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Pods/Kingfisher/Sources/SwiftUI/ImageContext.swift

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+//
+//  ImageContext.swift
+//  Kingfisher
+//
+//  Created by onevcat on 2021/05/08.
+//
+//  Copyright (c) 2021 Wei Wang <onevcat@gmail.com>
+//
+//  Permission is hereby granted, free of charge, to any person obtaining a copy
+//  of this software and associated documentation files (the "Software"), to deal
+//  in the Software without restriction, including without limitation the rights
+//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+//  copies of the Software, and to permit persons to whom the Software is
+//  furnished to do so, subject to the following conditions:
+//
+//  The above copyright notice and this permission notice shall be included in
+//  all copies or substantial portions of the Software.
+//
+//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+//  THE SOFTWARE.
+
+#if canImport(SwiftUI) && canImport(Combine)
+import SwiftUI
+import Combine
+
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension KFImage {
+    public class Context<HoldingView: KFImageHoldingView> {
+        let source: Source?
+        var options = KingfisherParsedOptionsInfo(
+            KingfisherManager.shared.defaultOptions + [.loadDiskFileSynchronously]
+        )
+
+        var configurations: [(HoldingView) -> HoldingView] = []
+        var renderConfigurations: [(HoldingView.RenderingView) -> Void] = []
+        var contentConfiguration: ((HoldingView) -> AnyView)? = nil
+        
+        var cancelOnDisappear: Bool = false
+        var placeholder: ((Progress) -> AnyView)? = nil
+
+        let onFailureDelegate = Delegate<KingfisherError, Void>()
+        let onSuccessDelegate = Delegate<RetrieveImageResult, Void>()
+        let onProgressDelegate = Delegate<(Int64, Int64), Void>()
+        
+        var startLoadingBeforeViewAppear: Bool = false
+        
+        init(source: Source?) {
+            self.source = source
+        }
+        
+        func shouldApplyFade(cacheType: CacheType) -> Bool {
+            options.forceTransition || cacheType == .none
+        }
+
+        func fadeTransitionDuration(cacheType: CacheType) -> TimeInterval? {
+            shouldApplyFade(cacheType: cacheType)
+            ? options.transition.fadeDuration
+                : nil
+        }
+    }
+}
+
+extension ImageTransition {
+    // Only for fade effect in SwiftUI.
+    fileprivate var fadeDuration: TimeInterval? {
+        switch self {
+        case .fade(let duration):
+            return duration
+        default:
+            return nil
+        }
+    }
+}
+
+
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension KFImage.Context: Hashable {
+    public static func == (lhs: KFImage.Context<HoldingView>, rhs: KFImage.Context<HoldingView>) -> Bool {
+        lhs.source == rhs.source &&
+        lhs.options.processor.identifier == rhs.options.processor.identifier
+    }
+
+    public func hash(into hasher: inout Hasher) {
+        hasher.combine(source)
+        hasher.combine(options.processor.identifier)
+    }
+}
+
+#if canImport(UIKit) && !os(watchOS)
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension KFAnimatedImage {
+    public typealias Context = KFImage.Context
+    typealias ImageBinder = KFImage.ImageBinder
+}
+#endif
+
+#endif