{
  "schemaVersion": 1,
  "sourceKind": "authored-spec",
  "provenance": "authored-in-repo",
  "specFile": "spec/移动端规格.md",
  "specSection": "35 · 滑动选择器 Slider",
  "confidence": "high",
  "slug": "mobile-slider",
  "name": "滑动选择器 Slider",
  "semanticTypeCandidates": [
    "slider",
    "range-slider",
    "gesture-input"
  ],
  "variantDimensions": [
    {
      "name": "mode",
      "values": [
        "single",
        "range"
      ]
    },
    {
      "name": "marks",
      "values": [
        "with-marks",
        "none"
      ]
    },
    {
      "name": "showValue",
      "values": [
        "true",
        "false"
      ]
    }
  ],
  "representativeVariants": [
    {
      "mode": "single",
      "marks": "none",
      "showValue": "true",
      "label": "默认（单滑块 + 右侧数值）"
    },
    {
      "mode": "single",
      "marks": "with-marks",
      "showValue": "true",
      "label": "带刻度（轨道上标出等分点）"
    },
    {
      "mode": "range",
      "marks": "none",
      "showValue": "true",
      "label": "双滑块区间（左值不越过右值）"
    }
  ],
  "anatomy": {
    "slider": "根元素，一行里放进「轨道热区 + 数值」",
    "rail": "轨道热区，44px 高的可聚焦区域，承载指针事件与锚点",
    "track": "轨道本体（可视 4px），承载选中段与刻度的边界",
    "filled": "选中段，从起点铺到滑块位置",
    "thumb": "滑块，位置由当前值的百分比决定；拖动中放大作为「抓住了」的反馈",
    "mark": "刻度点，仅 marks=with-marks 时出现（只标位置，不写文案）"
  },
  "structurePatterns": {
    "mode": "single（单滑块）/ range（双滑块，左值不越过右值）",
    "marks": "with-marks（轨道上标出等分点）/ none（不标刻度）",
    "showValue": "true（右侧显示当前值）/ false（不显示数值）"
  },
  "usageHints": [
    "在一个连续区间里用一次滑动选出数值（预算上限、价格区间、音量、亮度）",
    "轨道可视高度只有 4px，但整条轨道所在的行必须是 44px 高的热区",
    "按下任意位置就要跳到该处 —— 触屏上要求用户精确抓住 20px 的滑块是点不中的",
    "取值按 step 吸附并夹在 [min, max]；mode=range 时左值不越过右值、右值不越过左值",
    "值变化立即触发 change 事件（连续回传），不做防抖；松手时才做业务提交"
  ],
  "doNotInvent": [
    "数值输入框与滑块的双向绑定（宿主自行组合 Input，本组件只回传值）",
    "刻度上的文案标注与区间高亮（只标位置，不写文案）",
    "拖动结束后的「撤销 / 重置」流程",
    "纵向滑块与圆形表盘式选择器"
  ],
  "unknowns": [
    "双滑块的最小间距是否应当是 1 个 step（当前是），还是用户可配",
    "刻度数量是否应由 step 推导（当前按 5 等分固定标点）",
    "拖动中是否要把当前值放大显示在滑块上方（气泡提示）"
  ],
  "interaction": [
    "轨道热区高 44px，**按下任意位置即跳到该处**，随后横向拖动连续改值；不要求抓住滑块",
    "手势是「按下 + 拖动」一次连续动作，不响应长按或双击；横向分量优先，纵向滚动不被吞掉（touch-action: pan-y）",
    "取值按 step 吸附并夹在 [min, max]；mode=range 时左值不越过右值、右值不越过左值",
    "拖动期间滑块放大到 24px，松手后 150ms 回弹；减少动态偏好下瞬时切换",
    "值变化立即触发 change 事件（连续回传），不做防抖；松手时才做业务提交"
  ],
  "accessibility": [
    "单滑块：轨道热区是 role=\"slider\" 且可聚焦，写 aria-valuemin / aria-valuemax / aria-valuenow / aria-label",
    "双滑块：外层是 role=\"group\" + aria-label，每个滑块各自持有 aria-valuenow（两条独立数值）",
    "禁用时写 aria-disabled=\"true\"，读屏会播报不可用",
    "键盘：聚焦后左右方向键按 step 步进（触屏之外的替代路径）"
  ],
  "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": "value",
        "type": "number",
        "default": "0",
        "desc": "受控当前值（range 模式下是左值），与 aria-valuenow 同步写（规格 §35.5）",
        "required": false
      },
      {
        "name": "valueMax",
        "type": "number",
        "default": "100",
        "desc": "mode=range 时的右值（single 模式忽略）（规格 §35.3）",
        "required": false
      },
      {
        "name": "min",
        "type": "number",
        "default": "0",
