packages/DocumentsUI/src/com/android/documentsui/RecentsCreateFragment.java - platform/frameworks/base - Git at Google

 /*
  * 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.Shared.TAG;
 import static com.android.documentsui.State.ACTION_CREATE;

 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.support.annotation.Nullable;
 import android.support.v7.widget.LinearLayoutManager;
 import android.support.v7.widget.RecyclerView;
 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.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;

 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 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 RecyclerView mRecView;
     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);

         mRecView = (RecyclerView) view.findViewById(R.id.dir_list);
         mRecView.setLayoutManager(new LinearLayoutManager(getContext()));
         mRecView.addOnItemTouchListener(mItemListener);

         mEmptyView = view.findViewById(android.R.id.empty);

         mAdapter = new DocumentStackAdapter();
         mRecView.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.update(data);

                 // When launched into empty recents, show drawer
                 if (mAdapter.isEmpty() && !state.hasLocationChanged()
                         && state.action != ACTION_CREATE
                         && context instanceof DocumentsActivity) {
                     ((DocumentsActivity) context).setRootsDrawerOpen(true);
                 }
             }

             @Override
             public void onLoaderReset(Loader<List<DocumentStack>> loader) {
                 mAdapter.update(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 RecyclerView.OnItemTouchListener mItemListener =
             new RecyclerView.OnItemTouchListener() {
                 @Override
                 public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
                     Events.MotionInputEvent event = new Events.MotionInputEvent(e, mRecView);
                     if (event.isOverItem() && event.isActionUp()) {
                         final DocumentStack stack = mAdapter.getItem(event.getItemPosition());
                         ((BaseActivity) getActivity()).onStackPicked(stack);
                         return true;
                     }
                     return false;
                 }

                 @Override
                 public void onTouchEvent(RecyclerView rv, MotionEvent e) {}
                 @Override
                 public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {}
             };

     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 = new ArrayList<>();

             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 static final class StackHolder extends RecyclerView.ViewHolder {
         public View view;
         public StackHolder(View view) {
             super(view);
             this.view = view;
         }
     }

     private class DocumentStackAdapter extends RecyclerView.Adapter<StackHolder> {
         @Nullable private List<DocumentStack> mItems;

         DocumentStack getItem(int position) {
             return mItems.get(position);
         }

         @Override
         public int getItemCount() {
             return mItems == null ? 0 : mItems.size();
         }

         boolean isEmpty() {
             return mItems == null ? true : mItems.isEmpty();
         }

         void update(@Nullable List<DocumentStack> items) {
             mItems = items;

             if (isEmpty()) {
                 mEmptyView.setVisibility(View.VISIBLE);
             } else {
                 mEmptyView.setVisibility(View.GONE);
             }

             notifyDataSetChanged();
         }

         @Override
         public StackHolder onCreateViewHolder(ViewGroup parent, int viewType) {
           final Context context = parent.getContext();

           final LayoutInflater inflater = LayoutInflater.from(context);
           return new StackHolder(
                   (View) inflater.inflate(R.layout.item_doc_list, parent, false));
         }

         @Override
         public void onBindViewHolder(StackHolder holder, int position) {
             Context context = getContext();
             View view = holder.view;

             final ImageView iconMime = (ImageView) view.findViewById(R.id.icon_mime);
             final TextView title = (TextView) view.findViewById(android.R.id.title);
             final View line2 = view.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);
         }
     }

     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);
     }
 }
	/*
	* 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.Shared.TAG;
	import static com.android.documentsui.State.ACTION_CREATE;

	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.support.annotation.Nullable;
	import android.support.v7.widget.LinearLayoutManager;
	import android.support.v7.widget.RecyclerView;
	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.MotionEvent;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.ImageView;
	import android.widget.TextView;

	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 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 RecyclerView mRecView;
	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);

	mRecView = (RecyclerView) view.findViewById(R.id.dir_list);
	mRecView.setLayoutManager(new LinearLayoutManager(getContext()));
	mRecView.addOnItemTouchListener(mItemListener);

	mEmptyView = view.findViewById(android.R.id.empty);

	mAdapter = new DocumentStackAdapter();
	mRecView.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.update(data);

	// When launched into empty recents, show drawer
	if (mAdapter.isEmpty() && !state.hasLocationChanged()
	&& state.action != ACTION_CREATE
	&& context instanceof DocumentsActivity) {
	((DocumentsActivity) context).setRootsDrawerOpen(true);
	}
	}

	@Override
	public void onLoaderReset(Loader<List<DocumentStack>> loader) {
	mAdapter.update(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 RecyclerView.OnItemTouchListener mItemListener =
	new RecyclerView.OnItemTouchListener() {
	@Override
	public boolean onInterceptTouchEvent(RecyclerView rv, MotionEvent e) {
	Events.MotionInputEvent event = new Events.MotionInputEvent(e, mRecView);
	if (event.isOverItem() && event.isActionUp()) {
	final DocumentStack stack = mAdapter.getItem(event.getItemPosition());
	((BaseActivity) getActivity()).onStackPicked(stack);
	return true;
	}
	return false;
	}

	@Override
	public void onTouchEvent(RecyclerView rv, MotionEvent e) {}
	@Override
	public void onRequestDisallowInterceptTouchEvent(boolean disallowIntercept) {}
	};

	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 = new ArrayList<>();

	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 static final class StackHolder extends RecyclerView.ViewHolder {
	public View view;
	public StackHolder(View view) {
	super(view);
	this.view = view;
	}
	}

	private class DocumentStackAdapter extends RecyclerView.Adapter<StackHolder> {
	@Nullable private List<DocumentStack> mItems;

	DocumentStack getItem(int position) {
	return mItems.get(position);
	}

	@Override
	public int getItemCount() {
	return mItems == null ? 0 : mItems.size();
	}

	boolean isEmpty() {
	return mItems == null ? true : mItems.isEmpty();
	}

	void update(@Nullable List<DocumentStack> items) {
	mItems = items;

	if (isEmpty()) {
	mEmptyView.setVisibility(View.VISIBLE);
	} else {
	mEmptyView.setVisibility(View.GONE);
	}

	notifyDataSetChanged();
	}

	@Override
	public StackHolder onCreateViewHolder(ViewGroup parent, int viewType) {
	final Context context = parent.getContext();

	final LayoutInflater inflater = LayoutInflater.from(context);
	return new StackHolder(
	(View) inflater.inflate(R.layout.item_doc_list, parent, false));
	}

	@Override
	public void onBindViewHolder(StackHolder holder, int position) {
	Context context = getContext();
	View view = holder.view;

	final ImageView iconMime = (ImageView) view.findViewById(R.id.icon_mime);
	final TextView title = (TextView) view.findViewById(android.R.id.title);
	final View line2 = view.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);
	}
	}

	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);
	}
	}