Event API: use capture for all event listeners using experimental responder system

packages/events/EventSystemFlags.js

@@ -13,5 +13,4 @@ export const PLUGIN_EVENT_SYSTEM = 1;
 export const RESPONDER_EVENT_SYSTEM = 1 << 1;
 export const IS_PASSIVE = 1 << 2;
 export const IS_ACTIVE = 1 << 3;
-export const IS_CAPTURE = 1 << 4;
-export const PASSIVE_NOT_SUPPORTED = 1 << 5;
+export const PASSIVE_NOT_SUPPORTED = 1 << 4;

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

@@ -1294,7 +1294,6 @@ export function listenToEventResponderEventTypes(
     for (let i = 0, length = eventTypes.length; i < length; ++i) {
       const targetEventType = eventTypes[i];
       let topLevelType;
-      let capture = false;
       let passive = true;
 
       // If no event config object is provided (i.e. - only a string),
@@ -1313,26 +1312,17 @@ export function listenToEventResponderEventTypes(
         const targetEventConfigObject = ((targetEventType: any): {
           name: string,
           passive?: boolean,
-          capture?: boolean,
         });
         topLevelType = targetEventConfigObject.name;
         if (targetEventConfigObject.passive !== undefined) {
           passive = targetEventConfigObject.passive;
         }
-        if (targetEventConfigObject.capture !== undefined) {
-          capture = targetEventConfigObject.capture;
-        }
       }
-      const listeningName = generateListeningKey(
-        topLevelType,
-        passive,
-        capture,
-      );
+      const listeningName = generateListeningKey(topLevelType, passive);
       if (!listeningSet.has(listeningName)) {
         trapEventForResponderEventSystem(
           element,
           ((topLevelType: any): DOMTopLevelEventType),
-          capture,
           passive,
         );
         listeningSet.add(listeningName);

packages/react-dom/src/events/DOMEventResponderSystem.js

@@ -9,7 +9,6 @@
 import {
   type EventSystemFlags,
   IS_PASSIVE,
-  IS_CAPTURE,
   PASSIVE_NOT_SUPPORTED,
 } from 'events/EventSystemFlags';
 import type {AnyNativeEvent} from 'events/PluginModuleType';
@@ -247,28 +246,22 @@ const eventResponderContext: ReactResponderContext = {
     for (let i = 0; i < rootEventTypes.length; i++) {
       const rootEventType = rootEventTypes[i];
       let name = rootEventType;
-      let capture = false;
       let passive = true;
 
       if (typeof rootEventType !== 'string') {
         const targetEventConfigObject = ((rootEventType: any): {
           name: string,
           passive?: boolean,
-          capture?: boolean,
         });
         name = targetEventConfigObject.name;
         if (targetEventConfigObject.passive !== undefined) {
           passive = targetEventConfigObject.passive;
         }
-        if (targetEventConfigObject.capture !== undefined) {
-          capture = targetEventConfigObject.capture;
-        }
       }
 
       const listeningName = generateListeningKey(
         ((name: any): string),
         passive,
-        capture,
       );
       let rootEventComponents = rootEventTypesToEventComponentInstances.get(
         listeningName,
@@ -537,27 +530,21 @@ function getTargetEventTypesSet(
     for (let i = 0; i < eventTypes.length; i++) {
       const eventType = eventTypes[i];
       let name = eventType;
-      let capture = false;
       let passive = true;
 
