1/* 2 * Copyright (c) 2024 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16class BasicPrefetcher implements IPrefetcher { 17 private readonly prefetcher = new Prefetcher(new PrefetchRangeEvaluator(), new DefaultTimeProvider()); 18 19 constructor(ds?: IDataSourcePrefetching) { 20 if (ds) { 21 this.prefetcher.setDataSource(ds); 22 } 23 } 24 25 setDataSource(ds: IDataSourcePrefetching): void { 26 this.prefetcher.setDataSource(ds); 27 } 28 29 visibleAreaChanged(minVisible: number, maxVisible: number): void { 30 this.prefetcher.visibleAreaChanged(minVisible, maxVisible); 31 } 32} 33