Some more stuff in flux

AsyncDisplayKit/ASDisplayNode.mm

@@ -716,10 +716,20 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
 #pragma clang diagnostic pop
 }
 
+- (ASLayout *)cacheLayoutThatFits:(ASSizeRange)constrainedSize
+{
+  return [self cacheLayoutThatFits:constrainedSize parentSize:constrainedSize.max];
+}
+
 - (ASLayout *)layoutThatFits:(ASSizeRange)constrainedSize parentSize:(CGSize)parentSize
 {
   ASDN::MutexLocker l(__instanceLock__);
+  
+  return [self calculateLayoutThatFits:constrainedSize restrictedToSize:self.style.size relativeToParentSize:parentSize];
+}
 
+- (ASLayout *)cacheLayoutThatFits:(ASSizeRange)constrainedSize parentSize:(CGSize)parentSize
+{
   if ([self shouldCalculateLayoutWithConstrainedSize:constrainedSize parentSize:parentSize] == NO) {
     ASDisplayNodeAssertNotNil(_calculatedDisplayNodeLayout->layout, @"-[ASDisplayNode layoutThatFits:parentSize:] _layout should not be nil! %@", self);
     return _calculatedDisplayNodeLayout->layout ? : [ASLayout layoutWithLayoutElement:self size:{0, 0}];
@@ -1504,7 +1514,7 @@ static ASDisplayNodeMethodOverrides GetASDisplayNodeMethodOverrides(Class c)
     LOG(@"Warning: No size given for node before node was trying to layout itself: %@. Please provide a frame for the node.", self);
   } else {
     if (CGSizeEqualToSize(calculatedLayoutSize, bounds.size) == NO) {
-      [self layoutThatFits:ASSizeRangeMake(bounds.size)];
+      [self cacheLayoutThatFits:ASSizeRangeMake(bounds.size)];
     }
   }
 }

examples/ASViewController/Sample/DetailViewController.m

@@ -49,12 +49,17 @@
     [self.view addSubnode:self.sizingNode];
 }
 
-#pragma mark - Rotation
-
-- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
+- (void)viewWillAppear:(BOOL)animated
 {
-    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
-    [self.node.collectionNode.view.collectionViewLayout invalidateLayout];
+    [super viewWillAppear:animated];
+    
+    // Initial size of sizing node
+    self.sizingNode.frame = CGRectMake(100, 100, 50, 50);
+    
+    // Start some timer  to chang ethe size randomly
+    [NSTimer scheduledTimerWithTimeInterval:2.0 repeats:YES block:^(NSTimer * _Nonnull timer) {
+        //[self updateNodeLayoutRandom];
+    }];
 }
 
 - (void)viewDidLayoutSubviews
@@ -66,23 +71,61 @@
 
 #pragma mark - Update the node based on the new size
 
+// The sizing delegate will get callbacks if the size did invalidate of the display node. It's the job of the delegate
+// to get the new size from the display node and update the frame based on the returned size
 - (void)displayNodeDidInvalidateSize:(ASDisplayNode *)displayNode
 {
-    // ASDisplayNodeSizingDelegate / ASDisplayNodeSizingHandlers
     [self updateNodeLayout];
+    
+    /*dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        [self updateNodeLayoutRandom];
+    });*/
+    
+   /*[NSTimer scheduledTimerWithTimeInterval:2.0 repeats:YES block:^(NSTimer * _Nonnull timer) {
+        [self updateNodeLayoutRandom];
+    }];*/
 }
 
 - (void)updateNodeLayout
 {
     // Adjust the layout on the new layout
-    
+    //return;
     // Use the bounds of the view and get the fitting size
+    // This does not have any side effects, but can be called on the main thread without any problems
     CGSize size = [self.sizingNode sizeThatFits:CGSizeMake(CGFLOAT_MAX, 100.0)];
-    size.width -= 10;
+    //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);
+    
+    //dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(1 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
+        self.sizingNode.frame = CGRectInset(self.sizingNode.frame, 10, 10);
+    //});
 }
 
+- (void)updateNodeLayoutRandom
+{
+    // Pick a randome width and height and set the frame of the node
+    CGSize size = CGSizeZero;
+    size.width = arc4random_uniform(self.view.bounds.size.width);
+    size.height = arc4random_uniform(self.view.bounds.size.height);
+    
+    //[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);
+
+}
+
+
+#pragma mark - Rotation
+
+- (void)viewWillTransitionToSize:(CGSize)size withTransitionCoordinator:(id<UIViewControllerTransitionCoordinator>)coordinator
+{
+    [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
+    [self.node.collectionNode.view.collectionViewLayout invalidateLayout];
+}
+
+
 @end

examples/ASViewController/Sample/SampleSizingNode.h

@@ -8,6 +8,7 @@
 
 #import <AsyncDisplayKit/AsyncDisplayKit.h>
 
+// ASDisplayNodeSizingDelegate / ASDisplayNodeSizingHandlers
 @interface ASDisplayNodeSizingDelegate : NSObject
 - (void)displayNodeDidInvalidateSize:(ASDisplayNode *)displayNode;
 @end

examples/ASViewController/Sample/SampleSizingNode.m

@@ -24,12 +24,19 @@
         
         self.automaticallyManagesSubnodes = YES;
         
-        //_subnode = [ASDisplayNode new];
-        //_subnode.backgroundColor = [UIColor redColor];
+        self.backgroundColor = [UIColor greenColor];
         
         _textNode = [ASTextNode new];
         _textNode.backgroundColor = [UIColor blueColor];
-        _textNode.autoresizingMask = UIViewAutoresizingNone;
+        //_textNode.autoresizingMask = UIViewAutoresizingNone;
+        
+        _subnode = [ASDisplayNode new];
+        _subnode.backgroundColor = [UIColor redColor];
+        _subnode.automaticallyManagesSubnodes = YES;
+        _subnode.layoutSpecBlock = ^ASLayoutSpec *(__kindof ASDisplayNode * _Nonnull node, ASSizeRange constrainedSize) {
+            UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 10);
+            return [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:_textNode];
+        };
         
         _state = 0;
     }
@@ -61,7 +68,8 @@
     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
+    // that a size change could have happened
+    // --> Do we even need to invalidate the layout?
     [self setNeedsLayout];
     
     // If someone calls `setNeedsLayout` we have to inform the sizing delegate of the root node to be able
@@ -77,9 +85,14 @@
 - (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];
+   // UIEdgeInsets insets = UIEdgeInsetsMake(10, 10, 10, 10);
+   // return [ASInsetLayoutSpec insetLayoutSpecWithInsets:insets child:_textNode];
+    
+    //return [ASWrapperLayoutSpec wrapperWithLayoutElement:self.subnode];
+    return [ASCenterLayoutSpec
+            centerLayoutSpecWithCenteringOptions:ASCenterLayoutSpecCenteringXY
+            sizingOptions:ASCenterLayoutSpecSizingOptionDefault
+            child:self.subnode];
 }