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/**
* 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 EventPropagators = require('./EventPropagators');
var ReactDOMComponentTree = require('./ReactDOMComponentTree');
var SyntheticMouseEvent = require('./SyntheticMouseEvent');
var eventTypes = {
mouseEnter: {
registrationName: 'onMouseEnter',
dependencies: ['topMouseOut', 'topMouseOver']
},
mouseLeave: {
registrationName: 'onMouseLeave',
dependencies: ['topMouseOut', 'topMouseOver']
}
};
var EnterLeaveEventPlugin = {
eventTypes: eventTypes,
/**
* For almost every interaction we care about, there will be both a top-level
* `mouseover` and `mouseout` event that occurs. Only use `mouseout` so that
* we do not extract duplicate events. However, moving the mouse into the
* browser from outside will not fire a `mouseout` event. In this case, we use
* the `mouseover` top-level event.
*/
extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) {
if (topLevelType === 'topMouseOver' && (nativeEvent.relatedTarget || nativeEvent.fromElement)) {
return null;
}
if (topLevelType !== 'topMouseOut' && topLevelType !== 'topMouseOver') {
// Must not be a mouse in or mouse out - ignoring.
return null;
}
var win;
if (nativeEventTarget.window === nativeEventTarget) {
// `nativeEventTarget` is probably a window object.
win = nativeEventTarget;
} else {
// TODO: Figure out why `ownerDocument` is sometimes undefined in IE8.
var doc = nativeEventTarget.ownerDocument;
if (doc) {
win = doc.defaultView || doc.parentWindow;
} else {
win = window;
}
}
var from;
var to;
if (topLevelType === 'topMouseOut') {
from = targetInst;
var related = nativeEvent.relatedTarget || nativeEvent.toElement;
to = related ? ReactDOMComponentTree.getClosestInstanceFromNode(related) : null;
} else {
// Moving to a node from outside the window.
from = null;
to = targetInst;
}
if (from === to) {
// Nothing pertains to our managed components.
return null;
}
var fromNode = from == null ? win : ReactDOMComponentTree.getNodeFromInstance(from);
var toNode = to == null ? win : ReactDOMComponentTree.getNodeFromInstance(to);
var leave = SyntheticMouseEvent.getPooled(eventTypes.mouseLeave, from, nativeEvent, nativeEventTarget);
leave.type = 'mouseleave';
leave.target = fromNode;
leave.relatedTarget = toNode;
var enter = SyntheticMouseEvent.getPooled(eventTypes.mouseEnter, to, nativeEvent, nativeEventTarget);
enter.type = 'mouseenter';
enter.target = toNode;
enter.relatedTarget = fromNode;
EventPropagators.accumulateEnterLeaveDispatches(leave, enter, from, to);
return [leave, enter];
}
};
module.exports = EnterLeaveEventPlugin;
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