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metu.life-android/app/src/main/java/com/keylesspalace/tusky/view/EndlessOnScrollListener.java

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/* Copyright 2017 Andrew Dawson
*
* This file is a part of Tusky.
*
* 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.
*
* Tusky 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 Tusky; if not,
* see <http://www.gnu.org/licenses>. */
package com.keylesspalace.tusky.view;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
public abstract class EndlessOnScrollListener extends RecyclerView.OnScrollListener {
private static final int VISIBLE_THRESHOLD = 15;
private int previousTotalItemCount;
private LinearLayoutManager layoutManager;
public EndlessOnScrollListener(LinearLayoutManager layoutManager) {
this.layoutManager = layoutManager;
previousTotalItemCount = 0;
}
@Override
public void onScrolled(@NonNull RecyclerView view, int dx, int dy) {
int totalItemCount = layoutManager.getItemCount();
int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
if (totalItemCount < previousTotalItemCount) {
previousTotalItemCount = totalItemCount;
}
if (totalItemCount != previousTotalItemCount) {
previousTotalItemCount = totalItemCount;
}
if (lastVisibleItemPosition + VISIBLE_THRESHOLD > totalItemCount) {
onLoadMore(totalItemCount, view);
}
}
public void reset() {
previousTotalItemCount = 0;
}
public abstract void onLoadMore(int totalItemsCount, RecyclerView view);
}