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1/*
2* Copyright (c) 2023 Hunan OpenValley Digital Industry Development 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
16import HashSet from '@ohos.util.HashSet';
17import emitter from '@ohos.events.emitter';
18import { EmptyPage } from '@ohos/common/src/main/ets/components/EmptyPage';
19import { logger } from '@ohos/common/src/main/ets/util/Logger';
20import { ValueItemView } from '../components/ValueItemView';
21import { HashSetDataSource } from '../components/hashsetcomponents/HashSetDataSource';
22import { Constant } from '../Constant';
23
24const TAG = 'HashSetView'
25
26@Component
27export struct HashSetView {
28  @State totalCount: number = 0;
29  private hashSet: HashSet<string> = new HashSet();
30  private dataSource: HashSetDataSource = new HashSetDataSource();
31
32  aboutToAppear() {
33    emitter.on({ eventId: Constant.EMITTER_ID_HASH_SET }, (eventData: emitter.EventData) => {
34      if (eventData.data === undefined) {
35        return;
36      }
37      let item: string = eventData.data.value;
38      this.dataSource.addData(item);
39      this.totalCount = this.dataSource.totalCount();
40      this.hashSet.add(item);
41    });
42  }
43
44  aboutToDisappear() {
45    emitter.off(Constant.EMITTER_ID_HASH_SET);
46  }
47
48  build() {
49    Column() {
50      if (this.totalCount != 0) {
51        List({ space: 12 }) {
52          LazyForEach(this.dataSource, (item: string, index: number) => {
53            ListItem() {
54              ValueItemView({
55                index: index,
56                value: item,
57                deleteAction: () => {
58                  logger.info(TAG, `item = ${JSON.stringify(item)}`)
59                  this.dataSource.deleteData(item, index);
60                  this.totalCount = this.dataSource.totalCount();
61                  this.hashSet.remove(item);
62                }
63              })
64            }
65            .height(72)
66            .width('100%')
67          }, (item: string, index: number) => JSON.stringify(item) + index)
68        }
69        .width('100%')
70        .height('100%')
71        .padding({ top: 8, left: 12, right: 12 })
72      } else {
73        EmptyPage()
74      }
75    }
76    .backgroundColor($r('sys.color.ohos_id_color_sub_background'))
77  }
78}