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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) {
if (keyBuf[0] === 127) {
this.value = (
this.value.slice(0, this.cursorIndex - 1) +
this.value.slice(this.cursorIndex)
)
this.cursorIndex--
this.root.cursorMoved()
} 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()
}
} else if (telc.isEscape(keyBuf)) {
// ESC is bad and we don't want that in the text input!
return
} 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()
this.keepCursorInRange()
return false
}
}
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--
}
}
}
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