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      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 android.support.annotation.Nullable;
     21 import android.support.v7.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 
     33     public AlarmRecyclerView(Context context) {
     34         this(context, null);
     35     }
     36 
     37     public AlarmRecyclerView(Context context, @Nullable AttributeSet attrs) {
     38         this(context, attrs, 0);
     39     }
     40 
     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
     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
     60     public void requestLayout() {
     61         if (!mIgnoreRequestLayout &&
     62                 (getItemAnimator() == null || !getItemAnimator().isRunning())) {
     63             super.requestLayout();
     64         }
     65     }
     66 
     67 }