X-Git-Url: http://git.linex4red.de/pub/Android/ownCloud.git/blobdiff_plain/2e5b40e357a5ab18b3a04f823b7cd27d5c94dc90..2946d8dd69cf8d30a3fc2447ac931675989e8eff:/src/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.java

diff --git a/src/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.java b/src/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.java
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+++ b/src/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.java
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+/* ownCloud Android client application
+ *   Copyright (C) 2012-2013  ownCloud Inc.
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License version 2,
+ *   as published by the Free Software Foundation.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+package com.owncloud.android.ui.preview;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+import java.util.Vector;
+
+import android.accounts.Account;
+import android.support.v4.app.Fragment;
+import android.support.v4.app.FragmentManager;
+import android.support.v4.app.FragmentStatePagerAdapter;
+import android.view.ViewGroup;
+
+import com.owncloud.android.datamodel.DataStorageManager;
+import com.owncloud.android.datamodel.OCFile;
+import com.owncloud.android.ui.fragment.FileFragment;
+
+/**
+ * Adapter class that provides Fragment instances  
+ * 
+ * @author David A. Velasco
+ */
+//public class PreviewImagePagerAdapter extends PagerAdapter {
+public class PreviewImagePagerAdapter extends FragmentStatePagerAdapter {
+    
+    private static final String TAG = PreviewImagePagerAdapter.class.getSimpleName();
+            
+    private Vector<OCFile> mImageFiles;
+    private Account mAccount;
+    private Set<Object> mObsoleteFragments;
+    private Set<Integer> mObsoletePositions;
+    private Set<Integer> mDownloadErrors;
+    private DataStorageManager mStorageManager;
+    
+    private Map<Integer, FileFragment> mCachedFragments;
+
+    /*
+    private final FragmentManager mFragmentManager;
+    private FragmentTransaction mCurTransaction = null;
+    private ArrayList<Fragment.SavedState> mSavedState = new ArrayList<Fragment.SavedState>();
+    private ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
+    private Fragment mCurrentPrimaryItem = null;
+    */
+
+    /**
+     * Constructor.
+     * 
+     * @param fragmentManager   {@link FragmentManager} instance that will handle the {@link Fragment}s provided by the adapter. 
+     * @param parentFolder      Folder where images will be searched for.
+     * @param storageManager    Bridge to database.
+     */
+    public PreviewImagePagerAdapter(FragmentManager fragmentManager, OCFile parentFolder, Account account, DataStorageManager storageManager) {
+        super(fragmentManager);
+        
+        if (fragmentManager == null) {
+            throw new IllegalArgumentException("NULL FragmentManager instance");
+        }
+        if (parentFolder == null) {
+            throw new IllegalArgumentException("NULL parent folder");
+        } 
+        if (storageManager == null) {
+            throw new IllegalArgumentException("NULL storage manager");
+        }
+
+        mAccount = account;
+        mStorageManager = storageManager;
+        mImageFiles = mStorageManager.getDirectoryImages(parentFolder); 
+        mObsoleteFragments = new HashSet<Object>();
+        mObsoletePositions = new HashSet<Integer>();
+        mDownloadErrors = new HashSet<Integer>();
+        //mFragmentManager = fragmentManager;
+        mCachedFragments = new HashMap<Integer, FileFragment>();
+    }
+
+    
+    /**
+     * Returns the image files handled by the adapter.
+     * 
+     * @return  A vector with the image files handled by the adapter.
