feat(ui): 底栏可拖动切换 + 透明度降至 0.24

- 滑块随手指实时移动，松手后跳转到目标 tab
- 抽出 tabBarGeometry 计算拖拽命中，配套单测
- 底栏浅色/深色底色 0.32 -> 0.24

dist/custom-tab-bar/index.js

@@ -1 +1 @@
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+"use strict";(wx["webpackJsonp"]=wx["webpackJsonp"]||[]).push([[777],{7914:function(n,e,t){var a=t(7842),c=t(5544),i=t(118),r=t(758),u=t.n(r),o=t(6540),s=t(1457),l=t(9703),f=t(6606),h=t(8199);function g(n,e,t){return Number.isFinite(n)?Math.min(t,Math.max(e,n)):e}function v(n,e){return g(n,0,Math.max(0,e))}function m(n,e,t){if(!Number.isFinite(n)||!Number.isFinite(e)||e<=0||t<=0)return 0;var a=v(n,e)/e;return g(Math.floor(a*t),0,t-1)}function p(n){var e=n/750;return{left:36*e,width:Math.max(0,n-72*e)}}var d=t(4848),b=[{pagePath:"/pages/index/index",label:"\u9996\u9875",icon:(0,h.uq)("/icon/\u9996\u9875.svg"),iconActive:(0,h.uq)("/icon/\u9996\u9875-fill.svg")},{pagePath:"/pages/shop/index",label:"\u5546\u54c1",icon:(0,h.uq)("/icon/\u5546\u54c1.svg"),iconActive:(0,h.uq)("/icon/\u5546\u54c1-fill.svg")},{pagePath:"/pages/designList/index",label:"\u8bbe\u8ba1\u6e05\u5355",icon:(0,h.uq)("/icon/\u8c03\u8272\u76d8.svg"),iconActive:(0,h.uq)("/icon/\u8c03\u8272\u76d8-fill.svg")},{pagePath:"/pages/orders/index",label:"\u8ba2\u5355",icon:(0,h.uq)("/icon/\u5305\u88f9.svg"),iconActive:(0,h.uq)("/icon/\u5305\u88f9-fill.svg")},{pagePath:"/pages/profile/index",label:"\u6211\u7684",icon:(0,h.uq)("/icon/\u4e2a\u4eba.svg"),iconActive:(0,h.uq)("/icon/\u4e2a\u4eba-fill.svg")}],x=100/b.length;function C(n){var e=b.findIndex(function(e){return n.endsWith(e.pagePath)});return b[e>=0?e:0].pagePath}function S(){var n=u().getCurrentInstance().router,e=n&&n.path?n.path:"pages/index/index";return C(e)}function N(){var n=(0,o.useState)((0,s.eW)((0,s.O4)())),e=(0,c.A)(n,2),t=e[0],a=e[1],r=(0,o.useState)(S),h=(0,c.A)(r,2),g=h[0],N=h[1],P=(0,o.useState)(null),q=(0,c.A)(P,2),w=q[0],j=q[1],A=(0,o.useRef)(null),T=(0,o.useRef)(null);(0,o.useEffect)(function(){var n=function(n){return a(n)};return u().eventCenter.on(l.Wo,n),function(){u().eventCenter.off(l.Wo,n)}},[]),(0,o.useEffect)(function(){var n=function(n){!n||"dark"!==n.theme&&"light"!==n.theme||((0,s.Rq)(n.theme),"auto"===(0,s.O4)()&&a(n.theme))},e=u();return e.onThemeChange&&e.onThemeChange(n),function(){e.offThemeChange&&e.offThemeChange(n)}},[]),(0,o.useEffect)(function(){var n=function(n){var e=u().getCurrentInstance().router,t=e&&e.path?e.path:"pages/index/index";N(C(n||t))};return u().eventCenter.on("tabBarChange",n),function(){u().eventCenter.off("tabBarChange",n)}},[]),(0,o.useEffect)(function(){(0,f.G)(t)},[t]);var M=function(n){N(C(n)),u().switchTab({url:n}),u().eventCenter.trigger("tabBarChange",n)},E=function(n){var e=n.touches&&n.touches[0];if(e){var t=p(u().getSystemInfoSync().windowWidth);T.current=t;var a=v(e.clientX-t.left,t.width);A.current=a,j(a)}},I=function(n){if(null!==A.current){var e=T.current,t=n.touches&&n.touches[0];if(e&&t){var a=v(t.clientX-e.left,e.width);A.current=a,j(a)}}},W=function(){var n=T.current,e=A.current;if(n&&null!==e){var t=m(e,n.width,b.length),a=b[t];a&&a.pagePath!==g&&M(a.pagePath)}T.current=null,A.current=null,j(null)},F=function(){T.current=null,A.current=null,j(null)},O=Math.max(0,b.findIndex(function(n){return n.pagePath===g}));return(0,d.jsxs)(i.Ss,{className:"tab-bar-root theme-".concat(t),children:[(0,d.jsx)(i.Ss,{className:"tab-bar-gradient"}),(0,d.jsxs)(i.Ss,{className:"custom-tab-bar theme-".concat(t),onTouchStart:E,onTouchMove:I,onTouchEnd:W,onTouchCancel:F,catchMove:!0,children:[(0,d.jsx)(i.Ss,{className:"tab-bar-caustic"}),(0,d.jsx)(i.Ss,{className:"tab-bar-rim"}),(0,d.jsx)(i.Ss,{className:"tab-indicator ".concat(null!==w?"dragging":""),style:{left:null===w?"calc(".concat((O+.5)*x,"%)"):"".concat(w,"px")}}),b.map(function(n){var e=n.pagePath===g;return(0,d.jsxs)(i.Ss,{className:"tab-item ".concat(e?"active":""),children:[(0,d.jsx)(i._V,{className:"tab-icon-img ".concat(e?"active":""),src:e?n.iconActive:n.icon,mode:"aspectFit"}),(0,d.jsx)(i.EY,{className:"tab-label",children:n.label})]},n.pagePath)})]})]})}Component((0,a.createComponentConfig)(N,"custom-tab-bar/index"))}},function(n){var e=function(e){return n(n.s=e)};n.O(0,[907,96,76],function(){return e(7914)});n.O()}]);

