//
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// NSControl+Rx.swift
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// RxCocoa
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//
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// Created by Krunoslav Zaher on 5/31/15.
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// Copyright © 2015 Krunoslav Zaher. All rights reserved.
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//
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#if os(macOS)
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import Cocoa
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import RxSwift
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private var rx_value_key: UInt8 = 0
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private var rx_control_events_key: UInt8 = 0
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extension Reactive where Base: NSControl {
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/// Reactive wrapper for control event.
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public var controlEvent: ControlEvent<()> {
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MainScheduler.ensureRunningOnMainThread()
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let source = self.lazyInstanceObservable(&rx_control_events_key) { () -> Observable<Void> in
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Observable.create { [weak control = self.base] observer in
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MainScheduler.ensureRunningOnMainThread()
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guard let control = control else {
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observer.on(.completed)
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return Disposables.create()
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}
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let observer = ControlTarget(control: control) { _ in
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observer.on(.next(()))
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}
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return observer
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}
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.take(until: self.deallocated)
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.share()
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}
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return ControlEvent(events: source)
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}
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/// Creates a `ControlProperty` that is triggered by target/action pattern value updates.
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///
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/// - parameter getter: Property value getter.
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/// - parameter setter: Property value setter.
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public func controlProperty<T>(
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getter: @escaping (Base) -> T,
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setter: @escaping (Base, T) -> Void
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) -> ControlProperty<T> {
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MainScheduler.ensureRunningOnMainThread()
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let source = self.base.rx.lazyInstanceObservable(&rx_value_key) { () -> Observable<()> in
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return Observable.create { [weak weakControl = self.base] (observer: AnyObserver<()>) in
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guard let control = weakControl else {
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observer.on(.completed)
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return Disposables.create()
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}
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observer.on(.next(()))
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let observer = ControlTarget(control: control) { _ in
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if weakControl != nil {
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observer.on(.next(()))
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}
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}
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return observer
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}
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.take(until: self.deallocated)
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.share(replay: 1, scope: .whileConnected)
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}
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.flatMap { [weak base] _ -> Observable<T> in
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guard let control = base else { return Observable.empty() }
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return Observable.just(getter(control))
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}
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let bindingObserver = Binder(self.base, binding: setter)
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return ControlProperty(values: source, valueSink: bindingObserver)
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}
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}
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#endif
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