[React Native] Add getInspectorDataForViewAtPoint

packages/react-native-renderer/src/ReactFabric.js

@@ -34,7 +34,10 @@ import ReactVersion from 'shared/ReactVersion';
 import {UIManager} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
 
 import {getClosestInstanceFromNode} from './ReactFabricComponentTree';
-import {getInspectorDataForViewTag} from './ReactNativeFiberInspector';
+import {
+  getInspectorDataForViewAtPoint,
+  getInspectorDataForViewTag,
+} from './ReactNativeFiberInspector';
 
 import {LegacyRoot} from 'shared/ReactRootTags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
@@ -233,6 +236,10 @@ export {
 injectIntoDevTools({
   findFiberByHostInstance: getClosestInstanceFromNode,
   getInspectorDataForViewTag: getInspectorDataForViewTag,
+  getInspectorDataForViewAtPoint: getInspectorDataForViewAtPoint.bind(
+    null,
+    findNodeHandle,
+  ),
   bundleType: __DEV__ ? 1 : 0,
   version: ReactVersion,
   rendererPackageName: 'react-native-renderer',

packages/react-native-renderer/src/ReactNativeFiberHostComponent.js

@@ -34,11 +34,17 @@ class ReactNativeFiberHostComponent {
   _children: Array<Instance | number>;
   _nativeTag: number;
   viewConfig: ReactNativeBaseComponentViewConfig<>;
+  _internalFiberInstanceHandle: Object;
 
-  constructor(tag: number, viewConfig: ReactNativeBaseComponentViewConfig<>) {
+  constructor(
+    tag: number,
+    viewConfig: ReactNativeBaseComponentViewConfig<>,
+    internalInstanceHandle: Object,
+  ) {
     this._nativeTag = tag;
     this._children = [];
     this.viewConfig = viewConfig;
+    this._internalFiberInstanceHandle = internalInstanceHandle;
   }
 
   blur() {

packages/react-native-renderer/src/ReactNativeFiberInspector.js

@@ -8,6 +8,7 @@
  */
 
 import type {Fiber} from 'react-reconciler/src/ReactFiber';
+import type {TouchedViewDataAtPoint} from './ReactNativeTypes';
 
 import {
   findCurrentHostFiber,
@@ -27,6 +28,7 @@ if (__DEV__) {
 }
 
 let getInspectorDataForViewTag;
+let getInspectorDataForViewAtPoint;
 
 if (__DEV__) {
   const traverseOwnerTreeUp = function(hierarchy, instance: any) {
@@ -89,6 +91,34 @@ if (__DEV__) {
     }));
   };
 
+  const getInspectorDataForInstance = function(closestInstance, frame): Object {
+    // Handle case where user clicks outside of ReactNative
+    if (!closestInstance) {
+      return {
+        hierarchy: [],
+        props: emptyObject,
+        selection: null,
+        source: null,
+      };
+    }
+
+    const fiber = findCurrentFiberUsingSlowPath(closestInstance);
+    const fiberHierarchy = getOwnerHierarchy(fiber);
+    const instance = lastNonHostInstance(fiberHierarchy);
+    const hierarchy = createHierarchy(fiberHierarchy);
+    const props = getHostProps(instance);
+    const source = instance._debugSource;
+    const selection = fiberHierarchy.indexOf(instance);
+
+    return {
+      hierarchy,
+      frame,
+      props,
+      selection,
+      source,
+    };
+  };
+
   getInspectorDataForViewTag = function(viewTag: number): Object {
     const closestInstance = getClosestInstanceFromNode(viewTag);
 