src/custom-tab-bar/index.scss

@@ -33,7 +33,7 @@
   height: 116rpx;
   box-sizing: border-box;
   overflow: hidden;
-  background: rgba(255, 255, 255, 0.32);
+  background: rgba(255, 255, 255, 0.24);
   backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   -webkit-backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   display: flex;
@@ -50,7 +50,7 @@
 
 /* 自定义组件样式隔离：两套主题配色在组件内自包含，不依赖全局 app.wxss */
 .custom-tab-bar.theme-dark {
-  background: rgba(25, 25, 25, 0.32);
+  background: rgba(25, 25, 25, 0.24);
   backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   -webkit-backdrop-filter: blur(32px) saturate(1.7) brightness(1.05);
   border-color: rgba(255, 255, 255, 0.1);
@@ -127,12 +127,14 @@
 
 .tab-indicator {
   position: absolute;
-  left: 50%;
   transform: translateX(-50%);
   bottom: 6rpx;
   width: 120rpx;
   height: 100rpx;
   border-radius: 50rpx;
+  pointer-events: none;
+  z-index: 4;
+  transition: left 0.25s ease;
   background: linear-gradient(180deg, rgba(0, 0, 0, 0.1), rgba(0, 0, 0, 0.16));
   border: 1rpx solid rgba(255, 255, 255, 0.25);
   box-shadow:
@@ -150,6 +152,10 @@
     0 4rpx 10rpx rgba(0, 0, 0, 0.2);
 }
 
