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DOMModernPluginEventSystem.js
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DOMModernPluginEventSystem.js
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/**
* 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 {AnyNativeEvent} from 'legacy-events/PluginModuleType';
import type {DOMTopLevelEventType} from 'legacy-events/TopLevelEventTypes';
import type {
ElementListenerMap,
ElementListenerMapEntry,
} from '../events/DOMEventListenerMap';
import type {EventSystemFlags} from './EventSystemFlags';
import type {EventPriority, ReactScopeMethods} from 'shared/ReactTypes';
import type {Fiber} from 'react-reconciler/src/ReactFiber';
import type {PluginModule} from 'legacy-events/PluginModuleType';
import type {
ReactSyntheticEvent,
CustomDispatchConfig,
} from 'legacy-events/ReactSyntheticEventType';
import type {ReactDOMListener} from '../shared/ReactDOMTypes';
import {registrationNameDependencies} from 'legacy-events/EventPluginRegistry';
import {plugins} from 'legacy-events/EventPluginRegistry';
import {
PLUGIN_EVENT_SYSTEM,
LEGACY_FB_SUPPORT,
IS_REPLAYED,
IS_TARGET_PHASE_ONLY,
USE_EVENT_SYSTEM,
} from './EventSystemFlags';
import {HostRoot, HostPortal} from 'react-reconciler/src/ReactWorkTags';
import {
addTrappedEventListener,
removeTrappedEventListener,
} from './ReactDOMEventListener';
import getEventTarget from './getEventTarget';
import {getListenerMapForElement} from './DOMEventListenerMap';
import {
TOP_FOCUS,
TOP_LOAD,
TOP_ABORT,
TOP_CANCEL,
TOP_INVALID,
TOP_BLUR,
TOP_SCROLL,
TOP_CLOSE,
TOP_RESET,
TOP_SUBMIT,
TOP_CAN_PLAY,
TOP_CAN_PLAY_THROUGH,
TOP_DURATION_CHANGE,
TOP_EMPTIED,
TOP_ENCRYPTED,
TOP_ENDED,
TOP_ERROR,
TOP_WAITING,
TOP_VOLUME_CHANGE,
TOP_TIME_UPDATE,
TOP_SUSPEND,
TOP_STALLED,
TOP_SEEKING,
TOP_SEEKED,
TOP_PLAY,
TOP_PAUSE,
TOP_LOAD_START,
TOP_LOADED_DATA,
TOP_LOADED_METADATA,
TOP_RATE_CHANGE,
TOP_PROGRESS,
TOP_PLAYING,
TOP_CLICK,
TOP_BEFORE_BLUR,
TOP_AFTER_BLUR,
} from './DOMTopLevelEventTypes';
import {
getClosestInstanceFromNode,
getListenersFromTarget,
initListenersSet,
} from '../client/ReactDOMComponentTree';
import {COMMENT_NODE} from '../shared/HTMLNodeType';
import {topLevelEventsToDispatchConfig} from './DOMEventProperties';
import {batchedEventUpdates} from './ReactDOMUpdateBatching';
import {
enableLegacyFBSupport,
enableUseEventAPI,
} from 'shared/ReactFeatureFlags';
import {
invokeGuardedCallbackAndCatchFirstError,
rethrowCaughtError,
} from 'shared/ReactErrorUtils';
const capturePhaseEvents = new Set([
TOP_FOCUS,
TOP_BLUR,
TOP_SCROLL,
TOP_LOAD,
TOP_ABORT,
TOP_CANCEL,
TOP_CLOSE,
TOP_INVALID,
TOP_RESET,
TOP_SUBMIT,
TOP_ABORT,
TOP_CAN_PLAY,
TOP_CAN_PLAY_THROUGH,
TOP_DURATION_CHANGE,
TOP_EMPTIED,
TOP_ENCRYPTED,
TOP_ENDED,
TOP_ERROR,
TOP_LOADED_DATA,
TOP_LOADED_METADATA,
TOP_LOAD_START,
TOP_PAUSE,
TOP_PLAY,
TOP_PLAYING,
TOP_PROGRESS,
TOP_RATE_CHANGE,
TOP_SEEKED,
TOP_SEEKING,
TOP_STALLED,
TOP_SUSPEND,
TOP_TIME_UPDATE,
TOP_VOLUME_CHANGE,
TOP_WAITING,
]);
if (enableUseEventAPI) {
capturePhaseEvents.add(TOP_BEFORE_BLUR);
capturePhaseEvents.add(TOP_AFTER_BLUR);
}
const emptyDispatchConfigForCustomEvents: CustomDispatchConfig = {
customEvent: true,
phasedRegistrationNames: {
bubbled: null,
captured: null,
},
};
const isArray = Array.isArray;
// TODO: we should remove the FlowFixMes and the casting to figure out how to make
// these patterns work properly.
