| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| package org.apache.weex.ui.view.listview; |
| |
| import android.content.Context; |
| import android.graphics.PointF; |
| import android.support.v7.widget.LinearLayoutManager; |
| import android.support.v7.widget.LinearSmoothScroller; |
| import android.support.v7.widget.RecyclerView; |
| |
| /** |
| * Created by moxun on 17/2/16. |
| */ |
| |
| public class ExtendedLinearLayoutManager extends LinearLayoutManager{ |
| |
| private RecyclerView.SmoothScroller smoothScroller; |
| |
| |
| private OnSmoothScrollEndListener onScrollEndListener; |
| |
| public ExtendedLinearLayoutManager(Context context) { |
| super(context, VERTICAL, false); |
| } |
| |
| public ExtendedLinearLayoutManager(Context context, int orientation, boolean reverseLayout) { |
| super(context, orientation, reverseLayout); |
| } |
| |
| @Override |
| public boolean supportsPredictiveItemAnimations() { |
| return false; |
| } |
| |
| public void onLayoutChildren(RecyclerView.Recycler recycler, RecyclerView.State state) { |
| try { |
| super.onLayoutChildren(recycler, state); |
| } catch (IndexOutOfBoundsException e) { |
| e.printStackTrace(); |
| |
| } |
| } |
| |
| @Override |
| public int scrollVerticallyBy(int dy, RecyclerView.Recycler recycler, RecyclerView.State state) { |
| try { |
| return super.scrollVerticallyBy(dy, recycler, state); |
| } catch (Exception e) { |
| e.printStackTrace(); |
| } |
| return 0; |
| } |
| |
| |
| @Override |
| public void smoothScrollToPosition(RecyclerView recyclerView, RecyclerView.State state, |
| int position) { |
| if (smoothScroller == null) { |
| smoothScroller = new ExtendedLinearLayoutManager.TopSnappedSmoothScroller(recyclerView.getContext()); |
| } |
| smoothScroller.setTargetPosition(position); |
| startSmoothScroll(smoothScroller); |
| } |
| |
| private class TopSnappedSmoothScroller extends LinearSmoothScroller { |
| public TopSnappedSmoothScroller(Context context) { |
| super(context); |
| |
| } |
| |
| @Override |
| public PointF computeScrollVectorForPosition(int targetPosition) { |
| return ExtendedLinearLayoutManager.this |
| .computeScrollVectorForPosition(targetPosition); |
| } |
| |
| @Override |
| protected int getVerticalSnapPreference() { |
| return SNAP_TO_START; |
| } |
| |
| @Override |
| protected void onStop() { |
| super.onStop(); |
| if(onScrollEndListener != null){ |
| onScrollEndListener.onStop(); |
| onScrollEndListener = null; |
| } |
| } |
| } |
| |
| public void setOnScrollEndListener(OnSmoothScrollEndListener onScrollEndListener) { |
| this.onScrollEndListener = onScrollEndListener; |
| } |
| |
| public interface OnSmoothScrollEndListener { |
| void onStop(); |
| } |
| } |