+.tab-indicator.dragging {
+  transition: none;
+}
+
 .tab-icon-img {
   position: relative;
   z-index: 1;

src/custom-tab-bar/index.tsx

@@ -1,10 +1,11 @@
 import { View, Text, Image } from '@tarojs/components'
 import Taro from '@tarojs/taro'
-import { useEffect, useState } from 'react'
+import { useEffect, useRef, useState } from 'react'
 import { getTheme, resolveTheme, setDetectedSystemTheme } from '../utils/store'
 import { THEME_CHANGE_EVENT } from '../context/ThemeContext'
 import { applyPageBackground } from '../utils/themeBackground'
 import { assetUrl } from '../utils/asset'
+import { clampDragX, getTabBarFrame, tabIndexAtX } from './tabBarGeometry'
 import './index.scss'
 
 const TABS = [
@@ -15,6 +16,8 @@ const TABS = [
   { pagePath: '/pages/profile/index', label: '我的', icon: assetUrl('/icon/个人.svg'), iconActive: assetUrl('/icon/个人-fill.svg') }
 ]
 
+const TAB_CENTER_STEP = 100 / TABS.length
+
 function matchTab(path: string): string {
   const idx = TABS.findIndex((t) => path.endsWith(t.pagePath))
   return TABS[idx >= 0 ? idx : 0].pagePath
@@ -36,6 +39,9 @@ export default function CustomTabBar() {
 
   // 微信自定义 tabBar 不会自动感知 page 路由变化，用 state 保持选中态响应式
   const [activeTab, setActiveTab] = useState<string>(currentTabPath)
+  const [dragX, setDragX] = useState<number | null>(null)
+  const dragXRef = useRef<number | null>(null)
+  const barFrameRef = useRef<{ left: number; width: number } | null>(null)
 
   useEffect(() => {
     const handler = (t: 'light' | 'dark') => setResolvedTheme(t)
@@ -91,21 +97,68 @@ export default function CustomTabBar() {
     Taro.eventCenter.trigger('tabBarChange', url)
   }
 
+  const startDrag = (e: any) => {
+    const touch = e.touches && e.touches[0]
+    if (!touch) return
+    const frame = getTabBarFrame(Taro.getSystemInfoSync().windowWidth)
+    barFrameRef.current = frame
+    const nextX = clampDragX(touch.clientX - frame.left, frame.width)
+    dragXRef.current = nextX
+    setDragX(nextX)
+  }
+
+  const moveDrag = (e: any) => {
+    if (dragXRef.current === null) return
+    const frame = barFrameRef.current
+    const touch = e.touches && e.touches[0]
+    if (!frame || !touch) return
+    const nextX = clampDragX(touch.clientX - frame.left, frame.width)
+    dragXRef.current = nextX
+    setDragX(nextX)
+  }
+
+  const endDrag = () => {
+    const frame = barFrameRef.current
+    const x = dragXRef.current
+    if (frame && x !== null) {
+      const idx = tabIndexAtX(x, frame.width, TABS.length)
+      const target = TABS[idx]
+      if (target && target.pagePath !== activeTab) switchTab(target.pagePath)
+    }
+    barFrameRef.current = null
+    dragXRef.current = null
+    setDragX(null)
+  }
+
+  const cancelDrag = () => {
+    barFrameRef.current = null
+    dragXRef.current = null
+    setDragX(null)
+  }
+
+  const activeIndex = Math.max(0, TABS.findIndex((t) => t.pagePath === activeTab))
+
   return (
     <View className={`tab-bar-root theme-${resolvedTheme}`}>
       <View className='tab-bar-gradient' />
-      <View className={`custom-tab-bar theme-${resolvedTheme}`}>
+      <View
+        className={`custom-tab-bar theme-${resolvedTheme}`}
+        onTouchStart={startDrag}
+        onTouchMove={moveDrag}
+        onTouchEnd={endDrag}
+        onTouchCancel={cancelDrag}
+        catchMove
+      >
         <View className='tab-bar-caustic' />
         <View className='tab-bar-rim' />
+        <View
+          className={`tab-indicator ${dragX !== null ? 'dragging' : ''}`}
+          style={{ left: dragX === null ? `calc(${(activeIndex + 0.5) * TAB_CENTER_STEP}%)` : `${dragX}px` }}
+        />
         {TABS.map((tab) => {
           const isActive = tab.pagePath === activeTab
           return (
-            <View
-              key={tab.pagePath}
-              className={`tab-item ${isActive ? 'active' : ''}`}
-              onTap={() => switchTab(tab.pagePath)}
-            >
-              {isActive && <View className='tab-indicator' />}
+            <View key={tab.pagePath} className={`tab-item ${isActive ? 'active' : ''}`}>
               <Image className={`tab-icon-img ${isActive ? 'active' : ''}`} src={isActive ? tab.iconActive : tab.icon} mode='aspectFit' />
               <Text className='tab-label'>{tab.label}</Text>
             </View>

