---
title: "MutableContentTransform"
description: "An object that allows manual manipulation of both entering and exiting content during the deferred phase (initiated by DeferredTransitionState.defer) of an AnimatedContent transition."
type: "class"
lastmod: "2026-05-20T01:13:52.639613Z"
---
## API Reference

> Source set: Common

```kotlin
@ExperimentalDeferredTransitionApi
public class MutableContentTransform(
    initialVeilMatchParentSize: Boolean = false,
    targetVeilMatchParentSize: Boolean = false,
    initialOffsetVelocityProvider: (() -> Offset)? = null,
    targetOffsetVelocityProvider: (() -> Offset)? = null,
    block: MutableContentTransform.() -> Unit = {},
)
```

An object that allows manual manipulation of both entering and exiting content during the
deferred phase (initiated by [DeferredTransitionState.defer](/jetpack-compose/androidx.compose.animation/animation-core/classes/DeferredTransitionState)) of an [AnimatedContent](/jetpack-compose/androidx.compose.animation/animation/composable-functions/AnimatedContent) transition.

#### Parameters

| | |
| --- | --- |
| initialVeilMatchParentSize | Whether the initial content's veil should match the parent size. |
| targetVeilMatchParentSize | Whether the target content's veil should match the parent size. |
| initialOffsetVelocityProvider | The velocity of the offset change for the exiting content in pixels/sec. The `initialOffsetVelocityProvider` lambda is evaluated exactly once when the deferred phase ends to ensure a seamless handoff to the automatic transition. |
| targetOffsetVelocityProvider | The velocity of the offset change for the entering content in pixels/sec. The `targetOffsetVelocityProvider` lambda is evaluated exactly once when the deferred phase ends to ensure a seamless handoff to the automatic transition. |
| block | A configuration block to set up the transformations for initial and target content. |

## Functions

### initialContentTransform

```kotlin
public fun initialContentTransform(block: TransformScope.(fullSize: IntSize) -> Unit)
```

Define the manual transformation to apply to the exiting content during the deferred phase.

#### Parameters

| | |
| --- | --- |
| block | A lambda that applies transformations to the provided [TransformScope](/jetpack-compose/androidx.compose.animation/animation/interfaces/TransformScope). |

### targetContentTransform

```kotlin
public fun targetContentTransform(block: TransformScope.(fullSize: IntSize) -> Unit)
```

Define the manual transformation to apply to the entering content during the deferred phase.

#### Parameters

| | |
| --- | --- |
| block | A lambda that applies transformations to the provided [TransformScope](/jetpack-compose/androidx.compose.animation/animation/interfaces/TransformScope). |