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95 lines
2.6 KiB
Swift
95 lines
2.6 KiB
Swift
import Defaults
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import SwiftUI
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struct VerticalCells: View {
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#if os(iOS)
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@Environment(\.verticalSizeClass) private var verticalSizeClass
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#endif
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@Environment(\.scrollViewBottomPadding) private var scrollViewBottomPadding
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@Environment(\.loadMoreContentHandler) private var loadMoreContentHandler
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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) {
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LazyVGrid(columns: columns, alignment: .center) {
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ForEach(contentItems) { item in
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ContentItemView(item: item)
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.onAppear { loadMoreContentItemsIfNeeded(current: item) }
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}
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}
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.padding()
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#if !os(tvOS)
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Color.clear.padding(.bottom, scrollViewBottomPadding)
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#endif
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}
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.edgesIgnoringSafeArea(.horizontal)
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#if os(macOS)
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.background(Color.secondaryBackground)
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.frame(minWidth: 360)
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#endif
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}
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var contentItems: [ContentItem] {
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items.isEmpty ? (allowEmpty ? items : placeholders) : items.sorted { $0 < $1 }
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}
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var placeholders: [ContentItem] {
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(0 ..< 9).map { _ in .init() }
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}
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func loadMoreContentItemsIfNeeded(current item: ContentItem) {
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let thresholdIndex = items.index(items.endIndex, offsetBy: -5)
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if items.firstIndex(where: { $0.id == item.id }) == thresholdIndex {
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loadMoreContentHandler()
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}
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}
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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
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adaptiveItem
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#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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}
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var adaptiveGridItemMaximumSize: Double {
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#if os(tvOS)
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return 600
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#else
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return .infinity
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#endif
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}
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var scrollViewShowsIndicators: Bool {
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#if !os(tvOS)
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true
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#else
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false
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#endif
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}
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}
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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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}
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}
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