184 lines
8.1 KiB
Swift
184 lines
8.1 KiB
Swift
// Copyright © 2020 Metabolist. All rights reserved.
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import Combine
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import Mastodon
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import UIKit
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import ViewModels
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final class AttachmentsView: UIView {
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private let containerStackView = UIStackView()
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private let leftStackView = UIStackView()
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private let rightStackView = UIStackView()
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private let curtain = UIVisualEffectView(effect: UIBlurEffect(style: .systemMaterial))
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private let curtainButton = UIButton(type: .system)
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private let hideButtonBackground = UIVisualEffectView(effect: UIBlurEffect(style: .systemMaterial))
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private let hideButton = UIButton()
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private var aspectRatioConstraint: NSLayoutConstraint?
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private var cancellables = Set<AnyCancellable>()
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var viewModel: AttachmentsRenderingViewModel? {
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didSet {
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for stackView in [leftStackView, rightStackView] {
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for view in stackView.arrangedSubviews {
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stackView.removeArrangedSubview(view)
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view.removeFromSuperview()
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}
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}
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guard let viewModel = viewModel else { return }
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rightStackView.isHidden = viewModel.attachmentViewModels.count == 1
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for (index, attachmentViewModel) in viewModel.attachmentViewModels.enumerated() {
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let attachmentView = AttachmentView(viewModel: attachmentViewModel, parentViewModel: viewModel)
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attachmentView.playing = viewModel.shouldShowAttachments && attachmentViewModel.shouldAutoplay
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attachmentView.removeButton.isHidden = !viewModel.canRemoveAttachments
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if viewModel.attachmentViewModels.count == 2 && index == 1
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|| viewModel.attachmentViewModels.count == 3 && index != 0
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|| viewModel.attachmentViewModels.count > 3 && index % 2 != 0 {
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rightStackView.addArrangedSubview(attachmentView)
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} else {
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leftStackView.addArrangedSubview(attachmentView)
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}
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}
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let newAspectRatio: CGFloat
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if viewModel.attachmentViewModels.count == 1,
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let aspectRatio = viewModel.attachmentViewModels.first?.attachment.aspectRatio {
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newAspectRatio = max(CGFloat(aspectRatio), 16 / 9)
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} else {
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newAspectRatio = 16 / 9
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}
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aspectRatioConstraint?.isActive = false
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aspectRatioConstraint = widthAnchor.constraint(equalTo: heightAnchor, multiplier: newAspectRatio)
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aspectRatioConstraint?.priority = .justBelowMax
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aspectRatioConstraint?.isActive = true
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curtain.isHidden = viewModel.shouldShowAttachments
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curtainButton.setTitle(
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NSLocalizedString((viewModel.sensitive)
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? "attachment.sensitive-content"
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: "attachment.media-hidden",
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comment: ""),
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for: .normal)
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hideButtonBackground.isHidden = !viewModel.shouldShowHideAttachmentsButton
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}
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}
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override init(frame: CGRect) {
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super.init(frame: frame)
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initialSetup()
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}
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@available(*, unavailable)
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required init?(coder: NSCoder) {
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fatalError("init(coder:) has not been implemented")
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}
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}
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extension AttachmentsView {
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static func estimatedHeight(width: CGFloat,
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identityContext: IdentityContext,
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status: Status,
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configuration: CollectionItem.StatusConfiguration) -> CGFloat {
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let height: CGFloat
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if status.displayStatus.mediaAttachments.count == 1,
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let aspectRatio = status.mediaAttachments.first?.aspectRatio {
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height = width / max(CGFloat(aspectRatio), 16 / 9)
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} else {
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height = width / (16 / 9)
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}
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return height
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}
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var shouldAutoplay: Bool {
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guard !isHidden, let viewModel = viewModel, viewModel.shouldShowAttachments else { return false }
