{
  "schemaVersion": 1,
  "sourceKind": "authored-spec",
  "provenance": "authored-in-repo",
  "specFile": "spec/移动端规格.md",
  "specSection": "43 · 选择器 Picker",
  "confidence": "high",
  "slug": "mobile-picker",
  "name": "选择器 Picker",
  "semanticTypeCandidates": [
    "picker",
    "select",
    "wheel"
  ],
  "variantDimensions": [
    {
      "name": "mode",
      "values": [
        "single",
        "multiple"
      ]
    },
    {
      "name": "round",
      "values": [
        "false",
        "true"
      ]
    }
  ],
  "representativeVariants": [
    {
      "mode": "single",
      "round": "true",
      "label": "单列滚轮（城市这类单值选择）"
    },
    {
      "mode": "multiple",
      "round": "true",
      "label": "多列滚轮（时 / 分两列各选一项）"
    },
    {
      "mode": "single",
      "round": "false",
      "label": "直角（不含圆角）"
    },
    {
      "mode": "single",
      "round": "true",
      "label": "禁用（整块置灰且不响应）"
    }
  ],
  "anatomy": {
    "mask": "遮罩，点击关闭（closeOnMask=false 时不关）",
    "picker": "底部浮层面板，role=dialog + aria-modal",
    "picker__header": "取消 / 标题 / 确定三格，标题元素由 aria-labelledby 指向",
    "picker__columns": "列容器，single 一列、multiple 多列等分",
    "picker__column": "单列，role=listbox + aria-label 说明这列在选什么，可滚动",
    "picker__option": "单个选项，role=option + aria-selected，行高不小于 44px"
  },
  "structurePatterns": {
    "mode": "single（单列滚轮）/ multiple（多列滚轮，各列独立选中）",
    "round": "false（直角）/ true（靠内容一侧切圆角）",
    "disabled": "false（可选）/ true（整块置灰且不响应）"
  },
  "usageHints": [
    "从一组有限且已知的选项里选出一项或几项（城市、分值、时间），是表单里下拉框在触屏上的形态",
    "可绑定到 Popup 的底部形态，但本组件自带遮罩与面板，不要在弹出层里再套一层",
    "遮罩点击关闭；closeOnMask=false 时不关闭",
    "选项行高不小于 44px，滚动容器 -webkit-overflow-scrolling: touch",
    "点击选项只改本列高亮，不改宿主的值；确认时才提交",
    "确定 / 取消按钮热区不小于 44px",
    "取消即返回：点取消或遮罩丢弃本次点选，宿主侧的值回到打开前的状态"
  ],
  "doNotInvent": [
    "选项数据源与联动规则（由宿主传入 columns，本组件不发明城市库或级联关系）",
    "滚轮惯性 / 吸附动画的物理参数",
    "搜索过滤与键盘输入定位（那是 Input / Search 的职责）",
    "多选（一次选多个值）——本组件是「多列各选一项」，不是「一列选多项」"
  ],
  "unknowns": [
    "面板最大高度是否应随列数增长（当前固定 max-height 一列 200px）",
    "是否要支持「不选」的空值项",
    "列数上限（当前实现不限制，但三列以上在 375px 宽度下每列会很窄）"
  ],
  "interaction": [
    "遮罩点击关闭；closeOnMask=false 时不关闭",
    "选项行高不小于 44px，滚动容器 -webkit-overflow-scrolling: touch",
    "点击选项只改本列高亮（同列其余项取消高亮），不改宿主的值；确认时才提交",
    "确定 / 取消按钮热区不小于 44px",
    "取消防返回：点取消或遮罩丢弃本次点选，宿主侧的值回到打开前的状态"
  ],
  "accessibility": [
    "浮层 role=\"dialog\" + aria-modal=\"true\"，标题元素 id 由 aria-labelledby 指向",
    "每列 role=\"listbox\" + aria-label，选项 role=\"option\" + aria-selected",
    "遮罩 aria-hidden=\"true\"（纯装饰，读屏不播报）",
    "选中值以文本呈现在标题里（不依赖视觉滚动位置），收起态写 aria-hidden=\"true\"",
    "禁用项写 aria-disabled=\"true\"，读屏播报不可用"
  ],
  "api": {
    "source": "implementation",
    "note": "props / events / slots 为 6 端实现的公共接口（说明文字取自规格对应小节）。字段名与各端源码逐名核对：node tools/verify-mobile-docs.mjs",
    "requiredNote": "「必传」按严格定义：实现里**没有默认值**时才为 Y（本门禁逐条核对 props 与各端源码的默认值，防止契约与实现脱节）。",
    "props": [
      {
        "name": "mode",
        "type": "'single' | 'multiple'",
        "default": "'single'",
        "desc": "变体 mode：single 单列滚轮，multiple 多列滚轮（规格 §43.3）",
        "required": false
      },
      {
        "name": "round",
        "type": "boolean",
