{
  "slug": "activity-feed",
  "schemaVersion": 2,
  "sourceKind": "structured-spec",
  "confidence": "high",
  "implementation": "workbench.css",
  "behavior": "workbench.js",
  "preview": "preview/workbench-detail.html",
  "intent": "记录动态：事件行、评论块、评论框，按时间正序",
  "specification": "WORKBENCH.md §11.5",
  "reference": "examples/record-detail.html",
  "api": "initComposer(form, { onSubmit(text) → boolean | Promise<boolean> })",
  "variantDimensions": [
    {
      "axis": "item",
      "values": [
        "event",
        "comment"
      ]
    }
  ],
  "anatomy": {
    "parts": [
      "event",
      "event-icon",
      "comment",
      "comment-head",
      "composer",
      "send"
    ],
    "required": [
      "event",
      "composer"
    ]
  },
  "markup": {
    "event": "<div class=\"wb-activity-event\"><span class=\"wb-activity-icon\">[图标]</span><span><strong>林悦</strong> 把阶段改为「方案评估」</span><span class=\"wb-activity-time\">· 09-27</span></div>",
    "comment": "<article class=\"wb-comment\"><div class=\"wb-comment-head\"><span class=\"wb-avatar-xs\">林</span><strong>林悦</strong><span>09-27</span></div><p>…</p></article>",
    "composer": "<form class=\"wb-composer\"><textarea aria-label=\"评论内容\"></textarea><div class=\"wb-composer-foot\"><span>⌘ / Ctrl + Enter 发送</span><button type=\"submit\" class=\"wb-btn sm primary\">发送</button></div></form>"
  },
  "rules": [
    "按时间正序，最新在底部，紧挨评论框",
    "事件：20px 圆形图标底 + 操作人（墨色 500）+ 描述 + 时间，整行次级文字色",
    "评论：次级底色块，圆角 8px，内边距 12px，无边框",
    "评论框：⌘ / Ctrl + Enter 或发送按钮提交，Enter 换行；空内容不可发送；组字时不提交；失败保留内容"
  ],
  "states": [
    "empty",
    "typing",
    "sending",
    "sent",
    "error"
  ],
  "keyboard": [
    "⌘ / Ctrl + Enter 发送",
    "Enter 换行"
  ],
  "accessibility": [
    "动态区 role=\"log\" aria-live=\"polite\"",
    "提交期间 aria-busy"
  ],
  "doNotInvent": [
    "带边框阴影的评论卡片",
    "倒序时间线把评论框放在顶部"
  ]
}