Shuffle & Cleanup Stuff (#3080)

Source/ASNavigationController.m

@@ -0,0 +1,100 @@
+//
+//  ASNavigationController.m
+//  AsyncDisplayKit
+//
+//  Created by Garrett Moon on 4/27/16.
+//
+//  Copyright (c) 2014-present, Facebook, Inc.  All rights reserved.
+//  This source code is licensed under the BSD-style license found in the
+//  LICENSE file in the root directory of this source tree. An additional grant
+//  of patent rights can be found in the PATENTS file in the same directory.
+//
+
+#import <AsyncDisplayKit/ASNavigationController.h>
+
+@implementation ASNavigationController
+{
+  BOOL _parentManagesVisibilityDepth;
+  NSInteger _visibilityDepth;
+}
+
+ASVisibilityDidMoveToParentViewController;
+
+ASVisibilityViewWillAppear;
+
+ASVisibilityViewDidDisappearImplementation;
+
+ASVisibilitySetVisibilityDepth;
+
+ASVisibilityDepthImplementation;
+
+- (void)visibilityDepthDidChange
+{
+  for (UIViewController *viewController in self.viewControllers) {
+    if ([viewController conformsToProtocol:@protocol(ASVisibilityDepth)]) {
+      [(id <ASVisibilityDepth>)viewController visibilityDepthDidChange];
+    }
+  }
+}
+
+- (NSInteger)visibilityDepthOfChildViewController:(UIViewController *)childViewController
+{
+  NSUInteger viewControllerIndex = [self.viewControllers indexOfObjectIdenticalTo:childViewController];
+  if (viewControllerIndex == NSNotFound) {
+    //If childViewController is not actually a child, return NSNotFound which is also a really large number.
+    return NSNotFound;
+  }
+  
+  if (viewControllerIndex == self.viewControllers.count - 1) {
+    //view controller is at the top, just return our own visibility depth.
+    return [self visibilityDepth];
+  } else if (viewControllerIndex == 0) {
+    //view controller is the root view controller. Can be accessed by holding the back button.
+    return [self visibilityDepth] + 1;
+  }
+  
+  return [self visibilityDepth] + self.viewControllers.count - 1 - viewControllerIndex;
+}
+
+#pragma mark - UIKit overrides
+
+- (NSArray *)popToViewController:(UIViewController *)viewController animated:(BOOL)animated
+{
+  NSArray *viewControllers = [super popToViewController:viewController animated:animated];
+  [self visibilityDepthDidChange];
+  return viewControllers;
+}
+
+- (NSArray *)popToRootViewControllerAnimated:(BOOL)animated
+{
+  NSArray *viewControllers = [super popToRootViewControllerAnimated:animated];
+  [self visibilityDepthDidChange];
+  return viewControllers;
+}
+
+- (void)setViewControllers:(NSArray *)viewControllers
+{
+  [super setViewControllers:viewControllers];
+  [self visibilityDepthDidChange];
+}
+
+- (void)setViewControllers:(NSArray *)viewControllers animated:(BOOL)animated
+{
+  [super setViewControllers:viewControllers animated:animated];
+  [self visibilityDepthDidChange];
+}
+
+- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
+{
+  [super pushViewController:viewController animated:animated];
+  [self visibilityDepthDidChange];
+}
+
+- (UIViewController *)popViewControllerAnimated:(BOOL)animated
+{
+  UIViewController *viewController = [super popViewControllerAnimated:animated];
+  [self visibilityDepthDidChange];
+  return viewController;
+}
+
+@end