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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 HashMap from '@ohos.util.HashMap';
17import emitter from '@ohos.events.emitter';
18import { EmptyPage, logger } from '@ohos/common';
19import { KeyValueItemView } from '../components/KeyValueItemView';
20import { KeyValuePair } from '../model/KeyValuePair';
21import { HashMapDataSource } from '../components/hashmapcomponents/HashMapDataSource';
22import { Constant } from '../Constant';
23
24const TAG = 'HashMapView';
25
26@Component
27export struct HashMapView {
28  @State totalCount: number = 0;
29  private hashMap: HashMap<string, string> = new HashMap();
30  private dataSource: HashMapDataSource = new HashMapDataSource();
31
32  aboutToAppear() {
33    emitter.on({ eventId: Constant.EMITTER_ID_HASH_MAP }, (eventData) => {
34      let item: KeyValuePair = eventData.data as KeyValuePair;
35      this.dataSource.addData(item);
36      this.totalCount = this.dataSource.totalCount();
37      this.hashMap.set(item.key, item.value);
38    });
39  }
40
41  aboutToDisappear() {
42    emitter.off(Constant.EMITTER_ID_HASH_MAP);
43  }
44
45  build() {
46    Column() {
47      if (this.totalCount != 0) {
48        List({ space: 12 }) {
49          LazyForEach(this.dataSource, (item: KeyValuePair, index: number) => {
50            ListItem() {
51              KeyValueItemView({
52                index: index,
53                keyValuePair: item,
54                deleteAction: () => {
55                  logger.info(TAG, `item = ${JSON.stringify(item)}`)
56                  this.dataSource.deleteData(item, index);
57                  this.totalCount = this.dataSource.totalCount();
58                  this.hashMap.remove(item.key);
59                }
60              })
61            }
62            .height(72)
63            .width('100%')
64          }, (item: KeyValuePair, index: number) => JSON.stringify(item) + index)
65        }
66        .width('100%')
67        .height('100%')
68        .padding({ top: 8, left: 12, right: 12 })
69      } else {
70        EmptyPage()
71      }
72    }
73    .backgroundColor($r('sys.color.ohos_id_color_sub_background'))
74  }
75}