330 lines
12 KiB
Swift
330 lines
12 KiB
Swift
//
|
|
// MultiColumnNavigationController.swift
|
|
// Tusker
|
|
//
|
|
// Created by Shadowfacts on 8/24/23.
|
|
// Copyright © 2023 Shadowfacts. All rights reserved.
|
|
//
|
|
|
|
import UIKit
|
|
|
|
class MultiColumnNavigationController: UIViewController {
|
|
|
|
private var isManuallyUpdating = false
|
|
var viewControllers: [UIViewController] = [] {
|
|
didSet {
|
|
guard isViewLoaded,
|
|
!isManuallyUpdating else {
|
|
return
|
|
}
|
|
updateViews()
|
|
scrollToEnd(animated: false)
|
|
}
|
|
}
|
|
|
|
private var scrollView = UIScrollView()
|
|
private var stackView = UIStackView()
|
|
|
|
init() {
|
|
super.init(nibName: nil, bundle: nil)
|
|
}
|
|
|
|
required init?(coder: NSCoder) {
|
|
fatalError("init(coder:) has not been implemented")
|
|
}
|
|
|
|
override func viewDidLoad() {
|
|
super.viewDidLoad()
|
|
|
|
view.backgroundColor = .appSecondaryBackground
|
|
|
|
scrollView.contentInsetAdjustmentBehavior = .always
|
|
scrollView.contentInset = UIEdgeInsets(top: 0, left: 8, bottom: 0, right: 8)
|
|
scrollView.alwaysBounceHorizontal = true
|
|
scrollView.translatesAutoresizingMaskIntoConstraints = false
|
|
|
|
stackView.axis = .horizontal
|
|
stackView.spacing = 8
|
|
stackView.alignment = .fill
|
|
stackView.translatesAutoresizingMaskIntoConstraints = false
|
|
scrollView.addSubview(stackView)
|
|
|
|
view.addSubview(scrollView)
|
|
NSLayoutConstraint.activate([
|
|
scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
|
|
scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
|
|
scrollView.topAnchor.constraint(equalTo: view.topAnchor),
|
|
scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
|
|
|
|
stackView.leadingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.leadingAnchor),
|
|
stackView.trailingAnchor.constraint(equalTo: scrollView.contentLayoutGuide.trailingAnchor),
|
|
stackView.topAnchor.constraint(equalTo: scrollView.contentLayoutGuide.topAnchor),
|
|
stackView.bottomAnchor.constraint(equalTo: scrollView.contentLayoutGuide.bottomAnchor),
|
|
stackView.heightAnchor.constraint(equalTo: view.safeAreaLayoutGuide.heightAnchor),
|
|
])
|
|
|
|
updateViews()
|
|
}
|
|
|
|
private func updateViews() {
|
|
var i = 0
|
|
while i < viewControllers.count {
|
|
let needsCloseButton = i > 0
|
|
if i <= stackView.arrangedSubviews.count - 1 {
|
|
let existing = stackView.arrangedSubviews[i] as! ColumnView
|
|
existing.setContent(viewControllers[i], needsCloseButton: needsCloseButton)
|
|
} else {
|
|
let new = ColumnView(owner: self, contentViewController: viewControllers[i], needsCloseButton: needsCloseButton)
|
|
stackView.addArrangedSubview(new)
|
|
}
|
|
i += 1
|
|
}
|
|
|
|
while i < stackView.arrangedSubviews.count {
|
|
let toRemove = stackView.arrangedSubviews[i] as! ColumnView
|
|
toRemove.willRemoveColumn()
|
|
stackView.removeArrangedSubview(toRemove)
|
|
}
|
|
}
|
|
|
|
override func show(_ vc: UIViewController, sender: Any?) {
|
|
if let sender = sender as? UIViewController {
|
|
var index: Int? = nil
|
|
var current: UIViewController? = sender
|
|
while let c = current {
|
|
index = viewControllers.firstIndex(of: c)
|
|
if index != nil {
|
|
break
|
|
} else {
|
|
current = c.parent
|
|
}
|
|
}
|
|
if let index {
|
|
replaceViewControllers([vc], after: index, animated: true)
|
|
} else {
|
|
pushViewController(vc, animated: true)
|
|
}
|
|
} else {
|
|