// $FlowFixMe: Flow struggles with this pattern, so we also have to cast it.
const PossiblyWeakMap = ((typeof WeakMap === 'function' ? WeakMap : Map): any);
// $FlowFixMe: Flow cannot handle polymorphic WeakMaps
export const eventTargetEventListenerStore: WeakMap<
EventTarget,
Map<
DOMTopLevelEventType,
{bubbled: Set<ReactDOMListener>, captured: Set<ReactDOMListener>},
>,
> = new PossiblyWeakMap();
// $FlowFixMe: Flow cannot handle polymorphic WeakMaps
export const reactScopeListenerStore: WeakMap<
ReactScopeMethods,
Map<
DOMTopLevelEventType,
{bubbled: Set<ReactDOMListener>, captured: Set<ReactDOMListener>},
>,
> = new PossiblyWeakMap();
function executeDispatch(
event: ReactSyntheticEvent,
listener: Function,
currentTarget: EventTarget,
): void {
const type = event.type || 'unknown-event';
event.currentTarget = currentTarget;
invokeGuardedCallbackAndCatchFirstError(type, listener, undefined, event);
event.currentTarget = null;
}
function executeDispatchesInOrder(event: ReactSyntheticEvent): void {
// TODO we should remove _dispatchListeners and _dispatchInstances at some point.
const dispatchListeners = event._dispatchListeners;
const dispatchInstances = event._dispatchInstances;
const dispatchCurrentTargets = event._dispatchCurrentTargets;
let previousInstance;
if (
dispatchListeners !== null &&
dispatchInstances !== null &&
dispatchCurrentTargets !== null
) {
for (let i = 0; i < dispatchListeners.length; i++) {
const instance = dispatchInstances[i];
const listener = dispatchListeners[i];
const currentTarget = dispatchCurrentTargets[i];
// We check if the instance was the same as the last one,
// if it was, then we're still on the same instance thus
// propagation should not stop. If we add support for
// stopImmediatePropagation at some point, then we'll
// need to handle that case here differently.
if (instance !== previousInstance && event.isPropagationStopped()) {
break;
}
// Listeners and Instances are two parallel arrays that are always in sync.
executeDispatch(event, listener, currentTarget);
previousInstance = instance;
}
}
event._dispatchListeners = null;
event._dispatchInstances = null;
event._dispatchCurrentTargets = null;
}
export function dispatchEventsInBatch(
events: Array<ReactSyntheticEvent>,
): void {
for (let i = 0; i < events.length; i++) {
const syntheticEvent = events[i];
executeDispatchesInOrder(syntheticEvent);
// Release the event from the pool if needed
if (!syntheticEvent.isPersistent()) {
syntheticEvent.constructor.release(syntheticEvent);
}
}
// This would be a good time to rethrow if any of the event handlers threw.
rethrowCaughtError();
}
function dispatchEventsForPlugins(
topLevelType: DOMTopLevelEventType,
eventSystemFlags: EventSystemFlags,
nativeEvent: AnyNativeEvent,
targetInst: null | Fiber,
targetContainer: EventTarget,
): void {
const nativeEventTarget = getEventTarget(nativeEvent);
const syntheticEvents: Array<ReactSyntheticEvent> = [];
for (let i = 0; i < plugins.length; i++) {
const possiblePlugin: PluginModule<AnyNativeEvent> = plugins[i];
if (possiblePlugin !== undefined) {
const extractedEvents = possiblePlugin.extractEvents(
topLevelType,
targetInst,
nativeEvent,
nativeEventTarget,
eventSystemFlags,
targetContainer,
);
if (isArray(extractedEvents)) {
// Flow complains about @@iterator being missing in ReactSyntheticEvent,
// so we cast to avoid the Flow error.
