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<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>