ui-core/com.adyen.checkout.ui.core/AdyenComponentView

AdyenComponentView

class AdyenComponentView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0) : LinearLayout

A View that can display input and fill in details for a Component. Declare this view in your xml layout file and call attach to bind it to a component.

Constructors

AdyenComponentView

@JvmOverloads

constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0)

Functions

addChildrenForAccessibility

open override fun addChildrenForAccessibility(p0: ArrayList<View>)

addExtraDataToAccessibilityNodeInfo

open override fun addExtraDataToAccessibilityNodeInfo(p0: AccessibilityNodeInfo, p1: String, p2: Bundle?)

addFocusables

open fun addFocusables(p0: ArrayList<View>, p1: Int)

open override fun addFocusables(p0: ArrayList<View>, p1: Int, p2: Int)

addKeyboardNavigationClusters

open override fun addKeyboardNavigationClusters(p0: MutableCollection<View>, p1: Int)

addOnAttachStateChangeListener

open fun addOnAttachStateChangeListener(p0: View.OnAttachStateChangeListener)

addOnLayoutChangeListener

open fun addOnLayoutChangeListener(p0: View.OnLayoutChangeListener)

addOnUnhandledKeyEventListener

open fun addOnUnhandledKeyEventListener(p0: View.OnUnhandledKeyEventListener)

addStatesFromChildren

open fun addStatesFromChildren(): Boolean

addTouchables

open override fun addTouchables(p0: ArrayList<View>)

addView

open fun addView(p0: View)

open override fun addView(p0: View, p1: ViewGroup.LayoutParams)

open fun addView(p0: View, p1: Int)

open fun addView(p0: View, p1: Int, p2: ViewGroup.LayoutParams)

open fun addView(p0: View, p1: Int, p2: Int)

animate

open fun animate(): ViewPropertyAnimator

announceForAccessibility

open fun announceForAccessibility(p0: CharSequence)

attach

fun <T : ViewableComponent, Component> attach(component: T, lifecycleOwner: LifecycleOwner)

Attach this view to a component to interact with.

autofill

open fun autofill(p0: SparseArray<AutofillValue>)

open fun autofill(p0: AutofillValue)

bringChildToFront

open override fun bringChildToFront(p0: View)

bringToFront

open fun bringToFront()

buildDrawingCache

open fun ~~buildDrawingCache~~()

open fun ~~buildDrawingCache~~(p0: Boolean)

buildLayer

open fun buildLayer()

callOnClick

open fun callOnClick(): Boolean

cancelDragAndDrop

fun cancelDragAndDrop()

cancelLongPress

open fun cancelLongPress()

cancelPendingInputEvents

fun cancelPendingInputEvents()

canResolveLayoutDirection

open fun canResolveLayoutDirection(): Boolean

canResolveTextAlignment

open fun canResolveTextAlignment(): Boolean

canResolveTextDirection

open fun canResolveTextDirection(): Boolean

canScrollHorizontally

open fun canScrollHorizontally(p0: Int): Boolean

canScrollVertically

open fun canScrollVertically(p0: Int): Boolean

checkInputConnectionProxy

open fun checkInputConnectionProxy(p0: View): Boolean

childDrawableStateChanged

open override fun childDrawableStateChanged(p0: View)

childHasTransientStateChanged

open override fun childHasTransientStateChanged(p0: View, p1: Boolean)

clearAnimation

open fun clearAnimation()

clearChildFocus

open override fun clearChildFocus(p0: View)

clearDisappearingChildren

open fun clearDisappearingChildren()

clearFocus

open override fun clearFocus()

clearPendingCredentialRequest

open fun clearPendingCredentialRequest()

clearViewTranslationCallback

open fun clearViewTranslationCallback()

computeScroll

open fun computeScroll()

computeSystemWindowInsets

open fun computeSystemWindowInsets(p0: WindowInsets, p1: Rect): WindowInsets

createAccessibilityNodeInfo

open fun createAccessibilityNodeInfo(): AccessibilityNodeInfo

createContextMenu

open fun createContextMenu(p0: ContextMenu)

destroyDrawingCache

open fun ~~destroyDrawingCache~~()

