Botón de opción

Categoría: Selección
Tokens: comp.radio-button
Nivel: Base
Se usa en: Radio group

Descripción general

Web: tanrei-radio-button; schedule
SwiftUI: TanreiRadioButton; schedule
Jetpack Compose: TanreiRadioButton; schedule
Flutter: TanreiRadioButton; schedule
React Native: RadioButton; schedule

Generado a partir de docs/status/status.json, specs/radio-button.spec.json

Un grupo

Uso

La revisión que dio al botón de opción sus tamaños actuales y un anillo que se engrosa hasta convertirse en un relleno solo cambió su aspecto y su movimiento, así que todos los ejemplos siguientes están al día. La web lo dibuja como dice la especificación. SwiftUI, Compose, Flutter y React Native van rezagados: hasta que se pongan al día siguen dibujando el botón de opción anterior, un anillo de 16 con un trazo de línea fina y un punto de 8 en una capa de estado de 28, y no reservan en el diseño los 48 de altura del objetivo. Desde entonces hay un ajuste que, por ahora, solo está en la web: el anillo y el relleno se dibujan como una sola forma.

<!-- Las opciones con un mismo name forman un grupo. El nombre del grupo viene del elemento que las rodea. -->
<div role="radiogroup" aria-labelledby="frequency-label">
  <span id="frequency-label">Frecuencia</span>
  <tanrei-radio-button name="frequency" value="daily" label="Cada día"></tanrei-radio-button>
  <tanrei-radio-button name="frequency" value="weekly" checked label="Cada semana"></tanrei-radio-button>
  <tanrei-radio-button name="frequency" value="monthly" label="Cada mes"></tanrei-radio-button>
</div>

<script type="module">
  import '@tanrei/web/components/radio-button';
  // Solo la opción que pasa a estar seleccionada emite change; la que sustituye, no.
  document.querySelector('[role="radiogroup"]').addEventListener('change', (e) => save(e.detail.value));
</script>

import { RadioButton } from '@tanrei/react';

<div role="radiogroup" aria-labelledby="frequency-label">
  <span id="frequency-label">Frecuencia</span>
  {options.map(({ value, label }) => (
    <RadioButton
      key={value}
      name="frequency"
      value={value}
      label={label}
      checked={frequency === value}
      onChange={(e) => setFrequency(e.detail.value)}
    />
  ))}
</div>

import Tanrei

// selection es un Binding<Frequency?>: una opción está seleccionada mientras este sea igual a su valor.
TanreiRadioGroup("Frecuencia") {
  TanreiRadioButton("Cada día", value: Frequency.daily, selection: $frequency)
  TanreiRadioButton("Cada semana", value: Frequency.weekly, selection: $frequency)
  TanreiRadioButton("Cada mes", value: Frequency.monthly, selection: $frequency)
}

import androidx.compose.foundation.selection.selectableGroup
import io.github.chnotchy.tanrei.components.TanreiRadioButton

// El elemento padre forma el grupo; el onClick de cada opción captura su valor.
Column(Modifier.selectableGroup()) {
    for ((value, label) in listOf("daily" to "Cada día", "weekly" to "Cada semana", "monthly" to "Cada mes")) {
        TanreiRadioButton(selected = frequency == value, onClick = { frequency = value }, label = label)
    }
}

import 'package:tanrei/tanrei.dart';

TanreiRadioGroup<Frequency>(
  groupValue: frequency,
  onChanged: (Frequency value) => setState(() => frequency = value),
  semanticLabel: 'Frecuencia',
  child: Column(
    children: <Widget>[
      for (final Frequency option in Frequency.values)
        TanreiRadioButton<Frequency>(value: option, label: option.label),
    ],
  ),
);

import { RadioButton, RadioGroup } from '@tanrei/react-native';

<RadioGroup accessibilityLabel="Frecuencia">
  {options.map(({ value, label }) => (
    <RadioButton key={value} value={value} label={label} selected={frequency === value} onSelect={setFrequency} />
  ))}
</RadioGroup>

Especificaciones

Seleccionado, sin seleccionar y deshabilitado

En el sistema predeterminado, el botón de opción es un anillo de 20 con un trazo de 2, sobre una capa de estado redonda de 40. Una opción seleccionada no dibuja ningún punto. Su anillo se engrosa hacia dentro hasta la mitad del radio, y el disco que queda en el interior se rellena con el color del anillo al 16 % de opacidad: un tinte claro, que se mantiene al menos a 3:1 del anillo. El anillo conserva su tamaño exterior en las dos condiciones. El anillo y el relleno son una sola forma: nada de lo que hay detrás del botón de opción se ve entre ellos, con ningún nivel de zoom ni densidad de pantalla, ni en ningún fotograma del cambio. Cuando la selección cambia, el trazo se engrosa o se afina mientras el color del anillo cambia y el relleno aparece o desaparece con un fundido; el relleno nunca crece desde el centro. Un cambio que llega antes de que termine el movimiento da la vuelta desde donde está y, donde el movimiento está reducido, la nueva condición se muestra de inmediato y por completo.

Cada opción ocupa en el diseño al menos 48 de alto, el tamaño del objetivo, con la capa de estado centrada en él. Por eso, las opciones apiladas sin separación entre ellas nunca comparten área de objetivo. Un producto que quiera colocar sus opciones más juntas reduce option.min-height en su propia capa y acepta que los objetivos se solapen.

Con m3-like, la opción seleccionada conserva el anillo, la separación y el punto de Material, pero el punto aparece con un fundido en lugar de crecer desde el centro. Con cupertino, el botón de opción conserva su tamaño más pequeño y dibuja el aspecto de Apple: un disco claro en un anillo fino y, cuando está seleccionado, una banda teñida alrededor de un centro claro.

Anatomía

Dibujado sobre el fixture unselected, tal como lo dibuja el paquete web.

