104 lines
2.9 KiB
Swift
104 lines
2.9 KiB
Swift
//
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// CachedImageView.swift
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// Tusker
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//
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// Created by Shadowfacts on 10/4/22.
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// Copyright © 2022 Shadowfacts. All rights reserved.
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//
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import UIKit
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class CachedImageView: UIImageView {
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var cache: ImageCache!
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private var url: URL?
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private var isGrayscale = false
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private var fetchTask: Task<Void, Error>?
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private var blurHashTask: DispatchWorkItem?
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override var image: UIImage? {
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didSet {
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blurHashTask?.cancel()
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}
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}
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init(cache: ImageCache) {
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self.cache = cache
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super.init(frame: .zero)
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commonInit()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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commonInit()
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}
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private func commonInit() {
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NotificationCenter.default.addObserver(self, selector: #selector(preferencesChanged), name: .preferencesChanged, object: nil)
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}
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func update(for url: URL?, blurhash: String? = nil, placeholder: UIImage? = nil) {
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if url != self.url || (url != nil && self.image == nil) {
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self.url = url
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super.image = placeholder
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updateBlurhash(blurhash, for: url)
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updateImage()
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}
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}
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func showOnlyBlurHash(_ blurhash: String, for url: URL) {
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if url != self.url {
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self.url = url
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updateBlurhash(blurhash, for: url)
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}
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}
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@objc private func preferencesChanged() {
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if isGrayscale != Preferences.shared.grayscaleImages {
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updateImage()
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}
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}
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private func updateBlurhash(_ blurhash: String?, for url: URL?) {
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blurHashTask?.cancel()
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if let blurhash {
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let aspectRatio = self.bounds.width > 0 ? self.bounds.height / self.bounds.width : 1
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blurHashTask = DispatchWorkItem {
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let size = CGSize(width: 60, height: aspectRatio * 60)
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let image = UIImage(blurHash: blurhash, size: size)
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DispatchQueue.main.async {
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if self.image == nil && self.url == url && self.blurHashTask?.isCancelled == false {
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self.image = image
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}
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}
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}
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AttachmentView.queue.async(execute: blurHashTask!)
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}
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}
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private func updateImage() {
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fetchTask?.cancel()
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guard let url else {
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return
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}
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fetchTask = Task(priority: .high) {
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let (_, image) = await cache.get(url)
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guard let image else {
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return
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}
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try Task.checkCancellation()
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guard let transformedImage = await ImageGrayscalifier.convertIfNecessary(url: url, image: image) else {
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return
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}
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try Task.checkCancellation()
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super.image = transformedImage
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self.isGrayscale = Preferences.shared.grayscaleImages
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self.blurHashTask?.cancel()
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}
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}
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}
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