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Pods/Kingfisher/Sources/SwiftUI/KFImageProtocol.swift

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+//
+//  KFImageProtocol.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, *)
+public protocol KFImageProtocol: View, KFOptionSetter {
+    associatedtype HoldingView: KFImageHoldingView
+    var context: KFImage.Context<HoldingView> { get set }
+    init(context: KFImage.Context<HoldingView>)
+}
+
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension KFImageProtocol {
+    public var body: some View {
+        ZStack {
+            KFImageRenderer<HoldingView>(
+                context: context
+            ).id(context)
+        }
+    }
+    
+    /// Creates a Kingfisher compatible image view to load image from the given `Source`.
+    /// - Parameters:
+    ///   - source: The image `Source` defining where to load the target image.
+    public init(source: Source?) {
+        let context = KFImage.Context<HoldingView>(source: source)
+        self.init(context: context)
+    }
+
+    /// Creates a Kingfisher compatible image view to load image from the given `URL`.
+    /// - Parameters:
+    ///   - source: The image `Source` defining where to load the target image.
+    public init(_ url: URL?) {
+        self.init(source: url?.convertToSource())
+    }
+    
+    /// Configures current image with a `block` and return another `Image` to use as the final content.
+    ///
+    /// This block will be lazily applied when creating the final `Image`.
+    ///
+    /// If multiple `configure` modifiers are added to the image, they will be evaluated by order. If you want to
+    /// configure the input image (which is usually an `Image` value) to a non-`Image` value, use `contentConfigure`.
+    ///
+    /// - Parameter block: The block applies to loaded image. The block should return an `Image` that is configured.
+    /// - Returns: A `KFImage` view that configures internal `Image` with `block`.
+    public func configure(_ block: @escaping (HoldingView) -> HoldingView) -> Self {
+        context.configurations.append(block)
+        return self
+    }
+
+    /// Configures current image with a `block` and return a `View` to use as the final content.
+    ///
+    /// This block will be lazily applied when creating the final `Image`.
+    ///
+    /// If multiple `contentConfigure` modifiers are added to the image, only the last one will be stored and used.
+    ///
+    /// - Parameter block: The block applies to the loaded image. The block should return a `View` that is configured.
+    /// - Returns: A `KFImage` view that configures internal `Image` with `block`.
+    public func contentConfigure<V: View>(_ block: @escaping (HoldingView) -> V) -> Self {
+        context.contentConfiguration = { AnyView(block($0)) }
+        return self
+    }
+}
+
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+public protocol KFImageHoldingView: View {
+    associatedtype RenderingView
+    static func created(from image: KFCrossPlatformImage?, context: KFImage.Context<Self>) -> Self
+}
+
+@available(iOS 14.0, macOS 11.0, tvOS 14.0, watchOS 7.0, *)
+extension KFImageProtocol {
+    public var options: KingfisherParsedOptionsInfo {
+        get { context.options }
+        nonmutating set { context.options = newValue }
+    }
+
+    public var onFailureDelegate: Delegate<KingfisherError, Void> { context.onFailureDelegate }
+    public var onSuccessDelegate: Delegate<RetrieveImageResult, Void> { context.onSuccessDelegate }
+    public var onProgressDelegate: Delegate<(Int64, Int64), Void> { context.onProgressDelegate }
+
+    public var delegateObserver: AnyObject { context }
+}
+
+
+#endif