80 lines
2.6 KiB
Swift
80 lines
2.6 KiB
Swift
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import SwiftUI
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struct CachedCapImage<Content, T>: View where Content: View, T: Equatable {
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@State private var phase: AsyncImagePhase
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let id: T
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let check: () -> UIImage?
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let fetch: () async -> UIImage?
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private let transaction: Transaction
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private let content: (AsyncImagePhase) -> Content
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var body: some View {
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content(phase)
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.task(id: id, load)
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}
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init<I, P>(_ id: T, _ image: CapImage, cache: ImageCache, @ViewBuilder content: @escaping (Image) -> I, @ViewBuilder placeholder: @escaping () -> P) where Content == _ConditionalContent<I, P>, I : View, P : View {
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self.init(id, image: image, cache: cache) { phase in
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if let image = phase.image {
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content(image)
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} else {
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placeholder()
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}
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}
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}
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init(_ id: T, image: CapImage, cache: ImageCache, transaction: Transaction = Transaction(), @ViewBuilder content: @escaping (AsyncImagePhase) -> Content) {
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self.init(id,
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check: { cache.cachedImage(image) },
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fetch: { await cache.image(image) },
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transaction: transaction,
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content: content)
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}
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init<I, P>(_ id: T, check: @escaping () -> UIImage?, fetch: @escaping () async -> UIImage?, @ViewBuilder content: @escaping (Image) -> I, @ViewBuilder placeholder: @escaping () -> P) where Content == _ConditionalContent<I, P>, I : View, P : View {
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self.init(id, check: check, fetch: fetch) { phase in
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if let image = phase.image {
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content(image)
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} else {
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placeholder()
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}
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}
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}
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init(_ id: T, check: @escaping () -> UIImage?, fetch: @escaping () async -> UIImage?, transaction: Transaction = Transaction(), @ViewBuilder content: @escaping (AsyncImagePhase) -> Content) {
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self.id = id
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self.check = check
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self.fetch = fetch
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self.transaction = transaction
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self.content = content
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self._phase = State(wrappedValue: .empty)
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guard let image = check() else {
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return
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}
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let wrapped = Image(uiImage: image)
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self._phase = State(wrappedValue: .success(wrapped))
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}
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@Sendable
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private func load() async {
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guard let image = await fetch() else {
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withAnimation(transaction.animation) {
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phase = .empty
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}
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return
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}
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let wrapped = Image(uiImage: image)
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withAnimation(transaction.animation) {
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phase = .success(wrapped)
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}
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}
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}
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