('Text')
    ->pack(-expand => 1,
       -fill => 'both');
$input->tagConfigure("invisible", -elide => 'true');

my %buttons;
for (my $i = 1; $i < 20; $i++) {
    if ($i % 5 == 0) {
    # Create both buttons
    $buttons{"minus_$i"} = $input->Button(-image => $mw->Getimage('min
+us'),
                          -command => [\&hide,$i]);
    $buttons{"plus_$i"} = $input->Button(-image => $mw->Getimage('plus
+'),
                          -command => [\&reveal,$i]);
    # Insert only the minus button
    $input->windowCreate('end',-window => $buttons{"minus_$i"});
    }
    $input->insert('end',"abcdefghijkl$i\n");
}

MainLoop(); 


sub hide {
    my ($index) = @_;
    my $from = $index + 1;
    my $to = $index + 5;
    $input->tagAdd("invisible","$from.0","$to.0");
    switch_button($index,'plus','minus');
    return;
}

sub reveal {
    my ($index) = @_;
    my $from = $index + 1;
    my $to = $index + 5;
    $input->tagRemove("invisible","$from.0","$to.0");
    switch_button($index, 'minus', 'plus');
    return;
}

sub switch_button {
    my ($j, $new_sign, $old_sign) = @_;
    $input->delete("$j.0");
    if ($old_sign eq 'plus') {
    $buttons{"plus_$j"} = $input->Button(-image => $mw->Getimage('plus
+'),
                         -command => [\&reveal,$j]);
    } else {
    $buttons{"minus_$j"} = $input->Button(-image => $mw->Getimage('min
+us'),
                          -command => [\&hide,$j]);      
    }
    $input->windowCreate("$j.0",-window => $buttons{"${new_sign}_$j"})
+;
    return;
}
[download]

EDIT: I just checked out the code in your other reply, and though I think that for now I'll stay with my version, I definitely learned a couple of new things from it. Thanks!

Comment on Re^4: Editable tree in Tk Download Code

Replies are listed 'Best First'.
Re^5: Editable tree in Tk by zentara (Cardinal) on Dec 25, 2008 at 16:53 UTC
Very nice. All you need is some colors,some tags that do indentation, and a mouse cursor change. I'm not really a human, but I play one on earth Remember How Lucky You Are	[reply]