# 版本更新代码对比分析

## 📋 代码差异对比

### 原始版本（cc50de0）- ✅ 正常显示进度

#### 状态定义
```typescript
// ✅ 所有状态都是组件内的 ref
const downloading = ref(false)
const installing = ref(false)
const downloadProgress = ref(0)
const downloadStatus = ref('active')

// ✅ progressInfo 是 ref，包含嵌套对象
const progressInfo = ref({
  progress: 0,
  speed: 0,
  downloaded: 0,
  total: 0
})
```

#### 下载函数
```typescript
const handleDownload = async () => {
  if (!updateInfo.value?.download_url) {
    Message.warning('下载地址不存在')
    return
  }

  // ✅ 直接设置组件状态
  downloading.value = true
  downloadProgress.value = 0
  downloadStatus.value = 'active'
  progressInfo.value = { progress: 0, speed: 0, downloaded: 0, total: 0 }
  installResult.value = null

  try {
    const result = await window.go.main.App.DownloadUpdate(updateInfo.value.download_url)
    if (result.success) {
      Message.success('下载请求已发送')
    }
  } catch (error) {
    console.error('下载失败:', error)
    downloadStatus.value = 'exception'
    downloading.value = false
  }
}
```

#### 事件监听
```typescript
// ✅ 在组件内监听事件
const onDownloadProgress = (event) => {
  const data = parseEventData(event)
  progressInfo.value = {  // ✅ 直接修改 ref
    progress: data.progress || 0,
    speed: data.speed || 0,
    downloaded: data.downloaded || 0,
    total: data.total || 0
  }
  downloadProgress.value = Math.round(data.progress || 0)
}

onMounted(async () => {
  await loadCurrentVersion()
  await loadConfig()

  // ✅ 直接监听事件
  window.EventsOn('download-progress', onDownloadProgress)
  window.EventsOn('download-complete', onDownloadComplete)
})
```

---

### 当前版本（HEAD）- ❌ 不显示进度

#### 状态定义
```typescript
// ✅ 使用 storeToRefs 从 store 解构
import { storeToRefs } from 'pinia'
import { useUpdateStore } from '../stores/update'

const updateStore = useUpdateStore()
const { checking, downloading, installing, downloadProgress, downloadStatus, progressInfo, updateInfo } = storeToRefs(updateStore)

// ❌ 问题：progressInfo 在 store 中是 reactive，不是 ref
// store.ts 定义：
// const progressInfo = reactive({
//   speed: 0,
//   downloaded: 0,
//   total: 0
// })
```

#### 下载函数
```typescript
const handleDownload = async () => {
  // ❌ 不再直接设置状态，而是调用 store 方法
  updateStore.downloadUpdate()
}
```

#### Store 中的下载函数
```typescript
// stores/update.ts
const downloadUpdate = async () => {
  const url = updateInfo.value?.download_url
  if (!url) {
    Message.warning('下载地址不存在')
    return
  }

  // ✅ 设置 store 状态
  downloading.value = true
  downloadProgress.value = 0
  downloadStatus.value = 'active'
  Object.assign(progressInfo, { speed: 0, downloaded: 0, total: 0 })  // ❌ Object.assign 对 reactive 对象的修改

  try {
    const result = await window.go.main.App.DownloadUpdate(url)
    if (result.success) {
      Message.success('下载请求已发送')
    }
  } catch (error) {
    downloadStatus.value = 'exception'
    downloading.value = false
  }
}
```

#### 事件监听
```typescript
// ❌ 在 App.vue 中注册事件（store 的方法）
// App.vue onMounted:
updateStore.setupEventListeners()

// stores/update.ts:
const setupEventListeners = () => {
  window.runtime.EventsOn('download-progress', onDownloadProgress)
  window.runtime.EventsOn('download-complete', onDownloadComplete)
}

// ❌ UpdatePanel 不再监听 download-progress（只监听 download-complete）
```

