BaseListFragment.java

/*
 * 				Firetweet - Twitter client for Android
 * 
 *  Copyright (C) 2012-2014 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.getlantern.firetweet.fragment;

import android.app.Activity;
import android.app.ListFragment;
import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.widget.AbsListView;
import android.widget.AbsListView.OnScrollListener;
import android.widget.ListView;

import org.getlantern.firetweet.Constants;
import org.getlantern.firetweet.app.FiretweetApplication;
import org.getlantern.firetweet.fragment.iface.RefreshScrollTopInterface;
import org.getlantern.firetweet.util.AsyncTwitterWrapper;
import org.getlantern.firetweet.util.MultiSelectManager;
import org.getlantern.firetweet.util.Utils;

public class BaseListFragment extends ListFragment implements Constants, OnScrollListener, RefreshScrollTopInterface {

    private boolean mActivityFirstCreated;
    private boolean mIsInstanceStateSaved;

    private boolean mReachedBottom, mNotReachedBottomBefore = true;

    public final FiretweetApplication getApplication() {
        return FiretweetApplication.getInstance(getActivity());
    }

    public final ContentResolver getContentResolver() {
        final Activity activity = getActivity();
        if (activity != null) return activity.getContentResolver();
        return null;
    }

    public final MultiSelectManager getMultiSelectManager() {
        return getApplication() != null ? getApplication().getMultiSelectManager() : null;
    }

    public final SharedPreferences getSharedPreferences(final String name, final int mode) {
        final Activity activity = getActivity();
        if (activity != null) return activity.getSharedPreferences(name, mode);
        return null;
    }

    public final Object getSystemService(final String name) {
        final Activity activity = getActivity();
        if (activity != null) return activity.getSystemService(name);
        return null;
    }

    public final int getTabPosition() {
        final Bundle args = getArguments();
        return args != null ? args.getInt(EXTRA_TAB_POSITION, -1) : -1;
    }

    public AsyncTwitterWrapper getTwitterWrapper() {
        return getApplication() != null ? getApplication().getTwitterWrapper() : null;
    }

    public void invalidateOptionsMenu() {
        final Activity activity = getActivity();
        if (activity == null) return;
        activity.invalidateOptionsMenu();
    }

    public boolean isActivityFirstCreated() {
        return mActivityFirstCreated;
    }

    public boolean isInstanceStateSaved() {
        return mIsInstanceStateSaved;
    }

    public boolean isReachedBottom() {
        return mReachedBottom;
    }

    @Override
    public void onActivityCreated(final Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        mIsInstanceStateSaved = savedInstanceState != null;
        final ListView lv = getListView();
        lv.setOnScrollListener(this);
    }

    @Override
    public void onAttach(final Activity activity) {
        super.onAttach(activity);
    }

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mActivityFirstCreated = true;
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mActivityFirstCreated = true;
    }

    public void onPostStart() {
    }

    @Override
    public void onScroll(final AbsListView view, final int firstVisibleItem, final int visibleItemCount,
                         final int totalItemCount) {
        final boolean reached = firstVisibleItem + visibleItemCount >= totalItemCount
                && totalItemCount >= visibleItemCount;

        if (mReachedBottom != reached) {
            mReachedBottom = reached;
            if (mReachedBottom && mNotReachedBottomBefore) {
                mNotReachedBottomBefore = false;
                return;
            }
            if (mReachedBottom && getListAdapter().getCount() > visibleItemCount) {
                onReachedBottom();
            }
        }

    }

    @Override
    public void onScrollStateChanged(final AbsListView view, final int scrollState) {

    }

    @Override
    public void onStart() {
        super.onStart();
        onPostStart();
    }

    @Override
    public void onStop() {
        mActivityFirstCreated = false;
        super.onStop();
    }

    public void registerReceiver(final BroadcastReceiver receiver, final IntentFilter filter) {
        final Activity activity = getActivity();
        if (activity == null) return;
        activity.registerReceiver(receiver, filter);
    }

    @Override
    public boolean scrollToStart() {
        Utils.scrollListToTop(getListView());
        return true;
    }

    public void setProgressBarIndeterminateVisibility(final boolean visible) {
        final Activity activity = getActivity();
        if (activity == null) return;
        activity.setProgressBarIndeterminateVisibility(visible);
    }

    @Override
    public void setSelection(final int position) {
        Utils.scrollListToPosition(getListView(), position);
    }

    @Override
    public boolean triggerRefresh() {
        return false;
    }

    public void unregisterReceiver(final BroadcastReceiver receiver) {
        final Activity activity = getActivity();
        if (activity == null) return;
        activity.unregisterReceiver(receiver);
    }

    protected void onReachedBottom() {

    }
}