feat(LocalMusic): 优化播放列表管理功能

entry/src/main/ets/view/LocalMusic.ets

@@ -452,6 +452,7 @@ export struct LocalMusic {
   private pageCache: Map<number, VideoItem[]> = new Map()  // 页面缓存(最多保留3页)
   private prefetchingPages: Set<number> = new Set()
   private playQueueScope: 'view' | 'history' | 'fav' | 'playlist' | 'single' = 'view'
+  private isHydratingPlayList: boolean = false
   @StorageProp('isLandscape') @Watch('onIsLandscapeChange')  isLandscape: boolean = false;
   @StorageProp('topSafeHeight') topSafeHeight: number = 0;
   @StorageProp('bottomSafeHeight') bottomSafeHeight: number = 0;
@@ -1704,6 +1705,7 @@ export struct LocalMusic {
       //穿山甲
       // this.loadBannerAd(CSJUtil.getBannerID())
 
+      this.restoreLastPlayContext();
       this.songList = PreferencesUtil.getSync('LastMusicList', []) as Array<VideoItem>
       this.currentSong = PreferencesUtil.getSync('LastMusicInfo', undefined) as VideoItem
       if (ArrayUtil.isEmpty(this.songList)) {
@@ -2045,6 +2047,77 @@ export struct LocalMusic {
     }
   }
 
+  private getPlayListDisplayCount(): number {
+    if (this.playQueueScope === 'history') {
+      return this.historyList.length;
+    }
+    if (this.playQueueScope === 'fav') {
+      return this.favList.length;
+    }
+    if (this.playQueueScope === 'playlist') {
+      return this.currentSongList.length;
+    }
+    if (this.playQueueScope === 'view' && this.modeType === 1 && this.totalCount > 0) {
+      return this.totalCount;
+    }
+    return this.songList.length;
+  }
+
+  private restoreLastPlayContext(): void {
+    const scope = PreferencesUtil.getStringSync('LastPlayQueueScope', 'view') as string;
+    if (scope === 'history' || scope === 'fav' || scope === 'playlist' || scope === 'single') {
+      this.playQueueScope = scope;
+    } else {
+      this.playQueueScope = 'view';
+    }
+    const lastModeType = PreferencesUtil.getNumberSync('LastPlayModeType', this.modeType);
+    const lastTotalCount = PreferencesUtil.getNumberSync('LastPlayTotalCount', 0);
+    if (lastModeType === 1 && this.totalCount === 0 && lastTotalCount > 0) {
+      this.totalCount = lastTotalCount;
+    }
+  }
+
+  private async hydrateFullMediaPlayListIfNeeded(): Promise<void> {
+    if (this.isHydratingPlayList) {
+      return;
+    }
+    if (this.playQueueScope !== 'view' || this.modeType !== 1) {
+      return;
+    }
+    if (this.totalCount === 0 || this.songList.length >= this.totalCount) {
+      return;
+    }
+    this.isHydratingPlayList = true;
+    try {
+      const fullList: VideoItem[] = [];
+      let pageIndex = 0;
+      let hasMore = true;
+      while (hasMore) {
+        const result = await this.table.queryMediaLibraryPaged({
+          pageIndex,
+          pageSize: this.pageSize,
+          sortType: this.sortType,
+          searchKeyword: this.isSearchMode ? this.searchText : undefined
+        });
+        if (result.items.length === 0) {
+          break;
+        }
+        fullList.push(...result.items);
+        hasMore = result.hasMore;
+        pageIndex += 1;
+        if (fullList.length >= result.totalCount) {
+          hasMore = false;
+        }
+      }
+      if (fullList.length > 0) {
+        this.songList = fullList;
+        this.sonDataSource.pushArrayData(this.songList);
+      }
+    } finally {
+      this.isHydratingPlayList = false;
+    }
+  }
+
 
   @Builder
   SortMenuBuilder() {
@@ -2792,7 +2865,7 @@ export struct LocalMusic {
             backgroundColor: this.isPlayListBgGrass ? Color.Transparent : $r('app.color.silvery'),
             title: {
               title: Utility.resourceToString(this.context, $r('app.string.current_play_list'))
-                + `(${this.songList.length}首)`
+                + `(${this.getPlayListDisplayCount()}首)`
             }
           })
       }
@@ -6784,6 +6857,7 @@ export struct LocalMusic {
       LogUtil.info('onecold scrollToIndex = ' + this.curIndex)
 
       this.scrollIndex()
+      void this.hydrateFullMediaPlayListIfNeeded();
 
     } else {
       ToastUtil.showToast('当前播放列表为空，请先导入音乐。')
@@ -8891,6 +8965,9 @@ export struct LocalMusic {
     }
     .width('100%')
     .height('100%')
+    .onReachEnd(() => {
+      void this.tryLoadNextPageForPlayback();
+    })
     // .transition(TransitionEffect.move(TransitionEdge.BOTTOM)
     //   .animation({ duration: 500, curve: Curve.Ease }))
     .cachedCount(10)
@@ -10551,7 +10628,7 @@ export struct LocalMusic {
             backgroundColor: this.isPlayListBgGrass?Color.Transparent:$r('app.color.silvery'),
             title: {
               title: Utility.resourceToString(this.context, $r('app.string.current_play_list'))
-                + `(${this.songList.length}首)`
+                + `(${this.getPlayListDisplayCount()}首)`
             }
           })
       }
@@ -10567,6 +10644,7 @@ export struct LocalMusic {
           this.isFrontWhite = false
         }
         this.scrollIndex()
+        void this.hydrateFullMediaPlayListIfNeeded();
       })
 
     }
@@ -10698,7 +10776,7 @@ export struct LocalMusic {
             backgroundColor: this.isPlayListBgGrass ? Color.Transparent : $r('app.color.silvery'),
             title: {
               title: Utility.resourceToString(this.context, $r('app.string.current_play_list'))
-                + `(${this.songList.length}首)`
+                + `(${this.getPlayListDisplayCount()}首)`
             }
           })
       }
@@ -10718,6 +10796,7 @@ export struct LocalMusic {
           this.isFrontWhite = false
         }
         this.scrollIndex()
+        void this.hydrateFullMediaPlayListIfNeeded();
       })
 
     }
@@ -13808,6 +13887,9 @@ export struct LocalMusic {
   saveLastPlayList() {
     PreferencesUtil.putSync('LastMusicInfo', this.currentSong)
     PreferencesUtil.putSync('LastMusicList', this.songList)
+    PreferencesUtil.putSync('LastPlayQueueScope', this.playQueueScope)
+    PreferencesUtil.putSync('LastPlayModeType', this.modeType)
+    PreferencesUtil.putSync('LastPlayTotalCount', this.totalCount)
 
   }