public class

HorizontalWidgetRun

extends WidgetRun

 java.lang.Object

androidx.constraintlayout.core.widgets.analyzer.WidgetRun

↳androidx.constraintlayout.core.widgets.analyzer.HorizontalWidgetRun

Gradle dependencies

compile group: 'androidx.constraintlayout', name: 'constraintlayout-core', version: '1.1.0-beta01'

  • groupId: androidx.constraintlayout
  • artifactId: constraintlayout-core
  • version: 1.1.0-beta01

Artifact androidx.constraintlayout:constraintlayout-core:1.1.0-beta01 it located at Google repository (https://maven.google.com/)

Summary

Fields
from WidgetRunend, matchConstraintsType, mDimensionBehavior, mRunType, orientation, start
Constructors
publicHorizontalWidgetRun(ConstraintWidget widget)

Methods
public voidapplyToWidget()

public java.lang.StringtoString()

public voidupdate(Dependency dependency)

from WidgetRunaddTarget, addTarget, getLimitedDimension, getTarget, getTarget, getWrapDimension, isCenterConnection, isDimensionResolved, isResolved, updateRunCenter, updateRunEnd, updateRunStart, wrapSize
from java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructors

public HorizontalWidgetRun(ConstraintWidget widget)

Methods

public java.lang.String toString()

public void update(Dependency dependency)

public void applyToWidget()

Source

/*
 * Copyright (C) 2019 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package androidx.constraintlayout.core.widgets.analyzer;

import static androidx.constraintlayout.core.widgets.ConstraintWidget.DimensionBehaviour.FIXED;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.DimensionBehaviour.MATCH_CONSTRAINT;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.DimensionBehaviour.MATCH_PARENT;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.HORIZONTAL;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.MATCH_CONSTRAINT_PERCENT;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.MATCH_CONSTRAINT_RATIO;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.MATCH_CONSTRAINT_SPREAD;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.MATCH_CONSTRAINT_WRAP;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.UNKNOWN;
import static androidx.constraintlayout.core.widgets.ConstraintWidget.VERTICAL;
import static androidx.constraintlayout.core.widgets.analyzer.WidgetRun.RunType.CENTER;

import androidx.constraintlayout.core.widgets.ConstraintAnchor;
import androidx.constraintlayout.core.widgets.ConstraintWidget;
import androidx.constraintlayout.core.widgets.Helper;

public class HorizontalWidgetRun extends WidgetRun {

    private static int[] sTempDimensions = new int[2];

    public HorizontalWidgetRun(ConstraintWidget widget) {
        super(widget);
        start.mType = DependencyNode.Type.LEFT;
        end.mType = DependencyNode.Type.RIGHT;
        this.orientation = HORIZONTAL;
    }

    @Override
    public String toString() {
        return "HorizontalRun " + mWidget.getDebugName();
    }

    @Override
    void clear() {
        mRunGroup = null;
        start.clear();
        end.clear();
        mDimension.clear();
        mResolved = false;
    }

    @Override
    void reset() {
        mResolved = false;
        start.clear();
        start.resolved = false;
        end.clear();
        end.resolved = false;
        mDimension.resolved = false;
    }

    @Override
    boolean supportsWrapComputation() {
        if (super.mDimensionBehavior == ConstraintWidget.DimensionBehaviour.MATCH_CONSTRAINT) {
            if (super.mWidget.mMatchConstraintDefaultWidth == MATCH_CONSTRAINT_SPREAD) {
                return true;
            }
            return false;
        }
        return true;
    }

