src/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.java

   1 /**
   2  *   ownCloud Android client application
   3  *
   4  *   @author David A. Velasco
   5  *   Copyright (C) 2015  ownCloud Inc.
   6  *
   7  *   This program is free software: you can redistribute it and/or modify
   8  *   it under the terms of the GNU General Public License version 2,
   9  *   as published by the Free Software Foundation.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  *
  19  */
  20 package com.owncloud.android.ui.preview;
  21
  22 import java.util.Collections;
  23 import java.util.Comparator;
  24 import java.util.HashMap;
  25 import java.util.HashSet;
  26 import java.util.Iterator;
  27 import java.util.Map;
  28 import java.util.Set;
  29 import java.util.Vector;
  30
  31 import android.accounts.Account;
  32 import android.support.v4.app.Fragment;
  33 import android.support.v4.app.FragmentManager;
  34 import android.support.v4.app.FragmentStatePagerAdapter;
  35 import android.view.ViewGroup;
  36
  37 import com.owncloud.android.datamodel.FileDataStorageManager;
  38 import com.owncloud.android.datamodel.OCFile;
  39 import com.owncloud.android.ui.adapter.FileListListAdapter;
  40 import com.owncloud.android.ui.fragment.FileFragment;
  41 import com.owncloud.android.utils.FileStorageUtils;
  42
  43 /**
  44  * Adapter class that provides Fragment instances
  45  */
  46 //public class PreviewImagePagerAdapter extends PagerAdapter {
  47 public class PreviewImagePagerAdapter extends FragmentStatePagerAdapter {
  48
  49     private Vector<OCFile> mImageFiles;
  50     private Account mAccount;
  51     private Set<Object> mObsoleteFragments;
  52     private Set<Integer> mObsoletePositions;
  53     private Set<Integer> mDownloadErrors;
  54     private FileDataStorageManager mStorageManager;
  55
  56     private Map<Integer, FileFragment> mCachedFragments;
  57
  58     /**
  59      * Constructor.
  60      *
  61      * @param fragmentManager   {@link FragmentManager} instance that will handle the {@link Fragment}s provided by the adapter.
  62      * @param parentFolder      Folder where images will be searched for.
  63      * @param storageManager    Bridge to database.
  64      */
  65     public PreviewImagePagerAdapter(FragmentManager fragmentManager, OCFile parentFolder, Account account, FileDataStorageManager storageManager, boolean onlyOnDevice) {
  66         super(fragmentManager);
  67
  68         if (fragmentManager == null) {
  69             throw new IllegalArgumentException("NULL FragmentManager instance");
  70         }
  71         if (parentFolder == null) {
  72             throw new IllegalArgumentException("NULL parent folder");
  73         }
  74         if (storageManager == null) {
  75             throw new IllegalArgumentException("NULL storage manager");
  76         }
  77
  78         mAccount = account;
  79         mStorageManager = storageManager;
  80         mImageFiles = mStorageManager.getFolderImages(parentFolder, false);
  81
  82         mImageFiles = FileStorageUtils.sortFolder(mImageFiles);
  83
  84         mObsoleteFragments = new HashSet<Object>();
  85         mObsoletePositions = new HashSet<Integer>();
  86         mDownloadErrors = new HashSet<Integer>();
  87         //mFragmentManager = fragmentManager;
  88         mCachedFragments = new HashMap<Integer, FileFragment>();
  89     }
  90
  91     /**
  92      * Returns the image files handled by the adapter.
  93      *
  94      * @return  A vector with the image files handled by the adapter.
