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# Timer.pm
#
# A package for manipulating SDL_Timer *
#
# Copyright (C) 2002 David J. Goehrig
package SDL::Timer;
use strict;
use SDL;
sub new {
my $proto = shift;
my $class = ref($proto) || $proto;
my $self = {};
my $func = shift;
my (%options) = @_;
verify(%options,qw/ -delay -times -d -t /);
die "SDL::Timer::new no delay specified\n"
unless ($options{-delay});
$$self{-delay} = $options{-delay} || $options{-d} || 0;
$$self{-times} = $options{-times} || $options{-t} || 0;
if ($$self{-times}) {
$$self{-routine} = sub { &$func($self); $$self{-delay} if(--$$self{-times}) };
} else {
$$self{-routine} = sub { &$func; $$self{-delay}};
}
$$self{-timer} = SDL::NewTimer($$self{-delay},$$self{-routine});
die "Could not create timer, ", SDL::GetError(), "\n"
unless ($self->{-timer});
bless $self,$class;
return $self;
}
sub DESTROY {
my $self = shift;
SDL::RemoveTimer($$self{-timer}) if ($$self{-timer});
$$self{-timer} = 0;
}
sub run {
my ($self,$delay,$times) = @_;
$$self{-delay} = $delay;
$$self{-times} = $times;
SDL::RemoveTimer($$self{-timer}) if ($$self{-timer});
$$self{-timer} = SDL::AddTimer($$self{-delay},SDL::PerlTimerCallback,$$self{-routine});
}
sub stop {
my ($self) = @_;
SDL::RemoveTimer($$self{-timer}) if ($$self{-timer});
$$self{-timer} = 0;
}
1;
__END__;
=pod
=head1 NAME
SDL::Timer - a SDL perl extension to handle timers
=head1 SYNOPSIS
$timer = new SDL::Timer { print "tick"; 4000; } -delay => 4000;
=head1 DESCRIPTION
C<SDL::Timer> provides an abstract interface to the SDL::Timer
callback code. SDL::Timer::new requires a subroutine and a delay
at which is the initial interval between the creation of the
timer until the first call to the subroutine. The subroutine
must return a value which is the delay until the it is called again.
=head1 AUTHOR
David J. Goehrig
=head1 SEE ALSO
perl(1) SDL(3)
=cut
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