Enum SemanticsWidgetRole 

pub enum SemanticsWidgetRole {
    Button,
    Checkbox,
    Switch,
    RadioButton,
    Tab,
    Image,
    DropdownList,
    ValuePicker,
    Header,
    Dialog,
    Link,
    SearchField,
    ProgressBar,
    ToggleButton,
    Alert,
    Toolbar,
    Menu,
    MenuItem,
    TabBar,
    List,
    ListItem,
    RadioGroup,
}

Re-export the UI crate so applications can depend on a single crate. What kind of control a node is, as screen readers announce it.

This is Compose’s SemanticsProperties.Role (Modifier.semantics { role = Role.RadioButton }), not a description of where the node sits in the tree. A screen reader turns it into the trailing noun it speaks after the label — TalkBack says “CAMPAIGN, radio button, selected” — and into the on/off wording it uses for a switch. Compose keeps this separate from the node’s structural kind for the same reason Cranpose does: a Row that happens to be clickable is still a row, and a drawn ring segment that is a radio button has no layout node of its own at all.

Variants

Button

Checkbox

Switch

RadioButton

Tab

Image

DropdownList

A control that opens a list of choices and holds the one that is picked. Compose’s Role.DropdownList.

ValuePicker

A control that holds one value out of an ordered set and steps through them. Compose’s Role.ValuePicker.

Header

Compose’s heading(), which is a property rather than a Role, but reaches the platform through the same field on every backend Cranpose targets (AccessibilityNodeInfo.setHeading, Role::Heading, <h*>/UIAccessibilityTraitHeader).

Dialog

A modal surface that takes over the screen until it is dismissed. Screen readers announce it and confine their traversal to it, which is the accessible half of what makes a dialog modal.

Link

Text that takes the user somewhere else when pressed. Compose has no such Role; SwiftUI’s .isLink, ARIA’s link.

SearchField

A field that narrows what is on the screen as the user types. ARIA’s searchbox, VoiceOver’s search field trait.

ProgressBar

A control that shows how far work has come and takes no input. ARIA’s progressbar.

ToggleButton

A button that stays pressed or released. ARIA’s button with aria-pressed.

Alert

A message a reader speaks as soon as it shows, with no move to it. ARIA’s alert.

Toolbar

A row of controls that act on the content beside them. ARIA’s toolbar.

Menu

A list of commands that opens on a press. ARIA’s menu.

MenuItem

One command inside a menu. ARIA’s menuitem.

TabBar

The row that holds the tabs of a screen. ARIA’s tablist, VoiceOver’s tab bar trait.

List

A container whose rows a reader counts and walks into. ARIA’s list.

ListItem

One row of a list. ARIA’s listitem.

RadioGroup

A set of mutually exclusive radio choices. ARIA’s radiogroup.

Trait Implementations

impl Clone for SemanticsWidgetRole

fn clone(&self) -> SemanticsWidgetRole

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for SemanticsWidgetRole

impl Debug for SemanticsWidgetRole

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Eq for SemanticsWidgetRole

impl Hash for SemanticsWidgetRole

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for SemanticsWidgetRole

fn eq(&self, other: &SemanticsWidgetRole) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SemanticsWidgetRole