[Fiber] Add top level render callbacks into ReactDOMFiber and ReactNoop

src/renderers/dom/fiber/ReactDOMFiber.js

@@ -124,13 +124,13 @@ function warnAboutUnstableUse() {
 
 var ReactDOM = {
 
-  render(element : ReactElement<any>, container : DOMContainerElement) {
+  render(element : ReactElement<any>, container : DOMContainerElement, callback: ?Function) {
     warnAboutUnstableUse();
     let root;
     if (!container._reactRootContainer) {
-      root = container._reactRootContainer = DOMRenderer.mountContainer(element, container);
+      root = container._reactRootContainer = DOMRenderer.mountContainer(element, container, callback);
     } else {
-      DOMRenderer.updateContainer(element, root = container._reactRootContainer);
+      DOMRenderer.updateContainer(element, root = container._reactRootContainer, callback);
     }
     return DOMRenderer.getPublicRootInstance(root);
   },

src/renderers/dom/fiber/__tests__/ReactDOMFiber-test.js

@@ -43,6 +43,26 @@ describe('ReactDOMFiber', () => {
     expect(container.textContent).toEqual('10');
   });
 
+  it('should be called a callback argument', () => {
+    // mounting phase
+    let called = false;
+    ReactDOM.render(
+      <div>Foo</div>,
+      container,
+      () => called = true
+    );
+    expect(called).toEqual(true);
+
+    // updating phase
+    called = false;
+    ReactDOM.render(
+      <div>Foo</div>,
+      container,
+      () => called = true
+    );
+    expect(called).toEqual(true);
+  });
+
   if (ReactDOMFeatureFlags.useFiber) {
     it('should render a component returning strings directly from render', () => {
       const Text = ({value}) => value;

src/renderers/noop/ReactNoop.js

@@ -146,11 +146,11 @@ var ReactNoop = {
 
   root: rootContainer,
 
-  render(element : ReactElement<any>) {
+  render(element : ReactElement<any>, callback: ?Function) {
     if (!root) {
-      root = NoopRenderer.mountContainer(element, rootContainer);
+      root = NoopRenderer.mountContainer(element, rootContainer, callback);
     } else {
-      NoopRenderer.updateContainer(element, root);
+      NoopRenderer.updateContainer(element, root, callback);
     }
   },
 

src/renderers/shared/fiber/ReactFiberCommitWork.js

@@ -308,6 +308,14 @@ module.exports = function<T, P, I, TI, C>(config : HostConfig<T, P, I, TI, C>) {
         attachRef(current, finishedWork, instance);
         return;
       }
+      case HostContainer: {
+        const instance = finishedWork.stateNode;
+        if (instance.callbackList) {
+          const { callbackList } = instance;
+          instance.callbackList = null;
+          callCallbacks(callbackList, instance);
+        }
+      }
       case HostComponent: {
         const instance : I = finishedWork.stateNode;
         attachRef(current, finishedWork, instance);

src/renderers/shared/fiber/ReactFiberReconciler.js

@@ -20,6 +20,8 @@ import type { PriorityLevel } from 'ReactPriorityLevel';
 var { createFiberRoot } = require('ReactFiberRoot');
 var ReactFiberScheduler = require('ReactFiberScheduler');
 
+var { createUpdateQueue, addCallbackToQueue } = require('ReactFiberUpdateQueue');
+
 if (__DEV__) {
   var ReactFiberInstrumentation = require('ReactFiberInstrumentation');
 }
@@ -74,9 +76,14 @@ module.exports = function<T, P, I, TI, C>(config : HostConfig<T, P, I, TI, C>) :
 
   return {
 
-    mountContainer(element : ReactElement<any>, containerInfo : C) : OpaqueNode {
+    mountContainer(element : ReactElement<any>, containerInfo : C, callback: ?Function) : OpaqueNode {
       const root = createFiberRoot(containerInfo);
       const container = root.current;
+      if (callback) {
+        const queue = createUpdateQueue(null);
+        addCallbackToQueue(queue, callback);
+        root.callbackList = queue;
+      }
       // TODO: Use pending work/state instead of props.
       // TODO: This should not override the pendingWorkPriority if there is
       // higher priority work in the subtree.
@@ -94,9 +101,14 @@ module.exports = function<T, P, I, TI, C>(config : HostConfig<T, P, I, TI, C>) :
       return container;
     },
 
