/*
* Copyright (C) 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.documentsui;
import static com.android.documentsui.DocumentsActivity.TAG;
import android.app.Fragment;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Loader;
import android.database.Cursor;
import android.graphics.drawable.Drawable;
import android.net.Uri;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.text.Spannable;
import android.text.SpannableStringBuilder;
import android.text.TextUtils.TruncateAt;
import android.text.style.ImageSpan;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;
import com.android.documentsui.BaseActivity.State;
import com.android.documentsui.RecentsProvider.RecentColumns;
import com.android.documentsui.model.DocumentStack;
import com.android.documentsui.model.DurableUtils;
import com.android.documentsui.model.RootInfo;
import com.google.android.collect.Lists;
import libcore.io.IoUtils;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
/**
* Display directories where recent creates took place.
*/
public class RecentsCreateFragment extends Fragment {
private View mEmptyView;
private ListView mListView;
private DocumentStackAdapter mAdapter;
private LoaderCallbacks<List<DocumentStack>> mCallbacks;
private static final int LOADER_RECENTS = 3;
public static void show(FragmentManager fm) {
final RecentsCreateFragment fragment = new RecentsCreateFragment();
final FragmentTransaction ft = fm.beginTransaction();
ft.replace(R.id.container_directory, fragment);
ft.commitAllowingStateLoss();
}
@Override
public View onCreateView(
LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
final Context context = inflater.getContext();
final View view = inflater.inflate(R.layout.fragment_directory, container, false);
mEmptyView = view.findViewById(android.R.id.empty);
mListView = (ListView) view.findViewById(R.id.list);
mListView.setOnItemClickListener(mItemListener);
mAdapter = new DocumentStackAdapter();
mListView.setAdapter(mAdapter);
final RootsCache roots = DocumentsApplication.getRootsCache(context);
final State state = ((BaseActivity) getActivity()).getDisplayState();
mCallbacks = new LoaderCallbacks<List<DocumentStack>>() {
@Override
public Loader<List<DocumentStack>> onCreateLoader(int id, Bundle args) {
return new RecentsCreateLoader(context, roots, state);
}
@Override
public void onLoadFinished(
Loader<List<DocumentStack>> loader, List<DocumentStack> data) {
mAdapter.swapStacks(data);
// When launched into empty recents, show drawer
if (mAdapter.isEmpty() && !state.stackTouched &&
context instanceof DocumentsActivity) {
((DocumentsActivity) context).setRootsDrawerOpen(true);
}
}
@Override
public void onLoaderReset(Loader<List<DocumentStack>> loader) {
mAdapter.swapStacks(null);
}
};
return view;
}
@Override
public void onStart() {
super.onStart();
getLoaderManager().restartLoader(LOADER_RECENTS, getArguments(), mCallbacks);
}
@Override
public void onStop() {
super.onStop();
getLoaderManager().destroyLoader(LOADER_RECENTS);
}
private OnItemClickListener mItemListener = new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
final DocumentStack stack = mAdapter.getItem(position);
((BaseActivity) getActivity()).onStackPicked(stack);
}
};
public static class RecentsCreateLoader extends UriDerivativeLoader<Uri, List<DocumentStack>> {
private final RootsCache mRoots;
private final State mState;
public RecentsCreateLoader(Context context, RootsCache roots, State state) {
super(context, RecentsProvider.buildRecent());
mRoots = roots;
mState = state;
}
@Override
public List<DocumentStack> loadInBackground(Uri uri, CancellationSignal signal) {
final Collection<RootInfo> matchingRoots = mRoots.getMatchingRootsBlocking(mState);
final ArrayList<DocumentStack> result = Lists.newArrayList();
final ContentResolver resolver = getContext().getContentResolver();
final Cursor cursor = resolver.query(
uri, null, null, null, RecentColumns.TIMESTAMP + " DESC", signal);
try {
while (cursor != null && cursor.moveToNext()) {
final byte[] rawStack = cursor.getBlob(
cursor.getColumnIndex(RecentColumns.STACK));
try {
final DocumentStack stack = new DocumentStack();
DurableUtils.readFromArray(rawStack, stack);
// Only update root here to avoid spinning up all
// providers; we update the stack during the actual
// restore. This also filters away roots that don't
// match current filter.
stack.updateRoot(matchingRoots);
result.add(stack);
} catch (IOException e) {
Log.w(TAG, "Failed to resolve stack: " + e);
}
}
} finally {
IoUtils.closeQuietly(cursor);
}
return result;
}
}
private class DocumentStackAdapter extends BaseAdapter {
private List<DocumentStack> mStacks;
public DocumentStackAdapter() {
}
public void swapStacks(List<DocumentStack> stacks) {
mStacks = stacks;
if (isEmpty()) {
mEmptyView.setVisibility(View.VISIBLE);
} else {
mEmptyView.setVisibility(View.GONE);
}
notifyDataSetChanged();
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
final Context context = parent.getContext();
if (convertView == null) {
final LayoutInflater inflater = LayoutInflater.from(context);
convertView = inflater.inflate(R.layout.item_doc_list, parent, false);
}
final ImageView iconMime = (ImageView) convertView.findViewById(R.id.icon_mime);
final TextView title = (TextView) convertView.findViewById(android.R.id.title);
final View line2 = convertView.findViewById(R.id.line2);
final DocumentStack stack = getItem(position);
iconMime.setImageDrawable(stack.root.loadIcon(context));
final Drawable crumb = context.getDrawable(R.drawable.ic_breadcrumb_arrow);
crumb.setBounds(0, 0, crumb.getIntrinsicWidth(), crumb.getIntrinsicHeight());
final SpannableStringBuilder builder = new SpannableStringBuilder();
builder.append(stack.root.title);
for (int i = stack.size() - 2; i >= 0; i--) {
appendDrawable(builder, crumb);
builder.append(stack.get(i).displayName);
}
title.setText(builder);
title.setEllipsize(TruncateAt.MIDDLE);
if (line2 != null) line2.setVisibility(View.GONE);
return convertView;
}
@Override
public int getCount() {
return mStacks != null ? mStacks.size() : 0;
}
@Override
public DocumentStack getItem(int position) {
return mStacks.get(position);
}
@Override
public long getItemId(int position) {
return getItem(position).hashCode();
}
}
private static void appendDrawable(SpannableStringBuilder b, Drawable d) {
final int length = b.length();
b.append("\u232a");
b.setSpan(new ImageSpan(d), length, b.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
}
}