Package androidx.constraintlayout.core.widgets

Class ConstraintWidgetContainer

java.lang.Object

androidx.constraintlayout.core.widgets.ConstraintWidget

androidx.constraintlayout.core.widgets.WidgetContainer

androidx.constraintlayout.core.widgets.ConstraintWidgetContainer

public class ConstraintWidgetContainer
extends WidgetContainer

A container of ConstraintWidget that can layout its children

Nested Class Summary

Nested classes/interfaces inherited from class androidx.constraintlayout.core.widgets.ConstraintWidget

ConstraintWidget.DimensionBehaviour

Field Summary

Fields

Modifier and Type	Field	Description
DependencyGraph	mDependencyGraph
boolean	mGroupsWrapOptimized
int	mHorizontalChainsSize
boolean	mHorizontalWrapOptimized
BasicMeasure.Measure	mMeasure
protected BasicMeasure.Measurer	mMeasurer
Metrics	mMetrics
boolean	mSkipSolver
protected LinearSystem	mSystem
int	mVerticalChainsSize
boolean	mVerticalWrapOptimized
int	mWrapFixedHeight
int	mWrapFixedWidth

Fields inherited from class androidx.constraintlayout.core.widgets.WidgetContainer

mChildren

Fields inherited from class androidx.constraintlayout.core.widgets.ConstraintWidget

ANCHOR_BASELINE, ANCHOR_BOTTOM, ANCHOR_LEFT, ANCHOR_RIGHT, ANCHOR_TOP, BOTH, CHAIN_PACKED, CHAIN_SPREAD, CHAIN_SPREAD_INSIDE, DEFAULT_BIAS, DIRECT, frame, GONE, HORIZONTAL, horizontalChainRun, horizontalGroup, INVISIBLE, isTerminalWidget, mAnchors, MATCH_CONSTRAINT_PERCENT, MATCH_CONSTRAINT_RATIO, MATCH_CONSTRAINT_RATIO_RESOLVED, MATCH_CONSTRAINT_SPREAD, MATCH_CONSTRAINT_WRAP, mBaseline, mBottom, mCenter, mDimensionRatio, mDimensionRatioSide, measured, mHorizontalResolution, mHorizontalRun, mIsHeightWrapContent, mIsWidthWrapContent, mLeft, mListAnchors, mListDimensionBehaviors, mListNextMatchConstraintsWidget, mMatchConstraintDefaultHeight, mMatchConstraintDefaultWidth, mMatchConstraintMaxHeight, mMatchConstraintMaxWidth, mMatchConstraintMinHeight, mMatchConstraintMinWidth, mMatchConstraintPercentHeight, mMatchConstraintPercentWidth, mMinHeight, mMinWidth, mNextChainWidget, mOffsetX, mOffsetY, mParent, mResolvedMatchConstraintDefault, mRight, mTop, mVerticalResolution, mVerticalRun, mWeight, mX, mY, run, SOLVER, stringId, UNKNOWN, VERTICAL, verticalChainRun, verticalGroup, VISIBLE, WRAP_BEHAVIOR_HORIZONTAL_ONLY, WRAP_BEHAVIOR_INCLUDED, WRAP_BEHAVIOR_SKIPPED, WRAP_BEHAVIOR_VERTICAL_ONLY

Constructor Summary

Constructors

Constructor	Description
ConstraintWidgetContainer()	Default constructor
ConstraintWidgetContainer(int width, int height)	Constructor
ConstraintWidgetContainer(int x, int y, int width, int height)	Constructor
ConstraintWidgetContainer(java.lang.String debugName, int width, int height)

Method Summary

Modifier and Type	Method	Description
boolean	addChildrenToSolver(LinearSystem system)	Add this widget to the solver
void	addHorizontalWrapMaxVariable(ConstraintAnchor right)
void	addHorizontalWrapMinVariable(ConstraintAnchor left)
void	defineTerminalWidgets()
boolean	directMeasure(boolean optimizeWrap)
boolean	directMeasureSetup(boolean optimizeWrap)
boolean	directMeasureWithOrientation(boolean optimizeWrap, int orientation)
void	fillMetrics(Metrics metrics)
java.util.ArrayList<Guideline>	getHorizontalGuidelines()	Accessor to the horizontal guidelines contained in the table.
BasicMeasure.Measurer	getMeasurer()
int	getOptimizationLevel()	Returns the current optimization level
void	getSceneString(java.lang.StringBuilder ret)
LinearSystem	getSystem()
java.lang.String	getType()	Specify the xml type for the container
java.util.ArrayList<Guideline>	getVerticalGuidelines()	Accessor to the vertical guidelines contained in the table.
boolean	handlesInternalConstraints()	Indicates if the container knows how to layout its content on its own
void	invalidateGraph()	Invalidate the graph of constraints
void	invalidateMeasures()	Invalidate the widgets measures
boolean	isHeightMeasuredTooSmall()	Return true if the height given is too small for the content laid out
boolean	isRtl()	Returns the rtl status.
boolean	isWidthMeasuredTooSmall()	Return true if the width given is too small for the content laid out
void	layout()	Layout the tree of widgets
long	measure(int optimizationLevel, int widthMode, int widthSize, int heightMode, int heightSize, int lastMeasureWidth, int lastMeasureHeight, int paddingX, int paddingY)	Measure the layout
static boolean	measure(int level, ConstraintWidget widget, BasicMeasure.Measurer measurer, BasicMeasure.Measure measure, int measureStrategy)
boolean	optimizeFor(int feature)	Returns true if the given feature should be optimized
void	reset()
void	setMeasurer(BasicMeasure.Measurer measurer)
void	setOptimizationLevel(int value)	Resolves the system directly when possible
void	setPadding(int left, int top, int right, int bottom)	Set the padding on this container.
void	setPass(int pass)	Keep track of the # of passes
void	setRtl(boolean isRtl)	Set the rtl status.
boolean	updateChildrenFromSolver(LinearSystem system, boolean[] flags)	Update the frame of the layout and its children from the solver
void	updateFromRuns(boolean updateHorizontal, boolean updateVertical)
void	updateHierarchy()

