Add a loader in the author list

Signed-off-by: Jay Wang <[email protected]>

Author: xiaohk

src/components/author-list/author-list.ts

@@ -12,6 +12,7 @@ import iconPerson from '../../images/icon-person.svg?raw';
 import componentCSS from './author-list.css?inline';
 
 const AUTHORS_PER_PAGE = 100;
+let authorDetailAPITimeout: number | null = null;
 
 /**
  * Author list element.
@@ -28,7 +29,6 @@ export class RecRecAuthorList extends LitElement {
   authorDetails: SemanticAuthorDetail[] = [];
 
   authorStartIndex = 0;
-  authorDetailAPIRetryID = 0;
 
   //==========================================================================||
   //                             Lifecycle Methods                            ||
@@ -81,35 +81,50 @@ export class RecRecAuthorList extends LitElement {
   //==========================================================================||
   //                             Private Helpers                              ||
   //==========================================================================||
-  async updateAuthorDetails(retry?: number, retryID?: number) {
+  async updateAuthorDetails(retry = 3) {
     if (this.authors.length === 0) {
       this.authorDetails = [];
       return;
     }
 
-    const retryNum = retry || 3;
+    this.updateIsSearching(true);
 
-    // Quit if a newer query has succeeded
-    if (retryID && retryID != this.authorDetailAPIRetryID) {
-      return;
-    }
-
-    // Record this query as the newest query
-    if (retryID === undefined) {
-      this.authorDetailAPIRetryID += 1;
+    if (authorDetailAPITimeout !== null) {
+      clearTimeout(authorDetailAPITimeout);
     }
 
     try {
       const data = await searchAuthorDetails(this.authors.map(d => d.authorId));
       this.authorDetails = data;
+      this.updateIsSearching(false);
     } catch (e) {
-      await new Promise<void>(resolve => {
-        setTimeout(resolve, 1000);
-      });
-      await this.updateAuthorDetails(retryNum - 1, this.authorDetailAPIRetryID);
+      // Try again after some delay
+      console.error(
+        `Author detail API failed with error (retry remain: ${retry}): ${e}`
+      );
+
+      if (retry > 0) {
+        authorDetailAPITimeout = setTimeout(() => {
+          this.updateAuthorDetails(retry - 1).then(
+            () => {},
+            () => {}
+          );
+        }, 1000);
+      } else {
+        this.updateIsSearching(false);
+      }
     }
   }
 
+  updateIsSearching(isSearching: boolean) {
+    const event = new CustomEvent<boolean>('is-searching-changed', {
+      bubbles: true,
+      composed: true,
+      detail: isSearching
+    });
+    this.dispatchEvent(event);
+  }
+
   //==========================================================================||
   //                           Templates and Styles                           ||
   //==========================================================================||

src/components/author-view/author-view.css

@@ -111,3 +111,34 @@ button {
     }
   }
 }
+
+.loader {
+  --stroke: 2px;
+
+  width: 128px;
+  aspect-ratio: 1;
+  border-radius: 50%;
+
+  background:
+    radial-gradient(farthest-side, var(--blue-700) 94%, #0000) top/var(--stroke)
+      var(--stroke) no-repeat,
+    conic-gradient(#0000 30%, var(--blue-700));
+
+  -webkit-mask: radial-gradient(
+    farthest-side,
+    #0000 calc(100% - var(--stroke)),
+    #000 0
+  );
+  animation: rotation 1200ms infinite linear;
+
+  &[is-hidden] {
+    visibility: hidden;
+    pointer-events: none;
+  }
+}
+
+@keyframes rotation {
+  100% {
+    transform: rotate(1turn);
+  }
+}

src/components/author-view/author-view.ts

@@ -8,6 +8,7 @@ import type {
   SemanticAuthorSearch,
   SemanticAuthorDetail
 } from '../../types/common-types';
+import type { RecRecAuthorList } from '../author-list/author-list';
 
 import '@shoelace-style/shoelace/dist/components/input/input.js';
 import '../header-bar/header-bar';
@@ -35,9 +36,15 @@ export class RecRecAuthorView extends LitElement {
   @state()
   showAuthorList = false;
 
+  @state()
+  isSearching = false;
+
   @query('sl-input')
   searchInputComponent: SlInput | undefined;
 
+  @query('recrec-author-list')
+  authorListComponent: RecRecAuthorList | undefined;
+
   //==========================================================================||
   //                             Lifecycle Methods                            ||
   //==========================================================================||
@@ -177,6 +184,9 @@ export class RecRecAuthorView extends LitElement {
               <div class="svg-icon search-icon" slot="prefix">
                 ${unsafeHTML(iconSearch)}
               </div>
+              <div class="svg-icon search-icon" slot="suffix">
+                <div class="loader" ?is-hidden=${!this.isSearching}></div>
+              </div>
             </sl-input>
           </div>
 
@@ -186,6 +196,9 @@ export class RecRecAuthorView extends LitElement {
               @author-row-clicked=${(e: CustomEvent<SemanticAuthorDetail>) => {
                 this.authorRowClickedHandler(e);
               }}
+              @is-searching-changed=${(e: CustomEvent<boolean>) => {
+                this.isSearching = e.detail;
+              }}
             ></recrec-author-list>
           </div>
         </div>