  95      */
  96     protected OCFile getFileAt(int position) {
  97         return mImageFiles.get(position);
  98     }
  99
 100
 101     public Fragment getItem(int i) {
 102         OCFile file = mImageFiles.get(i);
 103         Fragment fragment = null;
 104         if (file.isDown()) {
 105             fragment = PreviewImageFragment.newInstance(file, mObsoletePositions.contains(Integer.valueOf(i)));
 106
 107         } else if (mDownloadErrors.contains(Integer.valueOf(i))) {
 108             fragment = FileDownloadFragment.newInstance(file, mAccount, true);
 109             ((FileDownloadFragment)fragment).setError(true);
 110             mDownloadErrors.remove(Integer.valueOf(i));
 111
 112         } else {
 113             fragment = FileDownloadFragment.newInstance(
 114                     file, mAccount, mObsoletePositions.contains(Integer.valueOf(i))
 115             );
 116         }
 117         mObsoletePositions.remove(Integer.valueOf(i));
 118         return fragment;
 119     }
 120
 121     public int getFilePosition(OCFile file) {
 122         return mImageFiles.indexOf(file);
 123     }
 124
 125     @Override
 126     public int getCount() {
 127         return mImageFiles.size();
 128     }
 129
 130     @Override
 131     public CharSequence getPageTitle(int position) {
 132         return mImageFiles.get(position).getFileName();
 133     }
 134
 135
 136     public void updateFile(int position, OCFile file) {
 137         FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
 138         if (fragmentToUpdate != null) {
 139             mObsoleteFragments.add(fragmentToUpdate);
 140         }
 141         mObsoletePositions.add(Integer.valueOf(position));
 142         mImageFiles.set(position, file);
 143     }
 144
 145
 146     public void updateWithDownloadError(int position) {
 147         FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
 148         if (fragmentToUpdate != null) {
 149             mObsoleteFragments.add(fragmentToUpdate);
 150         }
 151         mDownloadErrors.add(Integer.valueOf(position));
 152     }
 153
 154     public void clearErrorAt(int position) {
 155         FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
 156         if (fragmentToUpdate != null) {
 157             mObsoleteFragments.add(fragmentToUpdate);
 158         }
 159         mDownloadErrors.remove(Integer.valueOf(position));
 160     }
 161
 162
 163     @Override
 164     public int getItemPosition(Object object) {
 165         if (mObsoleteFragments.contains(object)) {
 166             mObsoleteFragments.remove(object);
 167             return POSITION_NONE;
 168         }
 169         return super.getItemPosition(object);
 170     }
 171
 172
 173     @Override
 174     public Object instantiateItem(ViewGroup container, int position) {
 175         Object fragment = super.instantiateItem(container, position);
 176         mCachedFragments.put(Integer.valueOf(position), (FileFragment)fragment);
 177         return fragment;
 178     }
 179
 180     @Override
 181     public void destroyItem(ViewGroup container, int position, Object object) {
 182        mCachedFragments.remove(Integer.valueOf(position));
 183        super.destroyItem(container, position, object);
 184     }
 185
 186
 187     public boolean pendingErrorAt(int position) {
 188         return mDownloadErrors.contains(Integer.valueOf(position));
 189     }
 190
 191     /**
 192      * Reset the image zoom to default value for each CachedFragments
 193      */
 194     public void resetZoom() {
 195         Iterator<FileFragment> entries = mCachedFragments.values().iterator();
 196         while (entries.hasNext()) {
 197         FileFragment fileFragment = (FileFragment) entries.next();
 198             if (fileFragment instanceof PreviewImageFragment) {
 199                 ((PreviewImageFragment) fileFragment).getImageView().resetZoom();
 200             }
 201         }
 202     }
 203
 204     /* -*
 205      * Called when a change in the shown pages is going to start being made.
 206      *
 207      * @param   container   The containing View which is displaying this adapter's page views.
 208      *- /
 209     @Override
 210     public void startUpdate(ViewGroup container) {
 211         Log_OC.e(TAG, "** startUpdate");
 212     }
 213
 214     @Override
 215     public Object instantiateItem(ViewGroup container, int position) {
 216         Log_OC.e(TAG, "** instantiateItem " + position);
 217
 218         if (mFragments.size() > position) {
 219             Fragment fragment = mFragments.get(position);
 220             if (fragment != null) {
 221                 Log_OC.e(TAG, "** \t returning cached item");
 222                 return fragment;
 223             }
 224         }
 225
 226         if (mCurTransaction == null) {
 227             mCurTransaction = mFragmentManager.beginTransaction();
 228         }
 229
 230         Fragment fragment = getItem(position);
 231         if (mSavedState.size() > position) {
 232             Fragment.SavedState savedState = mSavedState.get(position);
 233             if (savedState != null) {
 234                 // TODO WATCH OUT:
 235                 // * The Fragment must currently be attached to the FragmentManager.
 236                 // * A new Fragment created using this saved state must be the same class type as the Fragment it was created from.