Methods inherited from class androidx.constraintlayout.core.widgets.WidgetContainer

add, add, getChildren, getRootConstraintContainer, remove, removeAllChildren, resetSolverVariables, setOffset

Methods inherited from class androidx.constraintlayout.core.widgets.ConstraintWidget

addChildrenToSolverByDependency, addToSolver, allowedInBarrier, connect, connect, connect, connectCircularConstraint, copy, createObjectVariables, ensureMeasureRequested, ensureWidgetRuns, getAnchor, getAnchors, getBaselineDistance, getBiasPercent, getBottom, getCompanionWidget, getContainerItemSkip, getDebugName, getDimensionBehaviour, getDimensionRatio, getDimensionRatioSide, getHasBaseline, getHeight, getHorizontalBiasPercent, getHorizontalChainControlWidget, getHorizontalChainStyle, getHorizontalDimensionBehaviour, getHorizontalMargin, getLastHorizontalMeasureSpec, getLastVerticalMeasureSpec, getLeft, getLength, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getNextChainMember, getOptimizerWrapHeight, getOptimizerWrapWidth, getParent, getPreviousChainMember, getRight, getRootX, getRootY, getRun, getTop, getVerticalBiasPercent, getVerticalChainControlWidget, getVerticalChainStyle, getVerticalDimensionBehaviour, getVerticalMargin, getVisibility, getWidth, getWrapBehaviorInParent, getX, getY, hasBaseline, hasDanglingDimension, hasDependencies, hasDimensionOverride, hasResolvedTargets, immediateConnect, isAnimated, isHeightWrapContent, isHorizontalSolvingPassDone, isInBarrier, isInHorizontalChain, isInPlaceholder, isInVerticalChain, isInVirtualLayout, isMeasureRequested, isResolvedHorizontally, isResolvedVertically, isRoot, isSpreadHeight, isSpreadWidth, isVerticalSolvingPassDone, isWidthWrapContent, markHorizontalSolvingPassDone, markVerticalSolvingPassDone, oppositeDimensionDependsOn, oppositeDimensionsTied, resetAllConstraints, resetAnchor, resetAnchors, resetFinalResolution, resetSolvingPassFlag, serialize, setAnimated, setBaselineDistance, setCompanionWidget, setContainerItemSkip, setDebugName, setDebugSolverName, setDimension, setDimensionRatio, setDimensionRatio, setFinalBaseline, setFinalFrame, setFinalHorizontal, setFinalLeft, setFinalTop, setFinalVertical, setFrame, setFrame, setGoneMargin, setHasBaseline, setHeight, setHeightWrapContent, setHorizontalBiasPercent, setHorizontalChainStyle, setHorizontalDimension, setHorizontalDimensionBehaviour, setHorizontalMatchStyle, setHorizontalWeight, setInBarrier, setInPlaceholder, setInVirtualLayout, setLastMeasureSpec, setLength, setMaxHeight, setMaxWidth, setMeasureRequested, setMinHeight, setMinWidth, setOrigin, setParent, setType, setupDimensionRatio, setVerticalBiasPercent, setVerticalChainStyle, setVerticalDimension, setVerticalDimensionBehaviour, setVerticalMatchStyle, setVerticalWeight, setVisibility, setWidth, setWidthWrapContent, setWrapBehaviorInParent, setX, setY, toString, updateFromSolver

Methods inherited from class java.lang.Object

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

Field Detail

mDependencyGraph

public DependencyGraph mDependencyGraph

mMeasurer

protected BasicMeasure.Measurer mMeasurer

mMetrics

public Metrics mMetrics

mSystem

protected LinearSystem mSystem

mHorizontalChainsSize

public int mHorizontalChainsSize

mVerticalChainsSize

public int mVerticalChainsSize

mGroupsWrapOptimized

public boolean mGroupsWrapOptimized

mHorizontalWrapOptimized

public boolean mHorizontalWrapOptimized

mVerticalWrapOptimized

public boolean mVerticalWrapOptimized

mWrapFixedWidth

public int mWrapFixedWidth

mWrapFixedHeight

public int mWrapFixedHeight

mSkipSolver

public boolean mSkipSolver

mMeasure

public BasicMeasure.Measure mMeasure

Constructor Detail

ConstraintWidgetContainer

public ConstraintWidgetContainer()

