#4172 Allow SortOptions override to showRSS input

If a valid, complete SortOptions is passed to
the pagination component showRSS, it will be
used instead of the underlying sortOptions,
otherwise the pagination context sortOptions
will be used.

src/app/home-page/top-level-community-list/top-level-community-list.component.html

@@ -8,6 +8,7 @@
       <ds-viewable-collection
         [config]="config"
         [sortConfig]="sortConfig"
+        [showRSS]="rssSortConfig"
         [objects]="communitiesRD$ | async"
         [hideGear]="true">
       </ds-viewable-collection>

src/app/home-page/top-level-community-list/top-level-community-list.component.ts

@@ -65,9 +65,10 @@ export class TopLevelCommunityListComponent implements OnInit, OnDestroy {
   pageId = 'tl';
 
   /**
-   * The sorting configuration
+   * The sorting configuration for the community list itself, and the optional RSS feed button
    */
   sortConfig: SortOptions;
+  rssSortConfig: SortOptions;
 
   /**
    * The subscription to the observable for the current page.
@@ -84,6 +85,7 @@ export class TopLevelCommunityListComponent implements OnInit, OnDestroy {
     this.config.pageSize = appConfig.homePage.topLevelCommunityList.pageSize;
     this.config.currentPage = 1;
     this.sortConfig = new SortOptions('dc.title', SortDirection.ASC);
+    this.rssSortConfig = new SortOptions('dc.date.accessioned', SortDirection.DESC);
   }
 
   ngOnInit() {

src/app/shared/object-collection/object-collection.component.ts

@@ -85,7 +85,7 @@ export class ObjectCollectionComponent implements OnInit {
   /**
    * Whether to show an RSS syndication button for the current search options
    */
-  @Input() showRSS = false;
+  @Input() showRSS: SortOptions | boolean = false;
 
   /**
    * Emit custom event for listable object custom actions.

src/app/shared/object-detail/object-detail.component.ts

@@ -85,7 +85,10 @@ export class ObjectDetailComponent {
    */
   @Input() showThumbnails;
 
-  @Input() showRSS = false;
+  /**
+   * Whether to show the RSS syndication link. Either false, or valid SortOptions object
+   */
+  @Input() showRSS: SortOptions | boolean = false;
 
   /**
    * Emit when one of the listed object has changed.

src/app/shared/object-list/object-list.component.ts

@@ -73,7 +73,7 @@ export class ObjectListComponent {
   /**
    * Whether to show an RSS syndication button for the current search options
    */
-  @Input() showRSS = false;
+  @Input() showRSS: SortOptions | boolean = false;
 
   /**
    * The link type of the listable elements

src/app/shared/object-list/themed-object-list.component.ts

@@ -59,7 +59,7 @@ export class ThemedObjectListComponent extends ThemedComponent<ObjectListCompone
 
   @Input() selectionConfig: { repeatable: boolean, listId: string };
 
-  @Input() showRSS = false;
+  @Input() showRSS: SortOptions | boolean = false;
 
   /**
    * The link type of the listable elements

src/app/shared/pagination/pagination.component.html

@@ -44,7 +44,7 @@
               </div>
             }
             @if (showRSS) {
-              <ds-rss [sortConfig]="this.sortOptions"></ds-rss>
+              <ds-rss [sortConfig]="rssSortOptions"></ds-rss>
             }
           </div>
         </div>

src/app/shared/pagination/pagination.component.ts

@@ -173,7 +173,7 @@ export class PaginationComponent implements OnChanges, OnDestroy, OnInit {
    * or other lists where an RSS feed doesn't make sense, but uses the same components as recent items or search result
    * lists.
    */
-  @Input() public showRSS = false;
+  @Input() public showRSS: SortOptions | boolean = false;
 
   /**
    * Current page.
@@ -442,4 +442,19 @@ export class PaginationComponent implements OnChanges, OnDestroy, OnInit {
     });
   }
 
+  /**
+   * Get the sort options to use for the RSS feed. Defaults to the sort options used for this pagination component
+   * so it matches the search/browse context, but also allows more flexibility if, for example a top-level community
+   * list is displayed in "title asc" order, but the RSS feed should default to an item list of "date desc" order.
+   * If the SortOptions are null, incomplete or invalid, the pagination sortOptions will be used instead.
+   */
+  get rssSortOptions() {
+    if (this.showRSS !== false && this.showRSS instanceof SortOptions
+      && this.showRSS.direction !== null
+      && this.showRSS.field !== null) {
+      return this.showRSS;
+    }
+    return this.sortOptions;
+  }
+
 }