114 lines
2.0 KiB
Go
114 lines
2.0 KiB
Go
package uiterm
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import (
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"strings"
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"unicode/utf8"
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"github.com/nsf/termbox-go"
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)
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const maxTextboxLen = 2000
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type Textbox struct {
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Text string
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Fg, Bg Attribute
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Input func(ui *Ui, textbox *Textbox, text string)
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ui *Ui
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active bool
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x0, y0, x1, y1 int
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}
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func (t *Textbox) uiInitialize(ui *Ui) {
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t.ui = ui
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}
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func (t *Textbox) uiSetActive(active bool) {
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t.active = active
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t.uiDraw()
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}
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func (t *Textbox) uiSetBounds(x0, y0, x1, y1 int) {
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t.x0 = x0
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t.y0 = y0
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t.x1 = x1
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t.y1 = y1
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t.uiDraw()
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}
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func (t *Textbox) uiDraw() {
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t.ui.beginDraw()
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defer t.ui.endDraw()
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var setCursor = false
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reader := strings.NewReader(t.Text)
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for y := t.y0; y < t.y1; y++ {
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for x := t.x0; x < t.x1; x++ {
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var chr rune
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if ch, _, err := reader.ReadRune(); err != nil {
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if t.active && !setCursor {
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termbox.SetCursor(x, y)
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setCursor = true
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}
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chr = ' '
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} else {
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chr = ch
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}
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termbox.SetCell(x, y, chr, termbox.Attribute(t.Fg), termbox.Attribute(t.Bg))
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}
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}
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}
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func (t *Textbox) uiKeyEvent(mod Modifier, key Key) {
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redraw := false
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switch key {
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case KeyCtrlC, KeyCtrlU, KeyCtrlK:
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t.Text = ""
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redraw = true
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case KeyCtrlW:
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t.Text = deleteWord(t.Text)
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redraw = true
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case KeyEnter:
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if t.Input != nil {
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t.Input(t.ui, t, t.Text)
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}
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t.Text = ""
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redraw = true
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case KeySpace:
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if len(t.Text) < maxTextboxLen {
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t.Text = t.Text + " "
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redraw = true
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}
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case KeyBackspace:
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case KeyBackspace2:
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if len(t.Text) > 0 {
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if r, size := utf8.DecodeLastRuneInString(t.Text); r != utf8.RuneError {
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t.Text = t.Text[:len(t.Text)-size]
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redraw = true
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}
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}
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}
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if redraw {
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t.uiDraw()
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}
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}
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func deleteWord(s string) string {
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// Trim trailing spaces, then trim non-spaces (the word)
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s = strings.TrimRight(s, " ")
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i := strings.LastIndex(s, " ")
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if i < 0 {
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return ""
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}
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return s[:i+1]
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}
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func (t *Textbox) uiCharacterEvent(chr rune) {
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if len(t.Text) >= maxTextboxLen {
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return
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}
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t.Text = t.Text + string(chr)
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t.uiDraw()
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}
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