[react-interactions] Refine custom active element blur logic (#17354)

packages/react-art/src/ReactARTHostConfig.js

@@ -465,3 +465,7 @@ export function unmountFundamentalComponent(fundamentalInstance) {
 export function getInstanceFromNode(node) {
   throw new Error('Not yet implemented.');
 }
+
+export function beforeRemoveInstance(instance) {
+  // noop
+}

packages/react-dom/src/client/ReactDOMHostConfig.js

@@ -104,6 +104,12 @@ export type ChildSet = void; // Unused
 export type TimeoutHandle = TimeoutID;
 export type NoTimeout = -1;
 
+type SelectionInformation = {|
+  blurredActiveElement: null | HTMLElement,
+  focusedElem: null | HTMLElement,
+  selectionRange: mixed,
+|};
+
 import {
   enableSuspenseServerRenderer,
   enableFlareAPI,
@@ -127,7 +133,7 @@ const SUSPENSE_FALLBACK_START_DATA = '$!';
 const STYLE = 'style';
 
 let eventsEnabled: ?boolean = null;
-let selectionInformation: ?mixed = null;
+let selectionInformation: null | SelectionInformation = null;
 
 function shouldAutoFocusHostComponent(type: string, props: Props): boolean {
   switch (type) {
@@ -205,6 +211,13 @@ export function prepareForCommit(containerInfo: Container): void {
 
 export function resetAfterCommit(containerInfo: Container): void {
   restoreSelection(selectionInformation);
+  if (enableFlareAPI) {
+    const blurredActiveElement = (selectionInformation: any)
+      .blurredActiveElement;
+    if (blurredActiveElement !== null) {
+      dispatchActiveElementBlur(blurredActiveElement);
+    }
+  }
   selectionInformation = null;
   ReactBrowserEventEmitterSetEnabled(eventsEnabled);
   eventsEnabled = null;
@@ -452,38 +465,57 @@ export function insertInContainerBefore(
   }
 }
 
+function dispatchFlareDetachedBlurEvent(
+  elementDetached: boolean,
+  targetInstance: null | Object,
+  target: Element | Document,
+): void {
+  // Simlulate the custom event to the React Flare responder system.
+  dispatchEventForResponderEventSystem(
+    'blur',
+    targetInstance,
+    ({
+      elementDetached,
+      target,
+      timeStamp: Date.now(),
+    }: any),
+    target,
+    RESPONDER_EVENT_SYSTEM | IS_PASSIVE,
+  );
+}
+
+function dispatchBeforeActiveElementBlur(element: HTMLElement): void {
+  const targtInstance = getClosestInstanceFromNode(element);
+  ((selectionInformation: any): SelectionInformation).blurredActiveElement = element;
+  dispatchFlareDetachedBlurEvent(false, targtInstance, element);
+}
+
+function dispatchActiveElementBlur(
+  node: Instance | TextInstance | SuspenseInstance,
+): void {
+  dispatchFlareDetachedBlurEvent(true, null, ((node: any): HTMLElement));
+}
+
 // This is a specific event for the React Flare
 // event system, so event responders can act
 // accordingly to a DOM node being unmounted that
 // previously had active document focus.
-function dispatchDetachedVisibleNodeEvent(
-  child: Instance | TextInstance | SuspenseInstance,
+export function beforeRemoveInstance(
+  instance: Instance | TextInstance | SuspenseInstance,
 ): void {
   if (
     enableFlareAPI &&
     selectionInformation &&
-    child === selectionInformation.focusedElem
+    instance === selectionInformation.focusedElem
   ) {
-    const targetFiber = getClosestInstanceFromNode(child);
-    // Simlulate a blur event to the React Flare responder system.
-    dispatchEventForResponderEventSystem(
-      'detachedvisiblenode',
-      targetFiber,
-      ({
-        target: child,
-        timeStamp: Date.now(),
-      }: any),
-      ((child: any): Document | Element),
-      RESPONDER_EVENT_SYSTEM | IS_PASSIVE,
-    );
+    dispatchBeforeActiveElementBlur(((instance: any): HTMLElement));
   }
 }
 
 export function removeChild(
   parentInstance: Instance,
   child: Instance | TextInstance | SuspenseInstance,
 ): void {
-  dispatchDetachedVisibleNodeEvent(child);
   parentInstance.removeChild(child);
 }
 