const arrOfExtractedEvents = ((extractedEvents: any): Array<ReactSyntheticEvent>);
syntheticEvents.push(...arrOfExtractedEvents);
} else if (extractedEvents != null) {
syntheticEvents.push(extractedEvents);
}
}
}
dispatchEventsInBatch(syntheticEvents);
}
function shouldUpgradeListener(
listenerEntry: void | ElementListenerMapEntry,
passive: void | boolean,
): boolean {
if (listenerEntry === undefined) {
return false;
}
// Upgrade from passive to active.
if (passive !== true && listenerEntry.passive) {
return true;
}
// Upgrade from default-active (browser default) to active.
if (passive === false && listenerEntry.passive === undefined) {
return true;
}
// Otherwise, do not upgrade
return false;
}
export function listenToTopLevelEvent(
topLevelType: DOMTopLevelEventType,
targetContainer: EventTarget,
listenerMap: ElementListenerMap,
eventSystemFlags: EventSystemFlags,
passive?: boolean,
priority?: EventPriority,
capture?: boolean,
): void {
// If we explicitly define capture, then these are for EventTarget objects,
// rather than React managed DOM elements. So we need to ensure we separate
// capture and non-capture events. For React managed DOM nodes we only use
// one or the other, never both. Which one we use is determined by the the
// capturePhaseEvents Set (in this module) that defines if the event listener
// should use the capture phase – otherwise we always use the bubble phase.
// Finally, when we get to dispatching and accumulating event listeners, we
// check if the user wanted capture/bubble and emulate the behavior at that
// point (we call this accumulating two phase listeners).
const typeStr = ((topLevelType: any): string);
const listenerMapKey =
capture === undefined
? topLevelType
: `${typeStr}_${capture ? 'capture' : 'bubble'}`;
const listenerEntry = listenerMap.get(listenerMapKey);
const shouldUpgrade = shouldUpgradeListener(listenerEntry, passive);
if (listenerEntry === undefined || shouldUpgrade) {
const isCapturePhase =
capture === undefined ? capturePhaseEvents.has(topLevelType) : capture;
// If we should upgrade, then we need to remove the existing trapped
// event listener for the target container.
if (shouldUpgrade) {
removeTrappedEventListener(
targetContainer,
topLevelType,
isCapturePhase,
((listenerEntry: any): ElementListenerMapEntry).listener,
);
}
const listener = addTrappedEventListener(
targetContainer,
topLevelType,
eventSystemFlags,
isCapturePhase,
false,
passive,
priority,
);
listenerMap.set(listenerMapKey, {passive, listener});
}
}
export function listenToEvent(
registrationName: string,
rootContainerElement: Element,
): void {
const listenerMap = getListenerMapForElement(rootContainerElement);
const dependencies = registrationNameDependencies[registrationName];
for (let i = 0; i < dependencies.length; i++) {
const dependency = dependencies[i];
listenToTopLevelEvent(
dependency,
rootContainerElement,
listenerMap,
PLUGIN_EVENT_SYSTEM,
);
}
}
function willDeferLaterForLegacyFBSupport(
topLevelType: DOMTopLevelEventType,
targetContainer: EventTarget,
): boolean {
if (topLevelType !== TOP_CLICK) {
return false;
}
// We defer all click events with legacy FB support mode on.
// This means we add a one time event listener to trigger
// after the FB delegated listeners fire.
const isDeferredListenerForLegacyFBSupport = true;
addTrappedEventListener(
targetContainer,
topLevelType,
PLUGIN_EVENT_SYSTEM | LEGACY_FB_SUPPORT,
false,
isDeferredListenerForLegacyFBSupport,
);
return true;
}
function isMatchingRootContainer(
grandContainer: Element,
targetContainer: EventTarget,
): boolean {
return (
grandContainer === targetContainer ||
(grandContainer.nodeType === COMMENT_NODE &&
grandContainer.parentNode === targetContainer)
);
}
export function isManagedDOMElement(
target: EventTarget | ReactScopeMethods,
): boolean {
return getClosestInstanceFromNode(((target: any): Node)) !== null;
}
export function isValidEventTarget(
target: EventTarget | ReactScopeMethods,
): boolean {
return typeof (target: Object).addEventListener === 'function';
}
export function isReactScope(target: EventTarget | ReactScopeMethods): boolean {
return typeof (target: Object).getChildContextValues === 'function';
}
export function dispatchEventForPluginEventSystem(
topLevelType: DOMTopLevelEventType,
eventSystemFlags: EventSystemFlags,
nativeEvent: AnyNativeEvent,
targetInst: null | Fiber,
targetContainer: EventTarget,
): void {
let ancestorInst = targetInst;
if (eventSystemFlags & IS_TARGET_PHASE_ONLY) {
// For TargetEvent nodes (i.e. document, window)
ancestorInst = null;
} else {
const targetContainerNode = ((targetContainer: any): Node);
// If we are using the legacy FB support flag, we
// defer the event to the null with a one
// time event listener so we can defer the event.
