# ViewPager.PageTransformer

Artifact: [androidx.viewpager:viewpager](https://developer.android.com/jetpack/androidx/releases/viewpager) [View Source](https://cs.android.com/search?q=file:androidx/viewpager/widget/ViewPager.java+class:androidx.viewpager.widget.ViewPager.PageTransformer) Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/viewpager#1.1.0)

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```
public interface ViewPager.PageTransformer
```

<br />

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A PageTransformer is invoked whenever a visible/attached page is scrolled. This offers an opportunity for the application to apply a custom transformation to the page views using animation properties.

As property animation is only supported as of Android 3.0 and forward, setting a PageTransformer on a ViewPager on earlier platform versions will be ignored.

## Summary

| ### Public methods |
|---|---|
| `abstract void` | `https://developer.android.com/reference/androidx/viewpager/widget/ViewPager.PageTransformer#transformPage(android.view.View,float)(@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/android/view/View.html page, float position)` Apply a property transformation to the given page. |

## Public methods

### transformPage

Added in [1.1.0](https://developer.android.com/jetpack/androidx/releases/viewpager#1.1.0)

```
abstract void transformPage(@NonNull View page, float position)
```

Apply a property transformation to the given page.

| Parameters |
|---|---|
| `@https://developer.android.com/reference/androidx/annotation/NonNull https://developer.android.com/reference/android/view/View.html page` | Apply the transformation to this page |
| `float position` | Position of page relative to the current front-and-center position of the pager. 0 is front and center. 1 is one full page position to the right, and -1 is one page position to the left. |