metatext/Views/UIKit/CompositionInputAccessoryView.swift

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// Copyright © 2020 Metabolist. All rights reserved.
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import AVFoundation
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import Combine
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import Mastodon
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import UIKit
import ViewModels
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final class CompositionInputAccessoryView: UIView {
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let tagForInputView = UUID().hashValue
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let autocompleteSelections: AnyPublisher<String, Never>
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private let viewModel: CompositionViewModel
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private let parentViewModel: NewStatusViewModel
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private let toolbar = UIToolbar()
private let autocompleteCollectionView = UICollectionView(
frame: .zero,
collectionViewLayout: CompositionInputAccessoryView.autocompleteLayout())
private let autocompleteDataSource: AutocompleteDataSource
private let autocompleteCollectionViewHeightConstraint: NSLayoutConstraint
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private let autocompleteSelectionsSubject = PassthroughSubject<String, Never>()
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private var cancellables = Set<AnyCancellable>()
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init(viewModel: CompositionViewModel,
parentViewModel: NewStatusViewModel,
autocompleteQueryPublisher: AnyPublisher<String?, Never>) {
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self.viewModel = viewModel
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self.parentViewModel = parentViewModel
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autocompleteDataSource = AutocompleteDataSource(
collectionView: autocompleteCollectionView,
queryPublisher: autocompleteQueryPublisher,
parentViewModel: parentViewModel)
autocompleteCollectionViewHeightConstraint =
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autocompleteCollectionView.heightAnchor.constraint(equalToConstant: .hairline)
autocompleteSelections = autocompleteSelectionsSubject.eraseToAnyPublisher()
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super.init(
frame: .init(
origin: .zero,
size: .init(width: UIScreen.main.bounds.width, height: .minimumButtonDimension)))
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initialSetup()
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
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override func didMoveToSuperview() {
super.didMoveToSuperview()
layoutIfNeeded()
}
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}
private extension CompositionInputAccessoryView {
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static let autocompleteCollectionViewMaxHeight: CGFloat = 150
var heightConstraint: NSLayoutConstraint? {
superview?.constraints.first(where: { $0.identifier == "accessoryHeight" })
}
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// swiftlint:disable:next function_body_length
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func initialSetup() {
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autoresizingMask = .flexibleHeight
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addSubview(autocompleteCollectionView)
autocompleteCollectionView.translatesAutoresizingMaskIntoConstraints = false
autocompleteCollectionView.alwaysBounceVertical = false
autocompleteCollectionView.backgroundColor = .clear
autocompleteCollectionView.layer.cornerRadius = .defaultCornerRadius
autocompleteCollectionView.layer.maskedCorners = [.layerMaxXMinYCorner, .layerMinXMinYCorner]
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autocompleteCollectionView.dataSource = autocompleteDataSource
autocompleteCollectionView.delegate = self
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let autocompleteBackgroundView = UIVisualEffectView(effect: UIBlurEffect(style: .systemChromeMaterial))
autocompleteCollectionView.backgroundView = autocompleteBackgroundView
addSubview(toolbar)
toolbar.translatesAutoresizingMaskIntoConstraints = false
toolbar.setContentCompressionResistancePriority(.required, for: .vertical)
NSLayoutConstraint.activate([
autocompleteCollectionView.leadingAnchor.constraint(equalTo: leadingAnchor),
autocompleteCollectionView.topAnchor.constraint(equalTo: topAnchor),
autocompleteCollectionView.trailingAnchor.constraint(equalTo: trailingAnchor),
autocompleteCollectionView.bottomAnchor.constraint(equalTo: toolbar.topAnchor),
toolbar.leadingAnchor.constraint(equalTo: leadingAnchor),
toolbar.trailingAnchor.constraint(equalTo: trailingAnchor),
toolbar.bottomAnchor.constraint(equalTo: bottomAnchor),
toolbar.heightAnchor.constraint(equalToConstant: .minimumButtonDimension),
autocompleteCollectionViewHeightConstraint
])
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var attachmentActions = [
UIAction(
title: NSLocalizedString("compose.browse", comment: ""),
image: UIImage(systemName: "ellipsis")) { [weak self] _ in
guard let self = self else { return }
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self.parentViewModel.presentDocumentPicker(viewModel: self.viewModel)
},
UIAction(
