49 lines
1.8 KiB
Kotlin
49 lines
1.8 KiB
Kotlin
/* Copyright 2017 Andrew Dawson
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*
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* This file is a part of Tusky.
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*
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* This program is free software; you can redistribute it and/or modify it under the terms of the
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* GNU General Public License as published by the Free Software Foundation; either version 3 of the
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* License, or (at your option) any later version.
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*
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* Tusky is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
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* the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
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* Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with Tusky; if not,
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* see <http://www.gnu.org/licenses>. */
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package com.keylesspalace.tusky.view
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import androidx.recyclerview.widget.LinearLayoutManager
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import androidx.recyclerview.widget.RecyclerView
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abstract class EndlessOnScrollListener(private val layoutManager: LinearLayoutManager) :
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RecyclerView.OnScrollListener() {
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private var previousTotalItemCount = 0
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override fun onScrolled(view: RecyclerView, dx: Int, dy: Int) {
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val totalItemCount = layoutManager.itemCount
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val lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition()
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if (totalItemCount < previousTotalItemCount) {
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previousTotalItemCount = totalItemCount
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}
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if (totalItemCount != previousTotalItemCount) {
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previousTotalItemCount = totalItemCount
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}
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if (lastVisibleItemPosition + VISIBLE_THRESHOLD > totalItemCount) {
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onLoadMore(totalItemCount, view)
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}
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}
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fun reset() {
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previousTotalItemCount = 0
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}
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abstract fun onLoadMore(totalItemsCount: Int, view: RecyclerView)
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companion object {
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private const val VISIBLE_THRESHOLD = 15
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}
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}
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