mirror of
https://github.com/Novaloop-AG/element-x-ios.git
synced 2026-11-04 10:33:45 +00:00
Moved timeline views to the room screen folder. Extracted timeline code into its own component. Added more preview providers.
This commit is contained in:
Stefan Ceriu
@@ -15,230 +15,15 @@
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//
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import SwiftUI
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import Introspect
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import Combine
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struct RoomScreen: View {
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@State private var tableViewObserver: TableViewObserver = TableViewObserver()
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@State private var timelineItems: [RoomTimelineViewProvider] = []
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@State private var hasPendingChanges = false
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@State private var text: String = ""
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@ObservedObject var context: RoomScreenViewModel.Context
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var body: some View {
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// The observer behaves differently when not in an reader
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ScrollViewReader { _ in
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List {
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HStack {
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Spacer()
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ProgressView()
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.opacity(context.viewState.isBackPaginating ? 1.0 : 0.0)
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.animation(.default, value: context.viewState.isBackPaginating)
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Spacer()
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}
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// No idea why previews don't work otherwise
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ForEach(isPreview ? context.viewState.items : timelineItems) { timelineItem in
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timelineItem
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.listRowSeparator(.hidden)
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.onAppear {
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context.send(viewAction: .itemAppeared(id: timelineItem.id))
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}
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.onDisappear {
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context.send(viewAction: .itemDisappeared(id: timelineItem.id))
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}
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.environment(\.openURL, OpenURLAction { url in
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context.send(viewAction: .linkClicked(url: url))
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return .systemAction
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})
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}
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}
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.listStyle(.plain)
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TimelineView(context: context)
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.navigationTitle(context.viewState.roomTitle)
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.environment(\.defaultMinListRowHeight, 0.0)
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.navigationBarTitleDisplayMode(.inline)
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.introspectTableView { tableView in
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if tableView == tableViewObserver.tableView {
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return
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}
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tableViewObserver = TableViewObserver(tableView: tableView,
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topDetectionOffset: (tableView.bounds.size.height / 3.0))
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// Check if there are enough items. Otherwise ask for more
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attemptBackPagination()
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}
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.onReceive(tableViewObserver.scrollViewDidReachTop, perform: {
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if context.viewState.isBackPaginating {
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return
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}
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attemptBackPagination()
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})
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.onChange(of: context.viewState.items) { _ in
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// Don't update the list while moving
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if tableViewObserver.isDecelerating || tableViewObserver.isTracking {
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hasPendingChanges = true
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return
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}
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tableViewObserver.saveCurrentOffset()
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timelineItems = context.viewState.items
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}
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.onReceive(tableViewObserver.scrollViewDidRest, perform: {
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if hasPendingChanges == false {
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return
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}
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tableViewObserver.saveCurrentOffset()
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timelineItems = context.viewState.items
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hasPendingChanges = false
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})
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.onChange(of: timelineItems, perform: { _ in
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tableViewObserver.restoreSavedOffset()
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// Check if there are enough items. Otherwise ask for more
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attemptBackPagination()
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})
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}
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}
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private func attemptBackPagination() {
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if context.viewState.isBackPaginating {
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return
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}
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if tableViewObserver.isTopVisible == false {
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return
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}
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context.send(viewAction: .loadPreviousPage)
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}
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private var isPreview: Bool {
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#if DEBUG
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return ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"
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#else
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return false
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#endif
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}
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}
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private class TableViewObserver: NSObject, UITableViewDelegate {
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private enum ContentOffsetDetails {
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case topOffset(previousVisibleIndexPath: IndexPath, previousItemCount: Int)
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case bottomOffset
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}
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private let topDetectionOffset: CGFloat
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private var isAtTop: Bool = false
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private var offsetDetails: ContentOffsetDetails?
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private(set) var tableView: UITableView?
