fix scroll position

src/app/modules/songs/services/song-data.service.ts

@@ -11,13 +11,20 @@ export class SongDataService {
   private dbService = inject(DbService);
 
   private collection = 'songs';
-  public list$: Observable<Song[]> = this.dbService.col$<Song>(this.collection).pipe(
+  private loadedList$: Observable<Song[]> = this.dbService.col$<Song>(this.collection).pipe(
+    shareReplay({
+      bufferSize: 1,
+      refCount: false, // keep the listener alive after first subscription to avoid reloading on navigation
+    })
+  );
+  public list$: Observable<Song[]> = this.loadedList$.pipe(
     startWith([] as Song[]), // immediate empty emit keeps UI responsive while first snapshot arrives
     shareReplay({
       bufferSize: 1,
       refCount: false, // keep the listener alive after first subscription to avoid reloading on navigation
     })
   );
+  public listLoaded$ = (): Observable<Song[]> => this.loadedList$;
 
   public read$ = (songId: string): Observable<Song | null> => this.dbService.doc$(this.collection + '/' + songId);
   public update$ = async (songId: string, data: Partial<Song>): Promise<void> => await this.dbService.doc(this.collection + '/' + songId).update(data);

src/app/modules/songs/services/song-list.resolver.ts

@@ -12,6 +12,6 @@ export class SongListResolver {
   private songService = inject(SongService);
 
   public resolve(): Observable<Song[]> {
-    return this.songService.list$().pipe(take(1));
+    return this.songService.listLoaded$().pipe(take(1));
   }
 }

src/app/modules/songs/services/song.service.ts

@@ -26,6 +26,7 @@ export class SongService {
   public static LEGAL_TYPE: SongLegalType[] = ['open', 'allowed'];
 
   public list$ = (): Observable<Song[]> => this.songDataService.list$; //.pipe(tap(_ => (this.list = _)));
+  public listLoaded$ = (): Observable<Song[]> => this.songDataService.listLoaded$();
   public read$ = (songId: string): Observable<Song | null> => this.songDataService.read$(songId);
   public read = (songId: string): Promise<Song | null> => firstValueFrom(this.read$(songId));
 

src/app/modules/songs/song-list/song-list.component.ts

@@ -1,13 +1,11 @@
-import {ChangeDetectionStrategy, Component, OnDestroy, OnInit, inject} from '@angular/core';
-import {SongService} from '../services/song.service';
+import {ChangeDetectionStrategy, Component, inject} from '@angular/core';
 import {Song} from '../services/song';
 import {map} from 'rxjs/operators';
 import {combineLatest, Observable} from 'rxjs';
 import {fade} from '../../../animations';
-import {RouterLink} from '@angular/router';
+import {ActivatedRoute, RouterLink} from '@angular/router';
 import {filterSong} from '../../../services/filter.helper';
 import {FilterValues} from './filter/filter-values';
-import {ScrollService} from '../../../services/scroll.service';
 import {faBalanceScaleRight, faCheck, faPencilRuler} from '@fortawesome/free-solid-svg-icons';
 import {TextRenderingService} from '../services/text-rendering.service';
 import {FilterStoreService} from '../../../services/filter-store.service';
@@ -30,16 +28,15 @@ interface SongListItem extends Song {
   animations: [fade],
   imports: [ListHeaderComponent, FilterComponent, CardComponent, RouterLink, RoleDirective, FaIconComponent, AsyncPipe],
 })
-export class SongListComponent implements OnInit, OnDestroy {
-  private songService = inject(SongService);
-  private scrollService = inject(ScrollService);
+export class SongListComponent {
+  private route = inject(ActivatedRoute);
   private textRenderingService = inject(TextRenderingService);
   private filterStore = inject(FilterStoreService);
 
   public anyFilterActive = false;
   public songs$: Observable<SongListItem[]> = combineLatest([
     this.filterStore.songFilter$,
-    this.songService.list$().pipe(map(songs => [...songs].sort((a, b) => a.number - b.number))),
+    this.route.data.pipe(map(data => (data['songs'] as Song[]).slice().sort((a, b) => a.number - b.number))),
   ]).pipe(
     map(([filter, songs]) => {
       this.anyFilterActive = this.checkIfFilterActive(filter);
@@ -56,15 +53,6 @@ export class SongListComponent implements OnInit, OnDestroy {
   public faDraft = faPencilRuler;
   public faFinal = faCheck;
 
-  public ngOnInit(): void {
-    setTimeout(() => this.scrollService.restoreScrollPositionFor('songlist'), 100);
-    setTimeout(() => this.scrollService.restoreScrollPositionFor('songlist'), 300);
-  }
-
-  public ngOnDestroy(): void {
-    this.scrollService.storeScrollPositionFor('songlist');
-  }
-
   public trackBy = (index: number, show: SongListItem) => show.id;
 
   private filter(song: Song, filter: FilterValues): boolean {

src/app/modules/songs/songs-routing.module.ts

@@ -5,12 +5,16 @@ import {SongListComponent} from './song-list/song-list.component';
 import {EditComponent} from './song/edit/edit.component';
 import {NewComponent} from './song/new/new.component';
 import {EditSongGuard} from './song/edit/edit-song.guard';
+import {SongListResolver} from './services/song-list.resolver';
 
 const routes: Routes = [
   {
     path: '',
     component: SongListComponent,
     pathMatch: 'full',
+    resolve: {
+      songs: SongListResolver,
+    },
   },
   {
     path: 'new',