Revert "Add layer-action support to nodes (#1396)"

This reverts commit 34f1621.

Author: nguyenhuy

Source/ASDisplayNode+Subclasses.h

@@ -376,13 +376,6 @@ AS_CATEGORY_IMPLEMENTABLE
  */
 @property (readonly) CGFloat contentsScaleForDisplay;
 
-/**
- * Called as part of actionForLayer:forKey:. Gives the node a chance to provide a custom action for its layer.
- *
- * The default implementation returns NSNull, indicating that no action should be taken.
- */
-AS_CATEGORY_IMPLEMENTABLE
-- (nullable id<CAAction>)layerActionForKey:(NSString *)event;
 
 #pragma mark - Touch handling
 /** @name Touch handling */

Source/ASDisplayNode.h

@@ -694,8 +694,6 @@ AS_EXTERN NSInteger const ASDefaultDrawingPriority;
 @property (getter=isExclusiveTouch) BOOL exclusiveTouch;      // default=NO
 #endif
 
-@property (nullable, copy) NSDictionary<NSString *, id<CAAction>> *actions; // default = nil
-
 /**
  * @abstract The node view's background color.
  *

Source/ASDisplayNode.mm

@@ -64,7 +64,11 @@
 
 static ASDisplayNodeNonFatalErrorBlock _nonFatalErrorBlock = nil;
 
-@interface ASDisplayNode () <UIGestureRecognizerDelegate, _ASDisplayLayerDelegate, ASCATransactionQueueObserving>
+// Forward declare CALayerDelegate protocol as the iOS 10 SDK moves CALayerDelegate from an informal delegate to a protocol.
+// We have to forward declare the protocol as this place otherwise it will not compile compiling with an Base SDK < iOS 10
+@protocol CALayerDelegate;
+
+@interface ASDisplayNode () <UIGestureRecognizerDelegate, CALayerDelegate, _ASDisplayLayerDelegate, ASCATransactionQueueObserving>
 /**
  * See ASDisplayNodeInternal.h for ivars
  */
@@ -103,10 +107,9 @@ BOOL ASDisplayNodeNeedsSpecialPropertiesHandling(BOOL isSynchronous, BOOL isLaye
   return result;
 }
 
-void StubImplementationWithNoArgs(id receiver, SEL _cmd) {}
-void StubImplementationWithSizeRange(id receiver, SEL _cmd, ASSizeRange sr) {}
-void StubImplementationWithTwoInterfaceStates(id receiver, SEL _cmd, ASInterfaceState s0, ASInterfaceState s1) {}
-id StubLayerActionImplementation(id receiver, SEL _cmd, NSString *key) { return (id)kCFNull; }
+void StubImplementationWithNoArgs(id receiver) {}
+void StubImplementationWithSizeRange(id receiver, ASSizeRange sr) {}
+void StubImplementationWithTwoInterfaceStates(id receiver, ASInterfaceState s0, ASInterfaceState s1) {}
 
 /**
  *  Returns ASDisplayNodeFlags for the given class/instance. instance MAY BE NIL.
@@ -278,8 +281,6 @@ + (void)initialize
     auto interfaceStateType = std::string(@encode(ASInterfaceState));
     auto type1 = "v@:" + interfaceStateType + interfaceStateType;
     class_addMethod(self, @selector(interfaceStateDidChange:fromState:), (IMP)StubImplementationWithTwoInterfaceStates, type1.c_str());
-
-    class_addMethod(self, @selector(layerActionForKey:), (IMP)StubLayerActionImplementation, "@@:@");
   }
 }
 
@@ -1817,6 +1818,7 @@ - (void)subnodeDisplayDidFinish:(ASDisplayNode *)subnode
 
 #pragma mark <CALayerDelegate>
 
+// We are only the delegate for the layer when we are layer-backed, as UIView performs this function normally
 - (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event
 {
   if (event == kCAOnOrderIn) {
@@ -1825,7 +1827,8 @@ - (void)subnodeDisplayDidFinish:(ASDisplayNode *)subnode
     [self __exitHierarchy];
   }
 
-  return [self layerActionForKey:event];
+  ASDisplayNodeAssert(_flags.layerBacked, @"We shouldn't get called back here unless we are layer-backed.");
+  return (id)kCFNull;
 }
 