Parte	Descripción
1 `container`	The round state layer behind the ring. It carries hover, focus and press and is invisible at rest.
2 `ring`	The circle that shows there is an option. Its outer diameter never changes; its stroke is thin while unselected and thickens inward, towards the center, while selected.
3 `fill` · opcional	What the ring leaves inside it, less an inset, tinted while selected (translucent in the default system) and clear while unselected. Where the inset is nothing it meets the ring's inner edge with no gap: ring and fill are drawn as one shape. It never grows or shrinks on its own, and it is never what carries the selection: the thickened ring is.
4 `label` · opcional	The visible text that names the option. A click on it selects the option.
5 `focus-ring`	Gap-then-ring indicator shown for keyboard focus, around the ring.

Medidas

Longitud	Token	Valor (px)
`container` size	`tanrei.comp.radio-button.container.size`	40
`ring` size	`tanrei.comp.radio-button.ring.size`	20

Dibujado sobre el fixture unselected, tal como lo dibuja el paquete web.

Propiedades

Propiedad	Tipo	Valor predeterminado	Descripción
`checked`	`boolean`	`false`	Whether this option is the one chosen in its group. Inside a radio group it follows the group's value.
`value`	`string`	`""`	What this option stands for: carried by change, and submitted with a form on the web.
`name`	`string`	`""`	The group this option belongs to where it does not stand in a radio group: on each platform that platform's bare way of forming a group (see platforms); the options of one group exclude each other and share one tab stop. Ignored inside a radio group, which is the group.
`disabled`	`boolean`	`false`	Prevents interaction; the option is skipped by the focus order and by the arrow keys.
`readOnly`	`boolean`	`false`	The person cannot select this option: it can still be focused and read, and the arrow keys still reach it, but a press, Space or an arrow key that lands on it selects nothing. Drawn as an enabled option, without the hover and press answers. A radio group that is read-only makes each of its options so (RAD-28).
`error`	`boolean`	`false`	Draws the option in the error form of its condition: the ring, and the fill while selected, in the error color (a required group left unanswered, a choice that cannot be taken). A radio group or a field group in error puts every option it holds there, so set it by hand only on options grouped without one (RAD-25). It draws and nothing more: the group, not the option, is exposed as invalid, and the words that say why are the group's.
`label`	`string`	`""`	The text that names the option: drawn next to the ring and used as the accessible name.
`labelHidden`	`boolean`	`false`	Draws no visible label but keeps label as the accessible name.

Eventos

Evento	Descripción
`change`	This option became selected by the user; carries its value. The option it replaced does not emit. Inside a radio group the group emits change in its place (RGP-4).

Estados

Comportamiento

Requisitos en formato EARS. Cada implementación de plataforma se prueba contra estos identificadores. El texto de los requisitos se muestra tal como está en la especificación, en inglés.

