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
17package com.android.deskclock;
18
19import android.content.Context;
20import android.support.annotation.Nullable;
21import android.support.v7.widget.RecyclerView;
22import android.util.AttributeSet;
23import android.view.MotionEvent;
24
25/**
26 *  Thin wrapper around RecyclerView to prevent simultaneous layout passes, particularly during
27 *  animations.
28 */
29public 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}