@@ -494,7 +526,6 @@ export function removeChildFromContainer(
   if (container.nodeType === COMMENT_NODE) {
     (container.parentNode: any).removeChild(child);
   } else {
-    dispatchDetachedVisibleNodeEvent(child);
     container.removeChild(child);
   }
 }

packages/react-dom/src/client/ReactInputSelection.js

@@ -100,6 +100,8 @@ export function hasSelectionCapabilities(elem) {
 export function getSelectionInformation() {
   const focusedElem = getActiveElementDeep();
   return {
+    // Used by Flare
+    blurredActiveElement: null,
     focusedElem: focusedElem,
     selectionRange: hasSelectionCapabilities(focusedElem)
       ? getSelection(focusedElem)

packages/react-interactions/events/src/dom/Focus.js

@@ -45,28 +45,25 @@ type FocusProps = {
   onFocusVisibleChange: boolean => void,
 };
 
-type FocusEventType =
-  | 'focus'
-  | 'blur'
-  | 'focuschange'
-  | 'focusvisiblechange'
-  | 'detachedvisiblenode';
+type FocusEventType = 'focus' | 'blur' | 'focuschange' | 'focusvisiblechange';
 
 type FocusWithinProps = {
   disabled?: boolean,
   onFocusWithin?: (e: FocusEvent) => void,
   onBlurWithin?: (e: FocusEvent) => void,
   onFocusWithinChange?: boolean => void,
   onFocusWithinVisibleChange?: boolean => void,
-  onDetachedVisibleNode?: (e: FocusEvent) => void,
+  onBeforeFocusedElementDetached?: (e: FocusEvent) => void,
+  onFocusedElementDetached?: (e: FocusEvent) => void,
 };
 
 type FocusWithinEventType =
   | 'focuswithinvisiblechange'
   | 'focuswithinchange'
   | 'blurwithin'
   | 'focuswithin'
-  | 'detachedvisiblenode';
+  | 'focusedelementdetached'
+  | 'beforefocusedelementdetached';
 
 /**
  * Shared between Focus and FocusWithin
@@ -79,14 +76,22 @@ const isMac =
     ? /^Mac/.test(window.navigator.platform)
     : false;
 
-const targetEventTypes = ['focus', 'blur', 'detachedvisiblenode'];
+const targetEventTypes = ['focus', 'blur'];
 
 const hasPointerEvents =
   typeof window !== 'undefined' && window.PointerEvent != null;
 
 const rootEventTypes = hasPointerEvents
-  ? ['keydown', 'keyup', 'pointermove', 'pointerdown', 'pointerup']
-  : ['keydown', 'keyup', 'mousedown', 'touchmove', 'touchstart', 'touchend'];
+  ? ['keydown', 'keyup', 'pointermove', 'pointerdown', 'pointerup', 'blur']
+  : [
+      'keydown',
+      'keyup',
+      'mousedown',
+      'touchmove',
+      'touchstart',
+      'touchend',
+      'blur',
+    ];
 
 function isFunction(obj): boolean {
   return typeof obj === 'function';
@@ -504,6 +509,23 @@ const focusWithinResponderImpl = {
         break;
       }
       case 'blur': {
+        if ((nativeEvent: any).elementDetached === false) {
+          const onBeforeFocusedElementDetached = (props.onBeforeFocusedElementDetached: any);
+          if (isFunction(onBeforeFocusedElementDetached)) {
+            const syntheticEvent = createFocusEvent(
+              context,
+              'beforefocusedelementdetached',
+              event.target,
+              state.pointerType,
+            );
+            context.dispatchEvent(
+              syntheticEvent,
+              onBeforeFocusedElementDetached,
+              DiscreteEvent,
+            );
+          }
+          return;
+        }
         if (
           state.isFocused &&
           !context.isTargetWithinResponder(relatedTarget)
@@ -514,22 +536,6 @@ const focusWithinResponderImpl = {
         }
         break;
       }
-      case 'detachedvisiblenode': {
-        const onDetachedVisibleNode = (props.onDetachedVisibleNode: any);
-        if (isFunction(onDetachedVisibleNode)) {
-          const syntheticEvent = createFocusEvent(
-            context,
-            'detachedvisiblenode',
-            event.target,
-            state.pointerType,
-          );
-          context.dispatchEvent(
-            syntheticEvent,
-            onDetachedVisibleNode,
-            DiscreteEvent,
-          );
-        }
-      }
     }
   },
   onRootEvent(
@@ -538,6 +544,23 @@ const focusWithinResponderImpl = {
     props: FocusWithinProps,
     state: FocusState,
   ): void {
+    if ((event.nativeEvent: any).elementDetached === true) {
+      const onFocusedElementDetached = (props.onFocusedElementDetached: any);
+      if (isFunction(onFocusedElementDetached)) {
+        const syntheticEvent = createFocusEvent(
+          context,
+          'focusedelementdetached',
+          event.target,
+          state.pointerType,
+        );
+        context.dispatchEvent(
+          syntheticEvent,
+          onFocusedElementDetached,
+          DiscreteEvent,
+        );
+      }
+      return;
+    }
     handleRootEvent(event, context, state, isFocusVisible => {
       if (state.isFocused && state.isFocusVisible !== isFocusVisible) {
         state.isFocusVisible = isFocusVisible;

packages/react-interactions/events/src/dom/__tests__/FocusWithin-test.internal.js

