48 lines
1.6 KiB
Java
48 lines
1.6 KiB
Java
package com.keylesspalace.tusky;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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public abstract class EndlessOnScrollListener extends RecyclerView.OnScrollListener {
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private int visibleThreshold = 15;
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private int currentPage = 0;
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private int previousTotalItemCount = 0;
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private boolean loading = true;
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private int startingPageIndex = 0;
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private LinearLayoutManager layoutManager;
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public EndlessOnScrollListener(LinearLayoutManager layoutManager) {
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this.layoutManager = layoutManager;
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}
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@Override
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public void onScrolled(RecyclerView view, int dx, int dy) {
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int totalItemCount = layoutManager.getItemCount();
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int lastVisibleItemPosition = layoutManager.findLastVisibleItemPosition();
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if (totalItemCount < previousTotalItemCount) {
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currentPage = startingPageIndex;
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previousTotalItemCount = totalItemCount;
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if (totalItemCount == 0) {
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loading = true;
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}
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}
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if (loading && totalItemCount > previousTotalItemCount) {
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loading = false;
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previousTotalItemCount = totalItemCount;
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}
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if (!loading && lastVisibleItemPosition + visibleThreshold > totalItemCount) {
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currentPage++;
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onLoadMore(currentPage, totalItemCount, view);
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loading = true;
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}
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}
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public void reset() {
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currentPage = startingPageIndex;
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previousTotalItemCount = 0;
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loading = true;
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}
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public abstract void onLoadMore(int page, int totalItemsCount, RecyclerView view);
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}
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