 237                 // * The saved state can not contain dependencies on other fragments -- that is it can't use putFragment(Bundle, String, Fragment)
 238                 //   to store a fragment reference
 239                 fragment.setInitialSavedState(savedState);
 240             }
 241         }
 242         while (mFragments.size() <= position) {
 243             mFragments.add(null);
 244         }
 245         fragment.setMenuVisibility(false);
 246         mFragments.set(position, fragment);
 247         //Log_OC.e(TAG, "** \t adding fragment at position " + position + ", containerId " + container.getId());
 248         mCurTransaction.add(container.getId(), fragment);
 249
 250         return fragment;
 251     }
 252
 253     @Override
 254     public void destroyItem(ViewGroup container, int position, Object object) {
 255         Log_OC.e(TAG, "** destroyItem " + position);
 256         Fragment fragment = (Fragment)object;
 257
 258         if (mCurTransaction == null) {
 259             mCurTransaction = mFragmentManager.beginTransaction();
 260         }
 261         Log_OC.e(TAG, "** \t removing fragment at position " + position);
 262         while (mSavedState.size() <= position) {
 263             mSavedState.add(null);
 264         }
 265         mSavedState.set(position, mFragmentManager.saveFragmentInstanceState(fragment));
 266         mFragments.set(position, null);
 267
 268         mCurTransaction.remove(fragment);
 269     }
 270
 271     @Override
 272     public void setPrimaryItem(ViewGroup container, int position, Object object) {
 273         Fragment fragment = (Fragment)object;
 274         if (fragment != mCurrentPrimaryItem) {
 275             if (mCurrentPrimaryItem != null) {
 276                 mCurrentPrimaryItem.setMenuVisibility(false);
 277             }
 278             if (fragment != null) {
 279                 fragment.setMenuVisibility(true);
 280             }
 281             mCurrentPrimaryItem = fragment;
 282         }
 283     }
 284
 285     @Override
 286     public void finishUpdate(ViewGroup container) {
 287         Log_OC.e(TAG, "** finishUpdate (start)");
 288         if (mCurTransaction != null) {
 289             mCurTransaction.commitAllowingStateLoss();
 290             mCurTransaction = null;
 291             mFragmentManager.executePendingTransactions();
 292         }
 293         Log_OC.e(TAG, "** finishUpdate (end)");
 294     }
 295
 296     @Override
 297     public boolean isViewFromObject(View view, Object object) {
 298         return ((Fragment)object).getView() == view;
 299     }
 300
 301     @Override
 302     public Parcelable saveState() {
 303         Bundle state = null;
 304         if (mSavedState.size() > 0) {
 305             state = new Bundle();
 306             Fragment.SavedState[] savedStates = new Fragment.SavedState[mSavedState.size()];
 307             mSavedState.toArray(savedStates);
 308             state.putParcelableArray("states", savedStates);
 309         }
 310         for (int i=0; i<mFragments.size(); i++) {
 311             Fragment fragment = mFragments.get(i);
 312             if (fragment != null) {
 313                 if (state == null) {
 314                     state = new Bundle();
 315                 }
 316                 String key = "f" + i;
 317                 mFragmentManager.putFragment(state, key, fragment);
 318             }
 319         }
 320         return state;
 321     }
 322
 323     @Override
 324     public void restoreState(Parcelable state, ClassLoader loader) {
 325         if (state != null) {
 326             Bundle bundle = (Bundle)state;
 327             bundle.setClassLoader(loader);
 328             Parcelable[] states = bundle.getParcelableArray("states");
 329             mSavedState.clear();
 330             mFragments.clear();
 331             if (states != null) {
 332                 for (int i=0; i<states.length; i++) {
 333                     mSavedState.add((Fragment.SavedState)states[i]);
 334                 }
 335             }
 336             Iterable<String> keys = bundle.keySet();
 337             for (String key: keys) {
 338                 if (key.startsWith("f")) {
 339                     int index = Integer.parseInt(key.substring(1));
 340                     Fragment f = mFragmentManager.getFragment(bundle, key);
 341                     if (f != null) {
 342                         while (mFragments.size() <= index) {
 343                             mFragments.add(null);
 344                         }
 345                         f.setMenuVisibility(false);
 346                         mFragments.set(index, f);
 347                     } else {
 348                         Log_OC.w(TAG, "Bad fragment at key " + key);
 349                     }
 350                 }
 351             }
 352         }
 353     }
 354     */
 355 }