Element

Kotlin |Java

interface Element : Modifier

androidx.compose.ui.Modifier.Element

Known Direct Subclasses DrawModifier, FocusEventModifier, FocusOrderModifier, FocusRequesterModifier, LayoutModifier, OnGloballyPositionedModifier, OnRemeasuredModifier, ParentDataModifier, RemeasurementModifier, SemanticsModifier DrawModifier A Modifier.Element that draws into the space of the layout. FocusEventModifier A modifier that can be used to observe focus state events. FocusOrderModifier A modifier that can be used to set a custom focus traversal order. FocusRequesterModifier A modifier that can be used to pass in a FocusRequester that can be used to request focus state changes. LayoutModifier A Modifier.Element that changes how its wrapped content is measured and laid out. OnGloballyPositionedModifier A modifier whose onGloballyPositioned is called with the final LayoutCoordinates of the Layout when the global position of the content may have changed. OnRemeasuredModifier A modifier whose onRemeasured is called when the layout content is remeasured. ParentDataModifier A Modifier that provides data to the parent Layout. RemeasurementModifier A Modifier.Element that provides a Remeasurement object associated with the layout node the modifier is applied to. SemanticsModifier A Modifier.Element that adds semantics key/value for use in testing, accessibility, and similar use cases.

Known Indirect Subclasses DrawCacheModifier DrawCacheModifier DrawModifier implementation that supports building a cache of objects to be referenced across draw calls

A single element contained within a Modifier chain.

Summary

Public methods
open Boolean	all(predicate: (Modifier.Element) -> Boolean) Returns true if predicate returns true for all Elements in this Modifier or if this Modifier contains no Elements.
open Boolean	any(predicate: (Modifier.Element) -> Boolean) Returns true if predicate returns true for any Element in this Modifier.
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
From class Modifier Modifier then(other: Modifier) Concatenates this modifier with another. Returns a Modifier representing this modifier followed by other in sequence.

Public methods

all

open fun all(predicate: (Modifier.Element) -> Boolean): Boolean

Returns true if predicate returns true for all Elements in this Modifier or if this Modifier contains no Elements.

any

open fun any(predicate: (Modifier.Element) -> Boolean): Boolean

Returns true if predicate returns true for any Element in this Modifier.

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 + 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 + 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.