    @Override
    void apply() {
        if (mWidget.measured) {
            mDimension.resolve(mWidget.getWidth());
        }
        if (!mDimension.resolved) {
            super.mDimensionBehavior = mWidget.getHorizontalDimensionBehaviour();
            if (super.mDimensionBehavior != ConstraintWidget.DimensionBehaviour.MATCH_CONSTRAINT) {
                if (mDimensionBehavior == MATCH_PARENT) {
                    ConstraintWidget parent = mWidget.getParent();
                    if (parent != null
                            && (parent.getHorizontalDimensionBehaviour() == FIXED
                            || parent.getHorizontalDimensionBehaviour() == MATCH_PARENT)) {
                        int resolvedDimension = parent.getWidth()
                                - mWidget.mLeft.getMargin() - mWidget.mRight.getMargin();
                        addTarget(start, parent.mHorizontalRun.start, mWidget.mLeft.getMargin());
                        addTarget(end, parent.mHorizontalRun.end, -mWidget.mRight.getMargin());
                        mDimension.resolve(resolvedDimension);
                        return;
                    }
                }
                if (mDimensionBehavior == FIXED) {
                    mDimension.resolve(mWidget.getWidth());
                }
            }
        } else {
            if (mDimensionBehavior == MATCH_PARENT) {
                ConstraintWidget parent = mWidget.getParent();
                if (parent != null
                        && (parent.getHorizontalDimensionBehaviour() == FIXED
                        || parent.getHorizontalDimensionBehaviour() == MATCH_PARENT)) {
                    addTarget(start, parent.mHorizontalRun.start, mWidget.mLeft.getMargin());
                    addTarget(end, parent.mHorizontalRun.end, -mWidget.mRight.getMargin());
                    return;
                }
            }
        }

        // three basic possibilities:
        // <-s-e->
        // <-s-e
        //   s-e->
        // and a variation if the dimension is not yet known:
        // <-s-d-e->
        // <-s<-d<-e
        //   s->d->e->

        if (mDimension.resolved && mWidget.measured) {
            if (mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].mTarget != null
                    && mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].mTarget
                    != null) { // <-s-e->
                if (mWidget.isInHorizontalChain()) {
                    start.mMargin = mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].getMargin();
                    end.mMargin = -mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].getMargin();
                } else {
                    DependencyNode startTarget =
                            getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT]);
                    if (startTarget != null) {
                        addTarget(start, startTarget,
                                mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].getMargin());
                    }
                    DependencyNode endTarget =
                            getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT]);
                    if (endTarget != null) {
                        addTarget(end, endTarget,
                                -mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].getMargin());
                    }
                    start.delegateToWidgetRun = true;
                    end.delegateToWidgetRun = true;
                }
            } else if (mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].mTarget
                    != null) { // <-s-e
                DependencyNode target =
                        getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT]);
                if (target != null) {
                    addTarget(start, target,
                            mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].getMargin());
                    addTarget(end, start, mDimension.value);
                }
            } else if (mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].mTarget
                    != null) {   //   s-e->
                DependencyNode target =
                        getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT]);
                if (target != null) {
                    addTarget(end, target,
                            -mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].getMargin());
                    addTarget(start, end, -mDimension.value);
                }
            } else {
                // no connections, nothing to do.
                if (!(mWidget instanceof Helper) && mWidget.getParent() != null
                        && mWidget.getAnchor(ConstraintAnchor.Type.CENTER).mTarget == null) {
                    DependencyNode left = mWidget.getParent().mHorizontalRun.start;
                    addTarget(start, left, mWidget.getX());
                    addTarget(end, start, mDimension.value);
                }
            }
        } else {
            if (mDimensionBehavior == MATCH_CONSTRAINT) {
                switch (mWidget.mMatchConstraintDefaultWidth) {
                    case MATCH_CONSTRAINT_RATIO: {
                        if (mWidget.mMatchConstraintDefaultHeight == MATCH_CONSTRAINT_RATIO
                        ) {
                            // need to look into both side
                            start.updateDelegate = this;
                            end.updateDelegate = this;
                            mWidget.mVerticalRun.start.updateDelegate = this;
                            mWidget.mVerticalRun.end.updateDelegate = this;
                            mDimension.updateDelegate = this;

