Re: Does the Glib mainloop have the ability to capture keypresses?

[zentara <zentara1 sbcglobal net>]

On Wed, 14 Feb 2007 18:18:29 -0500
muppet <scott asofyet org> wrote:

> > zentara wrote:
> > I can put
> > Glib::IO->add_watch (fileno 'STDIN', [qw/in/], \&watch_callback);
> > and watch what is input on STDIN, but is that the best way?
>
> I took that approach in gish, where i faked out the Tk portion of  
> Readline.
> http://asofyet.org/muppet/software/gtk2-perl/gish.html
>
>
> But it is important that you set up STDIN properly to give you all  
> the characters pressed, instead of using line-buffering.  Readline  
> does that for you...  in your own app, you'll have to use the termios  
> stuff from the POSIX module.

I came up with 2 different versions. The first will trigger the callback
on an enter press, to take whole line commands.

#!/usr/bin/perl
use warnings;
use strict;
use Glib;
use Glib qw/TRUE FALSE/;

use FileHandle;
#accepts enter to provide input
my $fh_in = FileHandle->new();
$fh_in = *STDIN{IO};                                                                   

my $main_loop = Glib::MainLoop->new;

Glib::IO->add_watch (fileno 'STDIN', [qw/in/], \&watch_callback);       

$main_loop->run;
######################################
sub watch_callback {
  while (<$fh_in>) {                                                                        
    my $line = $_;
    if (defined($line) and $line ne ''){
          print $line;
    }
  }
return 0;
}
__END__

The above waits for you to type, then press enter, to get a whole line.
Without the FileHandle module, you could still send commands to STDIN,
but you needed a Control-d to send it. It would however, allow multi-line
input.

###############################################################


This one will capture just a key-press, which you can process.

#!/usr/bin/perl
use warnings;
use strict;
use Glib;
use Glib qw/TRUE FALSE/;

use Term::ReadKey;
$|++;
ReadMode('cbreak');

my $main_loop = Glib::MainLoop->new;

Glib::Idle->add(
        sub{
            my $char;
            if (defined ($char = ReadKey(0)) ) {
            print "$char->", ord($char),"\n";    
            #process key presses here
            }
          return TRUE; #keep this going 
          });
        
$main_loop->run;
ReadMode('normal'); # restore normal tty settings
__END__



zentara

-- 
I'm not really a human, but I play one on earth.
http://zentara.net/japh.html