1 package Reaction::UI::ViewPort;
4 use Scalar::Util qw/blessed/;
6 use namespace::clean -except => [ qw(meta) ];
9 sub DEBUG_EVENTS () { $ENV{REACTION_UI_VIEWPORT_DEBUG_EVENTS} }
11 has location => (isa => 'Str', is => 'rw', required => 1);
12 has layout => (isa => 'Str', is => 'rw', lazy_build => 1);
13 has layout_args => (isa => 'HashRef', is => 'ro', default => sub { {} });
14 has outer => (isa => 'Reaction::UI::ViewPort', is => 'rw', weak_ref => 1);
15 has inner => (isa => 'Reaction::UI::ViewPort', is => 'rw');
17 isa => 'Reaction::UI::FocusStack', is => 'rw', weak_ref => 1
19 has _tangent_stacks => (
20 isa => 'HashRef', is => 'ro', default => sub { {} }
22 has ctx => (isa => 'Catalyst', is => 'ro'); #, required => 1);
29 my ($self, $name) = @_;
30 my $t_map = $self->_tangent_stacks;
31 if (exists $t_map->{$name}) {
32 confess "Can't create tangent with already existing name ${name}";
34 my $loc = join('.', $self->location, $name);
35 my $tangent = Reaction::UI::FocusStack->new(loc_prefix => $loc);
36 $t_map->{$name} = $tangent;
41 my ($self, $name) = @_;
42 if (my $tangent = $self->_tangent_stacks->{$name}) {
50 return keys %{shift->_tangent_stacks};
53 sub child_event_sinks {
55 return values %{$self->_tangent_stacks};
59 my ($self, $events) = @_;
60 return unless keys %$events;
61 $self->apply_child_events($events);
62 $self->apply_our_events($events);
65 sub apply_child_events {
66 my ($self, $events) = @_;
67 return unless keys %$events;
68 foreach my $child ($self->child_event_sinks) {
69 confess blessed($child) ."($child) is not a valid object"
70 unless blessed($child) && $child->can('apply_events');
71 $child->apply_events($events);
75 sub apply_our_events {
76 my ($self, $events) = @_;
77 my @keys = keys %$events;
79 my $loc = $self->location;
81 foreach my $key (keys %$events) {
82 if ($key =~ m/^${loc}:(.*)$/) {
83 $our_events{$1} = $events->{$key};
86 if (keys %our_events) {
87 #warn "$self: events ".join(', ', %our_events)."\n";
88 $self->handle_events(\%our_events);
93 my ($self, $events) = @_;
94 my $exists = exists $events->{exists};
96 my %force = $self->force_events;
97 my @need = grep { !exists $events->{$_} } keys %force;
98 @{$events}{@need} = @force{@need};
100 foreach my $event ($self->accept_events) {
101 if (exists $events->{$event}) {
103 my $name = join(' at ', $self, $self->location);
105 "Applying Event: $event on $name with value: "
106 .(defined $events->{$event} ? $events->{$event} : '<undef>');
108 $self->$event($events->{$event});
113 sub accept_events { () }
115 sub force_events { () }
118 my ($self, $name) = @_;
119 return join(':', $self->location, $name);
123 my ($self, $spec, $items) = @_;
124 return [sort @$items] unless $spec;
127 if (ref $spec eq 'ARRAY') {
129 } elsif (not ref $spec) {
130 @order = split /\s+/, $spec;
133 my %order_map = map {$_ => 0} @$items;
134 for my $order_num (0..$#order) {
135 $order_map{ $order[$order_num] } = ($#order - $order_num) + 1;
138 return [sort {$order_map{$b} <=> $order_map{$a}} @$items];
141 __PACKAGE__->meta->make_immutable;
149 Reaction::UI::ViewPort - Page layout building block
153 # Create a new ViewPort:
154 # $stack isa Reaction::UI::FocusStack object
155 my $vp = $stack->push_viewport('Reaction::UI::ViewPort', layout => 'xthml');
157 # Fetch ViewPort higher up the stack (further out)
158 my $outer = $vp->outer();
160 # Fetch ViewPort lower down (further in)
161 my $inner = $vp->inner();
163 # Create a named tangent stack for this ViewPort
164 my $substack = $vp->create_tangent('name');
166 # Retrieve a tangent stack for this ViewPort
167 my $substack = $vp->forcus_tangent('name');
169 # Get the names of all the tangent stacks for this ViewPort
170 my @names = $vp->focus_tangents();
172 # Fetch all the tangent stacks for this ViewPort
173 # This is called by apply_events
174 my $stacks = $vp->child_event_sinks();
177 ### The following methods are all called automatically when using
178 ### Reaction::UI::Controller(s)
179 # Resolve current events with this ViewPort
180 $vp->apply_events($ctx, $param_hash);
182 # Apply current events to all tangent stacks
183 # This is called by apply_events
184 $vp->apply_child_events($ctx, $params_hash);
186 # Apply current events to this ViewPort
187 # This is called by apply_events
188 $vp->apply_our_events($ctx, $params_hash);
192 A ViewPort describes part of a page, it can be a field, a form or
193 an entire page. ViewPorts are created on a
194 L<Reaction::UI::FocusStack>, usually belonging to a controller or
195 another ViewPort. Each ViewPort knows it's own position in the stack
196 it is in, as well as the stack containing it.
