SemanticsNode class - semantics library

Constructors

SemanticsNode({Key? key, VoidCallback? showOnScreen}): Creates a semantic node.
SemanticsNode.root({Key? key, VoidCallback? showOnScreen, required SemanticsOwner owner}): Creates a semantic node to represent the root of the semantics tree.

Properties

areUserActionsBlocked ↔ bool: Whether the user can interact with this node in assistive technologies.
getter/setter pair
attached → bool: Whether the semantics tree this node belongs to is attached to a SemanticsOwner.
no setter
attributedDecreasedValue → AttributedString: The value in AttributedString format that value or attributedValue will have after a SemanticsAction.decrease action has been performed.
no setter
attributedHint → AttributedString: A brief description of the result of performing an action on this node in AttributedString format.
no setter
attributedIncreasedValue → AttributedString: The value in AttributedString format that value or attributedValue will have after a SemanticsAction.increase action has been performed.
no setter
attributedLabel → AttributedString: A textual description of this node in AttributedString format.
no setter
attributedValue → AttributedString: A textual description for the current value of the node in AttributedString format.
no setter
childrenCount → int: The number of children this node has.
no setter
currentValueLength → int?: The current number of characters that have been entered into an editable text field.
no setter
decreasedValue → String: The value that value will have after a SemanticsAction.decrease action has been performed.
no setter
depth → int: The depth of this node in the semantics tree.
no setter
elevation → double: The elevation along the z-axis at which the rect of this SemanticsNode is located above its parent.
no setter
elevationAdjustment ↔ double?: The elevation adjustment that the parent imposes on this node.
getter/setter pair
hasChildren → bool: Whether this node has a non-zero number of children.
no setter
hashCode → int: The hash code for this object.
no setterinherited
headingLevel → int: The level of the widget as a heading within the structural hierarchy of the screen. A value of 1 indicates the highest level of structural hierarchy. A value of 2 indicates the next level, and so on.
no setter
hint → String: A brief description of the result of performing an action on this node.
no setter
hintOverrides → SemanticsHintOverrides?: Provides hint values which override the default hints on supported platforms.
no setter
id → int: The unique identifier for this node.
no setter
identifier → String: Provides an identifier for the semantics node in native accessibility hierarchy.
no setter
increasedValue → String: The value that value will have after a SemanticsAction.increase action has been performed.
no setter
indexInParent ↔ int?: The index of this node within the parent's list of semantic children.
getter/setter pair
isInvisible → bool: Whether the node is invisible.
no setter
isMergedIntoParent → bool: Whether this node merges its semantic information into an ancestor node.
no setter
isMultiline → bool?: If this node represents a text field, this indicates whether or not it's a multiline text field.
no setter
isPartOfNodeMerging → bool: Whether this node is taking part in a merge of semantic information.
no setter
key → Key?: Uniquely identifies this node in the list of sibling nodes.
final
label → String: A textual description of this node.
no setter
linkUrl → Uri?: The URL that this node links to.
no setter
maxValueLength → int?: The maximum number of characters that can be entered into an editable text field.
no setter
mergeAllDescendantsIntoThisNode → bool: Whether this node and all of its descendants should be treated as one logical entity.
no setter
owner → SemanticsOwner?: The owner for this node (null if unattached).
no setter
parent → SemanticsNode?: The parent of this node in the semantics tree.
no setter
parentPaintClipRect ↔ Rect?: The paint clip from an ancestor that was applied to this node.
getter/setter pair
parentSemanticsClipRect ↔ Rect?: The semantic clip from an ancestor that was applied to this node.
getter/setter pair
platformViewId → int?: The id of the platform view, whose semantics nodes will be added as children to this node.
no setter
rect ↔ Rect: The bounding box for this node in its coordinate system.
getter/setter pair
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
scrollChildCount → int?: The total number of scrollable children that contribute to semantics.
no setter
scrollExtentMax → double?: Indicates the maximum in-range value for scrollPosition if the node is scrollable.
no setter
scrollExtentMin → double?: Indicates the minimum in-range value for scrollPosition if the node is scrollable.
no setter
scrollIndex → int?: The index of the first visible semantic child of a scroll node.
no setter
scrollPosition → double?: Indicates the current scrolling position in logical pixels if the node is scrollable.
no setter
sortKey → SemanticsSortKey?: Determines the position of this node among its siblings in the traversal sort order.
no setter
tags ↔ Set<SemanticsTag>?: The SemanticsTags this node is tagged with.
getter/setter pair
textDirection → TextDirection?: The reading direction for label, value, hint, increasedValue, and decreasedValue.
no setter
textSelection → TextSelection?: The currently selected text (or the position of the cursor) within value if this node represents a text field.
no setter
thickness → double: Describes how much space the SemanticsNode takes up along the z-axis.
no setter
tooltip → String: A textual description of the widget's tooltip.
no setter
transform ↔ Matrix4?: The transform from this node's coordinate system to its parent's coordinate system.
getter/setter pair
value → String: A textual description for the current value of the node.
no setter

Methods

attach(SemanticsOwner owner) → void: Mark this node as attached to the given owner.
debugDescribeChildren({DebugSemanticsDumpOrder childOrder = DebugSemanticsDumpOrder.inverseHitTest}) → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
override
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
override
debugListChildrenInOrder(DebugSemanticsDumpOrder childOrder) → List<SemanticsNode>: Returns the list of direct children of this node in the specified order.
detach() → void: Mark this node as detached from its owner.
getSemanticsData() → SemanticsData: Returns a summary of the semantics for this node.
hasFlag(SemanticsFlag flag) → bool: Whether this node currently has a given SemanticsFlag.
isTagged(SemanticsTag tag) → bool: Whether this node is tagged with tag.
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
sendEvent(SemanticsEvent event) → void: Sends a SemanticsEvent associated with this SemanticsNode.
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style = DiagnosticsTreeStyle.sparse, DebugSemanticsDumpOrder childOrder = DebugSemanticsDumpOrder.traversalOrder}) → DiagnosticsNode: Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep.
override
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) → String: A string representation of this object.
inherited
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, DebugSemanticsDumpOrder childOrder = DebugSemanticsDumpOrder.traversalOrder, int wrapWidth = 65}) → String: Returns a string representation of this node and its descendants.
override
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A brief description of this object, usually just the runtimeType and the hashCode.
override
updateWith({required SemanticsConfiguration? config, List<SemanticsNode>? childrenInInversePaintOrder}) → void: Reconfigures the properties of this object to describe the configuration provided in the config argument and the children listed in the childrenInInversePaintOrder argument.
visitChildren(SemanticsNodeVisitor visitor) → void: Visits the immediate children of this node.

Operators

operator ==(Object other) → bool: The equality operator.
inherited