dispatchApplyWindowInsets

open override fun dispatchApplyWindowInsets(p0: WindowInsets): WindowInsets

dispatchCapturedPointerEvent

open override fun dispatchCapturedPointerEvent(p0: MotionEvent): Boolean

dispatchConfigurationChanged

open override fun dispatchConfigurationChanged(p0: Configuration)

dispatchCreateViewTranslationRequest

open override fun dispatchCreateViewTranslationRequest(p0: MutableMap<AutofillId, LongArray>, p1: IntArray, p2: TranslationCapability, p3: MutableList<ViewTranslationRequest>)

dispatchDisplayHint

open override fun dispatchDisplayHint(p0: Int)

dispatchDragEvent

open override fun dispatchDragEvent(p0: DragEvent): Boolean

dispatchDrawableHotspotChanged

open override fun dispatchDrawableHotspotChanged(p0: Float, p1: Float)

dispatchFinishTemporaryDetach

open override fun dispatchFinishTemporaryDetach()

dispatchGenericMotionEvent

open fun dispatchGenericMotionEvent(p0: MotionEvent): Boolean

dispatchKeyEvent

open override fun dispatchKeyEvent(p0: KeyEvent): Boolean

dispatchKeyEventPreIme

open override fun dispatchKeyEventPreIme(p0: KeyEvent): Boolean

dispatchKeyShortcutEvent

open override fun dispatchKeyShortcutEvent(p0: KeyEvent): Boolean

dispatchNestedFling

open fun dispatchNestedFling(p0: Float, p1: Float, p2: Boolean): Boolean

dispatchNestedPreFling

open fun dispatchNestedPreFling(p0: Float, p1: Float): Boolean

dispatchNestedPrePerformAccessibilityAction

open fun dispatchNestedPrePerformAccessibilityAction(p0: Int, p1: Bundle?): Boolean

dispatchNestedPreScroll

open fun dispatchNestedPreScroll(p0: Int, p1: Int, p2: IntArray?, p3: IntArray?): Boolean

dispatchNestedScroll

open fun dispatchNestedScroll(p0: Int, p1: Int, p2: Int, p3: Int, p4: IntArray?): Boolean

dispatchPointerCaptureChanged

open override fun dispatchPointerCaptureChanged(p0: Boolean)

dispatchPopulateAccessibilityEvent

open fun dispatchPopulateAccessibilityEvent(p0: AccessibilityEvent): Boolean

dispatchProvideAutofillStructure

open override fun dispatchProvideAutofillStructure(p0: ViewStructure, p1: Int)

dispatchProvideStructure

open override fun dispatchProvideStructure(p0: ViewStructure)

dispatchScrollCaptureSearch

open override fun dispatchScrollCaptureSearch(p0: Rect, p1: Point, p2: Consumer<ScrollCaptureTarget>)

dispatchSetActivated

open override fun dispatchSetActivated(p0: Boolean)

dispatchSetSelected

open override fun dispatchSetSelected(p0: Boolean)

dispatchStartTemporaryDetach

open override fun dispatchStartTemporaryDetach()

dispatchSystemUiVisibilityChanged

open override fun ~~dispatchSystemUiVisibilityChanged~~(p0: Int)

dispatchTouchEvent

open override fun dispatchTouchEvent(p0: MotionEvent): Boolean

dispatchTrackballEvent

open override fun dispatchTrackballEvent(p0: MotionEvent): Boolean

dispatchUnhandledMove

open override fun dispatchUnhandledMove(p0: View, p1: Int): Boolean

dispatchWindowFocusChanged

open override fun dispatchWindowFocusChanged(p0: Boolean)

dispatchWindowInsetsAnimationEnd

open override fun dispatchWindowInsetsAnimationEnd(p0: WindowInsetsAnimation)

dispatchWindowInsetsAnimationPrepare

open override fun dispatchWindowInsetsAnimationPrepare(p0: WindowInsetsAnimation)

dispatchWindowInsetsAnimationProgress

open override fun dispatchWindowInsetsAnimationProgress(p0: WindowInsets, p1: MutableList<WindowInsetsAnimation>): WindowInsets

dispatchWindowInsetsAnimationStart

open override fun dispatchWindowInsetsAnimationStart(p0: WindowInsetsAnimation, p1: WindowInsetsAnimation.Bounds): WindowInsetsAnimation.Bounds

dispatchWindowSystemUiVisiblityChanged

open override fun ~~dispatchWindowSystemUiVisiblityChanged~~(p0: Int)

dispatchWindowVisibilityChanged

open override fun dispatchWindowVisibilityChanged(p0: Int)

draw

open fun draw(p0: Canvas)

drawableHotspotChanged

open fun drawableHotspotChanged(p0: Float, p1: Float)

endViewTransition

open fun endViewTransition(p0: View)

findFocus

open override fun findFocus(): View

findOnBackInvokedDispatcher

fun findOnBackInvokedDispatcher(): OnBackInvokedDispatcher?

