ReactFabricHostConfig.js

/**
 * Copyright (c) Facebook, Inc. and its 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 {
  MeasureInWindowOnSuccessCallback,
  MeasureLayoutOnSuccessCallback,
  MeasureOnSuccessCallback,
  NativeMethodsMixinType,
  ReactNativeBaseComponentViewConfig,
  ReactNativeEventResponderEventType,
  ReactNativeResponderEvent,
  ReactNativeResponderContext,
} from './ReactNativeTypes';
import type {ReactEventComponentInstance} from 'shared/ReactTypes';

import {mountSafeCallback_NOT_REALLY_SAFE} from './NativeMethodsMixinUtils';
import {create, diff} from './ReactNativeAttributePayload';

import invariant from 'shared/invariant';
import warningWithoutStack from 'shared/warningWithoutStack';

import {dispatchEvent} from './ReactFabricEventEmitter';
import {
  addRootEventTypesForComponentInstance,
  mountEventResponder,
  unmountEventResponder,
} from './ReactFabricEventResponderSystem';

import {enableFlareAPI} from 'shared/ReactFeatureFlags';

// Modules provided by RN:
import {
  ReactNativeViewConfigRegistry,
  TextInputState,
  deepFreezeAndThrowOnMutationInDev,
} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';

const {
  createNode,
  cloneNode,
  cloneNodeWithNewChildren,
  cloneNodeWithNewChildrenAndProps,
  cloneNodeWithNewProps,
  createChildSet: createChildNodeSet,
  appendChild: appendChildNode,
  appendChildToSet: appendChildNodeToSet,
  completeRoot,
  registerEventHandler,
  measure: fabricMeasure,
  measureInWindow: fabricMeasureInWindow,
  measureLayout: fabricMeasureLayout,
} = 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 ReactNativeEventComponentInstance = ReactEventComponentInstance<
  ReactNativeEventResponderEventType,
  ReactNativeResponderEvent,
  ReactNativeResponderContext,
>;

type Node = Object;
export type Type = string;
export type Props = Object;
export type Instance = {
  node: Node,
  canonical: ReactFabricHostComponent,
};
export type TextInstance = {
  node: Node,
};
export type HydratableInstance = Instance | TextInstance;
export type PublicInstance = ReactFabricHostComponent;
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;

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

/**
 * This is used for refs on host components.
 */
class ReactFabricHostComponent {
  _nativeTag: number;
  viewConfig: ReactNativeBaseComponentViewConfig<>;
  currentProps: Props;
  _internalInstanceHandle: Object;

  constructor(
    tag: number,
    viewConfig: ReactNativeBaseComponentViewConfig<>,
    props: Props,
    internalInstanceHandle: Object,
  ) {
    this._nativeTag = tag;
    this.viewConfig = viewConfig;
    this.currentProps = props;
    this._internalInstanceHandle = internalInstanceHandle;
  }

  blur() {
    TextInputState.blurTextInput(this._nativeTag);
  }

  focus() {
    TextInputState.focusTextInput(this._nativeTag);
  }

  measure(callback: MeasureOnSuccessCallback) {
    fabricMeasure(
      this._internalInstanceHandle.stateNode.node,
      mountSafeCallback_NOT_REALLY_SAFE(this, callback),
    );
  }

  measureInWindow(callback: MeasureInWindowOnSuccessCallback) {
    fabricMeasureInWindow(
      this._internalInstanceHandle.stateNode.node,
      mountSafeCallback_NOT_REALLY_SAFE(this, callback),
    );
  }

  measureLayout(
    relativeToNativeNode: number | Object,
    onSuccess: MeasureLayoutOnSuccessCallback,
    onFail: () => void /* currently unused */,
  ) {
    if (
      typeof relativeToNativeNode === 'number' ||
      !(relativeToNativeNode instanceof ReactFabricHostComponent)
    ) {
      warningWithoutStack(
        false,
        'Warning: ref.measureLayout must be called with a ref to a native component.',
      );

      return;
    }

    fabricMeasureLayout(
      this._internalInstanceHandle.stateNode.node,
      relativeToNativeNode._internalInstanceHandle.stateNode.node,
      mountSafeCallback_NOT_REALLY_SAFE(this, onFail),
      mountSafeCallback_NOT_REALLY_SAFE(this, onSuccess),
    );
  }

  setNativeProps(nativeProps: Object) {
    warningWithoutStack(
      false,
      'Warning: setNativeProps is not currently supported in Fabric',
    );

    return;
  }
}

// eslint-disable-next-line no-unused-expressions
(ReactFabricHostComponent.prototype: NativeMethodsMixinType);

export * from 'shared/HostConfigWithNoMutation';
export * from 'shared/HostConfigWithNoHydration';

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: Object,
): 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 = new ReactFabricHostComponent(
    tag,
    viewConfig,
    props,
    internalInstanceHandle,
  );

  return {
    node: node,
    canonical: component,
  };
}

export function createTextInstance(
  text: string,
  rootContainerInstance: Container,
  hostContext: HostContext,
  internalInstanceHandle: Object,
): TextInstance {
  invariant(
    hostContext.isInAParentText,
    '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,
  rootContainerInstance: Container,
  hostContext: HostContext,
): boolean {
  return false;
}

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

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

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

export function getChildHostContextForEventComponent(
  parentHostContext: HostContext,
) {
  // TODO: add getChildHostContextForEventComponent implementation
  return parentHostContext;
}

export function getPublicInstance(instance: Instance): * {
  return instance.canonical;
}

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

export function prepareUpdate(
  instance: Instance,
  type: string,
  oldProps: Props,
  newProps: Props,
  rootContainerInstance: Container,
  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 shouldDeprioritizeSubtree(type: string, props: Props): boolean {
  return false;
}

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;
}

// 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: Object,
  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: Object,
): 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: Object,
): 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 mountEventComponent(
  eventComponentInstance: ReactNativeEventComponentInstance,
) {
  if (enableFlareAPI) {
    const responder = eventComponentInstance.responder;
    const {rootEventTypes} = responder;
    if (rootEventTypes !== undefined) {
      addRootEventTypesForComponentInstance(
        eventComponentInstance,
        rootEventTypes,
      );
    }
    mountEventResponder(eventComponentInstance);
  }
}

export function updateEventComponent(
  eventComponentInstance: ReactNativeEventComponentInstance,
) {
  // NO-OP, why might use this in the future
}

export function unmountEventComponent(
  eventComponentInstance: ReactNativeEventComponentInstance,
): void {
  if (enableFlareAPI) {
    // TODO stop listening to targetEventTypes
    unmountEventResponder(eventComponentInstance);
  }
}

export function getEventTargetChildElement(
  type: Symbol | number,
  props: Props,
): null {
  throw new Error('Not yet implemented.');
}

export function handleEventTarget(
  type: Symbol | number,
  props: Props,
  rootContainerInstance: Container,
  internalInstanceHandle: Object,
): boolean {
  throw new Error('Not yet implemented.');
}

export function commitEventTarget(
  type: Symbol | number,
  props: Props,
  instance: Instance,
  parentInstance: Instance,
): void {
  throw new Error('Not yet implemented.');
}