                            if (mWidget.isInVerticalChain()) {
                                mDimension.mTargets.add(mWidget.mVerticalRun.mDimension);
                                mWidget.mVerticalRun.mDimension.mDependencies.add(mDimension);
                                mWidget.mVerticalRun.mDimension.updateDelegate = this;
                                mDimension.mTargets.add(mWidget.mVerticalRun.start);
                                mDimension.mTargets.add(mWidget.mVerticalRun.end);
                                mWidget.mVerticalRun.start.mDependencies.add(mDimension);
                                mWidget.mVerticalRun.end.mDependencies.add(mDimension);
                            } else if (mWidget.isInHorizontalChain()) {
                                mWidget.mVerticalRun.mDimension.mTargets.add(mDimension);
                                mDimension.mDependencies.add(mWidget.mVerticalRun.mDimension);
                            } else {
                                mWidget.mVerticalRun.mDimension.mTargets.add(mDimension);
                            }
                            break;
                        }
                        // we have a ratio, but we depend on the other side computation
                        DependencyNode targetDimension = mWidget.mVerticalRun.mDimension;
                        mDimension.mTargets.add(targetDimension);
                        targetDimension.mDependencies.add(mDimension);
                        mWidget.mVerticalRun.start.mDependencies.add(mDimension);
                        mWidget.mVerticalRun.end.mDependencies.add(mDimension);
                        mDimension.delegateToWidgetRun = true;
                        mDimension.mDependencies.add(start);
                        mDimension.mDependencies.add(end);
                        start.mTargets.add(mDimension);
                        end.mTargets.add(mDimension);
                    }
                    break;
                    case MATCH_CONSTRAINT_PERCENT: {
                        // we need to look up the parent dimension
                        ConstraintWidget parent = mWidget.getParent();
                        if (parent == null) {
                            break;
                        }
                        DependencyNode targetDimension = parent.mVerticalRun.mDimension;
                        mDimension.mTargets.add(targetDimension);
                        targetDimension.mDependencies.add(mDimension);
                        mDimension.delegateToWidgetRun = true;
                        mDimension.mDependencies.add(start);
                        mDimension.mDependencies.add(end);
                    }
                    break;
                    case MATCH_CONSTRAINT_SPREAD: {
                        // the work is done in the update()
                    }
                    break;
                    default:
                        break;
                }
            }
            if (mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].mTarget != null
                    && mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].mTarget
                    != null) { // <-s-d-e->

                if (mWidget.isInHorizontalChain()) {
                    start.mMargin = mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].getMargin();
                    end.mMargin = -mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].getMargin();
                } else {
                    DependencyNode startTarget =
                            getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT]);
                    DependencyNode endTarget =
                            getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT]);
                    if (false) {
                        if (startTarget != null) {
                            addTarget(start, startTarget,
                                    mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].getMargin());
                        }
                        if (endTarget != null) {
                            addTarget(end, endTarget,
                                    -mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT]
                                            .getMargin());
                        }
                    } else {
                        if (startTarget != null) {
                            startTarget.addDependency(this);
                        }
                        if (endTarget != null) {
                            endTarget.addDependency(this);
                        }
                    }
                    mRunType = CENTER;
                }
            } else if (mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].mTarget
                    != null) { // <-s<-d<-e
                DependencyNode target =
                        getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT]);
                if (target != null) {
                    addTarget(start, target,
                            mWidget.mListAnchors[ConstraintWidget.ANCHOR_LEFT].getMargin());
                    addTarget(end, start, 1, mDimension);
                }
            } else if (mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].mTarget
                    != null) {   //   s->d->e->
                DependencyNode target =
                        getTarget(mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT]);
                if (target != null) {
                    addTarget(end, target,
                            -mWidget.mListAnchors[ConstraintWidget.ANCHOR_RIGHT].getMargin());
                    addTarget(start, end, -1, mDimension);
                }
            } else {
                // no connections, nothing to do.
                if (!(mWidget instanceof Helper) && mWidget.getParent() != null) {
                    DependencyNode left = mWidget.getParent().mHorizontalRun.start;
                    addTarget(start, left, mWidget.getX());
                    addTarget(end, start, 1, mDimension);
                }
            }
        }
    }

