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      1 /*
      2  * Copyright (C) 2013 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.gallery3d.ingest.adapter;
     18 
     19 import com.android.gallery3d.R;
     20 import com.android.gallery3d.ingest.data.IngestObjectInfo;
     21 import com.android.gallery3d.ingest.data.MtpDeviceIndex;
     22 import com.android.gallery3d.ingest.data.MtpDeviceIndex.SortOrder;
     23 import com.android.gallery3d.ingest.ui.MtpFullscreenView;
     24 
     25 import android.annotation.TargetApi;
     26 import android.content.Context;
     27 import android.os.Build;
     28 import androidx.viewpager.widget.PagerAdapter;
     29 import android.view.LayoutInflater;
     30 import android.view.View;
     31 import android.view.ViewGroup;
     32 
     33 /**
     34  * Adapter for full-screen MTP pager.
     35  */
     36 @TargetApi(Build.VERSION_CODES.HONEYCOMB_MR1)
     37 public class MtpPagerAdapter extends PagerAdapter {
     38 
     39   private LayoutInflater mInflater;
     40   private int mGeneration = 0;
     41   private CheckBroker mBroker;
     42   private MtpDeviceIndex mModel;
     43   private SortOrder mSortOrder = SortOrder.DESCENDING;
     44 
     45   private MtpFullscreenView mReusableView = null;
     46 
     47   public MtpPagerAdapter(Context context, CheckBroker broker) {
     48     super();
     49     mInflater = LayoutInflater.from(context);
     50     mBroker = broker;
     51   }
     52 
     53   public void setMtpDeviceIndex(MtpDeviceIndex index) {
     54     mModel = index;
     55     notifyDataSetChanged();
     56   }
     57 
     58   @Override
     59   public int getCount() {
     60     return mModel != null ? mModel.sizeWithoutLabels() : 0;
     61   }
     62 
     63   @Override
     64   public void notifyDataSetChanged() {
     65     mGeneration++;
     66     super.notifyDataSetChanged();
     67   }
     68 
     69   public int translatePositionWithLabels(int position) {
     70     if (mModel == null) {
     71       return -1;
     72     }
     73     return mModel.getPositionWithoutLabelsFromPosition(position, mSortOrder);
     74   }
     75 
     76   @Override
     77   public void finishUpdate(ViewGroup container) {
     78     mReusableView = null;
     79     super.finishUpdate(container);
     80   }
     81 
     82   @Override
     83   public boolean isViewFromObject(View view, Object object) {
     84     return view == object;
     85   }
     86 
     87   @Override
     88   public void destroyItem(ViewGroup container, int position, Object object) {
     89     MtpFullscreenView v = (MtpFullscreenView) object;
     90     container.removeView(v);
     91     mBroker.unregisterOnCheckedChangeListener(v);
     92     mReusableView = v;
     93   }
     94 
     95   @Override
     96   public Object instantiateItem(ViewGroup container, int position) {
     97     MtpFullscreenView v;
     98     if (mReusableView != null) {
     99       v = mReusableView;
    100       mReusableView = null;
    101     } else {
    102       v = (MtpFullscreenView) mInflater.inflate(R.layout.ingest_fullsize, container, false);
    103     }
    104     IngestObjectInfo i = mModel.getWithoutLabels(position, mSortOrder);
    105     v.getImageView().setMtpDeviceAndObjectInfo(mModel.getDevice(), i, mGeneration);
    106     v.setPositionAndBroker(position, mBroker);
    107     container.addView(v);
    108     return v;
    109   }
    110 }
    111