findOnBackInvokedDispatcherForChild

open override fun findOnBackInvokedDispatcherForChild(p0: View, p1: View): OnBackInvokedDispatcher?

findViewById

fun <T : View> findViewById(p0: Int): T

findViewsWithText

open override fun findViewsWithText(p0: ArrayList<View>, p1: CharSequence, p2: Int)

findViewWithTag

fun <T : View> findViewWithTag(p0: Any): T

focusableViewAvailable

open override fun focusableViewAvailable(p0: View)

focusSearch

open fun focusSearch(p0: Int): View

open override fun focusSearch(p0: View, p1: Int): View

forceHasOverlappingRendering

open fun forceHasOverlappingRendering(p0: Boolean)

forceLayout

open fun forceLayout()

gatherTransparentRegion

open override fun gatherTransparentRegion(p0: Region?): Boolean

generateDisplayHash

open fun generateDisplayHash(p0: String, p1: Rect?, p2: Executor, p3: DisplayHashResultCallback)

generateLayoutParams

open override fun generateLayoutParams(p0: AttributeSet): LinearLayout.LayoutParams

getAccessibilityClassName

open override fun getAccessibilityClassName(): CharSequence

getAccessibilityDelegate

open fun getAccessibilityDelegate(): View.AccessibilityDelegate

getAccessibilityLiveRegion

open fun getAccessibilityLiveRegion(): Int

getAccessibilityNodeProvider

open fun getAccessibilityNodeProvider(): AccessibilityNodeProvider

getAccessibilityPaneTitle

open fun getAccessibilityPaneTitle(): CharSequence?

getAccessibilityTraversalAfter

open fun getAccessibilityTraversalAfter(): Int

getAccessibilityTraversalBefore

open fun getAccessibilityTraversalBefore(): Int

getAllowedHandwritingDelegatePackageName

open fun getAllowedHandwritingDelegatePackageName(): String?

getAllowedHandwritingDelegatorPackageName

open fun getAllowedHandwritingDelegatorPackageName(): String?

getAlpha

open fun getAlpha(): Float

getAnimation

open fun getAnimation(): Animation

getAnimationMatrix

open fun getAnimationMatrix(): Matrix?

getApplicationWindowToken

open fun getApplicationWindowToken(): IBinder

getAttributeResolutionStack

open fun getAttributeResolutionStack(p0: Int): IntArray

getAttributeSourceResourceMap

open fun getAttributeSourceResourceMap(): MutableMap<Int, Int>

getAutofillHints

open fun getAutofillHints(): Array<String>?

getAutofillId

fun getAutofillId(): AutofillId

getAutofillType

open fun getAutofillType(): Int

getAutofillValue

open fun getAutofillValue(): AutofillValue?

getBackground

open fun getBackground(): Drawable

getBackgroundTintBlendMode

open fun getBackgroundTintBlendMode(): BlendMode?

getBackgroundTintList

open fun getBackgroundTintList(): ColorStateList?

getBackgroundTintMode

open fun getBackgroundTintMode(): PorterDuff.Mode?

getBaseline

open override fun getBaseline(): Int

getBaselineAlignedChildIndex

open fun getBaselineAlignedChildIndex(): Int

getBottom

fun getBottom(): Int

getCameraDistance

open fun getCameraDistance(): Float

getChildAt

open fun getChildAt(p0: Int): View

getChildCount

open fun getChildCount(): Int

getChildDrawingOrder

fun getChildDrawingOrder(p0: Int): Int

getChildVisibleRect

open override fun getChildVisibleRect(p0: View, p1: Rect, p2: Point): Boolean

getClipBounds

open fun getClipBounds(): Rect

open fun getClipBounds(p0: Rect): Boolean

getClipChildren

open fun getClipChildren(): Boolean

getClipToOutline

fun getClipToOutline(): Boolean

getClipToPadding

open fun getClipToPadding(): Boolean

getContentCaptureSession

fun getContentCaptureSession(): ContentCaptureSession?

