main.go

package main

import (
	"log/slog"

	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/app"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/widget"
)

type Editor struct {
	widget.TextGrid
}

func NewEditor() *Editor {
	e := &Editor{}
	e.ExtendBaseWidget(e)
	return e
}

// Tappable interface
func (e *Editor) Tapped(pe *fyne.PointEvent) {
	slog.Info("Tapped")
	fyne.CurrentApp().Driver().CanvasForObject(e).Focus(e)
}

// Focusable interface
func (e *Editor) TypedKey(k *fyne.KeyEvent) {
	slog.Info("TypedKey", "k", k)
}

// Focusable interface
func (e *Editor) TypedRune(r rune) {
	input := string(r)
	slog.Info("TypedRune", "input", input)
	e.SetText(input)
	e.Refresh()
}

// Focusable interface
func (e *Editor) FocusGained() {
	slog.Info("FocusGained")
}

// Focusable interface
func (e *Editor) FocusLost() {
	slog.Info("FocusLost")
}

func main() {
	a := app.New()
	window := a.NewWindow("")
	window.Resize(fyne.NewSize(500, 500))

	editor := NewEditor()
	entry := widget.NewEntry()

	editor.SetText("editor area")
	window.SetContent(container.NewVBox(entry, editor))
	window.Canvas().Focus(editor)
	window.ShowAndRun()
}