/
ReactDOMEventHandle.js
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/
ReactDOMEventHandle.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 {DOMTopLevelEventType} from '../events/TopLevelEventTypes';
import type {EventPriority, ReactScopeInstance} from 'shared/ReactTypes';
import type {
ReactDOMEventHandle,
ReactDOMEventHandleListener,
} from '../shared/ReactDOMTypes';
import {getEventPriorityForListenerSystem} from '../events/DOMEventProperties';
import {
getClosestInstanceFromNode,
getEventHandlerListeners,
setEventHandlerListeners,
getEventListenerMap,
getFiberFromScopeInstance,
} from './ReactDOMComponentTree';
import {ELEMENT_NODE} from '../shared/HTMLNodeType';
import {
listenToTopLevelEvent,
addEventTypeToDispatchConfig,
} from '../events/DOMModernPluginEventSystem';
import {HostRoot, HostPortal} from 'react-reconciler/src/ReactWorkTags';
import {
PLUGIN_EVENT_SYSTEM,
IS_TARGET_PHASE_ONLY,
} from '../events/EventSystemFlags';
import {
enableScopeAPI,
enableCreateEventHandleAPI,
} from 'shared/ReactFeatureFlags';
import invariant from 'shared/invariant';
type EventHandleOptions = {|
capture?: boolean,
passive?: boolean,
priority?: EventPriority,
|};
function getNearestRootOrPortalContainer(node: Fiber): null | Element {
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 null;
}
function isValidEventTarget(target: EventTarget | ReactScopeInstance): boolean {
return typeof (target: Object).addEventListener === 'function';
}
function isReactScope(target: EventTarget | ReactScopeInstance): boolean {
return typeof (target: Object).getChildContextValues === 'function';
}
function createEventHandleListener(
type: DOMTopLevelEventType,
capture: boolean,
callback: (SyntheticEvent<EventTarget>) => void,
destroy: (target: EventTarget | ReactScopeInstance) => void,
): ReactDOMEventHandleListener {
return {
callback,
capture,
destroy,
type,
};
}
function registerEventOnNearestTargetContainer(
targetFiber: Fiber,
topLevelType: DOMTopLevelEventType,
passive: boolean | void,
priority: EventPriority | void,
capture: boolean,
): void {
// If it is, find the nearest root or portal and make it
// our event handle target container.
const targetContainer = getNearestRootOrPortalContainer(targetFiber);
if (targetContainer === null) {
invariant(
false,
'ReactDOM.createEventHandle: setListener called on an target ' +
'that did not have a corresponding root. This is likely a bug in React.',
);
}
const listenerMap = getEventListenerMap(targetContainer);
listenToTopLevelEvent(
topLevelType,
targetContainer,
listenerMap,
PLUGIN_EVENT_SYSTEM,
capture,
passive,
priority,
);
}
export function createEventHandle(
type: string,
options?: EventHandleOptions,
): ReactDOMEventHandle {
if (enableCreateEventHandleAPI) {
const topLevelType = ((type: any): DOMTopLevelEventType);
let capture = false;
let passive = undefined; // Undefined means to use the browser default
let priority;
if (options != null) {
const optionsCapture = options.capture;
const optionsPassive = options.passive;
const optionsPriority = options.priority;
if (typeof optionsCapture === 'boolean') {
capture = optionsCapture;
}
if (typeof optionsPassive === 'boolean') {
passive = optionsPassive;
}
if (typeof optionsPriority === 'number') {
priority = optionsPriority;
}
}
if (priority === undefined) {
priority = getEventPriorityForListenerSystem(topLevelType);
}
const listeners = new Map();
const destroy = (target: EventTarget | ReactScopeInstance): void => {
const listener = listeners.get(target);
if (listener !== undefined) {
listeners.delete(target);
const targetListeners = getEventHandlerListeners(target);
if (targetListeners !== null) {
targetListeners.delete(listener);
}
}
};
const clear = (): void => {
const eventTargetsArr = Array.from(listeners.keys());
for (let i = 0; i < eventTargetsArr.length; i++) {
destroy(eventTargetsArr[i]);
}
};
return {
setListener(
target: EventTarget | ReactScopeInstance,
callback: null | ((SyntheticEvent<EventTarget>) => void),
): void {
// Check if the target is a DOM element.
if ((target: any).nodeType === ELEMENT_NODE) {
const targetElement = ((target: any): Element);
// Check if the DOM element is managed by React.
const targetFiber = getClosestInstanceFromNode(targetElement);
if (targetFiber === null) {
invariant(
false,
'ReactDOM.createEventHandle: setListener called on an element ' +
'target that is not managed by React. Ensure React rendered the DOM element.',
);
}
registerEventOnNearestTargetContainer(
targetFiber,
topLevelType,
passive,
priority,
capture,
);
} else if (enableScopeAPI && isReactScope(target)) {
const scopeTarget = ((target: any): ReactScopeInstance);
const targetFiber = getFiberFromScopeInstance(scopeTarget);
if (targetFiber === null) {
// Scope is unmounted, do not proceed.
return;
}
registerEventOnNearestTargetContainer(
targetFiber,
topLevelType,
passive,
priority,
capture,
);
} else if (isValidEventTarget(target)) {
const eventTarget = ((target: any): EventTarget);
const listenerMap = getEventListenerMap(eventTarget);
listenToTopLevelEvent(
topLevelType,
eventTarget,
listenerMap,
PLUGIN_EVENT_SYSTEM | IS_TARGET_PHASE_ONLY,
capture,
passive,
priority,
);
} else {
invariant(
false,
'ReactDOM.createEventHandle: setListener called on an invalid ' +
'target. Provide a valid EventTarget or an element managed by React.',
);
}
let listener = listeners.get(target);
if (listener === undefined) {
if (callback === null) {
return;
}
listener = createEventHandleListener(
topLevelType,
capture,
callback,
destroy,
);
listeners.set(target, listener);
let targetListeners = getEventHandlerListeners(target);
if (targetListeners === null) {
targetListeners = new Set();
setEventHandlerListeners(target, targetListeners);
}
targetListeners.add(listener);
// Finally, add the event to our known event types list.
addEventTypeToDispatchConfig(topLevelType);
} else if (callback !== null) {
listener.callback = callback;
} else {
// Remove listener
destroy(target);
}
},
clear,
};
}
return (null: any);
}