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Pods/SwiftEntryKit/Source/Extensions/QuickLayout/QLUtils.swift

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+//
+//  QLUtils.swift
+//  QuickLayout
+//
+//  Created by Daniel Huri on 11/21/17.
+//
+
+import Foundation
+import UIKit
+
+/**
+ Typealias for dictionary that contains multiple constraints
+ */
+public typealias QLMultipleConstraints = [QLAttribute: NSLayoutConstraint]
+
+/**
+ Extends layout priority to other readable types
+ */
+public extension QLPriority {
+    static let must = QLPriority(rawValue: 999)
+    static let zero = QLPriority(rawValue: 0)
+}
+
+/**
+ Represents pair of attributes
+ */
+public struct QLAttributePair {
+    public let first: QLAttribute
+    public let second: QLAttribute
+}
+
+/**
+ Represents size constraints
+ */
+public struct QLSizeConstraints {
+    public let width: NSLayoutConstraint
+    public let height: NSLayoutConstraint
+}
+
+/**
+ Represents center constraints
+ */
+public struct QLCenterConstraints {
+    public let x: NSLayoutConstraint
+    public let y: NSLayoutConstraint
+}
+
+/**
+ Represents axis constraints (might be .top and .bottom, .left and .right, .leading and .trailing)
+ */
+public struct QLAxisConstraints {
+    public let first: NSLayoutConstraint
+    public let second: NSLayoutConstraint
+}
+
+/**
+ Represents center and size constraints
+ */
+public struct QLFillConstraints {
+    public let center: QLCenterConstraints
+    public let size: QLSizeConstraints
+}
+
+/**
+ Represents pair of priorities
+ */
+public struct QLPriorityPair {
+    
+    public let horizontal: QLPriority
+    public let vertical: QLPriority
+    public static var required: QLPriorityPair {
+        return QLPriorityPair(.required, .required)
+    }
+    
+    public static var must: QLPriorityPair {
+        return QLPriorityPair(.must, .must)
+    }
+    
+    public init(_ horizontal: QLPriority, _ vertical: QLPriority) {
+        self.horizontal = horizontal
+        self.vertical = vertical
+    }
+}
+
+/**
+ Represents axis description
+ */
+public enum QLAxis {
+    case horizontally
+    case vertically
+    
+    public var attributes: QLAttributePair {
+        
+        let first: QLAttribute
+        let second: QLAttribute
+        
+        switch self {
+        case .horizontally:
+            first = .left
+            second = .right
+        case .vertically:
+            first = .top
+            second = .bottom
+        }
+        return QLAttributePair(first: first, second: second)
+    }
+}