com.facebook.litho.widget

Class SelectorComponent

java.lang.Object

com.facebook.litho.ComponentLifecycle

com.facebook.litho.Component

com.facebook.litho.widget.SelectorComponent

All Implemented Interfaces:

Equivalence<Component>, EventDispatcher, EventTriggerTarget, HasEventDispatcher, HasEventTrigger, Cloneable

public final class SelectorComponent
extends Component

Selects the first Component that will render by calling Component.willRender(ComponentContext, Component) on the Components provided.

This is useful when a single Component is to be rendered amongst a large number of candidate Components or when multiple Components can potentially render some content using the same props and the first one capable of rendering the content needs to be used.

See Also:

com.facebook.litho.widget.SelectorComponentSpec

Optional Props

components

Type:

java.util.List

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	SelectorComponent.Builder

Nested classes/interfaces inherited from class com.facebook.litho.Component

Component.ContainerBuilder<T extends Component.ContainerBuilder<T>>

Nested classes/interfaces inherited from class com.facebook.litho.ComponentLifecycle

ComponentLifecycle.MountType, ComponentLifecycle.RenderData, ComponentLifecycle.StateUpdate, ComponentLifecycle.TransitionContainer

Field Summary

Fields inherited from class com.facebook.litho.Component

mLastMeasuredLayoutThreadLocal, mSplitChildrenLayoutInThreadPool

Method Summary

Modifier and Type	Method and Description
static SelectorComponent.Builder	create(ComponentContext context)
static SelectorComponent.Builder	create(ComponentContext context, int defStyleAttr, int defStyleRes)
boolean	isEquivalentTo(Component other) Compares this component to a different one to check if they are the same
protected Component	onCreateLayout(ComponentContext c) Generate a tree of ComponentLayout representing the layout structure of the Component and its sub-components.

Methods inherited from class com.facebook.litho.Component

canResolve, clearCachedLayout, copyInterStageImpl, getCommonProps, getEventDispatcher, getId, getScopedContext, getSimpleName, getStateContainer, makeShallowCopy, measure, recordEventTrigger, registerWorkingRange, releaseCachedLayout, setScopedContext, updateInternalChildState, updateInternalChildState, willRender

Methods inherited from class com.facebook.litho.ComponentLifecycle

acceptTriggerEvent, acquireDiff, acquireOutput, applyPreviousRenderData, callsShouldUpdateOnMount, canMeasure, canPreallocate, createInitialState, createMountContent, dispatchErrorEvent, dispatchErrorEvent, dispatchOnEnteredRange, dispatchOnEvent, dispatchOnExitedRange, getEventTrigger, getExtraAccessibilityNodeAt, getExtraAccessibilityNodesCount, getMountType, getTreePropsForChildren, hasChildLithoViews, hasState, implementsAccessibility, implementsExtraAccessibilityNodes, isLayoutSpecWithSizeSpecCheck, isMountSizeDependent, isPureRender, needsPreviousRenderData, newEventHandler, newEventHandler, newEventTrigger, onBind, onBoundsDefined, onCreateLayoutWithSizeSpec, onCreateMountContent, onCreateMountContentPool, onCreateTransition, onError, onLoadStyle, onMeasure, onMeasureBaseline, onMount, onPopulateAccessibilityNode, onPopulateExtraAccessibilityNode, onPrepare, onShouldCreateLayoutWithNewSizeSpec, onUnbind, onUnmount, poolSize, populateTreeProps, recordRenderData, releaseDiff, releaseOutput, resolve, shouldAlwaysRemeasure, shouldUpdate, shouldUseDisplayList, transferState

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

isEquivalentTo

public boolean isEquivalentTo(Component other)

Description copied from class: Component

Compares this component to a different one to check if they are the same

This is used to be able to skip rendering a component again. We avoid using the Object.equals(Object) so we can optimize the code better over time since we don't have to adhere to the contract required for a equals method.

Specified by:

isEquivalentTo in interface Equivalence<Component>

Overrides:

isEquivalentTo in class Component

Parameters:

other - the component to compare to

Returns:

true if the components are of the same type and have the same props

onCreateLayout

protected Component onCreateLayout(ComponentContext c)

Description copied from class: ComponentLifecycle

Generate a tree of ComponentLayout representing the layout structure of the Component and its sub-components. You should use ComponentContext.newLayoutBuilder(int, int) to build the layout tree.

Overrides:

onCreateLayout in class ComponentLifecycle

Parameters:

c - The ComponentContext to build a ComponentLayout tree.

create

public static SelectorComponent.Builder create(ComponentContext context)

create

public static SelectorComponent.Builder create(ComponentContext context,
                                               int defStyleAttr,
                                               int defStyleRes)