//
//  GestureRecognizerProxy.swift
//  PaiaiUIKit
//
//  Created by ffib on 2019/1/28.
//  Copyright © 2019 yb. All rights reserved.
//

import Foundation

class GestureRecognizerProxy: NSObject, UIGestureRecognizerDelegate {
    weak var delegate: GestureRecognizerDelegate?
    
    init(target: GestureRecognizerDelegate) {
        delegate = target
    }
    
    func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        guard let d = delegate else { return false }
        return d.gestureRecognizerShouldBegin(gestureRecognizer)
    }
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldReceive touch: UITouch) -> Bool {
        guard let d = delegate else { return false }
        return d.gestureRecognizer(gestureRecognizer, shouldReceive: touch)
    }
    
    func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer,
                           shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
        guard let d = delegate else { return false }
        return d.gestureRecognizer(gestureRecognizer, shouldRecognizeSimultaneouslyWith: otherGestureRecognizer)
    }
}

extension UIGestureRecognizer {
    private struct AssociatedKeys {
        static var proxyKey = "GestureRecognizerProxyKey"
    }
    
    private var proxy: GestureRecognizerProxy? {
        get { return objc_getAssociatedObject(self, &AssociatedKeys.proxyKey) as? GestureRecognizerProxy }
        set { objc_setAssociatedObject(self, &AssociatedKeys.proxyKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC) }
    }
    
    func setDelegate(_ target: GestureRecognizerDelegate) {
        proxy = GestureRecognizerProxy(target: target)
        delegate = proxy
    }
}