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//
// SelectLocationViewController.swift
// MullvadVPN
//
// Created by pronebird on 02/05/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import MullvadLogging
import MullvadTypes
import RelayCache
import UIKit
final class SelectLocationViewController: UIViewController, UITableViewDelegate {
private var tableView: UITableView?
private let tableHeaderFooterView = SelectLocationHeaderView()
private var tableHeaderFooterViewTopConstraints: [NSLayoutConstraint] = []
private var tableHeaderFooterViewBottomConstraints: [NSLayoutConstraint] = []
private var dataSource: LocationDataSource?
private var setCachedRelaysOnViewDidLoad: CachedRelays?
private var setRelayLocationOnViewDidLoad: RelayLocation?
private var setScrollPositionOnViewDidLoad: UITableView.ScrollPosition = .none
private var isViewAppeared = false
private var showHeaderViewAtTheBottom = false {
didSet {
setTableHeaderFooterConstraints()
}
}
override var preferredStatusBarStyle: UIStatusBarStyle {
return .lightContent
}
var didSelectRelay: ((SelectLocationViewController, RelayLocation) -> Void)?
var didFinish: ((SelectLocationViewController) -> Void)?
var scrollToSelectedRelayOnViewWillAppear = true
init() {
super.init(nibName: nil, bundle: nil)
}
required init?(coder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
// MARK: - View lifecycle
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.largeTitleDisplayMode = .never
navigationItem.title = NSLocalizedString(
"NAVIGATION_TITLE",
tableName: "SelectLocation",
value: "Select Location",
comment: ""
)
navigationItem.rightBarButtonItem = UIBarButtonItem(
barButtonSystemItem: .done,
target: self,
action: #selector(handleDone)
)
let tableView = UITableView(frame: view.bounds, style: .plain)
tableView.translatesAutoresizingMaskIntoConstraints = false
tableView.backgroundColor = .clear
tableView.separatorColor = .secondaryColor
tableView.separatorInset = .zero
tableView.estimatedRowHeight = 53
tableView.indicatorStyle = .white
self.tableView = tableView
dataSource = LocationDataSource(tableView: tableView)
tableView.dataSource = dataSource
dataSource?.didSelectRelayLocation = { [weak self] location in
guard let self = self else { return }
self.didSelectRelay?(self, location)
}
view.accessibilityElements = [tableHeaderFooterView, tableView]
view.backgroundColor = .secondaryColor
view.addSubview(tableView)
tableHeaderFooterView.translatesAutoresizingMaskIntoConstraints = false
view.addSubview(tableHeaderFooterView)
tableHeaderFooterViewTopConstraints = [
tableHeaderFooterView.topAnchor.constraint(equalTo: view.topAnchor),
tableView.topAnchor.constraint(equalTo: tableHeaderFooterView.bottomAnchor),
tableView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
]
tableHeaderFooterViewBottomConstraints = [
tableHeaderFooterView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
tableView.topAnchor.constraint(equalTo: view.topAnchor),
tableView.bottomAnchor.constraint(equalTo: tableHeaderFooterView.topAnchor),
]
NSLayoutConstraint.activate([
tableHeaderFooterView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableHeaderFooterView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
tableView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
tableView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
])
setTableHeaderFooterConstraints()
if let setCachedRelaysOnViewDidLoad = setCachedRelaysOnViewDidLoad {
dataSource?.setRelays(setCachedRelaysOnViewDidLoad.relays)
}
if let setRelayLocationOnViewDidLoad = setRelayLocationOnViewDidLoad {
dataSource?.setSelectedRelayLocation(
setRelayLocationOnViewDidLoad,
animated: false
)
}
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
// Show header view at the bottom when controller is presented inline and show header view
// at the top of the view when controller is presented modally.
showHeaderViewAtTheBottom = presentingViewController == nil
if let indexPath = dataSource?.indexPathForSelectedRelay(),
scrollToSelectedRelayOnViewWillAppear, !isViewAppeared
{
tableView?.scrollToRow(at: indexPath, at: .middle, animated: false)
}
}
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
isViewAppeared = true
tableView?.flashScrollIndicators()
}
override func viewDidDisappear(_ animated: Bool) {
super.viewDidDisappear(animated)
isViewAppeared = false
}
override func viewWillTransition(
to size: CGSize,
with coordinator: UIViewControllerTransitionCoordinator
) {
super.viewWillTransition(to: size, with: coordinator)
coordinator.animate(alongsideTransition: nil) { context in
guard let indexPath = self.dataSource?.indexPathForSelectedRelay() else { return }
self.tableView?.scrollToRow(at: indexPath, at: .middle, animated: false)
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
updateTableHeaderTopLayoutMargin()
}
// MARK: - Public
func setCachedRelays(_ cachedRelays: CachedRelays) {
guard isViewLoaded else {
setCachedRelaysOnViewDidLoad = cachedRelays
return
}
dataSource?.setRelays(cachedRelays.relays)
}
func setSelectedRelayLocation(
_ relayLocation: RelayLocation?,
animated: Bool,
scrollPosition: UITableView.ScrollPosition
) {
guard isViewLoaded else {
setRelayLocationOnViewDidLoad = relayLocation
setScrollPositionOnViewDidLoad = scrollPosition
return
}
dataSource?.setSelectedRelayLocation(
relayLocation,
animated: animated
)
}
// MARK: - Private
private func updateTableHeaderTopLayoutMargin() {
// When contained within the navigation controller, we want the distance between
// the navigation title and the table header label to be exactly 24pt.
if let navigationBar = navigationController?.navigationBar, !showHeaderViewAtTheBottom {
tableHeaderFooterView.topLayoutMarginAdjustmentForNavigationBarTitle = navigationBar
.titleLabelBottomInset
} else {
tableHeaderFooterView.topLayoutMarginAdjustmentForNavigationBarTitle = 0
}
}
private func setTableHeaderFooterConstraints() {
if showHeaderViewAtTheBottom {
NSLayoutConstraint.deactivate(
tableHeaderFooterViewTopConstraints
)
NSLayoutConstraint.activate(tableHeaderFooterViewBottomConstraints)
} else {
NSLayoutConstraint.deactivate(
tableHeaderFooterViewBottomConstraints
)
NSLayoutConstraint.activate(tableHeaderFooterViewTopConstraints)
}
view.layoutIfNeeded()
}
@objc private func handleDone() {
didFinish?(self)
}
}
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