ID	Requisito
`RAD-1`	WHEN the user activates an unselected radio button by pointer, touch, Space, assistive technology or a click on its label THE radio button SHALL become selected and emit change exactly once with its value; Enter SHALL activate it only on a platform whose convention activates any focused control with Enter (Android, tvOS), and SHALL NOT on the web, where Enter submits the form.
`RAD-2`	WHEN the user activates a radio button that is already selected THE radio button SHALL stay selected and SHALL NOT emit change: a radio button is never cleared by its own activation.
`RAD-3`	WHEN a radio button becomes selected THE other radio buttons of its group SHALL become unselected, without emitting change.
`RAD-4`	WHEN a radio button in a group has keyboard focus and the user presses Down Arrow or Right Arrow THE group SHALL move focus to the next enabled radio button, wrapping from the last to the first, and select it; Up Arrow and Left Arrow SHALL do the same towards the previous one; in a right-to-left layout Right Arrow SHALL move to the previous and Left Arrow to the next.
`RAD-5`	THE group SHALL keep exactly one of its radio buttons in the tab order: the selected one, or the first enabled one while none is selected; Tab SHALL leave the group rather than move within it.
`RAD-6`	WHILE disabled is true THE radio button SHALL NOT change or emit change, SHALL NOT be focusable, SHALL be skipped by the arrow keys, SHALL ignore clicks on its label and SHALL expose the disabled state to assistive technology.
`RAD-7`	WHILE hovered, keyboard-focused or pressed THE radio button SHALL render its container, ring, fill, label and opacity from the component tokens of its condition (selected or unselected, or the error- form of either, RAD-26) in the highest-precedence active state, with precedence pressed over focused over hovered; focus gained by pointer or touch SHALL NOT select the focused state. A part the interaction states recolor changes over the component's state motion, as the container does; only a change of condition uses the selection motion (RAD-15).
`RAD-8`	WHEN the radio button receives keyboard focus THE radio button SHALL show the focus ring around its ring without animation; focus gained by pointer or touch SHALL NOT show it.
`RAD-9`	WHERE the visual size is below the minimum target THE radio button SHALL extend its hit area on both axes to sys.target.touch for touch input and sys.target.pointer for fine pointers, without changing its visual size; a platform that cannot tell the input type SHALL use sys.target.touch. The visible label SHALL be part of the hit area as well.
`RAD-10`	WHILE disabled is true THE radio button SHALL render its container, ring, fill, label and opacity from the disabled component tokens of its condition.
`RAD-11`	WHEN the radio button is pressed by pointer, touch or Space, or by Enter where Enter activates it (Android, tvOS; never on the web, where Enter submits the form) THE radio button SHALL show the pressed state without delay and SHALL keep it visible for at least sys.motion.duration.press-hold, even when the press ends sooner.
`RAD-12`	WHILE pressed THE radio button SHALL answer as sys.behavior.pressed-feedback names: overlay applies the pressed tokens to the whole container at once; ripple grows the pressed state layer from the point of contact (from the center for keyboard activation; a press outside the container (on the label) grows it from the container's center); dim applies the pressed opacity to the whole control and draws no state layer; none draws no answer to the press. Under ripple and dim only the container color stays with the state under the press; ring, fill, label, opacity and shape still come from the pressed tokens. Under none every part stays with the state under the press. The ripple grows over comp.radio-button.motion.feedback-duration with motion.state-easing, fades over motion.state-duration with motion.state-easing once the press has ended and press-hold has passed, and appears whole where motion is reduced.
`RAD-13`	THE radio button SHALL ease its container corners by sys.shape.corner-smoothing (0 is a quarter circle, 0.6 the iOS continuous corner; a platform with only the OS curve draws it for any amount above 0) and show its keyboard focus as sys.behavior.focus-style names (ring or glow); a platform that cannot draw a choice SHALL fall back to the first value and state that in its README.
`RAD-14`	THE radio button SHALL draw a ring of outer diameter comp.radio-button.ring.size centered in a round container of diameter comp.radio-button.container.size, the outer diameter the same in both conditions; while unselected the ring SHALL be stroked at comp.radio-button.ring.width inside that diameter, and while selected at comp.radio-button.ring.selected-width-share of the ring's radius (1 being a stroke as wide as the radius, a solid disc), or at comp.radio-button.ring.width where that is wider, the stroke growing inward from the outer diameter. It SHALL draw no dot of its own; what is drawn inside the ring is the fill (RAD-19).
`RAD-15`	WHEN the radio button becomes selected THE radio button SHALL, over comp.radio-button.motion.selection-duration with comp.radio-button.motion.selection-easing, thicken the ring's stroke inward from its unselected to its selected width, change the ring color from the unselected to the selected one, and run the fill's color continuously from comp.radio-button.unselected.fill.color (none in the default system) to comp.radio-button.selected.fill.color, fading the opacity in from none rather than passing through any other color; WHEN it becomes unselected it SHALL run the same change in reverse; the fill SHALL NOT grow from or shrink to the center; WHERE motion is reduced it SHALL show the new condition at once and in full, with no intermediate frame.
`RAD-16`	THE radio button SHALL expose the role radio with the state checked or not checked, and its position in its group and the group's size; THE group SHALL be exposed as a radio group: the radio group component, named by its label (RGP-10), or, where the options are grouped without one (RAD-25), a container whose accessible name the product gives.
`RAD-17`	WHILE label is not empty and labelHidden is false THE radio button SHALL draw label at the inline end of the container, comp.radio-button.label.gap away, in comp.radio-button.label.typescale, wrapping rather than truncating, the control centered on the label's first line; right-to-left layouts SHALL mirror the order.
`RAD-18`	WHILE labelHidden is true THE radio button SHALL draw no label and SHALL still expose label as its accessible name; WHILE label is not empty, or a Field that frames it gives it a label, THE radio button SHALL expose that label as its accessible name, over a name the product gives it on the element (aria-label or aria-labelledby); WHILE label is empty and the product gives the radio button a name of its own on the element — aria-label, or aria-labelledby naming an element — THE radio button SHALL expose that name as its accessible name; WHILE label is empty and the product gives it none THE radio button SHALL still render, and in debug builds report that it has no accessible name.
`RAD-19`	THE radio button SHALL draw the fill in both conditions: the area inside the ring's inner edge at that moment, less comp.radio-button.fill.inset all round, never under the ring, in the fill color of its condition and state (comp.radio-button.selected.fill.color or comp.radio-button.unselected.fill.color at rest, and comp.radio-button.error-selected.fill.color or comp.radio-button.error-unselected.fill.color in the error forms, RAD-26; an unselected one is none in the default system, so an unselected option shows no fill there) at comp.radio-button.fill.opacity; a fill whose diameter would be zero or less SHALL NOT be drawn.
`RAD-20`	WHEN the condition changes again before the selection motion of RAD-15 has finished THE radio button SHALL turn the change back from the stroke width and the ring and fill colors it has reached, and SHALL NOT jump to either end.
