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Copy patheditbox.go
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149 lines (121 loc) · 3.15 KB
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package main
import (
"unicode/utf8"
"github.com/nsf/termbox-go"
)
type Editbox struct {
text []byte
line_voffset int
cursor_boffset int // cursor offset in bytes
cursor_voffset int // visual cursor offset in termbox cells
cursor_coffset int // cursor offset in unicode code points
// colors
fg termbox.Attribute
bg termbox.Attribute
}
// Draws the Editbox in the given location
func (e *Editbox) Draw(x, y, w int) {
e.AdjustVOffset(w)
tclear(x, y, w, 1)
t := e.text
lx := 0
for {
rx := lx - e.line_voffset
if len(t) == 0 {
break
}
if rx >= w {
termbox.SetCell(x+w-1, y, '→', e.fg, e.bg)
break
}
r, size := utf8.DecodeRune(t)
if rx >= 0 {
termbox.SetCell(x+rx, y, r, e.fg, e.bg)
}
lx += 1
t = t[size:]
}
if e.line_voffset != 0 {
termbox.SetCell(x, y, '←', e.fg, e.bg)
}
}
// Adjusts line visual offset to a proper value depending on width
func (m *Editbox) AdjustVOffset(width int) {
ht := 0
threshold := width - 1
if m.line_voffset != 0 {
threshold = width - ht
}
if m.cursor_voffset-m.line_voffset >= threshold {
m.line_voffset = m.cursor_voffset + (ht - width + 1)
}
if m.line_voffset != 0 && m.cursor_voffset-m.line_voffset < ht {
m.line_voffset = m.cursor_voffset - ht
if m.line_voffset < 0 {
m.line_voffset = 0
}
}
}
func (m *Editbox) Contents() string {
return string(m.text)
}
func (m *Editbox) MoveCursorTo(boffset int) {
m.cursor_boffset = boffset
m.cursor_voffset, m.cursor_coffset = voffset_coffset(m.text, boffset)
}
func (m *Editbox) RuneUnderCursor() (rune, int) {
return utf8.DecodeRune(m.text[m.cursor_boffset:])
}
func (m *Editbox) RuneBeforeCursor() (rune, int) {
return utf8.DecodeLastRune(m.text[:m.cursor_boffset])
}
func (m *Editbox) MoveCursorOneRuneBackward() {
if m.cursor_boffset == 0 {
return
}
_, size := m.RuneBeforeCursor()
m.MoveCursorTo(m.cursor_boffset - size)
}
func (m *Editbox) MoveCursorOneRuneForward() {
if m.cursor_boffset == len(m.text) {
return
}
_, size := m.RuneUnderCursor()
m.MoveCursorTo(m.cursor_boffset + size)
}
func (m *Editbox) MoveCursorToBeginningOfTheLine() {
m.MoveCursorTo(0)
}
func (m *Editbox) MoveCursorToEndOfTheLine() {
m.MoveCursorTo(len(m.text))
}
func (m *Editbox) DeleteRuneBackward() {
if m.cursor_boffset == 0 {
return
}
m.MoveCursorOneRuneBackward()
_, size := m.RuneUnderCursor()
m.text = byte_slice_remove(m.text, m.cursor_boffset, m.cursor_boffset+size)
}
func (m *Editbox) DeleteRuneForward() {
if m.cursor_boffset == len(m.text) {
return
}
_, size := m.RuneUnderCursor()
m.text = byte_slice_remove(m.text, m.cursor_boffset, m.cursor_boffset+size)
}
func (m *Editbox) DeleteTheRestOfTheLine() {
m.text = m.text[:m.cursor_boffset]
}
func (m *Editbox) InsertRune(r rune) {
var buf [utf8.UTFMax]byte
n := utf8.EncodeRune(buf[:], r)
m.text = byte_slice_insert(m.text, m.cursor_boffset, buf[:n])
m.MoveCursorOneRuneForward()
// fmt.Println("NEW", buf, string(m.text))
}
// Please, keep in mind that cursor depends on the value of line_voffset, which
// is being set on Draw() call, so.. call this method after Draw() one.
func (m *Editbox) CursorX() int {
return m.cursor_voffset - m.line_voffset
}