feat: add scrollable tab bar (#49)

* feat: add scrollbar support and enhance tab navigation  finish:1/2

* update

* feat: 添加当前tab滚动功能并优化滚动条样式

* feat: 重构tab滚动逻辑，新增useTabScroll钩子以优化当前tab滚动体验

* feat: 优化TabBar组件，移除冗余代码并整合useTabScroll钩子

* fix: silly bug

* refactor: Remove the debugging log

---------

Co-authored-by: Vigo.zhou <eq1024@foxmail.com>

src/hooks/useTabScroll.ts

@@ -0,0 +1,64 @@
+import type { NScrollbar } from 'naive-ui'
+import { ref, watchEffect, type Ref } from 'vue'
+import { throttle } from 'radash'
+
+export function useTabScroll(currentTabPath: Ref<string>) {
+  const scrollbar = ref<InstanceType<typeof NScrollbar>>()
+  const safeArea = ref(150)
+
+  const handleTabSwitch = (distance: number) => {
+    scrollbar.value?.scrollTo({
+      left: distance,
+      behavior: 'smooth'
+    })
+  }
+
+  const scrollToCurrentTab = () => {
+    nextTick(() => {
+      const currentTabElement = document.querySelector(`[data-tab-path="${currentTabPath.value}"]`) as HTMLElement
+      const tabBarScrollWrapper = document.querySelector('.tab-bar-scroller-wrapper .n-scrollbar-container')
+      const tabBarScrollContent = document.querySelector('.tab-bar-scroller-content')
+      
+      if (currentTabElement && tabBarScrollContent && tabBarScrollWrapper) {
+        const tabLeft = currentTabElement.offsetLeft
+        const tabBarLeft = tabBarScrollWrapper.scrollLeft
+        const wrapperWidth = tabBarScrollWrapper.getBoundingClientRect().width
+        const tabWidth = currentTabElement.getBoundingClientRect().width
+        const containerPR = Number.parseFloat(window.getComputedStyle(tabBarScrollContent).paddingRight)
+
+        if (tabLeft + tabWidth + safeArea.value + containerPR > wrapperWidth + tabBarLeft) {
+          handleTabSwitch(tabLeft + tabWidth + containerPR - wrapperWidth + safeArea.value)
+        } else if (tabLeft - safeArea.value < tabBarLeft) {
+          handleTabSwitch(tabLeft - safeArea.value)
+        }
+      }
+    })
+  }
+
+  const handleScroll = throttle({ interval: 120 }, (step: number) => {
+    scrollbar.value?.scrollBy({
+      left: step * 400,
+      behavior: 'smooth'
+    })
+  })
+
+  const onWheel = (e: WheelEvent) => {
+    e.preventDefault()
+    if (Math.abs(e.deltaY) > Math.abs(e.deltaX)) {
+      handleScroll(e.deltaY > 0 ? 1 : -1)
+    }
+  }
+
+  watchEffect(() => {
+    if (currentTabPath.value) {
+      scrollToCurrentTab()
+    }
+  })
+
+  return {
+    scrollbar,
+    onWheel,
+    safeArea,
+    handleTabSwitch
+  }
+}

src/layouts/components/tab/TabBar.vue

@@ -1,6 +1,7 @@
 <script setup lang="ts">
 import type { RouteLocationNormalized } from 'vue-router'
 import { useAppStore, useTabStore } from '@/store'
+import { useTabScroll } from '@/hooks/useTabScroll'
 import { useDraggable } from 'vue-draggable-plus'
 import IconClose from '~icons/icon-park-outline/close'
 import IconDelete from '~icons/icon-park-outline/delete-four'
@@ -17,6 +18,8 @@ const tabStore = useTabStore()
 const { tabs } = storeToRefs(useTabStore())
 const appStore = useAppStore()
 
+const {scrollbar, onWheel } = useTabScroll(computed(() => tabStore.currentTabPath))
+
 const router = useRouter()
 function handleTab(route: RouteLocationNormalized) {
   router.push(route.fullPath)
@@ -111,6 +114,7 @@ useDraggable(el, tabs, {
 </script>
 
 <template>
+  <n-scrollbar ref="scrollbar" class="relative flex tab-bar-scroller-wrapper" content-class="pr-34 tab-bar-scroller-content" :x-scrollable="true" @wheel="onWheel">
     <div class="p-l-2 flex w-full relative">
       <div class="flex items-end">
         <TabBarItem
@@ -120,7 +124,12 @@ useDraggable(el, tabs, {
       </div>
       <div ref="el" class="flex items-end flex-1">
         <TabBarItem
-        v-for="item in tabStore.tabs" :key="item.fullPath" :value="tabStore.currentTabPath" :route="item" closable
+          v-for="item in tabStore.tabs"
+          :key="item.fullPath"
+          :value="tabStore.currentTabPath"
+          :route="item"
+          closable
+          :data-tab-path="item.fullPath"
           @close="tabStore.closeTab"
           @click="handleTab(item)"
           @contextmenu="handleContextMenu($event, item)"
@@ -130,13 +139,13 @@ useDraggable(el, tabs, {
           :on-clickoutside="onClickoutside" @select="handleSelect"
         />
       </div>
-    <!-- <span class="m-l-auto" /> -->
-    <n-el class="absolute right-0 flex items-center gap-1 bg-[var(--base-color)] h-full">
+    </div>
+    <n-el class="absolute right-0 top-0 flex items-center gap-1 bg-[var(--base-color)] h-full">
       <Reload />
       <ContentFullScreen />
       <DropTabs />
     </n-el>
-  </div>
+  </n-scrollbar>
 </template>
 
 <style scoped>