Compose Runtime

An Applier is responsible for applying the tree-based operations that get emitted during a composition.

Implementations of this interface can be used to cancel an ongoing operation or unregister a listener by calling cancel.

Observes lifecycle of the node emitted with ReusableComposeNode or ComposeNode inside ReusableContentHost and ReusableContent.

Composer is the interface that is targeted by the Compose Kotlin compiler plugin and used by code generation helpers.

A composition object is usually constructed for you, and returned from an API that is used to initially compose a UI.

A CompositionData is the data tracked by the composer during composition.

Provides a way to attach a compose stack trace to a throwable based on a location of compose node in composition.

CompositionGroup is a group of data slots tracked independently by composition.

CompositionInstance provides information about the composition of which a CompositionData is part.

A read-only, immutable snapshot of the CompositionLocalsCompositionLocal that are set at a specific position in the composition hierarchy.

Observe RecomposeScope management inside composition.

The handle returned by [Composition.

Observe when new compositions are added to a recomposer.

A key to locate a service using the CompositionServices interface optionally implemented by implementations of Composition.

Allows finding composition services from the runtime.

A controlled composition is a Composition that can be directly controlled by the caller.

A value holder where reads to the doubleValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A value holder where reads to the floatValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A type-safe identifier used to define a key for retrieving default values from the hosting environment.

An interface that allows the hosting environment (e.

Interface providing a value to identify a scope for tooling.

A value holder where reads to the intValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A value holder where reads to the longValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

Provides a time source for display frames and the ability to perform an action on the next frame.

A value holder where reads to the doubleValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A value holder where reads to the floatValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A value holder where reads to the intValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A value holder where reads to the longValue property during the execution of a Composable function cause the current RecomposeScope to subscribe to changes of that value.

A mutable value holder where reads to the value property during the execution of a Composable function, the current RecomposeScope will be subscribed to changes of that value.

A composition instance that supports observing lifecycle of its RecomposeScope.

The type returned by observer registration methods that unregisters the observer when it is disposed.

A PausableComposition is a sub-composition that can be composed incrementally as it supports being paused and resumed.

PausedComposition is the result of calling [PausableComposition.

Receiver scope for use with produceState.

Represents a recomposable scope or section of the composition hierarchy.

Read only information about Recomposer error state.

Read-only information about a Recomposer.

Objects implementing this interface are notified when they are initially used in a composition and when they are no longer being used.

A ReusableComposition is a Composition that can be reused for different composable content.

Internal compose compiler plugin API that is used to update the function the composer will call to recompose a recomposition scope.

The callback type used in [PausedComposition.

A CoroutineContext element that enters[Snapshot.

A mutable value holder where reads to the value property during the execution of a Composable function, the current RecomposeScope will be subscribed to changes of that value.

A policy to control how the result of mutableStateOf report and merge changes to the state object.

An observer for the snapshot system that notifies an observer when a snapshot is created, applied, and/or disposed.

A value holder where reads to the value property during the execution of a Composable function, the current RecomposeScope will be subscribed to changes of that value.

Interface implemented by all snapshot aware state objects.

An Android-specific HostDefaultKey that identifies values stored within the View hierarchy using Resource ID tags.