Package androidx.constraintlayout.core.widgets

Class ChainHead

java.lang.Object

androidx.constraintlayout.core.widgets.ChainHead

public class ChainHead
extends java.lang.Object

Class to represent a chain by its main elements.

Field Summary

Fields

Modifier and Type	Field	Description
protected ConstraintWidget	mFirst
protected ConstraintWidget	mFirstMatchConstraintWidget
protected ConstraintWidget	mFirstVisibleWidget
protected boolean	mHasComplexMatchWeights
protected boolean	mHasDefinedWeights
protected boolean	mHasRatio
protected boolean	mHasUndefinedWeights
protected ConstraintWidget	mHead
protected ConstraintWidget	mLast
protected ConstraintWidget	mLastMatchConstraintWidget
protected ConstraintWidget	mLastVisibleWidget
protected float	mTotalWeight
protected java.util.ArrayList<ConstraintWidget>	mWeightedMatchConstraintsWidgets
protected int	mWidgetsCount
protected int	mWidgetsMatchCount

Constructor Summary

Constructors

Constructor	Description
ChainHead(ConstraintWidget first, int orientation, boolean isRtl)	Initialize variables, then determine visible widgets, the head of chain and matched constraint widgets.

Method Summary

Modifier and Type	Method	Description
void	define()
ConstraintWidget	getFirst()
ConstraintWidget	getFirstMatchConstraintWidget()
ConstraintWidget	getFirstVisibleWidget()
ConstraintWidget	getHead()
ConstraintWidget	getLast()
ConstraintWidget	getLastMatchConstraintWidget()
ConstraintWidget	getLastVisibleWidget()
float	getTotalWeight()

Methods inherited from class java.lang.Object

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

Field Detail

mFirst

protected ConstraintWidget mFirst

mFirstVisibleWidget

protected ConstraintWidget mFirstVisibleWidget

mLast

protected ConstraintWidget mLast

mLastVisibleWidget

protected ConstraintWidget mLastVisibleWidget

mHead

protected ConstraintWidget mHead

mFirstMatchConstraintWidget

protected ConstraintWidget mFirstMatchConstraintWidget

mLastMatchConstraintWidget

protected ConstraintWidget mLastMatchConstraintWidget

mWeightedMatchConstraintsWidgets

protected java.util.ArrayList<ConstraintWidget> mWeightedMatchConstraintsWidgets

mWidgetsCount

protected int mWidgetsCount

mWidgetsMatchCount

protected int mWidgetsMatchCount

mTotalWeight

protected float mTotalWeight

mHasUndefinedWeights

protected boolean mHasUndefinedWeights

mHasDefinedWeights

protected boolean mHasDefinedWeights

mHasComplexMatchWeights

protected boolean mHasComplexMatchWeights

mHasRatio

protected boolean mHasRatio

Constructor Detail

ChainHead

public ChainHead(ConstraintWidget first,
                 int orientation,
                 boolean isRtl)

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

Parameters:

first - first widget in a chain

orientation - orientation of the chain (either Horizontal or Vertical)

isRtl - Right-to-left layout flag to determine the actual head of the chain

Method Detail

getFirst

public ConstraintWidget getFirst()

getFirstVisibleWidget

public ConstraintWidget getFirstVisibleWidget()

getLast

public ConstraintWidget getLast()

getLastVisibleWidget

public ConstraintWidget getLastVisibleWidget()

getHead

public ConstraintWidget getHead()

getFirstMatchConstraintWidget

public ConstraintWidget getFirstMatchConstraintWidget()

getLastMatchConstraintWidget

public ConstraintWidget getLastMatchConstraintWidget()

getTotalWeight

public float getTotalWeight()

define

public void define()