//
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// SnapKit
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//
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// Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#if canImport(UIKit)
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import UIKit
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#else
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import AppKit
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#endif
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public protocol LayoutConstraintItem: AnyObject {
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}
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@available(iOS 9.0, OSX 10.11, *)
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extension ConstraintLayoutGuide : LayoutConstraintItem {
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}
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extension ConstraintView : LayoutConstraintItem {
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}
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extension LayoutConstraintItem {
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internal func prepare() {
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if let view = self as? ConstraintView {
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view.translatesAutoresizingMaskIntoConstraints = false
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}
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}
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internal var superview: ConstraintView? {
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if let view = self as? ConstraintView {
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return view.superview
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}
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if #available(iOS 9.0, OSX 10.11, *), let guide = self as? ConstraintLayoutGuide {
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return guide.owningView
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}
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return nil
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}
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internal var constraints: [Constraint] {
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return self.constraintsSet.allObjects as! [Constraint]
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}
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internal func add(constraints: [Constraint]) {
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let constraintsSet = self.constraintsSet
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for constraint in constraints {
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constraintsSet.add(constraint)
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}
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}
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internal func remove(constraints: [Constraint]) {
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let constraintsSet = self.constraintsSet
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for constraint in constraints {
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constraintsSet.remove(constraint)
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}
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}
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private var constraintsSet: NSMutableSet {
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let constraintsSet: NSMutableSet
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if let existing = objc_getAssociatedObject(self, &constraintsKey) as? NSMutableSet {
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constraintsSet = existing
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} else {
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constraintsSet = NSMutableSet()
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objc_setAssociatedObject(self, &constraintsKey, constraintsSet, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
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}
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return constraintsSet
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}
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}
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private var constraintsKey: UInt8 = 0
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