89 lines
4.0 KiB
Swift
89 lines
4.0 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 Apache License 2.0.
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//
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import SwiftUI
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import PixelfedKit
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struct ImageRowAsync: View {
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private let statusViewModel: StatusModel
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private let firstAttachment: AttachmentModel?
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@State private var selected: String
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@State private var imageHeight: Double
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@State private var imageWidth: Double
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init(statusViewModel: StatusModel) {
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self.statusViewModel = statusViewModel
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self.firstAttachment = statusViewModel.mediaAttachments.first
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self.selected = String.empty()
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// Calculate size of frame (first from cache, then from metadata).
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if let firstAttachment, let size = ImageSizeService.shared.get(for: firstAttachment.url) {
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self.imageWidth = size.width
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self.imageHeight = size.height
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} else if let firstAttachment,
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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 size = ImageSizeService.shared.calculate(for: firstAttachment.url, width: imgWidth, height: imgHeight)
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self.imageWidth = size.width
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self.imageHeight = size.height
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} else {
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self.imageWidth = UIScreen.main.bounds.width
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self.imageHeight = UIScreen.main.bounds.width
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}
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}
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var body: some View {
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if statusViewModel.mediaAttachments.count == 1, let firstAttachment = self.firstAttachment {
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ImageRowItemAsync(statusViewModel: self.statusViewModel, attachment: firstAttachment) { (imageWidth, imageHeight) in
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// When we download image and calculate real size we have to change view size.
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if imageWidth != self.imageWidth || imageHeight != self.imageHeight {
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withAnimation(.linear(duration: 0.4)) {
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self.imageWidth = imageWidth
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self.imageHeight = imageHeight
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}
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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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TabView(selection: $selected) {
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ForEach(statusViewModel.mediaAttachments, id: \.id) { attachment in
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ImageRowItemAsync(statusViewModel: self.statusViewModel, attachment: attachment) { (imageWidth, imageHeight) in
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// When we download image and calculate real size we have to change view size (only when image is now visible).
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if attachment.id == self.selected {
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if imageWidth != self.imageWidth || imageHeight != self.imageHeight {
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withAnimation(.linear(duration: 0.4)) {
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self.imageWidth = imageWidth
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self.imageHeight = imageHeight
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}
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}
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}
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}
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.tag(attachment.id)
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}
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}
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.onFirstAppear {
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self.selected = self.statusViewModel.mediaAttachments.first?.id ?? String.empty()
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}
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.onChange(of: selected, perform: { attachmentId in
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if let attachment = self.statusViewModel.mediaAttachments.first(where: { item in item.id == attachmentId }) {
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if let size = ImageSizeService.shared.get(for: attachment.url) {
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if size.width != self.imageWidth || size.height != self.imageHeight {
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withAnimation(.linear(duration: 0.4)) {
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self.imageWidth = size.width
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self.imageHeight = size.height
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}
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}
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}
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}
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})
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.frame(width: self.imageWidth, height: self.imageHeight)
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.tabViewStyle(PageTabViewStyle())
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}
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}
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}
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