+     */
+    protected OCFile getFileAt(int position) {
+        return mImageFiles.get(position);
+    }
+
+    
+    public Fragment getItem(int i) {
+        OCFile file = mImageFiles.get(i);
+        Fragment fragment = null;
+        if (file.isDown()) {
+            fragment = new PreviewImageFragment(file, mAccount, mObsoletePositions.contains(Integer.valueOf(i)));
+            
+        } else if (mDownloadErrors.contains(Integer.valueOf(i))) {
+            fragment = new FileDownloadFragment(file, mAccount, true);
+            ((FileDownloadFragment)fragment).setError(true);
+            mDownloadErrors.remove(Integer.valueOf(i));
+            
+        } else {
+            fragment = new FileDownloadFragment(file, mAccount, mObsoletePositions.contains(Integer.valueOf(i)));
+        }
+        mObsoletePositions.remove(Integer.valueOf(i));
+        return fragment;
+    }
+
+    public int getFilePosition(OCFile file) {
+        return mImageFiles.indexOf(file);
+    }
+    
+    @Override
+    public int getCount() {
+        return mImageFiles.size();
+    }
+
+    @Override
+    public CharSequence getPageTitle(int position) {
+        return mImageFiles.get(position).getFileName();
+    }
+
+    
+    public void updateFile(int position, OCFile file) {
+        FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
+        if (fragmentToUpdate != null) {
+            mObsoleteFragments.add(fragmentToUpdate);
+        }
+        mObsoletePositions.add(Integer.valueOf(position));
+        mImageFiles.set(position, file);
+    }
+    
+    
+    public void updateWithDownloadError(int position) {
+        FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
+        if (fragmentToUpdate != null) {
+            mObsoleteFragments.add(fragmentToUpdate);
+        }
+        mDownloadErrors.add(Integer.valueOf(position));
+    }
+    
+    public void clearErrorAt(int position) {
+        FileFragment fragmentToUpdate = mCachedFragments.get(Integer.valueOf(position));
+        if (fragmentToUpdate != null) {
+            mObsoleteFragments.add(fragmentToUpdate);
+        }
+        mDownloadErrors.remove(Integer.valueOf(position));
+    }
+    
+    
+    @Override
+    public int getItemPosition(Object object) {
+        if (mObsoleteFragments.contains(object)) {
+            mObsoleteFragments.remove(object);
+            return POSITION_NONE;
+        }
+        return super.getItemPosition(object);
+    }
+
+
+    @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        Object fragment = super.instantiateItem(container, position);
+        mCachedFragments.put(Integer.valueOf(position), (FileFragment)fragment);
+        return fragment;
+    }
+    
+    @Override
+    public void destroyItem(ViewGroup container, int position, Object object) {
+       mCachedFragments.remove(Integer.valueOf(position));
+       super.destroyItem(container, position, object);
+    }
+
+
+    public boolean pendingErrorAt(int position) {
+        return mDownloadErrors.contains(Integer.valueOf(position));
+    }
+
+
+    
+    /* -*
+     * Called when a change in the shown pages is going to start being made.
+     * 
+     * @param   container   The containing View which is displaying this adapter's page views.
+     *- /
+    @Override
+    public void startUpdate(ViewGroup container) {
+        Log.e(TAG, "** startUpdate");
+    }
+
+    @Override
+    public Object instantiateItem(ViewGroup container, int position) {
+        Log.e(TAG, "** instantiateItem " + position);
+        
+        if (mFragments.size() > position) {
+            Fragment fragment = mFragments.get(position);
+            if (fragment != null) {
+                Log.e(TAG, "** \t returning cached item");
+                return fragment;
+            }
+        }
+
+        if (mCurTransaction == null) {
+            mCurTransaction = mFragmentManager.beginTransaction();
+        }
+
+        Fragment fragment = getItem(position);
+        if (mSavedState.size() > position) {
+            Fragment.SavedState savedState = mSavedState.get(position);
+            if (savedState != null) {
+                // TODO WATCH OUT:
+                // * The Fragment must currently be attached to the FragmentManager.
+                // * A new Fragment created using this saved state must be the same class type as the Fragment it was created from.