 #pragma mark - Error Handling

Source/Details/UIView+ASConvenience.h

@@ -43,7 +43,6 @@ NS_ASSUME_NONNULL_BEGIN
 @property (nonatomic) BOOL allowsGroupOpacity;
 @property (nonatomic) BOOL allowsEdgeAntialiasing;
 @property (nonatomic) unsigned int edgeAntialiasingMask;
-@property (nonatomic, nullable, copy) NSDictionary<NSString *, id<CAAction>> *actions;
 
 - (void)setNeedsDisplay;
 - (void)setNeedsLayout;

Source/Details/_ASDisplayLayer.mm

@@ -115,13 +115,6 @@ - (void)setNeedsDisplay
 
 #pragma mark -
 
-+ (id<CAAction>)defaultActionForKey:(NSString *)event
-{
-  // We never want to run one of CA's root default actions. So if we return nil from actionForLayer:forKey:, and let CA
-  // dig into the actions dictionary, and it doesn't find it there, it will check here and we need to stop the search.
-  return (id)kCFNull;
-}
-
 + (dispatch_queue_t)displayQueue
 {
   static dispatch_queue_t displayQueue = NULL;

Source/Details/_ASDisplayView.mm

@@ -153,19 +153,22 @@ - (NSString *)description
 
 #pragma mark - UIView Overrides
 
-- (id<CAAction>)actionForLayer:(CALayer *)layer forKey:(NSString *)event
+- (void)willMoveToWindow:(UIWindow *)newWindow
 {
-  id<CAAction> uikitAction = [super actionForLayer:layer forKey:event];
-
-  // Even though the UIKit action will take precedence, we still unconditionally forward to the node so that it can
-  // track events like kCAOnOrderIn.
-  id<CAAction> nodeAction = [_asyncdisplaykit_node actionForLayer:layer forKey:event];
+  ASDisplayNode *node = _asyncdisplaykit_node; // Create strong reference to weak ivar.
+  BOOL visible = (newWindow != nil);
+  if (visible && !node.inHierarchy) {
+    [node __enterHierarchy];
+  }
+}
 
-  // If UIKit specifies an action, that takes precedence. That's an animation block so it's explicit.
-  if (uikitAction && uikitAction != (id)kCFNull) {
-    return uikitAction;
+- (void)didMoveToWindow
+{
+  ASDisplayNode *node = _asyncdisplaykit_node; // Create strong reference to weak ivar.
+  BOOL visible = (self.window != nil);
+  if (!visible && node.inHierarchy) {
+    [node __exitHierarchy];
   }
-  return nodeAction;
 }
 
 - (void)willMoveToSuperview:(UIView *)newSuperview

Source/Private/ASDisplayNode+UIViewBridge.mm

@@ -959,18 +959,6 @@ - (void)setInsetsLayoutMarginsFromSafeArea:(BOOL)insetsLayoutMarginsFromSafeArea
   }
 }
 
-- (NSDictionary<NSString *,id<CAAction>> *)actions
-{
-  _bridge_prologue_read;
-  return _getFromLayer(actions);
-}
-
-- (void)setActions:(NSDictionary<NSString *,id<CAAction>> *)actions
-{
-  _bridge_prologue_write;
-  _setToLayer(actions, actions);
-}
-
 - (void)safeAreaInsetsDidChange
 {
   ASDisplayNodeAssertMainThread();

Source/Private/ASDisplayNodeInternal.h

@@ -78,7 +78,7 @@ static constexpr CACornerMask kASCACornerAllCorners =
 
 #define NUM_CLIP_CORNER_LAYERS 4
 
-@interface ASDisplayNode () <_ASTransitionContextCompletionDelegate, CALayerDelegate>
+@interface ASDisplayNode () <_ASTransitionContextCompletionDelegate>
 {
 @package
   AS::RecursiveMutex __instanceLock__;

Source/Private/_ASPendingState.mm

@@ -86,11 +86,9 @@
   int setLayoutMargins:1;
   int setPreservesSuperviewLayoutMargins:1;
   int setInsetsLayoutMarginsFromSafeArea:1;
-  int setActions:1;
   int setMaskedCorners : 1;
 } ASPendingStateFlags;
 
