# 浮动指示条

- 页面: https://jiguang132.com/zh/resources/mantine/docs/floating-indicator
- 资源: Mantine Core (https://jiguang132.com/zh/resources/mantine.md)
- 全部指南: https://jiguang132.com/zh/resources/mantine/docs.md

Mantine Core 的独立组件，请不要替换为 JGuang UI/Base UI 的同名 API。

## 安装

```bash
npm install @mantine/core@9.7.1 @mantine/hooks@9.7.1
```

入口引入 `@mantine/core/styles.css`，并在根组件使用 `MantineProvider`；通过 `forceColorScheme` 同步深浅色主题。

## 使用与验证

在左侧选择组件，在预览中操作它的状态；使用“查看代码”检查真实源码。安装后执行类型检查和构建，再验证键盘焦点、手机布局与深浅色主题。

## 来源

https://github.com/mantinedev/mantine/tree/f0e2bc6d28b0f0b8aaefb5b859937bf77f539df7
MIT 许可证；不包括付费内容。下方提供上游英文参考内容，中文使用指南已适配；上游详细参考暂保留英文。

---


## 版本与兼容性

固定的 Mantine Core 9.7.1 要求 React 和 React DOM 满足 `^19.2.0`，并配套 `@mantine/hooks@9.7.1`。此条件来自实际 npm 包的 peerDependencies。React 18 或其他不兼容版本不能强行安装；先向项目负责人说明升级影响并确认方案，不使用 --force/--legacy-peer-deps 掩盖冲突。入口的原生 Provider 开启 `theme.respectReducedMotion`，并用 `forceColorScheme` 控制深浅色。

## 适用场景

在引用的目标元素之间移动指示条。

## 本地示例使用的原生参数

以下参数由本地、经过类型检查的 JSX 示例提取，按所属组件区分。不是全部属性清单；完整签名和继承关系见下方固定源码参考。

| 组件参数 | 说明 |
| --- | --- |
| `Box.pos` | Mantine 定位样式参数。 |
| `Button.variant` | 原生视觉变体，不是清单页面的场景标识。 |
| `Button.onClick` | 本地点击处理，应按需替换为明确的业务操作。 |
| `Button.style` | 本地样式或布局对象。 |
| `FloatingIndicator.parent` | 包含区域的 DOM 元素引用。 |
| `FloatingIndicator.target` | 当前组件要求的目标 DOM 引用或选择器。 |
| `FloatingIndicator.bg` | Mantine 背景样式参数。 |
| `FloatingIndicator.style` | 本地样式或布局对象。 |

## 交互与状态检查

当前场景：默认。切换支持的禁用、错误或只读场景后检查真实行为；无此原生状态的组件不会被强行添加统一属性。验证键盘焦点和退出方式，修改值后按原生回调签名连接业务状态。

## 业务接入边界

需要真实 parent 和 target DOM 引用；初始空引用是正常状态，不能用索引替代元素。

## 宿主配置

先安装固定版本 @mantine/core 和 @mantine/hooks，在入口引入 @mantine/core/styles.css，并使用 MantineProvider。示例的 theme 和 variant 是 JGuang 编写的宿主参数，不是所有原生组件都接受的统一 API；通过 forceColorScheme 同步应用主题。源码面板中的原生实现仅供阅读，使用 npm 导出，不要单独复制内部实现。此批只覆盖 Core，不包括日期、图表和表单扩展包。上游详细说明保留英文，不宣称全文中文化。


## 可运行用法

以下代码使用资源原生 API；不是把其他设计系统的同名组件替换进来。

```tsx
import { useState } from 'react';
import * as M from '@mantine/core';
import '@mantine/core/styles.css';

const fruit = ["Apple", "Banana", "Orange"];
function ComponentPreview({ variant = 'Default' }: { variant?: string }) {
const [indicatorParent, setIndicatorParent] = useState<HTMLDivElement | null>(null);
const [indicatorTarget, setIndicatorTarget] = useState<HTMLButtonElement | null>(null);
return <M.Box ref={setIndicatorParent} pos="relative"><M.Group>{fruit.map((item, index) => <M.Button key={item} ref={index === 0 ? setIndicatorTarget : undefined} variant="subtle" onClick={(event) => setIndicatorTarget(event.currentTarget)} style={{ position: "relative", zIndex: 1 }}>{item}</M.Button>)}</M.Group><M.FloatingIndicator parent={indicatorParent} target={indicatorTarget} bg="blue.1" style={{ borderRadius: 8 }} /></M.Box>;
}
export default function Example({ variant = 'Default', theme = 'light' }: { variant?: string; theme?: 'light' | 'dark' }) {
return <M.MantineProvider forceColorScheme={theme} theme={{ respectReducedMotion: true }}><ComponentPreview variant={variant} /></M.MantineProvider>;
}

```


## 可用状态与示例

默认

示例遵循 Mantine 原生 API。支持多状态的输入组件可将示例中的 variant 改为 Disabled、Invalid 或 Read only；这些只是示例标签，不是新增的组件属性。改造时保留组件要求的数据、受控值、store 和复合子组件结构。


## Usage

`FloatingIndicator` is designed to highlight the active element in a group.
It can be used to create custom segmented controls, tabs and other similar components.

`FloatingIndicator` renders an element over the `target` element. To calculate the position, it is
required to pass a `parent` element. **The parent element must have `position: relative` CSS property** –
this is essential for correct positioning. The component returns `null` and renders nothing if either
`target` or `parent` is not provided.

