1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
|
//
// SelectLocationViewController.swift
// MullvadVPN
//
// Created by pronebird on 02/05/2019.
// Copyright © 2019 Mullvad VPN AB. All rights reserved.
//
import UIKit
import Logging
class SelectLocationViewController: UIViewController, RelayCacheObserver, UITableViewDelegate {
private enum ReuseIdentifiers: String {
case cell
case header
}
private lazy var tableView: UITableView = {
let tableView = UITableView(frame: view.bounds, style: .plain)
tableView.translatesAutoresizingMaskIntoConstraints = true
tableView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
tableView.backgroundColor = .clear
tableView.separatorColor = .secondaryColor
tableView.separatorInset = .zero
tableView.estimatedRowHeight = 53
tableView.estimatedSectionHeaderHeight = 109
tableView.indicatorStyle = .white
tableView.register(SelectLocationHeaderView.self, forHeaderFooterViewReuseIdentifier: ReuseIdentifiers.header.rawValue)
tableView.register(SelectLocationCell.self, forCellReuseIdentifier: ReuseIdentifiers.cell.rawValue)
return tableView
}()
private let logger = Logger(label: "SelectLocationController")
private var dataSource: LocationDataSource?
private var setCachedRelaysOnViewDidLoad: CachedRelays?
private var setRelayLocationOnViewDidLoad: RelayLocation?
private var isViewAppeared = false
var didSelectRelayLocation: ((SelectLocationViewController, RelayLocation) -> 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()
view.backgroundColor = .secondaryColor
view.addSubview(tableView)
dataSource = LocationDataSource(
tableView: self.tableView,
cellProvider: { [weak self] (tableView, indexPath, item) -> UITableViewCell? in
guard let self = self else { return nil }
let cell = tableView.dequeueReusableCell(
withIdentifier: ReuseIdentifiers.cell.rawValue, for: indexPath) as! SelectLocationCell
cell.accessibilityIdentifier = item.location.stringRepresentation
cell.isDisabled = !item.isActive
cell.locationLabel.text = item.displayName
cell.statusIndicator.isActive = item.isActive
cell.showsCollapseControl = item.isCollapsible
cell.isExpanded = item.showsChildren
cell.didCollapseHandler = { [weak self] (cell) in
self?.collapseCell(cell)
}
return cell
})
tableView.delegate = self
tableView.dataSource = dataSource
if let setCachedRelaysOnViewDidLoad = self.setCachedRelaysOnViewDidLoad {
dataSource?.setRelays(setCachedRelaysOnViewDidLoad.relays)
}
if let setRelayLocationOnViewDidLoad = setRelayLocationOnViewDidLoad {
dataSource?.setSelectedRelayLocation(
setRelayLocationOnViewDidLoad,
showHiddenParents: true,
animated: false,
scrollPosition: .none
)
}
RelayCache.shared.addObserver(self)
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
if let indexPath = dataSource?.indexPathForSelectedRelay(), scrollToSelectedRelayOnViewWillAppear, !isViewAppeared {
self.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
}
// MARK: - UITableViewDelegate
func tableView(_ tableView: UITableView, shouldHighlightRowAt indexPath: IndexPath) -> Bool {
return dataSource?.item(for: indexPath)?.isActive ?? false
}
func tableView(_ tableView: UITableView, indentationLevelForRowAt indexPath: IndexPath) -> Int {
return dataSource?.item(for: indexPath)?.indentationLevel ?? 0
}
func tableView(_ tableView: UITableView, willDisplay cell: UITableViewCell, forRowAt indexPath: IndexPath) {
if let item = dataSource?.item(for: indexPath), item.location == dataSource?.selectedRelayLocation {
cell.setSelected(true, animated: false)
}
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
guard let item = dataSource?.item(for: indexPath) else { return }
dataSource?.setSelectedRelayLocation(
item.location,
showHiddenParents: false,
animated: false,
scrollPosition: .none
)
didSelectRelayLocation?(self, item.location)
}
func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
assert(section == 0)
let view = tableView.dequeueReusableHeaderFooterView(withIdentifier: ReuseIdentifiers.header.rawValue) as! SelectLocationHeaderView
// 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 as? CustomNavigationBar {
view.topLayoutMarginAdjustmentForNavigationBarTitle = navigationBar.titleLabelBottomInset
}
return view
}
// MARK: - RelayCacheObserver
func relayCache(_ relayCache: RelayCache, didUpdateCachedRelays cachedRelays: CachedRelays) {
DispatchQueue.main.async {
self.didReceiveCachedRelays(cachedRelays)
}
}
// MARK: - Public
func prefetchData(completionHandler: @escaping (RelayCacheError?) -> Void) {
RelayCache.shared.read { (result) in
DispatchQueue.main.async {
switch result {
case .success(let cachedRelays):
self.didReceiveCachedRelays(cachedRelays)
completionHandler(nil)
case .failure(let error):
completionHandler(error)
}
}
}
}
func setSelectedRelayLocation(_ relayLocation: RelayLocation?, animated: Bool, scrollPosition: UITableView.ScrollPosition) {
guard isViewLoaded else {
self.setRelayLocationOnViewDidLoad = relayLocation
return
}
self.dataSource?.setSelectedRelayLocation(
relayLocation,
showHiddenParents: true,
animated: animated,
scrollPosition: scrollPosition
)
}
// MARK: - Relay list handling
private func didReceiveCachedRelays(_ cachedRelays: CachedRelays) {
guard isViewLoaded else {
self.setCachedRelaysOnViewDidLoad = cachedRelays
return
}
self.dataSource?.setRelays(cachedRelays.relays)
}
// MARK: - Collapsible cells
private func collapseCell(_ cell: SelectLocationCell) {
guard let cellIndexPath = tableView.indexPath(for: cell),
let dataSource = dataSource, let location = dataSource.relayLocation(for: cellIndexPath) else {
return
}
dataSource.toggleChildren(location, animated: true)
}
}
|
