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package Reaction::UI::ViewPort::Field::Role::Mutable;
use Reaction::Role;
use aliased 'Reaction::InterfaceModel::Action';
use aliased 'Reaction::Meta::InterfaceModel::Action::ParameterAttribute';
role Mutable, which {
has model => (is => 'ro', isa => Action, required => 1);
has attribute => (is => 'ro', isa => ParameterAttribute, required => 1);
has value => (
is => 'rw', lazy_build => 1, trigger_adopt('value'),
clearer => 'clear_value',
);
has needs_sync => (is => 'rw', isa => 'Int', default => 0);
has message => (is => 'rw', isa => 'Str');
around value => sub {
my $orig = shift;
my $self = shift;
if (@_ && !ref($_[0]) && defined($_[0]) && !length($_[0])) { # ''
unless ($self->value_is_required) {
return $self->clear_value;
}
}
$self->$orig(@_);
};
after clear_value => sub {
shift->needs_sync(1);
};
implements adopt_value => as {
my ($self) = @_;
$self->needs_sync(1); # if $self->has_attribute;
};
implements sync_to_action => as {
my ($self) = @_;
return unless $self->needs_sync && $self->has_value;
my $attr = $self->attribute;
if ($self->has_value) {
my $value = $self->value;
if (my $tc = $attr->type_constraint) {
$value = $tc->coercion->coerce($value) if ($tc->has_coercion);
#my $error = $tc->validate($self->value); # should we be checking against $value?
my $error = $tc->validate($value);
if (defined $error) {
$self->message($error);
return;
}
}
my $writer = $attr->get_write_method;
confess "No writer for attribute" unless defined($writer);
$self->model->$writer($value);
} else {
my $predicate = $attr->get_predicate;
confess "No predicate for attribute" unless defined($predicate);
if ($self->model->$predicate) {
my $clearer = $attr->get_clearer;
confess "${predicate} returned true but no clearer for attribute"
unless defined($clearer);
$self->model->$clearer;
}
}
$self->needs_sync(0);
};
implements sync_from_action => as {
my ($self) = @_;
return unless !$self->needs_sync; # && $self->has_attribute;
$self->message($self->model->error_for($self->attribute) || '');
};
around accept_events => sub { ('value', shift->(@_)) };
};
1;
=head1 NAME
Reaction::UI::ViewPort::Role::Actions
=head1 DESCRIPTION
A role to ease attaching actions to L<Reaction::InterfaceModel::Object>s
=head1 ATTRIBUTES
=head2 needs_sync
=head2 message
=head2 model
=head2 attribute
=head2 value
=head1 METHODS
=head2 accept_events
=head2 sync_from_action
=head2 sync_to_action
=head2 adopt_value
=head1 AUTHORS
See L<Reaction::Class> for authors.
=head1 LICENSE
See L<Reaction::Class> for the license.
=cut
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