feat: 多图宫格气泡全量实现 (#36~#38)
- #36 ImageGridBubble: 2 列×116pt / 3 列×78pt, 3pt 间距, 8pt 外层/4pt 单格圆角, tap→ImageViewerPage - #37 ChatDisplayItem + _buildDisplayItems: 连续 typ=2 同 sendId Δt<5s 分组为宫格，iOS ChatView.buildDisplayItems parity - #38 SendImageUseCase.sendBatch: Future.wait 并行上传 → 顺序快速发送，ImagePickerSheet 改用 sendBatch Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
This commit is contained in:
pp-bot
144
Doc/image_grid_architecture.md
Normal file
144
Doc/image_grid_architecture.md
Normal file
@@ -0,0 +1,144 @@
|
||||
# 多图宫格气泡架构文档
|
||||
|
||||
对应 Gitea issues #36–#38
|
||||
|
||||
---
|
||||
|
||||
## 1. 背景与目标
|
||||
|
||||
iOS 老项目 (`ImageGridBubble.swift`, `ChatView.buildDisplayItems()`) 已实现：
|
||||
- 接收端：连续同发送者图片消息自动合并为宫格气泡
|
||||
- 发送端：多图并行上传 → 快速连续发送 → 满足宫格分组条件
|
||||
|
||||
Flutter 新项目补齐以下能力：
|
||||
|
||||
| 功能 | Issue | iOS 对应 |
|
||||
|------|-------|---------|
|
||||
| 宫格气泡展示 | #36 | `ImageGridBubble.swift` |
|
||||
| 消息分组逻辑 | #37 | `ChatView.buildDisplayItems()` |
|
||||
| 多图并行发送 | #38 | `PhotosPicker + parallel upload` |
|
||||
|
||||
---
|
||||
|
||||
## 2. 消息格式
|
||||
|
||||
多图不引入新的 typ。每张图片仍为独立的 **typ=2** 消息：
|
||||
|
||||
```json
|
||||
{"url":"Image/xxx.jpg","width":1024,"height":768}
|
||||
```
|
||||
|
||||
分组完全在 **客户端渲染层** 完成，服务端/DB 无感知。
|
||||
|
||||
---
|
||||
|
||||
## 3. 宫格布局规则（iOS 对齐）
|
||||
|
||||
| 图片数 | 列数 | 单格尺寸 | 间距 |
|
||||
|--------|------|----------|------|
|
||||
| 2 | 2 列 | 116 × 116 pt | 3 pt |
|
||||
| 3–9 | 3 列 | 78 × 78 pt | 3 pt |
|
||||
|
||||
- **外层圆角**：8 pt（ClipRRect）
|
||||
- **单格圆角**：4 pt
|
||||
- **最后一行靠左**：不足 3 格时用透明占位补齐（仅 3 列布局）
|
||||
- **总宽度**：2 列 = 235 pt；3 列 = 240 pt
|
||||
|
||||
---
|
||||
|
||||
## 4. 分组算法（iOS ChatView.buildDisplayItems 对齐）
|
||||
|
||||
```
|
||||
for i in msgs:
|
||||
if msgs[i].typ == 2:
|
||||
batch = [msgs[i]]
|
||||
j = i + 1
|
||||
while j < len(msgs) and len(batch) < 9:
|
||||
next = msgs[j]
|
||||
if next.typ == 2
|
||||
and next.sendId == batch[0].sendId
|
||||
and (next.sendTime - msgs[j-1].sendTime) < 5:
|
||||
batch.append(next)
|
||||
j++
|
||||
else:
|
||||
break
|
||||
if len(batch) >= 2:
|
||||
emit ChatDisplayItem(grid=batch)
|
||||
i = j
|
||||
continue
|
||||
emit ChatDisplayItem(single=msgs[i])
|
||||
i++
|
||||
```
|
||||
|
||||
关键规则：
|
||||
- 同一 `sendId`（不区分我发/他发）
|
||||
