pco/app/uni_modules/uni-collapse/components/uni-collapse-item/uni-collapse-item.vue

<template>
  <view class="uni-collapse-item">
    <!-- onClick(!isOpen) -->
    <view @click="onClick(!isOpen)" class="uni-collapse-item__title"
          :class="{'is-open':isOpen &&titleBorder === 'auto' ,'uni-collapse-item-border':titleBorder !== 'none'}">
      <view class="uni-collapse-item__title-wrap">
        <slot name="title">
          <view class="uni-collapse-item__title-box" :class="{'is-disabled':disabled}">
            <image v-if="thumb" :src="thumb" class="uni-collapse-item__title-img"/>
            <text class="uni-collapse-item__title-text">{{ title }}</text>
          </view>
        </slot>
      </view>
      <view
          v-if="showArrow"
          :class="{ 'uni-collapse-item__title-arrow-active': isOpen, 'uni-collapse-item--animation': showAnimation === true }"
          class="uni-collapse-item__title-arrow">
        <uni-icons :color="disabled?'#ddd':'#bbb'" size="14" type="bottom"/>
      </view>
    </view>
    <view class="uni-collapse-item__wrap" :class="{'is--transition':showAnimation}"
          :style="{height: (isOpen?height:0) +'px'}">
      <view :id="elId" ref="collapse--hook" class="uni-collapse-item__wrap-content"
            :class="{open:isheight,'uni-collapse-item--border':border&&isOpen}">
        <slot></slot>
      </view>
    </view>

  </view>
</template>

<script>
// #ifdef APP-NVUE
const dom = weex.requireModule('dom')
// #endif
/**
 * CollapseItem 折叠面板子组件
 * @description 折叠面板子组件
 * @property {String} title 标题文字
 * @property {String} thumb 标题左侧缩略图
 * @property {String} name 唯一标志符
 * @property {Boolean} open = [true|false] 是否展开组件
 * @property {Boolean} titleBorder = [true|false] 是否显示标题分隔线
 * @property {Boolean} border = [true|false] 是否显示分隔线
 * @property {Boolean} disabled = [true|false] 是否展开面板
 * @property {Boolean} showAnimation = [true|false] 开启动画
 * @property {Boolean} showArrow = [true|false] 是否显示右侧箭头
 */
export default {
  name: 'uniCollapseItem',
  props: {
    // 列表标题
    title: {
      type: String,
      default: ''
    },
    name: {
      type: [Number, String],
      default: ''
    },
    // 是否禁用
    disabled: {
      type: Boolean,
      default: false
    },
    // #ifdef APP-PLUS
    // 是否显示动画,app 端默认不开启动画，卡顿严重
    showAnimation: {
      type: Boolean,
      default: false
    },
    // #endif
    // #ifndef APP-PLUS
    // 是否显示动画
    showAnimation: {
      type: Boolean,
      default: true
    },
    // #endif
    // 是否展开
    open: {
      type: Boolean,
      default: false
    },
    // 缩略图
    thumb: {
      type: String,
      default: ''
    },
    // 标题分隔线显示类型
    titleBorder: {
      type: String,
      default: 'auto'
    },
    border: {
      type: Boolean,
      default: true
    },
    showArrow: {
      type: Boolean,
      default: true
    }
  },
  data() {
    // TODO 随机生生元素ID，解决百度小程序获取同一个元素位置信息的bug
    const elId = `Uni_${Math.ceil(Math.random() * 10e5).toString(36)}`
    return {
      isOpen: false,
      isheight: null,
      height: 0,
      elId,
      nameSync: 0
    }
  },
  watch: {
    open(val) {
      this.isOpen = val
      this.onClick(val, 'init')
    }
  },
  updated(e) {
    this.$nextTick(() => {
      this.init(true)
    })
  },
  created() {
    this.collapse = this.getCollapse()
    this.oldHeight = 0
  },
  // #ifndef VUE3
  // TODO vue2
  destroyed() {
    if (this.__isUnmounted) return
    this.uninstall()
  },
  // #endif
  // #ifdef VUE3
  // TODO vue3
  unmounted() {
    this.__isUnmounted = true
    this.uninstall()
  },
  // #endif
  mounted() {
    if (!this.collapse) return
    if (this.name !== '') {
      this.nameSync = this.name
    } else {
      this.nameSync = this.collapse.childrens.length + ''
    }
    if (this.collapse.names.indexOf(this.nameSync) === -1) {
      this.collapse.names.push(this.nameSync)
    } else {
      console.warn(`name 值 ${this.nameSync} 重复`);
    }
    if (this.collapse.childrens.indexOf(this) === -1) {
      this.collapse.childrens.push(this)
    }
    this.init()
  },
  methods: {
    init(type) {
      // #ifndef APP-NVUE
      this.getCollapseHeight(type)
      // #endif
      // #ifdef APP-NVUE
      this.getNvueHwight(type)
      // #endif
    },
    uninstall() {
      if (this.collapse) {
        this.collapse.childrens.forEach((item, index) => {
          if (item === this) {
            this.collapse.childrens.splice(index, 1)
          }
        })
        this.collapse.names.forEach((item, index) => {
          if (item === this.nameSync) {
            this.collapse.names.splice(index, 1)
          }
        })
      }
    },
    onClick(isOpen, type) {
      if (this.disabled) return
      this.isOpen = isOpen
      if (this.isOpen && this.collapse) {
        this.collapse.setAccordion(this)
      }
      if (type !== 'init') {
        this.collapse.onChange(isOpen, this)
      }
    },
    getCollapseHeight(type, index = 0) {
      const views = uni.createSelectorQuery().in(this)
      views
          .select(`#${this.elId}`)
          .fields({
            size: true
          }, data => {
            // TODO 百度中可能获取不到节点信息 ，需要循环获取
            if (index >= 10) return
            if (!data) {
              index++
              this.getCollapseHeight(false, index)
              return
            }
            // #ifdef APP-NVUE
            this.height = data.height + 1
            // #endif
            // #ifndef APP-NVUE
            this.height = data.height
            // #endif
            this.isheight = true
            if (type) return
            this.onClick(this.open, 'init')
          })
          .exec()
    },
    getNvueHwight(type) {
      const result = dom.getComponentRect(this.$refs['collapse--hook'], option => {
        if (option && option.result && option.size) {
          // #ifdef APP-NVUE
          this.height = option.size.height + 1
          // #endif
          // #ifndef APP-NVUE
          this.height = option.size.height
          // #endif
          this.isheight = true
          if (type) return
          this.onClick(this.open, 'init')
        }
      })
    },
    /**
     * 获取父元素实例
     */
    getCollapse(name = 'uniCollapse') {
      let parent = this.$parent;
      let parentName = parent.$options.name;
      while (parentName !== name) {
        parent = parent.$parent;
        if (!parent) return false;
        parentName = parent.$options.name;
      }
      return parent;
    }
  }
}
</script>

