504 lines
19 KiB
Swift
504 lines
19 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import UIKit
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import QuartzCore
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import GRDB
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import DifferenceKit
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import SessionUIKit
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import SignalUtilitiesKit
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public class DocumentTileViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {
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/// This should be larger than one screen size so we don't have to call it multiple times in rapid succession, but not
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/// so large that loading get's really chopping
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static let itemPageSize: Int = Int(11 * itemsPerPortraitRow)
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static let itemsPerPortraitRow: CGFloat = 4
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static let interItemSpacing: CGFloat = 2
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static let footerBarHeight: CGFloat = 40
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static let loadMoreHeaderHeight: CGFloat = 100
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private let viewModel: MediaGalleryViewModel
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private var hasLoadedInitialData: Bool = false
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private var didFinishInitialLayout: Bool = false
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private var isAutoLoadingNextPage: Bool = false
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private var currentTargetOffset: CGPoint?
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public var delegate: DocumentTileViewControllerDelegate?
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// MARK: - Initialization
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init(viewModel: MediaGalleryViewModel) {
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self.viewModel = viewModel
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Storage.shared.addObserver(viewModel.pagedDataObserver)
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super.init(nibName: nil, bundle: nil)
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}
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required public init?(coder aDecoder: NSCoder) {
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notImplemented()
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}
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deinit {
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NotificationCenter.default.removeObserver(self)
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}
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// MARK: - UI
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override public var supportedInterfaceOrientations: UIInterfaceOrientationMask {
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return .allButUpsideDown
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}
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lazy var tableView: UITableView = {
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let result = UITableView(frame: .zero, style: .grouped)
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result.backgroundColor = Colors.navigationBarBackground
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result.separatorStyle = .none
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result.showsVerticalScrollIndicator = false
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result.register(view: DocumentCell.self)
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result.delegate = self
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result.dataSource = self
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// Feels a bit weird to have content smashed all the way to the bottom edge.
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result.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: 20, right: 0)
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return result
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}()
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// MARK: - Lifecycle
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override public func viewDidLoad() {
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super.viewDidLoad()
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// Add a custom back button if this is the only view controller
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if self.navigationController?.viewControllers.first == self {
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let backButton = OWSViewController.createOWSBackButton(withTarget: self, selector: #selector(didPressDismissButton))
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self.navigationItem.leftBarButtonItem = backButton
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}
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ViewControllerUtilities.setUpDefaultSessionStyle(
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for: self,
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title: MediaStrings.document,
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hasCustomBackButton: false
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)
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view.addSubview(self.tableView)
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tableView.autoPin(toEdgesOf: view)
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// Notifications
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(applicationDidBecomeActive(_:)),
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name: UIApplication.didBecomeActiveNotification,
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object: nil
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)
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NotificationCenter.default.addObserver(
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self,
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selector: #selector(applicationDidResignActive(_:)),
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name: UIApplication.didEnterBackgroundNotification, object: nil
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)
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}
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public override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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startObservingChanges()
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}
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public override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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self.didFinishInitialLayout = true
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}
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public override func viewWillDisappear(_ animated: Bool) {
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super.viewWillDisappear(animated)
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stopObservingChanges()
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}
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@objc func applicationDidBecomeActive(_ notification: Notification) {
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startObservingChanges()
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}
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@objc func applicationDidResignActive(_ notification: Notification) {
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stopObservingChanges()
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}
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// MARK: - Updating
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private func performInitialScrollIfNeeded() {
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// Ensure this hasn't run before and that we have data (The 'galleryData' will always
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// contain something as the 'empty' state is a section within 'galleryData')
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guard !self.didFinishInitialLayout && self.hasLoadedInitialData else { return }
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// If we have a focused item then we want to scroll to it
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guard let focusedIndexPath: IndexPath = self.viewModel.focusedIndexPath else { return }
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Logger.debug("scrolling to focused item at indexPath: \(focusedIndexPath)")
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self.view.layoutIfNeeded()
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self.tableView.scrollToRow(at: focusedIndexPath, at: .middle, animated: false)
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// Now that the data has loaded we need to check if either of the "load more" sections are
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// visible and trigger them if so
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//
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// Note: We do it this way as we want to trigger the load behaviour for the first section
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// if it has one before trying to trigger the load behaviour for the last section
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self.autoLoadNextPageIfNeeded()
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}
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private func autoLoadNextPageIfNeeded() {
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guard !self.isAutoLoadingNextPage else { return }
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self.isAutoLoadingNextPage = true
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DispatchQueue.main.asyncAfter(deadline: .now() + PagedData.autoLoadNextPageDelay) { [weak self] in
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self?.isAutoLoadingNextPage = false
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// Note: We sort the headers as we want to prioritise loading newer pages over older ones
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let sortedVisibleIndexPaths: [IndexPath] = (self?.tableView.indexPathsForVisibleRows ?? []).sorted()
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for headerIndexPath in sortedVisibleIndexPaths {
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let section: MediaGalleryViewModel.SectionModel? = self?.viewModel.galleryData[safe: headerIndexPath.section]
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switch section?.model {
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case .loadNewer, .loadOlder:
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// Attachments are loaded in descending order so 'loadOlder' actually corresponds with
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// 'pageAfter' in this case
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self?.viewModel.pagedDataObserver?.load(section?.model == .loadOlder ?
