deltachat-ios/Pods/InputBarAccessoryView/Sources/Models/NSConstraintLayoutSet.swift

//
//  NSConstraintLayoutSet.swift
//  InputBarAccessoryView
//
//  Copyright © 2017-2019 Nathan Tannar.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.
//
//  Created by Nathan Tannar on 8/25/17.
//

import Foundation
import UIKit

class NSLayoutConstraintSet {
    
    var top: NSLayoutConstraint?
    var bottom: NSLayoutConstraint?
    var left: NSLayoutConstraint?
    var right: NSLayoutConstraint?
    var centerX: NSLayoutConstraint?
    var centerY: NSLayoutConstraint?
    var width: NSLayoutConstraint?
    var height: NSLayoutConstraint?
    
    public init(top: NSLayoutConstraint? = nil,
                bottom: NSLayoutConstraint? = nil,
                left: NSLayoutConstraint? = nil,
                right: NSLayoutConstraint? = nil,
                centerX: NSLayoutConstraint? = nil,
                centerY: NSLayoutConstraint? = nil,
                width: NSLayoutConstraint? = nil,
                height: NSLayoutConstraint? = nil) {
        self.top = top
        self.bottom = bottom
        self.left = left
        self.right = right
        self.centerX = centerX
        self.centerY = centerY
        self.width = width
        self.height = height
    }
    
    /// All of the currently configured constraints
    private var availableConstraints: [NSLayoutConstraint] {
        #if swift(>=4.1)
            return [top, bottom, left, right, centerX, centerY, width, height].compactMap {$0}
        #else
            return [top, bottom, left, right, centerX, centerY, width, height].flatMap {$0}
        #endif
    }
    
    /// Activates all of the non-nil constraints
    ///
    /// - Returns: Self
    @discardableResult
    func activate() -> Self {
        NSLayoutConstraint.activate(availableConstraints)
        return self
    }
    
    /// Deactivates all of the non-nil constraints
    ///
    /// - Returns: Self
    @discardableResult
    func deactivate() -> Self {
        NSLayoutConstraint.deactivate(availableConstraints)
        return self
    }
}