<style lang="scss">
.uni-collapse-item {
  /* #ifndef APP-NVUE */
  box-sizing: border-box;

  /* #endif */
  &__title {
    /* #ifndef APP-NVUE */
    display: flex;
    width: 100%;
    box-sizing: border-box;
    /* #endif */
    flex-direction: row;
    align-items: center;
    transition: border-bottom-color .3s;

    // transition-property: border-bottom-color;
    // transition-duration: 5s;
    &-wrap {
      width: 100%;
      flex: 1;

    }

    &-box {
      padding: 0 15px;
      /* #ifndef APP-NVUE */
      display: flex;
      width: 100%;
      box-sizing: border-box;
      /* #endif */
      flex-direction: row;
      justify-content: space-between;
      align-items: center;
      height: 48px;
      line-height: 48px;
      background-color: #fff;
      color: #303133;
      font-size: 13px;
      font-weight: 500;
      /* #ifdef H5 */
      cursor: pointer;
      outline: none;

      /* #endif */
      &.is-disabled {
        .uni-collapse-item__title-text {
          color: #999;
        }
      }

    }

    &.uni-collapse-item-border {
      border-bottom: 1px solid #ebeef5;
    }

    &.is-open {
      border-bottom-color: transparent;
    }

    &-img {
      height: 22px;
      width: 22px;
      margin-right: 10px;
    }

    &-text {
      flex: 1;
      font-size: 14px;
      /* #ifndef APP-NVUE */
      white-space: nowrap;
      color: inherit;
      /* #endif */
      /* #ifdef APP-NVUE */
      lines: 1;
      /* #endif */
      overflow: hidden;
      text-overflow: ellipsis;
    }

    &-arrow {
      /* #ifndef APP-NVUE */
      display: flex;
      box-sizing: border-box;
      /* #endif */
      align-items: center;
      justify-content: center;
      width: 20px;
      height: 20px;
      margin-right: 10px;
      transform: rotate(0deg);

      &-active {
        transform: rotate(-180deg);
      }
    }


  }

  &__wrap {
    /* #ifndef APP-NVUE */
    will-change: height;
    box-sizing: border-box;
    /* #endif */
    background-color: #fff;
    overflow: hidden;
    position: relative;
    height: 0;

    &.is--transition {
      // transition: all 0.3s;
      transition-property: height, border-bottom-width;
      transition-duration: 0.3s;
      /* #ifndef APP-NVUE */
      will-change: height;
      /* #endif */
    }


    &-content {
      position: absolute;
      font-size: 13px;
      color: #303133;
      // transition: height 0.3s;
      border-bottom-color: transparent;
      border-bottom-style: solid;
      border-bottom-width: 0;

      &.uni-collapse-item--border {
        border-bottom-width: 1px;
        border-bottom-color: red;
        border-bottom-color: #ebeef5;
      }

      &.open {
        position: relative;
      }
    }
  }

  &--animation {
    transition-property: transform;
    transition-duration: 0.3s;
    transition-timing-function: ease;
  }

}
</style>