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author | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
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committer | Florian Dold <florian.dold@gmail.com> | 2017-05-03 15:35:00 +0200 |
commit | de98e0b232509d5f40c135d540a70e415272ff85 (patch) | |
tree | a79222a5b58484ab3b80d18efcaaa7ccc4769b33 /node_modules/react-dom/lib/SyntheticEvent.js | |
parent | e0c9d480a73fa629c1e4a47d3e721f1d2d345406 (diff) | |
download | wallet-core-de98e0b232509d5f40c135d540a70e415272ff85.tar.xz |
node_modules
Diffstat (limited to 'node_modules/react-dom/lib/SyntheticEvent.js')
-rw-r--r-- | node_modules/react-dom/lib/SyntheticEvent.js | 267 |
1 files changed, 267 insertions, 0 deletions
diff --git a/node_modules/react-dom/lib/SyntheticEvent.js b/node_modules/react-dom/lib/SyntheticEvent.js new file mode 100644 index 000000000..6b745cccc --- /dev/null +++ b/node_modules/react-dom/lib/SyntheticEvent.js @@ -0,0 +1,267 @@ +/** + * 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 _assign = require('object-assign'); + +var PooledClass = require('./PooledClass'); + +var emptyFunction = require('fbjs/lib/emptyFunction'); +var warning = require('fbjs/lib/warning'); + +var didWarnForAddedNewProperty = false; +var isProxySupported = typeof Proxy === 'function'; + +var shouldBeReleasedProperties = ['dispatchConfig', '_targetInst', 'nativeEvent', 'isDefaultPrevented', 'isPropagationStopped', '_dispatchListeners', '_dispatchInstances']; + +/** + * @interface Event + * @see http://www.w3.org/TR/DOM-Level-3-Events/ + */ +var EventInterface = { + type: null, + target: null, + // currentTarget is set when dispatching; no use in copying it here + currentTarget: emptyFunction.thatReturnsNull, + eventPhase: null, + bubbles: null, + cancelable: null, + timeStamp: function (event) { + return event.timeStamp || Date.now(); + }, + defaultPrevented: null, + isTrusted: null +}; + +/** + * Synthetic events are dispatched by event plugins, typically in response to a + * top-level event delegation handler. + * + * These systems should generally use pooling to reduce the frequency of garbage + * collection. The system should check `isPersistent` to determine whether the + * event should be released into the pool after being dispatched. Users that + * need a persisted event should invoke `persist`. + * + * Synthetic events (and subclasses) implement the DOM Level 3 Events API by + * normalizing browser quirks. Subclasses do not necessarily have to implement a + * DOM interface; custom application-specific events can also subclass this. + * + * @param {object} dispatchConfig Configuration used to dispatch this event. + * @param {*} targetInst Marker identifying the event target. + * @param {object} nativeEvent Native browser event. + * @param {DOMEventTarget} nativeEventTarget Target node. + */ +function SyntheticEvent(dispatchConfig, targetInst, nativeEvent, nativeEventTarget) { + if (process.env.NODE_ENV !== 'production') { + // these have a getter/setter for warnings + delete this.nativeEvent; + delete this.preventDefault; + delete this.stopPropagation; + } + + this.dispatchConfig = dispatchConfig; + this._targetInst = targetInst; + this.nativeEvent = nativeEvent; + + var Interface = this.constructor.Interface; + for (var propName in Interface) { + if (!Interface.hasOwnProperty(propName)) { + continue; + } + if (process.env.NODE_ENV !== 'production') { + delete this[propName]; // this has a getter/setter for warnings + } + var normalize = Interface[propName]; + if (normalize) { + this[propName] = normalize(nativeEvent); + } else { + if (propName === 'target') { + this.target = nativeEventTarget; + } else { + this[propName] = nativeEvent[propName]; + } + } + } + + var defaultPrevented = nativeEvent.defaultPrevented != null ? nativeEvent.defaultPrevented : nativeEvent.returnValue === false; + if (defaultPrevented) { + this.isDefaultPrevented = emptyFunction.thatReturnsTrue; + } else { + this.isDefaultPrevented = emptyFunction.thatReturnsFalse; + } + this.isPropagationStopped = emptyFunction.thatReturnsFalse; + return this; +} + +_assign(SyntheticEvent.prototype, { + + preventDefault: function () { + this.defaultPrevented = true; + var event = this.nativeEvent; + if (!event) { + return; + } + + if (event.preventDefault) { + event.preventDefault(); + } else if (typeof event.returnValue !== 'unknown') { + // eslint-disable-line valid-typeof + event.returnValue = false; + } + this.isDefaultPrevented = emptyFunction.thatReturnsTrue; + }, + + stopPropagation: function () { + var event = this.nativeEvent; + if (!event) { + return; + } + + if (event.stopPropagation) { + event.stopPropagation(); + } else if (typeof event.cancelBubble !