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let scrollViewDidRest = PassthroughSubject<Void, Never>()
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let scrollViewDidReachTop = PassthroughSubject<Void, Never>()
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override init() {
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self.topDetectionOffset = 0.0
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}
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init(tableView: UITableView, topDetectionOffset: CGFloat) {
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self.tableView = tableView
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self.topDetectionOffset = topDetectionOffset
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super.init()
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tableView.delegate = self
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}
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func saveCurrentOffset() {
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guard let tableView = tableView,
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tableView.numberOfSections > 0 else {
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return
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}
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if isBottomVisible {
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offsetDetails = .bottomOffset
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} else if isTopVisible {
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if let topIndexPath = tableView.indexPathsForVisibleRows?.first {
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offsetDetails = .topOffset(previousVisibleIndexPath: topIndexPath,
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previousItemCount: tableView.numberOfRows(inSection: 0))
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}
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}
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}
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func restoreSavedOffset() {
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defer {
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offsetDetails = nil
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}
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guard let tableView = tableView,
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tableView.numberOfSections > 0 else {
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return
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}
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let currentItemCount = tableView.numberOfRows(inSection: 0)
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switch offsetDetails {
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case .bottomOffset:
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tableView.scrollToRow(at: .init(row: max(0, currentItemCount - 1), section: 0), at: .bottom, animated: false)
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case .topOffset(let indexPath, let previousItemCount):
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let row = indexPath.row + max(0, (currentItemCount - previousItemCount))
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if row < currentItemCount {
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tableView.scrollToRow(at: .init(row: row, section: 0), at: .top, animated: false)
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}
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case .none:
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break
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}
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}
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var isTracking: Bool {
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self.tableView?.isTracking == true
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}
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var isDecelerating: Bool {
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self.tableView?.isDecelerating == true
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}
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var isTopVisible: Bool {
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guard let scrollView = tableView else {
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return false
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}
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return (scrollView.contentOffset.y + scrollView.adjustedContentInset.top) <= topDetectionOffset
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}
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// MARK: - UIScrollViewDelegate
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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let isTopVisible = isTopVisible
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if isTopVisible && isAtTop != isTopVisible {
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scrollViewDidReachTop.send(())
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}
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isAtTop = isTopVisible
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}
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func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
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scrollViewDidRest.send(())
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}
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func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerating: Bool) {
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if decelerating == false {
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scrollViewDidRest.send(())
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}
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}
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// MARK: - Private
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private var isBottomVisible: Bool {
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guard let scrollView = tableView else {
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return false
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}
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return (scrollView.contentOffset.y) >= (scrollView.contentSize.height - scrollView.frame.size.height)
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}
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}
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@@ -250,6 +35,8 @@ struct RoomScreen_Previews: PreviewProvider {
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timelineViewFactory: RoomTimelineViewFactory(),
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roomName: "Preview room")
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RoomScreen(context: viewModel.context)
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NavigationView {
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RoomScreen(context: viewModel.context)
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}
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}
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}
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@@ -0,0 +1,50 @@
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//
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// EmoteRoomTimelineView.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 11/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import SwiftUI
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struct EmoteRoomTimelineView: View {
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let timelineItem: EmoteRoomTimelineItem
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var body: some View {
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VStack(alignment: .leading) {
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EventBasedTimelineView(timelineItem: timelineItem)
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HStack(alignment: .top) {
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Image(systemName: "face.dashed").padding(.top, 1.0)
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if let attributedComponents = timelineItem.attributedComponents {
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FormattedBodyText(attributedComponents: attributedComponents)
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} else {
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Text(timelineItem.text)
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}
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}
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}
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.id(timelineItem.id)
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}
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}
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struct EmoteRoomTimelineView_Previews: PreviewProvider {
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static var previews: some View {
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VStack(spacing: 20.0) {
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let timelineItem = EmoteRoomTimelineItem(id: UUID().uuidString,
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text: "Short loin ground round tongue hamburger, fatback salami shoulder. Beef turkey sausage kielbasa strip steak. Alcatra capicola pig tail pancetta chislic.",
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timestamp: "Now",
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shouldShowSenderDetails: true,
