MutableTransform

Artifact: androidx.compose.animation:animation

Cmn

@ExperimentalDeferredTransitionApi
class MutableTransform

An object that allows manual manipulation of the visual transformations (alpha, scale, offset, etc.) of content during the deferred phase (initiated by DeferredTransitionState.defer) of a DeferredTransition (e.g., for predictive back gestures).

Manual transformations defined in this object are applied on top of the transition's initial state.

This object provides an invoke operator that accepts a TransformScope lambda. This lambda is evaluated repeatedly to ensure that state reads (e.g., from gesture progress) are deferred to the layout phase, preventing unnecessary composition churn while keeping Draw-phase operations performant.

Values set in this object are seamlessly handed off to the automatic transition animation when the deferred phase ends.

Summary

Public constructors
`MutableTransform( veilMatchParentSize: Boolean, offsetVelocityProvider: (() -> Offset)?, block: (TransformScope.(fullSize: IntSize) -> Unit)? )`	Cmn

Public functions
`operator Unit`	`invoke(block: TransformScope.(fullSize: IntSize) -> Unit)` Define the manual transformation to apply during the deferred phase.	Cmn

Public constructors

MutableTransform

Cmn

Added in 1.12.0-alpha03

MutableTransform(
    veilMatchParentSize: Boolean = false,
    offsetVelocityProvider: (() -> Offset)? = null,
    block: (TransformScope.(fullSize: IntSize) -> Unit)? = null
)

Parameters
`veilMatchParentSize: Boolean = false`	Whether the veil should match the size of the parent.
`offsetVelocityProvider: (() -> Offset)? = null`	The velocity of the offset change in pixels/sec. The `offsetVelocityProvider` lambda is evaluated exactly once when the deferred phase ends to ensure a seamless handoff to the automatic transition.
`block: (TransformScope.(fullSize: IntSize) -> Unit)? = null`	A lambda that applies transformations to the provided `TransformScope`. This block executes dynamically to reflect state changes.

Public functions

invoke

Cmn

Added in 1.12.0-alpha03

operator fun invoke(block: TransformScope.(fullSize: IntSize) -> Unit): Unit

Define the manual transformation to apply during the deferred phase.

Parameters
`block: TransformScope.(fullSize: IntSize) -> Unit`	A lambda that applies transformations to the provided `TransformScope`. This block executes dynamically to reflect state changes.