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75 lines
2.6 KiB
JavaScript
75 lines
2.6 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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*/
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"use strict";
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var ExecutionEnvironment = require("./ExecutionEnvironment");
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var ReactEvent = require("./ReactEvent");
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var ReactInstanceHandles = require("./ReactInstanceHandles");
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var getDOMNodeID = require("./getDOMNodeID");
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var _topLevelListenersEnabled = true;
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var ReactEventTopLevelCallback = {
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/**
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* @param {boolean} enabled Whether or not all callbacks that have ever been
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* created with this module 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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isEnabled: function() {
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return _topLevelListenersEnabled;
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},
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/**
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* For a given `topLevelType`, creates a callback that could be added as a
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* listener to the document. That top level callback will simply fix the
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* native events before invoking `handleTopLevel`.
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*
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* - Raw native events cannot be trusted to describe their targets correctly
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* so we expect that the argument to the nested function has already been
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* fixed. But the `target` property may not be something of interest to
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* React, so we find the most suitable target. But even at that point, DOM
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* Elements (the target ) can't be trusted to describe their IDs correctly
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* so we obtain the ID in a reliable manner and pass it to
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* `handleTopLevel`. The target/id that we found to be relevant to our
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* framework are called `renderedTarget`/`renderedTargetID` respectively.
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*/
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createTopLevelCallback: function(topLevelType) {
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return function(fixedNativeEvent) {
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if (!_topLevelListenersEnabled) {
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return;
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}
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var renderedTarget = ReactInstanceHandles.getFirstReactDOM(
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fixedNativeEvent.target
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) || ExecutionEnvironment.global;
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var renderedTargetID = getDOMNodeID(renderedTarget);
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var event = fixedNativeEvent;
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var target = renderedTarget;
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ReactEvent.handleTopLevel(topLevelType, event, renderedTargetID, target);
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};
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}
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};
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module.exports = ReactEventTopLevelCallback;
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