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
17package com.android.documentsui;
18
19import static com.android.documentsui.DocumentsActivity.TAG;
20
21import android.app.Fragment;
22import android.app.FragmentManager;
23import android.app.FragmentTransaction;
24import android.app.LoaderManager.LoaderCallbacks;
25import android.content.ContentResolver;
26import android.content.Context;
27import android.content.Loader;
28import android.database.Cursor;
29import android.graphics.drawable.Drawable;
30import android.net.Uri;
31import android.os.Bundle;
32import android.os.CancellationSignal;
33import android.text.Spannable;
34import android.text.SpannableStringBuilder;
35import android.text.TextUtils.TruncateAt;
36import android.text.style.ImageSpan;
37import android.util.Log;
38import android.view.LayoutInflater;
39import android.view.View;
40import android.view.ViewGroup;
41import android.widget.AdapterView;
42import android.widget.AdapterView.OnItemClickListener;
43import android.widget.BaseAdapter;
44import android.widget.ImageView;
45import android.widget.ListView;
46import android.widget.TextView;
47
48import com.android.documentsui.DocumentsActivity.State;
49import com.android.documentsui.RecentsProvider.RecentColumns;
50import com.android.documentsui.model.DocumentStack;
51import com.android.documentsui.model.DurableUtils;
52import com.android.documentsui.model.RootInfo;
53import com.google.android.collect.Lists;
54
55import libcore.io.IoUtils;
56
57import java.io.ByteArrayInputStream;
58import java.io.DataInputStream;
59import java.io.IOException;
60import java.util.ArrayList;
61import java.util.Collection;
62import java.util.List;
63
64/**
65 * Display directories where recent creates took place.
66 */
67public class RecentsCreateFragment extends Fragment {
68
69    private View mEmptyView;
70    private ListView mListView;
71
72    private DocumentStackAdapter mAdapter;
73    private LoaderCallbacks<List<DocumentStack>> mCallbacks;
74
75    private static final int LOADER_RECENTS = 3;
76
77    public static void show(FragmentManager fm) {
78        final RecentsCreateFragment fragment = new RecentsCreateFragment();
79        final FragmentTransaction ft = fm.beginTransaction();
80        ft.replace(R.id.container_directory, fragment);
81        ft.commitAllowingStateLoss();
82    }
83
84    @Override
85    public View onCreateView(
86            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
87        final Context context = inflater.getContext();
88
89        final View view = inflater.inflate(R.layout.fragment_directory, container, false);
90
91        mEmptyView = view.findViewById(android.R.id.empty);
92
93        mListView = (ListView) view.findViewById(R.id.list);
94        mListView.setOnItemClickListener(mItemListener);
95
96        mAdapter = new DocumentStackAdapter();
97        mListView.setAdapter(mAdapter);
98
99        final RootsCache roots = DocumentsApplication.getRootsCache(context);
100        final State state = ((DocumentsActivity) getActivity()).getDisplayState();
101
102        mCallbacks = new LoaderCallbacks<List<DocumentStack>>() {
103            @Override
104            public Loader<List<DocumentStack>> onCreateLoader(int id, Bundle args) {
105                return new RecentsCreateLoader(context, roots, state);
106            }
107
108            @Override
109            public void onLoadFinished(
110                    Loader<List<DocumentStack>> loader, List<DocumentStack> data) {
111                mAdapter.swapStacks(data);
112
113                // When launched into empty recents, show drawer
114                if (mAdapter.isEmpty() && !state.stackTouched) {
115                    ((DocumentsActivity) context).setRootsDrawerOpen(true);
116                }
117            }
118
119            @Override
120            public void onLoaderReset(Loader<List<DocumentStack>> loader) {
121                mAdapter.swapStacks(null);
122            }
123        };
124
125        return view;
126    }
127
128    @Override
129    public void onStart() {
130        super.onStart();
131        getLoaderManager().restartLoader(LOADER_RECENTS, getArguments(), mCallbacks);
132    }
133
134    @Override
135    public void onStop() {
136        super.onStop();
137        getLoaderManager().destroyLoader(LOADER_RECENTS);
138    }
139
140    private OnItemClickListener mItemListener = new OnItemClickListener() {
141        @Override
142        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
143            final DocumentStack stack = mAdapter.getItem(position);
144            ((DocumentsActivity) getActivity()).onStackPicked(stack);
145        }
146    };
147
148    public static class RecentsCreateLoader extends UriDerivativeLoader<Uri, List<DocumentStack>> {