pushViewController(vc, animated: true)
|
|
}
|
|
|
|
SplitNavigationController.clearSelectedRow(sender: sender)
|
|
}
|
|
|
|
func replaceViewControllers(_ vcs: [UIViewController], after afterIndex: Int, animated: Bool) {
|
|
if afterIndex == viewControllers.count - 1 && vcs.count == 1 {
|
|
pushViewController(vcs[0], animated: animated)
|
|
} else {
|
|
viewControllers = Array(viewControllers[...afterIndex]) + vcs
|
|
scrollToEnd(animated: animated)
|
|
}
|
|
}
|
|
|
|
private func scrollToEnd(animated: Bool) {
|
|
if viewControllers.isEmpty {
|
|
scrollView.setContentOffset(.init(x: -scrollView.adjustedLeadingContentInset, y: -scrollView.adjustedContentInset.top), animated: false)
|
|
} else {
|
|
scrollColumnToEnd(columnIndex: viewControllers.count - 1, animated: animated)
|
|
}
|
|
}
|
|
|
|
private func scrollColumnToEnd(columnIndex: Int, animated: Bool) {
|
|
scrollView.layoutIfNeeded()
|
|
let column = stackView.arrangedSubviews[columnIndex]
|
|
let columnFrame = column.convert(column.bounds, to: scrollView)
|
|
let offset: CGFloat
|
|
if columnFrame.maxX < scrollView.bounds.width - scrollView.adjustedTrailingContentInset {
|
|
offset = -scrollView.adjustedLeadingContentInset
|
|
} else {
|
|
offset = columnFrame.minX + scrollView.adjustedLeadingContentInset - (scrollView.bounds.width - columnFrame.width)
|
|
}
|
|
scrollView.setContentOffset(CGPoint(x: offset, y: -scrollView.adjustedContentInset.top), animated: animated)
|
|
}
|
|
|
|
fileprivate func closeColumn(_ vc: UIViewController) {
|
|
let index = viewControllers.firstIndex(of: vc)!
|
|
guard index > 0 else {
|
|
// Can't close the last column
|
|
return
|
|
}
|
|
isManuallyUpdating = true
|
|
defer { isManuallyUpdating = false }
|
|
viewControllers.removeSubrange(index...)
|
|
animateChanges {
|
|
for column in self.stackView.arrangedSubviews[index...] {
|
|
column.layer.opacity = 0
|
|
}
|
|
self.scrollColumnToEnd(columnIndex: index - 1, animated: false)
|
|
} completion: {
|
|
self.updateViews()
|
|
}
|
|
|
|
}
|
|
|
|
private func animateChanges(_ animations: @escaping () -> Void, completion: (() -> Void)? = nil) {
|
|
let animator = UIViewPropertyAnimator(duration: 0.3, timingParameters: UISpringTimingParameters())
|
|
animator.addAnimations(animations)
|
|
animator.addCompletion { _ in
|
|
completion?()
|
|
}
|
|
animator.startAnimation()
|
|
}
|
|
}
|
|
|
|
extension MultiColumnNavigationController: NavigationControllerProtocol {
|
|
var topViewController: UIViewController? {
|
|
viewControllers.last
|
|
}
|
|
|
|
func popToRootViewController(animated: Bool) -> [UIViewController]? {
|
|
let removed = Array(viewControllers.dropFirst())
|
|
viewControllers = [viewControllers.first!]
|
|
return removed
|
|
}
|
|
|
|
func pushViewController(_ vc: UIViewController, animated: Bool) {
|
|
isManuallyUpdating = true
|
|
defer { isManuallyUpdating = false }
|
|
viewControllers.append(vc)
|
|
updateViews()
|
|
scrollToEnd(animated: animated)
|
|
if animated {
|
|
let column = stackView.arrangedSubviews.last!
|
|
column.layer.opacity = 0
|
|
animateChanges {
|
|
column.layer.opacity = 1
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
private class ColumnView: UIView {
|
|
private unowned let owner: MultiColumnNavigationController
|
|
private let contentView = UIView()
|
|
private let navigationController: ColumnNavigationController
|
|
private var contentViewController: UIViewController!
