107 lines
4.2 KiB
Swift
107 lines
4.2 KiB
Swift
//
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// https://mczachurski.dev
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// Copyright © 2023 Marcin Czachurski and the repository contributors.
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// Licensed under the MIT License.
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//
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import SwiftUI
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import MastodonSwift
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import NukeUI
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struct ImageRowAsync: View {
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@State public var attachments: [Attachment]
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@State private var imageHeight = UIScreen.main.bounds.width
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@State private var imageWidth = UIScreen.main.bounds.width
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@State private var heightWasPrecalculated = true
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var body: some View {
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if let attachment = attachments.first {
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ZStack {
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LazyImage(url: attachment.url) { state in
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if let image = state.image {
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image
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} else if state.error != nil {
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ZStack {
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Rectangle()
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.fill(Color.placeholderText)
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.scaledToFill()
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VStack(alignment: .center) {
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Spacer()
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Text("Cannot download image")
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.foregroundColor(.systemBackground)
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Spacer()
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}
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}
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.frame(width: self.imageWidth, height: self.imageHeight)
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} else {
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VStack(alignment: .center) {
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if let blurhash = attachment.blurhash,
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let uiImage = UIImage(blurHash: blurhash, size: CGSize(width: 32, height: 32)) {
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Image(uiImage: uiImage)
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.resizable()
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} else {
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Rectangle()
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.fill(Color.placeholderText)
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}
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}
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.frame(width: self.imageWidth, height: self.imageHeight)
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}
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}
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.onSuccess { imageResponse in
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self.recalculateSizeOfDownloadedImage(imageResponse: imageResponse)
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}
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if let count = attachments.count, count > 1 {
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BottomRight {
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Text("1 / \(count)")
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.padding(.horizontal, 6)
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.padding(.vertical, 3)
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.font(.caption2)
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.foregroundColor(.black)
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.background(.ultraThinMaterial, in: Capsule())
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}.padding()
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}
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}
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.frame(width: self.imageWidth, height: self.imageHeight)
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.onAppear {
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self.recalculateSizeFromMetadata()
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}
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} else {
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EmptyView()
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}
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}
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private func recalculateSizeOfDownloadedImage(imageResponse: ImageResponse) {
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if heightWasPrecalculated == false {
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let imgHeight = imageResponse.image.size.height
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let imgWidth = imageResponse.image.size.width
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let calculatedHeight = self.calculateHeight(width: imgWidth, height: imgHeight)
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self.imageHeight = (calculatedHeight > 0 && calculatedHeight < .infinity) ? calculatedHeight : UIScreen.main.bounds.width
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}
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}
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private func recalculateSizeFromMetadata() {
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if let firstAttachment = attachments.first,
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let imgHeight = (firstAttachment.meta as? ImageMetadata)?.original?.height,
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let imgWidth = (firstAttachment.meta as? ImageMetadata)?.original?.width {
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let calculatedHeight = self.calculateHeight(width: Double(imgWidth), height: Double(imgHeight))
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self.imageHeight = (calculatedHeight > 0 && calculatedHeight < .infinity) ? calculatedHeight : UIScreen.main.bounds.width
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} else {
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heightWasPrecalculated = false
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}
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}
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private func calculateHeight(width: Double, height: Double) -> CGFloat {
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let divider = width / UIScreen.main.bounds.size.width
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return height / divider
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}
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}
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struct ImageRowAsync_Previews: PreviewProvider {
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static var previews: some View {
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ImageRow(attachments: [])
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}
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}
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