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) {
  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);
  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 = new PreviewImageFragment(file, mAccount, mObsoletePositions.contains(Integer.valueOf(i)));
 106
 107         } else if (mDownloadErrors.contains(Integer.valueOf(i))) {
 108             fragment = new FileDownloadFragment(file, mAccount, true);
 109             ((FileDownloadFragment)fragment).setError(true);
 110             mDownloadErrors.remove(Integer.valueOf(i));
 111
 112         } else {
 113             fragment = new FileDownloadFragment(file, mAccount, mObsoletePositions.contains(Integer.valueOf(i)));
 114         }
 115         mObsoletePositions.remove(Integer.valueOf(i));
 116         return fragment;
 117     }
 118
 119     public int getFilePosition(OCFile file) {
 120         return mImageFiles.indexOf(file);
 121     }
 122
 123     @Override
 124     public int getCount() {
 125         return mImageFiles.size();
 126     }
 127
 128     @Override
 129     public CharSequence getPageTitle(int position) {
 130         return mImageFiles.get(position).getFileName();
 131     }
 132
 133
 134     public void updateFile(int position, OCFile file) {
 135         FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
 136         if (fragmentToUpdate != null) {
 137             mObsoleteFragments.add(fragmentToUpdate);
 138         }
 139         mObsoletePositions.add(Integer.valueOf(position));
 140         mImageFiles.set(position, file);
 141     }
 142
 143
 144     public void updateWithDownloadError(int position) {
 145         FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
 146         if (fragmentToUpdate != null) {
 147             mObsoleteFragments.add(fragmentToUpdate);
 148         }
 149         mDownloadErrors.add(Integer.valueOf(position));
 150     }
 151
 152     public void clearErrorAt(int position) {
 153         FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
 154         if (fragmentToUpdate != null) {
 155             mObsoleteFragments.add(fragmentToUpdate);
 156         }
 157         mDownloadErrors.remove(Integer.valueOf(position));
 158     }
 159
 160
 161     @Override
 162     public int getItemPosition(Object object) {
 163         if (mObsoleteFragments.contains(object)) {
 164             mObsoleteFragments.remove(object);
 165             return POSITION_NONE;
 166         }
 167         return super.getItemPosition(object);
 168     }
 169
 170
 171     @Override
 172     public Object instantiateItem(ViewGroup container, int position) {
 173         Object fragment = super.instantiateItem(container, position);
 174         mCachedFragments.put(Integer.valueOf(position), (FileFragment)fragment);
 175         return fragment;
 176     }
 177
 178     @Override
 179     public void destroyItem(ViewGroup container, int position, Object object) {
 180        mCachedFragments.remove(Integer.valueOf(position));
 181        super.destroyItem(container, position, object);
 182     }
 183
 184
 185     public boolean pendingErrorAt(int position) {
 186         return mDownloadErrors.contains(Integer.valueOf(position));
 187     }
 188
 189     /**
 190      * Reset the image zoom to default value for each CachedFragments
 191      */
 192     public void resetZoom() {
 193         Iterator<FileFragment> entries = mCachedFragments.values().iterator();
 194         while (entries.hasNext()) {
 195         FileFragment fileFragment = (FileFragment) entries.next();
 196             if (fileFragment instanceof PreviewImageFragment) {
 197                 ((PreviewImageFragment) fileFragment).getImageView().resetZoom();
 198             }
 199         }
 200     }
 201
 202     /* -*
 203      * Called when a change in the shown pages is going to start being made.
 204      *
 205      * @param   container   The containing View which is displaying this adapter's page views.
 206      *- /
 207     @Override
 208     public void startUpdate(ViewGroup container) {
 209         Log_OC.e(TAG, "** startUpdate");
 210     }
 211
 212     @Override
 213     public Object instantiateItem(ViewGroup container, int position) {
 214         Log_OC.e(TAG, "** instantiateItem " + position);
 215
 216         if (mFragments.size() > position) {
 217             Fragment fragment = mFragments.get(position);
 218             if (fragment != null) {
 219                 Log_OC.e(TAG, "** \t returning cached item");
 220                 return fragment;
 221             }
 222         }
 223
 224         if (mCurTransaction == null) {
 225             mCurTransaction = mFragmentManager.beginTransaction();
 226         }
 227
 228         Fragment fragment = getItem(position);
 229         if (mSavedState.size() > position) {
 230             Fragment.SavedState savedState = mSavedState.get(position);
 231             if (savedState != null) {
 232                 // TODO WATCH OUT:
 233                 // * The Fragment must currently be attached to the FragmentManager.