|
|
|
|
init(owner: MultiColumnNavigationController, contentViewController: UIViewController, needsCloseButton: Bool) {
|
|
self.owner = owner
|
|
self.navigationController = ColumnNavigationController(owner: owner)
|
|
super.init(frame: .zero)
|
|
|
|
contentView.translatesAutoresizingMaskIntoConstraints = false
|
|
addSubview(contentView)
|
|
|
|
layer.shadowOpacity = 0.2
|
|
layer.shadowRadius = 8
|
|
layer.shadowOffset = .zero
|
|
contentView.layer.masksToBounds = false
|
|
contentView.layer.cornerRadius = 12.5
|
|
contentView.layer.cornerCurve = .continuous
|
|
contentView.layer.masksToBounds = true
|
|
|
|
NSLayoutConstraint.activate([
|
|
contentView.leadingAnchor.constraint(equalTo: leadingAnchor),
|
|
contentView.trailingAnchor.constraint(equalTo: trailingAnchor),
|
|
contentView.topAnchor.constraint(equalTo: topAnchor),
|
|
contentView.bottomAnchor.constraint(equalTo: bottomAnchor),
|
|
|
|
widthAnchor.constraint(equalToConstant: 400),
|
|
])
|
|
|
|
setContent(contentViewController, needsCloseButton: needsCloseButton)
|
|
}
|
|
|
|
required init?(coder: NSCoder) {
|
|
fatalError("init(coder:) has not been implemented")
|
|
}
|
|
|
|
func setContent(_ viewController: UIViewController, needsCloseButton: Bool) {
|
|
guard viewController !== contentViewController || viewController.parent !== navigationController else {
|
|
return
|
|
}
|
|
|
|
contentViewController?.removeViewAndController()
|
|
|
|
if navigationController.parent != owner {
|
|
navigationController.removeViewAndController()
|
|
|
|
owner.addChild(navigationController)
|
|
navigationController.didMove(toParent: owner)
|
|
navigationController.view.translatesAutoresizingMaskIntoConstraints = false
|
|
contentView.addSubview(navigationController.view)
|
|
NSLayoutConstraint.activate([
|
|
navigationController.view.leadingAnchor.constraint(equalTo: contentView.leadingAnchor),
|
|
navigationController.view.trailingAnchor.constraint(equalTo: contentView.trailingAnchor),
|
|
navigationController.view.topAnchor.constraint(equalTo: contentView.topAnchor),
|
|
navigationController.view.bottomAnchor.constraint(equalTo: contentView.bottomAnchor),
|
|
])
|
|
}
|
|
|
|
contentViewController = viewController
|
|
navigationController.setViewControllers([viewController], animated: false)
|
|
|
|
if needsCloseButton {
|
|
installCloseBarButton(navigationItem: viewController.navigationItem)
|
|
}
|
|
}
|
|
|
|
func willRemoveColumn() {
|
|
navigationController.removeViewAndController()
|
|
navigationController.setViewControllers([], animated: false)
|
|
removeCloseBarButton(navigationItem: contentViewController.navigationItem)
|
|
}
|
|
|
|
private func installCloseBarButton(navigationItem: UINavigationItem) {
|
|
let item = UIBarButtonItem(image: UIImage(systemName: "xmark"), style: .done, target: self, action: #selector(closeNavigationColumn))
|
|
item.accessibilityLabel = "Close Column"
|
|
if navigationItem.leftBarButtonItems != nil {
|
|
navigationItem.leftBarButtonItems!.insert(item, at: 0)
|
|
} else {
|
|
navigationItem.leftBarButtonItems = [item]
|
|
}
|
|
}
|
|
|
|
private func removeCloseBarButton(navigationItem: UINavigationItem) {
|
|
navigationItem.leftBarButtonItems = (navigationItem.leftBarButtonItems ?? []).filter {
|
|
$0.action != #selector(closeNavigationColumn)
|
|
}
|
|
}
|
|
|
|
@objc private func closeNavigationColumn() {
|
|
owner.closeColumn(contentViewController)
|
|
}
|
|
}
|
|
|
|
private class ColumnNavigationController: UINavigationController {
|
|
unowned let owner: MultiColumnNavigationController
|
|
|
|
init(owner: MultiColumnNavigationController) {
|
|
self.owner = owner
|
|
super.init(nibName: nil, bundle: nil)
|
|
}
|
|
|
|
required init?(coder aDecoder: NSCoder) {
|
|
fatalError("init(coder:) has not been implemented")
|
|
}
|
|
|
|
override func show(_ vc: UIViewController, sender: Any?) {
|
|
owner.show(vc, sender: sender)
|
|
}
|
|
}
|
|
|
|
private extension UIScrollView {
|
|
var adjustedLeadingContentInset: CGFloat {
|
|
if traitCollection.layoutDirection == .leftToRight {
|
|
adjustedContentInset.left
|
|
} else {
|
|
adjustedContentInset.right
|
|
}
|
|
}
|
|
|
|
var adjustedTrailingContentInset: CGFloat {
|
|
if traitCollection.layoutDirection == .leftToRight {
|
|
adjustedContentInset.right
|
|
} else {
|
|
adjustedContentInset.left
|
|
}
|
|
}
|
|
}
|