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ReactDOMEventListener.js
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ReactDOMEventListener.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 '../events/PluginModuleType';
import type {Fiber, FiberRoot} from 'react-reconciler/src/ReactInternalTypes';
import type {Container, SuspenseInstance} from '../client/ReactDOMHostConfig';
import type {DOMEventName} from '../events/DOMEventNames';
import {enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay} from 'shared/ReactFeatureFlags';
import {
isDiscreteEventThatRequiresHydration,
queueDiscreteEvent,
hasQueuedDiscreteEvents,
clearIfContinuousEvent,
queueIfContinuousEvent,
attemptSynchronousHydration,
} from './ReactDOMEventReplaying';
import {
getNearestMountedFiber,
getContainerFromFiber,
getSuspenseInstanceFromFiber,
} from 'react-reconciler/src/ReactFiberTreeReflection';
import {HostRoot, SuspenseComponent} from 'react-reconciler/src/ReactWorkTags';
import {type EventSystemFlags, IS_CAPTURE_PHASE} from './EventSystemFlags';
import getEventTarget from './getEventTarget';
import {
getInstanceFromNode,
getClosestInstanceFromNode,
} from '../client/ReactDOMComponentTree';
import {dispatchEventForPluginEventSystem} from './DOMPluginEventSystem';
import {
getCurrentPriorityLevel as getCurrentSchedulerPriorityLevel,
IdlePriority as IdleSchedulerPriority,
ImmediatePriority as ImmediateSchedulerPriority,
LowPriority as LowSchedulerPriority,
NormalPriority as NormalSchedulerPriority,
UserBlockingPriority as UserBlockingSchedulerPriority,
} from 'react-reconciler/src/Scheduler';
import {
DiscreteEventPriority,
ContinuousEventPriority,
DefaultEventPriority,
IdleEventPriority,
getCurrentUpdatePriority,
setCurrentUpdatePriority,
} from 'react-reconciler/src/ReactEventPriorities';
import ReactSharedInternals from 'shared/ReactSharedInternals';
import {isRootDehydrated} from 'react-reconciler/src/ReactFiberShellHydration';
const {ReactCurrentBatchConfig} = ReactSharedInternals;
// TODO: can we stop exporting these?
export let _enabled: boolean = true;
// This is exported in FB builds for use by legacy FB layer infra.
// We'd like to remove this but it's not clear if this is safe.
export function setEnabled(enabled: ?boolean): void {
_enabled = !!enabled;
}
export function isEnabled(): boolean {
return _enabled;
}
export function createEventListenerWrapper(
targetContainer: EventTarget,
domEventName: DOMEventName,
eventSystemFlags: EventSystemFlags,
): Function {
return dispatchEvent.bind(
null,
domEventName,
eventSystemFlags,
targetContainer,
);
}
export function createEventListenerWrapperWithPriority(
targetContainer: EventTarget,
domEventName: DOMEventName,
eventSystemFlags: EventSystemFlags,
): Function {
const eventPriority = getEventPriority(domEventName);
let listenerWrapper;
switch (eventPriority) {
case DiscreteEventPriority:
listenerWrapper = dispatchDiscreteEvent;
break;
case ContinuousEventPriority:
listenerWrapper = dispatchContinuousEvent;
break;
case DefaultEventPriority:
default:
listenerWrapper = dispatchEvent;
break;
}
return listenerWrapper.bind(
null,
domEventName,
eventSystemFlags,
targetContainer,
);
}
function dispatchDiscreteEvent(
domEventName,
eventSystemFlags,
container,
nativeEvent,
) {
const previousPriority = getCurrentUpdatePriority();
const prevTransition = ReactCurrentBatchConfig.transition;
ReactCurrentBatchConfig.transition = null;
try {
setCurrentUpdatePriority(DiscreteEventPriority);
dispatchEvent(domEventName, eventSystemFlags, container, nativeEvent);
} finally {
setCurrentUpdatePriority(previousPriority);
ReactCurrentBatchConfig.transition = prevTransition;
}
}
function dispatchContinuousEvent(
domEventName,
eventSystemFlags,
container,
nativeEvent,
) {
const previousPriority = getCurrentUpdatePriority();
const prevTransition = ReactCurrentBatchConfig.transition;
ReactCurrentBatchConfig.transition = null;
try {
setCurrentUpdatePriority(ContinuousEventPriority);
dispatchEvent(domEventName, eventSystemFlags, container, nativeEvent);
} finally {
setCurrentUpdatePriority(previousPriority);
ReactCurrentBatchConfig.transition = prevTransition;
}
}
export function dispatchEvent(
domEventName: DOMEventName,
eventSystemFlags: EventSystemFlags,
targetContainer: EventTarget,
nativeEvent: AnyNativeEvent,
): void {
if (!_enabled) {
return;
}
if (enableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay) {
dispatchEventWithEnableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay(
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
} else {
dispatchEventOriginal(
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
}
}
function dispatchEventOriginal(
domEventName: DOMEventName,
eventSystemFlags: EventSystemFlags,
targetContainer: EventTarget,
nativeEvent: AnyNativeEvent,
) {
// TODO: replaying capture phase events is currently broken
// because we used to do it during top-level native bubble handlers
// but now we use different bubble and capture handlers.
