1 /* 2 * Copyright (C) 2016 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 com.android.deskclock; 18 19 import android.content.Context; 20 import androidx.annotation.Nullable; 21 import androidx.recyclerview.widget.RecyclerView; 22 import android.util.AttributeSet; 23 import android.view.MotionEvent; 24 25 /** 26 * Thin wrapper around RecyclerView to prevent simultaneous layout passes, particularly during 27 * animations. 28 */ 29 public class AlarmRecyclerView extends RecyclerView { 30 31 private boolean mIgnoreRequestLayout; 32 AlarmRecyclerView(Context context)33 public AlarmRecyclerView(Context context) { 34 this(context, null); 35 } 36 AlarmRecyclerView(Context context, @Nullable AttributeSet attrs)37 public AlarmRecyclerView(Context context, @Nullable AttributeSet attrs) { 38 this(context, attrs, 0); 39 } 40 AlarmRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle)41 public AlarmRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) { 42 super(context, attrs, defStyle); 43 addOnItemTouchListener(new RecyclerView.SimpleOnItemTouchListener() { 44 @Override 45 public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) { 46 // Disable scrolling/user action to prevent choppy animations. 47 return rv.getItemAnimator().isRunning(); 48 } 49 }); 50 } 51 52 @Override onLayout(boolean changed, int left, int top, int right, int bottom)53 protected void onLayout(boolean changed, int left, int top, int right, int bottom) { 54 mIgnoreRequestLayout = true; 55 super.onLayout(changed, left, top, right, bottom); 56 mIgnoreRequestLayout = false; 57 } 58 59 @Override requestLayout()60 public void requestLayout() { 61 if (!mIgnoreRequestLayout && 62 (getItemAnimator() == null || !getItemAnimator().isRunning())) { 63 super.requestLayout(); 64 } 65 } 66 67 }