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
|
const ansi = require('../../util/ansi')
const unic = require('../../util/unichars')
const telc = require('../../util/telchars')
const FocusElement = require('./FocusElement')
module.exports = class TextInput extends FocusElement {
// An element that the user can type in.
constructor() {
super()
this.value = ''
this.cursorVisible = true
this.cursorIndex = 0
this.scrollChars = 0
}
drawTo(writable) {
// There should be room for the cursor so move the "right edge" left a
// single character.
const startRange = this.scrollChars
const endRange = this.scrollChars + this.w - 3
let str = this.value.slice(startRange, endRange)
writable.write(ansi.moveCursor(this.absTop, this.absLeft + 1))
writable.write(str)
// Ellipsis on left side, if there's more characters behind the visible
// area.
if (startRange > 0) {
writable.write(ansi.moveCursor(this.absTop, this.absLeft))
writable.write(unic.ELLIPSIS)
}
// Ellipsis on the right side, if there's more characters ahead of the
// visible area.
if (endRange < this.value.length) {
writable.write(ansi.moveCursor(this.absTop, this.absRight - 1))
writable.write(unic.ELLIPSIS.repeat(2))
}
this.cursorX = this.cursorIndex - this.scrollChars + 1
super.drawTo(writable)
}
keyPressed(keyBuf) {
try {
if (keyBuf[0] === 127) {
this.value = (
this.value.slice(0, this.cursorIndex - 1) +
this.value.slice(this.cursorIndex)
)
this.cursorIndex--
this.root.cursorMoved()
return false
} else if (keyBuf[0] === 13) {
this.emit('value', this.value)
} else if (keyBuf[0] === 0x1b && keyBuf[1] === 0x5b) {
// Keyboard navigation
if (keyBuf[2] === 0x44) {
this.cursorIndex--
this.root.cursorMoved()
} else if (keyBuf[2] === 0x43) {
this.cursorIndex++
this.root.cursorMoved()
}
return false
} else if (telc.isEscape(keyBuf)) {
// ESC is bad and we don't want that in the text input!
// Also emit a "cancel" event, which doesn't necessarily do anything,
// but can be listened to.
this.emit('cancel')
} else {
const isTextInput = keyBuf.toString().split('').every(chr => {
const n = chr.charCodeAt(0)
return n > 31 && n < 127
})
if (isTextInput) {
this.value = (
this.value.slice(0, this.cursorIndex) + keyBuf.toString() +
this.value.slice(this.cursorIndex)
)
this.cursorIndex += keyBuf.toString().length
this.root.cursorMoved()
return false
}
}
} finally {
this.keepCursorInRange()
}
}
setValue(value) {
this.value = value
this.moveToEnd()
}
moveToEnd() {
this.cursorIndex = this.value.length
this.keepCursorInRange()
}
keepCursorInRange() {
// Keep the cursor inside or at the end of the input value.
if (this.cursorIndex < 0) {
this.cursorIndex = 0
}
if (this.cursorIndex > this.value.length) {
this.cursorIndex = this.value.length
}
// Scroll right, if the cursor is past the right edge of where text is
// displayed.
while (this.cursorIndex - this.scrollChars > this.w - 3) {
this.scrollChars++
}
// Scroll left, if the cursor is behind the left edge of where text is
// displayed.
while (this.cursorIndex - this.scrollChars < 0) {
this.scrollChars--
}
// Scroll left, if we can see past the end of the text.
while (this.scrollChars > 0 && (
this.scrollChars + this.w - 3 > this.value.length)
) {
this.scrollChars--
}
}
}
|