       if (typeof eventType !== 'string') {
         const targetEventConfigObject = ((eventType: any): {
           name: string,
           passive?: boolean,
-          capture?: boolean,
         });
         name = targetEventConfigObject.name;
         if (targetEventConfigObject.passive !== undefined) {
           passive = targetEventConfigObject.passive;
         }
-        if (targetEventConfigObject.capture !== undefined) {
-          capture = targetEventConfigObject.capture;
-        }
       }
       const listeningName = generateListeningKey(
         ((name: any): string),
         passive,
-        capture,
       );
       cachedSet.add(listeningName);
     }
@@ -640,12 +627,10 @@ function traverseAndHandleEventResponderInstances(
   eventSystemFlags: EventSystemFlags,
 ): void {
   const isPassiveEvent = (eventSystemFlags & IS_PASSIVE) !== 0;
-  const isCaptureEvent = (eventSystemFlags & IS_CAPTURE) !== 0;
   const isPassiveSupported = (eventSystemFlags & PASSIVE_NOT_SUPPORTED) === 0;
   const listeningName = generateListeningKey(
     ((topLevelType: any): string),
     isPassiveEvent || !isPassiveSupported,
-    isCaptureEvent,
   );
 
   // Trigger event responders in this order:
@@ -875,29 +860,20 @@ function registerRootEventType(
   eventComponentInstance: ReactEventComponentInstance,
 ): void {
   let name = rootEventType;
-  let capture = false;
   let passive = true;
 
   if (typeof rootEventType !== 'string') {
     const targetEventConfigObject = ((rootEventType: any): {
       name: string,
       passive?: boolean,
-      capture?: boolean,
     });
     name = targetEventConfigObject.name;
     if (targetEventConfigObject.passive !== undefined) {
       passive = targetEventConfigObject.passive;
     }
-    if (targetEventConfigObject.capture !== undefined) {
-      capture = targetEventConfigObject.capture;
-    }
   }
 
-  const listeningName = generateListeningKey(
-    ((name: any): string),
-    passive,
-    capture,
-  );
+  const listeningName = generateListeningKey(((name: any): string), passive);
   let rootEventComponentInstances = rootEventTypesToEventComponentInstances.get(
     listeningName,
   );
@@ -928,12 +904,10 @@ function registerRootEventType(
 export function generateListeningKey(
   topLevelType: string,
   passive: boolean,
-  capture: boolean,
 ): string {
   // Create a unique name for this event, plus its properties. We'll
   // use this to ensure we don't listen to the same event with the same
   // properties again.
   const passiveKey = passive ? '_passive' : '_active';
-  const captureKey = capture ? '_capture' : '';
-  return `${topLevelType}${passiveKey}${captureKey}`;
+  return `${topLevelType}${passiveKey}`;
 }

packages/react-dom/src/events/EventListener.js

@@ -23,11 +23,14 @@ export function addEventCaptureListener(
   element.addEventListener(eventType, listener, true);
 }
 
-export function addEventListener(
+export function addEventCaptureListenerWithPassiveFlag(
   element: Document | Element | Node,
   eventType: string,
   listener: Function,
-  options: {passive: boolean},
+  passive: boolean,
 ): void {
-  element.addEventListener(eventType, listener, (options: any));
+  element.addEventListener(eventType, listener, {
+    capture: true,
+    passive,
+  });
 }

packages/react-dom/src/events/ReactDOMEventListener.js

@@ -22,14 +22,13 @@ import {
   RESPONDER_EVENT_SYSTEM,
   IS_PASSIVE,
   IS_ACTIVE,
-  IS_CAPTURE,
   PASSIVE_NOT_SUPPORTED,
 } from 'events/EventSystemFlags';
 
 import {
   addEventBubbleListener,
   addEventCaptureListener,
-  addEventListener,
+  addEventCaptureListenerWithPassiveFlag,
 } from './EventListener';
 import getEventTarget from './getEventTarget';
 import {getClosestInstanceFromNode} from '../client/ReactDOMComponentTree';
@@ -168,7 +167,6 @@ export function trapCapturedEvent(
 export function trapEventForResponderEventSystem(
   element: Document | Element | Node,
   topLevelType: DOMTopLevelEventType,
-  capture: boolean,
   passive: boolean,
 ): void {
   if (enableEventAPI) {
@@ -190,15 +188,18 @@ export function trapEventForResponderEventSystem(
     } else {
       eventFlags |= IS_ACTIVE;
     }
-    if (capture) {
-      eventFlags |= IS_CAPTURE;
-    }
     // Check if interactive and wrap in interactiveUpdates
     const listener = dispatchEvent.bind(null, topLevelType, eventFlags);
-    addEventListener(element, rawEventName, listener, {
-      capture,
-      passive,
-    });
+    if (passiveBrowserEventsSupported) {
+      addEventCaptureListenerWithPassiveFlag(
+        element,
+        rawEventName,
+        listener,
+        passive,
+      );
+    } else {
+      addEventCaptureListener(element, rawEventName, listener);
+    }
   }
 }
 