title: NSLocalizedString("compose.photo-library", comment: ""),
image: UIImage(systemName: "rectangle.on.rectangle")) { [weak self] _ in
guard let self = self else { return }
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self.parentViewModel.presentMediaPicker(viewModel: self.viewModel)
}
]
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#if !IS_SHARE_EXTENSION
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attachmentActions.insert(UIAction(
title: NSLocalizedString("compose.take-photo-or-video", comment: ""),
image: UIImage(systemName: "camera.fill")) { [weak self] _ in
guard let self = self else { return }
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self.parentViewModel.presentCamera(viewModel: self.viewModel)
},
at: 1)
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#endif
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let attachmentButton = UIBarButtonItem(
image: UIImage(systemName: "paperclip"),
menu: UIMenu(children: attachmentActions))
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attachmentButton.accessibilityLabel =
NSLocalizedString("compose.attachments-button.accessibility-label", comment: "")
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let pollButton = UIBarButtonItem(
image: UIImage(systemName: "chart.bar.xaxis"),
primaryAction: UIAction { [weak self] _ in self?.viewModel.displayPoll.toggle() })
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pollButton.accessibilityLabel = NSLocalizedString("compose.poll-button.accessibility-label", comment: "")
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let visibilityButton = UIBarButtonItem(
image: UIImage(systemName: parentViewModel.visibility.systemImageName),
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menu: visibilityMenu(selectedVisibility: parentViewModel.visibility))
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let contentWarningButton = UIBarButtonItem(
title: NSLocalizedString("status.content-warning-abbreviation", comment: ""),
primaryAction: UIAction { [weak self] _ in self?.viewModel.displayContentWarning.toggle() })
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viewModel.$displayContentWarning.sink {
if $0 {
contentWarningButton.accessibilityHint =
NSLocalizedString("compose.content-warning-button.remove", comment: "")
} else {
contentWarningButton.accessibilityHint =
NSLocalizedString("compose.content-warning-button.add", comment: "")
}
}
.store(in: &cancellables)
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let emojiButton = UIBarButtonItem(
image: UIImage(systemName: "face.smiling"),
primaryAction: UIAction { [weak self] _ in
guard let self = self else { return }
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self.parentViewModel.presentEmojiPicker(tag: self.tagForInputView)
})
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emojiButton.accessibilityLabel = NSLocalizedString("compose.emoji-button", comment: "")
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let addButton = UIBarButtonItem(
image: UIImage(systemName: "plus.circle.fill"),
primaryAction: UIAction { [weak self] _ in
guard let self = self else { return }
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self.parentViewModel.insert(after: self.viewModel)
})
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switch parentViewModel.identityContext.appPreferences.statusWord {
case .toot:
addButton.accessibilityLabel =
NSLocalizedString("compose.add-button-accessibility-label.toot", comment: "")
case .post:
addButton.accessibilityLabel =
NSLocalizedString("compose.add-button-accessibility-label.post", comment: "")
}
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let charactersBarItem = UIBarButtonItem()
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charactersBarItem.isEnabled = false
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toolbar.items = [
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attachmentButton,
UIBarButtonItem.fixedSpace(.defaultSpacing),
pollButton,
UIBarButtonItem.fixedSpace(.defaultSpacing),
visibilityButton,
UIBarButtonItem.fixedSpace(.defaultSpacing),
contentWarningButton,
UIBarButtonItem.fixedSpace(.defaultSpacing),
emojiButton,
UIBarButtonItem.flexibleSpace(),
charactersBarItem,
UIBarButtonItem.fixedSpace(.defaultSpacing),
addButton]
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viewModel.$canAddAttachment
.sink { attachmentButton.isEnabled = $0 }
.store(in: &cancellables)
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viewModel.$attachmentViewModels
.combineLatest(viewModel.$attachmentUpload)
.sink { pollButton.isEnabled = $0.isEmpty && $1 == nil }
.store(in: &cancellables)
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viewModel.$remainingCharacters.sink {
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charactersBarItem.title = String($0)
charactersBarItem.setTitleTextAttributes(
[.foregroundColor: $0 < 0 ? UIColor.systemRed : UIColor.label],
for: .disabled)
charactersBarItem.accessibilityHint = String.localizedStringWithFormat(
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NSLocalizedString("compose.characters-remaining-accessibility-label-%ld", comment: ""),
$0)
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}
.store(in: &cancellables)
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viewModel.$isPostable
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.sink { addButton.isEnabled = $0 }
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.store(in: &cancellables)
