72 lines
2.5 KiB
Java
72 lines
2.5 KiB
Java
/*
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* Copyright 2018 GcsSloop
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Last modified 2018-04-09 23:56:59
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*
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* GitHub: https://github.com/GcsSloop
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* WeiBo: http://weibo.com/GcsSloop
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* WebSite: http://www.gcssloop.com
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*/
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package com.shayu.onetoone.widget;
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import android.util.DisplayMetrics;
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import android.view.View;
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import androidx.annotation.NonNull;
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import androidx.recyclerview.widget.LinearSmoothScroller;
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import androidx.recyclerview.widget.RecyclerView;
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import static com.shayu.onetoone.widget.PagerConfig.Logi;
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/**
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* 作用：用于处理平滑滚动
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* 作者：GcsSloop
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* 摘要：用于用户手指抬起后页面对齐或者 Fling 事件。
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*/
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public class PagerGridSmoothScroller extends LinearSmoothScroller {
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private RecyclerView mRecyclerView;
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public PagerGridSmoothScroller(@NonNull RecyclerView recyclerView) {
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super(recyclerView.getContext());
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mRecyclerView = recyclerView;
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}
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@Override
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protected void onTargetFound(View targetView, RecyclerView.State state, Action action) {
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RecyclerView.LayoutManager manager = mRecyclerView.getLayoutManager();
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if (null == manager) return;
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if (manager instanceof PagerGridLayoutManager) {
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PagerGridLayoutManager layoutManager = (PagerGridLayoutManager) manager;
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int pos = mRecyclerView.getChildAdapterPosition(targetView);
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int[] snapDistances = layoutManager.getSnapOffset(pos);
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final int dx = snapDistances[0];
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final int dy = snapDistances[1];
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Logi("dx = " + dx);
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Logi("dy = " + dy);
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final int time = calculateTimeForScrolling(Math.max(Math.abs(dx), Math.abs(dy)));
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if (time > 0) {
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action.update(dx, dy, time, mDecelerateInterpolator);
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}
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}
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}
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@Override
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protected float calculateSpeedPerPixel(DisplayMetrics displayMetrics) {
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return PagerConfig.getMillisecondsPreInch() / displayMetrics.densityDpi;
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}
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}
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