1 /* 2 * Copyright (C) 2017 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 package com.android.documentsui.selection.demo; 17 18 import android.support.annotation.Nullable; 19 import android.support.v7.widget.RecyclerView; 20 import android.support.v7.widget.RecyclerView.ViewHolder; 21 import android.view.MotionEvent; 22 import android.view.View; 23 24 import com.android.documentsui.selection.ItemDetailsLookup; 25 26 /** 27 * Access to details of an item associated with a {@link MotionEvent} instance. 28 */ 29 final class DemoDetailsLookup extends ItemDetailsLookup { 30 31 private final RecyclerView mRecView; 32 DemoDetailsLookup(RecyclerView view)33 public DemoDetailsLookup(RecyclerView view) { 34 mRecView = view; 35 } 36 37 @Override overItem(MotionEvent e)38 public boolean overItem(MotionEvent e) { 39 return getItemPosition(e) != RecyclerView.NO_POSITION; 40 } 41 42 @Override overStableItem(MotionEvent e)43 public boolean overStableItem(MotionEvent e) { 44 return overItem(e) && getItemDetails(e).hasStableId(); 45 } 46 47 @Override inItemDragRegion(MotionEvent e)48 public boolean inItemDragRegion(MotionEvent e) { 49 return overItem(e) && getItemDetails(e).inDragRegion(e); 50 } 51 52 @Override inItemSelectRegion(MotionEvent e)53 public boolean inItemSelectRegion(MotionEvent e) { 54 return overItem(e) && getItemDetails(e).inSelectionHotspot(e); 55 } 56 57 @Override getItemPosition(MotionEvent e)58 public int getItemPosition(MotionEvent e) { 59 View child = mRecView.findChildViewUnder(e.getX(), e.getY()); 60 return (child != null) 61 ? mRecView.getChildAdapterPosition(child) 62 : RecyclerView.NO_POSITION; 63 } 64 65 @Override getItemDetails(MotionEvent e)66 public ItemDetails getItemDetails(MotionEvent e) { 67 @Nullable DemoHolder holder = getDemoHolder(e); 68 return holder == null ? null : holder.getItemDetails(); 69 } 70 getDemoHolder(MotionEvent e)71 private @Nullable DemoHolder getDemoHolder(MotionEvent e) { 72 View childView = mRecView.findChildViewUnder(e.getX(), e.getY()); 73 if (childView != null) { 74 ViewHolder holder = mRecView.getChildViewHolder(childView); 75 if (holder instanceof DemoHolder) { 76 return (DemoHolder) holder; 77 } 78 } 79 return null; 80 } 81 } 82