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

Greetings,

I am learning Curses::UI and am trying to mix printing to stdout with the curses elements. Here is a code snippet: 

#!/usr/bin/perl

use strict;
use warnings;
use Curses::UI;

my $cui = new Curses::UI(
                         -color_support => 1,
                        );  

my $window = $cui->add(
                       "main_window",
                       "Window",
                       -width  => 50, 
                       -height => 4,
                      );  

my $text_editor = $window->add(
                               "description_text",
                               "TextEditor",
                               -text         => "", 
                               -title        => "Enter Description",
                               -border       => 1,
                               -singleline   => 1,
                               -width        => 40, 
                               -bfg          => "red",
                               -titlereverse => 0,
                               -showlines    => 1,
                               -x            => 0,
                               -y            => 0,
                              );  

my $okay_button = $window->add(
                               "buttons",
                               "Buttonbox",
                               -border  => 1,
                               -width   => 6,
                               -bfg     => "blue",
                               -x       => 40, 
                               -y       => 0,
                               -buttons => [
                                            {   
                                             -label => "Okay",
                                             -value => 1,
                                             -shortcut => "o",
                                             -onpress  => sub { $cui->
+mainloopExit; },
                                            },  
                                           ],  
                              );  
$text_editor->focus;
$cui->mainloop;

print "outside of mainloop!\n";

[download]
However, I never see the "outside of mainloop!" printed to stdout.

Any ideas?

Thanks for the help,

-mz

Replies are listed 'Best First'.
Re: mixing curses::ui with stdout program
by Khen1950fx (Canon) on Mar 28, 2012 at 19:25 UTC
    Try the leave_curses() method. 
    #!/usr/bin/perl

use strict;
use warnings;
use Curses::UI;

my $cui = new Curses::UI( -color_support => 1, );

my $window = $cui->add(
    "main_window",
    "Window",
    -width  => 50,
    -height => 4,
);

my $text_editor = $window->add(
    "description_text",
    "TextEditor",
    -text         => "",
    -title        => "Enter Description",
    -border       => 1,
    -singleline   => 1,
    -width        => 40,
    -bfg          => "red",
    -titlereverse => 0,
    -showlines    => 1,
    -x            => 0,
    -y            => 0,
);

my $okay_button = $window->add(
    "buttons",
    "Buttonbox",
    -border  => 1,
    -width   => 6,
    -bfg     => "blue",
    -x       => 40,
    -y       => 0,
    -buttons => [
        {
            -label    => "Okay",
            -value    => 1,
            -shortcut => "o",
            -onpress  => sub { $cui->mainloopExit; },
        },
    ],
);
$text_editor->focus;
$cui->leave_curses;
print "Outside of mainloop!\n";
$cui->mainloop;

    [download]
[reply]
[d/l]
Re: mixing curses::ui with stdout program
by bms (Monk) on Mar 28, 2012 at 16:55 UTC

    If your running on a Linux box and executing that script through a terminal, it should work. However:

    print STDOUT "Try this\n";

    [download]
[reply]
[d/l]
      Hi bms!

      Thanks for your reply. I am running this on a GNU/Linux box. Unfortunately, your suggestion does not improve the result: 

      ---{/tmp/curses_ui_test}---
...
$text_editor->focus;
$cui->mainloop;

print STDOUT "outside of mainloop!\n";
---{/tmp/curses_ui_test}---

      [download]
      mzagrabe@achilles:/tmp$ ./curses_ui_test 
mzagrabe@achilles:/tmp$

      [download]
      I would expect to see something between the two prompts above.

      Any other ideas? :)

      Thanks!

      -mz
[reply]
[d/l]
[select]
Re: mixing curses::ui with stdout program
by bms (Monk) on Mar 28, 2012 at 20:14 UTC

    Alrighty, try this:

    #!/usr/bin/env perl

use strict;
use warnings;
use Curses::UI;

my $cui = new Curses::UI(
                         -color_support => 1,
                        );  

my $window = $cui->add(
                       "main_window",
                       "Window",
                       -width  => 70, 
                       -height => 4,
                      );  

my $text_editor = $window->add(
                               "description_text",
                               "TextEditor",
                               -text         => "", 
                               -title        => "Enter Description",
                               -border       => 1,
                               -singleline   => 1,
                               -width        => 40, 
                               -bfg          => "red",
                               -titlereverse => 0,
                               -showlines    => 1,
                               -x            => 0,
                               -y            => 0,
                              );  

my $okay_button = $window->add(
                               "buttons",
                               "Buttonbox",
                               -border  => 1,
                               -width   => 6,
                               -bfg     => "blue",
                               -x       => 40, 
                               -y       => 0,
                               -buttons => [
                                            {   
                                             -label => "Okay",
                                             -value => 1,
                                             -shortcut => "o",
                                             -onpress  => sub {
                                                              $cui->le
+ave_curses();
                                                              print "O
+utside of mainloop!\n";
                                                              sleep(2)
+;
                                                              $cui->re
+set_curses();
                                                          },
                                            },  
                                           ],  
                              ); 

my $exit_button = $window->add(
                               "exit",
                               "Buttonbox",
                               -border  => 1,
                               -width   => 6,
                               -bfg     => "blue",
                               -x       => 46, 
                               -y       => 0,
                               -buttons => [
                                            {   
                                             -label => "Exit",
                                             -value => 1,
                                             -shortcut => "x",
                                             -onpress  => sub { $cui->
+mainloopExit; },
                                            },  
                                           ],  
                              ); 
                               
 
$text_editor->focus;
$cui->mainloop;

    [download]

    Now, using the Okay button flashes you to the terminal for a couple seconds to see the output of print and then goes back to Curses.

    Hope this helps

[reply]
[d/l]

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