`RAD-21`	THE radio button SHALL take at least comp.radio-button.option.min-height of height in layout, the container centered in it; at its default, sys.target.touch, radio buttons stacked with no space between them keep whole targets that do not overlap, and a layer that lowers it accepts shared target area.
`RAD-22`	THE radio button SHALL take its layout direction from where it is used — the direction of the nearest ancestor that sets one, and the platform's own where none does — and SHALL have no direction setting of its own; WHEN that direction changes while the radio button is shown THE radio button SHALL draw itself for the new direction at once, without a motion of its own, keeping its selection and its focus.
`RAD-23`	THE radio button SHALL lay out its label as text of its own direction, isolated from the text around it: each takes the base direction of its first strong character, or the layout direction where it has none, so that a left-to-right word, a number with its sign or unit, a telephone number and an address keep their own order in a right-to-left layout and reorder nothing beside them; THE radio button SHALL still place the label and align its lines by the layout direction, not by the text's own.
`RAD-24`	WHILE comp.radio-button.fill.inset is 0 (the default system's) THE radio button SHALL draw the ring and the fill as one shape: every point inside the ring's outer diameter SHALL be painted by the ring, by the fill, or, along the circle where the two meet, by both in shares that add up to the whole, so that nothing behind the radio button shows between the ring's inner edge and the fill at any zoom, display density or fractional position, or in any frame of the selection motion (RAD-15); neither SHALL be painted over the other (RAD-19), so that the fill is nowhere more or less opaque than comp.radio-button.fill.opacity makes it. WHILE comp.radio-button.fill.inset is above 0 the space it leaves between the ring and the fill SHALL show what is behind the radio button, as wide as the inset all round.
`RAD-25`	WHILE the radio button stands in a radio group THE radio button SHALL take its group from it and from nothing else: checked SHALL follow the radio group's value and its own value (RGP-3), name SHALL be ignored, it SHALL be disabled WHILE the radio group is (RGP-7), and its selection by the person SHALL be reported by the radio group's change and by no event of its own that a listener on the group would receive as well (RGP-4). WHERE the radio button stands in no radio group it SHALL form its group by the platform's bare idiom — on the web the radio buttons of one name in the same form, or in the same document or shadow root outside a form — and RAD-3, RAD-4, RAD-5 and RAD-16 SHALL hold among those, the group's name, its required and invalid states and its layout being the product's, or those of a field group whose kind is radio-group that the product put around them (FGR-25). A radio button in no group at all SHALL still render and be selectable, as a group of one, and in debug builds SHALL report it where the platform can tell (on the web, a radio button with neither a radio group nor a name).
`RAD-26`	THE radio button SHALL draw the condition its props select — selected WHILE checked is true, otherwise unselected — and the error- form of that condition (error-selected, error-unselected) WHILE it is in error: WHILE error is true, or WHILE the radio group or the field group it stands in is in error and has put it there (RGP-8, FGR-8), as a checkbox draws the error- form of its condition (CHK-4). In an error form THE radio button SHALL render its container, ring, fill, label and opacity from the component tokens of that form in every state — at rest, hovered, focused and pressed with the precedence of RAD-7, and disabled as RAD-10 says — and SHALL change nothing else: the ring's diameter and its stroke in each condition (RAD-14), the fill's inset and opacity (RAD-19), the label, the focus indication (RAD-8), the hit area (RAD-9) and the selection motion (RAD-15), which runs between the two error forms' colors, are those of the same condition out of error. WHILE disabled is true the disabled tokens of the error form apply, which in the default system are the values of the plain form's: a disabled option shows no error color, because it cannot be the answer that puts the error right. WHEN the radio button enters or leaves the error forms without a change of selection THE radio button SHALL only recolor its ring and its fill, over comp.radio-button.motion.selection-duration with comp.radio-button.motion.selection-easing, and at once WHERE motion is reduced; nothing SHALL change size or move. THE radio button SHALL expose no invalid state and take no description for the error: the radio role has no such state, the group the options form carries it and the words that say why (RAD-16, RGP-10, FGR-25), and an option that repeated them would say the error once for every arrow key. It SHALL never set error itself, and being selected SHALL NOT clear it. WHERE the options are grouped without a radio group or a field group (RAD-25) error is the product's to set, on every option of the group together with the invalid state of the group it built.
`RAD-27`	WHERE the platform draws with a person's own forced colors (the web's forced-colors mode, and a platform's equivalent where it has one) THE radio button SHALL draw each error form exactly as it draws the same condition out of error there — its ring in the platform's own colors, the stroke's weight carrying the selection — and SHALL show no error color, because the person's colors leave none to show: the error is carried by the words of the group's error text and by the group's invalid state (RGP-14, FGR-17).
`RAD-28`	WHILE readOnly is true and disabled is false, or WHILE the radio group it stands in is read-only (RGP-20), THE radio button SHALL stay focusable, keep its place in its group's single tab stop (RAD-5) and be reached by its group's arrow keys (RAD-4); SHALL NOT become selected, and SHALL NOT emit change, on any activation — pointer, touch, Space, Enter where Enter activates it, assistive technology, a click on its label, a click dispatched on the element or an arrow key that moves focus to it — so that an arrow key moves focus to it and selects nothing, and from it moves focus on as RAD-4 says, selecting the option it lands on only where that option is not read-only; and SHALL be drawn from the resting component tokens of its condition — the enabled ones, never the disabled ones — and SHALL show no hovered and no pressed state, under any pressed feedback (no overlay, no ripple, no dim), while keyboard focus still selects the focused state and shows the focus ring (RAD-7, RAD-8). The radio role has no read-only state: the group says it — the radio group (RGP-20), or, where options are grouped without one (RAD-25), the container the product gives them. The product may still set checked. WHILE disabled is true as well, disabled wins (RAD-6).
`RAD-29`	WHERE the platform has ARIA attributes (the web), WHEN the product sets an aria- attribute on the host, by the attribute or by the ARIA property that reflects it, THE radio button SHALL move it to the data-aria- attribute of the same name, so that the host is no second node with its name, description or state, and SHALL expose it on the element that carries its role — an id reference by the elements it names in the host's tree or a tree around it, an error message as part of the description while the radio button is invalid — except those the radio button owns (aria-checked, aria-pressed, aria-disabled), which it SHALL move and not expose. WHEN the product removes the aria- attribute or its data-aria- twin, or sets the ARIA property that reflects it (ariaLabel, ariaDescribedByElements…) to null, THE radio button SHALL take it off that element. WHEN the product sets an aria- attribute the radio button owns THE radio button SHALL report it in debug builds.

