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Preloader support for StaggeredGridLayputManager #5324

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Preloader support for StaggeredGridLayputManager #5324

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95df923
Preloader support for StaggeredGridLayputManager
Nov 2, 2023
a3c8e4a
Fix package name
Nov 2, 2023
a7c5905
Fix file formatting
Nov 2, 2023
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31 changes: 27 additions & 4 deletions ...in/java/com/bumptech/glide/integration/recyclerview/RecyclerToListViewScrollListener.java
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Original file line number Diff line number Diff line change
Expand Up @@ -5,6 +5,7 @@
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.recyclerview.widget.StaggeredGridLayoutManager;

/**
* Converts {@link androidx.recyclerview.widget.RecyclerView.OnScrollListener} events to {@link
Expand Down Expand Up @@ -47,11 +48,33 @@ public void onScrollStateChanged(RecyclerView recyclerView, int newState) {

@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
LinearLayoutManager layoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

int firstVisible = layoutManager.findFirstVisibleItemPosition();
int visibleCount = Math.abs(firstVisible - layoutManager.findLastVisibleItemPosition());
int itemCount = recyclerView.getAdapter().getItemCount();
int firstVisible = RecyclerView.NO_POSITION;
int visibleCount = 0;

RecyclerView.LayoutManager layoutManager = recyclerView.getLayoutManager();

if (layoutManager instanceof LinearLayoutManager) {
LinearLayoutManager linearLayoutManager = (LinearLayoutManager) layoutManager;

firstVisible = linearLayoutManager.findFirstVisibleItemPosition();
visibleCount = Math.abs(firstVisible - linearLayoutManager.findLastVisibleItemPosition());
} else if (layoutManager instanceof StaggeredGridLayoutManager) {
StaggeredGridLayoutManager staggeredGridLayoutManager = (StaggeredGridLayoutManager) layoutManager;

int[] firstVisiblePositions = staggeredGridLayoutManager.findFirstVisibleItemPositions(null);

if (firstVisiblePositions.length > 0) {
firstVisible = firstVisiblePositions[0];

int[] lastVisiblePositions = staggeredGridLayoutManager.findLastVisibleItemPositions(null);

if (lastVisiblePositions.length > 0) {
int lastVisible = lastVisiblePositions[0];
visibleCount = Math.abs(firstVisible - lastVisible);
}
}
}

if (firstVisible != lastFirstVisible
|| visibleCount != lastVisibleCount
Expand Down