ConstraintPriority.swift 2.4 KB

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  1. //
  2. // SnapKit
  3. //
  4. // Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
  5. //
  6. // Permission is hereby granted, free of charge, to any person obtaining a copy
  7. // of this software and associated documentation files (the "Software"), to deal
  8. // in the Software without restriction, including without limitation the rights
  9. // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10. // copies of the Software, and to permit persons to whom the Software is
  11. // furnished to do so, subject to the following conditions:
  12. //
  13. // The above copyright notice and this permission notice shall be included in
  14. // all copies or substantial portions of the Software.
  15. //
  16. // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17. // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18. // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19. // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20. // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21. // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22. // THE SOFTWARE.
  23. #if os(iOS) || os(tvOS)
  24. import UIKit
  25. #else
  26. import AppKit
  27. #endif
  28. public struct ConstraintPriority : ExpressibleByFloatLiteral, Equatable, Strideable {
  29. public typealias FloatLiteralType = Float
  30. public let value: Float
  31. public init(floatLiteral value: Float) {
  32. self.value = value
  33. }
  34. public init(_ value: Float) {
  35. self.value = value
  36. }
  37. public static var required: ConstraintPriority {
  38. return 1000.0
  39. }
  40. public static var high: ConstraintPriority {
  41. return 750.0
  42. }
  43. public static var medium: ConstraintPriority {
  44. #if os(OSX)
  45. return 501.0
  46. #else
  47. return 500.0
  48. #endif
  49. }
  50. public static var low: ConstraintPriority {
  51. return 250.0
  52. }
  53. public static func ==(lhs: ConstraintPriority, rhs: ConstraintPriority) -> Bool {
  54. return lhs.value == rhs.value
  55. }
  56. // MARK: Strideable
  57. public func advanced(by n: FloatLiteralType) -> ConstraintPriority {
  58. return ConstraintPriority(floatLiteral: value + n)
  59. }
  60. public func distance(to other: ConstraintPriority) -> FloatLiteralType {
  61. return other.value - value
  62. }
  63. }