admin-web/src/app/components/WorkspaceTabs.vue

<script setup lang="ts">
import '@/styles/adminDensity.css'
import '@/styles/adminWorkbench.css'
import { computed, nextTick, ref, watch } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { ElMessage, ElMessageBox } from 'element-plus'
import { MoreHorizontal, X } from '@lucide/vue'
import { useAccessPreviewStore } from '@/core/access/accessPreview'
import { useUnsavedWorkStore } from '@/core/unsaved-work/unsavedWork'
import { workspaceTabCandidate } from '@/core/workspace-tabs/routeWorkspace'
import { useWorkspaceTabsStore } from '@/core/workspace-tabs/workspaceTabs'

type CloseCommand = 'current' | 'others' | 'right' | 'all'

const route = useRoute()
const router = useRouter()
const access = useAccessPreviewStore()
const unsaved = useUnsavedWorkStore()
const workspace = useWorkspaceTabsStore()
const tabListRef = ref<HTMLElement>()

const activeIndex = computed(() => workspace.tabs.findIndex((tab) => tab.id === workspace.activeId))
const hasRightTabs = computed(() => activeIndex.value >= 0 && activeIndex.value < workspace.tabs.length - 1)

function blockingEntries(tabIds: readonly string[]) {
  return tabIds.flatMap((tabId) => unsaved.findForWorkspace(tabId))
}

async function confirmDiscard(tabIds: readonly string[]) {
  const blocking = blockingEntries(tabIds)
  if (blocking.length === 0) return true
  const labels = [...new Set(blocking.map((entry) => entry.label))]
  try {
    await ElMessageBox.confirm(
      `以下内容尚未保存：${labels.join('、')}。关闭页签后将放弃这些修改。`,
      '放弃未保存的修改？',
      { confirmButtonText: '放弃并关闭', cancelButtonText: '继续编辑', type: 'warning', customClass: 'admin-density-confirm' },
    )
    return true
  } catch {
    return false
  }
}

async function focusActiveTab() {
  await nextTick()
  const active = tabListRef.value?.querySelector<HTMLElement>('[role="tab"][aria-selected="true"]')
  active?.focus({ preventScroll: true })
  active?.scrollIntoView?.({ block: 'nearest', inline: 'nearest' })
}

async function navigateToFallback(path: string | null) {
  const destination = path || access.firstAccessiblePath
  if (!destination) {
    await router.push('/403')
    return
  }
  if (destination === route.fullPath) {
    const candidate = workspaceTabCandidate(route)
    if (candidate) workspace.open(candidate, unsaved.dirtyWorkspaceIds)
    await focusActiveTab()
    return
  }
  await router.push(destination)
}

async function closeTabs(tabIds: readonly string[]) {
  const uniqueIds = [...new Set(tabIds)].filter((id) => workspace.tabs.some((tab) => tab.id === id))
  if (uniqueIds.length === 0 || !await confirmDiscard(uniqueIds)) return
  const activeWillClose = workspace.activeId !== null && uniqueIds.includes(workspace.activeId)
  unsaved.removeWorkspaces(uniqueIds)
  const fallback = workspace.removeByIds(uniqueIds)
  if (activeWillClose) await navigateToFallback(fallback?.path ?? null)
  else await focusActiveTab()
}

async function activateTab(path: string) {
  if (path === route.fullPath) return
  try {
    await router.push(path)
  } catch {
    ElMessage.error('页签切换失败，请重试')
  }
}

function idsForCommand(command: CloseCommand) {
  if (command === 'all') return workspace.tabs.map((tab) => tab.id)
  if (command === 'others') return workspace.tabs.filter((tab) => tab.id !== workspace.activeId).map((tab) => tab.id)
  if (command === 'right') return workspace.tabs.slice(activeIndex.value + 1).map((tab) => tab.id)
  return workspace.activeId ? [workspace.activeId] : []
}

function handleCommand(command: CloseCommand) {
  void closeTabs(idsForCommand(command))
}

function handleTabKeydown(event: KeyboardEvent, index: number) {
  if (event.key !== 'ArrowLeft' && event.key !== 'ArrowRight') return
  event.preventDefault()
  const buttons = [...(tabListRef.value?.querySelectorAll<HTMLElement>('[role="tab"]') ?? [])]
  if (buttons.length === 0) return
  const direction = event.key === 'ArrowRight' ? 1 : -1
  buttons[(index + direction + buttons.length) % buttons.length]?.focus()
}

function handleTabWheel(event: WheelEvent) {
  const tabList = tabListRef.value
  if (!tabList || tabList.scrollWidth <= tabList.clientWidth) return
  const delta = Math.abs(event.deltaX) > Math.abs(event.deltaY) ? event.deltaX : event.deltaY
  if (delta === 0) return
  const maxScrollLeft = tabList.scrollWidth - tabList.clientWidth
  const canScroll = delta < 0 ? tabList.scrollLeft > 0 : tabList.scrollLeft < maxScrollLeft
  if (!canScroll) return
  event.preventDefault()
  tabList.scrollLeft = Math.max(0, Math.min(maxScrollLeft, tabList.scrollLeft + delta))
}

watch(
  () => workspace.activeId,
  async () => {
    await nextTick()
    const active = tabListRef.value?.querySelector<HTMLElement>('[aria-selected="true"]')
    active?.scrollIntoView?.({ block: 'nearest', inline: 'nearest' })
  },
)
</script>

