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+//
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+// NSTextAttachment+Kingfisher.swift
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+// Kingfisher
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+//
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+// Created by Benjamin Briggs on 22/07/2019.
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+//
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+// Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
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+//
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+// Permission is hereby granted, free of charge, to any person obtaining a copy
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+// of this software and associated documentation files (the "Software"), to deal
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+// in the Software without restriction, including without limitation the rights
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+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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+// copies of the Software, and to permit persons to whom the Software is
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+// furnished to do so, subject to the following conditions:
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+//
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+// The above copyright notice and this permission notice shall be included in
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+// all copies or substantial portions of the Software.
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+//
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+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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+// THE SOFTWARE.
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+
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+
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+#if os(macOS)
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+import AppKit
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+#else
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+import UIKit
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+#endif
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+
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+extension KingfisherWrapper where Base: NSTextAttachment {
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+
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+ // MARK: Setting Image
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+
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+ /// Sets an image to the image view with a source.
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+ ///
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+ /// - Parameters:
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+ /// - source: The `Source` object contains information about the image.
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+ /// - placeholder: A placeholder to show while retrieving the image from the given `resource`.
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+ /// - options: An options set to define image setting behaviors. See `KingfisherOptionsInfo` for more.
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+ /// - progressBlock: Called when the image downloading progress gets updated. If the response does not contain an
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+ /// `expectedContentLength`, this block will not be called.
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+ /// - completionHandler: Called when the image retrieved and set finished.
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+ /// - Returns: A task represents the image downloading.
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+ ///
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+ /// - Note:
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+ ///
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+ /// Internally, this method will use `KingfisherManager` to get the requested source
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+ /// Since this method will perform UI changes, you must call it from the main thread.
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+ /// Both `progressBlock` and `completionHandler` will be also executed in the main thread.
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+ ///
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+ @discardableResult
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+ public func setImage(
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+ with source: Source?,
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+ placeholder: Image? = nil,
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+ options: KingfisherOptionsInfo? = nil,
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+ progressBlock: DownloadProgressBlock? = nil,
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+ completionHandler: ((Result<RetrieveImageResult, KingfisherError>) -> Void)? = nil) -> DownloadTask?
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+ {
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+ var mutatingSelf = self
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+ guard let source = source else {
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+ base.image = placeholder
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+ mutatingSelf.taskIdentifier = nil
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+ completionHandler?(.failure(KingfisherError.imageSettingError(reason: .emptySource)))
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+ return nil
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+ }
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+
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+ var options = KingfisherParsedOptionsInfo(KingfisherManager.shared.defaultOptions + (options ?? .empty))
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+ if !options.keepCurrentImageWhileLoading {
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+ base.image = placeholder
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+ }
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+
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+ let issuedIdentifier = Source.Identifier.next()
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+ mutatingSelf.taskIdentifier = issuedIdentifier
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+
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+ if let block = progressBlock {
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+ options.onDataReceived = (options.onDataReceived ?? []) + [ImageLoadingProgressSideEffect(block)]
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+ }
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+
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+ if let provider = ImageProgressiveProvider(options, refresh: { image in
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+ self.base.image = image
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+ }) {
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+ options.onDataReceived = (options.onDataReceived ?? []) + [provider]
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+ }
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+
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+ options.onDataReceived?.forEach {
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+ $0.onShouldApply = { issuedIdentifier == self.taskIdentifier }
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+ }
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+
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+ let task = KingfisherManager.shared.retrieveImage(
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+ with: source,
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+ options: options,
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+ completionHandler: { result in
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+ CallbackQueue.mainCurrentOrAsync.execute {
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+ guard issuedIdentifier == self.taskIdentifier else {
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+ let reason: KingfisherError.ImageSettingErrorReason
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+ do {
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+ let value = try result.get()
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+ reason = .notCurrentSourceTask(result: value, error: nil, source: source)
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+ } catch {
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+ reason = .notCurrentSourceTask(result: nil, error: error, source: source)
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+ }
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+ let error = KingfisherError.imageSettingError(reason: reason)
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+ completionHandler?(.failure(error))
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+ return
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+ }
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+
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+ mutatingSelf.imageTask = nil
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+ mutatingSelf.taskIdentifier = nil
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+
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+ switch result {
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+ case .success(let value):
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+ self.base.image = value.image
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+ completionHandler?(result)
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+
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+ case .failure:
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+ if let image = options.onFailureImage {
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+ self.base.image = image
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+ }
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+ completionHandler?(result)
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+ }
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+ }
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+ }
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+ )
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+
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+ mutatingSelf.imageTask = task
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+ return task
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+ }
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+
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+ /// Sets an image to the image view with a requested resource.
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+ ///
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+ /// - Parameters:
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+ /// - resource: The `Resource` object contains information about the image.
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+ /// - placeholder: A placeholder to show while retrieving the image from the given `resource`.
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+ /// - options: An options set to define image setting behaviors. See `KingfisherOptionsInfo` for more.
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+ /// - progressBlock: Called when the image downloading progress gets updated. If the response does not contain an
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+ /// `expectedContentLength`, this block will not be called.
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+ /// - completionHandler: Called when the image retrieved and set finished.
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+ /// - Returns: A task represents the image downloading.
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+ ///
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+ /// - Note:
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+ ///
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+ /// Internally, this method will use `KingfisherManager` to get the requested resource, from either cache
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+ /// or network. Since this method will perform UI changes, you must call it from the main thread.
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+ /// Both `progressBlock` and `completionHandler` will be also executed in the main thread.
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+ ///
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+ @discardableResult
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+ public func setImage(
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+ with resource: Resource?,
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+ placeholder: Image? = nil,
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+ options: KingfisherOptionsInfo? = nil,
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+ progressBlock: DownloadProgressBlock? = nil,
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+ completionHandler: ((Result<RetrieveImageResult, KingfisherError>) -> Void)? = nil) -> DownloadTask?
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+ {
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+ return setImage(
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+ with: resource.map { .network($0) },
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+ placeholder: placeholder,
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+ options: options,
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+ progressBlock: progressBlock,
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+ completionHandler: completionHandler)
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+ }
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+
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+ // MARK: Cancelling Image
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+
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+ /// Cancel the image download task bounded to the image view if it is running.
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+ /// Nothing will happen if the downloading has already finished.
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+ public func cancelDownloadTask() {
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+ imageTask?.cancel()
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+ }
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+}
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+
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+private var taskIdentifierKey: Void?
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+private var imageTaskKey: Void?
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+
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+// MARK: Properties
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+extension KingfisherWrapper where Base: NSTextAttachment {
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+
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+ public private(set) var taskIdentifier: Source.Identifier.Value? {
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+ get {
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+ let box: Box<Source.Identifier.Value>? = getAssociatedObject(base, &taskIdentifierKey)
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+ return box?.value
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+ }
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+ set {
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+ let box = newValue.map { Box($0) }
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+ setRetainedAssociatedObject(base, &taskIdentifierKey, box)
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+ }
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+ }
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+
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+ private var imageTask: DownloadTask? {
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+ get { return getAssociatedObject(base, &imageTaskKey) }
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+ set { setRetainedAssociatedObject(base, &imageTaskKey, newValue)}
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+ }
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+}
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+
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+extension KingfisherWrapper where Base: NSTextAttachment {
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+ /// Gets the image URL bound to this image view.
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+ @available(*, deprecated, message: "Use `taskIdentifier` instead to identify a setting task.")
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+ public private(set) var webURL: URL? {
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+ get { return nil }
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+ set { }
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+ }
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+}
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Benjamin Briggs