6160c44d67
* Update copyright holding and dates * compound IDE Macros updated * update copyright * update copyrights done * update templates and README
80 lines
2.4 KiB
Swift
80 lines
2.4 KiB
Swift
//
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// Copyright 2025 Element Creations Ltd.
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// Copyright 2022-2025 New Vector Ltd.
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//
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// SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
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// Please see LICENSE files in the repository root for full details.
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//
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import Combine
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import UIKit
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class ScrollViewAdapter: NSObject, UIScrollViewDelegate {
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var scrollView: UIScrollView? {
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didSet {
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oldValue?.delegate = nil
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scrollView?.delegate = self
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}
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}
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var shouldScrollToTopClosure: ((UIScrollView) -> Bool)?
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private let didScrollSubject = PassthroughSubject<Void, Never>()
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var didScroll: AnyPublisher<Void, Never> {
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didScrollSubject.eraseToAnyPublisher()
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}
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private let isScrollingSubject = CurrentValueSubject<Bool, Never>(false)
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var isScrolling: CurrentValuePublisher<Bool, Never> {
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.init(isScrollingSubject)
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}
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private let isAtTopEdgeSubject: CurrentValueSubject<Bool, Never> = .init(false)
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var isAtTopEdge: CurrentValuePublisher<Bool, Never> {
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isAtTopEdgeSubject
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.asCurrentValuePublisher()
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}
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// MARK: - UIScrollViewDelegate
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func scrollViewDidScroll(_ scrollView: UIScrollView) {
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didScrollSubject.send(())
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let insetContentOffset = scrollView.contentOffset.y + scrollView.contentInset.top
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isAtTopEdgeSubject.send(insetContentOffset >= 3)
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}
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func scrollViewWillBeginDragging(_ scrollView: UIScrollView) {
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updateDidScroll(scrollView)
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}
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func scrollViewDidEndDragging(_ scrollView: UIScrollView, willDecelerate decelerate: Bool) {
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updateDidScroll(scrollView)
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}
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func scrollViewDidEndScrollingAnimation(_ scrollView: UIScrollView) {
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updateDidScroll(scrollView)
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}
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func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
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updateDidScroll(scrollView)
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}
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func scrollViewDidScrollToTop(_ scrollView: UIScrollView) {
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updateDidScroll(scrollView)
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}
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func scrollViewShouldScrollToTop(_ scrollView: UIScrollView) -> Bool {
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guard let shouldScrollToTopClosure else {
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// Default behaviour
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return true
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}
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return shouldScrollToTopClosure(scrollView)
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}
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// MARK: - Private
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private func updateDidScroll(_ scrollView: UIScrollView) {
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isScrollingSubject.send(scrollView.isDragging || scrollView.isDecelerating)
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}
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}
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