@@ -117,13 +147,93 @@ if (__DEV__) {
       source,
     };
   };
+
+  getInspectorDataForViewAtPoint = function(
+    findNodeHandle: (componentOrHandle: any) => ?number,
+    inspectedView: Object,
+    locationX: number,
+    locationY: number,
+    callback: (viewData: TouchedViewDataAtPoint) => mixed,
+  ): void {
+    let closestInstance = null;
+    let frame = {
+      left: 0,
+      top: 0,
+      width: 0,
+      height: 0,
+    };
+
+    if (inspectedView._internalInstanceHandle != null) {
+      // For Fabric we can look up the instance handle directly and measure it.
+      nativeFabricUIManager.findNodeAtPoint(
+        inspectedView._internalInstanceHandle.stateNode.node,
+        locationX,
+        locationY,
+        shadowNode => {
+          if (shadowNode == null) {
+            callback(getInspectorDataForInstance(closestInstance, frame));
+          }
+
+          closestInstance =
+            shadowNode.stateNode.canonical._internalInstanceHandle;
+          nativeFabricUIManager.measure(
+            shadowNode.stateNode.node,
+            (x, y, width, height, pageX, pageY) => {
+              const inspectorData = getInspectorDataForInstance(
+                closestInstance,
+              );
+              callback({
+                ...inspectorData,
+                frame: {left: pageX, top: pageY, width, height},
+              });
+            },
+          );
+        },
+      );
+    } else if (inspectedView._internalFiberInstanceHandle != null) {
+      // For Paper we fall back to the old strategy using the React tag.
+      UIManager.findSubviewIn(
+        findNodeHandle(inspectedView),
+        [locationX, locationY],
+        (nativeViewTag, left, top, width, height) => {
+          const inspectorData = getInspectorDataForInstance(
+            getClosestInstanceFromNode(nativeViewTag),
+          );
+          callback({
+            ...inspectorData,
+            frame: {left, top, width, height},
+            touchedViewTag: nativeViewTag,
+          });
+        },
+      );
+    } else if (__DEV__) {
+      console.error(
+        'getInspectorDataForViewAtPoint expects to receieve a host component',
+      );
+
+      return;
+    }
+  };
 } else {
   getInspectorDataForViewTag = () => {
     invariant(
       false,
       'getInspectorDataForViewTag() is not available in production',
     );
   };
+
+  getInspectorDataForViewAtPoint = (
+    findNodeHandle: (componentOrHandle: any) => ?number,
+    inspectedView: Object,
+    locationX: number,
+    locationY: number,
+    callback: (viewData: TouchedViewDataAtPoint) => mixed,
+  ): void => {
+    invariant(
+      false,
+      'getInspectorDataForViewAtPoint() is not available in production',
+    );
+  };
 }
 
-export {getInspectorDataForViewTag};
+export {getInspectorDataForViewAtPoint, getInspectorDataForViewTag};

packages/react-native-renderer/src/ReactNativeHostConfig.js

@@ -108,7 +108,11 @@ export function createInstance(
     updatePayload, // props
   );
 
-  const component = new ReactNativeFiberHostComponent(tag, viewConfig);
+  const component = new ReactNativeFiberHostComponent(
+    tag,
+    viewConfig,
+    internalInstanceHandle,
+  );
 
   precacheFiberNode(internalInstanceHandle, tag);
   updateFiberProps(tag, props);

packages/react-native-renderer/src/ReactNativeRenderer.js

@@ -36,7 +36,10 @@ import ReactVersion from 'shared/ReactVersion';
 import {UIManager} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
 
 import {getClosestInstanceFromNode} from './ReactNativeComponentTree';
-import {getInspectorDataForViewTag} from './ReactNativeFiberInspector';
+import {
+  getInspectorDataForViewTag,
+  getInspectorDataForViewAtPoint,
+} from './ReactNativeFiberInspector';
 
 import {LegacyRoot} from 'shared/ReactRootTags';
 import ReactSharedInternals from 'shared/ReactSharedInternals';
@@ -247,6 +250,10 @@ export {
 injectIntoDevTools({
   findFiberByHostInstance: getClosestInstanceFromNode,
   getInspectorDataForViewTag: getInspectorDataForViewTag,
+  getInspectorDataForViewAtPoint: getInspectorDataForViewAtPoint.bind(
+    null,
+    findNodeHandle,
+  ),
   bundleType: __DEV__ ? 1 : 0,
   version: ReactVersion,
   rendererPackageName: 'react-native-renderer',

packages/react-native-renderer/src/ReactNativeTypes.js

@@ -100,6 +100,24 @@ type SecretInternalsType = {
   ...
 };
 
