108 lines
4.1 KiB
Swift
108 lines
4.1 KiB
Swift
//
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// EnhancedTableViewController.swift
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// Tusker
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//
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// Created by Shadowfacts on 11/10/18.
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// Copyright © 2018 Shadowfacts. All rights reserved.
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//
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import UIKit
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import SafariServices
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class EnhancedTableViewController: UITableViewController {
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private var prevScrollToTopOffset: CGPoint? = nil
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private(set) var isCurrentlyScrollingToTop = false
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private var prevScrollViewContentOffset: CGPoint?
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private(set) var scrollViewDirection: CGFloat = 0
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// MARK: Scroll View Delegate
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override func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
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if let offset = prevScrollToTopOffset {
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tableView.setContentOffset(offset, animated: true)
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prevScrollToTopOffset = nil
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return false
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} else {
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prevScrollToTopOffset = tableView.contentOffset
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isCurrentlyScrollingToTop = true
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return true
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}
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}
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override func scrollViewDidScrollToTop(_ scrollView: UIScrollView) {
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isCurrentlyScrollingToTop = false
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// add one so it's not technically scrolled all the way to the top,
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// otherwise there's no way of detecting a status bar press to scroll back down
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tableView.contentOffset.y -= 0.5
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}
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override func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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prevScrollToTopOffset = nil
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}
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override func scrollViewDidScroll(_ scrollView: UIScrollView) {
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if let prev = prevScrollViewContentOffset {
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scrollViewDirection = scrollView.contentOffset.y - prev.y
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}
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prevScrollViewContentOffset = scrollView.contentOffset
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}
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// MARK: Table View Delegate
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override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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if let cell = tableView.cellForRow(at: indexPath) as? SelectableTableViewCell {
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cell.didSelectCell()
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}
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}
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}
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extension EnhancedTableViewController {
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override func tableView(_ tableView: UITableView, contextMenuConfigurationForRowAt indexPath: IndexPath, point: CGPoint) -> UIContextMenuConfiguration? {
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if let cell = tableView.cellForRow(at: indexPath) as? UITableViewCell & MenuPreviewProvider {
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let cellLocation = cell.convert(point, from: tableView)
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guard let (previewProvider, actionsProvider) = cell.getPreviewProviders(for: cellLocation, sourceViewController: self) else {
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return nil
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}
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let actionProvider: UIContextMenuActionProvider = { (_) in
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let suggested = self.getSuggestedContextMenuActions(tableView: tableView, indexPath: indexPath, point: point)
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return UIMenu(title: "", image: nil, identifier: nil, options: [], children: suggested + actionsProvider())
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}
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return UIContextMenuConfiguration(identifier: nil, previewProvider: previewProvider, actionProvider: actionProvider)
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} else {
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return nil
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}
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}
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// todo: replace this with the UIKit suggested actions, if possible
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@objc open func getSuggestedContextMenuActions(tableView: UITableView, indexPath: IndexPath, point: CGPoint) -> [UIAction] {
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return []
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}
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override func tableView(_ tableView: UITableView, willPerformPreviewActionForMenuWith configuration: UIContextMenuConfiguration, animator: UIContextMenuInteractionCommitAnimating) {
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if let viewController = animator.previewViewController {
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animator.preferredCommitStyle = .pop
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animator.addCompletion {
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if let customPresenting = viewController as? CustomPreviewPresenting {
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customPresenting.presentFromPreview(presenter: self)
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} else {
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self.show(viewController, sender: nil)
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}
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}
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}
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}
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}
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extension EnhancedTableViewController: TabBarScrollableViewController {
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func tabBarScrollToTop() {
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if scrollViewShouldScrollToTop(tableView) {
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let topOffset = CGPoint(x: 0, y: -tableView.adjustedContentInset.top)
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tableView.setContentOffset(topOffset, animated: true)
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scrollViewDidScrollToTop(tableView)
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}
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}
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}
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