packages/react-dom/src/events/forks/EventListener-www.js

@@ -12,8 +12,6 @@ const EventListenerWWW = require('EventListener');
 import typeof * as EventListenerType from '../EventListener';
 import typeof * as EventListenerShimType from './EventListener-www';
 
-const NORMAL_PRIORITY = 0;
-
 export function addEventBubbleListener(
   element: Element,
   eventType: string,
@@ -30,18 +28,17 @@ export function addEventCaptureListener(
   EventListenerWWW.capture(element, eventType, listener);
 }
 
-export function addEventListener(
+export function addEventCaptureListenerWithPassiveFlag(
   element: Element,
   eventType: string,
   listener: Function,
-  options: {passive: boolean},
+  passive: boolean,
 ): void {
-  EventListenerWWW.listen(
+  EventListenerWWW.captureWithPassiveFlag(
     element,
     eventType,
     listener,
-    NORMAL_PRIORITY,
-    options,
+    passive,
   );
 }
 

packages/react-events/README.md

@@ -34,7 +34,7 @@ events, and implement a state machine.
 // types
 type ResponderEventType =
   | string
-  | {name: string, passive?: boolean, capture?: boolean};
+  | {name: string, passive?: boolean};
 
 type ResponderEvent = {|
   nativeEvent: any,

packages/react-events/src/Focus.js

@@ -34,8 +34,8 @@ type FocusEvent = {|
 |};
 
 const targetEventTypes = [
-  {name: 'focus', passive: true, capture: true},
-  {name: 'blur', passive: true, capture: true},
+  {name: 'focus', passive: true},
+  {name: 'blur', passive: true},
 ];
 
 function createFocusEvent(

packages/react-events/src/FocusScope.js

@@ -25,7 +25,7 @@ type FocusScopeState = {
 };
 
 const targetEventTypes = [{name: 'keydown', passive: false}];
-const rootEventTypes = [{name: 'focus', passive: true, capture: true}];
+const rootEventTypes = [{name: 'focus', passive: true}];
 
 function focusElement(element: ?HTMLElement) {
   if (element != null) {

packages/react-events/src/__tests__/Press-test.internal.js

@@ -1269,13 +1269,13 @@ describe('Event responder: Press', () => {
         createPointerEvent('pointerup', {pageX: 10, pageY: 10}),
       );
       expect(events).toEqual([
-        'pointerdown',
         'inner: onPressStart',
         'inner: onPressChange',
-        'pointerup',
+        'pointerdown',
         'inner: onPressEnd',
         'inner: onPressChange',
         'inner: onPress',
+        'pointerup',
       ]);
     });
 

packages/shared/ReactTypes.js

@@ -83,7 +83,7 @@ export type RefObject = {|
 
 export type ReactEventResponderEventType =
   | string
-  | {name: string, passive?: boolean, capture?: boolean};
+  | {name: string, passive?: boolean};
 
 export type ReactEventResponder = {
   targetEventTypes?: Array<ReactEventResponderEventType>,

scripts/flow/environment.js

@@ -39,5 +39,11 @@ declare module 'EventListener' {
       options?: {passive: boolean},
     ) => mixed,
     capture: (target: Element, type: string, callback: Function) => mixed,
+    captureWithPassiveFlag: (
+      target: Element,
+      type: string,
+      callback: Function,
+      passive: boolean,
+    ) => mixed,
   };
 }