<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>
              <template v-for="item in columns"
                :key="item.key">
                <el-dropdown-item>
                  <el-checkbox :checked="item.visible"
                    @change="checkboxChange($event, item.label)"
                    :label="item.label" />
                </el-dropdown-item>
              </template>
            </el-dropdown-menu>
          </template>
        </el-dropdown>
      </el-tooltip>
      <!-- 自定义功能 -->
      <slot></slot>
    </el-row>
    <el-dialog :title="title"
      v-model="open"
      append-to-body>
      <el-transfer :titles="['显示', '隐藏']"
        v-model="value"
        :data="columns"
        @change="dataChange"></el-transfer>
    </el-dialog>
  </div>
</template>

<script setup>
const props = defineProps({
  /* 是否显示检索条件 */
  showSearch: {
    type: Boolean,
    default: true,
  },
  /* 显隐列信息 */
  columns: {
    type: Array,
  },
  /* 是否显示检索图标 */
  search: {
    type: Boolean,
    default: true,
  },
  /* 显隐列类型（transfer穿梭框、checkbox复选框） */
  showColumnsType: {
    type: String,
    default: "checkbox",
  },
  /* 右外边距 */
  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;
});

// 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));
    }
  }
}

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

</script>

<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;
  }

  :deep(.el-dropdown-menu__item) {
    line-height: 30px;
    padding: 0 17px;
  }

  :deep(.el-button) {
    margin-left: 12px;
  }

  .el-dropdown {
    .el-button {
      margin-left: 0;
    }
  }

</style>