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return viewModel.attachmentViewModels.allSatisfy(\.shouldAutoplay)
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}
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}
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private extension AttachmentsView {
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// swiftlint:disable:next function_body_length
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func initialSetup() {
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backgroundColor = .clear
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layoutMargins = .zero
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clipsToBounds = true
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layer.cornerRadius = .defaultCornerRadius
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addSubview(containerStackView)
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containerStackView.translatesAutoresizingMaskIntoConstraints = false
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containerStackView.distribution = .fillEqually
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containerStackView.spacing = .compactSpacing
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leftStackView.distribution = .fillEqually
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leftStackView.spacing = .compactSpacing
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leftStackView.axis = .vertical
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rightStackView.distribution = .fillEqually
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rightStackView.spacing = .compactSpacing
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rightStackView.axis = .vertical
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containerStackView.addArrangedSubview(leftStackView)
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containerStackView.addArrangedSubview(rightStackView)
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let toggleShowAttachmentsAction = UIAction { [weak self] _ in
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self?.viewModel?.toggleShowAttachments()
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}
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addSubview(hideButtonBackground)
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hideButtonBackground.translatesAutoresizingMaskIntoConstraints = false
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hideButtonBackground.clipsToBounds = true
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hideButtonBackground.layer.cornerRadius = .defaultCornerRadius
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hideButton.addAction(toggleShowAttachmentsAction, for: .touchUpInside)
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hideButtonBackground.contentView.addSubview(hideButton)
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hideButton.translatesAutoresizingMaskIntoConstraints = false
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hideButton.setImage(
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UIImage(systemName: "eye.slash", withConfiguration: UIImage.SymbolConfiguration(scale: .medium)),
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for: .normal)
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addSubview(curtain)
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curtain.translatesAutoresizingMaskIntoConstraints = false
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curtain.contentView.addSubview(curtainButton)
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curtainButton.addAction(toggleShowAttachmentsAction, for: .touchUpInside)
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curtainButton.translatesAutoresizingMaskIntoConstraints = false
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curtainButton.titleLabel?.font = .preferredFont(forTextStyle: .headline)
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curtainButton.titleLabel?.adjustsFontForContentSizeCategory = true
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NSLayoutConstraint.activate([
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containerStackView.leadingAnchor.constraint(equalTo: leadingAnchor),
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containerStackView.trailingAnchor.constraint(equalTo: trailingAnchor),
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containerStackView.topAnchor.constraint(equalTo: topAnchor),
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containerStackView.bottomAnchor.constraint(equalTo: bottomAnchor),
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hideButtonBackground.topAnchor.constraint(equalTo: topAnchor, constant: .defaultSpacing),
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hideButtonBackground.leadingAnchor.constraint(equalTo: leadingAnchor, constant: .defaultSpacing),
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hideButton.topAnchor.constraint(
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equalTo: hideButtonBackground.contentView.topAnchor,
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constant: .compactSpacing),
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hideButton.leadingAnchor.constraint(
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equalTo: hideButtonBackground.contentView.leadingAnchor,
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constant: .compactSpacing),
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hideButtonBackground.contentView.trailingAnchor.constraint(
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equalTo: hideButton.trailingAnchor,
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constant: .compactSpacing),
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hideButtonBackground.contentView.bottomAnchor.constraint(
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equalTo: hideButton.bottomAnchor,
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constant: .compactSpacing),
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curtain.topAnchor.constraint(equalTo: topAnchor),
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curtain.leadingAnchor.constraint(equalTo: leadingAnchor),
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curtain.trailingAnchor.constraint(equalTo: trailingAnchor),
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curtain.bottomAnchor.constraint(equalTo: bottomAnchor),
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curtainButton.topAnchor.constraint(equalTo: curtain.contentView.topAnchor),
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curtainButton.leadingAnchor.constraint(equalTo: curtain.contentView.leadingAnchor),
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curtainButton.trailingAnchor.constraint(equalTo: curtain.contentView.trailingAnchor),
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curtainButton.bottomAnchor.constraint(equalTo: curtain.contentView.bottomAnchor)
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])
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}
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var attachmentViews: [AttachmentView] {
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(leftStackView.arrangedSubviews + rightStackView.arrangedSubviews)
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.compactMap { $0 as? AttachmentView }
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}
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}
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