@@ -262,37 +262,77 @@ describe.each(table)('FocusWithin responder', hasPointerEvents => {
     });
   });
 
-  describe('onDetachedVisibleNode', () => {
-    let onDetachedVisibleNode, ref, innerRef, innerRef2;
-
-    const Component = ({show}) => {
-      const listener = useFocusWithin({
-        onDetachedVisibleNode,
-      });
-      return (
-        <div ref={ref} listeners={listener}>
-          {show && <input ref={innerRef} />}
-          <div ref={innerRef2} />
-        </div>
-      );
-    };
+  describe('onBeforeFocusedElementDetached/onFocusedElementDetached', () => {
+    let onBeforeFocusedElementDetached,
+      onFocusedElementDetached,
+      ref,
+      innerRef,
+      innerRef2;
 
     beforeEach(() => {
-      onDetachedVisibleNode = jest.fn();
+      onBeforeFocusedElementDetached = jest.fn();
+      onFocusedElementDetached = jest.fn();
       ref = React.createRef();
       innerRef = React.createRef();
       innerRef2 = React.createRef();
-      ReactDOM.render(<Component show={true} />, container);
     });
 
     it('is called after a focused element is unmounted', () => {
+      const Component = ({show}) => {
+        const listener = useFocusWithin({
+          onBeforeFocusedElementDetached,
+          onFocusedElementDetached,
+        });
+        return (
+          <div ref={ref} listeners={listener}>
+            {show && <input ref={innerRef} />}
+            <div ref={innerRef2} />
+          </div>
+        );
+      };
+
+      ReactDOM.render(<Component show={true} />, container);
+
+      const inner = innerRef.current;
+      const target = createEventTarget(inner);
+      target.keydown({key: 'Tab'});
+      target.focus();
+      expect(onBeforeFocusedElementDetached).toHaveBeenCalledTimes(0);
+      expect(onFocusedElementDetached).toHaveBeenCalledTimes(0);
+      ReactDOM.render(<Component show={false} />, container);
+      expect(onBeforeFocusedElementDetached).toHaveBeenCalledTimes(1);
+      expect(onFocusedElementDetached).toHaveBeenCalledTimes(1);
+    });
+
+    it('is called after a nested focused element is unmounted', () => {
+      const Component = ({show}) => {
+        const listener = useFocusWithin({
+          onBeforeFocusedElementDetached,
+          onFocusedElementDetached,
+        });
+        return (
+          <div ref={ref} listeners={listener}>
+            {show && (
+              <div>
+                <input ref={innerRef} />
+              </div>
+            )}
+            <div ref={innerRef2} />
+          </div>
+        );
+      };
+
+      ReactDOM.render(<Component show={true} />, container);
+
       const inner = innerRef.current;
       const target = createEventTarget(inner);
       target.keydown({key: 'Tab'});
       target.focus();
-      expect(onDetachedVisibleNode).toHaveBeenCalledTimes(0);
+      expect(onBeforeFocusedElementDetached).toHaveBeenCalledTimes(0);
+      expect(onFocusedElementDetached).toHaveBeenCalledTimes(0);
       ReactDOM.render(<Component show={false} />, container);
-      expect(onDetachedVisibleNode).toHaveBeenCalledTimes(1);
+      expect(onBeforeFocusedElementDetached).toHaveBeenCalledTimes(1);
+      expect(onFocusedElementDetached).toHaveBeenCalledTimes(1);
     });
   });
 

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

@@ -495,3 +495,7 @@ export function cloneFundamentalInstance(fundamentalInstance) {
 export function getInstanceFromNode(node) {
   throw new Error('Not yet implemented.');
 }
+
+export function beforeRemoveInstance(instance) {
+  // noop
+}

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

@@ -534,3 +534,7 @@ export function unmountFundamentalComponent(fundamentalInstance) {
 export function getInstanceFromNode(node) {
   throw new Error('Not yet implemented.');
 }
+
+export function beforeRemoveInstance(instance) {
+  // noop
+}

packages/react-reconciler/src/ReactFiberCommitWork.js

@@ -105,6 +105,7 @@ import {
   updateFundamentalComponent,
   commitHydratedContainer,
   commitHydratedSuspenseInstance,
+  beforeRemoveInstance,
 } from './ReactFiberHostConfig';
 import {
   captureCommitPhaseError,
@@ -808,6 +809,7 @@ function commitUnmount(
             dependencies.responders = null;
           }
         }
+        beforeRemoveInstance(current.stateNode);
       }
       safelyDetachRef(current);
       return;