Reading mouse-event on konsole

Question

#!/usr/bin/env perl
use warnings;
use 5.012;
binmode STDOUT, ':encoding(UTF-8)';
use Term::ReadKey;

sub getch {
    my $tty_in = shift;
    my $c = ReadKey 0, $tty_in;
    if ( $c eq "\e" ) {
        my $c = ReadKey 0.10, $tty_in;
        if ( $c eq '[' ) {
            my $c = ReadKey 0, $tty_in;
            if ( $c eq 'M' ) {   
                my $event_type = ord( ReadKey 0, $tty_in ) - 32;
                my $x = ord( ReadKey 0, $tty_in ) - 32;
                my $y = ord( ReadKey 0, $tty_in ) - 32;
                return $x, $y;
            }
        }
    }
}

#--------------------------------------------------------------
open my $tty_in, '<:encoding(utf-8)', '/dev/tty' or die $!;
Term::ReadKey::ReadMode 'ultra-raw', $tty_in;

# enter_mouse_mode
close $tty_in;
open $tty_in, '<:bytes', '/dev/tty' or die $!;
print "\e[?1003h";   # sets   SET_ANY_EVENT_MOUSE  mode

my( $x, $y ) = getch( $tty_in );

# leave_mouse_mode
close $tty_in;
open $tty_in, '<:encoding(utf-8)', '/dev/tty' or die $!;
print "\e[?1003l";   # cancels SET_ANY_EVENT_MOUSE mode

Term::ReadKey::ReadMode 'restore', $tty_in;
close $tty_in;
#----------------------------------------------------------------
say "x = $x";
say "y = $y";

I tried to move the marked part from "open $tty_in" to "STDIN", but it doesn't work yet. When "x" gets bigger then "95"(127-32) I get an error-message (utf8 "\x80" does not map to Unicode at (eval 1) line ...). How do I have to modify the replacement-part to get it work?

binmode STDIN, ':encoding(utf-8)' or die $!;
Term::ReadKey::ReadMode 'ultra-raw';

# enter_mouse_mode
binmode STDIN, ':bytes' or die $!;
print "\e[?1003h";

my( $x, $y ) = getch( *STDIN );

# leave_mouse_mode
binmode STDIN, ':encoding(utf-8)' or die $!;
print "\e[?1003l";
Term::ReadKey::ReadMode 'restore';

Answer 1

I have to change

binmode STDIN, ':bytes' or die $!;

with

binmode STDIN, ':pop:bytes' or die $!;

or with

binmode STDIN, ':raw' or die $!;

then it works.