| <template> | 
|     <view class="u-collapse"> | 
|         <u-line v-if="border"></u-line> | 
|         <slot /> | 
|     </view> | 
| </template> | 
|   | 
| <script> | 
|     import props from './props.js'; | 
|     /** | 
|      * collapse 折叠面板  | 
|      * @description 通过折叠面板收纳内容区域 | 
|      * @tutorial https://www.uviewui.com/components/collapse.html | 
|      * @property {String | Number | Array}    value        当前展开面板的name,非手风琴模式:[<string | number>],手风琴模式:string | number | 
|      * @property {Boolean}                    accordion    是否手风琴模式( 默认 false ) | 
|      * @property {Boolean}                    border        是否显示外边框 ( 默认 true ) | 
|      * @event {Function}    change         当前激活面板展开时触发(如果是手风琴模式,参数activeNames类型为String,否则为Array) | 
|      * @example <u-collapse></u-collapse> | 
|      */ | 
|     export default { | 
|         name: "u-collapse", | 
|         mixins: [uni.$u.mpMixin, uni.$u.mixin,props], | 
|         watch: { | 
|             needInit() { | 
|                 this.init() | 
|             } | 
|         }, | 
|         created() { | 
|             this.children = [] | 
|         }, | 
|         computed: { | 
|             needInit() { | 
|                 // 通过computed,同时监听accordion和value值的变化 | 
|                 // 再通过watch去执行init()方法,进行再一次的初始化 | 
|                 return [this.accordion, this.value] | 
|             } | 
|         }, | 
|         watch: { | 
|             // 当父组件需要子组件需要共享的参数发生了变化,手动通知子组件 | 
|             parentData() { | 
|                 if (this.children.length) { | 
|                     this.children.map(child => { | 
|                         // 判断子组件(u-checkbox)如果有updateParentData方法的话,就就执行(执行的结果是子组件重新从父组件拉取了最新的值) | 
|                         typeof(child.updateParentData) === 'function' && child.updateParentData() | 
|                     }) | 
|                 } | 
|             }, | 
|         }, | 
|         methods: { | 
|             // 重新初始化一次内部的所有子元素 | 
|             init() { | 
|                 this.children.map(child => { | 
|                     child.init() | 
|                 }) | 
|             }, | 
|             /** | 
|              * collapse-item被点击时触发,由collapse统一处理各子组件的状态 | 
|              * @param {Object} target 被操作的面板的实例 | 
|              */ | 
|             onChange(target) { | 
|                 let changeArr = [] | 
|                 this.children.map((child, index) => { | 
|                     // 如果是手风琴模式,将其他的折叠面板收起来 | 
|                     if (this.accordion) { | 
|                         child.expanded = child === target ? !target.expanded : false | 
|                         child.setContentAnimate() | 
|                     } else { | 
|                         if(child === target) { | 
|                             child.expanded = !child.expanded | 
|                             child.setContentAnimate() | 
|                         } | 
|                     } | 
|                     // 拼接change事件中,数组元素的状态 | 
|                     changeArr.push({ | 
|                         // 如果没有定义name属性,则默认返回组件的index索引 | 
|                         name: child.name || index, | 
|                         status: child.expanded ? 'open' : 'close' | 
|                     }) | 
|                 }) | 
|   | 
|                 this.$emit('change', changeArr) | 
|                 this.$emit(target.expanded ? 'open' : 'close', target.name) | 
|             } | 
|         } | 
|     } | 
| </script> | 
|   | 
| <style lang="scss" scoped> | 
|     @import "../../libs/css/components.scss"; | 
| </style> |