 234                 // * A new Fragment created using this saved state must be the same class type as the Fragment it was created from.
 235                 // * The saved state can not contain dependencies on other fragments -- that is it can't use putFragment(Bundle, String, Fragment)
 236                 //   to store a fragment reference
 237                 fragment.setInitialSavedState(savedState);
 238             }
 239         }
 240         while (mFragments.size() <= position) {
 241             mFragments.add(null);
 242         }
 243         fragment.setMenuVisibility(false);
 244         mFragments.set(position, fragment);
 245         //Log_OC.e(TAG, "** \t adding fragment at position " + position + ", containerId " + container.getId());
 246         mCurTransaction.add(container.getId(), fragment);
 247
 248         return fragment;
 249     }
 250
 251     @Override
 252     public void destroyItem(ViewGroup container, int position, Object object) {
 253         Log_OC.e(TAG, "** destroyItem " + position);
 254         Fragment fragment = (Fragment)object;
 255
 256         if (mCurTransaction == null) {
 257             mCurTransaction = mFragmentManager.beginTransaction();
 258         }
 259         Log_OC.e(TAG, "** \t removing fragment at position " + position);
 260         while (mSavedState.size() <= position) {
 261             mSavedState.add(null);
 262         }
 263         mSavedState.set(position, mFragmentManager.saveFragmentInstanceState(fragment));
 264         mFragments.set(position, null);
 265
 266         mCurTransaction.remove(fragment);
 267     }
 268
 269     @Override
 270     public void setPrimaryItem(ViewGroup container, int position, Object object) {
 271         Fragment fragment = (Fragment)object;
 272         if (fragment != mCurrentPrimaryItem) {
 273             if (mCurrentPrimaryItem != null) {
 274                 mCurrentPrimaryItem.setMenuVisibility(false);
 275             }
 276             if (fragment != null) {
 277                 fragment.setMenuVisibility(true);
 278             }
 279             mCurrentPrimaryItem = fragment;
 280         }
 281     }
 282
 283     @Override
 284     public void finishUpdate(ViewGroup container) {
 285         Log_OC.e(TAG, "** finishUpdate (start)");
 286         if (mCurTransaction != null) {
 287             mCurTransaction.commitAllowingStateLoss();
 288             mCurTransaction = null;
 289             mFragmentManager.executePendingTransactions();
 290         }
 291         Log_OC.e(TAG, "** finishUpdate (end)");
 292     }
 293
 294     @Override
 295     public boolean isViewFromObject(View view, Object object) {
 296         return ((Fragment)object).getView() == view;
 297     }
 298
 299     @Override
 300     public Parcelable saveState() {
 301         Bundle state = null;
 302         if (mSavedState.size() > 0) {
 303             state = new Bundle();
 304             Fragment.SavedState[] savedStates = new Fragment.SavedState[mSavedState.size()];
 305             mSavedState.toArray(savedStates);
 306             state.putParcelableArray("states", savedStates);
 307         }
 308         for (int i=0; i<mFragments.size(); i++) {
 309             Fragment fragment = mFragments.get(i);
 310             if (fragment != null) {
 311                 if (state == null) {
 312                     state = new Bundle();
 313                 }
 314                 String key = "f" + i;
 315                 mFragmentManager.putFragment(state, key, fragment);
 316             }
 317         }
 318         return state;
 319     }
 320
 321     @Override
 322     public void restoreState(Parcelable state, ClassLoader loader) {
 323         if (state != null) {
 324             Bundle bundle = (Bundle)state;
 325             bundle.setClassLoader(loader);
 326             Parcelable[] states = bundle.getParcelableArray("states");
 327             mSavedState.clear();
 328             mFragments.clear();
 329             if (states != null) {
 330                 for (int i=0; i<states.length; i++) {
 331                     mSavedState.add((Fragment.SavedState)states[i]);
 332                 }
 333             }
 334             Iterable<String> keys = bundle.keySet();
 335             for (String key: keys) {
 336                 if (key.startsWith("f")) {
 337                     int index = Integer.parseInt(key.substring(1));
 338                     Fragment f = mFragmentManager.getFragment(bundle, key);
 339                     if (f != null) {
 340                         while (mFragments.size() <= index) {
 341                             mFragments.add(null);
 342                         }
 343                         f.setMenuVisibility(false);
 344                         mFragments.set(index, f);
 345                     } else {
 346                         Log_OC.w(TAG, "Bad fragment at key " + key);
 347                     }
 348                 }
 349             }
 350         }
 351     }
 352     */
 353 }