BMS/bms-front/src/components/TableCopyMenu/index.vue

<template>
  <Teleport to="body">
    <ul
      v-if="menu.visible"
      ref="menuRef"
      class="table-copy-menu"
      :style="{ left: menu.x + 'px', top: menu.y + 'px' }"
      @click.stop
      @contextmenu.prevent
    >
      <li class="tcm-title">复制{{ menu.rows.length }}{{ entityLabel }}记录的列值</li>
      <li
        v-for="col in shownColumns"
        :key="col.key"
        class="tcm-item"
        @click="handleCopy(col)"
      >
        {{ col.label }}
      </li>
      <li v-if="!shownColumns.length" class="tcm-empty">暂无可复制的列</li>
    </ul>
  </Teleport>
</template>

<script setup name="TableCopyMenu">
/**
 * 表格右键复制列值菜单
 *
 * 用法：
 *   <el-table @row-contextmenu="(row, col, ev) => copyMenuRef.open(row, ev)">
 *   <table-copy-menu ref="copyMenuRef" :columns="copyColumns" :selected-rows="selectedRows" />
 *
 * columns: [{ key: '字段名', label: '列名', get?: (row) => string }]
 *   - get 缺省时取 row[key]
 * visibleKeys: 传入时只显示其中的列（配合「列设置」当前可见列）
 * selectedRows: 表格勾选行；非空时复制勾选行，否则只复制当前右键行
 */
const props = defineProps({
  columns: {
    type: Array,
    default: () => []
  },
  selectedRows: {
    type: Array,
    default: () => []
  },
  visibleKeys: {
    type: Array,
    default: null
  },
  // 量词：客户/供应商用「条」，收款单用「笔」
  entityLabel: {
    type: String,
    default: '条'
  }
})

const { proxy } = getCurrentInstance()

const MENU_WIDTH = 190
const ITEM_HEIGHT = 34
const TITLE_HEIGHT = 46
const MENU_MAX_HEIGHT = 340

const menuRef = ref(null)
const menu = reactive({ visible: false, x: 0, y: 0, rows: [] })

const shownColumns = computed(() => {
  if (!props.visibleKeys) return props.columns
  return props.columns.filter(c => props.visibleKeys.includes(c.key))
})

/** 打开右键菜单：有勾选行则复制勾选行，否则只复制当前右键行 */
function open(row, event) {
  // 阻止浏览器原生右键菜单
  event.preventDefault()
  menu.rows = props.selectedRows && props.selectedRows.length ? props.selectedRows : [row]
  const height = Math.min(TITLE_HEIGHT + shownColumns.value.length * ITEM_HEIGHT, MENU_MAX_HEIGHT)
  menu.x = Math.min(event.clientX, window.innerWidth - MENU_WIDTH - 8)
  menu.y = Math.min(event.clientY, window.innerHeight - height - 8)
  menu.visible = true
  addListeners()
}

function close() {
  if (!menu.visible) return
  menu.visible = false
  removeListeners()
}

function onDocPointerDown(e) {
  if (e.target.closest && e.target.closest('.table-copy-menu')) return
  close()
}
function onDocKeydown(e) {
  if (e.key === 'Escape') close()
}
function onWindowScroll() {
  close()
}

function addListeners() {
  document.addEventListener('mousedown', onDocPointerDown, true)
  document.addEventListener('keydown', onDocKeydown)
  window.addEventListener('scroll', onWindowScroll, true)
}
function removeListeners() {
  document.removeEventListener('mousedown', onDocPointerDown, true)
  document.removeEventListener('keydown', onDocKeydown)
  window.removeEventListener('scroll', onWindowScroll, true)
}

/** 兼容非安全上下文（http）的剪贴板写入 */
async function copyToClipboard(text) {
  if (navigator.clipboard && window.isSecureContext) {
    try {
      await navigator.clipboard.writeText(text)
      return true
    } catch (err) {
      // 走降级方案
    }
  }
  const textarea = document.createElement('textarea')
  textarea.value = text
  textarea.style.position = 'fixed'
  textarea.style.top = '-9999px'
  textarea.style.opacity = '0'
  document.body.appendChild(textarea)
  textarea.focus()
  textarea.select()
  let ok = false
  try {
    ok = document.execCommand('copy')
  } catch (err) {
    ok = false
  }
  document.body.removeChild(textarea)
  return ok
}

async function handleCopy(col) {
  const getter = typeof col.get === 'function' ? col.get : row => (row[col.key] === null || row[col.key] === undefined ? '' : row[col.key])
  const values = menu.rows
    .map(getter)
    .map(v => String(v == null ? '' : v).trim())
    .filter(v => v !== '' && v !== '-')
  close()
  if (!values.length) {
    proxy.$modal.msgWarning(`所选记录的「${col.label}」均为空，无可复制内容`)
    return
  }
  const ok = await copyToClipboard(values.join('\n'))
  if (ok) {
    proxy.$modal.msgSuccess(`已复制 ${values.length} ${props.entityLabel}记录的「${col.label}」`)
  } else {
    proxy.$modal.msgError('复制失败，请检查浏览器剪贴板权限')
  }
}

// keep-alive 页面切走时关闭菜单（菜单 teleport 在 body，否则会残留在页面上）
onDeactivated(close)
onBeforeUnmount(removeListeners)

defineExpose({ open, close })
</script>

<style scoped>
.table-copy-menu {
  position: fixed;
  z-index: 3000;
  min-width: 170px;
  max-height: 340px;
  margin: 0;
  padding: 4px 0;
  overflow-y: auto;
  list-style: none;
  background: var(--el-bg-color);
  border: 1px solid var(--el-border-color-light);
  border-radius: 4px;
  box-shadow: var(--el-box-shadow-light);
  user-select: none;
}
.table-copy-menu .tcm-title {
  padding: 4px 14px 6px;
  font-size: 12px;
  color: var(--el-text-color-secondary);
  pointer-events: none;
  border-bottom: 1px solid var(--el-border-color-lighter);
  margin-bottom: 4px;
}
.table-copy-menu .tcm-item {
  padding: 7px 16px;
  font-size: 13px;
  color: var(--el-text-color-regular);
  cursor: pointer;
}
.table-copy-menu .tcm-item:hover {
  background: var(--el-color-primary-light-9);
  color: var(--el-color-primary);
}
.table-copy-menu .tcm-empty {
  padding: 8px 16px;
  font-size: 12px;
  color: var(--el-text-color-secondary);
}
</style>