FavoriteFragment.java

/*
 * Copyright (c) 2015 Ha Duy Trung
 *
 * 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 io.github.hidroh.materialistic;

import android.app.SearchManager;
import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.view.ActionMode;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.SearchView;
import android.text.TextUtils;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;

import javax.inject.Inject;

import io.github.hidroh.materialistic.data.FavoriteManager;
import io.github.hidroh.materialistic.data.LocalItemManager;
import io.github.hidroh.materialistic.widget.FavoriteRecyclerViewAdapter;
import io.github.hidroh.materialistic.widget.ListRecyclerViewAdapter;

public class FavoriteFragment extends BaseListFragment
        implements FavoriteRecyclerViewAdapter.ActionModeDelegate, LocalItemManager.Observer {
    public static final String EXTRA_FILTER = FavoriteFragment.class.getName() + ".EXTRA_FILTER";
    private static final String STATE_FILTER = "state:filter";
    private static final String STATE_SEARCH_VIEW_EXPANDED = "state:searchViewExpanded";
    private final FavoriteRecyclerViewAdapter mAdapter = new FavoriteRecyclerViewAdapter(this);
    private ActionMode mActionMode;
    private String mFilter;
    private boolean mSearchViewExpanded;
    @Inject FavoriteManager mFavoriteManager;
    @Inject ActionViewResolver mActionViewResolver;
    @Inject AlertDialogBuilder mAlertDialogBuilder;
    private View mEmptySearchView;
    private View mEmptyView;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (savedInstanceState != null) {
            mFilter = savedInstanceState.getString(STATE_FILTER);
            mSearchViewExpanded = savedInstanceState.getBoolean(STATE_SEARCH_VIEW_EXPANDED);
        } else {
            mFilter = getArguments().getString(EXTRA_FILTER);
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
                             @Nullable Bundle savedInstanceState) {
        View view = getLayoutInflater(savedInstanceState)
                .inflate(R.layout.fragment_favorite, container, false);
        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        mEmptySearchView = view.findViewById(R.id.empty_search);
        mEmptyView = view.findViewById(R.id.empty);
        mEmptyView.findViewById(R.id.header_card_view)
                .setOnLongClickListener(v -> {
                    View bookmark = mEmptyView.findViewById(R.id.bookmarked);
                    bookmark.setVisibility(bookmark.getVisibility() == View.VISIBLE ?
                                    View.INVISIBLE : View.VISIBLE);
                    return true;
                });
        mEmptyView.setVisibility(View.INVISIBLE);
        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mFavoriteManager.attach(getActivity(), getLoaderManager(), this, mFilter);
    }

    @Override
    protected void createOptionsMenu(final Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.menu_search, menu);
        createSearchView(menu.findItem(R.id.menu_search));
        if (mAdapter.getItemCount() > 0) {
            inflater.inflate(R.menu.menu_favorite, menu);
            super.createOptionsMenu(menu, inflater);
        }
    }

    @Override
    protected void prepareOptionsMenu(Menu menu) {
        // allow clearing filter if empty, or filter if non-empty
        menu.findItem(R.id.menu_search).setVisible(!TextUtils.isEmpty(mFilter) ||
                mAdapter.getItemCount() > 0);
        if (mAdapter.getItemCount() > 0) {
            super.prepareOptionsMenu(menu);
        }
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.menu_clear) {
            clear();
            return true;
        }
        if (item.getItemId() == R.id.menu_export) {
            mFavoriteManager.export(getActivity(), mFilter);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putString(STATE_FILTER, mFilter);
        outState.putBoolean(STATE_SEARCH_VIEW_EXPANDED, mSearchViewExpanded);
    }

    @Override
    public void onDetach() {
        super.onDetach();
        mFavoriteManager.detach();
        if (mActionMode != null) {
            mActionMode.finish();
        }
    }

    /**
     * Filters list data by given query
     * @param query query used to filter data
     */
    public void filter(String query) {
        mSearchViewExpanded = false;
        mFilter = query;
        mFavoriteManager.attach(getActivity(), getLoaderManager(), this, mFilter);
    }

    @Override
    protected ListRecyclerViewAdapter getAdapter() {
        return mAdapter;
    }

    @Override
    public boolean startActionMode(ActionMode.Callback callback) {
        if (mSearchViewExpanded) {
            return false;
        }
        if (mActionMode == null) {
            mActionMode = ((AppCompatActivity) getActivity()).startSupportActionMode(callback);
        }
        return true;
    }

    @Override
    public boolean isInActionMode() {
        return mActionMode != null && !mSearchViewExpanded;
    }

    @Override
    public void stopActionMode() {
        mActionMode = null;
    }

    @Override
    public void onChanged() {
        mAdapter.notifyChanged();
        if (!isDetached()) {
            toggleEmptyView(mAdapter.getItemCount() == 0, mFilter);
            getActivity().supportInvalidateOptionsMenu();
        }
    }

    private void toggleEmptyView(boolean isEmpty, String filter) {
        if (isEmpty) {
            if (TextUtils.isEmpty(filter)) {
                mEmptySearchView.setVisibility(View.INVISIBLE);
                mEmptyView.setVisibility(View.VISIBLE);
                mEmptyView.bringToFront();
            } else {
                mEmptyView.setVisibility(View.INVISIBLE);
                mEmptySearchView.setVisibility(View.VISIBLE);
                mEmptySearchView.bringToFront();
            }
        } else {
            mEmptyView.setVisibility(View.INVISIBLE);
            mEmptySearchView.setVisibility(View.INVISIBLE);
        }
    }

    private void createSearchView(MenuItem menuSearch) {
        final SearchView searchView = (SearchView) mActionViewResolver.getActionView(menuSearch);
        searchView.setQueryHint(getString(R.string.hint_search_saved_stories));
        searchView.setSearchableInfo(((SearchManager) getActivity()
                .getSystemService(Context.SEARCH_SERVICE))
                .getSearchableInfo(getActivity().getComponentName()));
        searchView.setIconified(!mSearchViewExpanded);
        searchView.setQuery(mFilter, false);
        searchView.setOnSearchClickListener(v -> {
            mSearchViewExpanded = true;
            v.requestFocus();
        });
        searchView.setOnCloseListener(() -> {
            // trigger a dummy empty search intent, as empty query does not get submitted
            searchView.setQuery(FavoriteActivity.EMPTY_QUERY, true);
            return false;
        });
    }

    private void clear() {
        mAlertDialogBuilder
                .init(getActivity())
                .setMessage(R.string.confirm_clear)
                .setPositiveButton(android.R.string.ok,
                        (dialog, which) -> mFavoriteManager.clear(getActivity(), mFilter))
                .setNegativeButton(android.R.string.cancel, null)
                .create().show();
    }
}