peterhellberg/webview-gui.go

## webview-gui.go
package main

import (
	"fmt"
	"net"
	"net/http"
	"sync"
	"text/template"

	"github.com/zserge/webview"
)

func main() {
	port, err := freePort()
	if err != nil {
		panic("Unable to get a free port")
	}

	addr := fmt.Sprintf("0.0.0.0:%d", port)

	var wg sync.WaitGroup

	wg.Add(1)

	go runServer(addr, &Handler{}, &wg)

	wg.Wait()

	w := webview.New(false)
	defer w.Destroy()

	w.SetTitle("Webview GUI")
	w.SetSize(640, 400, webview.HintFixed)
	w.Navigate("http://" + addr)
	w.Run()
}

func runServer(addr string, handler http.Handler, wg *sync.WaitGroup) error {
	hs := &http.Server{
		Addr:    addr,
		Handler: handler,
	}

	wg.Done()

	return hs.ListenAndServe()
}

func freePort() (int, error) {
	addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
	if err != nil {
		return 0, err
	}

	l, err := net.ListenTCP("tcp", addr)
	if err != nil {
		return 0, err
	}
	defer l.Close()
	return l.Addr().(*net.TCPAddr).Port, nil
}

type Handler struct {
	Count int
}

func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	h.Count++

	t.Execute(w, h)
}

var t = template.Must(template.New("name").Parse(`<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <style>
      body { background-color: #00ADD8; font-family: Helvetica, sans-serif; color: #FFFFFF; }
      h1 { font-size: 4rem; margin-bottom: 0.5rem; }
      a { font-size: 2rem; color: #004759;}
    </style>
  </head>
  <body>
    <h1>Count: {{.Count}}<h1>
    <a href="/">Increment count</a>
  </body>
</html>`))
	package main

	import (
	"fmt"
	"net"
	"net/http"
	"sync"
	"text/template"

	"github.com/zserge/webview"
	)

	func main() {
	port, err := freePort()
	if err != nil {
	panic("Unable to get a free port")
	}

	addr := fmt.Sprintf("0.0.0.0:%d", port)

	var wg sync.WaitGroup

	wg.Add(1)

	go runServer(addr, &Handler{}, &wg)

	wg.Wait()

	w := webview.New(false)
	defer w.Destroy()

	w.SetTitle("Webview GUI")
	w.SetSize(640, 400, webview.HintFixed)
	w.Navigate("http://" + addr)
	w.Run()
	}

	func runServer(addr string, handler http.Handler, wg *sync.WaitGroup) error {
	hs := &http.Server{
	Addr: addr,
	Handler: handler,
	}

	wg.Done()

	return hs.ListenAndServe()
	}

	func freePort() (int, error) {
	addr, err := net.ResolveTCPAddr("tcp", "localhost:0")
	if err != nil {
	return 0, err
	}

	l, err := net.ListenTCP("tcp", addr)
	if err != nil {
	return 0, err
	}
	defer l.Close()
	return l.Addr().(*net.TCPAddr).Port, nil
	}

	type Handler struct {
	Count int
	}

	func (h Handler) ServeHTTP(w http.ResponseWriter, r http.Request) {
	h.Count++

	t.Execute(w, h)
	}

	var t = template.Must(template.New("name").Parse(`<!DOCTYPE html>
	<html lang="en">
	<head>
	<meta charset="utf-8">
	<style>
	body { background-color: #00ADD8; font-family: Helvetica, sans-serif; color: #FFFFFF; }
	h1 { font-size: 4rem; margin-bottom: 0.5rem; }
	a { font-size: 2rem; color: #004759;}
	</style>
	</head>
	<body>
	<h1>Count: {{.Count}}<h1>
	<a href="/">Increment count</a>
	</body>
	</html>`))