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package Tk::Animation;
use vars qw($VERSION);
$VERSION = '4.008'; # $Id: //depot/Tkutf8/Tk/Animation.pm#8 $
use Tk::Photo;
use base qw(Tk::Photo);
Construct Tk::Widget 'Animation';
sub MainWindow
{
return shift->{'_MainWIndow_'};
}
sub add_frame
{
my $obj = shift;
$obj->{'_frames_'} = [] unless exists $obj->{'_frames_'};
push(@{$obj->{'_frames_'}},@_);
}
sub new
{
my ($class,$widget,%args) = @_;
my $obj = $class->SUPER::new($widget,%args);
$obj->{'_MainWIndow_'} = $widget->MainWindow;
if ($args{'-format'} eq 'gif')
{
my @images;
local $@;
while (1)
{
my $index = @images;
$args{'-format'} = "gif -index $index";
my $img;
eval {local $SIG{'__DIE__'}; $img = $class->SUPER::new($widget,%args) };
last if $@;
push(@images,$img);
}
if (@images > 1)
{
$obj->add_frame(@images);
$obj->{'_frame_index_'} = 0;
}
}
$obj->set_image( 0 );
$obj->_get_gif_info;
return $obj;
}
sub fast_forward {
my( $self, $delta) = @_;
$self->{_delta_} = $delta;
if( not exists $self->{_playing_} ) {
my $playing = exists $self->{'_NextId_'};
$self->{_playing_} = $playing;
$self->resume_animation if not $playing;
} else {
my $playing = delete $self->{_playing_};
$self->pause_animation if not $playing;
}
} # end fast_forward
*fast_reverse = \&fast_forward;
sub frame_count {
my $frames = shift->{'_frames_'};
return -1 unless $frames;
return @$frames;
}
sub set_disposal_method {
my( $self, $blank ) = @_;
$blank = 1 if not defined $blank;
$self->{_blank_} = $blank;
$blank;
}
sub set_image
{
my ($obj,$index) = @_;
my $frames = $obj->{'_frames_'};
return unless $frames && @$frames;
$index = 0 unless $index < @$frames;
$obj->blank if $obj->{_blank_}; # helps some make others worse
$obj->copy($frames->[$index]);
$obj->{'_frame_index_'} = $index;
}
sub next_image
{
my ($obj, $delta) = @_;
$obj->_next_image($delta);
}
sub _next_image
{
my ($obj, $delta, $in_animation) = @_;
$delta = $obj->{_delta_} unless $delta;
my $frames = $obj->{'_frames_'};
return unless $frames && @$frames;
my $next_index = (($obj->{'_frame_index_'} || 0) + $delta);
if ($next_index > @$frames && $in_animation && $obj->{'_loop_'} ne 'forever')
{
return 0; # signal to stop animation
}
$next_index %= @$frames;
$obj->set_image($next_index);
1;
}
sub prev_image { shift->next_image( -1 ) }
sub next_image_in_animation
{
my ($obj, $delta) = @_;
my $continue = $obj->_next_image($delta, 1);
if (!$continue && $self->{'_NextId_'})
{
$obj->pause_animation;
}
}
sub pause_animation {
my $self = shift;
my $id = delete $self->{'_NextId_'};
Tk::catch { $id->cancel } if $id;
}
sub resume_animation {
my( $self, $period ) = @_;
if( not defined $self->{'_period_'} ) {
$self->{'_period_'} = defined( $period ) ? $period : 100;
}
$period = $self->{'_period_'};
my $w = $self->MainWindow;
$self->{'_NextId_'} = $w->repeat( $period => [ $self => 'next_image_in_animation' ] );
}
sub start_animation
{
my ($obj,$period) = @_;
my $frames = $obj->{'_frames_'};
return unless $frames && @$frames;
my $w = $obj->MainWindow;
$obj->stop_animation;
$obj->{'_period_'} = $period if $period;
$obj->{'_NextId_'} = $w->repeat($obj->{'_period_'},[$obj,'next_image_in_animation']);
}
sub stop_animation
{
my ($obj) = @_;
my $id = delete $obj->{'_NextId_'};
Tk::catch { $id->cancel } if $id;
$obj->set_image(0);
}
sub _get_gif_info
{
my ($obj) = @_;
my $info;
if (defined(my $file = $obj->cget(-file)) && eval { require Image::Info; 1; })
{
$info = Image::Info::image_info($file);
}
elsif (defined(my $data = $obj->cget(-data)))
{
if ($data =~ m{^GIF8} && eval { require Image::Info; 1; })
{
$info = Image::Info::image_info(\$data);
}
elsif (eval { require Image::Info; require MIME::Base64; 1; })
{
$data = MIME::Base64::decode_base64($data);
$info = Image::Info::image_info(\$data);
}
}
if ($info)
{
$obj->{'_blank_'} = $info->{DisposalMethod} == 2 || $info->{DisposalMethod} == 3;
$obj->{'_period_'} = $info->{Delay}*1000 if defined $info->{Delay};
$obj->{'_loop_'} = $info->{GIF_Loop};
}
$obj->{'_blank_'} = 0 if !defined $obj->{'_blank_'};
$obj->{'_period_'} = 100 if !defined $obj->{'_period_'};
$obj->{'_loop_'} = 'forever' if !defined $obj->{'_loop_'};
$obj->{'_delta_'} = 1;
}
1;
__END__
#
# This almost works for changing the animation on the fly
# but does not resize things correctly
#
sub gif_sequence
{
my ($obj,%args) = @_;
my $widget = $obj->MainWindow;
my @images;
local $@;
while (1)
{
my $index = @images;
$args{'-format'} = "gif -index $index";
my $img;
eval
{local $SIG{'__DIE__'};
my $img = $widget->Photo(%args);
push(@images,$img);
};
last if $@;
}
if (@images)
{
delete $obj->{'_frames_'};
$obj->add_frame(@images);
$obj->configure(-width => 0, -height => 0);
$obj->set_frame(0);
}
}
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