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.pageAfter :
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.pageBefore
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)
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return
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default: continue
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}
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}
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}
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}
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private func startObservingChanges() {
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// Start observing for data changes (will callback on the main thread)
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self.viewModel.onGalleryChange = { [weak self] updatedGalleryData in
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self?.handleUpdates(updatedGalleryData)
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}
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}
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private func stopObservingChanges() {
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// Note: The 'pagedDataObserver' will continue to get changes but
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// we don't want to trigger any UI updates
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self.viewModel.onGalleryChange = nil
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}
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private func handleUpdates(_ updatedGalleryData: [MediaGalleryViewModel.SectionModel]) {
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// Ensure the first load runs without animations (if we don't do this the cells will animate
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// in from a frame of CGRect.zero)
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guard hasLoadedInitialData else {
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self.hasLoadedInitialData = true
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self.viewModel.updateGalleryData(updatedGalleryData)
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UIView.performWithoutAnimation {
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self.tableView.reloadData()
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self.performInitialScrollIfNeeded()
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}
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return
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}
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let isInsertingAtTop: Bool = {
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let oldFirstSectionIsLoadMore: Bool = (
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self.viewModel.galleryData.first?.model == .loadNewer ||
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self.viewModel.galleryData.first?.model == .loadOlder
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)
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let oldTargetSectionIndex: Int = (oldFirstSectionIsLoadMore ? 1 : 0)
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guard
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let newTargetSectionIndex = updatedGalleryData
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.firstIndex(where: { $0.model == self.viewModel.galleryData[safe: oldTargetSectionIndex]?.model }),
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let oldFirstItem: MediaGalleryViewModel.Item = self.viewModel.galleryData[safe: oldTargetSectionIndex]?.elements.first,
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let newFirstItemIndex = updatedGalleryData[safe: newTargetSectionIndex]?.elements.firstIndex(of: oldFirstItem)
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else { return false }
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return (newTargetSectionIndex > oldTargetSectionIndex || newFirstItemIndex > 0)
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}()
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CATransaction.begin()
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if isInsertingAtTop { CATransaction.setDisableActions(true) }
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self.tableView.reload(
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using: StagedChangeset(source: self.viewModel.galleryData, target: updatedGalleryData),
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with: .automatic,
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interrupt: { $0.changeCount > MediaTileViewController.itemPageSize }
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) { [weak self] updatedData in
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self?.viewModel.updateGalleryData(updatedData)
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}
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CATransaction.setCompletionBlock { [weak self] in
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// If one of the "load more" sections is still visible once the animation completes then
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// trigger another "load more" (after a small delay to minimize animation bugginess)
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self?.autoLoadNextPageIfNeeded()
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}
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CATransaction.commit()
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}
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// MARK: - Interactions
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@objc public func didPressDismissButton() {
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let presentedNavController: UINavigationController? = (self.presentingViewController as? UINavigationController)
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let mediaPageViewController: MediaPageViewController? = (
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(presentedNavController?.viewControllers.last as? MediaPageViewController) ??
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(self.presentingViewController as? MediaPageViewController)
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)
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// If the album was presented from a 'MediaPageViewController' and it has no more data (ie.
