ReactFabricHostConfig.js

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow
 */

import type {TouchedViewDataAtPoint, ViewConfig} from './ReactNativeTypes';
import {create, diff} from './ReactNativeAttributePayload';
import {dispatchEvent} from './ReactFabricEventEmitter';
import {
  DefaultEventPriority,
  DiscreteEventPriority,
} from 'react-reconciler/src/ReactEventPriorities';
import {HostText} from 'react-reconciler/src/ReactWorkTags';

// Modules provided by RN:
import {
  ReactNativeViewConfigRegistry,
  deepFreezeAndThrowOnMutationInDev,
  createPublicInstance,
  createPublicTextInstance,
  type PublicInstance as ReactNativePublicInstance,
  type PublicTextInstance,
} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';

const {
  createNode,
  cloneNode,
  cloneNodeWithNewChildren,
  cloneNodeWithNewChildrenAndProps,
  cloneNodeWithNewProps,
  createChildSet: createChildNodeSet,
  appendChild: appendChildNode,
  appendChildToSet: appendChildNodeToSet,
  completeRoot,
  registerEventHandler,
  unstable_DefaultEventPriority: FabricDefaultPriority,
  unstable_DiscreteEventPriority: FabricDiscretePriority,
  unstable_getCurrentEventPriority: fabricGetCurrentEventPriority,
} = nativeFabricUIManager;

const {get: getViewConfigForType} = ReactNativeViewConfigRegistry;

// Counter for uniquely identifying views.
// % 10 === 1 means it is a rootTag.
// % 2 === 0 means it is a Fabric tag.
// This means that they never overlap.
let nextReactTag = 2;

type InternalInstanceHandle = Object;
type Node = Object;
export type Type = string;
export type Props = Object;
export type Instance = {
  // Reference to the shadow node.
  node: Node,
  // This object is shared by all the clones of the instance.
  // We use it to access their shared public instance (exposed through refs)
  // and to access its committed state for events, etc.
  canonical: {
    nativeTag: number,
    viewConfig: ViewConfig,
    currentProps: Props,
    // Reference to the React handle (the fiber)
    internalInstanceHandle: InternalInstanceHandle,
    // Exposed through refs.
    publicInstance: PublicInstance,
  },
};
export type TextInstance = {
  // Reference to the shadow node.
  node: Node,
  // Text instances are never cloned, so we don't need to keep a "canonical"
  // reference to make sure all clones of the instance point to the same values.
  publicInstance?: PublicTextInstance,
};
export type HydratableInstance = Instance | TextInstance;
export type PublicInstance = ReactNativePublicInstance;
export type Container = number;
export type ChildSet = Object;
export type HostContext = $ReadOnly<{
  isInAParentText: boolean,
}>;
export type UpdatePayload = Object;

export type TimeoutHandle = TimeoutID;
export type NoTimeout = -1;

export type RendererInspectionConfig = $ReadOnly<{
  // Deprecated. Replaced with getInspectorDataForViewAtPoint.
  getInspectorDataForViewTag?: (tag: number) => Object,
  getInspectorDataForViewAtPoint?: (
    inspectedView: Object,
    locationX: number,
    locationY: number,
    callback: (viewData: TouchedViewDataAtPoint) => mixed,
  ) => void,
}>;

// TODO: Remove this conditional once all changes have propagated.
if (registerEventHandler) {
  /**
   * Register the event emitter with the native bridge
   */
  registerEventHandler(dispatchEvent);
}

export * from 'react-reconciler/src/ReactFiberHostConfigWithNoMutation';
export * from 'react-reconciler/src/ReactFiberHostConfigWithNoHydration';
export * from 'react-reconciler/src/ReactFiberHostConfigWithNoScopes';
export * from 'react-reconciler/src/ReactFiberHostConfigWithNoTestSelectors';
export * from 'react-reconciler/src/ReactFiberHostConfigWithNoMicrotasks';
export * from 'react-reconciler/src/ReactFiberHostConfigWithNoResources';
export * from 'react-reconciler/src/ReactFiberHostConfigWithNoSingletons';

export function appendInitialChild(
  parentInstance: Instance,
  child: Instance | TextInstance,
): void {
  appendChildNode(parentInstance.node, child.node);
}

