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
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
|
/**
* 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 ExecutionEnvironment = require('fbjs/lib/ExecutionEnvironment');
var getNodeForCharacterOffset = require('./getNodeForCharacterOffset');
var getTextContentAccessor = require('./getTextContentAccessor');
/**
* While `isCollapsed` is available on the Selection object and `collapsed`
* is available on the Range object, IE11 sometimes gets them wrong.
* If the anchor/focus nodes and offsets are the same, the range is collapsed.
*/
function isCollapsed(anchorNode, anchorOffset, focusNode, focusOffset) {
return anchorNode === focusNode && anchorOffset === focusOffset;
}
/**
* Get the appropriate anchor and focus node/offset pairs for IE.
*
* The catch here is that IE's selection API doesn't provide information
* about whether the selection is forward or backward, so we have to
* behave as though it's always forward.
*
* IE text differs from modern selection in that it behaves as though
* block elements end with a new line. This means character offsets will
* differ between the two APIs.
*
* @param {DOMElement} node
* @return {object}
*/
function getIEOffsets(node) {
var selection = document.selection;
var selectedRange = selection.createRange();
var selectedLength = selectedRange.text.length;
// Duplicate selection so we can move range without breaking user selection.
var fromStart = selectedRange.duplicate();
fromStart.moveToElementText(node);
fromStart.setEndPoint('EndToStart', selectedRange);
var startOffset = fromStart.text.length;
var endOffset = startOffset + selectedLength;
return {
start: startOffset,
end: endOffset
};
}
/**
* @param {DOMElement} node
* @return {?object}
*/
function getModernOffsets(node) {
var selection = window.getSelection && window.getSelection();
if (!selection || selection.rangeCount === 0) {
return null;
}
var anchorNode = selection.anchorNode;
var anchorOffset = selection.anchorOffset;
var focusNode = selection.focusNode;
var focusOffset = selection.focusOffset;
var currentRange = selection.getRangeAt(0);
// In Firefox, range.startContainer and range.endContainer can be "anonymous
// divs", e.g. the up/down buttons on an <input type="number">. Anonymous
// divs do not seem to expose properties, triggering a "Permission denied
// error" if any of its properties are accessed. The only seemingly possible
// way to avoid erroring is to access a property that typically works for
// non-anonymous divs and catch any error that may otherwise arise. See
// https://bugzilla.mozilla.org/show_bug.cgi?id=208427
try {
/* eslint-disable no-unused-expressions */
currentRange.startContainer.nodeType;
currentRange.endContainer.nodeType;
/* eslint-enable no-unused-expressions */
} catch (e) {
return null;
}
// If the node and offset values are the same, the selection is collapsed.
// `Selection.isCollapsed` is available natively, but IE sometimes gets
// this value wrong.
var isSelectionCollapsed = isCollapsed(selection.anchorNode, selection.anchorOffset, selection.focusNode, selection.focusOffset);
var rangeLength = isSelectionCollapsed ? 0 : currentRange.toString().length;
var tempRange = currentRange.cloneRange();
tempRange.selectNodeContents(node);
tempRange.setEnd(currentRange.startContainer, currentRange.startOffset);
var isTempRangeCollapsed = isCollapsed(tempRange.startContainer, tempRange.startOffset, tempRange.endContainer, tempRange.endOffset);
var start = isTempRangeCollapsed ? 0 : tempRange.toString().length;
var end = start + rangeLength;
// Detect whether the selection is backward.
var detectionRange = document.createRange();
detectionRange.setStart(anchorNode, anchorOffset);
detectionRange.setEnd(focusNode, focusOffset);
var isBackward = detectionRange.collapsed;
return {
start: isBackward ? end : start,
end: isBackward ? start : end
};
}
/**
* @param {DOMElement|DOMTextNode} node
* @param {object} offsets
*/
function setIEOffsets(node, offsets) {
var range = document.selection.createRange().duplicate();
var start, end;
if (offsets.end === undefined) {
start = offsets.start;
end = start;
} else if (offsets.start > offsets.end) {
start = offsets.end;
end = offsets.start;
} else {
start = offsets.start;
end = offsets.end;
}
range.moveToElementText(node);
range.moveStart('character', start);
range.setEndPoint('EndToStart', range);
range.moveEnd('character', end - start);
range.select();
}
/**
* In modern non-IE browsers, we can support both forward and backward
* selections.
*
* Note: IE10+ supports the Selection object, but it does not support
* the `extend` method, which means that even in modern IE, it's not possible
* to programmatically create a backward selection. Thus, for all IE
* versions, we use the old IE API to create our selections.
*
* @param {DOMElement|DOMTextNode} node
* @param {object} offsets
*/
function setModernOffsets(node, offsets) {
if (!window.getSelection) {
return;
}
var selection = window.getSelection();
var length = node[getTextContentAccessor()].length;
var start = Math.min(offsets.start, length);
var end = offsets.end === undefined ? start : Math.min(offsets.end, length);
// IE 11 uses modern selection, but doesn't support the extend method.
// Flip backward selections, so we can set with a single range.
if (!selection.extend && start > end) {
var temp = end;
end = start;
start = temp;
}
var startMarker = getNodeForCharacterOffset(node, start);
var endMarker = getNodeForCharacterOffset(node, end);
if (startMarker && endMarker) {
var range = document.createRange();
range.setStart(startMarker.node, startMarker.offset);
selection.removeAllRanges();
if (start > end) {
selection.addRange(range);
selection.extend(endMarker.node, endMarker.offset);
} else {
range.setEnd(endMarker.node, endMarker.offset);
selection.addRange(range);
}
}
}
var useIEOffsets = ExecutionEnvironment.canUseDOM && 'selection' in document && !('getSelection' in window);
var ReactDOMSelection = {
/**
* @param {DOMElement} node
*/
getOffsets: useIEOffsets ? getIEOffsets : getModernOffsets,
/**
* @param {DOMElement|DOMTextNode} node
* @param {object} offsets
*/
setOffsets: useIEOffsets ? setIEOffsets : setModernOffsets
};
module.exports = ReactDOMSelection;
|
