80 lines
2.4 KiB
Swift
80 lines
2.4 KiB
Swift
// Copyright © 2022 Rangeproof Pty Ltd. All rights reserved.
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import UIKit
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import Combine
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// MARK: -
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public extension UIView {
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final class Subscription<SubscriberType: Subscriber, Input: UIView>: Combine.Subscription where SubscriberType.Input == Input {
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private var subscriber: SubscriberType?
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private var tapGestureRecognizer: UITapGestureRecognizer?
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private let input: Input
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// MARK: - Initialization
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public init(subscriber: SubscriberType, input: Input) {
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self.subscriber = subscriber
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self.input = input
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let tapGestureRecognizer: UITapGestureRecognizer = UITapGestureRecognizer(target: self, action: #selector(eventHandler))
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self.tapGestureRecognizer = tapGestureRecognizer
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input.addGestureRecognizer(tapGestureRecognizer)
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}
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// MARK: - Subscriber
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// Do nothing as we only want to send events when they occur
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public func request(_ demand: Subscribers.Demand) {}
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// MARK: - Cancellable
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public func cancel() {
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if let tapGestureRecognizer: UITapGestureRecognizer = self.tapGestureRecognizer {
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input.removeGestureRecognizer(tapGestureRecognizer)
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}
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subscriber = nil
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tapGestureRecognizer = nil
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}
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// MARK: - Internal Functions
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@objc private func eventHandler() {
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_ = subscriber?.receive(input)
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}
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}
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// MARK: -
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struct Publisher<Output: UIView>: Combine.Publisher {
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public typealias Output = Output
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public typealias Failure = Never
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let output: Output
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// MARK: - Initialization
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public init(output: Output) {
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self.output = output
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}
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// MARK: - Publisher
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public func receive<S>(subscriber: S) where S : Subscriber, Never == S.Failure, Output == S.Input {
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let subscription: Subscription = Subscription(subscriber: subscriber, input: output)
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subscriber.receive(subscription: subscription)
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}
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}
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}
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// MARK: - CombineCompatible
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extension UIView: CombineCompatible {}
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extension CombineCompatible where Self: UIView {
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public var tapPublisher: UIView.Publisher<Self> {
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return UIView.Publisher(output: self)
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}
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}
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