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 $items if not defined $spec;
127 if (ref $spec eq 'ARRAY') {
130 elsif (not ref $spec) {
131 return $items unless length $spec;
132 @order = split /\s+/, $spec;
135 my %order_map = map {$_ => 0} @$items;
136 for my $order_num (0..$#order) {
137 $order_map{ $order[$order_num] } = ($#order - $order_num) + 1;
140 return [sort {$order_map{$b} <=> $order_map{$a}} @$items];
143 __PACKAGE__->meta->make_immutable;
151 Reaction::UI::ViewPort - Page layout building block
155 # Create a new ViewPort:
156 # $stack isa Reaction::UI::FocusStack object
157 my $vp = $stack->push_viewport('Reaction::UI::ViewPort', layout => 'xthml');
159 # Fetch ViewPort higher up the stack (further out)
160 my $outer = $vp->outer();
162 # Fetch ViewPort lower down (further in)
163 my $inner = $vp->inner();
165 # Create a named tangent stack for this ViewPort
166 my $substack = $vp->create_tangent('name');
168 # Retrieve a tangent stack for this ViewPort
169 my $substack = $vp->forcus_tangent('name');
171 # Get the names of all the tangent stacks for this ViewPort
172 my @names = $vp->focus_tangents();
174 # Fetch all the tangent stacks for this ViewPort
175 # This is called by apply_events
176 my $stacks = $vp->child_event_sinks();
179 ### The following methods are all called automatically when using
180 ### Reaction::UI::Controller(s)
181 # Resolve current events with this ViewPort
182 $vp->apply_events($ctx, $param_hash);
184 # Apply current events to all tangent stacks
185 # This is called by apply_events
186 $vp->apply_child_events($ctx, $params_hash);
188 # Apply current events to this ViewPort
189 # This is called by apply_events
190 $vp->apply_our_events($ctx, $params_hash);
194 A ViewPort describes part of a page, it can be a field, a form or
195 an entire page. ViewPorts are created on a
196 L<Reaction::UI::FocusStack>, usually belonging to a controller or
197 another ViewPort. Each ViewPort knows it's own position in the stack
198 it is in, as well as the stack containing it.
200 Each ViewPort has a specific location in the heirarchy of viewports
201 making up a page. The hierarchy is determined as follows: The first
202 ViewPort in a stack is labeled C<0>, the second is C<1> and so on. If
203 a ViewPort is in a named tangent, it's location will contain the name
204 of the tangent in it's location.
206 For example, the first ViewPort in the 'left' tangent of the main
207 ViewPort has location C<0.left.0>.
209 Several ViewPort attributes are set by
210 L<Reaction::UI::FocusStack/push_viewport> when new ViewPorts are
211 created, these are as follows:
221 The outer attribute is set to the previous ViewPort in the stack when
222 creating a ViewPort, if the ViewPort is the first in the stack, it
227 The inner attribute is set to the next ViewPort down in the stack when
228 it is created, if this is the last ViewPort in the stack, it will be
233 The focus_stack attribute is set to the L<Reaction::UI::FocusStack>
234 object that created the ViewPort.
238 The ctx attribute will be passed automatically when using
239 L<Reaction::UI::Controller/push_viewport> to create a ViewPort in the
240 base stack of a controller. When creating tangent stacks, you may have
241 to pass it in yourself.
253 The layout attribute can either be specifically passed when calling
254 C<push_viewport>, or it will be determined using the last part of the
259 This is generally used by more specialised ViewPorts such as the
260 L<ListView|Reaction::UI::ViewPort::ListView> or
261 L<Action|Reaction::UI::ViewPort::Action>. It can be either a
262 space separated list of column names, or an arrayref of column names.
274 =item Arguments: none
278 Fetch the ViewPort outside this one in the page hierarchy.
284 =item Arguments: none
288 Fetch the ViewPort inside this one in the page hierarchy.
290 =head2 create_tangent
294 =item Arguments: $tangent_name
298 Create a new named L<Reaction::UI::FocusStack> inside this
299 ViewPort. The created FocusStack is returned.
305 =item Arguments: $tangent_name
309 Fetch a named FocusStack from this ViewPort.
311 =head2 focus_tangents
315 =item Arguments: none
319 Returns a list of names of all the known tangents in this ViewPort.
323 Return the L<Reaction::UI::FocusStack> object that this ViewPort is in.
329 =item Arguments: $ctx, $params_hashref
333 This method is called by the FocusStack object to resolve all events
336 =head2 apply_child_events
340 =item Arguments: $ctx, $params_hashref
344 Resolve the given events for all the tangents of this ViewPort. Called
347 =head2 apply_our_events
351 =item Arguments: $ctx, $events
355 Resolve the given events that match the location of this
356 ViewPort. Called by L<apply_events>.
362 =item Arguments: $events
366 Actually call the event handlers for this ViewPort. Called by
367 L<apply_our_events>. By default this will do nothing, subclass
368 ViewPort and implement L<accept_events>.
374 =item Arguments: none
378 Implement this method in a subclass and return a list of events that
379 your ViewPort is accepting.
385 =item Arguments: $name
389 Create an id for the given event name and this ViewPort. Generally
390 returns the location and the name, joined with a colon.
396 =item Arguments: $spec, $items
400 Sorts the given list of items such that the ones that also appear in
401 the spec are at the beginning. This is called by
402 L<Reaction::UI::ViewPort::Action> and
403 L<Reaction::UI::ViewPort::ListView>, and gets passed L<column_order>
404 as the spec argument.
408 See L<Reaction::Class> for authors.
412 See L<Reaction::Class> for the license.