1/* 2 * Copyright (c) 2025 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 16/** 17 * 通过实现AttributeModifier接口，自定义属性修改器 18 * 将拖拽排序相关样式封装成属性修改器，可以方便移植 19 */ 20export class ListItemModifier implements AttributeModifier<ListItemAttribute> { 21 // 阴影 22 public hasShadow: boolean = false; 23 // 缩放 24 public scale: number = 1; 25 // 纵轴偏移量 26 public offsetY: number = 0; 27 // 横轴偏移量 28 public offsetX: number = 0; 29 // 透明度 30 public opacity: number = 1; 31 // 是否被删除 32 public isDeleted: boolean = false; 33 public static instance: ListItemModifier | null = null; 34 35 public static getInstance(): ListItemModifier { 36 if (!ListItemModifier.instance) { 37 ListItemModifier.instance = new ListItemModifier(); 38 } 39 return ListItemModifier.instance; 40 } 41 42 /** 43 * 定义组件普通状态时的样式 44 * @param instance: ListItem属性 45 */ 46 applyNormalAttribute(instance: ListItemAttribute): void { 47 if (this.hasShadow) { 48 instance.shadow({ radius: $r('app.integer.list_exchange_shadow_radius'), color: $r('app.color.list_exchange_box_shadow') }); 49 instance.zIndex(1); 50 instance.opacity(0.5); 51 } else { 52 instance.opacity(this.opacity); 53 } 54 instance.translate({ x: this.offsetX, y: this.offsetY }); 55 instance.scale({ x: this.scale, y: this.scale }); 56 } 57}