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);
45 my $head = $self->vp_head;
46 confess "Can't pop from empty focus stack" unless defined($head);
47 my $vp = $self->vp_tail;
52 $self->vp_tail($vp->outer);
54 $self->vp_count($self->vp_count - 1);
57 sub pop_viewports_to {
59 1 while ($self->pop_viewport ne $vp);
64 my $vp = $self->vp_tail;
66 $vp->apply_events(@_);
72 __PACKAGE__->meta->make_immutable;
79 Reaction::UI::FocusStack - A linked list of ViewPort-based objects
83 my $stack = Reaction::UI::FocusStack->new();
85 # Or more commonly, in a Reaction::UI::RootController based
86 # Catalyst Controller:
87 my $stack = $ctx->focus_stack;
89 # Add a new basic viewport inside the last viewport on the stack:
90 my $vp = $stack->push_viewport('Reaction::UI::ViewPort' =>
94 # Fetch the innermost viewport from the stack:
95 my $vp = $stack->pop_viewport();
97 # Remove all viewports inside a given viewport:
98 $stack->pop_viewports_to($vp);
100 # Create a named stack as a tangent to an existing viewport:
101 my $newstack = $vp->create_tangent('somename');
103 # Resolve current events using your stack:
104 # This is called by Reaction::UI::RootController in the end action.
105 $stack->apply_events($ctx, $param_hash);
109 A FocusStack represents a list of related L<ViewPort|Reaction::UI::ViewPort>
110 objects. The L<Reaction::UI::RootController> creates an empty stack for you in
111 it's begin action, which represents the main thread/container of the page.
112 Typically you add new ViewPorts to this stack as the main parts of your page.
113 To add multiple parallel page subparts, create a tangent from the outer
114 viewport, and add more viewports as normal.
122 =item Arguments: none
126 Create a new empty FocusStack. This is done for you in
127 L<Reaction::UI::RootController>.
133 =item Arguments: $class, %options
137 Creates a new L<Reaction::UI::ViewPort> based object and adds it to the stack.
139 The following attributes of the new ViewPort are set:
145 Is set to the preceding ViewPort in the stack.
149 Is set to the FocusStack object that created the ViewPort.
153 Is set to the location of the ViewPort in the stack.
161 =item Arguments: none
165 Removes the last/innermost ViewPort from the stack and returns it.
167 =head2 pop_viewports_to
171 =item Arguments: $viewport
175 Pops all ViewPorts off the stack until the given ViewPort object
176 remains as the last item. If passed a $viewport not on the stack, this
177 will empty the stack completely (and then die complainingly).
179 TODO: Should pop_viewports_to check $vp->focus_stack eq $self first?
185 =item Arguments: none
189 Retrieve the first ViewPort in this stack. Useful for calling
190 L<Reaction::UI::Window/render_viewport> on a
191 L<Reaction::UI::ViewPort/focus_tangent>.
197 =item Arguments: none
201 Retrieve the first ViewPort in this stack. Useful for calling
202 L<Reaction::UI::Window/render_viewport> on a
203 L<Reaction::UI::ViewPort/focus_tangent>.
209 =item Arguments: none
213 Retrieve the last ViewPort in this stack. Useful for calling
214 L<Reaction::UI::Window/render_viewport> on a
215 L<Reaction::UI::ViewPort/focus_tangent>.
221 =item Arguments: none
231 =item Arguments: $ctx, $params_hashref
235 Instruct each of the ViewPorts in the stack to apply the given events
236 to each of it's tangent stacks, and then to itself. These are applied
237 starting with the last/innermost ViewPort first.
241 See L<Reaction::Class> for authors.
245 See L<Reaction::Class> for the license.