package main

import (
	"image/color"
	"log"
	"os"

	"gioui.org/app"
	"gioui.org/font/gofont"
	"gioui.org/io/system"
	"gioui.org/layout"
	"gioui.org/op"
	"gioui.org/text"
	"gioui.org/widget/material"
)

func main() {
	go func() {
		w := app.NewWindow()
		err := run(w)
		if err != nil {
			log.Fatal(err)
		}
		os.Exit(0)
	}()
	app.Main()
}

func run(w *app.Window) error {
	th := material.NewTheme(gofont.Collection())
	var ops op.Ops
	for {
		e := <-w.Events()
		switch e := e.(type) {
		case system.DestroyEvent:
			return e.Err
		case system.FrameEvent:
			gtx := layout.NewContext(&ops, e)

			title := material.H1(th, "Hello, Gio")
			maroon := color.NRGBA{R: 127, G: 0, B: 0, A: 255}
			title.Color = maroon
			title.Alignment = text.Middle
			title.Layout(gtx)

			e.Frame(gtx.Ops)
		}
	}
}