<template>
  <view>
    <view class="cell-box" :style="{ backgroundColor: checked ? checkedBgColor : '#fff' }">
      <view
        class="expand-icon"
        v-if="hasChildren"
        @click.stop="toggleExpand"
      >
        <view :class="['triangle', expanded ? 'down' : 'right']"></view>
      </view>
      <view class="label">{{ node[labelKey] }}</view>
      <checkbox-group v-if="multiple" @change="onCheck">
        <checkbox
          :value="String(node[idKey])"
          :checked="checked"
          style="margin-left: 10rpx;"
        />
      </checkbox-group>
      <radio-group v-else @change="onRadio">
        <radio
            :value="String(node[idKey])"
            :checked="checked"
            style="margin-left: 10rpx;"
        />
        </radio-group>
    </view>
    <view v-if="hasChildren && expanded" style="padding-left: 30rpx;">
      <tree-node
        v-for="child in node[childrenKey]"
        :key="child[idKey]"
        :node="child"
        :children-key="childrenKey"
        :label-key="labelKey"
        :id-key="idKey"
        :checked-bg-color="checkedBgColor"
        :multiple="multiple"
        :checked-ids="checkedIds"
        @check-change="$emit('check-change', $event)"
      />
    </view>
  </view>
</template>

<script>
import TreeNode from './TreeNode.vue'
export default {
  name: 'TreeNode',
  components: { TreeNode },
  props: {
    node: { type: Object, required: true },
    childrenKey: { type: String, required: true },
    labelKey: { type: String, required: true },
    idKey: { type: String, required: true },
    checkedIds: { type: Array, required: true },
    parentPath: { type: Array, default: () => [] },
    checkedBgColor: { type: String, default: '#fff' }, // 你喜欢的默认色
     multiple: { type: Boolean, default: true }
  },
  data() {
    return {
      expanded: false
    }
  },
  computed: {
    checked() {
      return this.checkedIds.includes(this.node[this.idKey]);
    },
    hasChildren() {
      return Array.isArray(this.node[this.childrenKey]) && this.node[this.childrenKey].length > 0;
    },
  },
  methods: {
    onCheck(e) {
      this.$emit('check-change', { id: this.node[this.idKey], label: this.node[this.labelKey], checked: e.detail.value.length > 0 });
    },
    onRadio(e) {
    // radio-group change 事件 e.detail.value 是选中的 value
    this.$emit('check-change',  { id: this.node[this.idKey], label: this.node[this.labelKey], checked: e.detail.value === String(this.node[this.idKey]) } );
  },
    toggleExpand() {
      this.expanded = !this.expanded;
    },
  }
}
</script>

<style scoped lang="scss">
.cell-box {
  display: flex;
  flex-direction: row;
  align-items: center;
  justify-content: flex-start;
  position: relative;
  box-sizing: border-box;
  width: 100%;
//   padding: 26rpx 32rpx;
  padding: 18rpx 32rpx;
  margin-bottom: 20rpx;
  font-size: 28rpx;
  line-height: 54rpx;
  color: #606266;
  background-color: #fff;
  text-align: left;
  .expand-icon {
    width: 20rpx;
    text-align: center;
    cursor: pointer;
    margin-right: 8rpx;
    user-select: none;
    font-size: 16rpx;
  }
  .label {
    flex: 1;
    margin-right: 20rpx;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 1;
    overflow: hidden;
  }
  .box-active {
    color: rgb(49, 144, 243);
  }
  >image {
    width: 32rpx;
    height: 32rpx;
  }
}
/* 用border画三角形 */
.triangle {
  width: 0;
  height: 0;
  border-style: solid;
}
.right {
  border-width: 8rpx 0 8rpx 10rpx;
  border-color: transparent transparent transparent #4D4D4D;
}
.down {
  border-width: 10rpx 8rpx 0 8rpx;
  border-color: #4D4D4D transparent transparent transparent;
}
</style>