getContentDescription

open fun getContentDescription(): CharSequence

getContentSensitivity

fun getContentSensitivity(): Int

getContext

fun getContext(): Context

getDefaultFocusHighlightEnabled

fun getDefaultFocusHighlightEnabled(): Boolean

getDescendantFocusability

open fun getDescendantFocusability(): Int

getDisplay

open fun getDisplay(): Display

getDividerDrawable

open fun getDividerDrawable(): Drawable

getDividerPadding

open fun getDividerPadding(): Int

getDrawableState

fun getDrawableState(): IntArray

getDrawingCache

open fun ~~getDrawingCache~~(): Bitmap

open fun ~~getDrawingCache~~(p0: Boolean): Bitmap

getDrawingCacheBackgroundColor

open fun ~~getDrawingCacheBackgroundColor~~(): Int

getDrawingCacheQuality

open fun ~~getDrawingCacheQuality~~(): Int

getDrawingRect

open fun getDrawingRect(p0: Rect)

getDrawingTime

open fun getDrawingTime(): Long

getElevation

open fun getElevation(): Float

getExplicitStyle

open fun getExplicitStyle(): Int

getFilterTouchesWhenObscured

open fun getFilterTouchesWhenObscured(): Boolean

getFitsSystemWindows

open fun getFitsSystemWindows(): Boolean

getFocusable

open fun getFocusable(): Int

getFocusables

open fun getFocusables(p0: Int): ArrayList<View>

getFocusedChild

open fun getFocusedChild(): View

getFocusedRect

open fun getFocusedRect(p0: Rect)

getForeground

open fun getForeground(): Drawable

getForegroundGravity

open fun getForegroundGravity(): Int

getForegroundTintBlendMode

open fun getForegroundTintBlendMode(): BlendMode?

getForegroundTintList

open fun getForegroundTintList(): ColorStateList?

getForegroundTintMode

open fun getForegroundTintMode(): PorterDuff.Mode?

getFrameContentVelocity

open fun getFrameContentVelocity(): Float

getGlobalVisibleRect

fun getGlobalVisibleRect(p0: Rect): Boolean

open fun getGlobalVisibleRect(p0: Rect, p1: Point): Boolean

getGravity

open fun getGravity(): Int

getHandler

open fun getHandler(): Handler

getHandwritingBoundsOffsetBottom

open fun getHandwritingBoundsOffsetBottom(): Float

getHandwritingBoundsOffsetLeft

open fun getHandwritingBoundsOffsetLeft(): Float

getHandwritingBoundsOffsetRight

open fun getHandwritingBoundsOffsetRight(): Float

getHandwritingBoundsOffsetTop

open fun getHandwritingBoundsOffsetTop(): Float

getHandwritingDelegateFlags

open fun getHandwritingDelegateFlags(): Int

getHandwritingDelegatorCallback

open fun getHandwritingDelegatorCallback(): Runnable?

getHasOverlappingRendering

fun getHasOverlappingRendering(): Boolean

getHeight

fun getHeight(): Int

getHitRect

open fun getHitRect(p0: Rect)

getHorizontalFadingEdgeLength

open fun getHorizontalFadingEdgeLength(): Int

getHorizontalScrollbarThumbDrawable

open fun getHorizontalScrollbarThumbDrawable(): Drawable?

getHorizontalScrollbarTrackDrawable

open fun getHorizontalScrollbarTrackDrawable(): Drawable?

