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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 emitter from '@ohos.events.emitter';
17import { EmptyPage } from '@ohos/common/src/main/ets/components/EmptyPage';
18import { Information } from '../model/Information';
19import { StackDataSource } from '../components/stackcomponents/StackDataSource';
20import { InformationItemView } from '../components/InformationItemView';
21import { Constant } from '../Constant';
22
23const MIN_LENGTH = 0;
24
25@Component
26export struct StackView {
27  private dataSource: StackDataSource = new StackDataSource();
28  @State totalCount: number = MIN_LENGTH;
29
30  aboutToAppear() {
31    emitter.on({ eventId: Constant.EMITTER_ID_STACK }, (eventData) => {
32      this.dataSource.addData(eventData.data as Information);
33      this.totalCount = this.dataSource.totalCount();
34    });
35  }
36
37  aboutToDisappear() {
38    emitter.off(Constant.EMITTER_ID_STACK);
39  }
40
41  build() {
42    Column() {
43      if (this.totalCount > MIN_LENGTH) {
44        List() {
45          LazyForEach(this.dataSource, (item: Information, index: number) => {
46            ListItem() {
47              InformationItemView({
48                index: index,
49                information: item,
50                deleteAction: () => {
51                  this.dataSource.deleteData();
52                  this.totalCount = this.dataSource.totalCount();
53                }
54              })
55            }
56            .height(72)
57            .width('100%')
58            .margin({ bottom: 20 })
59          }, (item: Information, index: number) => JSON.stringify(item) + index)
60        }
61        .width('100%')
62        .layoutWeight(1)
63
64      } else {
65        EmptyPage()
66      }
67    }
68    .backgroundColor($r('sys.color.ohos_id_color_sub_background'))
69  }
70}