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// all album items had been deleted) then dismiss to the screen before that one
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guard mediaPageViewController?.viewModel.albumData.isEmpty != true else {
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presentedNavController?.presentingViewController?.dismiss(animated: true, completion: nil)
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return
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}
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dismiss(animated: true, completion: nil)
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}
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// MARK: - UITableViewDataSource
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public func numberOfSections(in tableView: UITableView) -> Int {
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return self.viewModel.galleryData.count
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}
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public func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
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return self.viewModel.galleryData[section].elements.count
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}
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public func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
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let cell: DocumentCell = tableView.dequeue(type: DocumentCell.self, for: indexPath)
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cell.update(with: self.viewModel.galleryData[indexPath.section].elements[indexPath.row])
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return cell
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}
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// MARK: - UITableViewDelegate
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public func tableView(_ tableView: UITableView, viewForHeaderInSection section: Int) -> UIView? {
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let section: MediaGalleryViewModel.SectionModel = self.viewModel.galleryData[section]
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switch section.model {
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case .emptyGallery, .loadOlder, .loadNewer:
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let headerView: DocumentStaticHeaderView = DocumentStaticHeaderView()
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headerView.configure(
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title: {
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switch section.model {
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case .emptyGallery: return "DOCUMENT_TILES_EMPTY_DOCUMENT".localized()
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case .loadOlder: return "DOCUMENT_TILES_LOADING_OLDER_LABEL".localized()
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case .loadNewer: return "DOCUMENT_TILES_LOADING_MORE_RECENT_LABEL".localized()
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case .galleryMonth: return "" // Impossible case
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}
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}()
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)
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return headerView
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case .galleryMonth(let date):
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let headerView: DocumentSectionHeaderView = DocumentSectionHeaderView()
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headerView.configure(title: date.localizedString)
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return headerView
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}
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}
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public func tableView(_ tableView: UITableView, heightForHeaderInSection section: Int) -> CGFloat {
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let section: MediaGalleryViewModel.SectionModel = self.viewModel.galleryData[section]
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switch section.model {
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case .emptyGallery, .loadOlder, .loadNewer:
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return MediaTileViewController.loadMoreHeaderHeight
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case .galleryMonth:
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return 50
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}
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}
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public func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
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tableView.deselectRow(at: indexPath, animated: false)
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let attachment: Attachment = self.viewModel.galleryData[indexPath.section].elements[indexPath.row].attachment
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guard let originalFilePath: String = attachment.originalFilePath else { return }
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let fileUrl: URL = URL(fileURLWithPath: originalFilePath)
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// Open a preview of the document for text, pdf or microsoft files
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if
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attachment.isText ||
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attachment.isMicrosoftDoc ||
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attachment.contentType == OWSMimeTypeApplicationPdf
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{
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delegate?.preview(fileUrl: fileUrl)
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return
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}
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// Otherwise share the file
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delegate?.share(fileUrl: fileUrl)
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}
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}
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// MARK: - View
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class DocumentCell: UITableViewCell {
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// MARK: - Initialization
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override init(style: UITableViewCell.CellStyle, reuseIdentifier: String?) {
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super.init(style: style, reuseIdentifier: reuseIdentifier)
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setUpViewHierarchy()
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setupLayout()
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}
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required init?(coder: NSCoder) {
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super.init(coder: coder)
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setUpViewHierarchy()
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setupLayout()
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}
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// MARK: - UI
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private static let iconImageViewSize: CGSize = CGSize(width: 31, height: 40)
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private let iconImageView: UIImageView = {
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let result: UIImageView = UIImageView(image: #imageLiteral(resourceName: "File").withRenderingMode(.alwaysTemplate))
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result.translatesAutoresizingMaskIntoConstraints = false
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result.tintColor = Colors.text
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return result
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}()
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private let titleLabel: UILabel = {
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let result: UILabel = UILabel()
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result.translatesAutoresizingMaskIntoConstraints = false
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result.setContentHuggingPriority(.defaultHigh, for: .horizontal)
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result.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
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result.font = .boldSystemFont(ofSize: Values.smallFontSize)