---

## 🔍 问题根因分析

### 核心问题

**storeToRefs 解构 reactive 对象的响应性问题**

在 Pinia store 中：
```typescript
const progressInfo = reactive({
  speed: 0,
  downloaded: 0,
  total: 0
})
```

使用 `storeToRefs` 解构后：
```typescript
const { progressInfo } = storeToRefs(updateStore)
// progressInfo 现在是一个 Ref<Reactive<...>>
```

**但是**：`Object.assign(progressInfo, { ... })` 修改 reactive 对象时，可能不会触发 Vue 的响应式更新！

### 响应性链路断裂

```
原始版本：
后端事件 → onDownloadProgress → progressInfo.value = {...}  → ✅ 触发更新

当前版本：
后端事件 → store.onDownloadProgress → Object.assign(progressInfo, {...}) → ❌ 不触发更新
```

---

## ✅ 解决方案

### 方案 1：保持 progressInfo 为 ref（推荐）

修改 store 定义：
```typescript
// stores/update.ts
const progressInfo = ref({
  speed: 0,
  downloaded: 0,
  total: 0
})

// 更新时：
const onDownloadProgress = (event: unknown) => {
  const data = parseEventData(event)
  progressInfo.value = {  // ✅ 直接替换整个对象
    speed: data.speed || 0,
    downloaded: data.downloaded || 0,
    total: data.total || 0
  }
}
```

### 方案 2：使用 ref 包装 reactive

```typescript
// stores/update.ts
const progressInfoState = reactive({
  speed: 0,
  downloaded: 0,
  total: 0
})
const progressInfo = ref(progressInfoState)

// 更新时：
Object.assign(progressInfoState, { ... })
```

### 方案 3：不使用 storeToRefs，直接访问 store

```typescript
// UpdatePanel.vue
const updateStore = useUpdateStore()

// 模板中直接使用
updateStore.progressInfo.speed
updateStore.progressInfo.downloaded
```

---

## 🎯 推荐修复

**采用方案 1**：将 progressInfo 改为 ref

### 修改 stores/update.ts
```typescript
// ❌ 修改前
const progressInfo = reactive({
  speed: 0,
  downloaded: 0,
  total: 0
})

// ✅ 修改后
const progressInfo = ref({
  speed: 0,
  downloaded: 0,
  total: 0
})
```

### 修改 onDownloadProgress
```typescript
// ❌ 修改前
Object.assign(progressInfo, {
  speed: (data.speed as number) || 0,
  downloaded: (data.downloaded as number) || 0,
  total: (data.total as number) || 0
})

// ✅ 修改后
progressInfo.value = {
  speed: (data.speed as number) || 0,
  downloaded: (data.downloaded as number) || 0,
  total: (data.total as number) || 0
}
```

### 修改 onDownloadComplete
```typescript
// ❌ 修改前
downloadProgress.value = 100
progressInfo.downloaded = (data.file_size as number) || 0
progressInfo.total = (data.file_size as number) || 0

// ✅ 修改后
downloadProgress.value = 100
progressInfo.value = {
  speed: 0,
  downloaded: (data.file_size as number) || 0,
  total: (data.file_size as number) || 0
}
```

---

## 📊 对比总结

| 项目 | 原始版本 | 当前版本 | 推荐方案 |
|------|---------|---------|---------|
| progressInfo 类型 | `ref({...})` | `reactive({...})` | `ref({...})` |
| 更新方式 | `progressInfo.value = {...}` | `Object.assign(progressInfo, {...})` | `progressInfo.value = {...}` |
| 事件监听 | 组件内监听 | store 监听 | store 监听 |
| 响应性 | ✅ 正常 | ❌ 断裂 | ✅ 正常 |

---

## 🔧 立即修复

需要修改 3 个地方：

1. **stores/update.ts** - progressInfo 改为 ref
2. **stores/update.ts** - 更新 onDownloadProgress
3. **stores/update.ts** - 更新 onDownloadComplete

这样可以保持 store 架构的同时，恢复响应性。
