mirror of
https://github.com/facebook/react.git
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92 lines
2.7 KiB
JavaScript
92 lines
2.7 KiB
JavaScript
/**
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* Copyright 2013 Facebook, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* @providesModule ReactEventTopLevelCallback
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* @typechecks static-only
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*/
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"use strict";
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var ExecutionEnvironment = require('ExecutionEnvironment');
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var ReactEventEmitter = require('ReactEventEmitter');
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var ReactID = require('ReactID');
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var ReactInstanceHandles = require('ReactInstanceHandles');
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var getEventTarget = require('getEventTarget');
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/**
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* @type {boolean}
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* @private
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*/
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var _topLevelListenersEnabled = true;
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/**
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* Top-level callback creator used to implement event handling using delegation.
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* This is used via dependency injection in `ReactEventEmitter.ensureListening`.
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*/
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var ReactEventTopLevelCallback = {
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/**
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* Sets whether or not any created callbacks should be enabled.
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*
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* @param {boolean} enabled True if callbacks should be enabled.
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*/
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setEnabled: function(enabled) {
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_topLevelListenersEnabled = !!enabled;
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},
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/**
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* @return {boolean} True if callbacks are enabled.
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*/
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isEnabled: function() {
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return _topLevelListenersEnabled;
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},
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/**
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* Creates a callback for the supplied `topLevelType` that could be added as
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* a listener to the document. The callback computes a `topLevelTarget` which
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* should be the root node of a mounted React component where the listener
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* is attached.
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*
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* @param {string} topLevelType Record from `EventConstants`.
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* @return {function} Callback for handling top-level events.
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*/
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createTopLevelCallback: function(topLevelType) {
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return function(nativeEvent) {
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if (!_topLevelListenersEnabled) {
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return;
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}
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// TODO: Remove when synthetic events are ready, this is for IE<9.
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if (nativeEvent.srcElement &&
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nativeEvent.srcElement !== nativeEvent.target) {
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nativeEvent.target = nativeEvent.srcElement;
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}
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var topLevelTarget = ReactInstanceHandles.getFirstReactDOM(
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getEventTarget(nativeEvent)
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) || ExecutionEnvironment.global;
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var topLevelTargetID = ReactID.getID(topLevelTarget) || '';
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ReactEventEmitter.handleTopLevel(
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topLevelType,
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topLevelTarget,
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topLevelTargetID,
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nativeEvent
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);
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};
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}
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};
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module.exports = ReactEventTopLevelCallback;
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