metatext/Views/PollView.swift

195 lines
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Swift
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// Copyright © 2020 Metabolist. All rights reserved.
import Combine
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import Mastodon
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import UIKit
import ViewModels
final class PollView: UIView {
private let stackView = UIStackView()
private let voteButtonStackView = UIStackView()
private let bottomStackView = UIStackView()
private let voteButton = UIButton(type: .system)
private let refreshButton = UIButton(type: .system)
private let refreshDividerLabel = UILabel()
private let votesCountLabel = UILabel()
private let votesCountDividerLabel = UILabel()
private let expiryLabel = UILabel()
private var selectionCancellable: AnyCancellable?
var viewModel: StatusViewModel? {
didSet {
for view in stackView.arrangedSubviews {
stackView.removeArrangedSubview(view)
view.removeFromSuperview()
}
guard let viewModel = viewModel else {
selectionCancellable = nil
return
}
if !viewModel.isPollExpired, !viewModel.hasVotedInPoll {
for (index, option) in viewModel.pollOptions.enumerated() {
let button = PollOptionButton(
title: option.title,
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emojis: viewModel.pollEmojis,
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multipleSelection: viewModel.isPollMultipleSelection)
button.addAction(
UIAction { _ in
if viewModel.pollOptionSelections.contains(index) {
viewModel.pollOptionSelections.remove(index)
} else if viewModel.isPollMultipleSelection {
viewModel.pollOptionSelections.insert(index)
} else {
viewModel.pollOptionSelections = [index]
}
},
for: .touchUpInside)
stackView.addArrangedSubview(button)
}
} else {
for (index, option) in viewModel.pollOptions.enumerated() {
let resultView = PollResultView(
option: option,
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emojis: viewModel.pollEmojis,
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selected: viewModel.pollOwnVotes.contains(index),
multipleSelection: viewModel.isPollMultipleSelection,
votersCount: viewModel.pollVotersCount)
stackView.addArrangedSubview(resultView)
}
}
if !viewModel.isPollExpired, !viewModel.hasVotedInPoll {
stackView.addArrangedSubview(voteButtonStackView)
selectionCancellable = viewModel.$pollOptionSelections.sink { [weak self] in
guard let self = self else { return }
for (index, view) in self.stackView.arrangedSubviews.enumerated() {
(view as? UIButton)?.isSelected = $0.contains(index)
}
self.voteButton.isEnabled = !$0.isEmpty
}
} else {
selectionCancellable = nil
}
stackView.addArrangedSubview(bottomStackView)
votesCountLabel.text = String.localizedStringWithFormat(
NSLocalizedString("status.poll.participation-count", comment: ""),
viewModel.pollVotersCount)
if !viewModel.isPollExpired, let pollTimeLeft = viewModel.pollTimeLeft {
expiryLabel.text = String.localizedStringWithFormat(
NSLocalizedString("status.poll.time-left", comment: ""),
pollTimeLeft)
refreshButton.isHidden = false
} else {
expiryLabel.text = NSLocalizedString("status.poll.closed", comment: "")
refreshButton.isHidden = true
}
refreshDividerLabel.isHidden = refreshButton.isHidden
}
}
override init(frame: CGRect) {
super.init(frame: frame)
initialSetup()
}
@available(*, unavailable)
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
extension PollView {
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static func estimatedHeight(width: CGFloat,
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identityContext: IdentityContext,
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status: Status,
configuration: CollectionItem.StatusConfiguration) -> CGFloat {
if let poll = status.displayStatus.poll {
var height: CGFloat = 0
let open = !poll.expired && !poll.voted
for option in poll.options {
height += open ? PollOptionButton.estimatedHeight(width: width, title: option.title)
: PollResultView.estimatedHeight(width: width, title: option.title)
height += .defaultSpacing
}
if open {
height += .minimumButtonDimension + .defaultSpacing
}
height += .minimumButtonDimension / 2
return height
} else {
return 0
}
}
}
private extension PollView {
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func initialSetup() {
addSubview(stackView)
stackView.translatesAutoresizingMaskIntoConstraints = false
stackView.axis = .vertical
stackView.spacing = .defaultSpacing
voteButtonStackView.addArrangedSubview(voteButton)
voteButtonStackView.addArrangedSubview(UIView())
voteButton.titleLabel?.font = .preferredFont(forTextStyle: .headline)
voteButton.titleLabel?.adjustsFontForContentSizeCategory = true
voteButton.setTitle(NSLocalizedString("status.poll.vote", comment: ""), for: .normal)
voteButton.addAction(UIAction { [weak self] _ in self?.viewModel?.vote() }, for: .touchUpInside)
bottomStackView.spacing = .compactSpacing
bottomStackView.addArrangedSubview(refreshButton)
refreshButton.titleLabel?.font = .preferredFont(forTextStyle: .caption1)
refreshButton.titleLabel?.adjustsFontForContentSizeCategory = true
refreshButton.setTitle(NSLocalizedString("status.poll.refresh", comment: ""), for: .normal)
refreshButton.addAction(UIAction { [weak self] _ in self?.viewModel?.refreshPoll() }, for: .touchUpInside)
for label in [refreshDividerLabel, votesCountLabel, votesCountDividerLabel, expiryLabel] {
bottomStackView.addArrangedSubview(label)
label.font = .preferredFont(forTextStyle: .caption1)
label.textColor = .secondaryLabel
label.adjustsFontForContentSizeCategory = true
}
refreshDividerLabel.text = ""
votesCountDividerLabel.text = ""
bottomStackView.addArrangedSubview(UIView())
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let voteButtonHeightConstraint = voteButton.heightAnchor.constraint(equalToConstant: .minimumButtonDimension)
let refreshButtonHeightConstraint = refreshButton.heightAnchor.constraint(
equalToConstant: .minimumButtonDimension / 2)
refreshButtonHeightConstraint.priority = .justBelowMax
refreshButtonHeightConstraint.priority = .justBelowMax
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NSLayoutConstraint.activate([
stackView.leadingAnchor.constraint(equalTo: leadingAnchor),
stackView.topAnchor.constraint(equalTo: topAnchor),
stackView.trailingAnchor.constraint(equalTo: trailingAnchor),
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stackView.bottomAnchor.constraint(equalTo: bottomAnchor),
voteButtonHeightConstraint,
refreshButtonHeightConstraint
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])
}
}