1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package androidx.constraintlayout.core.state; 18 19 import androidx.constraintlayout.core.state.helpers.Facade; 20 import androidx.constraintlayout.core.widgets.ConstraintWidget; 21 import androidx.constraintlayout.core.widgets.HelperWidget; 22 23 import java.util.ArrayList; 24 import java.util.Collections; 25 26 public class HelperReference extends ConstraintReference implements Facade { 27 protected final State mHelperState; 28 final State.Helper mType; 29 protected ArrayList<Object> mReferences = new ArrayList<>(); 30 private HelperWidget mHelperWidget; 31 HelperReference(State state, State.Helper type)32 public HelperReference(State state, State.Helper type) { 33 super(state); 34 mHelperState = state; 35 mType = type; 36 } 37 getType()38 public State.Helper getType() { 39 return mType; 40 } 41 42 // @TODO: add description add(Object... objects)43 public HelperReference add(Object... objects) { 44 Collections.addAll(mReferences, objects); 45 return this; 46 } 47 setHelperWidget(HelperWidget helperWidget)48 public void setHelperWidget(HelperWidget helperWidget) { 49 mHelperWidget = helperWidget; 50 } 51 getHelperWidget()52 public HelperWidget getHelperWidget() { 53 return mHelperWidget; 54 } 55 56 @Override getConstraintWidget()57 public ConstraintWidget getConstraintWidget() { 58 return getHelperWidget(); 59 } 60 61 // @TODO: add description 62 @Override apply()63 public void apply() { 64 // nothing 65 } 66 67 /** 68 * Allows the derived classes to invoke the apply method in the ConstraintReference 69 */ applyBase()70 public void applyBase() { 71 super.apply(); 72 } 73 } 74