Correspondencia de nombres por plataforma

Paridad no significa API idénticas. Cada plataforma expresa el mismo contrato con su propio estilo.

Especificación	Web	SwiftUI	Jetpack Compose	Flutter	React Native
Componente	`tanrei-radio-button`	`TanreiRadioButton`	`TanreiRadioButton`	`TanreiRadioButton`	`RadioButton`
`checked` · Propiedad	`checked`	`selection`	`selected`	`groupValue`	`selected`
`value` · Propiedad	`value`	`value`	`onClick`	`value`	`value`
`name` · Propiedad	`name`	`TanreiRadioGroup`	`selectableGroup`	`TanreiRadioGroup`	`RadioGroup`
`disabled` · Propiedad	`disabled`	`disabled`	`enabled`	`enabled`	`disabled`
`readOnly` · Propiedad	`readOnly`	`readOnly`	`readOnly`	`readOnly`	`readOnly`
`error` · Propiedad	`error`	`isError`	`isError`	`isError`	`error`
`label` · Propiedad	`label`	`title`	`label`	`label`	`label`
`labelHidden` · Propiedad	`labelHidden`	`labelsHidden`	`labelHidden`	`labelHidden`	`labelHidden`
`change` · Evento	`change`	`selection`	`onClick`	`onChanged`	`onSelect`
Notas	Form-associated, with the native radio's idiom: a group is the options with one `name` under the same form (or the same root without a form); the options manage the arrow keys and the single tab stop among themselves. A `tanrei-radio-group` is the usual group: inside one the option needs no `name`, takes `checked`, its tab stop and its position from the group and submits nothing itself (RAD-25). Options grouped by `name` alone are wrapped by the product in an element with role radiogroup and a name. `labelHidden` is the `label-hidden` attribute. `error` is a reflected boolean attribute. The option asks the frame around it as a checkbox does (`FieldControlController` with `errorCondition: true`, `takes: 'all'`), and draws its error form while `error` or the frame's `invalid` holds (`data-error` on `.root`); it writes no `aria-invalid`, and in a group in error it takes no description from the group's frame — it names itself, and its group says the error (RAD-26); alone in a Field it takes its name and description from the Field as any control does. Under `forced-colors: active` the error forms are the plain ones (RAD-27). `readOnly` is the `readonly` attribute (HTML's name; the native attribute does not apply to a radio button, so the option cancels the activation itself and writes no ARIA state, the radio role having none). In a `tanrei-radio-group` it is also read-only while the group is, without its own `readOnly` changing.	`TanreiRadioButton(_ title:, value: V, selection: Binding<V?>)`: checked is `selection == value`, and activation writes `value` to the binding, which is the change event. SwiftUI has no radio group on iOS, so `TanreiRadioGroup` (a container with no tokens) carries the group's name, the arrow keys and the position announcements; it is the radio group component (`radio-group`), which adds the frame and holds the selection. Lagging: it draws a 16 ring with a 1 stroke and an 8 dot in a 28 state layer, not this spec's ring and dot. The error condition (`isError`, the error forms of RAD-26 and RAD-27, set by `TanreiRadioGroup` in error through the environment) is not built on this platform yet.	Compose idiom, as `RadioButton`: the caller passes `selected` and an `onClick` that captures the option's value; the parent forms the group with `Modifier.selectableGroup()`, which a `TanreiRadioGroup` (`radio-group`) applies itself. `enabled` is the inverse flag. Lagging: it draws a 16 ring with a 1 stroke and an 8 dot in a 28 state layer, not this spec's ring and dot. The error condition (`isError`, the error forms of RAD-26 and RAD-27, given by a `TanreiRadioGroup` in error through its composition local) is not built on this platform yet.	Flutter idiom: `TanreiRadioButton<T>(value:)` inside a `TanreiRadioGroup<T>(groupValue:, onChanged:, semanticLabel:)` ancestor, shaped like Flutter's `RadioGroup` (3.35), which the package's minimum Flutter (3.32) lacks and whose name it must not take; checked is `groupValue == value`. The group carries the arrow keys, the single Tab stop and the radio-group semantics; it is the radio group component (`radio-group`), which adds the frame. `enabled` is the inverse flag, as Flutter's radio has since `RadioGroup` replaced the per-radio `onChanged`. Lagging: it draws a 16 ring with a 1 stroke and an 8 dot in a 28 state layer, not this spec's ring and dot. The error condition (`isError`, the error forms of RAD-26 and RAD-27, given by a `TanreiRadioGroup` in error through its inherited scope) is not built on this platform yet.	Controlled: `onSelect(value)` fires and the caller moves `selected`. React Native has no group idiom, so a `RadioGroup` parent (no tokens) carries the radiogroup role, its name and the arrow keys where a keyboard exists; it is the radio group component (`radio-group`), which adds the frame and holds the value. Lagging: it draws a 16 ring with a 1 stroke and an 8 dot in a 28 state layer, not this spec's ring and dot. The error condition (`error`, the error forms of RAD-26 and RAD-27, given by a `RadioGroup` in error through its context) is not built on this platform yet.