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self.autocompleteCollectionView.publisher(for: \.contentSize)
.map(\.height)
.removeDuplicates()
.throttle(for: .seconds(TimeInterval.shortAnimationDuration), scheduler: DispatchQueue.main, latest: true)
.sink { [weak self] height in
UIView.animate(withDuration: .zeroIfReduceMotion(.shortAnimationDuration)) {
self?.setAutocompleteCollectionViewHeight(height)
}
}
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.store(in: &cancellables)
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parentViewModel.$visibility
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.sink { [weak self] in
visibilityButton.image = UIImage(systemName: $0.systemImageName)
visibilityButton.menu = self?.visibilityMenu(selectedVisibility: $0)
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visibilityButton.accessibilityLabel = String.localizedStringWithFormat(
NSLocalizedString("compose.visibility-button.accessibility-label-%@", comment: ""),
$0.title ?? "")
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}
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.store(in: &cancellables)
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}
}
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extension CompositionInputAccessoryView: UICollectionViewDelegate {
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
collectionView.deselectItem(at: indexPath, animated: true)
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guard let item = autocompleteDataSource.itemIdentifier(for: indexPath) else { return }
switch item {
case let .account(account):
autocompleteSelectionsSubject.send("@".appending(account.acct))
case let .tag(tag):
autocompleteSelectionsSubject.send("#".appending(tag.name))
case let .emoji(emoji):
let escaped = emoji.applyingDefaultSkinTone(identityContext: parentViewModel.identityContext).escaped
autocompleteSelectionsSubject.send(escaped)
autocompleteDataSource.updateUse(emoji: emoji)
}
UISelectionFeedbackGenerator().selectionChanged()
// To dismiss without waiting for the throttle
UIView.animate(withDuration: .zeroIfReduceMotion(.shortAnimationDuration)) {
self.setAutocompleteCollectionViewHeight(.hairline)
}
}
func collectionView(_ collectionView: UICollectionView,
contextMenuConfigurationForItemAt indexPath: IndexPath,
point: CGPoint) -> UIContextMenuConfiguration? {
guard let item = autocompleteDataSource.itemIdentifier(for: indexPath),
case let .emoji(emojiItem) = item,
case let .system(emoji, _) = emojiItem,
!emoji.skinToneVariations.isEmpty
else { return nil }
return UIContextMenuConfiguration(identifier: nil, previewProvider: nil) { _ in
UIMenu(children: ([emoji] + emoji.skinToneVariations).map { skinToneVariation in
UIAction(title: skinToneVariation.emoji) { [weak self] _ in
self?.autocompleteSelectionsSubject.send(skinToneVariation.emoji)
self?.autocompleteDataSource.updateUse(emoji: emojiItem)
}
})
}
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}
}
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private extension CompositionInputAccessoryView {
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static func autocompleteLayout() -> UICollectionViewLayout {
var listConfig = UICollectionLayoutListConfiguration(appearance: .plain)
listConfig.backgroundColor = .clear
return UICollectionViewCompositionalLayout { index, environment -> NSCollectionLayoutSection? in
guard let autocompleteSection = AutocompleteSection(rawValue: index) else { return nil }
switch autocompleteSection {
case .search:
return .list(using: listConfig, layoutEnvironment: environment)
case .emoji:
let itemSize = NSCollectionLayoutSize(
widthDimension: .fractionalWidth(1.0),
heightDimension: .fractionalHeight(1.0))
let item = NSCollectionLayoutItem(layoutSize: itemSize)
let groupSize = NSCollectionLayoutSize(
widthDimension: .absolute(.minimumButtonDimension),
heightDimension: .absolute(.minimumButtonDimension))
let group = NSCollectionLayoutGroup.horizontal(layoutSize: groupSize, subitems: [item])
let section = NSCollectionLayoutSection(group: group)
section.interGroupSpacing = .defaultSpacing
section.orthogonalScrollingBehavior = .continuous
section.contentInsets = NSDirectionalEdgeInsets(
top: .compactSpacing,
leading: .compactSpacing,
bottom: .compactSpacing,
trailing: .compactSpacing)
return section
}
}
}
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func visibilityMenu(selectedVisibility: Status.Visibility) -> UIMenu {
UIMenu(children: Status.Visibility.allCasesExceptUnknown.reversed().map { visibility in
UIAction(
title: visibility.title ?? "",
image: UIImage(systemName: visibility.systemImageName),
discoverabilityTitle: visibility.description,
state: visibility == selectedVisibility ? .on : .off) { [weak self] _ in
self?.parentViewModel.visibility = visibility
}
})
}
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func setAutocompleteCollectionViewHeight(_ height: CGFloat) {
let autocompleteCollectionViewHeight = min(max(height, .hairline), Self.autocompleteCollectionViewMaxHeight)
autocompleteCollectionViewHeightConstraint.constant = autocompleteCollectionViewHeight
autocompleteCollectionView.alpha = autocompleteCollectionViewHeightConstraint.constant == .hairline ? 0 : 1
heightConstraint?.constant = .minimumButtonDimension + autocompleteCollectionViewHeight
updateConstraints()
superview?.superview?.layoutIfNeeded()
}
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}