Add auto-advance to media object manifests

app/models/iiif_manifest_presenter.rb

@@ -77,6 +77,10 @@ def homepage
     ]
   end
 
+  def viewing_hint
+    ["auto-advance"]
+  end
+
   def sequence_rendering
     supplemental_files_rendering(media_object)
   end
@@ -162,7 +166,7 @@ def display_summary(media_object)
   def series_url(series)
     Rails.application.routes.url_helpers.blacklight_url({ "f[collection_ssim][]" => media_object.collection.name, "f[series_ssim][]" => series })
   end
-  
+
   def display_lending_period(media_object)
     return nil unless lending_enabled
     ActiveSupport::Duration.build(media_object.lending_period).to_day_hour_s

spec/models/iiif_manifest_presenter_spec.rb

@@ -78,6 +78,14 @@
     end
   end
 
+  context 'viewing_hint' do
+    subject { presenter.viewing_hint }
+
+    it 'includes auto-advance' do
+      expect(subject).to include 'auto-advance'
+    end
+  end
+
   describe '#sequence_rendering' do
     let(:media_object) { FactoryBot.build(:fully_searchable_media_object, supplemental_files_json: supplemental_files_json) }
     let(:supplemental_file) { FactoryBot.create(:supplemental_file) }