// In eager mode, we attach capture listeners early, so we need
// to filter them out until we fix the logic to handle them correctly.
const allowReplay = (eventSystemFlags & IS_CAPTURE_PHASE) === 0;
if (
allowReplay &&
hasQueuedDiscreteEvents() &&
isDiscreteEventThatRequiresHydration(domEventName)
) {
// If we already have a queue of discrete events, and this is another discrete
// event, then we can't dispatch it regardless of its target, since they
// need to dispatch in order.
queueDiscreteEvent(
null, // Flags that we're not actually blocked on anything as far as we know.
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
return;
}
const blockedOn = findInstanceBlockingEvent(
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
if (blockedOn === null) {
dispatchEventForPluginEventSystem(
domEventName,
eventSystemFlags,
nativeEvent,
return_targetInst,
targetContainer,
);
if (allowReplay) {
clearIfContinuousEvent(domEventName, nativeEvent);
}
return;
}
if (allowReplay) {
if (isDiscreteEventThatRequiresHydration(domEventName)) {
// This to be replayed later once the target is available.
queueDiscreteEvent(
blockedOn,
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
return;
}
if (
queueIfContinuousEvent(
blockedOn,
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
)
) {
return;
}
// We need to clear only if we didn't queue because
// queueing is accumulative.
clearIfContinuousEvent(domEventName, nativeEvent);
}
// This is not replayable so we'll invoke it but without a target,
// in case the event system needs to trace it.
dispatchEventForPluginEventSystem(
domEventName,
eventSystemFlags,
nativeEvent,
null,
targetContainer,
);
}
function dispatchEventWithEnableCapturePhaseSelectiveHydrationWithoutDiscreteEventReplay(
domEventName: DOMEventName,
eventSystemFlags: EventSystemFlags,
targetContainer: EventTarget,
nativeEvent: AnyNativeEvent,
) {
let blockedOn = findInstanceBlockingEvent(
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
if (blockedOn === null) {
dispatchEventForPluginEventSystem(
domEventName,
eventSystemFlags,
nativeEvent,
return_targetInst,
targetContainer,
);
clearIfContinuousEvent(domEventName, nativeEvent);
return;
}
if (
queueIfContinuousEvent(
blockedOn,
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
)
) {
nativeEvent.stopPropagation();
return;
}
// We need to clear only if we didn't queue because
// queueing is accumulative.
clearIfContinuousEvent(domEventName, nativeEvent);
if (
eventSystemFlags & IS_CAPTURE_PHASE &&
isDiscreteEventThatRequiresHydration(domEventName)
) {
while (blockedOn !== null) {
const fiber = getInstanceFromNode(blockedOn);
if (fiber !== null) {
attemptSynchronousHydration(fiber);
}
const nextBlockedOn = findInstanceBlockingEvent(
domEventName,
eventSystemFlags,
targetContainer,
nativeEvent,
);
if (nextBlockedOn === null) {
dispatchEventForPluginEventSystem(
domEventName,
eventSystemFlags,
nativeEvent,
return_targetInst,
targetContainer,
);
}
if (nextBlockedOn === blockedOn) {
break;
}
blockedOn = nextBlockedOn;
}
if (blockedOn !== null) {
nativeEvent.stopPropagation();
}
return;
}
// This is not replayable so we'll invoke it but without a target,
// in case the event system needs to trace it.
dispatchEventForPluginEventSystem(
domEventName,
eventSystemFlags,
nativeEvent,
null,
targetContainer,
);
}
export let return_targetInst: null | Fiber = null;
// Returns a SuspenseInstance or Container if it's blocked.