getId

open fun getId(): Int

getImportantForAccessibility

open fun getImportantForAccessibility(): Int

getImportantForAutofill

open fun getImportantForAutofill(): Int

getImportantForContentCapture

open fun getImportantForContentCapture(): Int

getKeepScreenOn

open fun getKeepScreenOn(): Boolean

getKeyDispatcherState

open fun getKeyDispatcherState(): KeyEvent.DispatcherState

getLabelFor

open fun getLabelFor(): Int

getLayerType

open fun getLayerType(): Int

getLayoutAnimation

open fun getLayoutAnimation(): LayoutAnimationController

getLayoutAnimationListener

open fun getLayoutAnimationListener(): Animation.AnimationListener

getLayoutDirection

open fun getLayoutDirection(): Int

getLayoutMode

open fun getLayoutMode(): Int

getLayoutParams

open fun getLayoutParams(): ViewGroup.LayoutParams

getLayoutTransition

open fun getLayoutTransition(): LayoutTransition

getLeft

fun getLeft(): Int

getLocalVisibleRect

fun getLocalVisibleRect(p0: Rect): Boolean

getLocationInSurface

open fun getLocationInSurface(p0: IntArray)

getLocationInWindow

open fun getLocationInWindow(p0: IntArray)

getLocationOnScreen

open fun getLocationOnScreen(p0: IntArray)

getMatrix

open fun getMatrix(): Matrix

getMeasuredHeight

fun getMeasuredHeight(): Int

getMeasuredHeightAndState

fun getMeasuredHeightAndState(): Int

getMeasuredState

fun getMeasuredState(): Int

getMeasuredWidth

fun getMeasuredWidth(): Int

getMeasuredWidthAndState

fun getMeasuredWidthAndState(): Int

getMinimumHeight

open fun getMinimumHeight(): Int

getMinimumWidth

open fun getMinimumWidth(): Int

getNestedScrollAxes

open fun getNestedScrollAxes(): Int

getNextClusterForwardId

open fun getNextClusterForwardId(): Int

getNextFocusDownId

open fun getNextFocusDownId(): Int

getNextFocusForwardId

open fun getNextFocusForwardId(): Int

getNextFocusLeftId

open fun getNextFocusLeftId(): Int

getNextFocusRightId

open fun getNextFocusRightId(): Int

getNextFocusUpId

open fun getNextFocusUpId(): Int

getOnFocusChangeListener

open fun getOnFocusChangeListener(): View.OnFocusChangeListener

getOrientation

open fun getOrientation(): Int

getOutlineAmbientShadowColor

open fun getOutlineAmbientShadowColor(): Int

getOutlineProvider

open fun getOutlineProvider(): ViewOutlineProvider

getOutlineSpotShadowColor

open fun getOutlineSpotShadowColor(): Int

getOverlay

open override fun getOverlay(): ViewGroupOverlay

getOverScrollMode

open fun getOverScrollMode(): Int

getPaddingBottom

open fun getPaddingBottom(): Int

getPaddingEnd

open fun getPaddingEnd(): Int

getPaddingLeft

open fun getPaddingLeft(): Int

getPaddingRight

open fun getPaddingRight(): Int

getPaddingStart

open fun getPaddingStart(): Int

getPaddingTop

open fun getPaddingTop(): Int

getParent

fun getParent(): ViewParent

getParentForAccessibility

open fun getParentForAccessibility(): ViewParent

getPendingCredentialCallback

fun getPendingCredentialCallback(): OutcomeReceiver<GetCredentialResponse, GetCredentialException>?

getPendingCredentialRequest

fun getPendingCredentialRequest(): GetCredentialRequest?

getPersistentDrawingCache

open fun ~~getPersistentDrawingCache~~(): Int

getPivotX

open fun getPivotX(): Float

getPivotY

open fun getPivotY(): Float

getPointerIcon

open fun getPointerIcon(): PointerIcon

getPreferKeepClearRects

fun getPreferKeepClearRects(): MutableList<Rect>

getReceiveContentMimeTypes

open fun getReceiveContentMimeTypes(): Array<String>?

getRequestedFrameRate

open fun getRequestedFrameRate(): Float

getResources

open fun getResources(): Resources

getRevealOnFocusHint

fun getRevealOnFocusHint(): Boolean

getRight

fun getRight(): Int

getRootSurfaceControl

open fun getRootSurfaceControl(): AttachedSurfaceControl?

