split out can_sync_to_action from sync_to_action in anticipation of new password...

[catagits/Reaction.git] / lib / Reaction / UI / ViewPort / Field / Role / Mutable.pm

diff --git a/lib/Reaction/UI/ViewPort/Field/Role/Mutable.pm b/lib/Reaction/UI/ViewPort/Field/Role/Mutable.pm
index 66a46cf..0d39eec 100644 (file)
--- a/lib/Reaction/UI/ViewPort/Field/Role/Mutable.pm
+++ b/lib/Reaction/UI/ViewPort/Field/Role/Mutable.pm
@@ -9,31 +9,72 @@ 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'));
+  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');
+  #predicates are autmagically generated for lazy and non-required attrs
+  has message => (is => 'rw', isa => 'Str', clearer => 'clear_message');
+
+  after clear_value => sub {
+    my $self = shift;
+    $self->clear_message if $self->has_message;
+    $self->needs_sync(1);
+  };
 
   implements adopt_value => as {
     my ($self) = @_;
+    $self->clear_message if $self->has_message;
     $self->needs_sync(1); # if $self->has_attribute;
   };
 
+  implements can_sync_to_action => as {
+    my $self = shift;
+    return 1 unless $self->needs_sync;
+    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);
+        if (defined (my $error = $tc->validate($value))) {
+          $self->message($error);
+          return;
+        }
+      }
+    } else {
+      return if $attr->is_required;
+    }
+    return 1;
+  };
+
   implements sync_to_action => as {
     my ($self) = @_;
-    return unless $self->needs_sync && $self->has_value;
+    return unless $self->needs_sync;
+    return unless $self->can_sync_to_action;
+
     my $attr = $self->attribute;
-    if (my $tc = $attr->type_constraint) {
+
+    if ($self->has_value) {
       my $value = $self->value;
-      $value = $tc->coercion->coerce($value) if ($tc->has_coercion);
-      my $error = $tc->validate($self->value); # should we be checking against $value?
-      if (defined $error) {
-        $self->message($error);
-        return;
+      if (my $tc = $attr->type_constraint) {
+        #this will go away when we have moose dbic. until then though...
+        $value = $tc->coercion->coerce($value) if ($tc->has_coercion);
+      }
+      my $writer = $attr->get_write_method;
+      confess "No writer for attribute" unless defined($writer);
+      $self->model->$writer($value);
+    } else {
+      my $predicate = $attr->predicate;
+      confess "No predicate for attribute" unless defined($predicate);
+      if ($self->model->$predicate) {
+        my $clearer = $attr->clearer;
+        confess "${predicate} returned true but no clearer for attribute"
+          unless defined($clearer);
+        $self->model->$clearer;
       }
     }
-    my $writer = $attr->get_write_method;
-    confess "No writer for attribute" unless defined($writer);
-    $self->model->$writer($self->value); #should we be passing $value ?
     $self->needs_sync(0);
   };
 
@@ -48,3 +89,43 @@ role Mutable, which {
 };
 
 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