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https://github.com/facebook/react.git
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103 lines
3.2 KiB
JavaScript
103 lines
3.2 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 EnterLeaveEventPlugin
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*/
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"use strict";
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var EventPropagators = require("./EventPropagators");
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var ExecutionEnvironment = require("./ExecutionEnvironment");
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var AbstractEvent = require("./AbstractEvent");
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var EventConstants = require("./EventConstants");
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var ReactInstanceHandles = require("./ReactInstanceHandles");
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var getDOMNodeID = require("./getDOMNodeID");
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var keyOf = require("./keyOf");
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var topLevelTypes = EventConstants.topLevelTypes;
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var getFirstReactDOM = ReactInstanceHandles.getFirstReactDOM;
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var abstractEventTypes = {
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mouseEnter: {registrationName: keyOf({onMouseEnter: null})},
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mouseLeave: {registrationName: keyOf({onMouseLeave: null})}
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};
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/**
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* For almost every interaction we care about, there will be a top level
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* `mouseOver` and `mouseOut` event that occur so we can usually only pay
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* attention to one of the two (we'll pay attention to the `mouseOut` event) to
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* avoid extracting a duplicate event. However, there's one interaction where
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* there will be no `mouseOut` event to rely on - mousing from outside the
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* browser *into* the chrome. We detect this scenario and only in that case, we
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* use the `mouseOver` event.
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*
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* @see EventPluginHub.extractAbstractEvents
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*/
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var extractAbstractEvents = function(
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topLevelType,
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nativeEvent,
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renderedTargetID,
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renderedTarget) {
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if (topLevelType === topLevelTypes.topMouseOver &&
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(nativeEvent.relatedTarget || nativeEvent.fromElement)) {
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return;
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}
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if (topLevelType !== topLevelTypes.topMouseOut &&
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topLevelType !== topLevelTypes.topMouseOver){
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return null; // Must not be a mouse in or mouse out - ignoring.
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}
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var to, from;
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if (topLevelType === topLevelTypes.topMouseOut) {
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to = getFirstReactDOM(nativeEvent.relatedTarget || nativeEvent.toElement) ||
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ExecutionEnvironment.global;
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from = renderedTarget;
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} else {
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to = renderedTarget;
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from = ExecutionEnvironment.global;
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}
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// Nothing pertains to our managed components.
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if (from === to ) {
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return;
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}
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var fromID = from ? getDOMNodeID(from) : '';
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var toID = to ? getDOMNodeID(to) : '';
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var leave = AbstractEvent.getPooled(
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abstractEventTypes.mouseLeave,
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fromID,
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topLevelType,
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nativeEvent
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);
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var enter = AbstractEvent.getPooled(
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abstractEventTypes.mouseEnter,
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toID,
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topLevelType,
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nativeEvent
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);
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EventPropagators.accumulateEnterLeaveDispatches(leave, enter, fromID, toID);
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return [leave, enter];
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};
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var EnterLeaveEventPlugin = {
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abstractEventTypes: abstractEventTypes,
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extractAbstractEvents: extractAbstractEvents
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};
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module.exports = EnterLeaveEventPlugin;
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