// The return_targetInst field above is conceptually part of the return value.
export function findInstanceBlockingEvent(
domEventName: DOMEventName,
eventSystemFlags: EventSystemFlags,
targetContainer: EventTarget,
nativeEvent: AnyNativeEvent,
): null | Container | SuspenseInstance {
// TODO: Warn if _enabled is false.
return_targetInst = null;
const nativeEventTarget = getEventTarget(nativeEvent);
let targetInst = getClosestInstanceFromNode(nativeEventTarget);
if (targetInst !== null) {
const nearestMounted = getNearestMountedFiber(targetInst);
if (nearestMounted === null) {
// This tree has been unmounted already. Dispatch without a target.
targetInst = null;
} else {
const tag = nearestMounted.tag;
if (tag === SuspenseComponent) {
const instance = getSuspenseInstanceFromFiber(nearestMounted);
if (instance !== null) {
// Queue the event to be replayed later. Abort dispatching since we
// don't want this event dispatched twice through the event system.
// TODO: If this is the first discrete event in the queue. Schedule an increased
// priority for this boundary.
return instance;
}
// This shouldn't happen, something went wrong but to avoid blocking
// the whole system, dispatch the event without a target.
// TODO: Warn.
targetInst = null;
} else if (tag === HostRoot) {
const root: FiberRoot = nearestMounted.stateNode;
if (isRootDehydrated(root)) {
// If this happens during a replay something went wrong and it might block
// the whole system.
return getContainerFromFiber(nearestMounted);
}
targetInst = null;
} else if (nearestMounted !== targetInst) {
// If we get an event (ex: img onload) before committing that
// component's mount, ignore it for now (that is, treat it as if it was an
// event on a non-React tree). We might also consider queueing events and
// dispatching them after the mount.
targetInst = null;
}
}
}
return_targetInst = targetInst;
// We're not blocked on anything.
return null;
}
export function getEventPriority(domEventName: DOMEventName): * {
switch (domEventName) {
// Used by SimpleEventPlugin:
case 'cancel':
case 'click':
case 'close':
case 'contextmenu':
case 'copy':
case 'cut':
case 'auxclick':
case 'dblclick':
case 'dragend':
case 'dragstart':
case 'drop':
case 'focusin':
case 'focusout':
case 'input':
case 'invalid':
case 'keydown':
case 'keypress':
case 'keyup':
case 'mousedown':
case 'mouseup':
case 'paste':
case 'pause':
case 'play':
case 'pointercancel':
case 'pointerdown':
case 'pointerup':
case 'ratechange':
case 'reset':
case 'resize':
case 'seeked':
case 'submit':
case 'touchcancel':
case 'touchend':
case 'touchstart':
case 'volumechange':
// Used by polyfills:
// eslint-disable-next-line no-fallthrough
case 'change':
case 'selectionchange':
case 'textInput':
case 'compositionstart':
case 'compositionend':
case 'compositionupdate':
// Only enableCreateEventHandleAPI:
// eslint-disable-next-line no-fallthrough
case 'beforeblur':
case 'afterblur':
// Not used by React but could be by user code:
// eslint-disable-next-line no-fallthrough
case 'beforeinput':
case 'blur':
case 'fullscreenchange':
case 'focus':
case 'hashchange':
case 'popstate':
case 'select':
case 'selectstart':
return DiscreteEventPriority;
case 'drag':
case 'dragenter':
case 'dragexit':
case 'dragleave':
case 'dragover':
case 'mousemove':
case 'mouseout':
case 'mouseover':
case 'pointermove':
case 'pointerout':
case 'pointerover':
case 'scroll':
case 'toggle':
case 'touchmove':
case 'wheel':
// Not used by React but could be by user code:
// eslint-disable-next-line no-fallthrough
case 'mouseenter':
case 'mouseleave':
case 'pointerenter':
case 'pointerleave':
return ContinuousEventPriority;
case 'message': {
// We might be in the Scheduler callback.
// Eventually this mechanism will be replaced by a check
// of the current priority on the native scheduler.
const schedulerPriority = getCurrentSchedulerPriorityLevel();
switch (schedulerPriority) {
case ImmediateSchedulerPriority:
return DiscreteEventPriority;
case UserBlockingSchedulerPriority:
return ContinuousEventPriority;
case NormalSchedulerPriority:
case LowSchedulerPriority:
// TODO: Handle LowSchedulerPriority, somehow. Maybe the same lane as hydration.
return DefaultEventPriority;
case IdleSchedulerPriority:
return IdleEventPriority;
default:
return DefaultEventPriority;
}
}
default:
return DefaultEventPriority;
}
}