SemanticsNodeData class

One node of a serializable, Flutter-free snapshot of a screen's semantics tree.

This mirrors the data Flutter exposes through SemanticsData, reduced to the fields the rules consult. Every rule is a pure function over a tree of these.

Annotations

• @immutable

Constructors

SemanticsNodeData({required int id, String? identifier, String label = '', String value = '', String hint = '', String tooltip = '', Set<SemanticsFlagData> flags = const {}, Set<SemanticsActionData> actions = const {}, RectData bounds = RectData.zero, TextDirectionData textDirection = TextDirectionData.ltr, List<SemanticsNodeData> childrenInTraversalOrder = const [], SourceLocation? creator, TextStyleData? textStyle})

Creates a SemanticsNodeData.

const

SemanticsNodeData.fromJson(Map<String, dynamic> json)

Parses a SemanticsNodeData tree from json.

factory

Properties

actions → Set<SemanticsActionData>

The actions this node can perform.

final

bounds → RectData

The node's bounding rectangle in global logical pixels.

final

childrenInTraversalOrder → List<SemanticsNodeData>

This node's children, in the order assistive technology traverses them.

final

creator → SourceLocation?

Where the originating widget was created, when available.

final

flags → Set<SemanticsFlagData>

The boolean semantic properties set on this node.

final

hashCode → int

The hash code for this object.

no setter, override

hint → String

A hint describing what happens when the node is acted upon.

final

id → int

A stable identifier for this node, unique within its snapshot.

final

identifier → String?

The developer-assigned semantics identifier, from SemanticsProperties.identifier, when one was set.

final

isInteractive → bool

Whether this node is interactive: it is a button or link, or it responds to a tap or long press.

no setter

label → String

The node's accessible name, as a screen reader would announce it.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

selfAndDescendants → Iterable<SemanticsNodeData>

This node and all of its descendants, in pre-order (self first).

no setter

textDirection → TextDirectionData

The reading direction in effect for this node.

final

textStyle → TextStyleData?

The text style, populated only when this node paints text.

final

tooltip → String

The node's tooltip, if any.

final

value → String

The node's current value (e.g. the text in a field, a slider's value).

final

Methods

hasAction(SemanticsActionData action) → bool

Whether this node can perform the given action.

hasFlag(SemanticsFlagData flag) → bool

Whether this node has the given flag.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toJson() → Map<String, dynamic>

The JSON representation of this node and its subtree.

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

override