Some commit

examples/ASViewController/Sample/DetailRootNode.m

@@ -28,6 +28,8 @@ static const NSInteger kImageHeight = 200;
 @property (nonatomic, copy) NSString *imageCategory;
 @property (nonatomic, strong) ASCollectionNode *collectionNode;
 
+@property (nonatomic, strong) ASDisplayNode *backgroundNode;
+
 @end
 
 

examples/ASViewController/Sample/DetailViewController.m

@@ -19,9 +19,36 @@
 #import <AsyncDisplayKit/AsyncDisplayKit.h>
 
 #import "DetailRootNode.h"
+#import "SampleSizingNode.h"
+
+@interface DetailViewController ()
+@property (strong, nonatomic) SampleSizingNode *sizingNode;
+
+@end
 
 @implementation DetailViewController
 
+#pragma mark - Lifecycle
+
+- (instancetype)initWithNode:(DetailRootNode *)node
+{
+    self = [super initWithNode:node];
+    
+    // Set the sizing delegate of the root node to the container
+    self.sizingNode = [SampleSizingNode new];
+    self.sizingNode.autoresizingMask = UIViewAutoresizingNone;
+    self.sizingNode.delegate = self;
+    
+    return self;
+}
+
+- (void)viewDidLoad
+{
+    [super viewDidLoad];
+    
+    [self.view addSubnode:self.sizingNode];
+}
+
 #pragma mark - Rotation
 
 - (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
@@ -30,4 +57,32 @@
     [self.node.collectionNode.view.collectionViewLayout invalidateLayout];
 }
 
+- (void)viewDidLayoutSubviews
+{
+    [super viewDidLayoutSubviews];
+    
+    [self updateNodeLayout];
+}
+
+#pragma mark - Update the node based on the new size
+
+- (void)displayNodeDidInvalidateSize:(ASDisplayNode *)displayNode
+{
+    // ASDisplayNodeSizingDelegate / ASDisplayNodeSizingHandlers
+    [self updateNodeLayout];
+}
+
+- (void)updateNodeLayout
+{
+    // Adjust the layout on the new layout
+    
+    // Use the bounds of the view and get the fitting size
+    CGSize size = [self.sizingNode sizeThatFits:CGSizeMake(CGFLOAT_MAX, 100.0)];
+    size.width -= 10;
+    //[self.sizingNode setNeedsLayout];
+    self.sizingNode.frame = CGRectMake((self.view.bounds.size.width - size.width) / 2.0,
+                                       (self.view.bounds.size.height - size.height) / 2.0,
+                                       size.width, size.height);
+}
+
 @end

examples/ASViewController/Sample/SampleSizingNode.h

@@ -0,0 +1,17 @@
+//
+//  SampleSizingNode.h
+//  Sample
+//
+//  Created by Michael Schneider on 11/10/16.
+//  Copyright © 2016 AsyncDisplayKit. All rights reserved.
+//
+
+#import <AsyncDisplayKit/AsyncDisplayKit.h>
+
+@interface ASDisplayNodeSizingDelegate : NSObject
+- (void)displayNodeDidInvalidateSize:(ASDisplayNode *)displayNode;
+@end
+
+@interface SampleSizingNode : ASDisplayNode
+@property (nonatomic, weak) id delegate;
+@end

examples/ASViewController/Sample/SampleSizingNode.m

@@ -0,0 +1,86 @@
+//
+//  SampleSizingNode.m
+//  Sample
+//
+//  Created by Michael Schneider on 11/10/16.
+//  Copyright © 2016 AsyncDisplayKit. All rights reserved.
+//
+
+#import "SampleSizingNode.h"
+
+@interface SampleSizingNode ()
+@property (nonatomic, strong) ASDisplayNode *subnode;
+@property (nonatomic, assign) NSInteger state;
+
+@property (nonatomic, strong) ASTextNode *textNode;
+@end
+
+@implementation SampleSizingNode
+
+- (instancetype)init
+{
+    self = [super init];
+    if (self) {
+        
+        self.automaticallyManagesSubnodes = YES;
+        
+        //_subnode = [ASDisplayNode new];
+        //_subnode.backgroundColor = [UIColor redColor];
+        
+        _textNode = [ASTextNode new];
+        _textNode.backgroundColor = [UIColor blueColor];
+        _textNode.autoresizingMask = UIViewAutoresizingNone;
+        
+        _state = 0;
+    }
+    return self;
+}
+
+- (void)didLoad
+{
+    [super didLoad];
+    
+    [self stateChanged];
+    
+    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        self.state = 1;
+    });
+}
+
+#pragma mark - State Management
+
+- (void)setState:(NSInteger)state
+{
+    _state = state;
+    [self stateChanged];
+}
+
+- (void)stateChanged
+{
+    NSString *text = self.state == 0 ? @"Bla Bla" : @"Bla Blaa sd fkj as;l dkf";
+    self.textNode.attributedText = [[NSAttributedString alloc] initWithString:text];
+    
+    // Invalidate the layout for now and bubble it up until the root node to let the size provider know that
+    // that a size change happened
+    [self setNeedsLayout];
+    
+    // If someone calls `setNeedsLayout` we have to inform the sizing delegate of the root node to be able
+    // to let them now that a size change happened
+    if ([self.delegate respondsToSelector:@selector(displayNodeDidInvalidateSize:)]) {
+        [self.delegate performSelector:@selector(displayNodeDidInvalidateSize:) withObject:self];
+    }
+}
+
+
+#pragma mark - ASDisplayNode
+
+- (ASLayoutSpec *)layoutSpecThatFits:(ASSizeRange)constrainedSize
+{
+    // Layout description based on state
+    //self.subnode.style.preferredSize = constrainedSize.max;
+    UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 10);
+    return [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:_textNode];
+}
+
+
+@end