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1 | package Reaction::UI::ViewPort::Field::Role::Mutable; |
2 | |
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3 | use Reaction::Role; |
4 | |
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5 | use aliased 'Reaction::InterfaceModel::Action'; |
6 | use aliased 'Reaction::Meta::InterfaceModel::Action::ParameterAttribute'; |
7 | |
8 | role Mutable, which { |
9 | has model => (is => 'ro', isa => Action, required => 1); |
10 | has attribute => (is => 'ro', isa => ParameterAttribute, required => 1); |
11 | |
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12 | has value => ( |
13 | is => 'rw', lazy_build => 1, trigger_adopt('value'), |
14 | clearer => 'clear_value', |
15 | ); |
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16 | has needs_sync => (is => 'rw', isa => 'Int', default => 0); |
17 | has message => (is => 'rw', isa => 'Str'); |
18 | |
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19 | around value => sub { |
20 | my $orig = shift; |
21 | my $self = shift; |
22 | if (@_ && !ref($_[0]) && defined($_[0]) && !length($_[0])) { # '' |
23 | unless ($self->value_is_required) { |
24 | return $self->clear_value; |
25 | } |
26 | } |
27 | $self->$orig(@_); |
28 | }; |
29 | |
30 | after clear_value => sub { |
31 | shift->needs_sync(1); |
32 | }; |
33 | |
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34 | implements adopt_value => as { |
35 | my ($self) = @_; |
36 | $self->needs_sync(1); # if $self->has_attribute; |
37 | }; |
38 | |
39 | implements sync_to_action => as { |
40 | my ($self) = @_; |
41 | return unless $self->needs_sync && $self->has_value; |
42 | my $attr = $self->attribute; |
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43 | |
44 | if ($self->has_value) { |
45 | my $value = $self->value; |
46 | if (my $tc = $attr->type_constraint) { |
47 | $value = $tc->coercion->coerce($value) if ($tc->has_coercion); |
48 | #my $error = $tc->validate($self->value); # should we be checking against $value? |
49 | my $error = $tc->validate($value); |
50 | if (defined $error) { |
51 | $self->message($error); |
52 | return; |
53 | } |
54 | } |
55 | my $writer = $attr->get_write_method; |
56 | confess "No writer for attribute" unless defined($writer); |
57 | $self->model->$writer($value); |
58 | } else { |
59 | my $predicate = $attr->get_predicate; |
60 | confess "No predicate for attribute" unless defined($predicate); |
61 | if ($self->model->$predicate) { |
62 | my $clearer = $attr->get_clearer; |
63 | confess "${predicate} returned true but no clearer for attribute" |
64 | unless defined($clearer); |
65 | $self->model->$clearer; |
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66 | } |
67 | } |
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68 | $self->needs_sync(0); |
69 | }; |
70 | |
71 | implements sync_from_action => as { |
72 | my ($self) = @_; |
73 | return unless !$self->needs_sync; # && $self->has_attribute; |
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74 | $self->message($self->model->error_for($self->attribute) || ''); |
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75 | }; |
76 | |
77 | around accept_events => sub { ('value', shift->(@_)) }; |
78 | |
79 | }; |
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80 | |
81 | 1; |
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82 | |
83 | =head1 NAME |
84 | |
85 | Reaction::UI::ViewPort::Role::Actions |
86 | |
87 | =head1 DESCRIPTION |
88 | |
89 | A role to ease attaching actions to L<Reaction::InterfaceModel::Object>s |
90 | |
91 | =head1 ATTRIBUTES |
92 | |
93 | =head2 needs_sync |
94 | |
95 | =head2 message |
96 | |
97 | =head2 model |
98 | |
99 | =head2 attribute |
100 | |
101 | =head2 value |
102 | |
103 | =head1 METHODS |
104 | |
105 | =head2 accept_events |
106 | |
107 | =head2 sync_from_action |
108 | |
109 | =head2 sync_to_action |
110 | |
111 | =head2 adopt_value |
112 | |
113 | =head1 AUTHORS |
114 | |
115 | See L<Reaction::Class> for authors. |
116 | |
117 | =head1 LICENSE |
118 | |
119 | See L<Reaction::Class> for the license. |
120 | |
121 | =cut |