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      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.isRoot()) {
     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 }
    116