SemanticsNode class - semantics library

Constructors

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

Properties

childrenCount → int: The number of children this node has.
read-only
decreasedValue → String: The value that value will have after a SemanticsAction.decrease action has been performed. [...]
read-only
hasChildren → bool: Whether this node has a non-zero number of children.
read-only
hint → String: A brief description of the result of performing an action on this node. [...]
read-only
hintOverrides → SemanticsHintOverrides: Provides hint values which override the default hints on supported platforms.
read-only
id → int: The unique identifier for this node. [...]
final
increasedValue → String: The value that value will have after a SemanticsAction.increase action has been performed. [...]
read-only
indexInParent ↔ int: The index of this node within the parent's list of semantic children. [...]
read / write
isInvisible → bool: Whether the node is invisible. [...]
read-only
isMergedIntoParent ↔ bool: Whether this node merges its semantic information into an ancestor node.
read / write
isPartOfNodeMerging → bool: Whether this node is taking part in a merge of semantic information. [...]
read-only
key → Key: Uniquely identifies this node in the list of sibling nodes. [...]
final
label → String: A textual description of this node. [...]
read-only
mergeAllDescendantsIntoThisNode → bool: Whether this node and all of its descendants should be treated as one logical entity.
read-only
owner → SemanticsOwner: The owner for this node (null if unattached). [...]
read-only, override
parent → SemanticsNode: The parent of this node in the tree.
read-only, override
parentPaintClipRect ↔ Rect: The paint clip from an ancestor that was applied to this node. [...]
read / write
parentSemanticsClipRect ↔ Rect: The semantic clip from an ancestor that was applied to this node. [...]
read / write
rect ↔ Rect: The bounding box for this node in its coordinate system.
read / write
scrollChildCount → int: The total number of scrollable children that contribute to semantics. [...]
read-only
scrollExtentMax → double: Indicates the maximum in-range value for scrollPosition if the node is scrollable. [...]
read-only
scrollExtentMin → double: Indicates the minimum in-range value for scrollPosition if the node is scrollable. [...]
read-only
scrollIndex → int: The index of the first visible semantic child of a scroll node.
read-only
scrollPosition → double: Indicates the current scrolling position in logical pixels if the node is scrollable. [...]
read-only
sortKey → SemanticsSortKey: Determines the position of this node among its siblings in the traversal sort order. [...]
read-only
tags ↔ Set<SemanticsTag>: The SemanticsTags this node is tagged with. [...]
read / write
textDirection → TextDirection: The reading direction for label, value, hint, increasedValue, and decreasedValue.
read-only
textSelection → TextSelection: The currently selected text (or the position of the cursor) within value if this node represents a text field.
read-only
transform ↔ Matrix4: The transform from this node's coordinate system to its parent's coordinate system. [...]
read / write
value → String: A textual description for the current value of the node. [...]
read-only
attached → bool: Whether this node is in a tree whose root is attached to something. [...]
read-only, inherited
depth → int: The depth of this node in the tree. [...]
read-only, inherited
hashCode → int: The hash code for this object. [...]
read-only, inherited
runtimeType → Type: A representation of the runtime type of the object.
read-only, inherited

Methods

attach(covariant SemanticsOwner owner) → void: Mark this node as attached to the given owner. [...]
override
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. [...]
override
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.
redepthChildren() → void: Adjust the depth of this node's children, if any. [...]
override
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 toStringDeep. [...]
override
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug, DebugSemanticsDumpOrder childOrder: DebugSemanticsDumpOrder.traversalOrder }) → String: Returns a string representation of this node and its descendants. [...]
override
toStringShort() → String: A brief description of this object, usually just the runtimeType and the hashCode. [...]
override
updateWith({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. [...]
adoptChild(covariant AbstractNode child) → void: Mark the given node as being a child of this node. [...]
@mustCallSuper, @protected, inherited
dropChild(covariant AbstractNode child) → void: Disconnect the given node from this node. [...]
@mustCallSuper, @protected, inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a non-existent method or property is accessed. [...]
inherited
redepthChild(AbstractNode child) → void: Adjust the depth of the given child to be greater than this node's own depth. [...]
@protected, inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String: Returns a string representation of this object.
inherited
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String: Returns a one-line detailed description of the object. [...]
inherited

Operators

operator ==(dynamic other) → bool: The equality operator. [...]
inherited