By default, `FloatingIndicator` does not have any visible styles. You can use the `className` prop
or [Styles API](/styles/styles-api) to apply styles. Note that the indicator's `transform`, `width`,
and `height` styles are set directly via JavaScript to enable smooth position transitions – these
cannot be overridden via the Styles API.



## Multiple rows

`FloatingIndicator` can be used to highlight the active element in a group with multiple rows:



## Example: Tabs




## 源码参数参考

以下实现签名和类型从本地固定版本源码生成。保留可选属性、原生继承类型、联合分支和 never 限制；不会将其他设计系统的 API 混入。forwardRef 实现中的 ref 属于 React 引用，不是新增业务属性。此区域是原始类型参考，不是上游说明的全文翻译。


```ts
FloatingIndicator(_props)
```



```ts
export type FloatingIndicatorStylesNames = 'root';

export type FloatingIndicatorCssVariables = {
  root: '--transition-duration';
};

export interface FloatingIndicatorProps
  extends BoxProps, StylesApiProps<FloatingIndicatorFactory>, ElementProps<'div'> {
  /** Target element over which the indicator is displayed.
   * The indicator will be positioned to match the target's size and position.
   * */
  target: HTMLElement | null | undefined;

  /** Parent container element that must have `position: relative`.
   * The indicator's position is calculated relative to this element.
   * */
  parent: HTMLElement | null | undefined;

  /** Transition duration in ms @default 150 */
  transitionDuration?: number | string;

  /** Controls whether the indicator should be hidden initially and displayed after the parent's transition ends.
   * Set to `true` when the parent container has CSS transitions (e.g., `transform: scale()`) to prevent
   * the indicator from appearing at the wrong position during the parent's animation.
   * @default false
   * */
  displayAfterTransitionEnd?: boolean;

  /** Called when the indicator starts transitioning to a new position */
  onTransitionStart?: () => void;

  /** Called when the indicator finishes transitioning to a new position */
  onTransitionEnd?: () => void;
}

export type FloatingIndicatorFactory = Factory<{
  props: FloatingIndicatorProps;
  ref: HTMLDivElement;
  stylesNames: FloatingIndicatorStylesNames;
  vars: FloatingIndicatorCssVariables;
  ctx: { shouldReduceMotion: boolean };
}>;

export type Mod = Record<string, any> | string;

export type BoxMod = Mod | Mod[] | BoxMod[];

export interface BoxProps extends MantineStyleProps {
  /** Class added to the root element, if applicable */
  className?: string | undefined;

  /** Inline style added to root component element, can subscribe to theme defined on MantineProvider */
  style?: MantineStyleProp;

  /** CSS variables defined on root component element */
  __vars?: CssVarsProp;

  /** `size` property passed down the HTML element */
  __size?: string;

  /** Breakpoint above which the component is hidden with `display: none` */
  hiddenFrom?: MantineBreakpoint;

  /** Breakpoint below which the component is hidden with `display: none` */
  visibleFrom?: MantineBreakpoint;

  /** Determines whether component should be hidden in light color scheme with `display: none` */
  lightHidden?: boolean;

  /** Determines whether component should be hidden in dark color scheme with `display: none` */
  darkHidden?: boolean;

  /** Element modifiers transformed into `data-` attributes, for example, `{ 'data-size': 'xl' }`, falsy values are removed */
  mod?: BoxMod;
}

export type ElementProps<
  ElementType extends React.ElementType,
  PropsToOmit extends string = never,
> = Omit<React.ComponentProps<ElementType>, 'style' | PropsToOmit>;

export interface CSSProperties extends React.CSSProperties {
  [key: string]: any;
}

type MantineStyle = CSSProperties | ((theme: MantineTheme) => CSSProperties);

export type MantineStyleProp = MantineStyle | MantineStyle[] | MantineStyleProp[] | undefined;

export type CssVariable = `--${string}`;

export type CssVariables<Variable extends string = CssVariable> = Partial<Record<Variable, string>>;

export type CssVars<Variable extends string = CssVariable> =
  | CssVariables<Variable>
  | ((theme: MantineTheme) => CssVariables<Variable>)
  | CssVars<Variable>[];

export type CssVarsProp<Variable extends string = CssVariable> =
  | CssVars<Variable>
  | CssVars<Variable>[];
```


### 原生与外部类型

以下外部类型仍由 React 或资源自身依赖定义，没有手工展开为虚构属性。实际可用类型以安装版本的 TypeScript 检查为准。


```ts
Factory<{
  props: FloatingIndicatorProps;
  ref: HTMLDivElement;
  stylesNames: FloatingIndicatorStylesNames;
  vars: FloatingIndicatorCssVariables;
  ctx: { shouldReduceMotion: boolean };
}>
MantineStyleProps
React.CSSProperties
MantineTheme
Partial<Record<Variable, string>>
Record<Variable, string>
Variable
MantineBreakpoint
Record<string, any>
StylesApiProps<FloatingIndicatorFactory>
React.ElementType
Omit<React.ComponentProps<ElementType>, 'style' | PropsToOmit>
React.ComponentProps<ElementType>
ElementType
PropsToOmit
HTMLElement
HTMLDivElement
```

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JGuang 全部资源索引: https://jiguang132.com/llms.txt