    private void computeInsetRatio(int[] dimensions,
            int x1,
            int x2,
            int y1,
            int y2,
            float ratio,
            int side) {
        int dx = x2 - x1;
        int dy = y2 - y1;
        switch (side) {
            case UNKNOWN: {
                int candidateX1 = (int) (0.5f + dy * ratio);
                int candidateY1 = dy;
                int candidateX2 = dx;
                int candidateY2 = (int) (0.5f + dx / ratio);
                if (candidateX1 <= dx && candidateY1 <= dy) {
                    dimensions[HORIZONTAL] = candidateX1;
                    dimensions[VERTICAL] = candidateY1;
                } else if (candidateX2 <= dx && candidateY2 <= dy) {
                    dimensions[HORIZONTAL] = candidateX2;
                    dimensions[VERTICAL] = candidateY2;
                }
            }
            break;
            case HORIZONTAL: {
                int horizontalSide = (int) (0.5f + dy * ratio);
                dimensions[HORIZONTAL] = horizontalSide;
                dimensions[VERTICAL] = dy;
            }
            break;
            case VERTICAL: {
                int verticalSide = (int) (0.5f + dx * ratio);
                dimensions[HORIZONTAL] = dx;
                dimensions[VERTICAL] = verticalSide;
            }
            break;
            default:
                break;
        }
    }

    @Override
    public void update(Dependency dependency) {
        switch (mRunType) {
            case START: {
                updateRunStart(dependency);
            }
            break;
            case END: {
                updateRunEnd(dependency);
            }
            break;
            case CENTER: {
                updateRunCenter(dependency, mWidget.mLeft, mWidget.mRight, HORIZONTAL);
                return;
            }
            default:
                break;
        }

        if (!mDimension.resolved) {
            if (mDimensionBehavior == MATCH_CONSTRAINT) {
                switch (mWidget.mMatchConstraintDefaultWidth) {
                    case MATCH_CONSTRAINT_RATIO: {
                        if (mWidget.mMatchConstraintDefaultHeight == MATCH_CONSTRAINT_SPREAD
                                || mWidget.mMatchConstraintDefaultHeight
                                == MATCH_CONSTRAINT_RATIO) {
                            DependencyNode secondStart = mWidget.mVerticalRun.start;
                            DependencyNode secondEnd = mWidget.mVerticalRun.end;
                            boolean s1 = mWidget.mLeft.mTarget != null;
                            boolean s2 = mWidget.mTop.mTarget != null;
                            boolean e1 = mWidget.mRight.mTarget != null;
                            boolean e2 = mWidget.mBottom.mTarget != null;

                            int definedSide = mWidget.getDimensionRatioSide();

                            if (s1 && s2 && e1 && e2) {
                                float ratio = mWidget.getDimensionRatio();
                                if (secondStart.resolved && secondEnd.resolved) {
                                    if (!(start.readyToSolve && end.readyToSolve)) {
                                        return;
                                    }
                                    int x1 = start.mTargets.get(0).value + start.mMargin;
                                    int x2 = end.mTargets.get(0).value - end.mMargin;
                                    int y1 = secondStart.value + secondStart.mMargin;
                                    int y2 = secondEnd.value - secondEnd.mMargin;
                                    computeInsetRatio(sTempDimensions,
                                            x1, x2, y1, y2, ratio, definedSide);
                                    mDimension.resolve(sTempDimensions[HORIZONTAL]);
                                    mWidget.mVerticalRun.mDimension
                                            .resolve(sTempDimensions[VERTICAL]);
                                    return;
                                }
                                if (start.resolved && end.resolved) {
                                    if (!(secondStart.readyToSolve && secondEnd.readyToSolve)) {
                                        return;
                                    }
                                    int x1 = start.value + start.mMargin;
                                    int x2 = end.value - end.mMargin;
                                    int y1 = secondStart.mTargets.get(0).value
                                            + secondStart.mMargin;
                                    int y2 = secondEnd.mTargets.get(0).value - secondEnd.mMargin;
                                    computeInsetRatio(sTempDimensions,
                                            x1, x2, y1, y2, ratio, definedSide);
                                    mDimension.resolve(sTempDimensions[HORIZONTAL]);
                                    mWidget.mVerticalRun.mDimension
                                            .resolve(sTempDimensions[VERTICAL]);
                                }
                                if (!(start.readyToSolve && end.readyToSolve
                                        && secondStart.readyToSolve
                                        && secondEnd.readyToSolve)) {
                                    return;
                                }
                                int x1 = start.mTargets.get(0).value + start.mMargin;
                                int x2 = end.mTargets.get(0).value - end.mMargin;
                                int y1 = secondStart.mTargets.get(0).value + secondStart.mMargin;
                                int y2 = secondEnd.mTargets.get(0).value - secondEnd.mMargin;
                                computeInsetRatio(sTempDimensions,
                                        x1, x2, y1, y2, ratio, definedSide);
                                mDimension.resolve(sTempDimensions[HORIZONTAL]);
                                mWidget.mVerticalRun.mDimension.resolve(sTempDimensions[VERTICAL]);
                            } else if (s1 && e1) {
                                if (!(start.readyToSolve && end.readyToSolve)) {
                                    return;
                                }
                                float ratio = mWidget.getDimensionRatio();
                                int x1 = start.mTargets.get(0).value + start.mMargin;
                                int x2 = end.mTargets.get(0).value - end.mMargin;

