ConstraintDescription.swift 2.5 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 class ConstraintDescription {
  29. internal let item: LayoutConstraintItem
  30. internal var attributes: ConstraintAttributes
  31. internal var relation: ConstraintRelation? = nil
  32. internal var sourceLocation: (String, UInt)? = nil
  33. internal var label: String? = nil
  34. internal var related: ConstraintItem? = nil
  35. internal var multiplier: ConstraintMultiplierTarget = 1.0
  36. internal var constant: ConstraintConstantTarget = 0.0
  37. internal var priority: ConstraintPriorityTarget = 1000.0
  38. internal lazy var constraint: Constraint? = {
  39. guard let relation = self.relation,
  40. let related = self.related,
  41. let sourceLocation = self.sourceLocation else {
  42. return nil
  43. }
  44. let from = ConstraintItem(target: self.item, attributes: self.attributes)
  45. return Constraint(
  46. from: from,
  47. to: related,
  48. relation: relation,
  49. sourceLocation: sourceLocation,
  50. label: self.label,
  51. multiplier: self.multiplier,
  52. constant: self.constant,
  53. priority: self.priority
  54. )
  55. }()
  56. // MARK: Initialization
  57. internal init(item: LayoutConstraintItem, attributes: ConstraintAttributes) {
  58. self.item = item
  59. self.attributes = attributes
  60. }
  61. }