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senderId: "Bob")
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EmoteRoomTimelineView(timelineItem: timelineItem)
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let timelineItem = EmoteRoomTimelineItem(id: UUID().uuidString,
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text: "Some other text",
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timestamp: "Later",
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shouldShowSenderDetails: true,
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senderId: "Anne")
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EmoteRoomTimelineView(timelineItem: timelineItem)
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}
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.padding()
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}
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}
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@@ -0,0 +1,71 @@
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//
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// EventBasedTimelineView.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 18/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import SwiftUI
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struct EventBasedTimelineView: View {
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let timelineItem: EventBasedTimelineItemProtocol
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var body: some View {
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if timelineItem.shouldShowSenderDetails {
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HStack {
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avatar
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Text(timelineItem.senderDisplayName ?? timelineItem.senderId)
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.font(.footnote)
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.bold()
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Text(timelineItem.timestamp)
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.font(.footnote)
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}
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}
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}
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@ViewBuilder private var avatar: some View {
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ZStack(alignment: .center) {
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if let avatar = timelineItem.senderAvatar {
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Image(uiImage: avatar)
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.resizable()
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.scaledToFill()
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.overlay(Circle().stroke(Color.elementGreen))
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} else {
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PlaceholderAvatarImage(firstCharacter: String(firstLetter))
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}
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}
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.clipShape(Circle())
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.frame(width: 24.0, height: 24.0)
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}
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private var firstLetter: String {
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if let senderDisplayName = timelineItem.senderDisplayName {
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return senderDisplayName.prefix(1).uppercased()
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} else {
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return timelineItem.senderId.prefix(2).suffix(1).uppercased()
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}
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}
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}
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struct EventBasedTimelineView_Previews: PreviewProvider {
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static var previews: some View {
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VStack(spacing: 20.0) {
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let timelineItem = TextRoomTimelineItem(id: UUID().uuidString,
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text: "Short loin ground round tongue hamburger, fatback salami shoulder. Beef turkey sausage kielbasa strip steak. Alcatra capicola pig tail pancetta chislic.",
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timestamp: "Now",
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shouldShowSenderDetails: true,
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senderId: "Bob")
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EventBasedTimelineView(timelineItem: timelineItem)
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let timelineItem = TextRoomTimelineItem(id: UUID().uuidString,
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text: "Some other text",
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timestamp: "Later",
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shouldShowSenderDetails: true,
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senderId: "Anne")
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EventBasedTimelineView(timelineItem: timelineItem)
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}
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.padding()
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}
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}
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@@ -0,0 +1,56 @@
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//
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// FormattedBodyText.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 24/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import SwiftUI
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struct FormattedBodyText: View {
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let attributedComponents: [AttributedStringBuilderComponent]
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var body: some View {
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VStack(alignment: .leading, spacing: 0.0) {
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ForEach(attributedComponents, id: \.self) { component in
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if component.isBlockquote {
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HStack(spacing: 4.0) {
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Rectangle()
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.foregroundColor(Color.red)
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.frame(width: 4.0)
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Text(component.attributedString)
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.fixedSize(horizontal: false, vertical: true)
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}
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} else {
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Text(component.attributedString)
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.fixedSize(horizontal: false, vertical: true)
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}
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}
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}
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.tint(.elementGreen)
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}
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}
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struct FormattedBodyText_Previews: PreviewProvider {
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static var previews: some View {
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let htmlString = """
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Text before blockquote
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<blockquote>
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<b>bold</b> <i>italic</i>
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</blockquote>
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Text after blockquote
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"""
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let attributedStringBuilder = AttributedStringBuilder()
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let attributedString = attributedStringBuilder.fromHTML(htmlString)
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if let components = attributedStringBuilder.blockquoteCoalescedComponentsFrom(attributedString) {
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VStack {
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FormattedBodyText(attributedComponents: components)
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.fixedSize()
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}
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}
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}
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}
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@@ -0,0 +1,58 @@
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//
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// ImageRoomTimelineView.swift
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// ElementX
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//
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// Created by Stefan Ceriu on 11/03/2022.
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// Copyright © 2022 Element. All rights reserved.
