91 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
			
		
		
	
	
			91 lines
		
	
	
		
			2.7 KiB
		
	
	
	
		
			Vue
		
	
	
	
<template>
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	<view class="u-collapse">
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		<u-line v-if="border"></u-line>
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		<slot />
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	</view>
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</template>
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<script>
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	import props from './props.js';
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	/**
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	 * collapse 折叠面板 
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	 * @description 通过折叠面板收纳内容区域
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	 * @tutorial https://www.uviewui.com/components/collapse.html
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	 * @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
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	 * @property {Boolean}					accordion	是否手风琴模式( 默认 false )
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	 * @property {Boolean}					border		是否显示外边框 ( 默认 true )
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	 * @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)
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	 * @example <u-collapse></u-collapse>
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	 */
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	export default {
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		name: "u-collapse",
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		mixins: [uni.$u.mpMixin, uni.$u.mixin,props],
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		watch: {
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			needInit() {
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				this.init()
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			}
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		},
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		created() {
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			this.children = []
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		},
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		computed: {
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			needInit() {
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				// 通过computed,同时监听accordion和value值的变化
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				// 再通过watch去执行init()方法,进行再一次的初始化
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				return [this.accordion, this.value]
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			}
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		},
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		watch: {
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			// 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
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			parentData() {
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				if (this.children.length) {
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					this.children.map(child => {
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						// 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)
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						typeof(child.updateParentData) === 'function' && child.updateParentData()
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					})
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				}
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			},
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		},
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		methods: {
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			// 重新初始化一次内部的所有子元素
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			init() {
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				this.children.map(child => {
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					child.init()
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				})
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			},
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			/**
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			 * collapse-item被点击时触发,由collapse统一处理各子组件的状态
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			 * @param {Object} target 被操作的面板的实例
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			 */
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			onChange(target) {
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				let changeArr = []
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				this.children.map((child, index) => {
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					// 如果是手风琴模式,将其他的折叠面板收起来
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					if (this.accordion) {
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						child.expanded = child === target ? !target.expanded : false
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						child.setContentAnimate()
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					} else {
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						if(child === target) {
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							child.expanded = !child.expanded
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							child.setContentAnimate()
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						}
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					}
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					// 拼接change事件中,数组元素的状态
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					changeArr.push({
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						// 如果没有定义name属性,则默认返回组件的index索引
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						name: child.name || index,
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						status: child.expanded ? 'open' : 'close'
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					})
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				})
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				this.$emit('change', changeArr)
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				this.$emit(target.expanded ? 'open' : 'close', target.name)
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			}
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		}
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	}
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</script>
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<style lang="scss" scoped>
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	@import "../../libs/css/components.scss";
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</style>
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