Temp

submodules/Display/Source/NavigationBarTransitionContainer.swift

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+import Foundation
+import UIKit
+import AsyncDisplayKit
+
+class NavigationBarTransitionContainer: ASDisplayNode {
+    var progress: CGFloat = 0.0 {
+        didSet {
+            self.layout()
+        }
+    }
+    
+    let transition: NavigationTransition
+    let topNavigationBar: NavigationBar
+    let bottomNavigationBar: NavigationBar
+    
+    let topClippingNode: ASDisplayNode
+    let bottomClippingNode: ASDisplayNode
+    
+    let topNavigationBarSupernode: ASDisplayNode?
+    let bottomNavigationBarSupernode: ASDisplayNode?
+    
+    init(transition: NavigationTransition, topNavigationBar: NavigationBar, bottomNavigationBar: NavigationBar) {
+        self.transition = transition
+        
+        self.topNavigationBar = topNavigationBar
+        self.topNavigationBarSupernode = topNavigationBar.supernode
+        
+        self.bottomNavigationBar = bottomNavigationBar
+        self.bottomNavigationBarSupernode = bottomNavigationBar.supernode
+        
+        self.topClippingNode = ASDisplayNode()
+        self.topClippingNode.clipsToBounds = true
+        self.bottomClippingNode = ASDisplayNode()
+        self.bottomClippingNode.clipsToBounds = true
+        
+        super.init()
+        
+        self.topClippingNode.addSubnode(self.topNavigationBar)
+        self.bottomClippingNode.addSubnode(self.bottomNavigationBar)
+        
+        self.addSubnode(self.bottomClippingNode)
+        self.addSubnode(self.topClippingNode)
+    }
+    
+    func complete() {
+        self.topNavigationBarSupernode?.addSubnode(self.topNavigationBar)
+        self.bottomNavigationBarSupernode?.addSubnode(self.bottomNavigationBar)
+    }
+    
+    override func layout() {
+        super.layout()
+        
+        let size = self.bounds.size
+        
+        let position: CGFloat
+        switch self.transition {
+            case .Push:
+                position = 1.0 - progress
+            case .Pop:
+                position = progress
+        }
+        
+        let offset = floorToScreenPixels(size.width * position)
+
+        self.topClippingNode.frame = CGRect(origin: CGPoint(x: offset, y: 0.0), size: size)
+        
+        self.bottomClippingNode.frame = CGRect(origin: CGPoint(x: 0.0, y: 0.0), size: CGSize(width: offset, height: size.height))
+    }
+}