100 lines
3.8 KiB
Swift
100 lines
3.8 KiB
Swift
//
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// Copyright (c) 2018 Touch Instinct
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the Software), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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//
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import RxSwift
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import RxCocoa
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/// Class that used for binding text field with upper level view model.
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open class TextFieldViewModel < ViewEvents: TextFieldViewEvents,
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ViewModelEvents: TextFieldViewModelEvents> {
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/// Events that can be emitted by view model.
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public let viewModelEvents: ViewModelEvents
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private let viewEventsRelay = BehaviorRelay<ViewEvents?>(value: nil)
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private(set) public var disposeBag = DisposeBag()
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/// Initializer with view model events.
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///
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/// - Parameter viewModelEvents: Events that can be emitted by view model.
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public init(viewModelEvents: ViewModelEvents) {
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self.viewModelEvents = viewModelEvents
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}
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/// View events driver that will emit view events structure
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/// when view will bind itself to the view model.
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public var viewEventsDriver: Driver<ViewEvents> {
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return viewEventsRelay
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.asDriver()
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.flatMap { viewEvents -> Driver<ViewEvents> in
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guard let viewEvents = viewEvents else {
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return .empty()
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}
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return .just(viewEvents)
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}
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}
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/// Method that performs binding view events to view model.
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///
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/// - Parameter viewEvents: View events structure.
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public func bind(viewEvents: ViewEvents) {
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viewEventsRelay.accept(viewEvents)
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}
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/// Unbinds view from view model.
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public func unbindView() {
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disposeBag = DisposeBag()
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}
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}
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public extension TextFieldViewModel {
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typealias MapViewEventClosure = (ViewEvents) -> Disposable
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/// Convenient method for binding to the current view events structure.
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///
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/// - Parameter closure: Closure that takes a view events parameter and returns Disposable.
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/// - Returns: Disposable object that can be used to unsubscribe the observer from the binding.
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func mapViewEvents(_ closure: @escaping MapViewEventClosure) -> Disposable {
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return mapViewEvents { [closure($0)] }
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}
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typealias MapViewEventsClosure = (ViewEvents) -> [Disposable]
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/// Convenient method for binding to the current view events structure.
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///
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/// - Parameter closure: Closure that takes a view events parameter and returns [Disposable].
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/// - Returns: Disposable object that can be used to unsubscribe the observer from the binding.
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func mapViewEvents(_ closure: @escaping MapViewEventsClosure) -> Disposable {
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return viewEventsDriver
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.map { [weak self] in
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guard let strongSelf = self else {
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return
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}
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closure($0).forEach { $0.disposed(by: strongSelf.disposeBag) }
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}
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.drive()
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}
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}
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