Add very basic expand/collapse for reply threads

src/sidebar/components/annotation-omega.js

@@ -3,7 +3,12 @@ import { useEffect, useState } from 'preact/hooks';
 import propTypes from 'prop-types';
 
 import useStore from '../store/use-store';
-import { isHighlight, isNew, quote } from '../util/annotation-metadata';
+import {
+  isHighlight,
+  isNew,
+  isReply,
+  quote,
+} from '../util/annotation-metadata';
 import { isShared } from '../util/permissions';
 import { withServices } from '../util/service-context';
 
@@ -13,6 +18,7 @@ import AnnotationHeader from './annotation-header';
 import AnnotationLicense from './annotation-license';
 import AnnotationPublishControl from './annotation-publish-control';
 import AnnotationQuote from './annotation-quote';
+import Button from './button';
 import TagEditor from './tag-editor';
 import TagList from './tag-list';
 
@@ -26,8 +32,10 @@ function AnnotationOmega({
   onReplyCountClick,
   replyCount,
   showDocumentInfo,
+  threadIsCollapsed,
 }) {
   const createDraft = useStore(store => store.createDraft);
+  const setCollapsed = useStore(store => store.setCollapsed);
 
   // An annotation will have a draft if it is being edited
   const draft = useStore(store => store.getDraft(annotation));
@@ -43,6 +51,9 @@ function AnnotationOmega({
   const [isSaving, setIsSaving] = useState(false);
   const isEditing = !!draft && !isSaving;
 
+  const toggleAction = threadIsCollapsed ? 'Show replies' : 'Hide replies';
+  const toggleText = `${toggleAction} (${replyCount})`;
+
   useEffect(() => {
     // TEMPORARY. Create a new draft for new (non-highlight) annotations
     // to put the component in "edit mode."
@@ -57,6 +68,7 @@ function AnnotationOmega({
 
   const shouldShowActions = !isEditing && !isNew(annotation);
   const shouldShowLicense = isEditing && !isPrivate && group.type !== 'private';
+  const shouldShowReplyToggle = replyCount > 0 && !isReply(annotation);
 
   const onEditTags = ({ tags }) => {
     createDraft(annotation, { ...draft, tags });
@@ -77,6 +89,8 @@ function AnnotationOmega({
     }
   };
 
+  const onToggleReplies = () => setCollapsed(annotation.id, !threadIsCollapsed);
+
   // TODO
   const fakeOnReply = () => alert('Reply: TBD');
 
@@ -109,14 +123,23 @@ function AnnotationOmega({
           )}
         </div>
         {shouldShowLicense && <AnnotationLicense />}
-        {shouldShowActions && (
-          <div className="annotation-actions">
-            <AnnotationActionBar
-              annotation={annotation}
-              onReply={fakeOnReply}
+        <div className="annotation-omega__controls">
+          {shouldShowReplyToggle && (
+            <Button
+              className="annotation-omega__reply-toggle"
+              onClick={onToggleReplies}
+              buttonText={toggleText}
             />
-          </div>
-        )}
+          )}
+          {shouldShowActions && (
+            <div className="annotation-omega__actions">
+              <AnnotationActionBar
+                annotation={annotation}
+                onReply={fakeOnReply}
+              />
+            </div>
+          )}
+        </div>
       </footer>
     </div>
   );
@@ -131,6 +154,8 @@ AnnotationOmega.propTypes = {
   replyCount: propTypes.number.isRequired,
   /** Should extended document info be rendered (e.g. in non-sidebar contexts)? */
   showDocumentInfo: propTypes.bool.isRequired,
+  /** Is the thread to which this annotation belongs currently collapsed? */
+  threadIsCollapsed: propTypes.bool.isRequired,
 
   /* Injected services */
   annotationsService: propTypes.object.isRequired,

src/sidebar/components/test/annotation-omega-test.js

@@ -42,6 +42,7 @@ describe('AnnotationOmega', () => {
         onReplyCountClick={fakeOnReplyCountClick}
         replyCount={0}
         showDocumentInfo={false}
+        threadIsCollapsed={true}
         {...props}
       />
     );
@@ -60,6 +61,7 @@ describe('AnnotationOmega', () => {
 
     fakeMetadata = {
       isNew: sinon.stub(),
+      isReply: sinon.stub(),
       quote: sinon.stub(),
     };
 
