SemanticsNode

Kotlin |Java

class SemanticsNode

kotlin.Any
↳	androidx.compose.ui.semantics.SemanticsNode

A list of key/value pairs associated with a layout node or its subtree.

Each SemanticsNode takes its id and initial key/value list from the outermost modifier on one layout node. It also contains the "collapsed" configuration of any other semantics modifiers on the same layout node, and if "mergeDescendants" is specified and enabled, also the "merged" configuration of its subtree.

Summary

Public methods
Int	getAlignmentLinePosition(alignmentLine: AlignmentLine) Returns the position of an alignment line, or AlignmentLine.Unspecified if the line is not provided.

Properties
Rect	boundsInRoot The bounding box for this node relative to the root of this Compose hierarchy, with clipping applied.
Rect	boundsInWindow The bounding box for this node relative to the screen, with clipping applied.
List<SemanticsNode>	children Contains the children in inverse hit test order (i.
SemanticsConfiguration	config The list of semantics properties of this node.
Int	id
Boolean	isRoot Whether this SemanticNode is the root of a tree or not
LayoutInfo	layoutInfo The LayoutInfo that this is associated with.
Boolean	mergingEnabled mergingEnabled specifies whether mergeDescendants config has any effect.
SemanticsNode?	parent The parent of this node in the tree.
Offset	positionInRoot The position of this node relative to the root of this Compose hierarchy, with no clipping applied
Offset	positionInWindow The position of this node relative to the screen, with no clipping applied
RootForTest?	root The root this node is attached to.
IntSize	size The size of the bounding box for this node, with no clipping applied

Public methods

getAlignmentLinePosition

fun getAlignmentLinePosition(alignmentLine: AlignmentLine): Int

Returns the position of an alignment line, or AlignmentLine.Unspecified if the line is not provided.

Properties

boundsInRoot

val boundsInRoot: Rect

The bounding box for this node relative to the root of this Compose hierarchy, with clipping applied. To get the bounds with no clipping applied, use Rect(positionInRoot, size.toSize())

boundsInWindow

val boundsInWindow: Rect

The bounding box for this node relative to the screen, with clipping applied. To get the bounds with no clipping applied, use PxBounds(positionInWindow, size.toSize())

children

val children: List<SemanticsNode>

Contains the children in inverse hit test order (i.e. paint order).

Note that if mergingEnabled and mergeDescendants are both true, then there are no children (except those that are themselves mergeDescendants).

config

val config: SemanticsConfiguration

The list of semantics properties of this node.

This includes all properties attached as modifiers to the current layout node. In addition, if mergeDescendants and mergingEnabled are both true, then it also includes the semantics properties of descendant nodes.

id

val id: Int

isRoot

val isRoot: Boolean

Whether this SemanticNode is the root of a tree or not

layoutInfo

val layoutInfo: LayoutInfo

The LayoutInfo that this is associated with.

mergingEnabled

val mergingEnabled: Boolean

mergingEnabled specifies whether mergeDescendants config has any effect.

If true, then mergeDescendants nodes will merge up all properties from child semantics nodes and remove those children from "children", with the exception of nodes that themselves have mergeDescendants. If false, then mergeDescendants has no effect.

mergingEnabled is typically true or false consistently on every node of a SemanticsNode tree.

parent

val parent: SemanticsNode?

The parent of this node in the tree.

positionInRoot

val positionInRoot: Offset

The position of this node relative to the root of this Compose hierarchy, with no clipping applied

positionInWindow

val positionInWindow: Offset

The position of this node relative to the screen, with no clipping applied

root

val root: RootForTest?

The root this node is attached to.

size

val size: IntSize

The size of the bounding box for this node, with no clipping applied