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Diffstat (limited to 'node_modules/react-dom/lib/EventPluginHub.js')
| -rw-r--r-- | node_modules/react-dom/lib/EventPluginHub.js | 277 |
1 files changed, 277 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/EventPluginHub.js b/node_modules/react-dom/lib/EventPluginHub.js new file mode 100644 index 000000000..ee95b1256 --- /dev/null +++ b/node_modules/react-dom/lib/EventPluginHub.js @@ -0,0 +1,277 @@ +/** + * Copyright 2013-present, Facebook, Inc. + * All rights reserved. + * + * This source code is licensed under the BSD-style license found in the + * LICENSE file in the root directory of this source tree. An additional grant + * of patent rights can be found in the PATENTS file in the same directory. + * + */ + +'use strict'; + +var _prodInvariant = require('./reactProdInvariant'); + +var EventPluginRegistry = require('./EventPluginRegistry'); +var EventPluginUtils = require('./EventPluginUtils'); +var ReactErrorUtils = require('./ReactErrorUtils'); + +var accumulateInto = require('./accumulateInto'); +var forEachAccumulated = require('./forEachAccumulated'); +var invariant = require('fbjs/lib/invariant'); + +/** + * Internal store for event listeners + */ +var listenerBank = {}; + +/** + * Internal queue of events that have accumulated their dispatches and are + * waiting to have their dispatches executed. + */ +var eventQueue = null; + +/** + * Dispatches an event and releases it back into the pool, unless persistent. + * + * @param {?object} event Synthetic event to be dispatched. + * @param {boolean} simulated If the event is simulated (changes exn behavior) + * @private + */ +var executeDispatchesAndRelease = function (event, simulated) { + if (event) { + EventPluginUtils.executeDispatchesInOrder(event, simulated); + + if (!event.isPersistent()) { + event.constructor.release(event); + } + } +}; +var executeDispatchesAndReleaseSimulated = function (e) { + return executeDispatchesAndRelease(e, true); +}; +var executeDispatchesAndReleaseTopLevel = function (e) { + return executeDispatchesAndRelease(e, false); +}; + +var getDictionaryKey = function (inst) { + // Prevents V8 performance issue: + // https://github.com/facebook/react/pull/7232 + return '.' + inst._rootNodeID; +}; + +function isInteractive(tag) { + return tag === 'button' || tag === 'input' || tag === 'select' || tag === 'textarea'; +} + +function shouldPreventMouseEvent(name, type, props) { + switch (name) { + case 'onClick': + case 'onClickCapture': + case 'onDoubleClick': + case 'onDoubleClickCapture': + case 'onMouseDown': + case 'onMouseDownCapture': + case 'onMouseMove': + case 'onMouseMoveCapture': + case 'onMouseUp': + case 'onMouseUpCapture': + return !!(props.disabled && isInteractive(type)); + default: + return false; + } +} + +/** + * This is a unified interface for event plugins to be installed and configured. + * + * Event plugins can implement the following properties: + * + * `extractEvents` {function(string, DOMEventTarget, string, object): *} + * Required. When a top-level event is fired, this method is expected to + * extract synthetic events that will in turn be queued and dispatched. + * + * `eventTypes` {object} + * Optional, plugins that fire events must publish a mapping of registration + * names that are used to register listeners. Values of this mapping must + * be objects that contain `registrationName` or `phasedRegistrationNames`. + * + * `executeDispatch` {function(object, function, string)} + * Optional, allows plugins to override how an event gets dispatched. By + * default, the listener is simply invoked. + * + * Each plugin that is injected into `EventsPluginHub` is immediately operable. + * + * @public + */ +var EventPluginHub = { + + /** + * Methods for injecting dependencies. + */ + injection: { + + /** + * @param {array} InjectedEventPluginOrder + * @public + */ + injectEventPluginOrder: EventPluginRegistry.injectEventPluginOrder, + + /** + * @param {object} injectedNamesToPlugins Map from names to plugin modules. + */ + injectEventPluginsByName: EventPluginRegistry.injectEventPluginsByName + + }, + + /** + * Stores `listener` at `listenerBank[registrationName][key]`. Is idempotent. + * + * @param {object} inst The instance, which is the source of events. + * @param {string} registrationName Name of listener (e.g. `onClick`). + * @param {function} listener The callback to store. + */ + putListener: function (inst, registrationName, listener) { + !