ShoMasegi

private func layoutItems(...) {

    ....

    let layoutAttributes = UICollectionViewLayoutAttributes(forCellWith: indexPath)
    layoutAttributes.frame = CGRect(
        x: offsetX,
        y: offsetY,
        width: itemWidth,
        height: itemHeight

ShoMasegi

override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
    return allItemAttributes.filter { rect.intersects($0.frame) }
}

ShoMasegi

override func prepare() {
    super.prepare()
    guard let collectionView = collectionView, let delegate = delegate else {
        return
    }
    guard collectionView.numberOfSections > 0 else { return }

    var position: CGFloat = 0.0
    (0 ..< numberOfSections).forEach { section in
        layoutHeader(position: &position, collectionView: collectionView, delegate: delegate, section: section)

ShoMasegi

weak var delegate: CollectionViewLayoutDelegate?
private var allItemAttributes = [UICollectionViewLayoutAttributes]()
private var columnOffsetsY = [[CGFloat]]()
....

ShoMasegi

carousel {
    id("carousel")
    numViewsToShowOnScreen(1.05f)
    padding(Carousel.Padding.dp(20, 24))
    withModelsFrom(items) {
        HomeItemBindingModel_()
            .id(it.id)
            .title(it.title)
            .username(it.username)
    }

ShoMasegi

modelView {
    id("header view")
    onVisibilityStateChanged { model, view, visibilityState ->
       // Do something with the new visibility state
    } 
    onVisibilityChanged { model, view, percentVisibleHeight, percentVisibleWidth, visibleHeight, visibleWidth ,view -> 
       // Do something with the visibility information
    }
}

ShoMasegi

headerView {
    id("header view")
    cityName(data.name)
    description(data.description)
    ...
}

ShoMasegi

inline fun EpoxyController.carousel(modelInitializer: CarouselModelBuilder.() -> Unit) {
    CarouselModel_().apply {
        modelInitializer()
    }.addTo(this)
}

inline fun <T> CarouselModelBuilder.withModelsFrom(
    items: List<T>,
    modelBuilder: (T) -> EpoxyModel<*>
) {

ShoMasegi

class MainController internal constructor(): TypedEpoxyController<City>() {

    interface Delegate {
        fun onLinkClick(view: View) {}
        fun onHeaderViewVisibilityChanged(percentVisibleHeight: Float) {}
    }
    var delegate: Delegate? = null

    override fun buildModels(data: City?) {
        data ?: return

ShoMasegi

<?xml version="1.0" encoding="utf-8"?>
<layout ...>
    <data>
        <variable
            name="cityName"
            type="String" />
        <variable
            name="description"
            type="String" />
    </data>