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1/*
2 * Copyright (c) 2022 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 BasicDataSource implements IDataSource {
17  private listeners: DataChangeListener[] = []
18
19  public totalCount(): number {
20    return 0
21  }
22
23  public getData(index: number): any {
24    return undefined
25  }
26
27  registerDataChangeListener(listener: DataChangeListener): void {
28    if (this.listeners.indexOf(listener) < 0) {
29      console.info('add listener')
30      this.listeners.push(listener)
31    }
32  }
33
34  unregisterDataChangeListener(listener: DataChangeListener): void {
35    const pos = this.listeners.indexOf(listener);
36    if (pos >= 0) {
37      console.info('remove listener')
38      this.listeners.splice(pos, 1)
39    }
40  }
41
42  notifyDataReload(): void {
43    this.listeners.forEach(listener => {
44      listener.onDataReloaded()
45    })
46  }
47
48  notifyDataAdd(index: number): void {
49    this.listeners.forEach(listener => {
50      listener.onDataAdd(index)
51    })
52  }
53
54  notifyDataChange(index: number): void {
55    this.listeners.forEach(listener => {
56      listener.onDataChange(index)
57    })
58  }
59
60  notifyDataDelete(index: number): void {
61    this.listeners.forEach(listener => {
62      listener.onDataDelete(index)
63    })
64  }
65
66  notifyDataMove(from: number, to: number): void {
67    this.listeners.forEach(listener => {
68      listener.onDataMove(from, to)
69    })
70  }
71}
72
73export class MyDataSource extends BasicDataSource {
74  private dataArray: any[] = []
75
76  constructor(data: any[]) {
77    super()
78    this.dataArray = data
79  }
80
81  public totalCount(): number {
82    return this.dataArray.length
83  }
84
85  public getData(index: number): any {
86    return this.dataArray[index]
87  }
88
89  public addData(index: number, data: any): void {
90    this.dataArray.splice(index, 0, data)
91    this.notifyDataAdd(index)
92  }
93
94  public pushData(data: any): void {
95    this.dataArray.push(data)
96    this.notifyDataAdd(this.dataArray.length - 1)
97  }
98}