Twidere-App-Android-Twitter-Mastodon/twidere/src/main/java/org/mariotaku/twidere/fragment/support/AbsActivitiesFragment.java

/*
 * Twidere - Twitter client for Android
 *
 *  Copyright (C) 2012-2015 Mariotaku Lee <mariotaku.lee@gmail.com>
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.mariotaku.twidere.fragment.support;

import android.content.Context;
import android.content.SharedPreferences;
import android.graphics.Rect;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.Loader;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.OnScrollListener;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

import com.squareup.otto.Bus;

import org.mariotaku.twidere.R;
import org.mariotaku.twidere.adapter.AbsActivitiesAdapter;
import org.mariotaku.twidere.adapter.decorator.DividerItemDecoration;
import org.mariotaku.twidere.app.TwidereApplication;
import org.mariotaku.twidere.fragment.iface.RefreshScrollTopInterface;
import org.mariotaku.twidere.util.AsyncTwitterWrapper;
import org.mariotaku.twidere.util.SimpleDrawerCallback;
import org.mariotaku.twidere.util.ThemeUtils;
import org.mariotaku.twidere.util.Utils;
import org.mariotaku.twidere.view.HeaderDrawerLayout.DrawerCallback;

/**
 * Created by mariotaku on 14/11/5.
 */
public abstract class AbsActivitiesFragment<Data> extends BaseSupportFragment implements LoaderCallbacks<Data>,
        OnRefreshListener, DrawerCallback, RefreshScrollTopInterface {


    private final Object mStatusesBusCallback;

    protected AbsActivitiesFragment() {
        mStatusesBusCallback = createMessageBusCallback();
    }

    private View mContentView;
    private SharedPreferences mPreferences;
    private View mProgressContainer;
    private SwipeRefreshLayout mSwipeRefreshLayout;
    private RecyclerView mRecyclerView;
    private AbsActivitiesAdapter<Data> mAdapter;
    private SimpleDrawerCallback mDrawerCallback;
    private OnScrollListener mOnScrollListener = new OnScrollListener() {

        private int mScrollState;

        @Override
        public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
            super.onScrollStateChanged(recyclerView, newState);
            mScrollState = newState;
        }

        @Override
        public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
            final LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
            if (isRefreshing()) return;
            if (mAdapter.hasLoadMoreIndicator() && mScrollState != RecyclerView.SCROLL_STATE_IDLE
                    && layoutManager.findLastVisibleItemPosition() == mAdapter.getItemCount() - 1) {
                onLoadMoreStatuses();
            }
        }
    };

    @Override
    public boolean canScroll(float dy) {
        return mDrawerCallback.canScroll(dy);
    }

    @Override
    public void cancelTouch() {
        mDrawerCallback.cancelTouch();
    }

    @Override
    public void fling(float velocity) {
        mDrawerCallback.fling(velocity);
    }

    @Override
    public boolean isScrollContent(float x, float y) {
        return mDrawerCallback.isScrollContent(x, y);
    }

    @Override
    public void scrollBy(float dy) {
        mDrawerCallback.scrollBy(dy);
    }

    @Override
    public boolean shouldLayoutHeaderBottom() {
        return mDrawerCallback.shouldLayoutHeaderBottom();
    }

    @Override
    public void topChanged(int offset) {
        mDrawerCallback.topChanged(offset);
    }

    public AbsActivitiesAdapter<Data> getAdapter() {
        return mAdapter;
    }

    public SharedPreferences getSharedPreferences() {
        if (mPreferences != null) return mPreferences;
        return mPreferences = getSharedPreferences(SHARED_PREFERENCES_NAME, Context.MODE_PRIVATE);
    }

    public abstract int getStatuses(long[] accountIds, long[] maxIds, long[] sinceIds);

    public boolean isRefreshing() {
        return mSwipeRefreshLayout.isRefreshing();
    }

    public void setRefreshing(boolean refreshing) {
        mSwipeRefreshLayout.setRefreshing(refreshing);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_recycler_view, container, false);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        final View view = getView();
        if (view == null) throw new AssertionError();
        final Context context = view.getContext();
        final boolean compact = Utils.isCompactCards(context);
        mDrawerCallback = new SimpleDrawerCallback(mRecyclerView);
        mSwipeRefreshLayout.setOnRefreshListener(this);
        mSwipeRefreshLayout.setColorSchemeColors(ThemeUtils.getUserAccentColor(context));
        mAdapter = onCreateAdapter(context, compact);
        mAdapter.setLoadMoreIndicatorEnabled(true);
        final LinearLayoutManager layoutManager = new LinearLayoutManager(context);
        layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
        mRecyclerView.setLayoutManager(layoutManager);
        if (compact) {
            mRecyclerView.addItemDecoration(new DividerItemDecoration(context, layoutManager.getOrientation()));
        }
        mRecyclerView.setAdapter(mAdapter);
        mRecyclerView.setOnScrollListener(mOnScrollListener);
        getLoaderManager().initLoader(0, getArguments(), this);
        setListShown(false);
    }

    @Override
    public void onStart() {
        super.onStart();
        final Bus bus = TwidereApplication.getInstance(getActivity()).getMessageBus();
        bus.register(mStatusesBusCallback);
    }

    @Override
    public void onStop() {
        final Bus bus = TwidereApplication.getInstance(getActivity()).getMessageBus();
        bus.unregister(mStatusesBusCallback);
        super.onStop();
    }

    @Override
    public void onLoadFinished(Loader<Data> loader, Data data) {
        setRefreshing(false);
        mAdapter.setData(data);
        setListShown(true);
    }

    @Override
    public void onLoaderReset(Loader<Data> loader) {
    }

    @Override
    public void onRefresh() {
        triggerRefresh();
    }


    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        mContentView = view.findViewById(R.id.fragment_content);
        mProgressContainer = view.findViewById(R.id.progress_container);
        mSwipeRefreshLayout = (SwipeRefreshLayout) view.findViewById(R.id.swipe_layout);
        mRecyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
        super.onViewCreated(view, savedInstanceState);
    }

    @Override
    protected void fitSystemWindows(Rect insets) {
        super.fitSystemWindows(insets);
        mContentView.setPadding(insets.left, insets.top, insets.right, insets.bottom);
    }

    @Override
    public boolean scrollToStart() {
        final AsyncTwitterWrapper twitter = getTwitterWrapper();
        final int tabPosition = getTabPosition();
        if (twitter != null && tabPosition != -1) {
            twitter.clearUnreadCountAsync(tabPosition);
        }
        mRecyclerView.smoothScrollToPosition(0);
        return true;
    }

    protected abstract long[] getAccountIds();

    protected Data getAdapterData() {
        return mAdapter.getData();
    }

    protected void setAdapterData(Data data) {
        mAdapter.setData(data);
    }

    protected Object createMessageBusCallback() {
        return new StatusesBusCallback();
    }

    protected abstract AbsActivitiesAdapter<Data> onCreateAdapter(Context context, boolean compact);

    protected abstract void onLoadMoreStatuses();

    private void setListShown(boolean shown) {
        mProgressContainer.setVisibility(shown ? View.GONE : View.VISIBLE);
        mSwipeRefreshLayout.setVisibility(shown ? View.VISIBLE : View.GONE);
    }


    protected final class StatusesBusCallback {

        protected StatusesBusCallback() {
        }


    }
}