initial commit

uiterm/textbox.go

@@ -0,0 +1,88 @@
+package uiterm
+
+import (
+	"strings"
+	"unicode/utf8"
+
+	"github.com/nsf/termbox-go"
+)
+
+type InputFunc func(ui *Ui, textbox *Textbox, text string)
+
+type Textbox struct {
+	Text string
+	Fg   Attribute
+	Bg   Attribute
+
+	Input InputFunc
+
+	active         bool
+	x0, y0, x1, y1 int
+}
+
+func (t *Textbox) SetBounds(ui *Ui, x0, y0, x1, y1 int) {
+	t.x0 = x0
+	t.y0 = y0
+	t.x1 = x1
+	t.y1 = y1
+}
+
+func (t *Textbox) SetActive(ui *Ui, active bool) {
+	t.active = active
+}
+
+func (t *Textbox) Draw(ui *Ui) {
+	var setCursor = false
+	reader := strings.NewReader(t.Text)
+	for y := t.y0; y < t.y1; y++ {
+		for x := t.x0; x < t.x1; x++ {
+			var chr rune
+			if ch, _, err := reader.ReadRune(); err != nil {
+				if t.active && !setCursor {
+					termbox.SetCursor(x, y)
+					setCursor = true
+				}
+				chr = ' '
+			} else {
+				chr = ch
+			}
+			termbox.SetCell(x, y, chr, termbox.Attribute(t.Fg), termbox.Attribute(t.Bg))
+		}
+	}
+}
+
+func (t *Textbox) KeyEvent(ui *Ui, mod Modifier, key Key) {
+	redraw := false
+	switch key {
+	case KeyCtrlC:
+		t.Text = ""
+		redraw = true
+	case KeyEnter:
+		if t.Input != nil {
+			t.Input(ui, t, t.Text)
+		}
+		t.Text = ""
+		redraw = true
+	case KeySpace:
+		t.Text = t.Text + " "
+		redraw = true
+	case KeyBackspace:
+	case KeyBackspace2:
+		if len(t.Text) > 0 {
+			if r, size := utf8.DecodeLastRuneInString(t.Text); r != utf8.RuneError {
+				t.Text = t.Text[:len(t.Text)-size]
+				redraw = true
+			}
+		}
+	}
+	if redraw {
+		t.Draw(ui)
+		termbox.Flush()
+	}
+}
+
+func (t *Textbox) CharacterEvent(ui *Ui, chr rune) {
+	t.Text = t.Text + string(chr)
+	t.Draw(ui)
+	termbox.Flush()
+}