Expose CKComponent to Swift.

Summary:
Swift name is now `Component`. Note that IRL it's `ComponentKit.Component` - so that leaves some space for `CKSwift.Component`.

Alternatively we can keep the `CKCompoent` but I couldn't think of a reason to do so.

I've currently excluded `viewContext` and `+newWithView:size:` since we've got no symbols for these yet.

Reviewed By: kfirapps

Differential Revision: D19744076

fbshipit-source-id: 03468eed000cb19468dc98e4d73165cd342757d9

Author: cuva

ComponentKit/Analytics/CKSystraceListener.h

@@ -17,6 +17,7 @@
 #import <Foundation/Foundation.h>
 #import <ComponentKit/CKComponent.h>
 #import <ComponentKit/CKMountable.h>
+#import <ComponentKit/CKLayout.h>
 
 @protocol CKMountable;
 @protocol CKRenderComponentProtocol;

ComponentKit/Core/CKComponent.h

@@ -8,17 +8,13 @@
  *
  */
 
+#import <UIKit/UIKit.h>
 #import <ComponentKit/CKDefines.h>
 
-#if CK_NOT_SWIFT
-
 #if !defined(__cplusplus) && CK_NOT_SWIFT
 #error This file must be compiled Obj-C++ or imported from Swift. Objective-C files should have their extension changed to .mm.
 #endif
 
-#import <UIKit/UIKit.h>
-
-#import <ComponentKit/CKComponentLayout.h>
 #import <ComponentKit/CKComponentProtocol.h>
 #import <ComponentKit/CKComponentSize.h>
 #import <ComponentKit/CKComponentViewConfiguration.h>
@@ -27,8 +23,16 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /** A component is an immutable object that specifies how to configure a view, loosely inspired by React. */
+NS_SWIFT_NAME(Component)
 @interface CKComponent : NSObject <CKMountable, CKComponentProtocol>
 
+- (instancetype)init CK_SWIFT_DESIGNATED_INITIALIZER;
+
+#if CK_NOT_SWIFT
+
+- (instancetype)initWithView:(const CKComponentViewConfiguration &)view
+                        size:(const CKComponentSize &)size;
+
 /**
  @param view A struct describing the view for this component. Pass {} to specify that no view should be created.
  @param size A size constraint that should apply to this component. Pass {} to specify no size constraint.
@@ -39,16 +43,9 @@ NS_ASSUME_NONNULL_BEGIN
 + (instancetype)newWithView:(const CKComponentViewConfiguration &)view
                        size:(const CKComponentSize &)size;
 
-/**
- While the component is mounted, returns information about the component's manifestation in the view hierarchy.
-
- If this component creates a view, this method returns the view it created (or recycled) and a frame with origin 0,0
- and size equal to the view's bounds, since the component's size is the view's size.
++ (instancetype)new;
 
- If this component does not create a view, returns the view this component is mounted within and the logical frame
- of the component's content. In this case, you should **not** make any assumptions about what class the view is.
- */
-- (CKComponentViewContext)viewContext;
+#endif
 
 /**
  While the component is mounted, returns its next responder. This is the first of:
@@ -61,11 +58,10 @@ NS_ASSUME_NONNULL_BEGIN
 @end
 
 #define CK_COMPONENT_INIT_UNAVAILABLE \
++ (instancetype)new NS_UNAVAILABLE; \
 + (instancetype)newWithView:(const CKComponentViewConfiguration &)view \
                        size:(const CKComponentSize &)size NS_UNAVAILABLE
 
 NS_ASSUME_NONNULL_END
 
 #import <ComponentKit/ComponentBuilder.h>
-
-#endif

ComponentKit/Core/CKComponent.mm

@@ -94,7 +94,7 @@ + (instancetype)new
 
 - (instancetype)init
 {
-  CK_NOT_DESIGNATED_INITIALIZER();
+  return [self initWithView:{} size:{}];
 }
 
 - (instancetype)initWithView:(const CKComponentViewConfiguration &)view
@@ -148,6 +148,11 @@ - (void)setViewConfiguration:(const CKComponentViewConfiguration &)viewConfigura
   _viewConfiguration = viewConfiguration;
 }
 