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result.textColor = Colors.text
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result.lineBreakMode = .byTruncatingTail
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return result
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}()
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private let detailLabel: UILabel = {
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let result: UILabel = UILabel()
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result.translatesAutoresizingMaskIntoConstraints = false
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result.setContentHuggingPriority(.defaultHigh, for: .horizontal)
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result.setContentCompressionResistancePriority(.defaultLow, for: .horizontal)
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result.font = .systemFont(ofSize: Values.smallFontSize)
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result.textColor = Colors.text
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result.lineBreakMode = .byTruncatingTail
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return result
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}()
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private func setUpViewHierarchy() {
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backgroundColor = Colors.cellBackground
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selectedBackgroundView = UIView()
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selectedBackgroundView?.backgroundColor = Colors.cellSelected
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contentView.addSubview(iconImageView)
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contentView.addSubview(titleLabel)
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contentView.addSubview(detailLabel)
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}
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// MARK: - Layout
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private func setupLayout() {
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NSLayoutConstraint.activate([
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contentView.heightAnchor.constraint(equalToConstant: 68),
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iconImageView.leftAnchor.constraint(equalTo: contentView.leftAnchor, constant: Values.mediumSpacing),
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iconImageView.centerYAnchor.constraint(equalTo: contentView.centerYAnchor),
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iconImageView.widthAnchor.constraint(equalToConstant: Self.iconImageViewSize.width),
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iconImageView.heightAnchor.constraint(equalToConstant: Self.iconImageViewSize.height),
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titleLabel.leftAnchor.constraint(equalTo: iconImageView.rightAnchor, constant: Values.mediumSpacing),
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titleLabel.rightAnchor.constraint(lessThanOrEqualTo: contentView.rightAnchor, constant: -Values.mediumSpacing),
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titleLabel.topAnchor.constraint(equalTo: iconImageView.topAnchor),
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detailLabel.leftAnchor.constraint(equalTo: iconImageView.rightAnchor, constant: Values.mediumSpacing),
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detailLabel.rightAnchor.constraint(lessThanOrEqualTo: contentView.rightAnchor, constant: -Values.mediumSpacing),
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detailLabel.bottomAnchor.constraint(equalTo: iconImageView.bottomAnchor),
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])
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}
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// MARK: - Content
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func update(with item: MediaGalleryViewModel.Item) {
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let attachment = item.attachment
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titleLabel.text = attachment.sourceFilename ?? "File"
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detailLabel.text = "\(OWSFormat.formatFileSize(UInt(attachment.byteCount)))"
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}
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}
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class DocumentSectionHeaderView: UIView {
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let label: UILabel
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override init(frame: CGRect) {
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label = UILabel()
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label.textColor = Colors.text
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let blurEffect = UIBlurEffect(style: .dark)
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let blurEffectView = UIVisualEffectView(effect: blurEffect)
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blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
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super.init(frame: frame)
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self.backgroundColor = isLightMode ? Colors.cellBackground : UIColor.ows_black.withAlphaComponent(OWSNavigationBar.backgroundBlurMutingFactor)
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self.addSubview(blurEffectView)
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self.addSubview(label)
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blurEffectView.autoPinEdgesToSuperviewEdges()
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blurEffectView.isHidden = isLightMode
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label.autoPinEdge(toSuperviewMargin: .trailing)
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label.autoPinEdge(toSuperviewMargin: .leading)
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label.autoVCenterInSuperview()
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}
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@available(*, unavailable, message: "Unimplemented")
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required init?(coder aDecoder: NSCoder) {
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notImplemented()
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}
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public func configure(title: String) {
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self.label.text = title
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}
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}
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class DocumentStaticHeaderView: UIView {
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let label = UILabel()
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override init(frame: CGRect) {
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super.init(frame: frame)
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addSubview(label)
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label.textColor = Colors.text
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label.textAlignment = .center
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label.numberOfLines = 0
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label.autoPinEdgesToSuperviewMargins(with: UIEdgeInsets(top: 0, leading: Values.largeSpacing, bottom: 0, trailing: Values.largeSpacing))
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}
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@available(*, unavailable, message: "Unimplemented")
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required public init?(coder aDecoder: NSCoder) {
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notImplemented()
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}
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public func configure(title: String) {
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self.label.text = title
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}
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}
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// MARK: - DocumentTitleViewControllerDelegate
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public protocol DocumentTileViewControllerDelegate: AnyObject {
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func share(fileUrl: URL)
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func preview(fileUrl: URL)
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}
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