1 /* 2 * Copyright 2018 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 package androidx.recyclerview.widget; 17 18 19 import android.view.View; 20 21 import androidx.annotation.NonNull; 22 23 import java.util.ArrayList; 24 import java.util.List; 25 26 /** 27 * Simple class that can collect list of view attach and detach events so that we can assert on them 28 */ 29 public class AttachDetachCollector implements RecyclerView.OnChildAttachStateChangeListener { 30 private final List<View> mAttached = new ArrayList<>(); 31 private final List<View> mDetached = new ArrayList<>(); 32 33 public AttachDetachCollector(RecyclerView recyclerView) { 34 recyclerView.addOnChildAttachStateChangeListener(this); 35 } 36 37 @Override 38 public void onChildViewAttachedToWindow(@NonNull View view) { 39 mAttached.add(view); 40 } 41 42 @Override 43 public void onChildViewDetachedFromWindow(@NonNull View view) { 44 mDetached.add(view); 45 } 46 47 public void reset() { 48 mAttached.clear(); 49 mDetached.clear(); 50 } 51 52 public List<View> getAttached() { 53 return mAttached; 54 } 55 56 public List<View> getDetached() { 57 return mDetached; 58 } 59 } 60