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//
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import Foundation
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import SwiftUI
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struct ImageRoomTimelineView: View {
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let timelineItem: ImageRoomTimelineItem
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var body: some View {
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if let image = timelineItem.image {
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VStack(alignment: .leading) {
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EventBasedTimelineView(timelineItem: timelineItem)
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Text(timelineItem.text)
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Image(uiImage: image)
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.resizable()
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.scaledToFit()
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}
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} else {
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VStack(alignment: .center) {
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HStack {
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Text(timelineItem.text)
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Spacer()
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}
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ProgressView("Loading")
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}
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}
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}
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}
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struct ImageRoomTimelineView_Previews: PreviewProvider {
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static var previews: some View {
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VStack {
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let timelineItem = ImageRoomTimelineItem(id: UUID().uuidString,
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text: "Some image",
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timestamp: "Now",
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shouldShowSenderDetails: false,
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senderId: "Bob",
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url: nil,
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image: UIImage(systemName: "photo"))
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ImageRoomTimelineView(timelineItem: timelineItem)
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let timelineItem = ImageRoomTimelineItem(id: UUID().uuidString,
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text: "Some other image",
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timestamp: "Now",
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shouldShowSenderDetails: false,
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senderId: "Bob",
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url: nil,
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image: nil)
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ImageRoomTimelineView(timelineItem: timelineItem)
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}
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}
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}
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@@ -0,0 +1,50 @@
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//
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// NoticeRoomTimelineView.swift
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// ElementX
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//
|
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// Created by Stefan Ceriu on 11/03/2022.
|
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// Copyright © 2022 Element. All rights reserved.
|
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//
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import Foundation
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import SwiftUI
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struct NoticeRoomTimelineView: View {
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let timelineItem: NoticeRoomTimelineItem
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var body: some View {
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VStack(alignment: .leading) {
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EventBasedTimelineView(timelineItem: timelineItem)
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HStack(alignment: .top) {
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Image(systemName: "exclamationmark.bubble").padding(.top, 2.0)
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if let attributedComponents = timelineItem.attributedComponents {
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FormattedBodyText(attributedComponents: attributedComponents)
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} else {
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Text(timelineItem.text)
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}
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}
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}
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.id(timelineItem.id)
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}
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}
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struct NoticeRoomTimelineView_Previews: PreviewProvider {
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static var previews: some View {
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VStack(spacing: 20.0) {
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let timelineItem = NoticeRoomTimelineItem(id: UUID().uuidString,
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text: "Short loin ground round tongue hamburger, fatback salami shoulder. Beef turkey sausage kielbasa strip steak. Alcatra capicola pig tail pancetta chislic.",
|
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timestamp: "Now",
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shouldShowSenderDetails: true,
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senderId: "Bob")
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NoticeRoomTimelineView(timelineItem: timelineItem)
|
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|
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let timelineItem = NoticeRoomTimelineItem(id: UUID().uuidString,
|
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text: "Some other text",
|
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timestamp: "Later",
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shouldShowSenderDetails: true,
|
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senderId: "Anne")
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NoticeRoomTimelineView(timelineItem: timelineItem)
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}
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||||
.padding()
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||||
}
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}
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||||
@@ -0,0 +1,43 @@
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//
|
||||
// Copyright 2022 New Vector Ltd
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
//
|
||||
|
||||
import SwiftUI
|
||||
|
||||
struct PlaceholderAvatarImage: View {
|
||||
|
||||
let firstCharacter: String
|
||||
|
||||
var body: some View {
|
||||
ZStack {
|
||||
Color(.sRGB, red: 0.05, green: 0.74, blue: 0.55, opacity: 1.0)
|
||||
Text(firstCharacter)
|
||||
.padding(4)
|
||||
.foregroundColor(.white)
|
||||
// Make the text resizable (i.e. Make it large and then allow it to scale down)
|
||||
.font(.system(size: 200))
|
||||
.minimumScaleFactor(0.001)
|
||||
}
|
||||
.aspectRatio(1, contentMode: .fill)
|
||||
}
|
||||
}
|
||||
|
||||
struct PlaceholderAvatarImage_Previews: PreviewProvider {
|
||||
static var previews: some View {
|
||||
PlaceholderAvatarImage(firstCharacter: "X")
|
||||
.clipShape(Circle())
|
||||
.frame(width: 150, height: 100)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,51 @@
|
||||
//
|
||||
// SeparatorRoomTimelineView.swift
|
||||
// ElementX
|
||||
//
|
||||
// Created by Stefan Ceriu on 11/03/2022.
