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1/*
2 * Copyright (c) 2025 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
16@Entry
17@ComponentV2
18struct MyComponent {
19  @Local arr: Array<string> = [];
20  scroller: Scroller = new Scroller();
21  build() {
22    Column({ space: 5 }) {
23      List({ scroller: this.scroller, space: 5, initialIndex: 100 }) {
24        Repeat(this.arr)
25          .virtualScroll({
26            onTotalCount: () => { return 1000; },
27            onLazyLoading: (index: number) => { this.arr[index] = index.toString(); }
28          })
29          .each((obj: RepeatItem<string>) => {
30            ListItem() {
31              Row({ space: 5 }) {
32                Text(`${obj.index}: Item_${obj.item}`)
33              }
34            }
35            .height(50)
36          })
37      }
38      .height('80%')
39      .border({ width: 1})
40      Button('ScrollToIndex 500')
41        .onClick(() => { this.scroller.scrollToIndex(500); })
42    }
43  }
44}