src/custom-tab-bar/tabBarGeometry.js

@@ -0,0 +1,21 @@
+export function clamp(value, min, max) {
+  if (!Number.isFinite(value)) return min
+  return Math.min(max, Math.max(min, value))
+}
+
+export function clampDragX(x, barWidth) {
+  return clamp(x, 0, Math.max(0, barWidth))
+}
+
+export function tabIndexAtX(x, barWidth, tabCount) {
+  if (!Number.isFinite(x) || !Number.isFinite(barWidth) || barWidth <= 0 || tabCount <= 0) {
+    return 0
+  }
+  const ratio = clampDragX(x, barWidth) / barWidth
+  return clamp(Math.floor(ratio * tabCount), 0, tabCount - 1)
+}
+
+export function getTabBarFrame(windowWidth) {
+  const rpx = windowWidth / 750
+  return { left: 36 * rpx, width: Math.max(0, windowWidth - 72 * rpx) }
+}

tools/custom-tab-bar.test.mjs

@@ -0,0 +1,24 @@
+import test from 'node:test'
+import assert from 'node:assert/strict'
+import { clampDragX, getTabBarFrame, tabIndexAtX } from '../src/custom-tab-bar/tabBarGeometry.js'
+
+test('maps a drag x to the tab under the finger', () => {
+  assert.equal(tabIndexAtX(10, 100, 5), 0)
+  assert.equal(tabIndexAtX(30, 100, 5), 1)
+  assert.equal(tabIndexAtX(50, 100, 5), 2)
+  assert.equal(tabIndexAtX(70, 100, 5), 3)
+  assert.equal(tabIndexAtX(90, 100, 5), 4)
+})
+
+test('clamps drag positions outside the bar', () => {
+  assert.equal(tabIndexAtX(-10, 100, 5), 0)
+  assert.equal(tabIndexAtX(200, 100, 5), 4)
+  assert.equal(clampDragX(-5, 100), 0)
+  assert.equal(clampDragX(120, 100), 100)
+  assert.equal(clampDragX(Number.NaN, 100), 0)
+})
+
+test('derives the floating bar frame from window width', () => {
+  assert.deepEqual(getTabBarFrame(375), { left: 18, width: 339 })
+  assert.deepEqual(getTabBarFrame(750), { left: 36, width: 678 })
+})

tools/liquid-glass.test.mjs

@@ -15,8 +15,8 @@ test('custom tab bar renders the liquid-glass overlay layers', () => {
 
 test('custom tab bar uses bright glass material and the silver rim', () => {
   const css = read('src/custom-tab-bar/index.scss')
-  assert.match(css, /background: rgba\(255, 255, 255, 0\.32\)/)
-  assert.match(css, /background: rgba\(25, 25, 25, 0\.32\)/)
+  assert.match(css, /background: rgba\(255, 255, 255, 0\.24\)/)
+  assert.match(css, /background: rgba\(25, 25, 25, 0\.24\)/)
   assert.match(css, /backdrop-filter: blur\(32px\) saturate\(1\.7\) brightness\(1\.05\)/)
   assert.match(css, /-webkit-backdrop-filter: blur\(32px\) saturate\(1\.7\) brightness\(1\.05\)/)
   assert.match(css, /mask-composite: exclude/)