|
||||
// Copyright © 2022 Element. All rights reserved.
|
||||
//
|
||||
|
||||
import Foundation
|
||||
import SwiftUI
|
||||
|
||||
struct SeparatorRoomTimelineView: View {
|
||||
let timelineItem: SeparatorRoomTimelineItem
|
||||
|
||||
var body: some View {
|
||||
LabelledDivider(label: timelineItem.text)
|
||||
.id(timelineItem.id)
|
||||
}
|
||||
}
|
||||
|
||||
struct LabelledDivider: View {
|
||||
let label: String
|
||||
let color: Color
|
||||
|
||||
init(label: String, color: Color = .gray) {
|
||||
self.label = label
|
||||
self.color = color
|
||||
}
|
||||
|
||||
var body: some View {
|
||||
HStack {
|
||||
line
|
||||
Text(label)
|
||||
.foregroundColor(color)
|
||||
.fixedSize()
|
||||
line
|
||||
}
|
||||
}
|
||||
|
||||
var line: some View {
|
||||
VStack { Divider().background(color) }
|
||||
}
|
||||
}
|
||||
|
||||
struct SeparatorRoomTimelineView_Previews: PreviewProvider {
|
||||
static var previews: some View {
|
||||
let item = SeparatorRoomTimelineItem(id: UUID().uuidString, text: "This is a separator")
|
||||
|
||||
SeparatorRoomTimelineView(timelineItem: item)
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,47 @@
|
||||
//
|
||||
// TextRoomTimelineView.swift
|
||||
// ElementX
|
||||
//
|
||||
// Created by Stefan Ceriu on 11/03/2022.
|
||||
// Copyright © 2022 Element. All rights reserved.
|
||||
//
|
||||
|
||||
import Foundation
|
||||
import SwiftUI
|
||||
|
||||
struct TextRoomTimelineView: View {
|
||||
let timelineItem: TextRoomTimelineItem
|
||||
|
||||
var body: some View {
|
||||
VStack(alignment: .leading) {
|
||||
EventBasedTimelineView(timelineItem: timelineItem)
|
||||
if let attributedComponents = timelineItem.attributedComponents {
|
||||
FormattedBodyText(attributedComponents: attributedComponents)
|
||||
} else {
|
||||
Text(timelineItem.text)
|
||||
}
|
||||
}
|
||||
.id(timelineItem.id)
|
||||
}
|
||||
}
|
||||
|
||||
struct TextRoomTimelineView_Previews: PreviewProvider {
|
||||
static var previews: some View {
|
||||
VStack(spacing: 20.0) {
|
||||
let timelineItem = TextRoomTimelineItem(id: UUID().uuidString,
|
||||
text: "Short loin ground round tongue hamburger, fatback salami shoulder. Beef turkey sausage kielbasa strip steak. Alcatra capicola pig tail pancetta chislic.",
|
||||
timestamp: "Now",
|
||||
shouldShowSenderDetails: true,
|
||||
senderId: "Bob")
|
||||
TextRoomTimelineView(timelineItem: timelineItem)
|
||||
|
||||
let timelineItem = TextRoomTimelineItem(id: UUID().uuidString,
|
||||
text: "Some other text",
|
||||
timestamp: "Later",
|
||||
shouldShowSenderDetails: true,
|
||||
senderId: "Anne")
|
||||
TextRoomTimelineView(timelineItem: timelineItem)
|
||||
}
|
||||
.padding()
|
||||
}
|
||||
}
|
||||
@@ -0,0 +1,235 @@
|
||||
//
|
||||
// TimelineView.swift
|
||||
// ElementX
|
||||
//
|
||||
// Created by Stefan Ceriu on 30/03/2022.
|
||||
// Copyright © 2022 Element. All rights reserved.