Tokens

Token	Alias de	Valor resuelto (claro)
`--tanrei-comp-radio-button-container-shape`	`sys.shape.corner.full`	9999px
`--tanrei-comp-radio-button-container-size`	—	40px
`--tanrei-comp-radio-button-disabled-container-shape`	—	9999px
`--tanrei-comp-radio-button-disabled-opacity`	—	1
`--tanrei-comp-radio-button-error-selected-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-selected-disabled-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-selected-disabled-fill-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-selected-disabled-label-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-selected-disabled-ring-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-selected-disabled-state-layer-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-selected-fill-color`	`comp.radio-button.error-selected.ring.color`	#cd262f
`--tanrei-comp-radio-button-error-selected-focused-container-color`	—	#cd262f · 10%
`--tanrei-comp-radio-button-error-selected-focused-fill-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-focused-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-error-selected-focused-ring-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-focused-state-layer-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-hovered-container-color`	—	#cd262f · 8%
`--tanrei-comp-radio-button-error-selected-hovered-fill-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-hovered-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-error-selected-hovered-ring-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-hovered-state-layer-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-label-color`	`sys.color.on-surface`	#1b1b1b
`--tanrei-comp-radio-button-error-selected-pressed-container-color`	—	#cd262f · 10%
`--tanrei-comp-radio-button-error-selected-pressed-fill-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-pressed-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-error-selected-pressed-ring-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-pressed-state-layer-color`	—	#cd262f
`--tanrei-comp-radio-button-error-selected-ring-color`	`sys.color.error`	#cd262f
`--tanrei-comp-radio-button-error-selected-state-layer-color`	`comp.radio-button.error-selected.ring.color`	#cd262f
`--tanrei-comp-radio-button-error-unselected-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-disabled-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-disabled-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-disabled-label-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-unselected-disabled-ring-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-unselected-disabled-state-layer-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-error-unselected-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-focused-container-color`	—	#cd262f · 10%
`--tanrei-comp-radio-button-error-unselected-focused-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-focused-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-error-unselected-focused-ring-color`	—	#cd262f
`--tanrei-comp-radio-button-error-unselected-focused-state-layer-color`	—	#cd262f
`--tanrei-comp-radio-button-error-unselected-hovered-container-color`	—	#cd262f · 8%
`--tanrei-comp-radio-button-error-unselected-hovered-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-hovered-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-error-unselected-hovered-ring-color`	—	#cd262f
`--tanrei-comp-radio-button-error-unselected-hovered-state-layer-color`	—	#cd262f
`--tanrei-comp-radio-button-error-unselected-label-color`	`sys.color.on-surface`	#1b1b1b
`--tanrei-comp-radio-button-error-unselected-pressed-container-color`	—	#cd262f · 10%
`--tanrei-comp-radio-button-error-unselected-pressed-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-error-unselected-pressed-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-error-unselected-pressed-ring-color`	—	#cd262f
`--tanrei-comp-radio-button-error-unselected-pressed-state-layer-color`	—	#cd262f
`--tanrei-comp-radio-button-error-unselected-ring-color`	`sys.color.error`	#cd262f
`--tanrei-comp-radio-button-error-unselected-state-layer-color`	`comp.radio-button.error-unselected.ring.color`	#cd262f
`--tanrei-comp-radio-button-fill-inset`	—	0px
`--tanrei-comp-radio-button-fill-opacity`	`sys.state.selected-state-layer-opacity`	0.16
`--tanrei-comp-radio-button-focused-container-shape`	—	9999px
`--tanrei-comp-radio-button-focused-opacity`	—	1
`--tanrei-comp-radio-button-hovered-container-shape`	—	9999px
`--tanrei-comp-radio-button-hovered-opacity`	—	1
`--tanrei-comp-radio-button-label-gap`	`sys.space.space50`	4px
`--tanrei-comp-radio-button-motion-feedback-duration`	`sys.motion.role.feedback`	450ms
`--tanrei-comp-radio-button-motion-selection-duration`	`sys.motion.role.selection.mark`	250ms
`--tanrei-comp-radio-button-motion-selection-easing`	`sys.motion.easing.state`	cubic-bezier(0.2, 0, 0, 1)
`--tanrei-comp-radio-button-motion-state-duration`	`sys.motion.role.state.compact`	200ms
`--tanrei-comp-radio-button-motion-state-easing`	`sys.motion.easing.state`	cubic-bezier(0.2, 0, 0, 1)
`--tanrei-comp-radio-button-option-min-height`	`sys.target.touch`	48px
`--tanrei-comp-radio-button-pressed-container-shape`	—	9999px
`--tanrei-comp-radio-button-pressed-opacity`	—	1
`--tanrei-comp-radio-button-ring-selected-width-share`	—	0.5
`--tanrei-comp-radio-button-ring-size`	—	20px
`--tanrei-comp-radio-button-ring-width`	`sys.border.thick`	2px
`--tanrei-comp-radio-button-selected-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-selected-disabled-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-selected-disabled-fill-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-selected-disabled-label-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-selected-disabled-ring-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-selected-disabled-state-layer-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-selected-fill-color`	`comp.radio-button.selected.ring.color`	#1b1b1b
`--tanrei-comp-radio-button-selected-focused-container-color`	—	#1b1b1b · 10%
`--tanrei-comp-radio-button-selected-focused-fill-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-focused-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-focused-ring-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-focused-state-layer-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-hovered-container-color`	—	#1b1b1b · 8%
`--tanrei-comp-radio-button-selected-hovered-fill-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-hovered-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-hovered-ring-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-hovered-state-layer-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-label-color`	`sys.color.on-surface`	#1b1b1b
`--tanrei-comp-radio-button-selected-pressed-container-color`	—	#1b1b1b · 10%
`--tanrei-comp-radio-button-selected-pressed-fill-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-pressed-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-pressed-ring-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-pressed-state-layer-color`	—	#1b1b1b
`--tanrei-comp-radio-button-selected-ring-color`	`sys.color.primary`	#1b1b1b
`--tanrei-comp-radio-button-selected-state-layer-color`	`comp.radio-button.selected.ring.color`	#1b1b1b
`--tanrei-comp-radio-button-unselected-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-disabled-container-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-disabled-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-disabled-label-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-unselected-disabled-ring-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-unselected-disabled-state-layer-color`	—	#1b1b1b · 38%
`--tanrei-comp-radio-button-unselected-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-focused-container-color`	—	#848484 · 10%
`--tanrei-comp-radio-button-unselected-focused-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-focused-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-unselected-focused-ring-color`	—	#848484
`--tanrei-comp-radio-button-unselected-focused-state-layer-color`	—	#848484
`--tanrei-comp-radio-button-unselected-hovered-container-color`	—	#848484 · 8%
`--tanrei-comp-radio-button-unselected-hovered-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-hovered-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-unselected-hovered-ring-color`	—	#848484
`--tanrei-comp-radio-button-unselected-hovered-state-layer-color`	—	#848484
`--tanrei-comp-radio-button-unselected-label-color`	`sys.color.on-surface`	#1b1b1b
`--tanrei-comp-radio-button-unselected-pressed-container-color`	—	#848484 · 10%
`--tanrei-comp-radio-button-unselected-pressed-fill-color`	—	#000000 · 0%
`--tanrei-comp-radio-button-unselected-pressed-label-color`	—	#1b1b1b
`--tanrei-comp-radio-button-unselected-pressed-ring-color`	—	#848484
`--tanrei-comp-radio-button-unselected-pressed-state-layer-color`	—	#848484
`--tanrei-comp-radio-button-unselected-ring-color`	`sys.color.outline`	#848484
`--tanrei-comp-radio-button-unselected-state-layer-color`	`comp.radio-button.unselected.ring.color`	#848484
`--tanrei-comp-radio-button-label-typescale`	`sys.typescale.body`	400 14px/1.5714