<template>
  <section class="workspace-tabs admin-workbench" aria-label="页面工作区">
    <div ref="tabListRef" class="workspace-tab-list" role="tablist" aria-label="已打开页面" @wheel="handleTabWheel">
      <div
        v-for="(tab, index) in workspace.tabs"
        :key="tab.id"
        class="workspace-tab"
        :class="{ 'is-active': tab.id === workspace.activeId, 'is-dirty': unsaved.dirtyWorkspaceIds.has(tab.id) }"
      >
        <button
          class="workspace-tab-activate"
          type="button"
          role="tab"
          :aria-selected="tab.id === workspace.activeId"
          :tabindex="tab.id === workspace.activeId ? 0 : -1"
          :title="tab.title"
          @click="activateTab(tab.path)"
          @keydown="handleTabKeydown($event, index)"
        >
          <span class="workspace-tab-label">{{ tab.title }}</span>
          <span v-if="unsaved.dirtyWorkspaceIds.has(tab.id)" class="workspace-tab-dirty" aria-label="有未保存修改" />
        </button>
        <button
          class="workspace-tab-close"
          type="button"
          :aria-label="`关闭页签：${tab.title}`"
          :title="`关闭 ${tab.title}`"
          @click="closeTabs([tab.id])"
        ><X :size="14" aria-hidden="true" /></button>
      </div>
    </div>

    <el-dropdown trigger="click" placement="bottom-end" popper-class="admin-workbench shell-header-popper" @command="handleCommand">
      <el-button class="workspace-tab-more" text aria-label="页签管理" title="页签管理">
        <MoreHorizontal :size="18" aria-hidden="true" />
      </el-button>
      <template #dropdown>
        <el-dropdown-menu>
          <el-dropdown-item command="current" :disabled="!workspace.activeId">关闭当前</el-dropdown-item>
          <el-dropdown-item command="others" :disabled="workspace.tabs.length <= 1">关闭其他</el-dropdown-item>
          <el-dropdown-item command="right" :disabled="!hasRightTabs">关闭右侧</el-dropdown-item>
          <el-dropdown-item command="all" :disabled="workspace.tabs.length === 0" divided>关闭全部</el-dropdown-item>
        </el-dropdown-menu>
      </template>
    </el-dropdown>
  </section>
</template>

<style scoped>
.workspace-tabs {
  position: sticky;
  top: 64px;
  z-index: 14;
  display: flex;
  min-width: 0;
  height: 44px;
  align-items: stretch;
  border-bottom: 1px solid var(--workbench-border);
  background: var(--workbench-surface);
}
.workspace-tab-list {
  display: flex;
  min-width: 0;
  flex: 1;
  align-items: flex-end;
  gap: 4px;
  overflow-x: auto;
  padding: 6px 8px 0;
  overscroll-behavior-inline: contain;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.workspace-tab-list::-webkit-scrollbar { display: none; width: 0; height: 0; }
.workspace-tab {
  display: flex;
  min-width: 126px;
  max-width: 220px;
  height: 38px;
  flex: 0 0 auto;
  align-items: center;
  border: 1px solid transparent;
  border-bottom: 0;
  border-radius: 8px 8px 0 0;
  color: var(--workbench-muted);
}
.workspace-tab:hover { background: var(--workbench-surface-soft); color: var(--workbench-text); }
.workspace-tab.is-active { border-color: var(--workbench-accent-border); background: var(--workbench-accent-soft); color: var(--workbench-primary); }
.workspace-tab-activate {
  display: flex;
  min-width: 0;
  height: 100%;
  flex: 1;
  align-items: center;
  gap: 7px;
  padding: 0 4px 0 12px;
  border: 0;
  background: transparent;
  color: inherit;
  cursor: pointer;
  font: inherit;
  text-align: left;
}
.workspace-tab-label { overflow: hidden; font-size: 12px; font-weight: 620; text-overflow: ellipsis; white-space: nowrap; }
.workspace-tab-dirty { width: 6px; height: 6px; flex: 0 0 auto; border-radius: 50%; background: #d97706; }
.workspace-tab-close {
  display: grid;
  width: 30px;
  height: 30px;
  flex: 0 0 30px;
  place-items: center;
  margin-right: 3px;
  border: 0;
  border-radius: 6px;
  background: transparent;
  color: var(--workbench-muted);
  cursor: pointer;
}
.workspace-tab-close:hover { background: var(--workbench-accent-border); color: var(--workbench-primary); }
.workspace-tab-activate:focus-visible,
.workspace-tab-close:focus-visible { outline: 2px solid var(--workbench-primary); outline-offset: -2px; }
.workspace-tab-more { width: 44px; height: 44px; flex: 0 0 44px; border-radius: 0; border-left: 1px solid var(--workbench-border); color: var(--workbench-muted); }

@media (max-width: 720px) {
  .workspace-tabs { top: 64px; height: 48px; }
  .workspace-tab-list { align-items: center; padding: 4px 6px; }
  .workspace-tab { min-width: 140px; height: 40px; border-bottom: 1px solid transparent; border-radius: 8px; }
  .workspace-tab.is-active { border-color: var(--workbench-accent-border); }
  .workspace-tab-close { width: 34px; height: 34px; flex-basis: 34px; }
  .workspace-tab-more { height: 48px; }
}

@media (prefers-reduced-motion: reduce) {
  .workspace-tab-list { scroll-behavior: auto; }
}
</style>