1 package Reaction::UI::FocusStack;
5 use namespace::clean -except => [ qw(meta) ];
9 isa => 'Reaction::UI::ViewPort', is => 'rw',
10 clearer => 'clear_vp_head',
13 isa => 'Reaction::UI::ViewPort', is => 'rw',
14 clearer => 'clear_vp_tail',
17 isa => 'Int', is => 'rw', required => 1, default => sub { 0 }
19 has loc_prefix => (isa => 'Str', is => 'rw', predicate => 'has_loc_prefix');
21 my ($self, $class, %create) = @_;
22 my $tail = $self->vp_tail;
23 my $loc = $self->vp_count;
24 if ($self->has_loc_prefix) {
25 $loc = join('-', $self->loc_prefix, $loc);
31 (defined $tail ? ( outer => $tail ) : ()), # XXX possibly a bug in
34 if ($tail) { # if we already have a tail (non-empty vp stack)
35 $tail->inner($vp); # set the current tail's inner vp to the new vp
36 } else { # else we're currently an empty stack
37 $self->vp_head($vp); # so set the head to the new vp
39 $self->vp_count($self->vp_count + 1);
46 my $head = $self->vp_head;
47 confess "Can't pop from empty focus stack" unless defined($head);
48 my $vp = $self->vp_tail;
53 $self->vp_tail($vp->outer);
55 $self->vp_count($self->vp_count - 1);
59 sub pop_viewports_to {
61 1 while ($self->pop_viewport ne $vp);
67 my $all_events = shift;
68 my $vp = $self->vp_tail;
70 while (defined $vp && keys %$all_events) {
71 my $loc = $vp->location;
72 my %vp_events = map { $_ => delete $all_events->{$_} }
73 grep { /^${loc}[-:]/ } keys %$all_events;
74 $vp->apply_events(\%vp_events);
80 __PACKAGE__->meta->make_immutable;
87 Reaction::UI::FocusStack - A linked list of ViewPort-based objects
91 my $stack = Reaction::UI::FocusStack->new();
93 # Or more commonly, in a Reaction::UI::RootController based
94 # Catalyst Controller:
95 my $stack = $ctx->focus_stack;
97 # Add a new basic viewport inside the last viewport on the stack:
98 my $vp = $stack->push_viewport('Reaction::UI::ViewPort' =>
102 # Fetch the innermost viewport from the stack:
103 my $vp = $stack->pop_viewport();
105 # Remove all viewports inside a given viewport:
106 $stack->pop_viewports_to($vp);
108 # Create a named stack as a tangent to an existing viewport:
109 my $newstack = $vp->create_tangent('somename');
111 # Resolve current events using your stack:
112 # This is called by Reaction::UI::RootController in the end action.
113 $stack->apply_events($ctx, $param_hash);
117 A FocusStack represents a list of related L<ViewPort|Reaction::UI::ViewPort>
118 objects. The L<Reaction::UI::RootController> creates an empty stack for you in
119 it's begin action, which represents the main thread/container of the page.
120 Typically you add new ViewPorts to this stack as the main parts of your page.
121 To add multiple parallel page subparts, create a tangent from the outer
122 viewport, and add more viewports as normal.
130 =item Arguments: none
134 Create a new empty FocusStack. This is done for you in
135 L<Reaction::UI::RootController>.
141 =item Arguments: $class, %options
145 Creates a new L<Reaction::UI::ViewPort> based object and adds it to the stack.
147 The following attributes of the new ViewPort are set:
153 Is set to the preceding ViewPort in the stack.
157 Is set to the FocusStack object that created the ViewPort.
161 Is set to the location of the ViewPort in the stack.
169 =item Arguments: none
173 Removes the last/innermost ViewPort from the stack and returns it.
175 =head2 pop_viewports_to
179 =item Arguments: $viewport
183 Pops all ViewPorts off the stack until the given ViewPort object
184 remains as the last item. If passed a $viewport not on the stack, this
185 will empty the stack completely (and then die complainingly).
187 TODO: Should pop_viewports_to check $vp->focus_stack eq $self first?
193 =item Arguments: none
197 Retrieve the first ViewPort in this stack. Useful for calling
198 L<Reaction::UI::Window/render_viewport> on a
199 L<Reaction::UI::ViewPort/focus_tangent>.
205 =item Arguments: none
209 Retrieve the first ViewPort in this stack. Useful for calling
210 L<Reaction::UI::Window/render_viewport> on a
211 L<Reaction::UI::ViewPort/focus_tangent>.
217 =item Arguments: none
221 Retrieve the last ViewPort in this stack. Useful for calling
222 L<Reaction::UI::Window/render_viewport> on a
223 L<Reaction::UI::ViewPort/focus_tangent>.
229 =item Arguments: none
239 =item Arguments: $ctx, $params_hashref
243 Instruct each of the ViewPorts in the stack to apply the given events
244 to each of it's tangent stacks, and then to itself. These are applied
245 starting with the last/innermost ViewPort first.
249 See L<Reaction::Class> for authors.
253 See L<Reaction::Class> for the license.