if (
enableLegacyFBSupport &&
// We do not want to defer if the event system has already been
// set to LEGACY_FB_SUPPORT. LEGACY_FB_SUPPORT only gets set when
// we call willDeferLaterForLegacyFBSupport, thus not bailing out
// will result in endless cycles like an infinite loop.
(eventSystemFlags & LEGACY_FB_SUPPORT) === 0 &&
// We also don't want to defer during event replaying.
(eventSystemFlags & IS_REPLAYED) === 0 &&
// We don't want to apply the legacy FB support for the useEvent API.
(eventSystemFlags & USE_EVENT_SYSTEM) === 0 &&
willDeferLaterForLegacyFBSupport(topLevelType, targetContainer)
) {
return;
}
if (targetInst !== null) {
// The below logic attempts to work out if we need to change
// the target fiber to a different ancestor. We had similar logic
// in the legacy event system, except the big difference between
// systems is that the modern event system now has an event listener
// attached to each React Root and React Portal Root. Together,
// the DOM nodes representing these roots are the "rootContainer".
// To figure out which ancestor instance we should use, we traverse
// up the fiber tree from the target instance and attempt to find
// root boundaries that match that of our current "rootContainer".
// If we find that "rootContainer", we find the parent fiber
// sub-tree for that root and make that our ancestor instance.
let node = targetInst;
while (true) {
if (node === null) {
return;
}
if (node.tag === HostRoot || node.tag === HostPortal) {
const container = node.stateNode.containerInfo;
if (isMatchingRootContainer(container, targetContainerNode)) {
break;
}
if (node.tag === HostPortal) {
// The target is a portal, but it's not the rootContainer we're looking for.
// Normally portals handle their own events all the way down to the root.
// So we should be able to stop now. However, we don't know if this portal
// was part of *our* root.
let grandNode = node.return;
while (grandNode !== null) {
if (grandNode.tag === HostRoot || grandNode.tag === HostPortal) {
const grandContainer = grandNode.stateNode.containerInfo;
if (
isMatchingRootContainer(grandContainer, targetContainerNode)
) {
// This is the rootContainer we're looking for and we found it as
// a parent of the Portal. That means we can ignore it because the
// Portal will bubble through to us.
return;
}
}
grandNode = grandNode.return;
}
}
const parentSubtreeInst = getClosestInstanceFromNode(container);
if (parentSubtreeInst === null) {
return;
}
node = ancestorInst = parentSubtreeInst;
continue;
}
node = node.return;
}
}
}
batchedEventUpdates(() =>
dispatchEventsForPlugins(
topLevelType,
eventSystemFlags,
nativeEvent,
ancestorInst,
targetContainer,
),
);
}
function getNearestRootOrPortalContainer(instance: Element): Element {
let node = getClosestInstanceFromNode(instance);
while (node !== null) {
const tag = node.tag;
// Once we encounter a host container or root container
// we can return their DOM instance.
if (tag === HostRoot || tag === HostPortal) {
return node.stateNode.containerInfo;
}
node = node.return;
}
return instance;
}
function addEventTypeToDispatchConfig(type: DOMTopLevelEventType): void {
const dispatchConfig = topLevelEventsToDispatchConfig.get(type);
// If we don't have a dispatchConfig, then we're dealing with
// an event type that React does not know about (i.e. a custom event).