Default constructor

ConstraintWidgetContainer

public ConstraintWidgetContainer(int x,
                                 int y,
                                 int width,
                                 int height)

Constructor

Parameters:

x - x position

y - y position

width - width of the layout

height - height of the layout

ConstraintWidgetContainer

public ConstraintWidgetContainer(int width,
                                 int height)

Constructor

Parameters:

width - width of the layout

height - height of the layout

ConstraintWidgetContainer

public ConstraintWidgetContainer(java.lang.String debugName,
                                 int width,
                                 int height)

Method Detail

invalidateGraph

public void invalidateGraph()

Invalidate the graph of constraints

invalidateMeasures

public void invalidateMeasures()

Invalidate the widgets measures

directMeasure

public boolean directMeasure(boolean optimizeWrap)

directMeasureSetup

public boolean directMeasureSetup(boolean optimizeWrap)

directMeasureWithOrientation

public boolean directMeasureWithOrientation(boolean optimizeWrap,
                                            int orientation)

defineTerminalWidgets

public void defineTerminalWidgets()

measure

public long measure(int optimizationLevel,
                    int widthMode,
                    int widthSize,
                    int heightMode,
                    int heightSize,
                    int lastMeasureWidth,
                    int lastMeasureHeight,
                    int paddingX,
                    int paddingY)

Measure the layout

updateHierarchy

public void updateHierarchy()

setMeasurer

public void setMeasurer(BasicMeasure.Measurer measurer)

getMeasurer

public BasicMeasure.Measurer getMeasurer()

fillMetrics

public void fillMetrics(Metrics metrics)

setOptimizationLevel

public void setOptimizationLevel(int value)

Resolves the system directly when possible

Parameters:

value - optimization level

getOptimizationLevel

public int getOptimizationLevel()

Returns the current optimization level

optimizeFor

public boolean optimizeFor(int feature)

Returns true if the given feature should be optimized

getType

public java.lang.String getType()

Specify the xml type for the container

Overrides:

getType in class ConstraintWidget

Returns:

type (null if not set)

reset

public void reset()

Overrides:

reset in class WidgetContainer

isWidthMeasuredTooSmall

public boolean isWidthMeasuredTooSmall()

Return true if the width given is too small for the content laid out

isHeightMeasuredTooSmall

public boolean isHeightMeasuredTooSmall()

Return true if the height given is too small for the content laid out

addHorizontalWrapMinVariable

public void addHorizontalWrapMinVariable(ConstraintAnchor left)

addHorizontalWrapMaxVariable

public void addHorizontalWrapMaxVariable(ConstraintAnchor right)

addChildrenToSolver

public boolean addChildrenToSolver(LinearSystem system)

Add this widget to the solver

Parameters:

system - the solver we want to add the widget to

updateChildrenFromSolver

public boolean updateChildrenFromSolver(LinearSystem system,
                                        boolean[] flags)

Update the frame of the layout and its children from the solver

Parameters:

system - the solver we get the values from.

updateFromRuns

public void updateFromRuns(boolean updateHorizontal,
                           boolean updateVertical)

Overrides:

updateFromRuns in class ConstraintWidget

setPadding

public void setPadding(int left,
                       int top,
                       int right,
                       int bottom)

Set the padding on this container. It will apply to the position of the children.

Parameters:

left - left padding

top - top padding

right - right padding

bottom - bottom padding

setRtl

public void setRtl(boolean isRtl)

Set the rtl status. This has implications for Chains.

Parameters:

isRtl - true if we are in RTL.

isRtl

public boolean isRtl()

Returns the rtl status.

Returns:

true if in RTL, false otherwise.

measure

public static boolean measure(int level,
                              ConstraintWidget widget,
                              BasicMeasure.Measurer measurer,
                              BasicMeasure.Measure measure,
                              int measureStrategy)

layout

public void layout()

Layout the tree of widgets

Overrides:

layout in class WidgetContainer

handlesInternalConstraints

public boolean handlesInternalConstraints()

Indicates if the container knows how to layout its content on its own

Returns:

true if the container does the layout, false otherwise

getVerticalGuidelines

public java.util.ArrayList<Guideline> getVerticalGuidelines()

Accessor to the vertical guidelines contained in the table.

Returns:

array of guidelines

getHorizontalGuidelines

public java.util.ArrayList<Guideline> getHorizontalGuidelines()

Accessor to the horizontal guidelines contained in the table.

Returns:

array of guidelines

getSystem

public LinearSystem getSystem()

setPass

public void setPass(int pass)

Keep track of the # of passes

getSceneString

public void getSceneString(java.lang.StringBuilder ret)

Overrides:

getSceneString in class ConstraintWidget