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yattee/Shared/Videos/VerticalCells.swift

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Swift
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import Defaults
import SwiftUI
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struct VerticalCells<Header: View>: View {
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#if os(iOS)
@Environment(\.verticalSizeClass) private var verticalSizeClass
#endif
@Environment(\.loadMoreContentHandler) private var loadMoreContentHandler
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@Environment(\.listingStyle) private var listingStyle
var items = [ContentItem]()
var allowEmpty = false
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var edgesIgnoringSafeArea = Edge.Set.horizontal
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let header: Header?
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@State private var gridSize = CGSize.zero
init(
items: [ContentItem],
allowEmpty: Bool = false,
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edgesIgnoringSafeArea: Edge.Set = .horizontal,
@ViewBuilder header: @escaping () -> Header? = { nil }
) {
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self.items = items
self.allowEmpty = allowEmpty
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self.edgesIgnoringSafeArea = edgesIgnoringSafeArea
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self.header = header()
}
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init(
items: [ContentItem],
allowEmpty: Bool = false
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) where Header == EmptyView {
self.init(items: items, allowEmpty: allowEmpty) { EmptyView() }
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}
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var body: some View {
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ScrollView(.vertical, showsIndicators: scrollViewShowsIndicators) {
LazyVGrid(columns: adaptiveItem, alignment: .center) {
Section(header: header) {
ForEach(contentItems) { item in
ContentItemView(item: item)
.onAppear { loadMoreContentItemsIfNeeded(current: item) }
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}
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}
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}
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.padding()
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}
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.animation(nil)
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.edgesIgnoringSafeArea(edgesIgnoringSafeArea)
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#if os(macOS)
.background(Color.secondaryBackground)
.frame(minWidth: Constants.contentViewMinWidth)
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#endif
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}
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var contentItems: [ContentItem] {
items.isEmpty ? (allowEmpty ? items : ContentItem.placeholders) : items.sorted { $0 < $1 }
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}
func loadMoreContentItemsIfNeeded(current item: ContentItem) {
let thresholdIndex = items.index(items.endIndex, offsetBy: -5)
if items.firstIndex(where: { $0.id == item.id }) == thresholdIndex {
loadMoreContentHandler()
}
}
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var adaptiveItem: [GridItem] {
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if listingStyle == .list {
return [.init(.flexible())]
}
return [GridItem(.adaptive(minimum: adaptiveGridItemMinimumSize, maximum: adaptiveGridItemMaximumSize))]
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}
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var adaptiveGridItemMinimumSize: Double {
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#if os(iOS)
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return verticalSizeClass == .regular ? 320 : 800
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#elseif os(tvOS)
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return 600
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#else
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return 320
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#endif
}
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var adaptiveGridItemMaximumSize: Double {
#if os(tvOS)
return 600
#else
return .infinity
#endif
}
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var scrollViewShowsIndicators: Bool {
#if !os(tvOS)
true
#else
false
#endif
}
}
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struct VeticalCells_Previews: PreviewProvider {
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static var previews: some View {
VerticalCells(items: ContentItem.array(of: Array(repeating: Video.fixture, count: 30)))
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.injectFixtureEnvironmentObjects()
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}
}