123 lines
4.4 KiB
Swift
123 lines
4.4 KiB
Swift
//
|
|
// AutocompleteViewController.swift
|
|
// App
|
|
//
|
|
// Created by James Magahern on 9/21/20.
|
|
//
|
|
|
|
import UIKit
|
|
|
|
protocol AutocompleteViewControllerDelegate: AnyObject {
|
|
func autocompleteController(_: AutocompleteViewController, didSelectHistoryItem: HistoryItem)
|
|
}
|
|
|
|
class AutocompleteViewController: UIViewController, UICollectionViewDelegate
|
|
{
|
|
public var historyItems: [HistoryItem] = [] {
|
|
didSet {
|
|
var snapshot = dataSource.snapshot()
|
|
snapshot.deleteAllItems()
|
|
snapshot.appendSections([ .HistoryItems ])
|
|
snapshot.appendItems(historyItems, toSection: .HistoryItems)
|
|
dataSource.apply(snapshot, animatingDifferences: false)
|
|
}
|
|
}
|
|
|
|
public weak var delegate: AutocompleteViewControllerDelegate?
|
|
|
|
private enum Section: Int {
|
|
case HistoryItems
|
|
}
|
|
|
|
override var canBecomeFirstResponder: Bool { true }
|
|
|
|
public let collectionView: UICollectionView
|
|
private let dataSource: UICollectionViewDiffableDataSource<Section, HistoryItem>
|
|
|
|
init() {
|
|
let listConfiguration = UICollectionLayoutListConfiguration(appearance: .insetGrouped)
|
|
let listLayout = UICollectionViewCompositionalLayout.list(using: listConfiguration)
|
|
collectionView = UICollectionView(frame: .zero, collectionViewLayout: listLayout)
|
|
|
|
let cellRegistry = UICollectionView.CellRegistration<UICollectionViewListCell, HistoryItem> { (cell, indexPath, item) in
|
|
var config = cell.defaultContentConfiguration()
|
|
config.text = item.title
|
|
config.secondaryText = item.url.absoluteString
|
|
cell.contentConfiguration = config
|
|
}
|
|
|
|
dataSource = UICollectionViewDiffableDataSource<Section, HistoryItem>(collectionView: collectionView, cellProvider:
|
|
{ (collectionView, indexPath, item) -> UICollectionViewCell? in
|
|
collectionView.dequeueConfiguredReusableCell(using: cellRegistry, for: indexPath, item: item)
|
|
})
|
|
|
|
super.init(nibName: nil, bundle: nil)
|
|
|
|
collectionView.delegate = self
|
|
view.backgroundColor = .systemBackground
|
|
}
|
|
|
|
required init?(coder: NSCoder) { fatalError("init(coder:) has not been implemented") }
|
|
|
|
override func loadView() {
|
|
self.view = collectionView
|
|
}
|
|
|
|
override var keyCommands: [UIKeyCommand]? {
|
|
[
|
|
UIKeyCommand(action: #selector(self.selectNextItem), input: UIKeyCommand.inputDownArrow),
|
|
UIKeyCommand(action: #selector(self.selectPreviousItem), input: UIKeyCommand.inputUpArrow),
|
|
UIKeyCommand(action: #selector(self.commitSelectedItem), input: "\r"), // this is stupid...
|
|
]
|
|
}
|
|
|
|
override func becomeFirstResponder() -> Bool {
|
|
let result = super.becomeFirstResponder()
|
|
if result {
|
|
let firstIndex = IndexPath(row: 0, section: 0)
|
|
collectionView.selectItem(at: firstIndex, animated: false, scrollPosition: .top)
|
|
}
|
|
|
|
return result
|
|
}
|
|
|
|
private func selectItem(inDirection direction: Int) {
|
|
if let selectedIndex = collectionView.indexPathsForSelectedItems?.first {
|
|
let nextRow = (selectedIndex.row + direction)
|
|
if nextRow < dataSource.snapshot().numberOfItems && nextRow >= 0 {
|
|
let nextIndexPath = IndexPath(row: nextRow, section: 0)
|
|
collectionView.selectItem(at: nextIndexPath, animated: false, scrollPosition: .centeredVertically)
|
|
}
|
|
}
|
|
}
|
|
|
|
@objc
|
|
private func selectNextItem(_ sender: Any?) {
|
|
selectItem(inDirection: 1)
|
|
}
|
|
|
|
@objc
|
|
private func selectPreviousItem(_ sender: Any?) {
|
|
selectItem(inDirection: -1)
|
|
}
|
|
|
|
@objc
|
|
private func commitSelectedItem(_ sender: Any?) {
|
|
if let selectedIndex = collectionView.indexPathsForSelectedItems?.first,
|
|
let item = dataSource.itemIdentifier(for: selectedIndex)
|
|
{
|
|
delegate?.autocompleteController(self, didSelectHistoryItem: item)
|
|
}
|
|
}
|
|
|
|
// MARK: UICollectionViewDelegate
|
|
|
|
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
|
|
collectionView.deselectItem(at: indexPath, animated: true)
|
|
|
|
if let item = dataSource.itemIdentifier(for: indexPath) {
|
|
delegate?.autocompleteController(self, didSelectHistoryItem: item)
|
|
}
|
|
}
|
|
}
|