[android-components](../../index.md) / [mozilla.components.browser.toolbar.behavior](../index.md) / [BrowserToolbarBottomBehavior](index.md) / [onNestedPreScroll](./on-nested-pre-scroll.md)

# onNestedPreScroll

`fun onNestedPreScroll(coordinatorLayout: CoordinatorLayout, child: `[`BrowserToolbar`](../../mozilla.components.browser.toolbar/-browser-toolbar/index.md)`, target: `[`View`](https://developer.android.com/reference/android/view/View.html)`, dx: `[`Int`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, dy: `[`Int`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`, consumed: `[`IntArray`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int-array/index.html)`, type: `[`Int`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-int/index.html)`): `[`Unit`](https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-unit/index.html) [(source)](https://github.com/mozilla-mobile/android-components/blob/master/components/browser/toolbar/src/main/java/mozilla/components/browser/toolbar/behavior/BrowserToolbarBottomBehavior.kt#L80)