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package MTools::Anim::MOpacity;
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU LGPL Libray General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA,
# or refer to http://www.gnu.org/copyleft/lgpl.html
#
##################################################################
# MOpacity permet de realiser une animation sur la transparence d'un objet
#
# proprietes :
# * -visible : permet d'activer ou stopper l'animation
# * from_opacity : valeur initiale de l'opacite au depart de l'animation
# * to_opacity : valeur de l'opacite a la fin de l'animation
# * duration : duree de l'animation
# * loop : marque le caractere repetitif ou non de l'animation
# * targets : objet ou tableau d'objets cible de cette animation (de type MGroup ou autre type avec un attribut -alpha.
# Evenements :
# * ANIMATION_END : Notifie lorque l'annimation se termine
# * OPACITY_CHANGED : Notifie lorsque la valeur de l'opacite est changee au cours de l'animation
# * ANIMATION_ABORD : Notifie lorsque l'animation est stoppee avant la fin
# Fonctions :
# * start : demarre l'animation
# * stop: arrete l'animation
# * isRunning : test si l'animation est en cours
use strict;
use MTools;
use MTools::MObjet;
use Anim;
use Anim::Pacing::Linear;
use Anim::Path::Rectilinear;
use vars qw /@ISA/;
BEGIN
{
@ISA = qw /MTools::MObjet/;
}
use Tk;
sub new {
my ($class, %options) = @_;
my $self = new MTools::MObjet ();
bless $self, $class;
$self -> recordProperty ('-visible', 0);
$self -> recordProperty ('from_opacity', 0);
$self -> recordProperty ('to_opacity', 0);
$self -> recordProperty ('duration', 1);
$self -> recordProperty ('loop', 0);
$self -> recordProperty ('targets', undef);
$self -> recordEvent ('ANIMATION_END');
$self -> recordEvent ('OPACITY_CHANGED');
$self -> recordEvent ('ANIMATION_ABORD');
$self -> plisten ('-visible', sub {
my ($src, $key, $val) = @_;
if ($val == 0)
{
$self -> stop ();
}
else
{
$self -> start ();
}
});
$self -> {__animation} = undef;
$self -> mconfigure (%options);
return $self;
}
sub start {
my ($self) = @_;
my $pacing = new Anim::Pacing::Linear (-duration => $self -> mget ('duration'));
$self -> {__opacitydep} = my $opacitydep = $self -> mget ('from_opacity');
my $animationpath = new Anim::Path::Rectilinear (
-xdep => 0,
-ydep => 0,
-xdest => $self -> mget ('to_opacity') - $opacitydep,
-ydest => 0,
);
$self -> {__opacity} = $opacitydep;
$self -> {__animation} = my $animation = new Anim (
-pacing => $pacing,
-resources => [
$animationpath,
-command => sub { $self -> __event (@_)},
-endcommand => sub {$self -> {__animation} = undef;
$self -> notify ('ANIMATION_END');},
],
-stopcommand => sub {$self -> {__animation} = undef;
$self -> notify ('ANIMATION_ABORD', $self -> {__opacity});},
-loop => $self -> mget ('loop'),
);
$animation -> start ();
}
sub stop {
my ($self) = @_;
if (defined $self -> {__animation})
{
$self -> {__animation} -> stop ();
}
}
sub __event {
my ($self, $opacity) = @_;
$opacity += $self -> {__opacitydep};
my @targets = ();
my $target = $self -> mget ('targets');
if (ref ($target) eq 'ARRAY')
{
@targets = @{$target};
}
else
{
push (@targets, $target);
}
for (my $i = 0; $i < @targets; $i++)
{
if (ref($targets [$i]) eq '')
{
mconfigure ($targets[$i], '-alpha' => $opacity);
}
else
{
$targets [$i] -> mconfigure ('-alpha' => $opacity);
}
}
$self -> {__opacity} = $opacity;
$self -> notify ('OPACITY_CHANGED', $opacity);
}
sub isRunning {
my ($self) = @_;
return defined $self -> {__animation};
}
1;
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