| 1 | package Tk::Animation; |
| 2 | |
| 3 | use vars qw($VERSION); |
| 4 | $VERSION = '3.018'; # $Id: //depot/Tk8/Tk/Animation.pm#18 $ |
| 5 | |
| 6 | use Tk::Photo; |
| 7 | use base qw(Tk::Photo); |
| 8 | |
| 9 | Construct Tk::Widget 'Animation'; |
| 10 | |
| 11 | sub MainWindow |
| 12 | { |
| 13 | return shift->{'_MainWIndow_'}; |
| 14 | } |
| 15 | |
| 16 | sub add_frame |
| 17 | { |
| 18 | my $obj = shift; |
| 19 | $obj->{'_frames_'} = [] unless exists $obj->{'_frames_'}; |
| 20 | push(@{$obj->{'_frames_'}},@_); |
| 21 | } |
| 22 | |
| 23 | sub new |
| 24 | { |
| 25 | my ($class,$widget,%args) = @_; |
| 26 | my $obj = $class->SUPER::new($widget,%args); |
| 27 | $obj->{'_MainWIndow_'} = $widget->MainWindow; |
| 28 | if ($args{'-format'} eq 'gif') |
| 29 | { |
| 30 | my @images; |
| 31 | local $@; |
| 32 | while (1) |
| 33 | { |
| 34 | my $index = @images; |
| 35 | $args{'-format'} = "gif -index $index"; |
| 36 | my $img; |
| 37 | eval {local $SIG{'__DIE__'}; $img = $class->SUPER::new($widget,%args) }; |
| 38 | last if $@; |
| 39 | push(@images,$img); |
| 40 | } |
| 41 | if (@images > 1) |
| 42 | { |
| 43 | $obj->add_frame(@images); |
| 44 | $obj->{'_frame_index_'} = 0; |
| 45 | } |
| 46 | } |
| 47 | return $obj; |
| 48 | } |
| 49 | |
| 50 | sub set_image |
| 51 | { |
| 52 | my ($obj,$index) = @_; |
| 53 | my $frames = $obj->{'_frames_'}; |
| 54 | return unless $frames && @$frames; |
| 55 | $index = 0 unless $index < @$frames; |
| 56 | $obj->copy($frames->[$index]); |
| 57 | $obj->{'_frame_index_'} = $index; |
| 58 | } |
| 59 | |
| 60 | sub next_image |
| 61 | { |
| 62 | my ($obj) = @_; |
| 63 | my $frames = $obj->{'_frames_'}; |
| 64 | return unless $frames && @$frames; |
| 65 | $obj->set_image((($obj->{'_frame_index_'} || 0)+1) % @$frames); |
| 66 | } |
| 67 | |
| 68 | sub start_animation |
| 69 | { |
| 70 | my ($obj,$period) = @_; |
| 71 | my $frames = $obj->{'_frames_'}; |
| 72 | return unless $frames && @$frames; |
| 73 | my $w = $obj->MainWindow; |
| 74 | $obj->stop_animation; |
| 75 | $obj->{'_NextId_'} = $w->repeat($period,[$obj,'next_image']); |
| 76 | } |
| 77 | |
| 78 | sub stop_animation |
| 79 | { |
| 80 | my ($obj) = @_; |
| 81 | my $id = delete $obj->{'_NextId_'}; |
| 82 | Tk::catch { $id->cancel } if $id; |
| 83 | $obj->set_image(0); |
| 84 | } |
| 85 | |
| 86 | 1; |
| 87 | __END__ |
| 88 | |
| 89 | =cut |
| 90 | |
| 91 | # |
| 92 | # This almost works for changing the animation on the fly |
| 93 | # but does not resize things correctly |
| 94 | # |
| 95 | |
| 96 | sub gif_sequence |
| 97 | { |
| 98 | my ($obj,%args) = @_; |
| 99 | my $widget = $obj->MainWindow; |
| 100 | my @images; |
| 101 | local $@; |
| 102 | while (1) |
| 103 | { |
| 104 | my $index = @images; |
| 105 | $args{'-format'} = "gif -index $index"; |
| 106 | my $img; |
| 107 | eval |
| 108 | {local $SIG{'__DIE__'}; |
| 109 | my $img = $widget->Photo(%args); |
| 110 | push(@images,$img); |
| 111 | }; |
| 112 | last if $@; |
| 113 | } |
| 114 | if (@images) |
| 115 | { |
| 116 | delete $obj->{'_frames_'}; |
| 117 | $obj->add_frame(@images); |
| 118 | $obj->configure(-width => 0, -height => 0); |
| 119 | $obj->set_frame(0); |
| 120 | } |
| 121 | } |
| 122 | |