litho-testing/com.facebook.litho.testing.viewtree/ViewTree

ViewTree

class ViewTree

This is a helper class to allow asserting on view trees and recursively verify predicates on its nodes within the narrow abilities that Robolectric affords us.

Functions

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@Nullable
open fun findChild(predicate: Predicate<View>): ImmutableList<View>
Find a view in the hierarchy for which the given predicate is true
@Nullable
open fun findChild(predicate: Predicate<View>, shouldCheckChildren: Predicate<in ViewGroup>): ImmutableList<View>
Find a view in the hierarchy for which the given predicate is true, while only check children of nodes as directed by the additional shouldCheckChildren predicate
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open fun getRoot(): View
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open fun makeString(extraTextFunction: Function<View, String>): String
Generates a string describing the views tree using the views' toString methods and an extra information function.
open fun makeString(startingDepth: Int, extraTextFunction: Function<View, String>): String
Generates a string describing the views tree using the views' toString methods and an extra information function with formatting starting at the given depth.
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open fun of(view: View): ViewTree