quanyawei
2023-11-01 66d2c8d8c97e19fdbd969f97dd3d6a28f27c415f
uni_modules/uview-ui/components/u-collapse/u-collapse.vue
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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>