mirror of https://github.com/TeamNewPipe/NewPipe
44 lines
1.7 KiB
Java
44 lines
1.7 KiB
Java
package org.schabi.newpipe.fragments;
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import android.support.v7.widget.LinearLayoutManager;
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import android.support.v7.widget.RecyclerView;
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import android.support.v7.widget.StaggeredGridLayoutManager;
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/**
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* Recycler view scroll listener which calls the method {@link #onScrolledDown(RecyclerView)}
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* if the view is scrolled below the last item.
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*/
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public abstract class OnScrollBelowItemsListener extends RecyclerView.OnScrollListener {
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@Override
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public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
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super.onScrolled(recyclerView, dx, dy);
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if (dy > 0) {
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int pastVisibleItems = 0, visibleItemCount, totalItemCount;
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RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();
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visibleItemCount = layoutManager.getChildCount();
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totalItemCount = layoutManager.getItemCount();
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// Already covers the GridLayoutManager case
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if (layoutManager instanceof LinearLayoutManager) {
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pastVisibleItems = ((LinearLayoutManager) layoutManager).findFirstVisibleItemPosition();
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} else if (layoutManager instanceof StaggeredGridLayoutManager) {
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int[] positions = ((StaggeredGridLayoutManager) layoutManager).findFirstVisibleItemPositions(null);
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if (positions != null && positions.length > 0) pastVisibleItems = positions[0];
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}
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if ((visibleItemCount + pastVisibleItems) >= totalItemCount) {
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onScrolledDown(recyclerView);
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}
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}
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}
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/**
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* Called when the recycler view is scrolled below the last item.
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*
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* @param recyclerView the recycler view
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*/
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public abstract void onScrolledDown(RecyclerView recyclerView);
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}
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