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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
17package com.android.documentsui;
18
19import static com.android.documentsui.Shared.TAG;
20import static com.android.documentsui.State.ACTION_CREATE;
21
22import android.app.Fragment;
23import android.app.FragmentManager;
24import android.app.FragmentTransaction;
25import android.app.LoaderManager.LoaderCallbacks;
26import android.content.ContentResolver;
27import android.content.Context;
28import android.content.Loader;
29import android.database.Cursor;
30import android.graphics.drawable.Drawable;
31import android.net.Uri;
32import android.os.Bundle;
33import android.os.CancellationSignal;
34import android.support.annotation.Nullable;
35import android.support.v7.widget.LinearLayoutManager;
36import android.support.v7.widget.RecyclerView;
37import android.text.Spannable;
38import android.text.SpannableStringBuilder;
39import android.text.TextUtils.TruncateAt;
40import android.text.style.ImageSpan;
41import android.util.Log;
42import android.view.LayoutInflater;
43import android.view.MotionEvent;
44import android.view.View;
45import android.view.ViewGroup;
46import android.widget.ImageView;
47import android.widget.TextView;
48
49import com.android.documentsui.RecentsProvider.RecentColumns;
50import com.android.documentsui.model.DocumentStack;
51import com.android.documentsui.model.DurableUtils;
52import com.android.documentsui.model.RootInfo;
53
54import libcore.io.IoUtils;
55
56import java.io.IOException;
57import java.util.ArrayList;
58import java.util.Collection;
59import java.util.List;
60
61/**
62 * Display directories where recent creates took place.
63 */
64public class RecentsCreateFragment extends Fragment {
65
66    private View mEmptyView;
67    private RecyclerView mRecView;
68    private DocumentStackAdapter mAdapter;
69    private LoaderCallbacks<List<DocumentStack>> mCallbacks;
70
71    private static final int LOADER_RECENTS = 3;
72
73    public static void show(FragmentManager fm) {
74        final RecentsCreateFragment fragment = new RecentsCreateFragment();
75        final FragmentTransaction ft = fm.beginTransaction();
76        ft.replace(R.id.container_directory, fragment);
77        ft.commitAllowingStateLoss();
78    }
79
80    @Override
81    public View onCreateView(
82            LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
83        final Context context = inflater.getContext();
84
85        final View view = inflater.inflate(R.layout.fragment_directory, container, false);
86
87        mRecView = (RecyclerView) view.findViewById(R.id.dir_list);
88        mRecView.setLayoutManager(new LinearLayoutManager(getContext()));
89        mRecView.addOnItemTouchListener(mItemListener);
90
91        mEmptyView = view.findViewById(android.R.id.empty);
92
93        mAdapter = new DocumentStackAdapter();
94        mRecView.setAdapter(mAdapter);
95
96        final RootsCache roots = DocumentsApplication.getRootsCache(context);
97        final State state = ((BaseActivity) getActivity()).getDisplayState();
98
99        mCallbacks = new LoaderCallbacks<List<DocumentStack>>() {
100            @Override
101            public Loader<List<DocumentStack>> onCreateLoader(int id, Bundle args) {
102                return new RecentsCreateLoader(context, roots, state);
103            }
104
105            @Override
106            public void onLoadFinished(
107                    Loader<List<DocumentStack>> loader, List<DocumentStack> data) {
108                mAdapter.update(data);
109
110                // When launched into empty recents, show drawer
111                if (mAdapter.isEmpty() && !state.hasLocationChanged()
112                        && state.action != ACTION_CREATE
113                        && context instanceof DocumentsActivity) {
114                    ((DocumentsActivity) context).setRootsDrawerOpen(true);
115                }
116            }
117
118            @Override
119            public void onLoaderReset(Loader<List<DocumentStack>> loader) {
120                mAdapter.update(null);
121            }
122        };
123
124        return view;
125    }
126
127    @Override
128    public void onStart() {
129        super.onStart();
130        getLoaderManager().restartLoader(LOADER_RECENTS, getArguments(), mCallbacks);
131    }
132
133    @Override
134    public void onStop() {
135        super.onStop();
136        getLoaderManager().destroyLoader(LOADER_RECENTS);
137    }
138
139    private RecyclerView.OnItemTouchListener mItemListener =
140            new RecyclerView.OnItemTouchListener() {
141                @Override
142                public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
143                    Events.MotionInputEvent event = new Events.MotionInputEvent(e, mRecView);
144                    if (event.isOverItem() && event.isActionUp()) {
145                        final DocumentStack stack = mAdapter.getItem(event.getItemPosition());
146                        ((BaseActivity) getActivity()).onStackPicked(stack);
147                        return true;
148                    }
149                    return false;
150                }
151
152                @Override
