+ $self->invalidate_version
+ ->jstree->delete_node('#tree', '#fb-' . $self->item->id)
+ ->render($self);
+}
+
+sub action_ajax_flag {
+ my ($self) = @_;
+
+ $self->item->update_attributes(is_flagged => !$self->item->is_flagged);
+
+ $self->js
+ ->action_if($self->is_item_visible, 'toggleClass', '#' . $self->item->item_type . '-' . $self->item->id, 'flagged')
+ ->toggleClass('#fb-' . $self->item->id, 'flagged')
+ ->render($self);
+}
+
+sub action_ajax_copy {
+ my ($self, %params) = @_;
+
+ SL::Clipboard->new->copy($self->item);
+ $self->render($self->js);
+}
+
+sub determine_paste_position {
+ my ($self) = @_;
+
+ if ($self->item->item_type eq 'section') {
+ # Sections are always pasted either directly after the
+ # clicked-upon section or at the very end.
+ return $self->clicked_item ? (undef, $self->clicked_item->section->id) : ();
+
+ } elsif ($self->item->item_type eq 'function-block') {
+ # A function block:
+ # - paste on section list: insert into last section as last element
+ # - paste on section: insert into that section as last element
+ # - paste on function block: insert after clicked-upon element
+ # - paste on sub function block: insert after parent function block of clicked-upon element
+ return !$self->clicked_item ? ( $self->sections->[-1]->id, undef )
+ : $self->clicked_item->item_type eq 'section' ? ( $self->clicked_item->id, undef )
+ : $self->clicked_item->item_type eq 'function-block' ? ( $self->clicked_item->parent_id, $self->clicked_item->id )
+ : ( $self->clicked_item->parent->parent_id, $self->clicked_item->parent_id );
+
+ } else { # sub-function-block
+ # A sub function block:
+ # - paste on section list: promote to function block and insert into last section as last element
+ # - paste on section: promote to function block and insert into that section as last element
+ # - paste on function block: insert as last element in clicked-upon element
+ # - paste on sub function block: insert after clicked-upon element
+
+ # Promote sub function blocks to function blocks when pasting on a
+ # section or the section list.
+ $self->item->item_type('function-block') if !$self->clicked_item || ($self->clicked_item->item_type eq 'section');
+
+ return !$self->clicked_item ? ( $self->sections->[-1]->id, undef )
+ : $self->clicked_item->item_type eq 'section' ? ( $self->clicked_item->id, undef )
+ : $self->clicked_item->item_type eq 'function-block' ? ( $self->clicked_item->id, undef )
+ : ( $self->clicked_item->parent_id, $self->clicked_item->id );
+ }
+}
+
+sub assign_requirement_spec_id_rec {
+ my ($self, $item) = @_;
+
+ $item->assign_attributes(requirement_spec_id => $::form->{requirement_spec_id}, fb_number => undef);
+ $self->assign_requirement_spec_id_rec($_) for @{ $item->children || [] };
+
+ return $item;
+}
+
+sub create_and_insert_node_rec {
+ my ($self, $item, $new_parent_id, $insert_after) = @_;
+
+ my $node = $self->presenter->requirement_spec_item_jstree_data($item);
+ $self->js->jstree->create_node('#tree', $insert_after ? ('#fb-' . $insert_after, 'after') : $new_parent_id ? ('#fb-' . $new_parent_id, 'last') : ('#sections', 'last'), $node);
+
+ $self->create_and_insert_node_rec($_, $item->id) for @{ $item->children || [] };
+
+ $self->js->jstree->open_node('#tree', '#fb-' . $item->id);
+}
+
+sub action_ajax_paste {
+ my ($self, %params) = @_;
+
+ my $copied = SL::Clipboard->new->get_entry(qr/^RequirementSpecItem$/);
+
+ if (!$copied) {
+ return $self->js->error(t8("The clipboard does not contain anything that can be pasted here."))
+ ->render($self);
+ }
+
+ $self->item($self->assign_requirement_spec_id_rec($copied->to_object));
+ my $req_spec = SL::DB::RequirementSpec->new(id => $::form->{requirement_spec_id})->load;
+ $self->sections($req_spec->sections);
+
+ if (($self->item->item_type ne 'section') && !@{ $self->sections }) {
+ return $self->js->error(t8("You cannot paste function blocks or sub function blocks if there is no section."))
+ ->render($self);
+ }
+
+ $self->clicked_item($::form->{id} ? SL::DB::RequirementSpecItem->new(id => $::form->{id})->load : undef);
+
+ my ($new_parent_id, $insert_after) = $self->determine_paste_position;
+
+ # Store result in database.
+ $self->item->update_attributes(parent_id => $new_parent_id);
+ $self->item->add_to_list(position => 'after', reference => $insert_after) if $insert_after;
+
+ # Update the tree: create the node for all pasted objects.
+ $self->create_and_insert_node_rec($self->item, $new_parent_id, $insert_after);
+
+ # Pasting the very first section?
+ if (!@{ $self->sections }) {
+ my $html = $self->render('requirement_spec_item/_section', { output => 0 }, requirement_spec_item => $self->item);
+ $self->set_function_blocks_tab_menu_class(class => 'section-context-menu')
+ ->html('#column-content', $html)
+ ->jstree->select_node('#tree', '#fb-' . $self->item->id)
+ }
+
+ # Update the current view if required.
+ $self->insert_new_item_in_section_view($self->js) if $self->is_item_visible;
+
+ $self->invalidate_version->render($self);