        "default": "false",
        "desc": "变体 round：靠内容一侧是否切圆角（规格 §43.3）",
        "required": false
      },
      {
        "name": "open",
        "type": "boolean",
        "default": "false",
        "desc": "状态 open：浮层是否展开（规格 §43.4）",
        "required": false
      },
      {
        "name": "closeOnMask",
        "type": "boolean",
        "default": "true",
        "desc": "遮罩点击是否关闭（规格 §43.5）",
        "required": false
      },
      {
        "name": "value",
        "type": "Array<string>",
        "default": "[]",
        "desc": "当前选中值，按列顺序排列（单列时长度 1）；用于让选中项可见（规格 §43.6）",
        "required": false
      },
      {
        "name": "columns",
        "type": "Array<{ label: string, options: Array<string | { label: string, value: string, disabled?: boolean }> }>",
        "default": "[]",
        "desc": "列定义（宿主提供，本组件不发明选项数据源）（规格 §43.7）",
        "required": false
      },
      {
        "name": "disabled",
        "type": "boolean",
        "default": "false",
        "desc": "变体 disabled：整块置灰且不响应（规格 §43.4）",
        "required": false
      },
      {
        "name": "title",
        "type": "string",
        "default": "''",
        "desc": "面板标题（空串时用默认「选择」）（规格 §43.2 picker__header）",
        "required": false
      }
    ],
    "events": [
      {
        "name": "confirm",
        "params": "value: Array<string>",
        "desc": "点击确定时触发，回传各列当前选中值（规格 §43.5）"
      },
      {
        "name": "close",
        "params": "—",
        "desc": "点击取消或遮罩（closeOnMask=true 时）时触发（规格 §43.5）"
      }
    ],
    "slots": [
      {
        "name": "default",
        "desc": "自定义内容（追加在面板之前，常见用法是放触发器）"
      }
    ]
  },
  "variantClasses": {
    "mode": {
      "single": [
        ".kole-m-picker--single"
      ],
      "multiple": [
        ".kole-m-picker--multiple"
      ]
    },
    "round": {
      "false": [],
      "true": [
        ".kole-m-picker--round"
      ]
    }
  },
  "demos": [
    {
      "id": "single",
      "group": "01 组件类型",
      "title": "单列滚轮",
      "desc": "mode=single：点选项即高亮，选中项用品牌色并与 aria-selected 同步，不依赖视觉位置。",
      "variant": "mode=single"
    },
    {
      "id": "multiple",
      "group": "01 组件类型",
      "title": "多列滚轮",
      "desc": "mode=multiple：时 / 分两列各自独立选中，确认时一并回传。",
      "variant": "mode=multiple"
    },
    {
      "id": "selected",
      "group": "02 组件状态",
      "title": "选中态与禁用项",
      "desc": "选中用 is-selected + aria-selected 双通道；禁用项置灰并写 aria-disabled，点击不响应。",
      "variant": "状态 selected | disabled"
    },
    {
      "id": "closed",
      "group": "02 组件状态",
      "title": "收起态",
      "desc": "默认态：遮罩 pointer-events: none，点触发器才把浮层与遮罩一起拉开。",
      "variant": "状态 closed"
    }
  ],
  "related": [
    {
      "slug": "mobile-popup",
      "why": "通用弹出层；本组件就是底部浮层形态，不要在弹出层里再套一层选择器"
    },
    {
      "slug": "actionsheet",
      "why": "动作面板也是底部升起的选项列表，但面向「点一下即执行」，不区分确定 / 取消"
    },
    {
      "slug": "mobile-datepicker",
      "why": "同样是底部滚轮，但选项是年月日这类有历法语义的日期时才用它"
    },
    {
      "slug": "mobile-cascader",
      "why": "选项之间有层级联动（省 → 市 → 区）时用级联选择器，而不是自己拼多列"
    },
    {
      "slug": "mobile-input",
      "why": "选项数量不定或需要用户自由输入时用它，不要用选择器硬塞长列表"
    }
  ]
}