Fixtures

Representaciones canónicas. Todas las plataformas capturan cada fixture con el mismo identificador para poder comparar los resultados.

unselected

value: weekly name: frequency label: Weekly

selected

checked: true value: weekly name: frequency label: Weekly

error-unselected

value: weekly name: frequency error: true label: Weekly

error-selected

checked: true value: weekly name: frequency error: true label: Weekly

disabled-unselected

value: weekly name: frequency disabled: true label: Weekly

disabled-selected

checked: true value: weekly name: frequency disabled: true label: Weekly

label-hidden

checked: true value: weekly name: frequency label: Weekly labelHidden: true

read-only-selected

checked: true value: weekly name: frequency readOnly: true label: Weekly

Generado a partir de specs/radio-button.spec.json, tokens/comp/radio-button.tokens.json, design/tokens/

Pautas

Cuándo usarlo

Usa botones de opción cuando una pregunta tenga exactamente una respuesta y un número reducido de opciones que conviene comparar una al lado de otra, como la velocidad de una entrega o la frecuencia con la que se envía un resumen. Todas las opciones se ven a la vez, así que el grupo ocupa espacio. Cuando haya muchas opciones, o el espacio sea escaso, usa una lista o un menú que muestre solo la elegida.

Un grupo puede empezar con una opción seleccionada cuando esa opción sea una respuesta segura y probable. Deja todas las opciones sin seleccionar cuando necesites que la persona responda de forma deliberada. Una vez seleccionada una opción, la persona no puede devolver el grupo al estado sin selección, porque un botón de opción nunca se desmarca al activarlo. Si «ninguna» es una respuesta válida, añádela como opción.

Casilla de verificación, botón de opción o interruptor

Control	Elecciones	Surte efecto	Úsalo para
Casilla de verificación	Cualquier número de elecciones independientes, incluida ninguna	Cuando la persona confirma	Opciones de un formulario, aceptar unas condiciones, seleccionar filas
Botón de opción	Exactamente una de un grupo pequeño, todas a la vista	Cuando la persona confirma, por lo general	Una sola respuesta a una sola pregunta
Interruptor	Un solo ajuste, activado o desactivado	De inmediato	Ajustes que se aplican en cuanto cambian

Evita

No uses un único botón de opción aislado. Para una sola elección de sí o no, usa una casilla de verificación o un interruptor.
No uses botones de opción para elecciones que no se excluyen entre sí. Usa casillas de verificación.
No inicies una acción de peso, como salir de la página, en el momento en que se selecciona una opción. Las teclas de flecha seleccionan cada opción por la que pasan, así que quien usa el teclado la desencadenaría de camino a la que quiere.
No repartas un mismo grupo por distintas partes de la pantalla.

Accesibilidad

Rol: radio
Etiquetado: label is each option's accessible name, visible or not (labelHidden). The group's name (the question the options answer) is the radio group's label. Where options are grouped without a radio group (RAD-25) the product gives it: on the web a container with role radiogroup and aria-labelledby; on the other platforms the group container's label.
Objetivo mínimo: El área de pulsación cumple el tamaño mínimo de objetivo aunque el tamaño visual sea menor. minimum 32px · pointer 44px · spacing 8px · touch 48px

Teclado

Teclas	Acción
`Tab / Shift+Tab`	Moves focus into the group (to the selected option, or the first enabled one when none is selected) and out of it.
`Space`	Selects the focused option if it is not selected; nothing while it is read-only.
`Down Arrow / Right Arrow`	Moves to the next enabled option and selects it, wrapping (Left Arrow in right-to-left); an option that is read-only is focused and not selected.
`Up Arrow / Left Arrow`	Moves to the previous enabled option and selects it, wrapping (Right Arrow in right-to-left); an option that is read-only is focused and not selected.
`Enter`	Nothing on the web (it submits the form); selects where the platform activates any focused control with Enter (Android, tvOS).

Notas

Scope: this spec covers the option, and what holds among the options of any group however it is formed (RAD-3, RAD-4, RAD-5, RAD-16). The radio group component (`radio-group`) is the group in the usual case: it holds the value, names the set and draws its label, its description and its error. Grouping without it (RAD-25) is for options that one container cannot lay out — one in each row of a table or a list, one on each card — and draws nothing, so it has no tokens.
iOS has no radio role: an option is exposed as a button with the selected trait, and its position ("2 of 3") through its accessibility value.
The ring alone carries the selected condition at 3:1 against the surface (WCAG 1.4.11): the selected ring is sys.color.primary, which the build holds to 4.5:1 on every surface role, and its stroke is 2.5 times the unselected one, so the selection does not rest on color alone (WCAG 1.4.1). The translucent fill is not counted for that, but it is a part of the mark, and WCAG 1.4.11 measures a part against the colors next to it: where the fill meets the ring (fill.inset 0) it is held 3:1 against the ring, and where an inset leaves a gap (a dot) it is held 3:1 against the gap, which shows what the radio stands on. The build holds it as drawn — the fill at comp.radio-button.fill.opacity and the ring, each over the state layer of the state — at rest, hovered, focused and pressed (a disabled option is exempt, as WCAG exempts an inactive control), on every surface role, in every scheme; in the default system the fill is the ring's color at 16 %, 3.17:1 from the ring at the least (the focused error form on surface-container-highest in light). In an error form the ring is sys.color.error, which the build holds to 4.5:1 on every surface role as it holds the primary role, so both error forms keep 3:1 (WCAG 1.4.11) and the selection is still told by the stroke.
A group in error is said by the radio group — its error text and its invalid state (RGP-8) — and shown on every option of it: the ring, and the fill of the selected one, take the error color (RAD-26), as a checkbox's box does (CHK-4). The color is one more sign and never the only one (WCAG 1.4.1): the words and the state carry the error, and the option exposes no invalid state of its own, because the radio role has none. The option has an error condition so that one form marks its checkboxes and its radio buttons by one rule.
Read-only (RAD-28) is said by the group, never by the option: WAI-ARIA has aria-readonly on radiogroup and not on radio. A radio group that is read-only says it (RGP-20); options grouped by name alone are read-only as a set when each is, and the product says it on the container it gives them (on the web, aria-readonly on the element with role radiogroup). HTML's readonly attribute does not apply to a radio button, so the option cancels its activation itself.

