core/androidx.core.view/[main]NestedScrollingParent

NestedScrollingParent

interface NestedScrollingParent(source)

This interface should be implemented by ViewGroup subclasses that wish to support scrolling operations delegated by a nested child view.

Classes implementing this interface should create a final instance of a NestedScrollingParentHelper as a field and delegate any View or ViewGroup methods to the NestedScrollingParentHelper methods of the same signature.

Views invoking nested scrolling functionality should always do so from the relevant ViewCompat, ViewGroupCompat or ViewParentCompat compatibility shim static methods. This ensures interoperability with nested scrolling views on Android 5.0 Lollipop and newer.

Inheritors

Functions

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abstract fun getNestedScrollAxes(): Int
Return the current axes of nested scrolling for this NestedScrollingParent.
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abstract fun onNestedFling(@NonNull target: @NonNull View, velocityX: Float, velocityY: Float, consumed: Boolean): Boolean
Request a fling from a nested scroll.
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abstract fun onNestedPreFling(@NonNull target: @NonNull View, velocityX: Float, velocityY: Float): Boolean
React to a nested fling before the target view consumes it.
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abstract fun onNestedPreScroll(@NonNull target: @NonNull View, dx: Int, dy: Int, consumed: @NonNull Array<Int>)
React to a nested scroll in progress before the target view consumes a portion of the scroll.
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abstract fun onNestedScroll(@NonNull target: @NonNull View, dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int)
React to a nested scroll in progress.
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abstract fun onNestedScrollAccepted(@NonNull child: @NonNull View, @NonNull target: @NonNull View, axes: Int)
React to the successful claiming of a nested scroll operation.
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abstract fun onStartNestedScroll(@NonNull child: @NonNull View, @NonNull target: @NonNull View, axes: Int): Boolean
React to a descendant view initiating a nestable scroll operation, claiming the nested scroll operation if appropriate.
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abstract fun onStopNestedScroll(@NonNull target: @NonNull View)
React to a nested scroll operation ending.