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      1 /*
      2  * Copyright (C) 2015 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.setupwizardlib.items;
     18 
     19 import android.content.res.TypedArray;
     20 import android.graphics.drawable.Drawable;
     21 import android.graphics.drawable.LayerDrawable;
     22 import android.support.v7.widget.RecyclerView;
     23 import android.util.Log;
     24 import android.view.LayoutInflater;
     25 import android.view.View;
     26 import android.view.ViewGroup;
     27 
     28 import com.android.setupwizardlib.R;
     29 
     30 /**
     31  * An adapter used with RecyclerView to display an {@link ItemHierarchy}. The item hierarchy used to
     32  * create this adapter can be inflated by {@link com.android.setupwizardlib.items.ItemInflater} from
     33  * XML.
     34  */
     35 public class RecyclerItemAdapter extends RecyclerView.Adapter<ItemViewHolder>
     36         implements ItemHierarchy.Observer {
     37 
     38     private static final String TAG = "RecyclerItemAdapter";
     39 
     40     public interface OnItemSelectedListener {
     41         void onItemSelected(IItem item);
     42     }
     43 
     44     private final ItemHierarchy mItemHierarchy;
     45     private OnItemSelectedListener mListener;
     46 
     47     public RecyclerItemAdapter(ItemHierarchy hierarchy) {
     48         mItemHierarchy = hierarchy;
     49         mItemHierarchy.registerObserver(this);
     50     }
     51 
     52     public IItem getItem(int position) {
     53         return mItemHierarchy.getItemAt(position);
     54     }
     55 
     56     @Override
     57     public long getItemId(int position) {
     58         IItem mItem = getItem(position);
     59         if (mItem instanceof AbstractItem) {
     60             final int id = ((AbstractItem) mItem).getId();
     61             return id > 0 ? id : RecyclerView.NO_ID;
     62         } else {
     63             return RecyclerView.NO_ID;
     64         }
     65     }
     66 
     67     @Override
     68     public int getItemCount() {
     69         return mItemHierarchy.getCount();
     70     }
     71 
     72     @Override
     73     public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
     74         final LayoutInflater inflater = LayoutInflater.from(parent.getContext());
     75         final View view = inflater.inflate(viewType, parent, false);
     76         final ItemViewHolder viewHolder = new ItemViewHolder(view);
     77 
     78         final TypedArray typedArray = parent.getContext()
     79                 .obtainStyledAttributes(R.styleable.SuwRecyclerItemAdapter);
     80         Drawable selectableItemBackground = typedArray.getDrawable(
     81                 R.styleable.SuwRecyclerItemAdapter_android_selectableItemBackground);
     82         if (selectableItemBackground == null) {
     83             selectableItemBackground = typedArray.getDrawable(
     84                     R.styleable.SuwRecyclerItemAdapter_selectableItemBackground);
     85         }
     86 
     87         final Drawable background = typedArray.getDrawable(
     88                 R.styleable.SuwRecyclerItemAdapter_android_colorBackground);
     89 
     90         if (selectableItemBackground == null || background == null) {
     91             Log.e(TAG, "Cannot resolve required attributes."
     92                     + " selectableItemBackground=" + selectableItemBackground
     93                     + " background=" + background);
     94         } else {
     95             final Drawable[] layers = { background, selectableItemBackground };
     96             view.setBackgroundDrawable(new LayerDrawable(layers));
     97         }
     98 
     99         typedArray.recycle();
    100 
    101         view.setOnClickListener(new View.OnClickListener() {
    102             @Override
    103             public void onClick(View view) {
    104                 final IItem item = viewHolder.getItem();
    105                 if (mListener != null && item != null && item.isEnabled()) {
    106                     mListener.onItemSelected(item);
    107                 }
    108             }
    109         });
    110 
    111         return viewHolder;
    112     }
    113 
    114     @Override
    115     public void onBindViewHolder(ItemViewHolder holder, int position) {
    116         final IItem item = getItem(position);
    117         item.onBindView(holder.itemView);
    118         holder.setEnabled(item.isEnabled());
    119         holder.setItem(item);
    120     }
    121 
    122     @Override
    123     public int getItemViewType(int position) {
    124         // Use layout resource as item view type. RecyclerView item type does not have to be
    125         // contiguous.
    126         IItem item = getItem(position);
    127         return item.getLayoutResource();
    128     }
    129 
    130     @Override
    131     public void onChanged(ItemHierarchy hierarchy) {
    132         notifyDataSetChanged();
    133     }
    134 
    135     public ItemHierarchy findItemById(int id) {
    136         return mItemHierarchy.findItemById(id);
    137     }
    138 
    139     public ItemHierarchy getRootItemHierarchy() {
    140         return mItemHierarchy;
    141     }
    142 
    143     public void setOnItemSelectedListener(OnItemSelectedListener listener) {
    144         mListener = listener;
    145     }
    146 }
    147