public class

VerticalChainReference

extends ChainReference

Gradle dependencies

compile group: 'androidx.constraintlayout', name: 'constraintlayout-core', version: '1.1.0-alpha01'

  • groupId: androidx.constraintlayout
  • artifactId: constraintlayout-core
  • version: 1.1.0-alpha01

Artifact androidx.constraintlayout:constraintlayout-core:1.1.0-alpha01 it located at Google repository (https://maven.google.com/)

Summary

Fields
from ChainReferencemBias, mStyle
from HelperReferencemReferences, mState
from ConstraintReferencemBottomToBottom, mBottomToTop, mEndToEnd, mEndToStart, mLeftToLeft, mLeftToRight, mMarginBottom, mMarginBottomGone, mMarginEnd, mMarginEndGone, mMarginLeft, mMarginLeftGone, mMarginRight, mMarginRightGone, mMarginStart, mMarginStartGone, mMarginTop, mMarginTopGone, mRightToLeft, mRightToRight, mStartToEnd, mStartToStart, mTopToBottom, mTopToTop
Constructors
publicVerticalChainReference(State state)

Methods
public voidapply()

from ChainReferencebias, getBias, getStyle, style
from HelperReferenceadd, getConstraintWidget, getHelperWidget, getType, setHelperWidget
from ConstraintReferenceaddCustomColor, addCustomFloat, alpha, baseline, baselineToBaseline, baselineToBottom, baselineToTop, bottom, bottomToBottom, bottomToTop, centerHorizontally, centerVertically, circularConstraint, clear, clearHorizontal, clearVertical, createConstraintWidget, end, endToEnd, endToStart, getAlpha, getFacade, getHeight, getHorizontalChainStyle, getHorizontalChainWeight, getKey, getPivotX, getPivotY, getRotationX, getRotationY, getRotationZ, getScaleX, getScaleY, getTag, getTranslationX, getTranslationY, getTranslationZ, getVerticalChainStyle, getVerticalChainWeight, getView, getWidth, height, horizontalBias, left, leftToLeft, leftToRight, margin, margin, marginGone, marginGone, pivotX, pivotY, right, rightToLeft, rightToRight, rotationX, rotationY, rotationZ, scaleX, scaleY, setConstraintWidget, setFacade, setHeight, setHorizontalChainStyle, setHorizontalChainWeight, setKey, setTag, setVerticalChainStyle, setVerticalChainWeight, setView, setWidth, start, startToEnd, startToStart, top, topToBottom, topToTop, translationX, translationY, translationZ, validate, verticalBias, visibility, width
from java.lang.Objectclone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructors

public VerticalChainReference(State state)

Methods

public void apply()

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.state.helpers;

import androidx.constraintlayout.core.state.ConstraintReference;
import androidx.constraintlayout.core.state.State;
import androidx.constraintlayout.core.widgets.ConstraintWidget;

public class VerticalChainReference extends ChainReference {

    public VerticalChainReference(State state) {
        super(state, State.Helper.VERTICAL_CHAIN);
    }

    /**
     * @TODO: add description
     */
    public void apply() {
        ConstraintReference first = null;
        ConstraintReference previous = null;
        for (Object key : mReferences) {
            ConstraintReference reference = mState.constraints(key);
            reference.clearVertical();
        }

        for (Object key : mReferences) {
            ConstraintReference reference = mState.constraints(key);
            if (first == null) {
                first = reference;
                if (mTopToTop != null) {
                    first.topToTop(mTopToTop).margin(mMarginTop).marginGone(mMarginTopGone);
                } else if (mTopToBottom != null) {
                    first.topToBottom(mTopToBottom).margin(mMarginTop).marginGone(mMarginTopGone);
                } else {
                    // No constraint declared, default to Parent.
                    first.topToTop(State.PARENT);
                }
            }
            if (previous != null) {
                previous.bottomToTop(reference.getKey());
                reference.topToBottom(previous.getKey());
            }
            previous = reference;
        }

        if (previous != null) {
            if (mBottomToTop != null) {
                previous.bottomToTop(mBottomToTop)
                        .margin(mMarginBottom)
                        .marginGone(mMarginBottomGone);
            } else if (mBottomToBottom != null) {
                previous.bottomToBottom(mBottomToBottom)
                        .margin(mMarginBottom)
                        .marginGone(mMarginBottomGone);
            } else {
                // No constraint declared, default to Parent.
                previous.bottomToBottom(State.PARENT);
            }
        }

        if (first == null) {
            return;
        }

        if (mBias != 0.5f) {
            first.verticalBias(mBias);
        }

        switch (mStyle) {
            case SPREAD: {
                first.setVerticalChainStyle(ConstraintWidget.CHAIN_SPREAD);
            }
            break;
            case SPREAD_INSIDE: {
                first.setVerticalChainStyle(ConstraintWidget.CHAIN_SPREAD_INSIDE);
            }
            break;
            case PACKED: {
                first.setVerticalChainStyle(ConstraintWidget.CHAIN_PACKED);
            }
        }
    }
}