Element

interface Element : Modifier
androidx.ui.core.Modifier.Element

A single element contained within a Modifier chain.

Summary

Public methods

open R
foldIn(initial: R, operation: (R, Modifier.Element) -> R)

Accumulates a value starting with initial and applying operation to the current value and each element from outside in.

open R
foldOut(initial: R, operation: (Modifier.Element, R) -> R)

Accumulates a value starting with initial and applying operation to the current value and each element from inside out.

Inherited functions

Public methods

foldIn

open fun <R> foldIn(
    initial: R,
    operation: (R, Modifier.Element) -> R
): R

Accumulates a value starting with initial and applying operation to the current value and each element from outside in.

Elements wrap one another in a chain from left to right; an Element that appears to the left of another in a wraps expression or in operation's parameter order affects all of the elements that appear after it. foldIn may be used to accumulate a value starting from the parent or head of the modifier chain to the final wrapped child.

foldOut

open fun <R> foldOut(
    initial: R,
    operation: (Modifier.Element, R) -> R
): R

Accumulates a value starting with initial and applying operation to the current value and each element from inside out.

Elements wrap one another in a chain from left to right; an Element that appears to the left of another in a wraps expression or in operation's parameter order affects all of the elements that appear after it. foldOut may be used to accumulate a value starting from the child or tail of the modifier chain up to the parent or head of the chain.