yattee/Shared/Videos/VerticalCells.swift
2023-05-21 19:13:42 +02:00

104 lines
3.2 KiB
Swift

import Defaults
import SwiftUI
struct VerticalCells<Header: View>: View {
#if os(iOS)
@Environment(\.verticalSizeClass) private var verticalSizeClass
#endif
@Environment(\.scrollViewBottomPadding) private var scrollViewBottomPadding
@Environment(\.loadMoreContentHandler) private var loadMoreContentHandler
@Environment(\.listingStyle) private var listingStyle
var items = [ContentItem]()
var allowEmpty = false
var edgesIgnoringSafeArea = Edge.Set.horizontal
let header: Header?
init(items: [ContentItem], allowEmpty: Bool = false, edgesIgnoringSafeArea: Edge.Set = .horizontal, @ViewBuilder header: @escaping () -> Header? = { nil }) {
self.items = items
self.allowEmpty = allowEmpty
self.edgesIgnoringSafeArea = edgesIgnoringSafeArea
self.header = header()
}
init(items: [ContentItem], allowEmpty: Bool = false) where Header == EmptyView {
self.init(items: items, allowEmpty: allowEmpty) { EmptyView() }
}
var body: some View {
ScrollView(.vertical, showsIndicators: scrollViewShowsIndicators) {
LazyVGrid(columns: adaptiveItem, alignment: .center) {
Section(header: header) {
ForEach(contentItems) { item in
ContentItemView(item: item)
.onAppear { loadMoreContentItemsIfNeeded(current: item) }
}
}
}
.padding()
#if !os(tvOS)
Color.clear.padding(.bottom, scrollViewBottomPadding)
#endif
}
.animation(nil)
.edgesIgnoringSafeArea(edgesIgnoringSafeArea)
#if os(macOS)
.background(Color.secondaryBackground)
.frame(minWidth: 360)
#endif
}
var contentItems: [ContentItem] {
items.isEmpty ? (allowEmpty ? items : ContentItem.placeholders) : items.sorted { $0 < $1 }
}
func loadMoreContentItemsIfNeeded(current item: ContentItem) {
let thresholdIndex = items.index(items.endIndex, offsetBy: -5)
if items.firstIndex(where: { $0.id == item.id }) == thresholdIndex {
loadMoreContentHandler()
}
}
var adaptiveItem: [GridItem] {
if listingStyle == .list {
return [.init(.flexible())]
}
return [GridItem(.adaptive(minimum: adaptiveGridItemMinimumSize, maximum: adaptiveGridItemMaximumSize))]
}
var adaptiveGridItemMinimumSize: Double {
#if os(iOS)
return verticalSizeClass == .regular ? 320 : 800
#elseif os(tvOS)
return 600
#else
return 320
#endif
}
var adaptiveGridItemMaximumSize: Double {
#if os(tvOS)
return 600
#else
return .infinity
#endif
}
var scrollViewShowsIndicators: Bool {
#if !os(tvOS)
true
#else
false
#endif
}
}
struct VeticalCells_Previews: PreviewProvider {
static var previews: some View {
VerticalCells(items: ContentItem.array(of: Array(repeating: Video.fixture, count: 30)))
.injectFixtureEnvironmentObjects()
}
}