// We need to register an event config for this or the SimpleEventPlugin
// will not appropriately provide a SyntheticEvent, so we use out empty
// dispatch config for custom events.
if (dispatchConfig === undefined) {
topLevelEventsToDispatchConfig.set(
type,
emptyDispatchConfigForCustomEvents,
);
}
}
export function attachListenerToManagedDOMElement(
listener: ReactDOMListener,
): void {
const {event, target} = listener;
const {passive, priority, type} = event;
const managedTargetElement = ((target: any): Element);
const containerEventTarget = getNearestRootOrPortalContainer(
managedTargetElement,
);
const listenerMap = getListenerMapForElement(containerEventTarget);
// Add the event listener to the target container (falling back to
// the target if we didn't find one).
listenToTopLevelEvent(
type,
containerEventTarget,
listenerMap,
PLUGIN_EVENT_SYSTEM | USE_EVENT_SYSTEM,
passive,
priority,
);
// Get the internal listeners Set from the target instance.
let listeners = getListenersFromTarget(managedTargetElement);
// If we don't have any listeners, then we need to init them.
if (listeners === null) {
listeners = new Set();
initListenersSet(managedTargetElement, listeners);
}
// Add our listener to the listeners Set.
listeners.add(listener);
// Finally, add the event to our known event types list.
addEventTypeToDispatchConfig(type);
}
export function detachListenerFromManagedDOMElement(
listener: ReactDOMListener,
): void {
const {target} = listener;
const managedTargetElement = ((target: any): Element);
// Get the internal listeners Set from the target instance.
const listeners = getListenersFromTarget(managedTargetElement);
if (listeners !== null) {
// Remove out listener from the listeners Set.
listeners.delete(listener);
}
}
export function attachTargetEventListener(listener: ReactDOMListener): void {
const {event, target} = listener;
const {capture, passive, priority, type} = event;
const eventTarget = ((target: any): EventTarget);
const listenerMap = getListenerMapForElement(eventTarget);
// Add the event listener to the TargetEvent object.
listenToTopLevelEvent(
type,
eventTarget,
listenerMap,
PLUGIN_EVENT_SYSTEM | USE_EVENT_SYSTEM | IS_TARGET_PHASE_ONLY,
passive,
priority,
capture,
);
let eventTypeMap = eventTargetEventListenerStore.get(eventTarget);
if (eventTypeMap === undefined) {
eventTypeMap = new Map();
eventTargetEventListenerStore.set(eventTarget, eventTypeMap);
}
// Get the listeners by the event type
let listeners = eventTypeMap.get(type);
if (listeners === undefined) {
listeners = {captured: new Set(), bubbled: new Set()};
eventTypeMap.set(type, listeners);
}
// Add our listener to the listeners Set.
if (capture) {
listeners.captured.add(listener);
} else {
listeners.bubbled.add(listener);
}
// Finally, add the event to our known event types list.
addEventTypeToDispatchConfig(type);
}
export function detachTargetEventListener(listener: ReactDOMListener): void {
const {event, target} = listener;
const {capture, type} = event;
const validEventTarget = ((target: any): EventTarget);
const eventTypeMap = eventTargetEventListenerStore.get(validEventTarget);
if (eventTypeMap !== undefined) {
const listeners = eventTypeMap.get(type);
if (listeners !== undefined) {
// Remove out listener from the listeners Set.
if (capture) {
listeners.captured.delete(listener);
} else {
listeners.bubbled.delete(listener);
}
}
}
}
export function attachListenerToReactScope(listener: ReactDOMListener): void {
const {event, target} = listener;
const {capture, type} = event;
const reactScope = ((target: any): ReactScopeMethods);
let eventTypeMap = reactScopeListenerStore.get(reactScope);
if (eventTypeMap === undefined) {
eventTypeMap = new Map();
reactScopeListenerStore.set(reactScope, eventTypeMap);
}
// Get the listeners by the event type
let listeners = eventTypeMap.get(type);
if (listeners === undefined) {
listeners = {captured: new Set(), bubbled: new Set()};
eventTypeMap.set(type, listeners);
}
// Add our listener to the listeners Set.
if (capture) {
listeners.captured.add(listener);
} else {
listeners.bubbled.add(listener);
}
// Finally, add the event to our known event types list.
addEventTypeToDispatchConfig(type);
}
export function detachListenerFromReactScope(listener: ReactDOMListener): void {
const {event, target} = listener;
const {capture, type} = event;
const reactScope = ((target: any): ReactScopeMethods);
const eventTypeMap = reactScopeListenerStore.get(reactScope);
if (eventTypeMap !== undefined) {
const listeners = eventTypeMap.get(type);
if (listeners !== undefined) {
// Remove out listener from the listeners Set.
if (capture) {
listeners.captured.delete(listener);
} else {
listeners.bubbled.delete(listener);
}
}
}
}