Interface
Android
```kotlin
public interface TransformationSpec
```
Defines visual transformations on the items of a `TransformingLazyColumn`.
When using this API, users need to make similar changes between all of the functions. For
example, if `getTransformedHeight` returns half of the size of the item, then transformation
functions should do the same, scaling or cropping the item.
`getTransformedHeight` is called first, then the painter would be created and then container and
content transformations are applied.
This shows how to create a custom transformation spec for the `TransformingLazyColumn`.
This shows how to apply different `androidx.compose.ui.graphics.CompositingStrategy` with
`TransformationSpec` for the `TransformingLazyColumn`.
This shows how to apply the `TransformationSpec` to custom component inside
`TransformingLazyColumn`.
## Functions
```kotlin
public fun getTransformedHeight(
measuredHeight: Int,
scrollProgress: TransformingLazyColumnItemScrollProgress,
): Int
```
Calculates the transformed height to be passed into
`TransformingLazyColumnItemScope.transformedHeight` based on the parameters for the spec.
#### Parameters
| | |
| --- | --- |
| measuredHeight | The height in pixels of the item returned during measurement. |
| scrollProgress | The scroll progress of the item. |
applyContentTransformation
```kotlin
public fun GraphicsLayerScope.applyContentTransformation(
scrollProgress: TransformingLazyColumnItemScrollProgress
)
```
Visual transformations to be applied to the content of the item as it scrolls.
#### Parameters
| | |
| --- | --- |
| scrollProgress | The scroll progress of the item. |
```kotlin
public fun GraphicsLayerScope.applyContainerTransformation(
scrollProgress: TransformingLazyColumnItemScrollProgress
)
```
Visual transformations to be applied to the container of the item as it scrolls.
#### Parameters
| | |
| --- | --- |
| scrollProgress | The scroll progress of the item. |
```kotlin
public fun TransformedContainerPainterScope.createTransformedContainerPainter(
painter: Painter,
shape: Shape,
border: BorderStroke?,
): Painter
```
Returns a new painter to be used instead of `painter` which should react on a transformation.
#### Parameters
| | |
| --- | --- |
| painter | The painter to be transformed. This is the original `Painter` the component was trying to use. |
| shape | The shape of the item's container. |
| border | The border of the item's container. |