97 lines
3.1 KiB
JavaScript
97 lines
3.1 KiB
JavaScript
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/**
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* Copyright 2013-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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'use strict';
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var EventPropagators = require('./EventPropagators');
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var ReactDOMComponentTree = require('./ReactDOMComponentTree');
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var SyntheticMouseEvent = require('./SyntheticMouseEvent');
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var eventTypes = {
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mouseEnter: {
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registrationName: 'onMouseEnter',
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dependencies: ['topMouseOut', 'topMouseOver']
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},
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mouseLeave: {
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registrationName: 'onMouseLeave',
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dependencies: ['topMouseOut', 'topMouseOver']
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}
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};
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var EnterLeaveEventPlugin = {
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eventTypes: eventTypes,
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/**
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* For almost every interaction we care about, there will be both a top-level
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* `mouseover` and `mouseout` event that occurs. Only use `mouseout` so that
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* we do not extract duplicate events. However, moving the mouse into the
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* browser from outside will not fire a `mouseout` event. In this case, we use
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* the `mouseover` top-level event.
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*/
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extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) {
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if (topLevelType === 'topMouseOver' && (nativeEvent.relatedTarget || nativeEvent.fromElement)) {
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return null;
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}
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if (topLevelType !== 'topMouseOut' && topLevelType !== 'topMouseOver') {
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// Must not be a mouse in or mouse out - ignoring.
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return null;
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}
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var win;
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if (nativeEventTarget.window === nativeEventTarget) {
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// `nativeEventTarget` is probably a window object.
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win = nativeEventTarget;
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} else {
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// TODO: Figure out why `ownerDocument` is sometimes undefined in IE8.
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var doc = nativeEventTarget.ownerDocument;
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if (doc) {
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win = doc.defaultView || doc.parentWindow;
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} else {
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win = window;
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}
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}
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var from;
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var to;
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if (topLevelType === 'topMouseOut') {
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from = targetInst;
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var related = nativeEvent.relatedTarget || nativeEvent.toElement;
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to = related ? ReactDOMComponentTree.getClosestInstanceFromNode(related) : null;
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} else {
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// Moving to a node from outside the window.
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from = null;
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to = targetInst;
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}
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if (from === to) {
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// Nothing pertains to our managed components.
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return null;
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}
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var fromNode = from == null ? win : ReactDOMComponentTree.getNodeFromInstance(from);
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var toNode = to == null ? win : ReactDOMComponentTree.getNodeFromInstance(to);
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var leave = SyntheticMouseEvent.getPooled(eventTypes.mouseLeave, from, nativeEvent, nativeEventTarget);
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leave.type = 'mouseleave';
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leave.target = fromNode;
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leave.relatedTarget = toNode;
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var enter = SyntheticMouseEvent.getPooled(eventTypes.mouseEnter, to, nativeEvent, nativeEventTarget);
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enter.type = 'mouseenter';
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enter.target = toNode;
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enter.relatedTarget = fromNode;
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EventPropagators.accumulateEnterLeaveDispatches(leave, enter, from, to);
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return [leave, enter];
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}
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};
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module.exports = EnterLeaveEventPlugin;
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