invest-research-frontend/web-app/src/components/SideNav.vue

<template>
  <aside v-if="sidebarDepth > 0" class="sidebar">
    <div v-if="topLabel" class="sb-label sb-top">{{ topLabel }}</div>

    <div v-if="items.length" class="sb-section">
      <div
        v-for="item in items"
        :key="item.id"
        :class="['sb-item', { active: isActive(item) }]"
        @click="onClick(item)"
      >
        <span class="ico">●</span>
        <span class="label">{{ item.name }}</span>
      </div>
    </div>
    <div v-else class="sb-placeholder">该分类暂无子菜单</div>
  </aside>
</template>

<script setup>
import { computed, onMounted } from 'vue'
import { useRouter, useRoute } from 'vue-router'
import { useMenu } from '@/store/menu'

const router = useRouter()
const route = useRoute()
const { state, load, sidebarItems, sidebarDepth, cascadeSelection, topBarLevelCount } = useMenu()

// 侧边栏要展示的项由菜单 store 派生：始终是菜单树的最后一层
const items = computed(() => sidebarItems.value)
const sidebarVisible = computed(() => sidebarDepth.value > 0)

// 侧边栏标题：取上边栏最后一行选中项的名称（即层级最深的可见项）
const topLabel = computed(() => {
  if (!sidebarVisible.value) return ''
  const sel = cascadeSelection.value
  const idx = topBarLevelCount.value - 1
  return sel[idx]?.name || sel[0]?.name || ''
})

onMounted(() => {
  if (!state.loaded) load()
})

function isActive(item) {
  if (!item?.route) return false
  return route.path === item.route || route.path.startsWith(`${item.route}/`)
}

function onClick(item) {
  if (!item?.route) return
  if (route.path !== item.route) router.push(item.route)
}

function iconChar(item) {
  if (!item?.icon) return '●'
  const trimmed = String(item.icon).trim()
  if (!trimmed) return '●'
  // 简单把首字符作为图标占位（未引入图标库时退化为单字符）
  return trimmed.charAt(0).toUpperCase()
}
</script>

<style scoped>
.sidebar {
  width: 208px;
  flex: none;
  background: #0c2b5e;
  color: rgba(255, 255, 255, 0.78);
  padding: 14px 0;
  overflow-y: auto;
}

.sb-section {
  padding: 0 12px;
  margin-bottom: 16px;
}

.sb-label {
  font-size: 10.5px;
  color: rgba(255, 255, 255, 0.4);
  padding: 6px 14px;
  margin-bottom: 6px;
  letter-spacing: 1px;
}

.sb-top {
  font-size: 12px;
  color: rgba(255, 255, 255, 0.7);
  letter-spacing: 0.5px;
}

.sb-item {
  display: flex;
  align-items: center;
  gap: 11px;
  padding: 9px 14px;
  border-radius: 6px;
  font-size: 12.5px;
  cursor: pointer;
  color: rgba(255, 255, 255, 0.78);
  margin-bottom: 2px;
  transition: 0.15s;
}

.sb-item:hover {
  background: #143a80;
  color: #fff;
}

.sb-item.active {
  background: #fff;
  color: #0c2b5e;
  font-weight: 600;
}

.sb-item.active .ico {
  color: #1552d0;
}

.sb-item .ico {
  width: 14px;
  height: 14px;
  font-size: 13px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  color: rgba(255, 255, 255, 0.6);
  font-weight: 700;
  flex: none;
}

.sb-item .label {
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.sb-item .num {
  font-size: 10px;
  color: #fff;
  background: #e13b3b;
  padding: 1px 5px;
  border-radius: 8px;
  font-weight: 600;
}

.sb-divider {
  height: 1px;
  background: rgba(255, 255, 255, 0.1);
  margin: 8px 14px;
}

.sb-placeholder {
  padding: 12px 26px;
  font-size: 12px;
  color: rgba(255, 255, 255, 0.4);
}
</style>