        "desc": "区间下限，拖动与键盘步进都不会低于它（规格 §35.5）",
        "required": false
      },
      {
        "name": "max",
        "type": "number",
        "default": "100",
        "desc": "区间上限，拖动与键盘步进都不会高于它（规格 §35.5）",
        "required": false
      },
      {
        "name": "step",
        "type": "number",
        "default": "1",
        "desc": "取值吸附步长；也是双滑块的最小间距与键盘步进量（规格 §35.5）",
        "required": false
      },
      {
        "name": "mode",
        "type": "'single' | 'range'",
        "default": "'single'",
        "desc": "变体 mode：单滑块还是双滑块区间（规格 §35.3）",
        "required": false
      },
      {
        "name": "marks",
        "type": "boolean",
        "default": "false",
        "desc": "变体 marks：轨道上是否标出等分刻度点（规格 §35.3）",
        "required": false
      },
      {
        "name": "showValue",
        "type": "boolean",
        "default": "true",
        "desc": "变体 showValue：是否在轨道右侧显示当前值（规格 §35.3）",
        "required": false
      },
      {
        "name": "disabled",
        "type": "boolean",
        "default": "false",
        "desc": "状态 disabled：整条置灰且不响应，指针与键盘都不改值（规格 §35.4）",
        "required": false
      },
      {
        "name": "label",
        "type": "string",
        "default": "'滑动选择'",
        "desc": "无障碍名称，落到 role=\"slider\" 的 aria-label（规格 §35.6）",
        "required": false
      }
    ],
    "events": [
      {
        "name": "change",
        "params": "(value)",
        "desc": "拖动或键盘步进改值时触发，连续回传当前值（range 模式回传 [左值, 右值]）（规格 §35.5）"
      }
    ],
    "slots": [
      {
        "name": "default",
        "desc": "数值之后的自定义内容（如单位文案，规格 §35.2 slider）"
      }
    ]
  },
  "variantClasses": {
    "mode": {
      "single": [],
      "range": [
        ".kole-m-slider--range"
      ]
    },
    "marks": {
      "none": [],
      "with-marks": [
        ".kole-m-slider--marks",
        ".kole-m-slider__mark"
      ]
    },
    "showValue": {
      "true": [],
      "false": []
    }
  },
  "demos": [
    {
      "id": "basic",
      "group": "01 组件类型",
      "title": "基础用法",
      "desc": "在轨道上按住拖动即改值；轨道可视 4px、热区 44px 高。",
      "variant": "mode=single"
    },
    {
      "id": "steps",
      "group": "01 组件类型",
      "title": "带刻度",
      "desc": "marks=with-marks：轨道上标出等分点；取值仍按 step 吸附。",
      "variant": "marks=with-marks"
    },
    {
      "id": "range",
      "group": "01 组件类型",
      "title": "双滑块区间",
      "desc": "mode=range：两个滑块各自独立拖动，左值不会越过右值。",
      "variant": "mode=range"
    },
    {
      "id": "dragging",
      "group": "02 组件状态",
      "title": "拖动中",
      "desc": "滑块由 20px 放大到 24px，并给轨道加一层浅底作「抓住了」的反馈。",
      "variant": "状态 dragging"
    },
    {
      "id": "disabled",
      "group": "02 组件状态",
      "title": "禁用",
      "desc": "整条置灰且不响应：读屏播报不可用，指针事件不再改值。",
      "variant": "disabled=true"
    }
  ],
  "related": [
    {
      "slug": "mobile-stepper",
      "why": "有界区间里加减小整数、且需要精确值时用 Stepper；数值连续、更看重「大致位置」时才用 Slider"
    },
    {
      "slug": "mobile-input",
      "why": "需要键盘输入精确数值（金额、编号）时用 Input + 数字键盘；Slider 只适合粗选"
    },
    {
      "slug": "mobile-form",
      "why": "滑块作为表单里的一个字段时，标签、必填星号与错误提示由 Form 的 item 提供"
    }
  ]
}