LONDON-IOS/Pods/RxGesture/Pod/Classes/GestureRecognizer+RxGesture.swift

// Copyright (c) RxSwiftCommunity

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// of this software and associated documentation files (the "Software"), to deal
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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import RxSwift
import RxCocoa
import struct CoreGraphics.CGPoint

public typealias LocationInView = (RxGestureView) -> CGPoint

extension ObservableType where Element: RxGestureRecognizer {

    /**
     Filters the observable `GestureRecognizer` events sequence based on the `GestureRecognizer` state.

     - parameter state: An `GestureRecognizerState` that is used to filter the `GestureRecognizer` events sequence.
     - returns: An observable `GestureRecognizer` events sequence that only contains events emitted while the `GestureRecognizer`'s state match the given `state`.
     */
    public func when(_ states: RxGestureRecognizerState...) -> Observable<Element> {
        filter { gesture in
            states.contains(gesture.state)
        }
    }

    /**
     Filters the observable `GestureRecognizer` events sequence based on the `GestureRecognizer` state.

     - parameter state: An `GestureRecognizerState` that is used to filter the `GestureRecognizer` events sequence.
     - returns: An observable `GestureRecognizer` events sequence that only contains events emitted while the `GestureRecognizer`'s state match the given `state`.
     */
    internal func when(_ states: [RxGestureRecognizerState]) -> Observable<Element> {
        filter { gesture in
            states.contains(gesture.state)
        }
    }

    /**
     Maps the observable `GestureRecognizer` events sequence to an observable sequence of points computed as the location in the given `view` of the gesture.

     - parameter view: A `TargetView` value on which the gesture took place.
     */
    public func asLocation(in view: TargetView = .view) -> Observable<RxGesturePoint> {
        map { gesture in
            gesture.location(in: view.targetView(for: gesture))
        }
    }

    public func asLocationInView() -> Observable<LocationInView> {
        map { gesture in
            let targetView = gesture.view!
            let location = gesture.location(in: targetView)
            return { view in
                targetView.convert(location, to: view)
            }
        }
    }

}