-    updateContainer(element : ReactElement<any>, container : OpaqueNode) : void {
+    updateContainer(element : ReactElement<any>, container : OpaqueNode, callback: ?Function) : void {
       // TODO: If this is a nested container, this won't be the root.
       const root : FiberRoot = (container.stateNode : any);
+      if (callback) {
+        const queue = createUpdateQueue(null);
+        addCallbackToQueue(queue, callback);
+        root.callbackList = queue;
+      }
       // TODO: Use pending work/state instead of props.
       root.current.pendingProps = element;
 

src/renderers/shared/fiber/ReactFiberRoot.js

@@ -13,6 +13,7 @@
 'use strict';
 
 import type { Fiber } from 'ReactFiber';
+import type { UpdateQueue } from 'ReactFiberUpdateQueue';
 
 const { createHostContainerFiber } = require('ReactFiber');
 
@@ -25,6 +26,8 @@ export type FiberRoot = {
   isScheduled: boolean,
   // The work schedule is a linked list.
   nextScheduledRoot: ?FiberRoot,
+  // Linked list of callbacks to call after updates are committed.
+  callbackList: ?UpdateQueue,
 };
 
 exports.createFiberRoot = function(containerInfo : any) : FiberRoot {
@@ -36,6 +39,7 @@ exports.createFiberRoot = function(containerInfo : any) : FiberRoot {
     containerInfo: containerInfo,
     isScheduled: false,
     nextScheduledRoot: null,
+    callbackList: null,
   };
   uninitializedFiber.stateNode = root;
   return root;

src/renderers/shared/fiber/ReactFiberScheduler.js

@@ -165,6 +165,11 @@ module.exports = function<T, P, I, TI, C>(config : HostConfig<T, P, I, TI, C>) {
       const current = finishedWork.alternate;
       commitWork(current, finishedWork);
     }
+    // if the root is a HostContainer, it may have a callback.
+    if (finishedWork.tag === HostContainer) {
+      const current = finishedWork.alternate;
+      commitLifeCycles(current, finishedWork);
+    }
   }
 
   function resetWorkPriority(workInProgress : Fiber) {

src/renderers/shared/fiber/__tests__/ReactIncremental-test.js

@@ -37,6 +37,7 @@ describe('ReactIncremental', () => {
 
   it('should render a simple component, in steps if needed', () => {
 
+    var renderCallbackCalled = false;
     var barCalled = false;
     function Bar() {
       barCalled = true;
@@ -52,17 +53,20 @@ describe('ReactIncremental', () => {
       ];
     }
 
-    ReactNoop.render(<Foo />);
+    ReactNoop.render(<Foo />, () => renderCallbackCalled = true);
     expect(fooCalled).toBe(false);
     expect(barCalled).toBe(false);
+    expect(renderCallbackCalled).toBe(false);
     // Do one step of work.
     ReactNoop.flushDeferredPri(7 + 5);
     expect(fooCalled).toBe(true);
     expect(barCalled).toBe(false);
+    expect(renderCallbackCalled).toBe(false);
     // Do the rest of the work.
     ReactNoop.flushDeferredPri(50);
     expect(fooCalled).toBe(true);
     expect(barCalled).toBe(true);
+    expect(renderCallbackCalled).toBe(true);
   });
 
   it('updates a previous render', () => {
@@ -98,21 +102,21 @@ describe('ReactIncremental', () => {
       );
     }
 
-    ReactNoop.render(<Foo text="foo" />);
+    ReactNoop.render(<Foo text="foo" />, () => ops.push('renderCallbackCalled'));
     ReactNoop.flush();
 
-    expect(ops).toEqual(['Foo', 'Header', 'Content', 'Footer']);
+    expect(ops).toEqual(['Foo', 'Header', 'Content', 'Footer', 'renderCallbackCalled']);
 
     ops = [];
 
-    ReactNoop.render(<Foo text="bar" />);
+    ReactNoop.render(<Foo text="bar" />, () => ops.push('renderCallbackCalled'));
     ReactNoop.flush();
 
     // TODO: Test bail out of host components. This is currently unobservable.
 
     // Since this is an update, it should bail out and reuse the work from
     // Header and Content.
-    expect(ops).toEqual(['Foo', 'Content']);
+    expect(ops).toEqual(['Foo', 'Content', 'renderCallbackCalled']);
 
   });