+export type TouchedViewDataAtPoint = $ReadOnly<{
+  hierarchy?: ?Array<{|name: string|}>,
+  pointerY: number,
+  touchedViewTag?: ?number,
+  props: $ReadOnly<{[propName: string]: string, ...}>,
+  selection: number,
+  source: $ReadOnly<{|
+    fileName?: string,
+    lineNumber?: number,
+  |}>,
+  frame?: ?$ReadOnly<{|
+    top?: ?number,
+    left?: ?number,
+    width?: ?number,
+    height: ?number,
+  |}>,
+}>;
+
 /**
  * Flat ReactNative renderer bundles are too big for Flow to parse efficiently.
  * Provide minimal Flow typing for the high-level RN API and call it a day.

packages/react-reconciler/src/ReactFiberReconciler.js

@@ -10,6 +10,7 @@
 import type {Fiber} from './ReactFiber';
 import type {FiberRoot} from './ReactFiberRoot';
 import type {RootTag} from 'shared/ReactRootTags';
+import type {TouchedViewDataAtPoint} from 'react-native-renderer/src/ReactNativeTypes';
 import type {
   Instance,
   TextInstance,
@@ -109,6 +110,13 @@ type DevToolsConfig = {|
   // This API is unfortunately RN-specific.
   // TODO: Change it to accept Fiber instead and type it properly.
   getInspectorDataForViewTag?: (tag: number) => Object,
+  // Used by RN in-app inspector.
+  getInspectorDataForViewAtPoint?: (
+    inspectedView: Object,
+    locationX: number,
+    locationY: number,
+    callback: (viewData: TouchedViewDataAtPoint) => mixed,
+  ) => void,
 |};
 
 let didWarnAboutNestedUpdates;

scripts/error-codes/codes.json

@@ -346,5 +346,6 @@
   "345": "Root did not complete. This is a bug in React.",
   "346": "An event responder context was used outside of an event cycle.",
   "347": "Maps are not valid as a React child (found: %s). Consider converting children to an array of keyed ReactElements instead.",
-  "348": "ensureListeningTo(): received a container that was not an element node. This is likely a bug in React."
+  "348": "ensureListeningTo(): received a container that was not an element node. This is likely a bug in React.",
+  "349": "getInspectorDataForViewAtPoint() is not available in production"
 }

scripts/flow/react-native-host-hooks.js

@@ -18,6 +18,7 @@ import type {
 } from 'react-native-renderer/src/ReactNativeTypes';
 import type {RNTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
 import type {CapturedError} from 'react-reconciler/src/ReactCapturedValue';
+import type {Fiber} from 'react-reconciler/src/ReactFiber';
 
 type DeepDifferOptions = {|+unsafelyIgnoreFunctions?: boolean|};
 
@@ -96,6 +97,17 @@ declare module 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface'
     ) => Promise<any>,
     setJSResponder: (reactTag: number, blockNativeResponder: boolean) => void,
     clearJSResponder: () => void,
+    findSubviewIn: (
+      reactTag: ?number,
+      point: Array<number>,
+      callback: (
+        nativeViewTag: number,
+        left: number,
+        top: number,
+        width: number,
+        height: number,
+      ) => void,
+    ) => void,
     ...
   };
   declare export var BatchedBridge: {
@@ -156,6 +168,12 @@ declare var nativeFabricUIManager: {
     onFail: () => void,
     onSuccess: MeasureLayoutOnSuccessCallback,
   ) => void,
+  findNodeAtPoint: (
+    node: Node,
+    locationX: number,
+    locationY: number,
+    callback: (Fiber) => void,
+  ) => void,
   ...
 };