Garfield Tan | 7d75f7b | 2016-09-20 16:33:24 -0700 | [diff] [blame] | 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.documentsui.sidebar; |
| 18 | |
| 19 | import android.app.Activity; |
| 20 | import android.os.Looper; |
| 21 | import android.view.View; |
| 22 | import android.view.View.OnDragListener; |
| 23 | import android.view.ViewGroup; |
| 24 | import android.widget.ArrayAdapter; |
| 25 | |
| 26 | import com.android.documentsui.R; |
| 27 | |
| 28 | import java.util.HashMap; |
| 29 | import java.util.List; |
| 30 | import java.util.Map; |
| 31 | |
| 32 | /** |
| 33 | * The adapter for the {@link android.widget.ListView} in sidebar. It contains the list of |
| 34 | * {@link Item}s and provides sub-views to {@link android.widget.ListView}. |
| 35 | */ |
| 36 | class RootsAdapter extends ArrayAdapter<Item> { |
| 37 | private static final Map<String, Long> sIdMap = new HashMap<>(); |
| 38 | // the next available id to associate with a new string id |
| 39 | private static long sNextAvailableId; |
| 40 | |
| 41 | private final OnDragListener mDragListener; |
| 42 | |
| 43 | public RootsAdapter( |
| 44 | Activity activity, |
| 45 | List<Item> items, |
| 46 | OnDragListener dragListener) { |
| 47 | super(activity, 0, items); |
| 48 | |
| 49 | mDragListener = dragListener; |
| 50 | } |
| 51 | |
| 52 | @Override |
| 53 | public boolean hasStableIds() { |
| 54 | return true; |
| 55 | } |
| 56 | |
| 57 | @Override |
| 58 | public long getItemId(int position) { |
| 59 | // Ensure this method is only called in main thread because we don't have any |
| 60 | // concurrency protection. |
| 61 | assert(Looper.myLooper() == Looper.getMainLooper()); |
| 62 | |
| 63 | String stringId = getItem(position).stringId; |
| 64 | |
| 65 | long id; |
| 66 | if (sIdMap.containsKey(stringId)) { |
| 67 | id = sIdMap.get(stringId); |
| 68 | } else { |
| 69 | id = sNextAvailableId++; |
| 70 | sIdMap.put(stringId, id); |
| 71 | } |
| 72 | |
| 73 | return id; |
| 74 | } |
| 75 | |
| 76 | @Override |
| 77 | public View getView(int position, View convertView, ViewGroup parent) { |
| 78 | final Item item = getItem(position); |
| 79 | final View view = item.getView(convertView, parent); |
| 80 | |
| 81 | if (item.isDropTarget()) { |
| 82 | view.setTag(R.id.item_position_tag, position); |
| 83 | view.setOnDragListener(mDragListener); |
| 84 | } else { |
| 85 | view.setTag(R.id.item_position_tag, null); |
| 86 | view.setOnDragListener(null); |
| 87 | } |
| 88 | return view; |
| 89 | } |
| 90 | |
| 91 | @Override |
| 92 | public boolean areAllItemsEnabled() { |
| 93 | return false; |
| 94 | } |
| 95 | |
| 96 | @Override |
| 97 | public boolean isEnabled(int position) { |
| 98 | return getItemViewType(position) != 1; |
| 99 | } |
| 100 | |
| 101 | @Override |
| 102 | public int getItemViewType(int position) { |
| 103 | final Item item = getItem(position); |
| 104 | if (item instanceof RootItem || item instanceof AppItem) { |
| 105 | return 0; |
| 106 | } else { |
| 107 | return 1; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | @Override |
| 112 | public int getViewTypeCount() { |
| 113 | return 2; |
| 114 | } |
| 115 | } |