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<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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