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Pods/SnapKit/Sources/LayoutConstraintItem.swift

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+//
+//  SnapKit
+//
+//  Copyright (c) 2011-Present SnapKit Team - https://github.com/SnapKit
+//
+//  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.
+
+#if os(iOS) || os(tvOS)
+    import UIKit
+#else
+    import AppKit
+#endif
+
+
+public protocol LayoutConstraintItem: AnyObject {
+}
+
+@available(iOS 9.0, OSX 10.11, *)
+extension ConstraintLayoutGuide : LayoutConstraintItem {
+}
+
+extension ConstraintView : LayoutConstraintItem {
+}
+
+
+extension LayoutConstraintItem {
+    
+    internal func prepare() {
+        if let view = self as? ConstraintView {
+            view.translatesAutoresizingMaskIntoConstraints = false
+        }
+    }
+    
+    internal var superview: ConstraintView? {
+        if let view = self as? ConstraintView {
+            return view.superview
+        }
+        
+        if #available(iOS 9.0, OSX 10.11, *), let guide = self as? ConstraintLayoutGuide {
+            return guide.owningView
+        }
+        
+        return nil
+    }
+    internal var constraints: [Constraint] {
+        return self.constraintsSet.allObjects as! [Constraint]
+    }
+    
+    internal func add(constraints: [Constraint]) {
+        let constraintsSet = self.constraintsSet
+        for constraint in constraints {
+            constraintsSet.add(constraint)
+        }
+    }
+    
+    internal func remove(constraints: [Constraint]) {
+        let constraintsSet = self.constraintsSet
+        for constraint in constraints {
+            constraintsSet.remove(constraint)
+        }
+    }
+    
+    private var constraintsSet: NSMutableSet {
+        let constraintsSet: NSMutableSet
+        
+        if let existing = objc_getAssociatedObject(self, &constraintsKey) as? NSMutableSet {
+            constraintsSet = existing
+        } else {
+            constraintsSet = NSMutableSet()
+            objc_setAssociatedObject(self, &constraintsKey, constraintsSet, .OBJC_ASSOCIATION_RETAIN_NONATOMIC)
+        }
+        return constraintsSet
+        
+    }
+    
+}
+private var constraintsKey: UInt8 = 0