tcell ChannelEvents examples

main.go

package main

import (
	"fmt"
	"os"
	"strings"

	"github.com/gdamore/tcell/v2"
	"github.com/gdamore/tcell/v2/encoding"
	"github.com/mattn/go-runewidth"
)

func emit(s tcell.Screen, x, y int, style tcell.Style, str string) {
	for _, c := range str {
		var comb []rune
		w := runewidth.RuneWidth(c)
		if w == 0 {
			comb = []rune{c}
			c = ' '
			w = 1
		}
		s.SetContent(x, y, c, comb, style)
		x += w
	}
}

func display(s tcell.Screen) {
	w, h := s.Size()
	s.Clear()
	emit(s, w/2-7, h/2, tcell.StyleDefault, "Hello, World!")
	emit(s, w/2-10, h/2+1, tcell.StyleDefault, "Press Enter to exit.")
	s.Show()
}
func main() {
	var log strings.Builder

	encoding.Register()

	screen, err := tcell.NewScreen()
	if err != nil {
		os.Exit(1)
	}

	if err := screen.Init(); err != nil {
		os.Exit(1)
	}

	events := make(chan tcell.Event)
	quit := make(chan struct{})
	go screen.ChannelEvents(events, quit)

	display(screen)

loop:
	for ev := range events {
		if ev == nil {
			continue
		}

		log.WriteString(fmt.Sprintf("%#v\n", ev))

		switch ev := ev.(type) {
		case *tcell.EventResize:
			screen.Sync()
			display(screen)
		case *tcell.EventKey:
			if ev.Key() == tcell.KeyEnter {
				screen.Fini()
				break loop
			}
		}
	}

	fmt.Fprint(os.Stderr, log.String())

	os.Exit(0)
}