== 'unknown') { + // eslint-disable-line valid-typeof + // The ChangeEventPlugin registers a "propertychange" event for + // IE. This event does not support bubbling or cancelling, and + // any references to cancelBubble throw "Member not found". A + // typeof check of "unknown" circumvents this issue (and is also + // IE specific). + event.cancelBubble = true; + } + + this.isPropagationStopped = emptyFunction.thatReturnsTrue; + }, + + /** + * We release all dispatched `SyntheticEvent`s after each event loop, adding + * them back into the pool. This allows a way to hold onto a reference that + * won't be added back into the pool. + */ + persist: function () { + this.isPersistent = emptyFunction.thatReturnsTrue; + }, + + /** + * Checks if this event should be released back into the pool. + * + * @return {boolean} True if this should not be released, false otherwise. + */ + isPersistent: emptyFunction.thatReturnsFalse, + + /** + * `PooledClass` looks for `destructor` on each instance it releases. + */ + destructor: function () { + var Interface = this.constructor.Interface; + for (var propName in Interface) { + if (process.env.NODE_ENV !== 'production') { + Object.defineProperty(this, propName, getPooledWarningPropertyDefinition(propName, Interface[propName])); + } else { + this[propName] = null; + } + } + for (var i = 0; i < shouldBeReleasedProperties.length; i++) { + this[shouldBeReleasedProperties[i]] = null; + } + if (process.env.NODE_ENV !== 'production') { + Object.defineProperty(this, 'nativeEvent', getPooledWarningPropertyDefinition('nativeEvent', null)); + Object.defineProperty(this, 'preventDefault', getPooledWarningPropertyDefinition('preventDefault', emptyFunction)); + Object.defineProperty(this, 'stopPropagation', getPooledWarningPropertyDefinition('stopPropagation', emptyFunction)); + } + } + +}); + +SyntheticEvent.Interface = EventInterface; + +if (process.env.NODE_ENV !== 'production') { + if (isProxySupported) { + /*eslint-disable no-func-assign */ + SyntheticEvent = new Proxy(SyntheticEvent, { + construct: function (target, args) { + return this.apply(target, Object.create(target.prototype), args); + }, + apply: function (constructor, that, args) { + return new Proxy(constructor.apply(that, args), { + set: function (target, prop, value) { + if (prop !== 'isPersistent' && !target.constructor.Interface.hasOwnProperty(prop) && shouldBeReleasedProperties.indexOf(prop) === -1) { + process.env.NODE_ENV !== 'production' ? warning(didWarnForAddedNewProperty || target.isPersistent(), 'This synthetic event is reused for performance reasons. If you\'re ' + 'seeing this, you\'re adding a new property in the synthetic event object. ' + 'The property is never released. See ' + 'https://fb.me/react-event-pooling for more information.') : void 0; + didWarnForAddedNewProperty = true; + } + target[prop] = value; + return true; + } + }); + } + }); + /*eslint-enable no-func-assign */ + } +} +/** + * Helper to reduce boilerplate when creating subclasses. + * + * @param {function} Class + * @param {?object} Interface + */ +SyntheticEvent.augmentClass = function (Class, Interface) { + var Super = this; + + var E = function () {}; + E.prototype = Super.prototype; + var prototype = new E(); + + _assign(prototype, Class.prototype); + Class.prototype = prototype; + Class.prototype.constructor = Class; + + Class.Interface = _assign({}, Super.Interface, Interface); + Class.augmentClass = Super.augmentClass; + + PooledClass.addPoolingTo(Class, PooledClass.fourArgumentPooler); +}; + +PooledClass.addPoolingTo(SyntheticEvent, PooledClass.fourArgumentPooler); + +module.exports = SyntheticEvent; + +/** + * Helper to nullify syntheticEvent instance properties when destructing + * + * @param {object} SyntheticEvent + * @param {String} propName + * @return {object} defineProperty object + */ +function getPooledWarningPropertyDefinition(propName, getVal) { + var isFunction = typeof getVal === 'function'; + return { + configurable: true, + set: set, + get: get + }; + + function set(val) { + var action = isFunction ? 'setting the method' : 'setting the property'; + warn(action, 'This is effectively a no-op'); + return val; + } + + function get() { + var action = isFunction ? 'accessing the method' : 'accessing the property'; + var result = isFunction ? 'This is a no-op function' : 'This is set to null'; + warn(action, result); + return getVal; + } + + function warn(action, result) { + var warningCondition = false; + process.env.NODE_ENV !== 'production' ? warning(warningCondition, 'This synthetic event is reused for performance reasons. If you\'re seeing this, ' + 'you\'re %s `%s` on a released/nullified synthetic event. %s. ' + 'If you must keep the original synthetic event around, use event.persist(). ' + 'See https://fb.me/react-event-pooling for more information.', action, propName, result) : void 0; + } +}
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