149        private final RootsCache mRoots;
150        private final State mState;
151
152        public RecentsCreateLoader(Context context, RootsCache roots, State state) {
153            super(context, RecentsProvider.buildRecent());
154            mRoots = roots;
155            mState = state;
156        }
157
158        @Override
159        public List<DocumentStack> loadInBackground(Uri uri, CancellationSignal signal) {
160            final Collection<RootInfo> matchingRoots = mRoots.getMatchingRootsBlocking(mState);
161            final ArrayList<DocumentStack> result = Lists.newArrayList();
162
163            final ContentResolver resolver = getContext().getContentResolver();
164            final Cursor cursor = resolver.query(
165                    uri, null, null, null, RecentColumns.TIMESTAMP + " DESC", signal);
166            try {
167                while (cursor != null && cursor.moveToNext()) {
168                    final byte[] rawStack = cursor.getBlob(
169                            cursor.getColumnIndex(RecentColumns.STACK));
170                    try {
171                        final DocumentStack stack = new DocumentStack();
172                        DurableUtils.readFromArray(rawStack, stack);
173
174                        // Only update root here to avoid spinning up all
175                        // providers; we update the stack during the actual
176                        // restore. This also filters away roots that don't
177                        // match current filter.
178                        stack.updateRoot(matchingRoots);
179                        result.add(stack);
180                    } catch (IOException e) {
181                        Log.w(TAG, "Failed to resolve stack: " + e);
182                    }
183                }
184            } finally {
185                IoUtils.closeQuietly(cursor);
186            }
187
188            return result;
189        }
190    }
191
192    private class DocumentStackAdapter extends BaseAdapter {
193        private List<DocumentStack> mStacks;
194
195        public DocumentStackAdapter() {
196        }
197
198        public void swapStacks(List<DocumentStack> stacks) {
199            mStacks = stacks;
200
201            if (isEmpty()) {
202                mEmptyView.setVisibility(View.VISIBLE);
203            } else {
204                mEmptyView.setVisibility(View.GONE);
205            }
206
207            notifyDataSetChanged();
208        }
209
210        @Override
211        public View getView(int position, View convertView, ViewGroup parent) {
212            final Context context = parent.getContext();
213
214            if (convertView == null) {
215                final LayoutInflater inflater = LayoutInflater.from(context);
216                convertView = inflater.inflate(R.layout.item_doc_list, parent, false);
217            }
218
219            final ImageView iconMime = (ImageView) convertView.findViewById(R.id.icon_mime);
220            final TextView title = (TextView) convertView.findViewById(android.R.id.title);
221            final View line2 = convertView.findViewById(R.id.line2);
222
223            final DocumentStack stack = getItem(position);
224            iconMime.setImageDrawable(stack.root.loadIcon(context));
225
226            final Drawable crumb = context.getResources()
227                    .getDrawable(R.drawable.ic_breadcrumb_arrow);
228            crumb.setBounds(0, 0, crumb.getIntrinsicWidth(), crumb.getIntrinsicHeight());
229
230            final SpannableStringBuilder builder = new SpannableStringBuilder();
231            builder.append(stack.root.title);
232            for (int i = stack.size() - 2; i >= 0; i--) {
233                appendDrawable(builder, crumb);
234                builder.append(stack.get(i).displayName);
235            }
236            title.setText(builder);
237            title.setEllipsize(TruncateAt.MIDDLE);
238
239            if (line2 != null) line2.setVisibility(View.GONE);
240
241            return convertView;
242        }
243
244        @Override
245        public int getCount() {
246            return mStacks != null ? mStacks.size() : 0;
247        }
248
249        @Override
250        public DocumentStack getItem(int position) {
251            return mStacks.get(position);
252        }
253
254        @Override
255        public long getItemId(int position) {
256            return getItem(position).hashCode();
257        }
258    }
259
260    private static void appendDrawable(SpannableStringBuilder b, Drawable d) {
261        final int length = b.length();
262        b.append("\u232a");
263        b.setSpan(new ImageSpan(d), length, b.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
264    }
265}
266