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package tui
import (
"github.com/rivo/uniseg"
"zgo.at/termfo/keys"
"strings"
)
type TextInput struct {
id string
linesBefore []string
beforeCursor string
selection string
selectionBefore bool
afterCursor string
linesAfter []string
}
func (t *TextInput) Text() string {
return t.beforeCursor + t.selection + t.afterCursor
}
func (t *TextInput) SetText(text string) {
t.beforeCursor = ""
t.afterCursor = text
}
func toGraphemes(s string) []string {
g := uniseg.NewGraphemes(s)
var result []string
for g.Next() {
result = append(result, g.Str())
}
return result
}
func splitRight(s string) (string, string) {
if s == "" {
return "", ""
}
gs := toGraphemes(s)
return strings.Join(gs[:len(gs) - 1], ""), gs[len(gs) - 1]
}
func splitLeft(s string) (string, string) {
if s == "" {
return "", ""
}
cluster, rest, _, _ := uniseg.FirstGraphemeCluster([]byte(s), 0)
return string(cluster), string(rest)
}
func (t *TextInput) Left(selection bool, word bool) {
t.Deselect()
var right string
t.beforeCursor, right = splitRight(t.beforeCursor)
t.afterCursor = right + t.afterCursor
}
func (t *TextInput) Right(selection bool, word bool) {
t.Deselect()
var left string
left, t.afterCursor = splitLeft(t.afterCursor)
t.beforeCursor += left
}
func (t *TextInput) Start(selection bool) {
t.afterCursor = t.beforeCursor + t.afterCursor
t.beforeCursor = ""
}
func (t *TextInput) End(selection bool) {
t.beforeCursor = t.beforeCursor + t.afterCursor
t.afterCursor = ""
}
func (t *TextInput) Selection() string {
return t.selection
}
func (t *TextInput) Deselect() {
if t.selectionBefore {
t.beforeCursor += t.selection
} else {
t.afterCursor = t.selection + t.afterCursor
}
t.selection = ""
}
func (t *TextInput) Write(text string) {
t.selection = ""
t.beforeCursor += text
}
func (t *TextInput) Update(ev Event) (usedKeybind bool) {
if Selected != t.id {
return
}
if ev.TextInput != 0 {
t.Write(string(ev.TextInput))
}
selection := ev.Key & keys.Shift != 0
word := ev.Key & keys.Ctrl != 0
switch ev.Key.WithoutMods() {
case keys.Left:
t.Left(selection, word)
case keys.Right:
t.Right(selection, word)
case 'a':
if ev.Key & keys.Ctrl != 0 {
t.Start(selection)
}
case 'e':
if ev.Key & keys.Ctrl != 0 {
t.End(selection)
}
case keys.Backspace:
if t.selection != "" {
t.selection = ""
} else {
t.beforeCursor, _ = splitRight(t.beforeCursor)
}
default:
return false
}
return true
}
func (t *TextInput) Show(id string) {
t.id = id
Push(id, Box {Width: Fill, Height: 4})//TextSize})
Text(t.beforeCursor, nil)
if t.selectionBefore {
Text(t.selection, &Style {Bg: Blue, Fg: White, selected: true})
}
Cursor()
if !t.selectionBefore {
Text(t.selection, &Style {Bg: Blue, Fg: White, selected: true})
}
Text(t.afterCursor, nil)
Pop()
}
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