@@ -73,6 +75,7 @@ describe('AnnotationOmega', () => {
       getGroup: sinon.stub().returns({
         type: 'private',
       }),
+      setCollapsed: sinon.stub(),
     };
 
     $imports.$mock(mockImportedComponents());
@@ -268,6 +271,66 @@ describe('AnnotationOmega', () => {
     });
   });
 
+  describe('reply thread toggle button', () => {
+    const findRepliesButton = wrapper =>
+      wrapper.find('Button').filter('.annotation-omega__reply-toggle');
+
+    it('should render a toggle button if the annotation has replies', () => {
+      fakeMetadata.isReply.returns(false);
+      const wrapper = createComponent({
+        replyCount: 5,
+        threadIsCollapsed: true,
+      });
+
+      assert.isTrue(findRepliesButton(wrapper).exists());
+      assert.equal(
+        findRepliesButton(wrapper).props().buttonText,
+        'Show replies (5)'
+      );
+    });
+
+    it('should not render a toggle button if the annotation has no replies', () => {
+      fakeMetadata.isReply.returns(false);
+      const wrapper = createComponent({
+        replyCount: 0,
+        threadIsCollapsed: true,
+      });
+
+      assert.isFalse(findRepliesButton(wrapper).exists());
+    });
+
+    it('should not render a toggle button if the annotation itself is a reply', () => {
+      fakeMetadata.isReply.returns(true);
+      const wrapper = createComponent({
+        replyCount: 5,
+        threadIsCollapsed: true,
+      });
+
+      assert.isFalse(findRepliesButton(wrapper).exists());
+    });
+
+    it('should toggle the collapsed state of the thread on click', () => {
+      fakeMetadata.isReply.returns(false);
+      const wrapper = createComponent({
+        replyCount: 5,
+        threadIsCollapsed: true,
+      });
+
+      act(() => {
+        findRepliesButton(wrapper)
+          .props()
+          .onClick();
+      });
+      wrapper.setProps({ threadIsCollapsed: false });
+
+      assert.calledOnce(fakeStore.setCollapsed);
+      assert.equal(
+        findRepliesButton(wrapper).props().buttonText,
+        'Hide replies (5)'
+      );
+    });
+  });
+
   describe('annotation actions', () => {
     it('should show annotation actions', () => {
       const wrapper = createComponent();

src/sidebar/templates/annotation-thread.html

@@ -15,11 +15,12 @@
       ng-if="vm.thread.annotation">
     </moderation-banner>
     <div ng-if="vm.shouldShowAnnotationOmega()"><em>Viewing AnnotationOmega</em></div>
-    <annotation-omega ng-if="vm.shouldShowAnnotationOmega()"
+    <annotation-omega ng-if="vm.shouldShowAnnotationOmega() && vm.thread.annotation"
       annotation="vm.thread.annotation"
       reply-count="vm.thread.replyCount"
       on-reply-count-click="vm.toggleCollapsed()"
-      show-document-info="vm.showDocumentInfo">
+      show-document-info="vm.showDocumentInfo"
+      thread-is-collapsed="vm.thread.collapsed">
     </annotation-omega>
     <annotation ng-class="vm.annotationClasses()"
              annotation="vm.thread.annotation"

src/styles/sidebar/components/annotation-omega.scss

+.annotation-omega {
+  &__reply-toggle.button {
+    background-color: transparent;
+    padding: 0;
+    font-weight: 400;
+
+    &:hover {
+      background-color: transparent;
+      text-decoration: underline;
+    }
+  }
+
+  &__controls {
+    display: flex;
+  }
+
+  &__actions {
+    margin-left: auto;
+  }
+}

src/styles/sidebar/sidebar.scss

@@ -30,6 +30,7 @@
 @use './components/annotation-document-info';
 @use './components/annotation-header';
 @use './components/annotation-license';
+@use './components/annotation-omega';
 @use './components/annotation-publish-control';
 @use './components/annotation-quote';
 @use './components/annotation-share-control';