(typeof listener === 'function') ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Expected %s listener to be a function, instead got type %s', registrationName, typeof listener) : _prodInvariant('94', registrationName, typeof listener) : void 0; + + var key = getDictionaryKey(inst); + var bankForRegistrationName = listenerBank[registrationName] || (listenerBank[registrationName] = {}); + bankForRegistrationName[key] = listener; + + var PluginModule = EventPluginRegistry.registrationNameModules[registrationName]; + if (PluginModule && PluginModule.didPutListener) { + PluginModule.didPutListener(inst, registrationName, listener); + } + }, + + /** + * @param {object} inst The instance, which is the source of events. + * @param {string} registrationName Name of listener (e.g. `onClick`). + * @return {?function} The stored callback. + */ + getListener: function (inst, registrationName) { + // TODO: shouldPreventMouseEvent is DOM-specific and definitely should not + // live here; needs to be moved to a better place soon + var bankForRegistrationName = listenerBank[registrationName]; + if (shouldPreventMouseEvent(registrationName, inst._currentElement.type, inst._currentElement.props)) { + return null; + } + var key = getDictionaryKey(inst); + return bankForRegistrationName && bankForRegistrationName[key]; + }, + + /** + * Deletes a listener from the registration bank. + * + * @param {object} inst The instance, which is the source of events. + * @param {string} registrationName Name of listener (e.g. `onClick`). + */ + deleteListener: function (inst, registrationName) { + var PluginModule = EventPluginRegistry.registrationNameModules[registrationName]; + if (PluginModule && PluginModule.willDeleteListener) { + PluginModule.willDeleteListener(inst, registrationName); + } + + var bankForRegistrationName = listenerBank[registrationName]; + // TODO: This should never be null -- when is it? + if (bankForRegistrationName) { + var key = getDictionaryKey(inst); + delete bankForRegistrationName[key]; + } + }, + + /** + * Deletes all listeners for the DOM element with the supplied ID. + * + * @param {object} inst The instance, which is the source of events. + */ + deleteAllListeners: function (inst) { + var key = getDictionaryKey(inst); + for (var registrationName in listenerBank) { + if (!listenerBank.hasOwnProperty(registrationName)) { + continue; + } + + if (!listenerBank[registrationName][key]) { + continue; + } + + var PluginModule = EventPluginRegistry.registrationNameModules[registrationName]; + if (PluginModule && PluginModule.willDeleteListener) { + PluginModule.willDeleteListener(inst, registrationName); + } + + delete listenerBank[registrationName][key]; + } + }, + + /** + * Allows registered plugins an opportunity to extract events from top-level + * native browser events. + * + * @return {*} An accumulation of synthetic events. + * @internal + */ + extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) { + var events; + var plugins = EventPluginRegistry.plugins; + for (var i = 0; i < plugins.length; i++) { + // Not every plugin in the ordering may be loaded at runtime. + var possiblePlugin = plugins[i]; + if (possiblePlugin) { + var extractedEvents = possiblePlugin.extractEvents(topLevelType, targetInst, nativeEvent, nativeEventTarget); + if (extractedEvents) { + events = accumulateInto(events, extractedEvents); + } + } + } + return events; + }, + + /** + * Enqueues a synthetic event that should be dispatched when + * `processEventQueue` is invoked. + * + * @param {*} events An accumulation of synthetic events. + * @internal + */ + enqueueEvents: function (events) { + if (events) { + eventQueue = accumulateInto(eventQueue, events); + } + }, + + /** + * Dispatches all synthetic events on the event queue. + * + * @internal + */ + processEventQueue: function (simulated) { + // Set `eventQueue` to null before processing it so that we can tell if more + // events get enqueued while processing. + var processingEventQueue = eventQueue; + eventQueue = null; + if (simulated) { + forEachAccumulated(processingEventQueue, executeDispatchesAndReleaseSimulated); + } else { + forEachAccumulated(processingEventQueue, executeDispatchesAndReleaseTopLevel); + } + !!eventQueue ? process.env.NODE_ENV !== 'production' ? invariant(false, 'processEventQueue(): Additional events were enqueued while processing an event queue. Support for this has not yet been implemented.') : _prodInvariant('95') : void 0; + // This would be a good time to rethrow if any of the event handlers threw. + ReactErrorUtils.rethrowCaughtError(); + }, + + /** + * These are needed for tests only. Do not use! + */ + __purge: function () { + listenerBank = {}; + }, + + __getListenerBank: function () { + return listenerBank; + } + +}; + +module.exports = EventPluginHub;
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