添加 Toast 通知功能，优化鼠标悬浮和键盘导航逻辑，增强用户交互体验。临时禁用鼠标悬浮功能以避免误操作，并在列表边界触发时提供反馈。

src/App.vue

@@ -54,11 +54,22 @@ const showContextMenu = (data) => {
   listFrozen.value = true // 冻结列表
 }
 
+// 添加一个状态来控制临时禁用鼠标悬浮
+const temporaryDisableHover = ref(false)
+let hoverDisableTimer = null
+
 // 修改关闭菜单的处理
 const closeMenu = () => {
   showMenu.value = false
   listFrozen.value = false
   selectedMenuIndex.value = -1 // 重置菜单选中项
+  
+  // 临时禁用鼠标悬浮
+  temporaryDisableHover.value = true
+  if (hoverDisableTimer) clearTimeout(hoverDisableTimer)
+  hoverDisableTimer = setTimeout(() => {
+    temporaryDisableHover.value = false
+  }, 300) // 300ms 后恢复鼠标悬浮功能
 }
 
 // 添加当前选中的菜单项索引
@@ -69,17 +80,9 @@ const handleKeyDown = (e) => {
   if (e.key === 'ArrowRight' && !showMenu.value && selectedItem.value) {
     e.preventDefault()
     handleMenuTriggerClick(e)
-  } else if (e.key === 'ArrowLeft' && showMenu.value) {
+  } else if ((e.key === 'ArrowLeft' || e.key === 'Escape') && showMenu.value) {
     e.preventDefault()
-    showMenu.value = false
+    closeMenu()
-    listFrozen.value = false
-    selectedMenuIndex.value = -1 // 重置菜单选中项
-  } else if (e.key === 'Escape') {
-    // ESC 键只在菜单打开时响应
-    if (showMenu.value) {
-      e.preventDefault()
-      closeMenu()
-    }
   } else if (showMenu.value) {
     switch (e.key) {
       case 'ArrowUp':
@@ -108,7 +111,7 @@ const handleKeyDown = (e) => {
 }
 
 onMounted(() => {
-  // 添加全局点击事件来关闭菜单
+  // 添加全局击事件来关闭菜单
   document.addEventListener('click', closeMenu)
   // 添加键盘事件监听
   document.addEventListener('keydown', handleKeyDown)
@@ -118,6 +121,12 @@ onBeforeUnmount(() => {
   document.removeEventListener('click', closeMenu)
   // 移除键盘事件监听
   document.removeEventListener('keydown', handleKeyDown)
+  if (toastTimer) {
+    clearTimeout(toastTimer)
+  }
+  if (hoverDisableTimer) {
+    clearTimeout(hoverDisableTimer)
+  }
 })
 
 // 修改菜单击处理
@@ -157,6 +166,32 @@ const onAfterLeave = (el) => {
   // 过渡结束后重置样式
   el.style.display = ''
 }
+
+// 添加 toast 相关状态
+const toastVisible = ref(false)
+const toastMessage = ref('')
+let toastTimer = null
+
+// 添加 toast 处理函数
+const showToast = (message) => {
+  if (toastTimer) {
+    clearTimeout(toastTimer)
+  }
+  
+  toastMessage.value = message
+  toastVisible.value = true
+  
+  toastTimer = setTimeout(() => {
+    toastVisible.value = false
+  }, 3000)
+}
+
+// 在 onBeforeUnmount 中清理定时器
+onBeforeUnmount(() => {
+  if (toastTimer) {
+    clearTimeout(toastTimer)
+  }
+})
 </script>
 
 <template>
@@ -166,9 +201,11 @@ const onAfterLeave = (el) => {
         :data="listData"
         :config="listConfig"
         :frozen="listFrozen"
+        :disable-hover="showMenu || temporaryDisableHover"
         @select="handleSelect"
         @click="handleClick"
         @contextmenu="showContextMenu"
+        @showToast="showToast"
       />
     </div>
     <div class="toolbar">
@@ -211,6 +248,12 @@ const onAfterLeave = (el) => {
         </div>
       </div>
     </div>
+    <!-- 添加 Toast 组件 -->
+    <transition name="toast">
+      <div v-if="toastVisible" class="toast">
+        {{ toastMessage }}
+      </div>
+    </transition>
   </div>
 </template>
 
@@ -365,4 +408,32 @@ body {
   word-break: break-all;
   line-height: 1.5;
 }
+
+/* 添加 Toast 相关样式 */
+.toast {
+  position: fixed;
+  top: 50%;
+  left: 50%;
+  transform: translate(-50%, -50%);
+  background: rgba(0, 0, 0, 0.8);
+  color: white;
+  padding: 12px 24px;
+  border-radius: 8px;
+  font-size: 14px;
+  z-index: 1000;
+  pointer-events: none;
+  max-width: 80%;
+  text-align: center;
+}
+
+.toast-enter-active,
+.toast-leave-active {
+  transition: all 0.3s ease;
+}
+
+.toast-enter-from,
+.toast-leave-to {
+  opacity: 0;
+  transform: translate(-50%, -40%);
+}
 </style>

src/components/VirtualList.vue

@@ -25,10 +25,14 @@ const props = defineProps({
   frozen: {
     type: Boolean,
     default: false
+  },
+  disableHover: {
+    type: Boolean,
+    default: false
   }
 })
 
-const emit = defineEmits(['select', 'click', 'contextmenu'])
+const emit = defineEmits(['select', 'click', 'contextmenu', 'showToast'])
 