153                public void onTouchEvent(RecyclerView rv, MotionEvent e) {}
154                @Override
155                public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {}
156            };
157
158    public static class RecentsCreateLoader extends UriDerivativeLoader<Uri, List<DocumentStack>> {
159        private final RootsCache mRoots;
160        private final State mState;
161
162        public RecentsCreateLoader(Context context, RootsCache roots, State state) {
163            super(context, RecentsProvider.buildRecent());
164            mRoots = roots;
165            mState = state;
166        }
167
168        @Override
169        public List<DocumentStack> loadInBackground(Uri uri, CancellationSignal signal) {
170            final Collection<RootInfo> matchingRoots = mRoots.getMatchingRootsBlocking(mState);
171            final ArrayList<DocumentStack> result = new ArrayList<>();
172
173            final ContentResolver resolver = getContext().getContentResolver();
174            final Cursor cursor = resolver.query(
175                    uri, null, null, null, RecentColumns.TIMESTAMP + " DESC", signal);
176            try {
177                while (cursor != null && cursor.moveToNext()) {
178                    final byte[] rawStack = cursor.getBlob(
179                            cursor.getColumnIndex(RecentColumns.STACK));
180                    try {
181                        final DocumentStack stack = new DocumentStack();
182                        DurableUtils.readFromArray(rawStack, stack);
183
184                        // Only update root here to avoid spinning up all
185                        // providers; we update the stack during the actual
186                        // restore. This also filters away roots that don't
187                        // match current filter.
188                        stack.updateRoot(matchingRoots);
189                        result.add(stack);
190                    } catch (IOException e) {
191                        Log.w(TAG, "Failed to resolve stack: " + e);
192                    }
193                }
194            } finally {
195                IoUtils.closeQuietly(cursor);
196            }
197
198            return result;
199        }
200    }
201
202    private static final class StackHolder extends RecyclerView.ViewHolder {
203        public View view;
204        public StackHolder(View view) {
205            super(view);
206            this.view = view;
207        }
208    }
209
210    private class DocumentStackAdapter extends RecyclerView.Adapter<StackHolder> {
211        @Nullable private List<DocumentStack> mItems;
212
213        DocumentStack getItem(int position) {
214            return mItems.get(position);
215        }
216
217        @Override
218        public int getItemCount() {
219            return mItems == null ? 0 : mItems.size();
220        }
221
222        boolean isEmpty() {
223            return mItems == null ? true : mItems.isEmpty();
224        }
225
226        void update(@Nullable List<DocumentStack> items) {
227            mItems = items;
228
229            if (isEmpty()) {
230                mEmptyView.setVisibility(View.VISIBLE);
231            } else {
232                mEmptyView.setVisibility(View.GONE);
233            }
234
235            notifyDataSetChanged();
236        }
237
238        @Override
239        public StackHolder onCreateViewHolder(ViewGroup parent, int viewType) {
240          final Context context = parent.getContext();
241
242          final LayoutInflater inflater = LayoutInflater.from(context);
243          return new StackHolder(
244                  (View) inflater.inflate(R.layout.item_doc_list, parent, false));
245        }
246
247        @Override
248        public void onBindViewHolder(StackHolder holder, int position) {
249            Context context = getContext();
250            View view = holder.view;
251
252            final ImageView iconMime = (ImageView) view.findViewById(R.id.icon_mime);
253            final TextView title = (TextView) view.findViewById(android.R.id.title);
254            final View line2 = view.findViewById(R.id.line2);
255
256            final DocumentStack stack = getItem(position);
257            iconMime.setImageDrawable(stack.root.loadIcon(context));
258
259            final Drawable crumb = context.getDrawable(R.drawable.ic_breadcrumb_arrow);
260            crumb.setBounds(0, 0, crumb.getIntrinsicWidth(), crumb.getIntrinsicHeight());
261
262            final SpannableStringBuilder builder = new SpannableStringBuilder();
263            builder.append(stack.root.title);
264            for (int i = stack.size() - 2; i >= 0; i--) {
265                appendDrawable(builder, crumb);
266                builder.append(stack.get(i).displayName);
267            }
268            title.setText(builder);
269            title.setEllipsize(TruncateAt.MIDDLE);
270
271            if (line2 != null) line2.setVisibility(View.GONE);
272        }
273    }
274
275    private static void appendDrawable(SpannableStringBuilder b, Drawable d) {
276        final int length = b.length();
277        b.append("\u232a");
278        b.setSpan(new ImageSpan(d), length, b.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
279    }
280}
281