CompositionGroup

CompositionGroup is a group of data slots tracked independently by composition. These groups correspond to flow control branches (such as if statements and function calls) as well as emitting of a node to the tree.

This interface is not intended to be used directly and is provided to allow the tools API to have access to data tracked during composition. The tools API should be used instead which provides a more usable interpretation of the slot table.

Summary

Public properties
Iterable<Any?>

The data stored in the slot table for this group.
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open Int

The total number of groups, including itself, that this group contains.
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open Any?

A value that identifies a Group independently of movement caused by recompositions.
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Any

A value used to identify the group within its siblings and is typically a compiler generated integer but can be an object if the key composable is used.
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Any?

If the group represents a node this returns a non-null value which is the node that was emitted for the group.
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open Int
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String?

Information recorded by the compiler to help tooling identify the source that generated the group.
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Extension functions
List<ParameterInformation>

Return the parameters found for this CompositionGroup.
android

Inherited functions
From androidx.compose.runtime.tooling.CompositionData
open CompositionGroup?
find(identityToFind: Any)

Find a sub-group by identity.
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Inherited properties
From androidx.compose.runtime.tooling.CompositionData
Iterable<CompositionGroup>

Iterate the composition data in the group.
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Boolean

Returns true if no composition data has been collected.
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Public properties

data

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Added in 1.0.0
val data: Iterable<Any?>

The data stored in the slot table for this group. This information includes the values stored for parameters that are checked for change, any value passed as a parameter for androidx.compose.runtime.remember and the last value returned by androidx.compose.runtime.remember, etc.

groupSize

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Added in 1.4.0
open val groupSize: Int

The total number of groups, including itself, that this group contains.

identity

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Added in 1.2.0
open val identity: Any?

A value that identifies a Group independently of movement caused by recompositions.

key

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Added in 1.0.0
val key: Any

A value used to identify the group within its siblings and is typically a compiler generated integer but can be an object if the key composable is used.

node

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Added in 1.0.0
val node: Any?

If the group represents a node this returns a non-null value which is the node that was emitted for the group.

slotsSize

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Added in 1.4.0
open val slotsSize: Int

sourceInfo

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Added in 1.0.0
val sourceInfo: String?

Information recorded by the compiler to help tooling identify the source that generated the group. The format of this string is internal and is interpreted by the tools API which translates this information into source file name and offsets.

Extension functions

findParameters

android 
@UiToolingDataApi
fun CompositionGroup.findParameters(cache: ContextCache? = null): List<ParameterInformation>

Return the parameters found for this CompositionGroup.