export function createInstance(
  type: string,
  props: Props,
  rootContainerInstance: Container,
  hostContext: HostContext,
  internalInstanceHandle: InternalInstanceHandle,
): Instance {
  const tag = nextReactTag;
  nextReactTag += 2;

  const viewConfig = getViewConfigForType(type);

  if (__DEV__) {
    for (const key in viewConfig.validAttributes) {
      if (props.hasOwnProperty(key)) {
        deepFreezeAndThrowOnMutationInDev(props[key]);
      }
    }
  }

  const updatePayload = create(props, viewConfig.validAttributes);

  const node = createNode(
    tag, // reactTag
    viewConfig.uiViewClassName, // viewName
    rootContainerInstance, // rootTag
    updatePayload, // props
    internalInstanceHandle, // internalInstanceHandle
  );

  const component = createPublicInstance(
    tag,
    viewConfig,
    internalInstanceHandle,
  );

  return {
    node: node,
    canonical: {
      nativeTag: tag,
      viewConfig,
      currentProps: props,
      internalInstanceHandle,
      publicInstance: component,
    },
  };
}

export function createTextInstance(
  text: string,
  rootContainerInstance: Container,
  hostContext: HostContext,
  internalInstanceHandle: InternalInstanceHandle,
): TextInstance {
  if (__DEV__) {
    if (!hostContext.isInAParentText) {
      console.error('Text strings must be rendered within a <Text> component.');
    }
  }

  const tag = nextReactTag;
  nextReactTag += 2;

  const node = createNode(
    tag, // reactTag
    'RCTRawText', // viewName
    rootContainerInstance, // rootTag
    {text: text}, // props
    internalInstanceHandle, // instance handle
  );

  return {
    node: node,
  };
}

export function finalizeInitialChildren(
  parentInstance: Instance,
  type: string,
  props: Props,
  hostContext: HostContext,
): boolean {
  return false;
}

export function getRootHostContext(
  rootContainerInstance: Container,
): HostContext {
  return {isInAParentText: false};
}

export function getChildHostContext(
  parentHostContext: HostContext,
  type: string,
): HostContext {
  const prevIsInAParentText = parentHostContext.isInAParentText;
  const isInAParentText =
    type === 'AndroidTextInput' || // Android
    type === 'RCTMultilineTextInputView' || // iOS
    type === 'RCTSinglelineTextInputView' || // iOS
    type === 'RCTText' ||
    type === 'RCTVirtualText';

  // TODO: If this is an offscreen host container, we should reuse the
  // parent context.

  if (prevIsInAParentText !== isInAParentText) {
    return {isInAParentText};
  } else {
    return parentHostContext;
  }
}

export function getPublicInstance(instance: Instance): null | PublicInstance {
  if (instance.canonical != null && instance.canonical.publicInstance != null) {
    return instance.canonical.publicInstance;
  }

  // For compatibility with the legacy renderer, in case it's used with Fabric
  // in the same app.
  // $FlowExpectedError[prop-missing]
  if (instance._nativeTag != null) {
    // $FlowExpectedError[incompatible-return]
    return instance;
  }

  return null;
}

function getPublicTextInstance(
  textInstance: TextInstance,
  internalInstanceHandle: InternalInstanceHandle,
): PublicTextInstance {
  if (textInstance.publicInstance == null) {
    textInstance.publicInstance = createPublicTextInstance(
      internalInstanceHandle,
    );
  }
  return textInstance.publicInstance;
}

export function getPublicInstanceFromInternalInstanceHandle(
  internalInstanceHandle: InternalInstanceHandle,
): null | PublicInstance | PublicTextInstance {
  if (internalInstanceHandle.tag === HostText) {
    const textInstance: TextInstance = internalInstanceHandle.stateNode;
    return getPublicTextInstance(textInstance, internalInstanceHandle);
  }

  const instance: Instance = internalInstanceHandle.stateNode;
  return getPublicInstance(instance);
}

export function prepareForCommit(containerInfo: Container): null | Object {
  // Noop
  return null;
}

export function prepareUpdate(
  instance: Instance,
  type: string,
  oldProps: Props,
  newProps: Props,
  hostContext: HostContext,
): null | Object {
  const viewConfig = instance.canonical.viewConfig;
  const updatePayload = diff(oldProps, newProps, viewConfig.validAttributes);
  // TODO: If the event handlers have changed, we need to update the current props
  // in the commit phase but there is no host config hook to do it yet.
  // So instead we hack it by updating it in the render phase.
  instance.canonical.currentProps = newProps;
  return updatePayload;
}

