Fabric: Wiring layout pipeline between Surface and ShadowTree

Summary:
The layout pipeline is quite long:
UIKit <-> Surface <-> SurfacePresenter <-> [RCTScheduler <|-|> Scheduler] <-> ShadowTree <-> RootShadowNode <-> YogaNode.

Reviewed By: mdvacca

Differential Revision: D7857048

fbshipit-source-id: 06c92ef1639465d17e2489667f99d0114b80dcff

React/Fabric/RCTScheduler.h

@@ -9,6 +9,8 @@
 #import <memory>
 
 #import <React/RCTPrimitives.h>
+#import <fabric/core/LayoutConstraints.h>
+#import <fabric/core/LayoutContext.h>
 #import <fabric/uimanager/FabricUIManager.h>
 #import <fabric/uimanager/TreeMutationInstruction.h>
 
@@ -38,6 +40,14 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)unregisterRootTag:(ReactTag)tag;
 
+- (CGSize)measureWithLayoutConstraints:(facebook::react::LayoutConstraints)layoutConstraints
+                         layoutContext:(facebook::react::LayoutContext)layoutContext
+                               rootTag:(ReactTag)rootTag;
+
+- (void)constraintLayoutWithLayoutConstraints:(facebook::react::LayoutConstraints)layoutConstraints
+                                layoutContext:(facebook::react::LayoutContext)layoutContext
+                                      rootTag:(ReactTag)rootTag;
+
 @end
 
 @interface RCTScheduler (Deprecated)

React/Fabric/RCTScheduler.mm

@@ -10,6 +10,8 @@
 #import <fabric/uimanager/Scheduler.h>
 #import <fabric/uimanager/SchedulerDelegate.h>
 
+#import "RCTConversions.h"
+
 using namespace facebook::react;
 
 class SchedulerDelegateProxy: public SchedulerDelegate {
@@ -61,6 +63,20 @@ private:
   _scheduler->unregisterRootTag(tag);
 }
 
+- (CGSize)measureWithLayoutConstraints:(LayoutConstraints)layoutConstraints
+                         layoutContext:(LayoutContext)layoutContext
+                               rootTag:(ReactTag)rootTag
+{
+  return RCTCGSizeFromSize(_scheduler->measure(rootTag, layoutConstraints, layoutContext));
+}
+
+- (void)constraintLayoutWithLayoutConstraints:(LayoutConstraints)layoutConstraints
+                                layoutContext:(LayoutContext)layoutContext
+                                      rootTag:(ReactTag)rootTag
+{
+  _scheduler->constraintLayout(rootTag, layoutConstraints, layoutContext);
+}
+
 @end
 
 @implementation RCTScheduler (Deprecated)

React/Fabric/RCTSurfacePresenter.h

@@ -29,7 +29,7 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
-@interface RCTSurfacePresenter (Internal)
+@interface RCTSurfacePresenter (Surface)
 
 /**
  * Surface uses those methods to register itself in the Presenter.
@@ -38,6 +38,19 @@ NS_ASSUME_NONNULL_BEGIN
 - (void)registerSurface:(RCTFabricSurface *)surface;
 - (void)unregisterSurface:(RCTFabricSurface *)surface;
 
+/**
+ * Measures the Surface with given constraints.
+ */
+- (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize
+                      maximumSize:(CGSize)maximumSize
+                          surface:(RCTFabricSurface *)surface;
+
+/**
+ * Sets `minimumSize` and `maximumSize` layout constraints for the Surface.
+ */
+- (void)setMinimumSize:(CGSize)minimumSize
+           maximumSize:(CGSize)maximumSize
+               surface:(RCTFabricSurface *)surface;
 @end
 
 @interface RCTSurfacePresenter (Deprecated)

React/Fabric/RCTSurfacePresenter.mm

@@ -19,6 +19,11 @@
 #import <React/RCTSurfaceView.h>
 #import <React/RCTSurfaceView+Internal.h>
 
+#import <fabric/core/LayoutContext.h>
+#import <fabric/core/LayoutConstraints.h>
+
+#import "RCTConversions.h"
+
 using namespace facebook::react;
 
 @interface RCTSurfacePresenter () <RCTSchedulerDelegate, RCTMountingManagerDelegate>
@@ -87,6 +92,34 @@ using namespace facebook::react;
   [_surfaceRegistry unregisterSurface:surface];
 }
 
+- (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize
+                      maximumSize:(CGSize)maximumSize
+                          surface:(RCTFabricSurface *)surface
+{
+  LayoutContext layoutContext;
+  LayoutConstraints layoutConstraints = {};
+  layoutConstraints.minimumSize = RCTSizeFromCGSize(minimumSize);
+  layoutConstraints.maximumSize = RCTSizeFromCGSize(maximumSize);
+
+  return [_scheduler measureWithLayoutConstraints:layoutConstraints
+                                    layoutContext:layoutContext
+                                          rootTag:surface.rootTag];
+}
+
+- (void)setMinimumSize:(CGSize)minimumSize
+           maximumSize:(CGSize)maximumSize
+               surface:(RCTFabricSurface *)surface
+{
+  LayoutContext layoutContext;
+  LayoutConstraints layoutConstraints = {};
+  layoutConstraints.minimumSize = RCTSizeFromCGSize(minimumSize);
+  layoutConstraints.maximumSize = RCTSizeFromCGSize(maximumSize);
+
+  [_scheduler constraintLayoutWithLayoutConstraints:layoutConstraints
+                                      layoutContext:layoutContext
+                                            rootTag:surface.rootTag];
+}
+
 - (void)runSurface:(RCTFabricSurface *)surface
 {
   NSDictionary *applicationParameters = @{
@@ -122,9 +155,6 @@ using namespace facebook::react;
 
   UIView *rootComponentView = [_mountingManager.componentViewRegistry componentViewByTag:rootTag];
 
-  // FIXME: Remove this.
-  rootComponentView.frame = CGRectMake(0, 0, 400, 400);
-
   surface.view.rootView = (RCTSurfaceRootView *)rootComponentView;
 }
 

React/Fabric/Surface/RCTFabricSurface.mm

@@ -188,8 +188,9 @@
 - (CGSize)sizeThatFitsMinimumSize:(CGSize)minimumSize
                       maximumSize:(CGSize)maximumSize
 {
-  // TODO: Not supported yet.
-  return CGSizeZero;
+  return [_surfacePresenter sizeThatFitsMinimumSize:minimumSize
+                                        maximumSize:maximumSize
+                                            surface:self];
 }
 
 #pragma mark - Size Constraints
@@ -213,7 +214,9 @@
     _minimumSize = minimumSize;
   }
 
-  // TODO: Not supported yet.
+  return [_surfacePresenter setMinimumSize:minimumSize
+                               maximumSize:maximumSize
+                                   surface:self];
 }
 
 - (CGSize)minimumSize