198 Each ViewPort has a specific location in the heirarchy of viewports
199 making up a page. The hierarchy is determined as follows: The first
200 ViewPort in a stack is labeled C<0>, the second is C<1> and so on. If
201 a ViewPort is in a named tangent, it's location will contain the name
202 of the tangent in it's location.
204 For example, the first ViewPort in the 'left' tangent of the main
205 ViewPort has location C<0.left.0>.
207 Several ViewPort attributes are set by
208 L<Reaction::UI::FocusStack/push_viewport> when new ViewPorts are
209 created, these are as follows:
219 The outer attribute is set to the previous ViewPort in the stack when
220 creating a ViewPort, if the ViewPort is the first in the stack, it
225 The inner attribute is set to the next ViewPort down in the stack when
226 it is created, if this is the last ViewPort in the stack, it will be
231 The focus_stack attribute is set to the L<Reaction::UI::FocusStack>
232 object that created the ViewPort.
236 The ctx attribute will be passed automatically when using
237 L<Reaction::UI::Controller/push_viewport> to create a ViewPort in the
238 base stack of a controller. When creating tangent stacks, you may have
239 to pass it in yourself.
251 The layout attribute can either be specifically passed when calling
252 C<push_viewport>, or it will be determined using the last part of the
257 This is generally used by more specialised ViewPorts such as the
258 L<ListView|Reaction::UI::ViewPort::ListView> or
259 L<Action|Reaction::UI::ViewPort::Action>. It can be either a
260 space separated list of column names, or an arrayref of column names.
272 =item Arguments: none
276 Fetch the ViewPort outside this one in the page hierarchy.
282 =item Arguments: none
286 Fetch the ViewPort inside this one in the page hierarchy.
288 =head2 create_tangent
292 =item Arguments: $tangent_name
296 Create a new named L<Reaction::UI::FocusStack> inside this
297 ViewPort. The created FocusStack is returned.
303 =item Arguments: $tangent_name
307 Fetch a named FocusStack from this ViewPort.
309 =head2 focus_tangents
313 =item Arguments: none
317 Returns a list of names of all the known tangents in this ViewPort.
321 Return the L<Reaction::UI::FocusStack> object that this ViewPort is in.
327 =item Arguments: $ctx, $params_hashref
331 This method is called by the FocusStack object to resolve all events
334 =head2 apply_child_events
338 =item Arguments: $ctx, $params_hashref
342 Resolve the given events for all the tangents of this ViewPort. Called
345 =head2 apply_our_events
349 =item Arguments: $ctx, $events
353 Resolve the given events that match the location of this
354 ViewPort. Called by L<apply_events>.
360 =item Arguments: $events
364 Actually call the event handlers for this ViewPort. Called by
365 L<apply_our_events>. By default this will do nothing, subclass
366 ViewPort and implement L<accept_events>.
372 =item Arguments: none
376 Implement this method in a subclass and return a list of events that
377 your ViewPort is accepting.
383 =item Arguments: $name
387 Create an id for the given event name and this ViewPort. Generally
388 returns the location and the name, joined with a colon.
394 =item Arguments: $spec, $items
398 Sorts the given list of items such that the ones that also appear in
399 the spec are at the beginning. This is called by
400 L<Reaction::UI::ViewPort::Action> and
401 L<Reaction::UI::ViewPort::ListView>, and gets passed L<column_order>
402 as the spec argument.
406 See L<Reaction::Class> for authors.
410 See L<Reaction::Class> for the license.