Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Re: clunky Tk GUI

by zentara (Archbishop)
on Jan 21, 2009 at 14:00 UTC ( #737825=note: print w/replies, xml ) Need Help??


in reply to clunky Tk GUI

See Re: Tk Notebook tab columns for an example of using hashes and notebooks to maintain order. Also remember the power of the -createcmd and -raisecmd options of the NoteBook widget. They allow you to adjust pages (fill them with data) as you create or raise the tabs.

I'm not really a human, but I play one on earth Remember How Lucky You Are

Replies are listed 'Best First'.
Re^2: clunky Tk GUI
by honyok (Sexton) on Jan 21, 2009 at 16:21 UTC
    Thank you. I adapted this from your previous reply but, as a PERL dabbler, I am a bit perplexed by your hash structures. Can you add more explanation to your earlier code?
      Well it's all about hashes, and it's a big topic. I will reccomend you to the tutorials at Data Type: Hash. Now, I will try to give a brief explanation of how it all works.

      Instead of storing individual widgets in separate scalars, you can store those scalars in a orderly hash structure, which will allow you to access them by a key. So for instance, say you had 2 pages, and 3 widgets on each page. You could be "clunky" and call them $page1_widget1, $page1_widget2, $page1_widget3, and $page2_widget1, $page2_widget2, $page2_widget3.

      You can see how clunky that is. An alternative, would be to store them all in a hash, like

      my %hash; # NOT my $hash, unless you want to set it up reference sty +le # then create in loops $hash{$page}{$widget} #like foreach my $page(1..2){ #add the page $hash{$page}{'page'} = $nb->add(......) #fill each page with widgets foreach my $widg( 1..3){ $hash{$page}{$widj} = $hash{$page}{'page'}->Button(.....opt +ions.) } }
      Now, all you need to do to access any widget, is the $page and $widget number. For instance, the 2ond widget on page2, would be $hash{2}{2}. ( or $hash{$page}{$widj} )

      This is a very simple example of course, and real world apps each need the best hash setup. It sort of is an art that is learned by spending a few afternoons setting up hashes and experimenting. There are 2 great benefits to storing widgets in a hash.

      1. It makes accessing and looping thru them easy. You can loop thru all the widgets on page2 for instance.

      2. And this comes later.... if you want to put your script into a package or module, the hash is already setup to be blessed. Instead of $hash{$page}{$widj} you would have $self->{$page}->{$widj}.

      A whole book could be written on this, so I'm stopping now. Just play around with simple apps, and store things in hashes...it won't take long for you to figure it out.


      I'm not really a human, but I play one on earth Remember How Lucky You Are

        Hi,

        I think you mean

        my %hash;

        not

        my $hash;
        Thank your for your patience and help. I have improved the code a bit, but have hit a snag. I am using a hash reference to call a Checkbutton variable. The reference on line 55 , $flags{$tab} is the variable $pgr1_flag. Evidently this is ill-advised. Advice?
        use warnings; use strict; use Tk; use Tk::NoteBook; require Tk::Pane; use Tk::LabEntry; my $mw = MainWindow->new; $mw->geometry( "600x500" ); $mw->title("Survival Kit"); ##mainwindow, scroll, frames## my $spane=$mw->Scrolled('Pane')->pack(-expand=>1,-fill=>'both'); my $frame1=$spane->Frame()->pack(-side=>'left',-expand=>1,-fill=>'both +',-padx=>15); my $frame2=$spane->Frame(-padx=>15)->pack(-side=>'right',-expand=>1,-f +ill=>'both'); ##Checkbuttons## my ($pgr1_flag,$pgr2_flag); my %flags = qw(program1 $pgr1_flag program2 $pgr2_flag); my $cb_cnt=1; for my $flag (keys %flags){ if ($cb_cnt < 6 ){ my $flag_but=$frame1->Checkbutton(-text => "$flag ", -variable + => \$flags{$flag} )->pack; } else { my $flag_but=$frame2->Checkbutton(-text => "$flag ", -va +riable => \$flags{$flag} )->pack; } $cb_cnt++; } ##OPEN button## my $open=$mw->Button(-text => "Open\n Tool (s)", -command => \&but)->p +ack( -side=>'bottom', -pady=>20); MainLoop; ####################### subs ################################# sub but { ## kill top window $spane->destroy($open); ###default hash my %tools = ( 'program1' => { 'PARM1' => 1, 'PARM2' => 'n', 'PARM3' => + 'y', 'PARM4' => 'n', 'PARM5' => 'y', 'PARM6' => 'n', 'PARM7' => 'y', + 'PARM8' => 'n', 'PARM9' => 'y', 'PARM10' => 'n' }, 'program2' => { ' +PARM1' => 1, 'PARM2' => 2, 'PARM3' => 3, 'PARM4' => 4, 'PARM5' => 5, +'PARM6' => 6, 'PARM7' => 7, 'PARM8' => 8, 'PARM9' => 9, 'PARM10' => 1 +0 }); ## create notebook my $book = $mw->NoteBook()->pack(-expand=>1,-fill=>'both'); #####program1####### my $tab_cnt=1; for my $tab (keys %flags){ if ($flags{$tab}){ ##create tab,scroll pane,frames my $tab_tab=$book->add("Sheet $tab_cnt", -label => "$tab")->pack +(-expand=>1,-fill=>'both'); my $tab_spane=$tab_tab->Scrolled('Pane')->pack(-expand=>1,-fill= +>'both'); my $tab_frame1=$tab_spane->Frame()->pack(-side=>'left',-expand=> +0,-fill=>'both',-padx=>15); my $tab_frame2=$tab_spane->Frame(-padx=>15)->pack(-side=>'right' +,-expand=>0,-fill=>'both'); $tab_cnt++; ##now fill frames my $parm_cnt=0; print "Processing tool: $tab\n"; foreach my $parm ( keys %{$tools{$tab}}) { print " $parm = $tools{$tab}{$parm}\n"; if ($parm_cnt < 5){ $tab_frame1->LabEntry(-label => "$parm=", -textvariab +le => "$tools{$tab}{$parm}" )->pack; } else { $tab_frame2->LabEntry(-label => "$parm=", -textvariab +le => "$tools{$tab}{$parm}" )->pack; } my $tab_parms .= "$parm=$tools{$tab}{$parm}\n"; $parm_cnt++; } } } ###################SAVE parameters? ## button - disappears on reset? #my $save1=$sub_spane->Button(-text => "Save Parameters ")->pack; ########Exit button########### ## Implement save? my $leave=$mw->Button(-text => "Save & Exit ",-command => \&save_parms +)->pack; ############################## #######Reset button############# ##needs better implementation? my $return=$mw->Button(-text => "Reset ", -command => \&rtn)->pack( -s +ide=>'bottom', -pady=>20); } ###################################################################### +###################################### sub rtn{ system 'perl doOver.1 &'; exit; } ############################# #our ($pgr1_parms,$pgr2_parms); sub save_parms { # open (SP1,">pgr1_parms.txt"); # print SP1 $pgr1_parms; # close SP1; # open (SP2,">pgr2_parms.txt"); # print SP2 $pgr2_parms; # close SP2; exit; }
        BJ

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://737825]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (7)
As of 2021-01-25 14:51 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Notices?