+                // * The saved state can not contain dependencies on other fragments -- that is it can't use putFragment(Bundle, String, Fragment) 
+                //   to store a fragment reference                 
+                fragment.setInitialSavedState(savedState);
+            }
+        }
+        while (mFragments.size() <= position) {
+            mFragments.add(null);
+        }
+        fragment.setMenuVisibility(false);
+        mFragments.set(position, fragment);
+        //Log.e(TAG, "** \t adding fragment at position " + position + ", containerId " + container.getId());
+        mCurTransaction.add(container.getId(), fragment);
+
+        return fragment;
+    }
+
+    @Override
+    public void destroyItem(ViewGroup container, int position, Object object) {
+        Log.e(TAG, "** destroyItem " + position);
+        Fragment fragment = (Fragment)object;
+        
+        if (mCurTransaction == null) {
+            mCurTransaction = mFragmentManager.beginTransaction();
+        }
+        Log.e(TAG, "** \t removing fragment at position " + position);
+        while (mSavedState.size() <= position) {
+            mSavedState.add(null);
+        }
+        mSavedState.set(position, mFragmentManager.saveFragmentInstanceState(fragment));
+        mFragments.set(position, null);
+
+        mCurTransaction.remove(fragment);
+    }
+
+    @Override
+    public void setPrimaryItem(ViewGroup container, int position, Object object) {
+        Fragment fragment = (Fragment)object;
+        if (fragment != mCurrentPrimaryItem) {
+            if (mCurrentPrimaryItem != null) {
+                mCurrentPrimaryItem.setMenuVisibility(false);
+            }
+            if (fragment != null) {
+                fragment.setMenuVisibility(true);
+            }
+            mCurrentPrimaryItem = fragment;
+        }
+    }
+
+    @Override
+    public void finishUpdate(ViewGroup container) {
+        Log.e(TAG, "** finishUpdate (start)");
+        if (mCurTransaction != null) {
+            mCurTransaction.commitAllowingStateLoss();
+            mCurTransaction = null;
+            mFragmentManager.executePendingTransactions();
+        }
+        Log.e(TAG, "** finishUpdate (end)");
+    }
+
+    @Override
+    public boolean isViewFromObject(View view, Object object) {
+        return ((Fragment)object).getView() == view;
+    }
+
+    @Override
+    public Parcelable saveState() {
+        Bundle state = null;
+        if (mSavedState.size() > 0) {
+            state = new Bundle();
+            Fragment.SavedState[] savedStates = new Fragment.SavedState[mSavedState.size()];
+            mSavedState.toArray(savedStates);
+            state.putParcelableArray("states", savedStates);
+        }
+        for (int i=0; i<mFragments.size(); i++) {
+            Fragment fragment = mFragments.get(i);
+            if (fragment != null) {
+                if (state == null) {
+                    state = new Bundle();
+                }
+                String key = "f" + i;
+                mFragmentManager.putFragment(state, key, fragment);
+            }
+        }
+        return state;
+    }
+
+    @Override
+    public void restoreState(Parcelable state, ClassLoader loader) {
+        if (state != null) {
+            Bundle bundle = (Bundle)state;
+            bundle.setClassLoader(loader);
+            Parcelable[] states = bundle.getParcelableArray("states");
+            mSavedState.clear();
+            mFragments.clear();
+            if (states != null) {
+                for (int i=0; i<states.length; i++) {
+                    mSavedState.add((Fragment.SavedState)states[i]);
+                }
+            }
+            Iterable<String> keys = bundle.keySet();
+            for (String key: keys) {
+                if (key.startsWith("f")) {
+                    int index = Integer.parseInt(key.substring(1));
+                    Fragment f = mFragmentManager.getFragment(bundle, key);
+                    if (f != null) {
+                        while (mFragments.size() <= index) {
+                            mFragments.add(null);
+                        }
+                        f.setMenuVisibility(false);
+                        mFragments.set(index, f);
+                    } else {
+                        Log.w(TAG, "Bad fragment at key " + key);
+                    }
+                }
+            }
+        }
+    }
+    */
+}