13af6ab5fSopenharmony_ci/* 23af6ab5fSopenharmony_ci * Copyright (c) 2024 Huawei Device Co., Ltd. 33af6ab5fSopenharmony_ci * Licensed under the Apache License, Version 2.0 (the "License"); 43af6ab5fSopenharmony_ci * you may not use this file except in compliance with the License. 53af6ab5fSopenharmony_ci * You may obtain a copy of the License at 63af6ab5fSopenharmony_ci * 73af6ab5fSopenharmony_ci * http://www.apache.org/licenses/LICENSE-2.0 83af6ab5fSopenharmony_ci * 93af6ab5fSopenharmony_ci * Unless required by applicable law or agreed to in writing, software 103af6ab5fSopenharmony_ci * distributed under the License is distributed on an "AS IS" BASIS, 113af6ab5fSopenharmony_ci * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 123af6ab5fSopenharmony_ci * See the License for the specific language governing permissions and 133af6ab5fSopenharmony_ci * limitations under the License. 143af6ab5fSopenharmony_ci */ 153af6ab5fSopenharmony_ci 163af6ab5fSopenharmony_ci 173af6ab5fSopenharmony_ciclass MyDataSource { 183af6ab5fSopenharmony_ci data: string[] = ["a", "b", "c", "d", "e"]; 193af6ab5fSopenharmony_ci public totalCount(): number { 203af6ab5fSopenharmony_ci return this.data.length; 213af6ab5fSopenharmony_ci } 223af6ab5fSopenharmony_ci public getData(index: number): string { 233af6ab5fSopenharmony_ci return this.data[index]; 243af6ab5fSopenharmony_ci } 253af6ab5fSopenharmony_ci} 263af6ab5fSopenharmony_ci 273af6ab5fSopenharmony_ci// A simplified version of ArkUI `LazyForEach` in SDK 283af6ab5fSopenharmony_ciclass LazyForEach { 293af6ab5fSopenharmony_ci create(id: string, component: any, source: any, itemGenFunction: any, itemIdFunc: any): void {}; 303af6ab5fSopenharmony_ci} 313af6ab5fSopenharmony_ci 323af6ab5fSopenharmony_cilet lazyforeach: LazyForEach = new LazyForEach(); 333af6ab5fSopenharmony_ci 343af6ab5fSopenharmony_ciclass MyComponent { 353af6ab5fSopenharmony_ci constructor(params, __localStorage) { 363af6ab5fSopenharmony_ci this.source = new MyDataSource(); 373af6ab5fSopenharmony_ci this.setInitiallyProvidedValue(params); 383af6ab5fSopenharmony_ci } 393af6ab5fSopenharmony_ci setInitiallyProvidedValue(params) { 403af6ab5fSopenharmony_ci if (params.source !== undefined) { 413af6ab5fSopenharmony_ci this.source = params.source; 423af6ab5fSopenharmony_ci } 433af6ab5fSopenharmony_ci } 443af6ab5fSopenharmony_ci observeComponentCreation2() {}; 453af6ab5fSopenharmony_ci private source: MyDataSource; 463af6ab5fSopenharmony_ci initialRender() { 473af6ab5fSopenharmony_ci this.observeComponentCreation2(); 483af6ab5fSopenharmony_ci { 493af6ab5fSopenharmony_ci const __lazyForEachItemGenFunction = (_item, index?: number) => { 503af6ab5fSopenharmony_ci const item = _item; 513af6ab5fSopenharmony_ci { 523af6ab5fSopenharmony_ci const observedDeepRender = () => { 533af6ab5fSopenharmony_ci }; 543af6ab5fSopenharmony_ci observedDeepRender(); 553af6ab5fSopenharmony_ci } 563af6ab5fSopenharmony_ci }; 573af6ab5fSopenharmony_ci const __lazyForEachItemIdFunc = (item: string, index?: number) => index?.toString() + item; 583af6ab5fSopenharmony_ci lazyforeach.create("1", this, this.source, __lazyForEachItemGenFunction, __lazyForEachItemIdFunc); 593af6ab5fSopenharmony_ci } 603af6ab5fSopenharmony_ci } 613af6ab5fSopenharmony_ci}