                                switch (definedSide) {
                                    case UNKNOWN:
                                    case HORIZONTAL: {
                                        int dx = x2 - x1;
                                        int ldx = getLimitedDimension(dx, HORIZONTAL);
                                        int dy = (int) (0.5f + ldx * ratio);
                                        int ldy = getLimitedDimension(dy, VERTICAL);
                                        if (dy != ldy) {
                                            ldx = (int) (0.5f + ldy / ratio);
                                        }
                                        mDimension.resolve(ldx);
                                        mWidget.mVerticalRun.mDimension.resolve(ldy);
                                    }
                                    break;
                                    case VERTICAL: {
                                        int dx = x2 - x1;
                                        int ldx = getLimitedDimension(dx, HORIZONTAL);
                                        int dy = (int) (0.5f + ldx / ratio);
                                        int ldy = getLimitedDimension(dy, VERTICAL);
                                        if (dy != ldy) {
                                            ldx = (int) (0.5f + ldy * ratio);
                                        }
                                        mDimension.resolve(ldx);
                                        mWidget.mVerticalRun.mDimension.resolve(ldy);
                                    }
                                    break;
                                    default:
                                        break;
                                }
                            } else if (s2 && e2) {
                                if (!(secondStart.readyToSolve && secondEnd.readyToSolve)) {
                                    return;
                                }
                                float ratio = mWidget.getDimensionRatio();
                                int y1 = secondStart.mTargets.get(0).value + secondStart.mMargin;
                                int y2 = secondEnd.mTargets.get(0).value - secondEnd.mMargin;