getRootView

open fun getRootView(): View

getRootWindowInsets

open fun getRootWindowInsets(): WindowInsets

getRotation

open fun getRotation(): Float

getRotationX

open fun getRotationX(): Float

getRotationY

open fun getRotationY(): Float

getScaleX

open fun getScaleX(): Float

getScaleY

open fun getScaleY(): Float

getScrollBarDefaultDelayBeforeFade

open fun getScrollBarDefaultDelayBeforeFade(): Int

getScrollBarFadeDuration

open fun getScrollBarFadeDuration(): Int

getScrollBarSize

open fun getScrollBarSize(): Int

getScrollBarStyle

open fun getScrollBarStyle(): Int

getScrollCaptureHint

open fun getScrollCaptureHint(): Int

getScrollIndicators

open fun getScrollIndicators(): Int

getScrollX

fun getScrollX(): Int

getScrollY

fun getScrollY(): Int

getShowDividers

open fun getShowDividers(): Int

getSolidColor

open fun getSolidColor(): Int

getSourceLayoutResId

open fun getSourceLayoutResId(): Int

getStateDescription

fun getStateDescription(): CharSequence?

getStateListAnimator

open fun getStateListAnimator(): StateListAnimator

getSystemGestureExclusionRects

open fun getSystemGestureExclusionRects(): MutableList<Rect>

getSystemUiVisibility

open fun ~~getSystemUiVisibility~~(): Int

getTag

open fun getTag(): Any

open fun getTag(p0: Int): Any

getTextAlignment

open fun getTextAlignment(): Int

getTextDirection

open fun getTextDirection(): Int

getTooltipText

open fun getTooltipText(): CharSequence?

getTop

fun getTop(): Int

getTouchables

open fun getTouchables(): ArrayList<View>

getTouchDelegate

open fun getTouchDelegate(): TouchDelegate

getTouchscreenBlocksFocus

open fun getTouchscreenBlocksFocus(): Boolean

getTransitionAlpha

open fun getTransitionAlpha(): Float

getTransitionName

open fun getTransitionName(): String

getTranslationX

open fun getTranslationX(): Float

getTranslationY

open fun getTranslationY(): Float

getTranslationZ

open fun getTranslationZ(): Float

getUniqueDrawingId

open fun getUniqueDrawingId(): Long

getVerticalFadingEdgeLength

open fun getVerticalFadingEdgeLength(): Int

getVerticalScrollbarPosition

open fun getVerticalScrollbarPosition(): Int

getVerticalScrollbarThumbDrawable

open fun getVerticalScrollbarThumbDrawable(): Drawable?

getVerticalScrollbarTrackDrawable

open fun getVerticalScrollbarTrackDrawable(): Drawable?

getVerticalScrollbarWidth

open fun getVerticalScrollbarWidth(): Int

getViewTranslationResponse

open fun getViewTranslationResponse(): ViewTranslationResponse?

getViewTreeObserver

open fun getViewTreeObserver(): ViewTreeObserver

getVisibility

open fun getVisibility(): Int

getWeightSum

open fun getWeightSum(): Float

getWidth

fun getWidth(): Int

getWindowId

open fun getWindowId(): WindowId

getWindowInsetsController

open fun getWindowInsetsController(): WindowInsetsController?

getWindowSystemUiVisibility

open fun ~~getWindowSystemUiVisibility~~(): Int

getWindowToken

open fun getWindowToken(): IBinder

getWindowVisibility

open fun getWindowVisibility(): Int

getWindowVisibleDisplayFrame

open fun getWindowVisibleDisplayFrame(p0: Rect)

getX

open fun getX(): Float

getY

open fun getY(): Float

getZ

open fun getZ(): Float

hasExplicitFocusable

open fun hasExplicitFocusable(): Boolean

hasFocus

open override fun hasFocus(): Boolean

hasFocusable

open fun hasFocusable(): Boolean

hasNestedScrollingParent

open fun hasNestedScrollingParent(): Boolean

hasOnClickListeners

open fun hasOnClickListeners(): Boolean

hasOnLongClickListeners

open fun hasOnLongClickListeners(): Boolean

hasOverlappingRendering

open fun hasOverlappingRendering(): Boolean

hasPointerCapture

open fun hasPointerCapture(): Boolean

hasTransientState

open override fun hasTransientState(): Boolean

hasWindowFocus

open fun hasWindowFocus(): Boolean

hideKeyboard

@RestrictTo(value = [RestrictTo.Scope.LIBRARY_GROUP])

fun View.hideKeyboard()

highlightValidationErrors

fun highlightValidationErrors()

Highlight and focus on the current validation errors for the user to take action. If the component doesn't need validation or if everything is already valid, nothing will happen.

indexOfChild