-
 static constexpr ASPendingStateFlags kZeroFlags = {0};
 
 @implementation _ASPendingState
@@ -145,7 +143,6 @@ @implementation _ASPendingState
   CGPoint accessibilityActivationPoint;
   UIBezierPath *accessibilityPath;
   UISemanticContentAttribute semanticContentAttribute API_AVAILABLE(ios(9.0), tvos(9.0));
-  NSDictionary<NSString *, id<CAAction>> *actions;
 
   ASPendingStateFlags _flags;
 }
@@ -215,7 +212,6 @@ ASDISPLAYNODE_INLINE void ASPendingStateApplyMetricsToLayer(_ASPendingState *sta
 @synthesize layoutMargins=layoutMargins;
 @synthesize preservesSuperviewLayoutMargins=preservesSuperviewLayoutMargins;
 @synthesize insetsLayoutMarginsFromSafeArea=insetsLayoutMarginsFromSafeArea;
-@synthesize actions=actions;
 @synthesize maskedCorners = maskedCorners;
 
 static CGColorRef blackColorRef = NULL;
@@ -600,12 +596,6 @@ - (void)setSemanticContentAttribute:(UISemanticContentAttribute)attribute API_AV
   _flags.setSemanticContentAttribute = YES;
 }
 
-- (void)setActions:(NSDictionary<NSString *,id<CAAction>> *)actionsArg
-{
-  actions = [actionsArg copy];
-  _flags.setActions = YES;
-}
-
 - (BOOL)isAccessibilityElement
 {
   return isAccessibilityElement;
@@ -943,9 +933,6 @@ - (void)applyToLayer:(CALayer *)layer
   if (flags.setOpaque)
     ASDisplayNodeAssert(layer.opaque == opaque, @"Didn't set opaque as desired");
 
-  if (flags.setActions)
-    layer.actions = actions;
-
   ASPendingStateApplyMetricsToLayer(self, layer);
 
   if (flags.needsLayout)
@@ -965,7 +952,7 @@ - (void)applyToView:(UIView *)view withSpecialPropertiesHandling:(BOOL)specialPr
    because a different setter would be called.
    */
 
-  unowned CALayer *layer = view.layer;
+  CALayer *layer = view.layer;
 
   ASPendingStateFlags flags = _flags;
   if (__shouldSetNeedsDisplay(layer)) {
@@ -1008,9 +995,6 @@ - (void)applyToView:(UIView *)view withSpecialPropertiesHandling:(BOOL)specialPr
   if (flags.setRasterizationScale)
     layer.rasterizationScale = rasterizationScale;
 
-  if (flags.setActions)
-    layer.actions = actions;
-
   if (flags.setClipsToBounds)
     view.clipsToBounds = clipsToBounds;
 
@@ -1304,7 +1288,7 @@ + (_ASPendingState *)pendingViewStateFromView:(UIView *)view
 
 - (void)clearChanges
 {
-  _flags = kZeroFlags;
+  _flags = (ASPendingStateFlags){ 0 };
 }
 
 - (BOOL)hasSetNeedsLayout

Tests/ASDisplayNodeTests.mm

@@ -9,7 +9,6 @@
 
 #import <QuartzCore/QuartzCore.h>
 #import <XCTest/XCTest.h>
-#import <OCMock/OCMock.h>
 
 #import <AsyncDisplayKit/_ASDisplayLayer.h>
 #import <AsyncDisplayKit/_ASDisplayView.h>
@@ -2698,17 +2697,4 @@ - (void)testCornerRoundingTypeClippingRoundedCornersIsUsingASDisplayNodeCornerLa
   }
 }
 
-- (void)testLayerActionForKeyIsCalled
-{
-  UIWindow *window = [[UIWindow alloc] init];
-  ASDisplayNode *node = [[ASDisplayNode alloc] init];
-
-  id mockNode = OCMPartialMock(node);
-  OCMExpect([mockNode layerActionForKey:kCAOnOrderIn]);
-  [window.layer addSublayer:node.layer];
-  OCMExpect([mockNode layerActionForKey:@"position"]);
-  node.layer.position = CGPointMake(10, 10);
-  OCMVerifyAll(mockNode);
-}
-
 @end