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//
// SelectLocationCell.swift
// MullvadVPN
//
// Created by pronebird on 02/05/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import UIKit
private let kCollapseButtonWidth: CGFloat = 24
private let kRelayIndicatorSize: CGFloat = 16
class SelectLocationCell: UITableViewCell {
typealias CollapseHandler = (SelectLocationCell) -> Void
let locationLabel = UILabel()
let statusIndicator: UIView = {
let view = UIView()
view.layer.cornerRadius = kRelayIndicatorSize * 0.5
if #available(iOS 13.0, *) {
view.layer.cornerCurve = .circular
}
return view
}()
let tickImageView = UIImageView(image: UIImage(named: "IconTick"))
let collapseButton = UIButton(type: .custom)
private let chevronDown = UIImage(named: "IconChevronDown")
private let chevronUp = UIImage(named: "IconChevronUp")
var isDisabled = false {
didSet {
updateDisabled()
updateBackgroundColor()
updateStatusIndicatorColor()
}
}
var isExpanded = false {
didSet {
updateCollapseImage()
updateAccessibilityCustomActions()
}
}
var showsCollapseControl = false {
didSet {
collapseButton.isHidden = !showsCollapseControl
updateAccessibilityCustomActions()
}
}
var didCollapseHandler: CollapseHandler?
override var indentationLevel: Int {
didSet {
updateBackgroundColor()
setLayoutMargins()
}
}
override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
super.init(style: style, reuseIdentifier: reuseIdentifier)
setupCell()
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setLayoutMargins() {
let indentation = CGFloat(indentationLevel) * indentationWidth
var contentMargins = UIMetrics.selectLocationCellLayoutMargins
contentMargins.left += indentation
contentView.layoutMargins = contentMargins
}
override func setHighlighted(_ highlighted: Bool, animated: Bool) {
super.setHighlighted(highlighted, animated: animated)
updateStatusIndicatorColor()
}
override func setSelected(_ selected: Bool, animated: Bool) {
super.setSelected(selected, animated: animated)
updateTickImage()
updateStatusIndicatorColor()
}
private func setupCell() {
indentationWidth = UIMetrics.cellIndentationWidth
backgroundColor = .clear
contentView.backgroundColor = .clear
backgroundView = UIView()
backgroundView?.backgroundColor = UIColor.Cell.backgroundColor
selectedBackgroundView = UIView()
selectedBackgroundView?.backgroundColor = UIColor.Cell.selectedBackgroundColor
locationLabel.font = UIFont.systemFont(ofSize: 17)
locationLabel.textColor = .white
tickImageView.tintColor = .white
collapseButton.accessibilityIdentifier = "CollapseButton"
collapseButton.isAccessibilityElement = false
collapseButton.tintColor = .white
collapseButton.addTarget(self, action: #selector(handleCollapseButton(_ :)), for: .touchUpInside)
[locationLabel, tickImageView, statusIndicator, collapseButton].forEach { (subview) in
subview.translatesAutoresizingMaskIntoConstraints = false
contentView.addSubview(subview)
}
updateCollapseImage()
updateAccessibilityCustomActions()
updateDisabled()
updateBackgroundColor()
setLayoutMargins()
NSLayoutConstraint.activate([
tickImageView.leadingAnchor.constraint(equalTo: contentView.layoutMarginsGuide.leadingAnchor),
tickImageView.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
statusIndicator.widthAnchor.constraint(equalToConstant: kRelayIndicatorSize),
statusIndicator.heightAnchor.constraint(equalTo: statusIndicator.widthAnchor),
statusIndicator.centerXAnchor.constraint(equalTo: tickImageView.centerXAnchor),
statusIndicator.centerYAnchor.constraint(equalTo: tickImageView.centerYAnchor),
locationLabel.leadingAnchor.constraint(equalTo: statusIndicator.trailingAnchor, constant: 12),
locationLabel.trailingAnchor.constraint(greaterThanOrEqualTo: collapseButton.leadingAnchor, constant: 0),
locationLabel.topAnchor.constraint(equalTo: contentView.layoutMarginsGuide.topAnchor),
locationLabel.bottomAnchor.constraint(equalTo: contentView.layoutMarginsGuide.bottomAnchor),
collapseButton.widthAnchor.constraint(equalToConstant: UIMetrics.contentLayoutMargins.left + UIMetrics.contentLayoutMargins.right + kCollapseButtonWidth),
collapseButton.topAnchor.constraint(equalTo: contentView.topAnchor),
collapseButton.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
collapseButton.bottomAnchor.constraint(equalTo: contentView.bottomAnchor)
])
}
private func updateTickImage() {
statusIndicator.isHidden = isSelected
tickImageView.isHidden = !isSelected
}
private func updateStatusIndicatorColor() {
statusIndicator.backgroundColor = statusIndicatorColor()
}
private func updateDisabled() {
locationLabel.alpha = isDisabled ? 0.2 : 1
collapseButton.alpha = isDisabled ? 0.2 : 1
if isDisabled {
accessibilityTraits.insert(.notEnabled)
} else {
accessibilityTraits.remove(.notEnabled)
}
}
private func updateBackgroundColor() {
backgroundView?.backgroundColor = backgroundColorForIdentationLevel()
selectedBackgroundView?.backgroundColor = selectedBackgroundColorForIndentationLevel()
}
private func backgroundColorForIdentationLevel() -> UIColor {
switch indentationLevel {
case 1:
return UIColor.SubCell.backgroundColor
case 2:
return UIColor.SubSubCell.backgroundColor
default:
return UIColor.Cell.backgroundColor
}
}
private func selectedBackgroundColorForIndentationLevel() -> UIColor {
if isDisabled {
return UIColor.Cell.disabledSelectedBackgroundColor
} else {
return UIColor.Cell.selectedBackgroundColor
}
}
private func statusIndicatorColor() -> UIColor {
if isDisabled {
return UIColor.RelayStatusIndicator.inactiveColor
} else if isHighlighted {
return UIColor.RelayStatusIndicator.highlightColor
} else {
return UIColor.RelayStatusIndicator.activeColor
}
}
@objc private func handleCollapseButton(_ sender: UIControl) {
didCollapseHandler?(self)
}
@objc private func toggleCollapseAccessibilityAction() -> Bool {
didCollapseHandler?(self)
return true
}
private func updateCollapseImage() {
let image = isExpanded ? chevronUp : chevronDown
collapseButton.setImage(image, for: .normal)
}
private func updateAccessibilityCustomActions() {
if showsCollapseControl {
let actionName = isExpanded
? NSLocalizedString("SELECT_LOCATION_COLLAPSE_ACCESSIBILITY_ACTION", tableName: "SelectLocation", comment: "")
: NSLocalizedString("SELECT_LOCATION_EXPAND_ACCESSIBILITY_ACTION", tableName: "SelectLocation", comment: "")
accessibilityCustomActions = [
UIAccessibilityCustomAction(name: actionName, target: self, selector: #selector(toggleCollapseAccessibilityAction))
]
} else {
accessibilityCustomActions = nil
}
}
}
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