|
||||
//
|
||||
|
||||
import Foundation
|
||||
import SwiftUI
|
||||
import Combine
|
||||
|
||||
import Introspect
|
||||
|
||||
struct TimelineView: View {
|
||||
|
||||
@State private var tableViewObserver: TableViewObserver = TableViewObserver()
|
||||
@State private var timelineItems: [RoomTimelineViewProvider] = []
|
||||
@State private var hasPendingChanges = false
|
||||
@State private var text: String = ""
|
||||
|
||||
@ObservedObject var context: RoomScreenViewModel.Context
|
||||
|
||||
var body: some View {
|
||||
// The observer behaves differently when not in an reader
|
||||
ScrollViewReader { _ in
|
||||
List {
|
||||
HStack {
|
||||
Spacer()
|
||||
ProgressView()
|
||||
.opacity(context.viewState.isBackPaginating ? 1.0 : 0.0)
|
||||
.animation(.default, value: context.viewState.isBackPaginating)
|
||||
Spacer()
|
||||
}
|
||||
|
||||
// No idea why previews don't work otherwise
|
||||
ForEach(isPreview ? context.viewState.items : timelineItems) { timelineItem in
|
||||
timelineItem
|
||||
.listRowSeparator(.hidden)
|
||||
.onAppear {
|
||||
context.send(viewAction: .itemAppeared(id: timelineItem.id))
|
||||
}
|
||||
.onDisappear {
|
||||
context.send(viewAction: .itemDisappeared(id: timelineItem.id))
|
||||
}
|
||||
.environment(\.openURL, OpenURLAction { url in
|
||||
context.send(viewAction: .linkClicked(url: url))
|
||||
return .systemAction
|
||||
})
|
||||
}
|
||||
}
|
||||
.listStyle(.plain)
|
||||
.environment(\.defaultMinListRowHeight, 0.0)
|
||||
.introspectTableView { tableView in
|
||||
if tableView == tableViewObserver.tableView {
|
||||
return
|
||||
}
|
||||
|
||||
tableViewObserver = TableViewObserver(tableView: tableView,
|
||||
topDetectionOffset: (tableView.bounds.size.height / 3.0))
|
||||
|
||||
// Check if there are enough items. Otherwise ask for more
|
||||
attemptBackPagination()
|
||||
}
|
||||
.onReceive(tableViewObserver.scrollViewDidReachTop, perform: {
|
||||
if context.viewState.isBackPaginating {
|
||||
return
|
||||
}
|
||||
|
||||
attemptBackPagination()
|
||||
})
|
||||
.onChange(of: context.viewState.items) { _ in
|
||||
// Don't update the list while moving
|
||||
if tableViewObserver.isDecelerating || tableViewObserver.isTracking {
|
||||
hasPendingChanges = true
|
||||
return
|
||||
}
|
||||
|
||||
tableViewObserver.saveCurrentOffset()
|
||||
timelineItems = context.viewState.items
|
||||
}
|
||||
.onReceive(tableViewObserver.scrollViewDidRest, perform: {
|
||||
if hasPendingChanges == false {
|
||||
return
|
||||
}
|
||||
|
||||
tableViewObserver.saveCurrentOffset()
|
||||
timelineItems = context.viewState.items
|
||||
hasPendingChanges = false
|
||||
})
|
||||
.onChange(of: timelineItems, perform: { _ in
|
||||
tableViewObserver.restoreSavedOffset()
|
||||
|
||||
// Check if there are enough items. Otherwise ask for more
|
||||
attemptBackPagination()
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
private func attemptBackPagination() {
|
||||
if context.viewState.isBackPaginating {
|
||||
return
|
||||
}
|
||||
|
||||
if tableViewObserver.isTopVisible == false {
|
||||
return
|
||||
}
|
||||
context.send(viewAction: .loadPreviousPage)
|
||||
}
|
||||
|
||||
private var isPreview: Bool {
|
||||
#if DEBUG
|
||||
return ProcessInfo.processInfo.environment["XCODE_RUNNING_FOR_PREVIEWS"] == "1"
|
||||
#else
|
||||
return false
|
||||
#endif
|
||||
}
|
||||
}
|
||||
|
||||
private class TableViewObserver: NSObject, UITableViewDelegate {
|
||||
|
||||
private enum ContentOffsetDetails {
|
||||
case topOffset(previousVisibleIndexPath: IndexPath, previousItemCount: Int)
|
||||
case bottomOffset
|
||||
}
|
||||
|
||||
private let topDetectionOffset: CGFloat
|
||||
private var isAtTop: Bool = false
|
||||
private var offsetDetails: ContentOffsetDetails?
