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yattee/Shared/Videos/VerticalCells.swift

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2.6 KiB
Swift
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import Defaults
import SwiftUI
struct VerticalCells: View {
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#if os(iOS)
@Environment(\.verticalSizeClass) private var verticalSizeClass
#endif
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@Environment(\.scrollViewBottomPadding) private var scrollViewBottomPadding
@Environment(\.loadMoreContentHandler) private var loadMoreContentHandler
var items = [ContentItem]()
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var allowEmpty = false
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var body: some View {
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ScrollView(.vertical, showsIndicators: scrollViewShowsIndicators) {
LazyVGrid(columns: columns, alignment: .center) {
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ForEach(contentItems) { item in
ContentItemView(item: item)
.onAppear { loadMoreContentItemsIfNeeded(current: item) }
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}
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}
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.padding()
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#if !os(tvOS)
Color.clear.padding(.bottom, scrollViewBottomPadding)
#endif
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}
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.edgesIgnoringSafeArea(.horizontal)
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#if os(macOS)
.background(Color.secondaryBackground)
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.frame(minWidth: 360)
#endif
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}
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var contentItems: [ContentItem] {
items.isEmpty ? (allowEmpty ? items : placeholders) : items.sorted { $0 < $1 }
}
var placeholders: [ContentItem] {
(0 ..< 9).map { _ in .init() }
}
func loadMoreContentItemsIfNeeded(current item: ContentItem) {
let thresholdIndex = items.index(items.endIndex, offsetBy: -5)
if items.firstIndex(where: { $0.id == item.id }) == thresholdIndex {
loadMoreContentHandler()
}
}
var columns: [GridItem] {
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#if os(tvOS)
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contentItems.count < 3 ? Array(repeating: GridItem(.fixed(500)), count: [contentItems.count, 1].max()!) : adaptiveItem
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#else
adaptiveItem
#endif
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}
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var adaptiveItem: [GridItem] {
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[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 {
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VerticalCells(items: ContentItem.array(of: Array(repeating: Video.fixture, count: 30)))
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.injectFixtureEnvironmentObjects()
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}
}