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
|
import React from 'react';
import PropTypes from 'prop-types';
import autosize from 'autosize';
const UPDATE = 'autosize:update',
DESTROY = 'autosize:destroy',
RESIZED = 'autosize:resized';
/** A light replacement for built-in textarea component
* which automaticaly adjusts its height to match the content
* @param onResize - called whenever the textarea resizes
* @param rows - minimum number of visible rows
* @param maxRows - maximum number of visible rows
* @param innerRef - called with the ref to the DOM node
*/
export default class TextareaAutosize extends React.Component {
static defaultProps = {
rows: 1
};
state = {
maxHeight: null
}
componentDidMount() {
const { value, defaultValue, onResize } = this.props;
autosize(this.textarea);
if (this.hasReachedMaxRows(value || defaultValue)) {
this.updateMaxHeight(value || defaultValue);
// this trick is needed to force "autosize" to activate the scrollbar
this.dispatchEvent(DESTROY);
setTimeout(() => autosize(this.textarea));
}
if (onResize) {
this.textarea.addEventListener(RESIZED, this.props.onResize);
}
}
componentWillUnmount() {
if (this.props.onResize) {
this.textarea.removeEventListener(RESIZED, this.props.onResize);
}
this.dispatchEvent(DESTROY);
}
dispatchEvent = (EVENT_TYPE) => {
const event = document.createEvent('Event');
event.initEvent(EVENT_TYPE, true, false);
this.textarea.dispatchEvent(event);
};
getValue = ({ valueLink, value }) => valueLink ? valueLink.value : value;
hasReachedMaxRows = (value) => {
const { maxRows } = this.props;
const numberOfRows = (value || '').split('\n').length;
return numberOfRows >= parseInt(maxRows);
}
updateMaxHeight = (value) => {
const {
props: { maxRows },
state: { maxHeight }
} = this;
const hasReachedMaxRows = this.hasReachedMaxRows(value);
if (!maxHeight && hasReachedMaxRows) {
const numberOfRows = (value || '').split('\n').length;
const computedStyle = window.getComputedStyle(this.textarea);
const paddingTop = parseFloat(computedStyle.getPropertyValue('padding-top'), 10);
const paddingBottom = parseFloat(computedStyle.getPropertyValue('padding-top'), 10);
const verticalPadding = (paddingTop || 0) + (paddingBottom || 0);
const borderTopWidth = parseInt(computedStyle.getPropertyValue('border-top-width'), 10);
const borderBottomWidth = parseInt(computedStyle.getPropertyValue('border-bottom-width'), 10);
const verticalBorderWidth = (borderTopWidth || 0) + (borderBottomWidth || 0);
const height = this.textarea.offsetHeight - verticalPadding - verticalBorderWidth;
this.setState({
maxHeight: height / numberOfRows * maxRows
});
return true;
} else if (maxHeight && !hasReachedMaxRows) {
this.setState({ maxHeight: null });
return false;
}
}
onChange = e => {
this.updateMaxHeight(e.target.value);
this.props.onChange && this.props.onChange(e);
}
saveDOMNodeRef = ref => {
const { innerRef } = this.props;
if (innerRef) {
innerRef(ref);
}
this.textarea = ref;
}
getLocals = () => {
const {
props: { onResize, maxRows, onChange, style, innerRef, ...props }, // eslint-disable-line no-unused-vars
state: { maxHeight },
saveDOMNodeRef
} = this;
return {
...props,
saveDOMNodeRef,
style: maxHeight ? { ...style, maxHeight } : style,
onChange: this.onChange
};
}
render() {
const { children, saveDOMNodeRef, ...locals } = this.getLocals();
return (
<textarea {...locals} ref={saveDOMNodeRef}>
{children}
</textarea>
);
}
componentDidUpdate(prevProps) {
if (this.getValue(prevProps) !== this.getValue(this.props)) {
this.dispatchEvent(UPDATE);
}
}
}
TextareaAutosize.propTypes = {
rows: PropTypes.number,
maxRows: PropTypes.number,
onResize: PropTypes.func,
innerRef: PropTypes.func
};
|
