✨ feat(im): 优化 ResizableAside.vue 组件

src/views/im/home/components/ResizableAside.vue

@@ -0,0 +1,112 @@
+<template>
+  <!--
+    可拖拽宽度的左侧 Aside
+    - 使用 localStorage 记住用户上次调整的宽度（storageKey 必填）
+    - 拖拽区在右边缘，鼠标变 col-resize
+  -->
+  <aside
+    class="relative flex flex-col shrink-0 bg-[var(--el-bg-color)] border-r border-[var(--el-border-color-lighter)] shadow-[2px_0_8px_rgba(0,0,0,0.05)]"
+    :style="{ width: asideWidth + 'px' }"
+  >
+    <slot></slot>
+    <div
+      class="im-resizable-aside__handle absolute top-0 right--0.75 z-10 flex items-center justify-center w-1.5 h-full cursor-col-resize transition-colors"
+      :class="{ 'is-resizing': isResizing }"
+      title="拖拽调整宽度"
+      @mousedown="startResize"
+    >
+      <div class="im-resizable-aside__line w-0.5 h-full rounded-0.5 bg-transparent transition-all"></div>
+    </div>
+  </aside>
+</template>
+
+<script lang="ts" setup>
+import { onMounted, onBeforeUnmount, ref } from 'vue'
+
+defineOptions({ name: 'ImResizableAside' })
+
+const props = withDefaults(
+  defineProps<{
+    defaultWidth?: number // 默认宽度
+    minWidth?: number // 最小宽度
+    maxWidth?: number // 最大宽度
+    storageKey: string // localStorage 存储 key，必填；调用方通过 StorageKeys.asideWidth(page) 生成
+  }>(),
+  {
+    defaultWidth: 260,
+    minWidth: 200,
+    maxWidth: 500
+  }
+)
+
+const asideWidth = ref<number>(props.defaultWidth)
+const isResizing = ref(false)
+let startX = 0
+let startWidth = 0
+
+onMounted(() => {
+  const saved = localStorage.getItem(props.storageKey)
+  if (saved) {
+    const w = parseInt(saved, 10)
+    if (!Number.isNaN(w)) {
+      asideWidth.value = clamp(w)
+    }
+  }
+  document.addEventListener('mousemove', handleResize)
+  document.addEventListener('mouseup', stopResize)
+})
+
+onBeforeUnmount(() => {
+  // 拖拽中卸载：复用 stopResize 复位 body cursor/userSelect 并写回当前宽度，避免全局状态泄漏
+  if (isResizing.value) {
+    stopResize()
+  }
+  document.removeEventListener('mousemove', handleResize)
+  document.removeEventListener('mouseup', stopResize)
+})
+
+/** 把宽度夹到 [minWidth, maxWidth] 区间，恢复 / 拖拽路径都走它兜底 */
+function clamp(w: number) {
+  return Math.max(props.minWidth, Math.min(props.maxWidth, w))
+}
+
+/** 按下拖拽手柄：记录起始位置 + 锁定 body cursor/userSelect，避免拖拽中误选文本 */
+function startResize(e: MouseEvent) {
+  isResizing.value = true
+  startX = e.clientX
+  startWidth = asideWidth.value
+  document.body.style.cursor = 'col-resize'
+  document.body.style.userSelect = 'none'
+  e.preventDefault()
+}
+
+/** 拖拽中：按鼠标位移计算新宽度并 clamp 到允许区间 */
+function handleResize(e: MouseEvent) {
+  if (!isResizing.value) {
+    return
+  }
+  const deltaX = e.clientX - startX
+  asideWidth.value = clamp(startWidth + deltaX)
+}
+
+/** 松开鼠标：解锁 body 全局态并把当前宽度写入 localStorage 持久化 */
+function stopResize() {
+  if (!isResizing.value) {
+    return
+  }
+  isResizing.value = false
+  document.body.style.cursor = ''
+  document.body.style.userSelect = ''
+  localStorage.setItem(props.storageKey, String(asideWidth.value))
+}
+</script>
+
+<style scoped>
+/* 拖拽手柄的 hover / 拖拽中变色：UnoCSS 同时控制"handle 状态 → 子 line 样式"的选择器链比较绕，
+   用 scoped CSS 直接描述更清晰 */
+.im-resizable-aside__handle:hover .im-resizable-aside__line,
+.im-resizable-aside__handle.is-resizing .im-resizable-aside__line {
+  width: 3px;
+  background-color: #d0d4db;
+}
+</style>