<script setup>
const props = defineProps({
  showSearch: {
    type: Boolean,
    default: true,
  },
  /* 显隐列类型（transfer穿梭框、checkbox复选框） */
  showColumnsType: {
    type: String,
    default: "transfer",
  },
  columns: {
    type: Array,
  },
  search: {
    type: Boolean,
    default: true,
  },
  gutter: {
    type: Number,
    default: 10,
  },
})

const emits = defineEmits(['update:showSearch', 'queryTable']);

// 显隐数据
const value = ref([]);
// 弹出层标题
const title = ref("显示/隐藏");
// 是否显示弹出层
const open = ref(false);

const style = computed(() => {
  const ret = {};
  if (props.gutter) {
    ret.marginRight = `${props.gutter / 2}px`;
  }
  return ret;
});

const isChecked = computed({
  get() {
    return props.columns.every((col) => col.visible);
  },
  set() { }
});
const isIndeterminate = computed(() => {
  return props.columns.some((col) => col.visible) && !isChecked.value;
});
// 搜索
function toggleSearch() {
  emits("update:showSearch", !props.showSearch);
}

// 刷新
function refresh() {
  emits("queryTable");
}

// 右侧列表元素变化
function dataChange(data) {
  for (let item in props.columns) {
    const key = props.columns[item].key;
    props.columns[item].visible = !data.includes(key);
  }
}

// 打开显隐列dialog
function showColumn() {
  open.value = true;
}

if (props.showColumnsType == 'transfer') {
  // 显隐列初始默认隐藏列
  for (let item in props.columns) {
    if (props.columns[item].visible === false) {
      value.value.push(parseInt(item));
    }
  }
}

// 单勾选
function checkboxChange(event, label) {
  props.columns.filter(item => item.label == label)[0].visible = event;
}

// 切换全选/反选
function toggleCheckAll() {
  const newValue = !isChecked.value;
  props.columns.forEach((col) => (col.visible = newValue))
}
</script>
<template>
  <div class="top-right-btn" :style="style">
    <el-row>
      <el-tooltip class="item" effect="dark" :content="showSearch ? '隐藏搜索' : '显示搜索'" placement="top" v-if="search">
        <el-button circle icon="Search" @click="toggleSearch()" />
      </el-tooltip>
      <el-tooltip class="item" effect="dark" content="刷新" placement="top">
        <el-button circle icon="Refresh" @click="refresh()" />
      </el-tooltip>
      <el-tooltip class="item" effect="dark" content="显隐列" placement="top" v-if="columns">
        <el-button circle icon="Menu" @click="showColumn()" v-if="showColumnsType == 'transfer'" />
        <el-dropdown trigger="click" :hide-on-click="false" style="padding-left: 12px"
          v-if="showColumnsType == 'checkbox'">
          <el-button circle icon="Menu" />
          <template #dropdown>
            <el-dropdown-menu>
              <!-- 全选/反选 按钮 -->
              <el-dropdown-item>
                <el-checkbox :indeterminate="isIndeterminate" v-model="isChecked" @change="toggleCheckAll"> 列展示
                </el-checkbox>
              </el-dropdown-item>
              <div class="check-line"></div>
              <template v-for="item in columns" :key="item.key">
                <el-dropdown-item>
                  <el-checkbox v-model="item.visible" @change="checkboxChange($event, item.label)"
                    :label="item.label" />
                </el-dropdown-item>
              </template>
            </el-dropdown-menu>
          </template>
        </el-dropdown>
      </el-tooltip>
    </el-row>
    <el-dialog :title="title" v-model="open" append-to-body>
      <div class="my-el-transfer">
        <el-transfer :titles="['显示', '隐藏']" v-model="value" :data="columns" @change="dataChange" />
      </div>
    </el-dialog>
  </div>
</template>
<style lang='scss' scoped>
:deep(.el-transfer__button) {
  // border-radius: 50%;
  display: block;
  margin-left: 0px;
}

:deep(.el-transfer__button:first-child) {
  margin-bottom: 10px;
}

.my-el-transfer {
  text-align: center;
}

.check-line {
  width: 90%;
  height: 1px;
  background-color: #ccc;
  margin: 3px auto;
}
</style>