 // 计算列表项实际总高度
 const totalItemHeight = computed(() => 
@@ -133,9 +137,13 @@ const handleScroll = debounce(() => {
   }
 }, props.config.scrollDebounceTime)
 
-// 鼠标移入处理
+// 添加一个状态来控制是否禁用鼠标悬浮
+const disableHover = ref(false)
+let hoverTimer = null
+
+// 修改鼠标移入处理函数
 function handleMouseEnter(index) {
-  if (props.frozen) return  // 如果列表被冻结，不响应鼠标移入
+  if (props.frozen || disableHover.value || props.disableHover) return // 增加 props.disableHover 的判断
   if (!isKeyboardNavigating.value) {
     selectedIndex.value = index
     emit('select', { ...props.data[index], index })
@@ -143,11 +151,17 @@ function handleMouseEnter(index) {
   }
 }
 
-// 键盘事件处理
+// 添加记录上次到达边界的时间
+const lastReachBoundaryTime = ref({
+  top: 0,
+  bottom: 0
+})
+
+// 修改键盘事件处理函数
 function handleKeyDown(e) {
-  if (props.frozen) return  // 如果列表被冻结，不响应键盘事件
+  if (props.frozen) return
+
   if (e.key === 'Enter') {
-    // 回车键触发点击事件
     if (selectedIndex.value >= 0 && selectedIndex.value < props.data.length) {
       const item = props.data[selectedIndex.value]
       emit('click', { ...item, index: selectedIndex.value })
@@ -157,26 +171,59 @@ function handleKeyDown(e) {
     
     const isFirstItem = selectedIndex.value === 0
     const isLastItem = selectedIndex.value === props.data.length - 1
+    const now = Date.now()
     
-    // 如果已经在第一项还按上键，或在最后一项还按下键，则不处理
+    if (e.key === 'ArrowUp' && isFirstItem) {
-    if ((e.key === 'ArrowUp' && isFirstItem) || 
+      const timeSinceLastTop = now - lastReachBoundaryTime.value.top
-        (e.key === 'ArrowDown' && isLastItem)) {
+      if (timeSinceLastTop < 5000) {
+        // 5秒内再次点击，跳转到底部
+        disableHover.value = true // 禁用鼠标悬浮
+        selectedIndex.value = props.data.length - 1
+        emit('select', { ...props.data[selectedIndex.value], index: selectedIndex.value })
+        ensureSelectedItemVisible()
+        // 1秒后恢复鼠标悬浮功能
+        if (hoverTimer) clearTimeout(hoverTimer)
+        hoverTimer = setTimeout(() => {
+          disableHover.value = false
+        }, 1000)
+      } else {
+        lastReachBoundaryTime.value.top = now
+        emit('showToast', '已经到列表顶端，再次点击将回到列表底端')
+      }
       return
     }
     
+    if (e.key === 'ArrowDown' && isLastItem) {
+      const timeSinceLastBottom = now - lastReachBoundaryTime.value.bottom
+      if (timeSinceLastBottom < 5000) {
+        // 5秒内再次点击，跳转到顶部
+        disableHover.value = true // 禁用鼠标悬浮
+        selectedIndex.value = 0
+        emit('select', { ...props.data[selectedIndex.value], index: selectedIndex.value })
+        ensureSelectedItemVisible()
+        // 1秒后恢复鼠标悬浮功能
+        if (hoverTimer) clearTimeout(hoverTimer)
+        hoverTimer = setTimeout(() => {
+          disableHover.value = false
+        }, 1000)
+      } else {
+        lastReachBoundaryTime.value.bottom = now
+        emit('showToast', '已经到列表底端，再次点击将回到列表顶端')
+      }
+      return
+    }
+    
+    // 原有的上下键处理逻辑
     isKeyboardNavigating.value = true
     if (keyboardTimer) clearTimeout(keyboardTimer)
     
-    const containerTop = containerRef.value?.scrollTop || 0
-    const containerHeight = containerRef.value?.clientHeight || 0
-    
     if (e.key === 'ArrowUp') {
       const nextIndex = Math.max(0, selectedIndex.value - 1)
       selectedIndex.value = nextIndex
       emit('select', { ...props.data[nextIndex], index: nextIndex })
       
       const itemTop = nextIndex * totalItemHeight.value
-      if (itemTop < containerTop && containerRef.value) {
+      if (itemTop < containerRef.value?.scrollTop && containerRef.value) {
         containerRef.value.scrollTop = itemTop
       }
     } else {
@@ -185,9 +232,9 @@ function handleKeyDown(e) {
       emit('select', { ...props.data[nextIndex], index: nextIndex })
       
       const itemBottom = (nextIndex + 1) * totalItemHeight.value
-      const scrollBottom = containerTop + containerHeight
+      const scrollBottom = (containerRef.value?.scrollTop || 0) + containerHeight.value
       if (itemBottom > scrollBottom && containerRef.value) {
-        containerRef.value.scrollTop = itemBottom - containerHeight
+        containerRef.value.scrollTop = itemBottom - containerHeight.value
       }
     }
     
@@ -197,7 +244,7 @@ function handleKeyDown(e) {
   }
 }
 
-// 确保选中项可见
+// 确保选项可见
 function ensureSelectedItemVisible() {
   if (!containerRef.value) return
   
@@ -259,6 +306,9 @@ onBeforeUnmount(() => {
   if (keyboardTimer) {
     clearTimeout(keyboardTimer)
   }
+  if (hoverTimer) {
+    clearTimeout(hoverTimer)
+  }
 })
 
 </script>