export function resetAfterCommit(containerInfo: Container): void {
  // Noop
}

export function shouldSetTextContent(type: string, props: Props): boolean {
  // TODO (bvaughn) Revisit this decision.
  // Always returning false simplifies the createInstance() implementation,
  // But creates an additional child Fiber for raw text children.
  // No additional native views are created though.
  // It's not clear to me which is better so I'm deferring for now.
  // More context @ github.com/facebook/react/pull/8560#discussion_r92111303
  return false;
}

export function getCurrentEventPriority(): * {
  const currentEventPriority = fabricGetCurrentEventPriority
    ? fabricGetCurrentEventPriority()
    : null;

  if (currentEventPriority != null) {
    switch (currentEventPriority) {
      case FabricDiscretePriority:
        return DiscreteEventPriority;
      case FabricDefaultPriority:
      default:
        return DefaultEventPriority;
    }
  }

  return DefaultEventPriority;
}

// The Fabric renderer is secondary to the existing React Native renderer.
export const isPrimaryRenderer = false;

// The Fabric renderer shouldn't trigger missing act() warnings
export const warnsIfNotActing = false;

export const scheduleTimeout = setTimeout;
export const cancelTimeout = clearTimeout;
export const noTimeout = -1;

// -------------------
//     Persistence
// -------------------

export const supportsPersistence = true;

export function cloneInstance(
  instance: Instance,
  updatePayload: null | Object,
  type: string,
  oldProps: Props,
  newProps: Props,
  internalInstanceHandle: InternalInstanceHandle,
  keepChildren: boolean,
  recyclableInstance: null | Instance,
): Instance {
  const node = instance.node;
  let clone;
  if (keepChildren) {
    if (updatePayload !== null) {
      clone = cloneNodeWithNewProps(node, updatePayload);
    } else {
      clone = cloneNode(node);
    }
  } else {
    if (updatePayload !== null) {
      clone = cloneNodeWithNewChildrenAndProps(node, updatePayload);
    } else {
      clone = cloneNodeWithNewChildren(node);
    }
  }
  return {
    node: clone,
    canonical: instance.canonical,
  };
}

export function cloneHiddenInstance(
  instance: Instance,
  type: string,
  props: Props,
  internalInstanceHandle: InternalInstanceHandle,
): Instance {
  const viewConfig = instance.canonical.viewConfig;
  const node = instance.node;
  const updatePayload = create(
    {style: {display: 'none'}},
    viewConfig.validAttributes,
  );
  return {
    node: cloneNodeWithNewProps(node, updatePayload),
    canonical: instance.canonical,
  };
}

export function cloneHiddenTextInstance(
  instance: Instance,
  text: string,
  internalInstanceHandle: InternalInstanceHandle,
): TextInstance {
  throw new Error('Not yet implemented.');
}

export function createContainerChildSet(container: Container): ChildSet {
  return createChildNodeSet(container);
}

export function appendChildToContainerChildSet(
  childSet: ChildSet,
  child: Instance | TextInstance,
): void {
  appendChildNodeToSet(childSet, child.node);
}

export function finalizeContainerChildren(
  container: Container,
  newChildren: ChildSet,
): void {
  completeRoot(container, newChildren);
}

export function replaceContainerChildren(
  container: Container,
  newChildren: ChildSet,
): void {}

export function getInstanceFromNode(node: any): empty {
  throw new Error('Not yet implemented.');
}

export function beforeActiveInstanceBlur(
  internalInstanceHandle: InternalInstanceHandle,
) {
  // noop
}

export function afterActiveInstanceBlur() {
  // noop
}

export function preparePortalMount(portalInstance: Instance): void {
  // noop
}

export function detachDeletedInstance(node: Instance): void {
  // noop
}

export function requestPostPaintCallback(callback: (time: number) => void) {
  // noop
}

export function maySuspendCommit(type: Type, props: Props): boolean {
  return false;
}

export function preloadInstance(type: Type, props: Props): boolean {
  return true;
}

export function startSuspendingCommit(): void {}

export function suspendInstance(type: Type, props: Props): void {}

export function waitForCommitToBeReady(): null {
  return null;
}

export function prepareRendererToRender(container: Container): void {
  // noop
}

export function resetRendererAfterRender() {
  // noop
}