text input box

1 files changed, 134 insertions, 6 deletions

diff --git a/tui/text_input.go b/tui/text_input.go
index a8c7d6d..3bceb24 100644
--- a/tui/text_input.go
+++ b/tui/text_input.go
@@ -1,15 +1,143 @@
 package tui
 
 import (
-//	"github.com/rivo/uniseg"
-//	"strings"
+	"github.com/rivo/uniseg"
+	"zgo.at/termfo/keys"
+	"strings"
 )
 
 type TextInput struct {
-	Contents string
-	Cursor int
+	id string
+	linesBefore []string
+	beforeCursor string
+	selection string
+	selectionBefore bool
+	afterCursor string
+	linesAfter []string
 }
 
-func (t *TextInput) Update(ev Event) {
-	t.Cursor = max(t.Cursor, 0)
+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()
 }