update at 2026-02-13 22:26:53
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APP_FLOW.md
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APP_FLOW.md
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# APP_FLOW.md
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## 1. Scope
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This file defines every user-visible flow for the current product scope.
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Primary web route is `/` (single-page app). Miniapp flow is skeleton-only.
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本文件定义当前版本所有用户可见流程,覆盖 Web 与小程序两端。
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Related docs:
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关联文档:
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- PRD.md
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- FRONTEND_GUIDELINES.md
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- BACKEND_STRUCTURE.md
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## 2. Screen List and Route Map
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- `Web /` : Main Sankey workspace (header + mapping panels + chart preview).
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- `Miniapp /pages/index/index` : Layout skeleton only (not full feature parity).
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## 2. 页面与路由清单
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- `Web /`:主工作区(顶部工具栏 + 数据选择器 + 信息日志 + 桑基图预览)
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- `Miniapp /pages/index/index`:小程序可用页(上传、映射、预览、导出)
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## 3. Web Flow: Initial Page Load
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Trigger:
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- User opens `/`.
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## 3. Web 流程:首次加载
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触发条件:
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- 用户打开 `/`
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Steps:
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1. Render header, mapping panels, and chart container.
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2. Initialize ECharts instance.
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3. Try loading `/data/example0.xlsx`.
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4. Parse file and set default column mapping.
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5. Build Sankey data and render preview.
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步骤:
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1. 渲染页面结构并初始化 ECharts
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2. 尝试读取 `/data/example0.xlsx`
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3. 解析文件并应用默认列映射
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4. 构建 Sankey 数据并渲染预览
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Decision points:
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- If sample file request fails, show parse error text and keep page interactive.
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决策点:
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- 若样例文件加载失败,显示错误信息,但页面仍可继续上传文件
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Success result:
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- User sees a chart without manual upload.
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成功结果:
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- 用户无需上传即可看到可操作示例图
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Error result:
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- User sees a clear message and can still upload a file manually.
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失败结果:
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- 页面给出明确错误提示,保持可恢复
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## 4. Web Flow: File Upload (Click)
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Trigger:
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- User clicks upload icon and selects a local file.
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## 4. Web 流程:文件上传(点击/拖拽)
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触发条件:
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- 点击上传并选择文件,或将文件拖入上传区
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Steps:
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1. Validate extension (`csv/xls/xlsx`).
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2. Parse file to `RawTable`.
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3. Reset default mapping by column count.
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4. Rebuild Sankey data via reactive effect.
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5. Update upload message with filename and row count.
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步骤:
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1. 校验后缀:`csv/xls/xlsx`
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2. 解析为 `RawTable`
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3. 应用默认映射或恢复持久化映射
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4. 重建聚合并刷新图表
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5. 更新上传提示文案(文件名 + 行数)
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Decision points:
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- Unsupported file type.
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- Parse failure (CSV parser/XLSX parser errors).
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决策点:
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- 不支持的后缀直接报错
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- 解析异常显示错误并保留上一次有效状态
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Success result:
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- Mapping list updates to current headers and preview updates.
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## 5. Web 流程:列映射与预览配置
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触发条件:
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- 用户修改数据列、描述列、方向、gap、padding、主题、汇聚对齐等配置
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Error result:
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- Error message appears; previous valid state remains usable.
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步骤:
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1. 更新映射或显示配置
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2. 触发重建逻辑
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3. 刷新图表与信息日志
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4. 持久化配置到 localStorage
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## 5. Web Flow: File Upload (Drag and Drop)
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Trigger:
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- User drops one file into upload area.
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决策点:
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- `source data` 未选:阻断构建并提示
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- `target description` 为空:阻断构建并提示
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- 非法数值/空描述:跳过行并写入告警
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Steps:
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1. Read first file from drop payload.
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2. Reuse the same pipeline as click upload.
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## 6. Web 流程:导出
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触发条件:
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- 点击导出 `SVG` 或 `PNG`
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Decision points:
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- No file in payload.
