# HelperReference

Artifact: [androidx.constraintlayout:constraintlayout-core](https://developer.android.com/jetpack/androidx/releases/constraintlayout) [View Source](https://cs.android.com/search?q=file:androidx/constraintlayout/core/state/HelperReference.java+class:androidx.constraintlayout.core.state.HelperReference) Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

*** ** * ** ***


```
class HelperReference : ConstraintReference, Facade
```

<br />

|---|---|---|
| [kotlin.Any](https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html) |||
| ↳ | [androidx.constraintlayout.core.state.ConstraintReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference) ||
|   | ↳ | [androidx.constraintlayout.core.state.HelperReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference) |

Known direct subclasses [AlignHorizontallyReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/AlignHorizontallyReference), [AlignVerticallyReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/AlignVerticallyReference), [BarrierReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/BarrierReference), [ChainReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/ChainReference), [FlowReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/FlowReference), [GridReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/GridReference)

|---|---|
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/AlignHorizontallyReference` |   |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/AlignVerticallyReference` |   |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/BarrierReference` |   |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/ChainReference` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference` for Chains. |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/FlowReference` | The FlowReference class can be used to store the relevant properties of a Flow Helper when parsing the Flow Helper information in a JSON representation. |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/GridReference` | A HelperReference of a Grid Helper that helps enable Grid in Compose |

Known indirect subclasses [HorizontalChainReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/HorizontalChainReference), [VerticalChainReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/VerticalChainReference)

|---|---|
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/HorizontalChainReference` |   |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/VerticalChainReference` |   |

*** ** * ** ***

## Summary

| ### Public constructors |
|---|
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#HelperReference(androidx.constraintlayout.core.state.State,androidx.constraintlayout.core.state.State.Helper)(state: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/State!, type: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/State.Helper!)` |

| ### Public functions |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#add(java.lang.Object...)(objects: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-array/index.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!>!)` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#apply()()` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#applyBase()()` Allows the derived classes to invoke the apply method in the ConstraintReference |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/widgets/ConstraintWidget!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#getConstraintWidget()()` |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/widgets/HelperWidget!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#getHelperWidget()()` |
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/State.Helper!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#getType()()` |
| `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#setHelperWidget(androidx.constraintlayout.core.widgets.HelperWidget)(helperWidget: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/widgets/HelperWidget!)` |

| ### Protected properties |
|---|---|
| `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/State!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#mHelperState()` |
| `https://developer.android.com/reference/java/util/ArrayList.html<https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!>!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/HelperReference#mReferences()` |

| ### Inherited functions |
|---|
| From [androidx.constraintlayout.core.state.ConstraintReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference) |---|---| | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#addCustomColor(java.lang.String,int)(name: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!, color: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#addCustomFloat(java.lang.String,float)(name: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!, value: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#alpha(float)(alpha: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#applyWidgetConstraints()()` apply all the constraints attributes of the mConstraintWidget | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#baseline()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#baselineToBaseline(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#baselineToBottom(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#baselineToTop(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#bias(float)(value: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#bottom()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#bottomToBottom(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#bottomToTop(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#centerHorizontally(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#centerVertically(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#circularConstraint(java.lang.Object,float,float)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!, angle: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html, distance: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#clear()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#clearAll()()` Clears all constraints. | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#clearHorizontal()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#clearVertical()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/widgets/ConstraintWidget!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#createConstraintWidget()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#end()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#endToEnd(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#endToStart(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getAlpha()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/Facade!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getFacade()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/Dimension!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getHeight()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getHorizontalChainStyle()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getHorizontalChainWeight()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getKey()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getPivotX()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getPivotY()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getRotationX()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getRotationY()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getRotationZ()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getScaleX()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getScaleY()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getTag()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getTranslationX()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getTranslationY()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getTranslationZ()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getVerticalChainStyle(int)(chainStyle: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getVerticalChainWeight()()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getView()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/Dimension!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#getWidth()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#height(androidx.constraintlayout.core.state.Dimension)(dimension: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/Dimension!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#horizontalBias(float)(value: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#left()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#leftToLeft(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#leftToRight(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#margin(java.lang.Object)(marginValue: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#margin(int)(value: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#marginGone(java.lang.Object)(marginGoneValue: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#marginGone(int)(value: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#pivotX(float)(x: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#pivotY(float)(y: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#right()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#rightToLeft(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#rightToRight(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#rotationX(float)(x: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#rotationY(float)(y: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#rotationZ(float)(z: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#scaleX(float)(x: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#scaleY(float)(y: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setConstraintWidget(androidx.constraintlayout.core.widgets.ConstraintWidget)(widget: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/widgets/ConstraintWidget!)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setFacade(androidx.constraintlayout.core.state.helpers.Facade)(facade: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/helpers/Facade!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setHeight(androidx.constraintlayout.core.state.Dimension)(dimension: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/Dimension!)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setHorizontalChainStyle(int)(chainStyle: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setHorizontalChainWeight(float)(weight: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setKey(java.lang.Object)(key: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setTag(java.lang.String)(tag: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-string/index.html!)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setVerticalChainStyle(int)(chainStyle: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setVerticalChainWeight(float)(weight: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setView(java.lang.Object)(view: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#setWidth(androidx.constraintlayout.core.state.Dimension)(dimension: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/Dimension!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#start()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#startToEnd(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#startToStart(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#top()()` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#topToBottom(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#topToTop(java.lang.Object)(reference: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#translationX(float)(x: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#translationY(float)(y: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#translationZ(float)(z: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-unit/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#validate()()` Validate the constraints | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#verticalBias(float)(value: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#visibility(int)(visibility: https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html)` | | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#width(androidx.constraintlayout.core.state.Dimension)(dimension: https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/Dimension!)` | |

| ### Inherited properties |
|---|
| From [androidx.constraintlayout.core.state.ConstraintReference](https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference) |---|---| | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mBottomToBottom()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mBottomToTop()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mEndToEnd()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mEndToStart()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mHorizontalBias()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mLeftToLeft()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mLeftToRight()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginBottom()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginBottomGone()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginEnd()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginEndGone()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginLeft()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginLeftGone()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginRight()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginRightGone()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginStart()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginStartGone()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginTop()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-int/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mMarginTopGone()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mRightToLeft()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mRightToRight()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mStartToEnd()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mStartToStart()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mTopToBottom()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-any/index.html!` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mTopToTop()` | | `https://kotlinlang.org/api/core/kotlin-stdlib/kotlin/-float/index.html` | `https://developer.android.com/reference/kotlin/androidx/constraintlayout/core/state/ConstraintReference#mVerticalBias()` | |

## Public constructors

### HelperReference

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
HelperReference(state: State!, type: State.Helper!)
```

## Public functions

### add

```
fun add(objects: Array<Any!>!): HelperReference!
```

### apply

```
fun apply(): Unit
```

### applyBase

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
fun applyBase(): Unit
```

Allows the derived classes to invoke the apply method in the ConstraintReference

### getConstraintWidget

```
fun getConstraintWidget(): ConstraintWidget!
```

### getHelperWidget

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
fun getHelperWidget(): HelperWidget!
```

### getType

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
fun getType(): State.Helper!
```

### setHelperWidget

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
fun setHelperWidget(helperWidget: HelperWidget!): Unit
```

## Protected properties

### mHelperState

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
protected val mHelperState: State!
```

### mReferences

Added in [1.1.2](https://developer.android.com/jetpack/androidx/releases/constraintlayout#1.1.2)

```
protected val mReferences: ArrayList<Any!>!
```