forked from facebook/react
/
EnterLeaveEventPlugin.js
174 lines (155 loc) · 5.02 KB
/
EnterLeaveEventPlugin.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
/**
* Copyright (c) Facebook, Inc. and its affiliates.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import {accumulateEnterLeaveDispatches} from 'legacy-events/EventPropagators';
import {
TOP_MOUSE_OUT,
TOP_MOUSE_OVER,
TOP_POINTER_OUT,
TOP_POINTER_OVER,
} from './DOMTopLevelEventTypes';
import {IS_REPLAYED} from 'legacy-events/EventSystemFlags';
import SyntheticMouseEvent from './SyntheticMouseEvent';
import SyntheticPointerEvent from './SyntheticPointerEvent';
import {
getClosestInstanceFromNode,
getNodeFromInstance,
} from '../client/ReactDOMComponentTree';
import {HostComponent, HostText} from 'shared/ReactWorkTags';
import {getNearestMountedFiber} from 'react-reconciler/reflection';
const eventTypes = {
mouseEnter: {
registrationName: 'onMouseEnter',
dependencies: [TOP_MOUSE_OUT, TOP_MOUSE_OVER],
},
mouseLeave: {
registrationName: 'onMouseLeave',
dependencies: [TOP_MOUSE_OUT, TOP_MOUSE_OVER],
},
pointerEnter: {
registrationName: 'onPointerEnter',
dependencies: [TOP_POINTER_OUT, TOP_POINTER_OVER],
},
pointerLeave: {
registrationName: 'onPointerLeave',
dependencies: [TOP_POINTER_OUT, TOP_POINTER_OVER],
},
};
const 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,
eventSystemFlags,
) {
const isOverEvent =
topLevelType === TOP_MOUSE_OVER || topLevelType === TOP_POINTER_OVER;
const isOutEvent =
topLevelType === TOP_MOUSE_OUT || topLevelType === TOP_POINTER_OUT;
if (
isOverEvent &&
(eventSystemFlags & IS_REPLAYED) === 0 &&
(nativeEvent.relatedTarget || nativeEvent.fromElement)
) {
// If this is an over event with a target, then we've already dispatched
// the event in the out event of the other target. If this is replayed,
// then it's because we couldn't dispatch against this target previously
// so we have to do it now instead.
return null;
}
if (!isOutEvent && !isOverEvent) {
// Must not be a mouse or pointer in or out - ignoring.
return null;
}
let win;
if (nativeEventTarget.window === nativeEventTarget) {
// `nativeEventTarget` is probably a window object.
win = nativeEventTarget;
} else {
// TODO: Figure out why `ownerDocument` is sometimes undefined in IE8.
const doc = nativeEventTarget.ownerDocument;
if (doc) {
win = doc.defaultView || doc.parentWindow;
} else {
win = window;
}
}
let from;
let to;
if (isOutEvent) {
from = targetInst;
const related = nativeEvent.relatedTarget || nativeEvent.toElement;
to = related ? getClosestInstanceFromNode(related) : null;
if (to !== null) {
const nearestMounted = getNearestMountedFiber(to);
if (
to !== nearestMounted ||
(to.tag !== HostComponent && to.tag !== HostText)
) {
to = 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;
}
let eventInterface, leaveEventType, enterEventType, eventTypePrefix;
if (topLevelType === TOP_MOUSE_OUT || topLevelType === TOP_MOUSE_OVER) {
eventInterface = SyntheticMouseEvent;
leaveEventType = eventTypes.mouseLeave;
enterEventType = eventTypes.mouseEnter;
eventTypePrefix = 'mouse';
} else if (
topLevelType === TOP_POINTER_OUT ||
topLevelType === TOP_POINTER_OVER
) {
eventInterface = SyntheticPointerEvent;
leaveEventType = eventTypes.pointerLeave;
enterEventType = eventTypes.pointerEnter;
eventTypePrefix = 'pointer';
}
const fromNode = from == null ? win : getNodeFromInstance(from);
const toNode = to == null ? win : getNodeFromInstance(to);
const leave = eventInterface.getPooled(
leaveEventType,
from,
nativeEvent,
nativeEventTarget,
);
leave.type = eventTypePrefix + 'leave';
leave.target = fromNode;
leave.relatedTarget = toNode;
const enter = eventInterface.getPooled(
enterEventType,
to,
nativeEvent,
nativeEventTarget,
);
enter.type = eventTypePrefix + 'enter';
enter.target = toNode;
enter.relatedTarget = fromNode;
accumulateEnterLeaveDispatches(leave, enter, from, to);
if (isOutEvent && from && nativeEventTarget !== fromNode) {
return [leave];
}
return [leave, enter];
},
};
export default EnterLeaveEventPlugin;