|
||||
|
||||
private(set) var tableView: UITableView?
|
||||
|
||||
let scrollViewDidRest = PassthroughSubject<Void, Never>()
|
||||
let scrollViewDidReachTop = PassthroughSubject<Void, Never>()
|
||||
|
||||
override init() {
|
||||
self.topDetectionOffset = 0.0
|
||||
}
|
||||
|
||||
init(tableView: UITableView, topDetectionOffset: CGFloat) {
|
||||
self.tableView = tableView
|
||||
self.topDetectionOffset = topDetectionOffset
|
||||
super.init()
|
||||
|
||||
tableView.delegate = self
|
||||
}
|
||||
|
||||
func saveCurrentOffset() {
|
||||
guard let tableView = tableView,
|
||||
tableView.numberOfSections > 0 else {
|
||||
return
|
||||
}
|
||||
|
||||
if isBottomVisible {
|
||||
offsetDetails = .bottomOffset
|
||||
} else if isTopVisible {
|
||||
if let topIndexPath = tableView.indexPathsForVisibleRows?.first {
|
||||
offsetDetails = .topOffset(previousVisibleIndexPath: topIndexPath,
|
||||
previousItemCount: tableView.numberOfRows(inSection: 0))
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
func restoreSavedOffset() {
|
||||
defer {
|
||||
offsetDetails = nil
|
||||
}
|
||||
|
||||
guard let tableView = tableView,
|
||||
tableView.numberOfSections > 0 else {
|
||||
return
|
||||
}
|
||||
|
||||
let currentItemCount = tableView.numberOfRows(inSection: 0)
|
||||
|
||||
switch offsetDetails {
|
||||
case .bottomOffset:
|
||||
tableView.scrollToRow(at: .init(row: max(0, currentItemCount - 1), section: 0), at: .bottom, animated: false)
|
||||
case .topOffset(let indexPath, let previousItemCount):
|
||||
let row = indexPath.row + max(0, (currentItemCount - previousItemCount))
|
||||
if row < currentItemCount {
|
||||
tableView.scrollToRow(at: .init(row: row, section: 0), at: .top, animated: false)
|
||||
}
|
||||
case .none:
|
||||
break
|
||||
}
|
||||
}
|
||||
|
||||
var isTracking: Bool {
|
||||
self.tableView?.isTracking == true
|
||||
}
|
||||
|
||||
var isDecelerating: Bool {
|
||||
self.tableView?.isDecelerating == true
|
||||
}
|
||||
|
||||
var isTopVisible: Bool {
|
||||
guard let scrollView = tableView else {
|
||||
return false
|
||||
}
|
||||
|
||||
return (scrollView.contentOffset.y + scrollView.adjustedContentInset.top) <= topDetectionOffset
|
||||
}
|
||||
|
||||
// MARK: - UIScrollViewDelegate
|
||||
|
||||
func scrollViewDidScroll(_ scrollView: UIScrollView) {
|
||||
let isTopVisible = isTopVisible
|
||||
if isTopVisible && isAtTop != isTopVisible {
|
||||
scrollViewDidReachTop.send(())
|
||||
}
|
||||
|
||||
isAtTop = isTopVisible
|
||||
}
|
||||
|
||||
func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
|
||||
scrollViewDidRest.send(())
|
||||
}
|
||||
|
||||
func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerating: Bool) {
|
||||
if decelerating == false {
|
||||
scrollViewDidRest.send(())
|
||||
}
|
||||
}
|
||||
|
||||
// MARK: - Private
|
||||
|
||||
private var isBottomVisible: Bool {
|
||||
guard let scrollView = tableView else {
|
||||
return false
|
||||
}
|
||||
|
||||
return (scrollView.contentOffset.y) >= (scrollView.contentSize.height - scrollView.frame.size.height)
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user