- 连续相邻消息时间差 < **5 秒**（不是与第一条比，是与前一条比）
|
||||
- 最多 **9 条** 一组，第 10 条另起新组
|
||||
- typ 不为 2 立即截断分组
|
||||
|
||||
---
|
||||
|
||||
## 5. 并行上传设计（#38）
|
||||
|
||||
```
|
||||
用户点击「发送」
|
||||
└─ SendImageUseCase.sendBatch(filePaths, chatId)
|
||||
├─ Future.wait([upload(img1), upload(img2), ..., upload(imgN)])
|
||||
│ └─ 每个 upload: readBytes → dart:ui.ImageDescriptor → UploadFileRequest → url
|
||||
└─ for url in results (顺序):
|
||||
└─ SendMessageUseCase.execute(chatId, jsonEncode({url,w,h}), typ=2)
|
||||
└─ 乐观写入 sendTime = now()（各条仅相差毫秒）
|
||||
```
|
||||
|
||||
**关键**：并行上传确保所有 `sendTime` 在同一时刻附近（< 1 秒差），
|
||||
满足分组条件（< 5 秒）。
|
||||
|
||||
---
|
||||
|
||||
## 6. 数据流：发送多图
|
||||
|
||||
```
|
||||
ImagePickerSheet._sendAll()
|
||||
└─ sendImageUseCaseProvider.sendBatch(filePaths, chatId)
|
||||
├─ 并行上传 → [(url1,w1,h1), (url2,w2,h2), ...]
|
||||
└─ 顺序发送 → [typ=2 msg1, typ=2 msg2, ...]
|
||||
└─ DB Stream → messagesByChatIdProvider
|
||||
└─ _buildDisplayItems()
|
||||
└─ [msg1, msg2] 同 sendId + typ=2 + Δt<5s
|
||||
└─ ChatDisplayItem(grid=[msg1, msg2])
|
||||
└─ ImageGridBubble(messages: [msg1, msg2])
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 7. 数据流：接收多图
|
||||
|
||||
```
|
||||
WS/HTTP → DB → messagesByChatIdProvider Stream
|
||||
└─ _buildDisplayItems(msgs)
|
||||
└─ 连续 typ=2 同 sendId Δt<5s → ChatDisplayItem(grid)
|
||||
└─ ImageGridBubble
|
||||
├─ GridCell(Image.network + ClipRRect 4pt)
|
||||
└─ onTap → ImageViewerPage.open(urls: allUrls, initialIndex: i)
|
||||
```
|
||||
|
||||
---
|
||||
|
||||
## 8. 新增/修改文件清单
|
||||
|
||||
| 文件 | 操作 | 说明 |
|
||||
|------|------|------|
|
||||
| `lib/features/chat/view/widgets/image_grid_bubble.dart` | 新增 | #36 宫格气泡组件 |
|
||||
| `lib/features/chat/view/chat_detail_page.dart` | 修改 | #37 ChatDisplayItem + buildDisplayItems |
|
||||
| `lib/features/chat/usecases/send_image_usecase.dart` | 修改 | #38 sendBatch() 并行上传 |
|
||||
| `lib/features/chat/view/widgets/image_picker_sheet.dart` | 修改 | #38 改用 sendBatch() |
|
||||
| `Doc/image_grid_architecture.md` | 新增 | 本文档 |
|
||||
|
||||
---
|
||||
|
||||
## 9. 待完成
|
||||
|
||||
- 图片 sticker (typ=5) 展示
|
||||
- GIF 消息 (typ=25) 支持（目前 typ=25 走 ImageMessageBubble，后续可合并入宫格分组）
|
||||
- 端到端加密图片（cipher_guard_sdk 接入后）
|
||||
- 宫格内视频支持（若后续 album 含 video）
|
||||
Reference in New Issue
Block a user