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步骤:
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1. 检查图表实例是否可用
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2. 组装时间戳文件名
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3. SVG:临时创建 SVG 渲染器导出
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4. PNG:`pixelRatio=2` 导出
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5. 触发浏览器下载
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Success and error behaviors:
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- Same as click upload.
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## 7. 小程序流程:文件上传与默认映射
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触发条件:
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- 用户点击“文件上传”
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## 6. Web Flow: Mapping Configuration
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Trigger:
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- User changes any mapping item in the left panels.
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步骤:
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1. 选择 `csv/xls/xlsx` 文件
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2. 按后缀分流解析:
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- `csv`:文本解析
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- `xls/xlsx`:SheetJS 解析首个工作表
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3. 应用默认映射规则
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4. 重建 Sankey 聚合并更新日志
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5. 触发 canvas 重绘
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Steps:
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1. Select one source data column (radio).
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2. Toggle source description columns (checkbox list).
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3. Toggle target description columns (checkbox list).
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4. Optional: toggle target total label display.
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5. Reactive builder recomputes links and warnings.
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决策点:
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- 若 xlsx 模块不可用,提示先在开发者工具执行“构建 npm”
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- 解析失败显示错误,不会导致页面失效
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Decision points:
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- Missing source data column -> block build with message.
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- Empty target description selection -> block build with message.
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- Invalid numeric source value -> row dropped with warning.
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- Empty source/target name after rules -> row dropped with warning.
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## 8. 小程序流程:列映射与预览
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触发条件:
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- 用户点击任意列项调整 source/target 映射
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Success result:
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- Chart updates immediately.
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步骤:
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1. 更新映射状态
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2. 调用聚合构建
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3. 更新统计(节点数、连线数、跳过行)
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4. 更新“信息日志”
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5. 重绘 canvas 预览
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Error result:
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- Build error or warning list shown in preview panel.
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## 9. 小程序流程:导出
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触发条件:
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- 点击导出 PNG 或 SVG
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## 7. Web Flow: Preview Controls
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Trigger:
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- User changes direction, gap, padding, or theme.
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步骤:
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1. PNG:
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- 将 canvas 导出临时图片
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- 保存到系统相册
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2. SVG:
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- 复用布局算法生成 SVG 字符串
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- 写入用户目录 `.svg` 文件
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- 优先尝试打开文档;若失败则复制文件路径
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Steps:
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1. Direction toggle swaps link direction (`source<->target`).
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2. Gap/padding sliders update chart series layout.
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3. Theme picker updates node palette.
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Decision points:
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- Theme popover closes on outside pointer down.
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Success result:
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- Chart visual changes apply in-place.
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## 8. Web Flow: Export
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Trigger:
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- User clicks `Export SVG` or `Export PNG`.
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Steps:
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1. Ensure chart instance exists.
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2. Build filename with timestamp.
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3. For SVG: prefer serializing DOM `<svg>`; fallback to `getDataURL`.
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4. For PNG: use `getDataURL(type='png', pixelRatio=2)`.
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5. Trigger browser download.
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Decision points:
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- No chart instance -> no action.
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Success result:
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- Downloaded file appears with expected naming.
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## 9. Miniapp Skeleton Flow (Current State)
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Trigger:
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- Open miniapp index page.
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Steps:
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1. Render static layout blocks.
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2. Allow opening/closing theme bottom sheet.
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Current limitations:
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- No real file parsing, no Sankey rendering, no export pipeline.
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决策点:
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- 无可用数据时阻断导出并提示
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- 相册权限不足时提示用户授权
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## 10. Flow Completion Checklist
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A flow is considered complete only when:
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1. Success path works end-to-end.
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2. Error path shows deterministic message.
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3. UI state remains recoverable after errors.
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流程视为完成需满足:
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1. 成功路径可端到端执行
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2. 失败路径有明确且可定位的错误信息
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3. 错误后页面仍可恢复继续操作
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