ChainHead

Artifact: androidx.constraintlayout:constraintlayout-core

View Source

Added in 1.1.2

---

Kotlin |Java

class ChainHead

---

Class to represent a chain by its main elements.

Summary

Public constructors
ChainHead(first: ConstraintWidget!, orientation: Int, isRtl: Boolean) Initialize variables, then determine visible widgets, the head of chain and matched constraint widgets.

Public functions
Unit	define()
ConstraintWidget!	getFirst()
ConstraintWidget!	getFirstMatchConstraintWidget()
ConstraintWidget!	getFirstVisibleWidget()
ConstraintWidget!	getHead()
ConstraintWidget!	getLast()
ConstraintWidget!	getLastMatchConstraintWidget()
ConstraintWidget!	getLastVisibleWidget()
Float	getTotalWeight()

Protected properties
ConstraintWidget!	mFirst
ConstraintWidget!	mFirstMatchConstraintWidget
ConstraintWidget!	mFirstVisibleWidget
Boolean	mHasComplexMatchWeights
Boolean	mHasDefinedWeights
Boolean	mHasRatio
Boolean	mHasUndefinedWeights
ConstraintWidget!	mHead
ConstraintWidget!	mLast
ConstraintWidget!	mLastMatchConstraintWidget
ConstraintWidget!	mLastVisibleWidget
Float	mTotalWeight
ArrayList<ConstraintWidget!>!	mWeightedMatchConstraintsWidgets
Int	mWidgetsCount
Int	mWidgetsMatchCount

Public constructors

ChainHead

Added in 1.1.2

ChainHead(first: ConstraintWidget!, orientation: Int, isRtl: Boolean)

Initialize variables, then determine visible widgets, the head of chain and matched constraint widgets.

Parameters
first: ConstraintWidget!	first widget in a chain
orientation: Int	orientation of the chain (either Horizontal or Vertical)
isRtl: Boolean	Right-to-left layout flag to determine the actual head of the chain

Public functions

define

Added in 1.1.2

fun define(): Unit

getFirst

Added in 1.1.2

fun getFirst(): ConstraintWidget!

getFirstMatchConstraintWidget

Added in 1.1.2

fun getFirstMatchConstraintWidget(): ConstraintWidget!

getFirstVisibleWidget

Added in 1.1.2

fun getFirstVisibleWidget(): ConstraintWidget!

getHead

Added in 1.1.2

fun getHead(): ConstraintWidget!

getLast

Added in 1.1.2

fun getLast(): ConstraintWidget!

getLastMatchConstraintWidget

Added in 1.1.2

fun getLastMatchConstraintWidget(): ConstraintWidget!

getLastVisibleWidget

Added in 1.1.2

fun getLastVisibleWidget(): ConstraintWidget!

getTotalWeight

Added in 1.1.2

fun getTotalWeight(): Float

Protected properties

mFirst

Added in 1.1.2

protected val mFirst: ConstraintWidget!

mFirstMatchConstraintWidget

Added in 1.1.2

protected val mFirstMatchConstraintWidget: ConstraintWidget!

mFirstVisibleWidget

Added in 1.1.2

protected val mFirstVisibleWidget: ConstraintWidget!

mHasComplexMatchWeights

Added in 1.1.2

protected val mHasComplexMatchWeights: Boolean

mHasDefinedWeights

Added in 1.1.2

protected val mHasDefinedWeights: Boolean

mHasRatio

Added in 1.1.2

protected val mHasRatio: Boolean

mHasUndefinedWeights

Added in 1.1.2

protected val mHasUndefinedWeights: Boolean

mHead

Added in 1.1.2

protected val mHead: ConstraintWidget!

mLast

Added in 1.1.2

protected val mLast: ConstraintWidget!

mLastMatchConstraintWidget

Added in 1.1.2

protected val mLastMatchConstraintWidget: ConstraintWidget!

mLastVisibleWidget

Added in 1.1.2

protected val mLastVisibleWidget: ConstraintWidget!

mTotalWeight

Added in 1.1.2

protected val mTotalWeight: Float

mWeightedMatchConstraintsWidgets

Added in 1.1.2

protected val mWeightedMatchConstraintsWidgets: ArrayList<ConstraintWidget!>!

mWidgetsCount

Added in 1.1.2

protected val mWidgetsCount: Int

mWidgetsMatchCount

Added in 1.1.2

protected val mWidgetsMatchCount: Int