+- (CKComponentScopeHandle *)scopeHandle
+{
+  return _scopeHandle;
+}
+
 - (CKComponentViewContext)viewContext
 {
   CKAssertMainThread();

ComponentKit/Core/CKComponentInternal.h

@@ -82,17 +82,14 @@
 /** Used to get the scope root enumerator; during component creation only */
 @property (nonatomic, strong, readonly) id<CKComponentScopeEnumeratorProvider> scopeEnumeratorProvider;
 
-/** For internal use only; don't touch this. */
-@property (nonatomic, strong, readonly) CKComponentScopeHandle *scopeHandle;
-
 /** For internal debug use only; don't touch this. */
-- (NSString *)backtraceStackDescription;
+@property (nonatomic, copy, readonly) NSString *backtraceStackDescription;
 
 /**
  Update component in controller right after new generation is created.
  NOTE: This should only be used by ComponentKit infra.
  */
-+ (BOOL)shouldUpdateComponentInController;
+@property (nonatomic, assign, readonly, class) BOOL shouldUpdateComponentInController;
 
 @end
 

ComponentKit/Core/CKComponentSubclass.h

@@ -8,12 +8,9 @@
  *
  */
 
-#import <ComponentKit/CKDefines.h>
-
-#if CK_NOT_SWIFT
-
 #import <Foundation/Foundation.h>
 
+#import <ComponentKit/CKDefines.h>
 #import <ComponentKit/CKComponent.h>
 #import <ComponentKit/CKComponentAnimation.h>
 #import <ComponentKit/CKComponentBoundsAnimation.h>
@@ -33,6 +30,8 @@ extern CGSize const kCKComponentParentSizeUndefined;
 
 @interface CKComponent ()
 
+#if CK_NOT_SWIFT
+
 /**
  Call this on children components to compute their layouts within your implementation of -computeLayoutThatFits:.
 
@@ -78,11 +77,7 @@ extern CGSize const kCKComponentParentSizeUndefined;
                           restrictedToSize:(const CKComponentSize &)size
                       relativeToParentSize:(CGSize)parentSize;
 
-/**
- Called to get the component's initial state; the default implementation returns nil.
- @see CKComponentScopeFrame
- */
-+ (id _Nullable)initialState;
+#endif
 
 /**
  Returns the component's state if available.
@@ -122,6 +117,8 @@ extern CGSize const kCKComponentParentSizeUndefined;
  */
 - (BOOL)canPerformAction:(SEL _Nullable)action withSender:(id _Nullable)sender;
 
+#if CK_NOT_SWIFT
+
 /**
  Override to return a list of animations that will be applied to the component when it is first mounted.
 
@@ -159,6 +156,8 @@ extern CGSize const kCKComponentParentSizeUndefined;
  */
 - (std::vector<CKComponentFinalUnmountAnimation>)animationsOnFinalUnmount;
 
+#endif
+
 /**
  Attempts to return a view suitable for rendering an animation.
 
@@ -172,13 +171,11 @@ extern CGSize const kCKComponentParentSizeUndefined;
 
  This method may be overridden in rare situations where a more suitable view should be used for rendering animations.
  */
-- (UIView * _Nullable)viewForAnimation;
+@property (nonatomic, strong, readonly, nullable) UIView *viewForAnimation;
 
 /** Returns the component's controller, if any. */
-- (CKComponentController * _Nullable)controller;
+- (CKComponentController *_Nullable)controller;
 
 @end
 
 NS_ASSUME_NONNULL_END
-
-#endif

RenderCore/Base/CKDefines.h

@@ -20,6 +20,8 @@
 
 #if CK_SWIFT
   #define CK_SWIFT_DESIGNATED_INITIALIZER NS_DESIGNATED_INITIALIZER
+  #define CK_OBJC_UNAVAILABLE
 #else
   #define CK_SWIFT_DESIGNATED_INITIALIZER CK_NOT_DESIGNATED_INITIALIZER_ATTRIBUTE
+  #define CK_OBJC_UNAVAILABLE NS_UNAVAILABLE
 #endif

RenderCore/CKMountable.h

@@ -128,3 +128,5 @@ NS_SWIFT_NAME(Mountable)
 #endif
 
 NS_ASSUME_NONNULL_END
+
+#import <RenderCore/CKLayout.h>