LazyGridPrefetchStrategy

import androidx.compose.foundation.layout.height
import androidx.compose.foundation.layout.size
import androidx.compose.foundation.lazy.grid.GridCells
import androidx.compose.foundation.lazy.grid.LazyGridState
import androidx.compose.foundation.lazy.grid.LazyVerticalGrid
import androidx.compose.foundation.lazy.grid.items
import androidx.compose.foundation.lazy.grid.rememberLazyGridState
import androidx.compose.foundation.lazy.layout.LazyLayoutCacheWindow
import androidx.compose.material3.Text
import androidx.compose.runtime.remember
import androidx.compose.ui.unit.Density

val itemsList = (0..100).toList()
val state = rememberLazyGridState()

// Migrating from LazyGridPrefetchStrategy (which scheduled prefetching for individual
// items/lines):
// Use LazyLayoutCacheWindow to dynamically calculate the prefetch cache window in pixels based
// on average item size from LazyGridState layoutInfo.
val customCacheWindow =
    remember(state) {
        object : LazyLayoutCacheWindow {
            override fun Density.calculateAheadWindow(viewport: Int): Int {
                val visibleItems = state.layoutInfo.visibleItemsInfo
                if (visibleItems.isEmpty()) return 0
                val averageItemHeight =
                    visibleItems.sumOf { it.size.height } / visibleItems.size
                // Prefetch 1 line ahead based on average item height
                return averageItemHeight
            }
        }
    }

LazyVerticalGrid(columns = GridCells.Fixed(3), state = state, cacheWindow = customCacheWindow) {
    items(itemsList) { item -> Text("Item $item") }
}