mastodon-ios/Mastodon/Scene/Compose/TableViewCell/ComposeStatusAttachmentTabl...

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Swift
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2021-06-29 10:41:58 +02:00
//
// ComposeStatusAttachmentTableViewCell.swift
// Mastodon
//
// Created by MainasuK Cirno on 2021-6-29.
//
import UIKit
import Combine
import AlamofireImage
final class ComposeStatusAttachmentTableViewCell: UITableViewCell {
private(set) var dataSource: UICollectionViewDiffableDataSource<ComposeStatusAttachmentSection, ComposeStatusAttachmentItem>!
weak var composeStatusAttachmentCollectionViewCellDelegate: ComposeStatusAttachmentCollectionViewCellDelegate?
var observations = Set<NSKeyValueObservation>()
private static func createLayout() -> UICollectionViewLayout {
let itemSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(44))
let item = NSCollectionLayoutItem(layoutSize: itemSize)
let groupSize = NSCollectionLayoutSize(widthDimension: .fractionalWidth(1.0), heightDimension: .estimated(44))
let group = NSCollectionLayoutGroup.vertical(layoutSize: groupSize, subitems: [item])
let section = NSCollectionLayoutSection(group: group)
section.contentInsetsReference = .readableContent
return UICollectionViewCompositionalLayout(section: section)
}
private(set) var collectionViewHeightLayoutConstraint: NSLayoutConstraint!
let collectionView: UICollectionView = {
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let collectionViewLayout = ComposeStatusAttachmentTableViewCell.createLayout()
let collectionView = UICollectionView(frame: .zero, collectionViewLayout: collectionViewLayout)
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collectionView.register(ComposeStatusAttachmentCollectionViewCell.self, forCellWithReuseIdentifier: String(describing: ComposeStatusAttachmentCollectionViewCell.self))
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collectionView.backgroundColor = .clear
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collectionView.alwaysBounceVertical = true
collectionView.isScrollEnabled = false
return collectionView
}()
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let collectionViewHeightDidUpdate = PassthroughSubject<Void, Never>()
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override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
_init()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
_init()
}
}
extension ComposeStatusAttachmentTableViewCell {
private func _init() {
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backgroundColor = .clear
contentView.backgroundColor = .clear
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collectionView.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(collectionView)
collectionViewHeightLayoutConstraint = collectionView.heightAnchor.constraint(equalToConstant: 200).priority(.defaultHigh)
NSLayoutConstraint.activate([
collectionView.topAnchor.constraint(equalTo: contentView.topAnchor),
collectionView.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
collectionView.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
collectionView.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
collectionViewHeightLayoutConstraint,
])
collectionView.observe(\.contentSize, options: [.initial, .new]) { [weak self] collectionView, _ in
guard let self = self else { return }
self.collectionViewHeightLayoutConstraint.constant = collectionView.contentSize.height
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self.collectionViewHeightDidUpdate.send()
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}
.store(in: &observations)
self.dataSource = UICollectionViewDiffableDataSource(collectionView: collectionView) { [
weak self
] collectionView, indexPath, item -> UICollectionViewCell? in
guard let self = self else { return UICollectionViewCell() }
switch item {
case .attachment(let attachmentService):
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: String(describing: ComposeStatusAttachmentCollectionViewCell.self), for: indexPath) as! ComposeStatusAttachmentCollectionViewCell
cell.attachmentContainerView.descriptionTextView.text = attachmentService.description.value
cell.delegate = self.composeStatusAttachmentCollectionViewCellDelegate
attachmentService.thumbnailImage
.receive(on: DispatchQueue.main)
.sink { [weak cell] thumbnailImage in
guard let cell = cell else { return }
let size = cell.attachmentContainerView.previewImageView.frame.size != .zero ? cell.attachmentContainerView.previewImageView.frame.size : CGSize(width: 1, height: 1)
guard let image = thumbnailImage else {
let placeholder = UIImage.placeholder(
size: size,
color: ThemeService.shared.currentTheme.value.systemGroupedBackgroundColor
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)
.af.imageRounded(
withCornerRadius: AttachmentContainerView.containerViewCornerRadius
)
cell.attachmentContainerView.previewImageView.image = placeholder
return
}
// cannot get correct size. set corner radius on layer
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cell.attachmentContainerView.previewImageView.image = image
}
.store(in: &cell.disposeBag)
Publishers.CombineLatest(
attachmentService.uploadStateMachineSubject.eraseToAnyPublisher(),
attachmentService.error.eraseToAnyPublisher()
)
.receive(on: DispatchQueue.main)
.sink { [weak cell, weak attachmentService] uploadState, error in
guard let cell = cell else { return }
guard let attachmentService = attachmentService else { return }
cell.attachmentContainerView.emptyStateView.isHidden = error == nil
cell.attachmentContainerView.descriptionBackgroundView.isHidden = error != nil
if let error = error {
cell.attachmentContainerView.activityIndicatorView.stopAnimating()
cell.attachmentContainerView.emptyStateView.label.text = error.localizedDescription
} else {
guard let uploadState = uploadState else { return }
switch uploadState {
case is MastodonAttachmentService.UploadState.Finish:
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cell.attachmentContainerView.activityIndicatorView.stopAnimating()
case is MastodonAttachmentService.UploadState.Fail:
cell.attachmentContainerView.activityIndicatorView.stopAnimating()
// FIXME: not display
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cell.attachmentContainerView.emptyStateView.label.text = {
if let file = attachmentService.file.value {
switch file {
case .jpeg, .png, .gif:
return L10n.Scene.Compose.Attachment.attachmentBroken(L10n.Scene.Compose.Attachment.photo)
case .other:
return L10n.Scene.Compose.Attachment.attachmentBroken(L10n.Scene.Compose.Attachment.video)
}
} else {
return L10n.Scene.Compose.Attachment.attachmentBroken(L10n.Scene.Compose.Attachment.photo)
}
}()
default:
break
}
}
}
.store(in: &cell.disposeBag)
NotificationCenter.default.publisher(
for: UITextView.textDidChangeNotification,
object: cell.attachmentContainerView.descriptionTextView
)
.receive(on: DispatchQueue.main)
.sink { notification in
guard let textField = notification.object as? UITextView else { return }
let text = textField.text?.trimmingCharacters(in: .whitespacesAndNewlines)
attachmentService.description.value = text
}
.store(in: &cell.disposeBag)
return cell
}
}
}
}