118219: Store result of drag & dropping bitstream

src/app/item-page/edit-item-page/item-bitstreams/item-bitstreams.component.ts

@@ -1,6 +1,6 @@
 import { ChangeDetectorRef, Component, NgZone, OnDestroy } from '@angular/core';
 import { AbstractItemUpdateComponent } from '../abstract-item-update/abstract-item-update.component';
-import { filter, map, switchMap, take } from 'rxjs/operators';
+import { map, switchMap, take } from 'rxjs/operators';
 import { Observable, Subscription, zip as observableZip } from 'rxjs';
 import { ItemDataService } from '../../../core/data/item-data.service';
 import { ObjectUpdatesService } from '../../../core/data/object-updates/object-updates.service';
@@ -11,7 +11,11 @@ import { BitstreamDataService } from '../../../core/data/bitstream-data.service'
 import { hasValue } from '../../../shared/empty.util';
 import { ObjectCacheService } from '../../../core/cache/object-cache.service';
 import { RequestService } from '../../../core/data/request.service';
-import { getFirstSucceededRemoteData, getRemoteDataPayload } from '../../../core/shared/operators';
+import {
+  getFirstSucceededRemoteData,
+  getRemoteDataPayload,
+  getFirstCompletedRemoteData
+} from '../../../core/shared/operators';
 import { RemoteData } from '../../../core/data/remote-data';
 import { PaginatedList } from '../../../core/data/paginated-list.model';
 import { Bundle } from '../../../core/shared/bundle.model';
@@ -127,12 +131,13 @@ export class ItemBitstreamsComponent extends AbstractItemUpdateComponent impleme
           from: `/_links/bitstreams/${event.fromIndex}/href`,
           path: `/_links/bitstreams/${event.toIndex}/href`
         } as Operation;
-        this.bundleService.patch(bundle, [moveOperation]).pipe(take(1)).subscribe((response: RemoteData<Bundle>) => {
+        this.bundleService.patch(bundle, [moveOperation]).pipe(
+          getFirstCompletedRemoteData(),
+        ).subscribe((response: RemoteData<Bundle>) => {
           this.zone.run(() => {
             this.itemBitstreamsService.displayNotifications('item.edit.bitstreams.notifications.move', [response]);
             // Remove all cached requests from this bundle and call the event's callback when the requests are cleared
-            this.requestService.removeByHrefSubstring(bundle.self).pipe(
-              filter((isCached) => isCached),
+            this.requestService.setStaleByHrefSubstring(bundle.self).pipe(
               take(1)
             ).subscribe(() => event.finish());
           });

src/app/item-page/edit-item-page/item-bitstreams/item-edit-bitstream-bundle/item-edit-bitstream-bundle.component.ts

@@ -28,7 +28,8 @@ import { PaginationService } from '../../../../core/pagination/pagination.servic
 import { PaginationComponent } from '../../../../shared/pagination/pagination.component';
 import { RequestService } from '../../../../core/data/request.service';
 import { ItemBitstreamsService } from '../item-bitstreams.service';
-import { CdkDragDrop } from '@angular/cdk/drag-drop';
+import { CdkDragDrop, moveItemInArray } from '@angular/cdk/drag-drop';
+import { hasValue } from '../../../../shared/empty.util';
 
 /**
  * Interface storing all the information necessary to create a row in the bitstream edit table
@@ -135,7 +136,7 @@ export class ItemEditBitstreamBundleComponent implements OnInit {
   /**
    * The data to show in the table
    */
-  tableEntries$: Observable<BitstreamTableEntry[]>;
+  tableEntries$: BehaviorSubject<BitstreamTableEntry[]> = new BehaviorSubject(null);
 
   /**
    * The initial page options to use for fetching the bitstreams
@@ -165,7 +166,7 @@ export class ItemEditBitstreamBundleComponent implements OnInit {
   /**
    * The updates to the current bitstreams
    */
-  updates$: Observable<FieldUpdates>;
+  updates$: BehaviorSubject<FieldUpdates> = new BehaviorSubject(null);
 
 
   constructor(
@@ -229,17 +230,17 @@ export class ItemEditBitstreamBundleComponent implements OnInit {
       this.objectUpdatesService.initialize(this.bundleUrl, bitstreams, new Date());
     });
 
-    this.updates$ = this.bitstreamsRD$.pipe(
+    this.bitstreamsRD$.pipe(
       getAllSucceededRemoteData(),
       paginatedListToArray(),
       switchMap((bitstreams) => this.objectUpdatesService.getFieldUpdatesExclusive(this.bundleUrl, bitstreams))
-    );
+    ).subscribe((updates) => this.updates$.next(updates));
 
-    this.tableEntries$ = this.bitstreamsRD$.pipe(
+    this.bitstreamsRD$.pipe(
       getAllSucceededRemoteData(),
       paginatedListToArray(),
       map((bitstreams) => this.itemBitstreamsService.mapBitstreamsToTableEntries(bitstreams)),
-    );
+    ).subscribe((tableEntries) => this.tableEntries$.next(tableEntries));
   }
 
   /**
@@ -288,7 +289,50 @@ export class ItemEditBitstreamBundleComponent implements OnInit {
   }
 
   drop(event: CdkDragDrop<any>) {
-    console.log('dropEvent:', event);
+    const dragIndex = event.previousIndex;
+    let dropIndex = event.currentIndex;
+    const dragPage = this.currentPaginationOptions$.value.currentPage - 1;
+    let dropPage = this.currentPaginationOptions$.value.currentPage - 1;
+
+    // Check if the user is hovering over any of the pagination's pages at the time of dropping the object
+    const droppedOnElement = document.elementFromPoint(event.dropPoint.x, event.dropPoint.y);
+    if (hasValue(droppedOnElement) && hasValue(droppedOnElement.textContent) && droppedOnElement.classList.contains('page-link')) {
+      // The user is hovering over a page, fetch the page's number from the element
+      const droppedPage = Number(droppedOnElement.textContent);
+      if (hasValue(droppedPage) && !Number.isNaN(droppedPage)) {
+        dropPage = droppedPage - 1;
+        dropIndex = 0;
+      }
+    }
+
+    const isNewPage = dragPage !== dropPage;
+    // Move the object in the custom order array if the drop happened within the same page
+    // This allows us to instantly display a change in the order, instead of waiting for the REST API's response first
+    if (!isNewPage && dragIndex !== dropIndex) {
+      const currentEntries = [...this.tableEntries$.value];
+      moveItemInArray(currentEntries, dragIndex, dropIndex);
+      this.tableEntries$.next(currentEntries);
+    }
+
+    const pageSize = this.currentPaginationOptions$.value.pageSize;
+    const redirectPage = dropPage + 1;
+    const fromIndex = (dragPage * pageSize) + dragIndex;
+    const toIndex = (dropPage * pageSize) + dropIndex;
+    // Send out a drop event (and navigate to the new page) when the "from" and "to" indexes are different from each other
+    if (fromIndex !== toIndex) {
+      // if (isNewPage) {
+      //   this.loading$.next(true);
+      // }
+      this.dropObject.emit(Object.assign({
+        fromIndex,
+        toIndex,
+        finish: () => {
+          if (isNewPage) {
+            this.paginationComponent.doPageChange(redirectPage);
+          }
+        }
+      }));
+    }
   }
 
 }