Generado a partir de specs/radio-button.spec.json, tokens/sys/measure.tokens.json

De qué se encarga el componente

Cada opción expone el rol de botón de opción (radio), si está seleccionada, su estado deshabilitado y su posición en el grupo junto con el tamaño del grupo («2 de 3»). Las plataformas de Apple no tienen ese rol, así que ahí una opción es un botón con el rasgo de seleccionado, y su posición es su valor de accesibilidad. La semántica de Flutter todavía no puede indicar la posición.
La etiqueta es el nombre accesible, tanto si se dibuja como si se oculta con labelHidden. El texto dibujado queda oculto para la tecnología de apoyo, de modo que el nombre se lee una sola vez.
Un grupo tiene una sola parada de tabulación: la opción seleccionada o, mientras no haya ninguna, la primera habilitada. Las teclas de flecha pasan a la opción habilitada siguiente o anterior y la seleccionan, y dan la vuelta en los extremos; Flecha izquierda y Flecha derecha se intercambian en un diseño de derecha a izquierda.
Espacio selecciona la opción que tiene el foco. Enter la selecciona solo donde la plataforma activa con Enter cualquier control con foco (Android, tvOS); en la web, Enter envía el formulario.
Mientras readOnly está activo, o mientras el grupo de opciones que lo rodea es de solo lectura, una opción sigue pudiendo recibir el foco y las flechas siguen llegando a ella, pero nada la selecciona: ni una pulsación, ni Espacio, ni un clic en la etiqueta, ni click(), ni una flecha que llegue a ella. No muestra respuesta al pasar el puntero ni al pulsar. El rol radio no tiene estado de solo lectura, así que lo dice el grupo.
Seleccionar una opción deja las demás sin seleccionar. Solo la opción que pasa a estar seleccionada notifica el cambio, y activar la opción seleccionada no hace nada.
Un clic o un toque en la etiqueta selecciona la opción. La etiqueta forma parte del área de pulsación, y el área de pulsación cumple el objetivo mínimo. Cada opción reserva en el diseño la altura del objetivo, de modo que las opciones apiladas conservan objetivos completos y separados.
La selección la transmite el anillo por sí solo: el anillo seleccionado mantiene un contraste de 3:1 frente a todas las superficies del sistema predeterminado, y es dos veces y media más grueso que el no seleccionado. El relleno translúcido no cuenta para eso, pero se mantiene a 3:1 del anillo con el que se toca, en cada estado, sobre cada superficie y en cada esquema (WCAG 1.4.11), de modo que el centro de la opción elegida también se ve.
Muestra el indicador de foco solo para el foco del teclado.
Donde el movimiento está reducido, la nueva condición se muestra de inmediato y por completo.
Las compilaciones de depuración notifican la falta de etiqueta.

Carencias conocidas por plataforma:

SwiftUI, Compose, Flutter y React Native siguen dibujando el botón de opción anterior, con un punto y con los tamaños anteriores, todavía no dibujan el anillo y el relleno como una sola forma y no reservan en el diseño la altura del objetivo, de modo que las opciones apiladas sin separación comparten área de objetivo.
readOnly está por ahora solo en la web: SwiftUI, Compose, Flutter y React Native todavía no lo tienen.
Con m3-like, el punto de la opción seleccionada aparece con un fundido a su tamaño completo, mientras que Material lo hace crecer desde el centro (laguna de imitación radio-dot-scale-in).

Qué debes hacer tú

Da al grupo como nombre la pregunta a la que responde. En la web, envuelve las opciones en un elemento con role="radiogroup" y aria-labelledby, o en un <fieldset> con un <legend>. En Flutter, define semanticLabel en TanreiRadioGroup; en React Native, define accessibilityLabel en RadioGroup.
Forma el grupo como lo hace cada plataforma, para que las teclas y la posición funcionen: un mismo name en la web, Modifier.selectableGroup() en el elemento padre en Compose, TanreiRadioGroup en Flutter y RadioGroup en React Native.
Cuando agrupes tú las opciones por name y hagas cada una de solo lectura, dilo en el contenedor: aria-readonly="true" junto a role="radiogroup". Un grupo de botones de opción con readOnly lo hace por ti.
Si la pregunta es obligatoria y queda sin responder, muestra el mensaje en el grupo: un grupo de botones de opción en error dibuja su texto de error y pone todos los botones de opción en su forma de error. Para opciones agrupadas sin uno, define error en cada botón de opción: el anillo y el punto toman el color de error, como el recuadro de una casilla de verificación. Una opción deshabilitada no muestra el color de error.
Un botón de opción en error no se expone como no válido, porque su rol no tiene ese estado. Lo dice el grupo: un grupo de botones de opción es no válido y su texto de error lo describe. Donde agrupes tú las opciones, di el error con palabras junto a ellas.
Si cambias el estilo del anillo y del relleno en tu propia capa, mantén el anillo lo bastante marcado para que muestre la selección por sí solo. La compilación no lo comprueba.
En React Native, pasa positionText a RadioGroup cuando el producto no esté en inglés. De forma predeterminada, la posición se anuncia como «2 of 3».

Código fuente e incidencias en GitHub