1/* 2 * Copyright (c) 2023 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 16import ArrayList from '@ohos.util.ArrayList'; 17import { Information } from '../../model/Information'; 18 19export class MyDataSource { 20 public dataArray: ArrayList<Information> = new ArrayList(); 21 private listeners: DataChangeListener[] = []; 22 23 constructor(ele: ArrayList<Information>) { 24 for (let index = 0;index < ele.length; index++) { 25 this.dataArray.add(ele[index]); 26 } 27 } 28 29 public totalCount(): number { 30 return this.dataArray.length; 31 } 32 33 public getData(index: number): Information { 34 return this.dataArray[index]; 35 } 36 37 public addData(index: number, data: Information): void { 38 this.dataArray.removeByIndex(index); 39 this.notifyDataAdd(index); 40 } 41 42 registerDataChangeListener(listener: DataChangeListener): void { 43 if (this.listeners.indexOf(listener) < 0) { 44 this.listeners.push(listener); 45 } 46 } 47 48 unregisterDataChangeListener(listener: DataChangeListener): void { 49 const pos = this.listeners.indexOf(listener); 50 if (pos >= 0) { 51 this.listeners.splice(pos, 1); 52 } 53 } 54 55 notifyDataReload(): void { 56 this.listeners.forEach(listener => { 57 listener.onDataReloaded(); 58 }) 59 } 60 61 notifyDataAdd(index: number): void { 62 this.listeners.forEach(listener => { 63 listener.onDataAdd(index); 64 }) 65 } 66 67 notifyDataChange(index: number): void { 68 this.listeners.forEach(listener => { 69 listener.onDataChange(index); 70 }) 71 } 72}