                                switch (definedSide) {
                                    case UNKNOWN:
                                    case VERTICAL: {
                                        int dy = y2 - y1;
                                        int ldy = getLimitedDimension(dy, VERTICAL);
                                        int dx = (int) (0.5f + ldy / ratio);
                                        int ldx = getLimitedDimension(dx, HORIZONTAL);
                                        if (dx != ldx) {
                                            ldy = (int) (0.5f + ldx * ratio);
                                        }
                                        mDimension.resolve(ldx);
                                        mWidget.mVerticalRun.mDimension.resolve(ldy);
                                    }
                                    break;
                                    case HORIZONTAL: {
                                        int dy = y2 - y1;
                                        int ldy = getLimitedDimension(dy, VERTICAL);
                                        int dx = (int) (0.5f + ldy * ratio);
                                        int ldx = getLimitedDimension(dx, HORIZONTAL);
                                        if (dx != ldx) {
                                            ldy = (int) (0.5f + ldx / ratio);
                                        }
                                        mDimension.resolve(ldx);
                                        mWidget.mVerticalRun.mDimension.resolve(ldy);
                                    }
                                    break;
                                    default:
                                        break;
                                }
                            }
                        } else {
                            int size = 0;
                            int ratioSide = mWidget.getDimensionRatioSide();
                            switch (ratioSide) {
                                case HORIZONTAL: {
                                    size = (int) (0.5f + mWidget.mVerticalRun.mDimension.value
                                            / mWidget.getDimensionRatio());
                                }
                                break;
                                case ConstraintWidget.VERTICAL: {
                                    size = (int) (0.5f + mWidget.mVerticalRun.mDimension.value
                                            * mWidget.getDimensionRatio());
                                }
                                break;
                                case ConstraintWidget.UNKNOWN: {
                                    size = (int) (0.5f + mWidget.mVerticalRun.mDimension.value
                                            * mWidget.getDimensionRatio());
                                }
                                break;
                                default:
                                    break;
                            }
                            mDimension.resolve(size);
                        }
                    }
                    break;
                    case MATCH_CONSTRAINT_PERCENT: {
                        ConstraintWidget parent = mWidget.getParent();
                        if (parent != null) {
                            if (parent.mHorizontalRun.mDimension.resolved) {
                                float percent = mWidget.mMatchConstraintPercentWidth;
                                int targetDimensionValue = parent.mHorizontalRun.mDimension.value;
                                int size = (int) (0.5f + targetDimensionValue * percent);
                                mDimension.resolve(size);
                            }
                        }
                    }
                    break;
                    default:
                        break;
                }
            }
        }

        if (!(start.readyToSolve && end.readyToSolve)) {
            return;
        }

        if (start.resolved && end.resolved && mDimension.resolved) {
            return;
        }

        if (!mDimension.resolved
                && mDimensionBehavior == MATCH_CONSTRAINT
                && mWidget.mMatchConstraintDefaultWidth == MATCH_CONSTRAINT_SPREAD
                && !mWidget.isInHorizontalChain()) {

            DependencyNode startTarget = start.mTargets.get(0);
            DependencyNode endTarget = end.mTargets.get(0);
            int startPos = startTarget.value + start.mMargin;
            int endPos = endTarget.value + end.mMargin;

            int distance = endPos - startPos;
            start.resolve(startPos);
            end.resolve(endPos);
            mDimension.resolve(distance);
            return;
        }

        if (!mDimension.resolved
                && mDimensionBehavior == MATCH_CONSTRAINT
                && matchConstraintsType == MATCH_CONSTRAINT_WRAP) {
            if (start.mTargets.size() > 0 && end.mTargets.size() > 0) {
                DependencyNode startTarget = start.mTargets.get(0);
                DependencyNode endTarget = end.mTargets.get(0);
                int startPos = startTarget.value + start.mMargin;
                int endPos = endTarget.value + end.mMargin;
                int availableSpace = endPos - startPos;
                int value = Math.min(availableSpace, mDimension.wrapValue);
                int max = mWidget.mMatchConstraintMaxWidth;
                int min = mWidget.mMatchConstraintMinWidth;
                value = Math.max(min, value);
                if (max > 0) {
                    value = Math.min(max, value);
                }
                mDimension.resolve(value);
            }
        }

        if (!mDimension.resolved) {
            return;
        }
        // ready to solve, centering.
        DependencyNode startTarget = start.mTargets.get(0);
        DependencyNode endTarget = end.mTargets.get(0);
        int startPos = startTarget.value + start.mMargin;
        int endPos = endTarget.value + end.mMargin;
        float bias = mWidget.getHorizontalBiasPercent();
        if (startTarget == endTarget) {
            startPos = startTarget.value;
            endPos = endTarget.value;
            // TODO: this might be a nice feature to support, but I guess for now let's stay
            // compatible with 1.1
            bias = 0.5f;
        }
        int distance = (endPos - startPos - mDimension.value);
        start.resolve((int) (0.5f + startPos + distance * bias));
        end.resolve(start.value + mDimension.value);
    }

    // @TODO: add description
    @Override
    public void applyToWidget() {
        if (start.resolved) {
            mWidget.setX(start.value);
        }
    }

}