Shortest GUI program written in Golang. It displays a window and exits when the "close" button of the window is clicked.

try_shiny_2.go

// Shortest GUI program written in Golang.
// It displays a window and exits when the "close" button of the window is clicked.
package main

import (
	"golang.org/x/exp/shiny/driver"
	"golang.org/x/exp/shiny/screen"

	// Despite that the package names have a "mobile" prefix,
	// these packages works on desktop.
	"golang.org/x/mobile/event/lifecycle"
	"golang.org/x/mobile/event/paint"
	"golang.org/x/mobile/event/size"
)

func main() {
	driver.Main(func(s screen.Screen) {
		w, err := s.NewWindow(nil)
		if err != nil {
			panic(err)
		}
		defer w.Release()

		for {
			switch e := w.NextEvent().(type) {
			case size.Event:
				if e.WidthPx == 0 && e.HeightPx == 0 {
					return
				}
			case paint.Event:
				w.Publish()
			case lifecycle.Event:
				if e.To == lifecycle.StageDead {
					return
				}
			}
		}
	})
}