added basic ui, added working clock and battery indicator

battery.go

@@ -0,0 +1,79 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+	"time"
+
+	"github.com/mattn/go-gtk/glib"
+)
+
+func initBattery(a *App) {
+	base := "/sys/class/power_supply"
+	entries, err := os.ReadDir(base)
+	if err != nil {
+		fmt.Println("battery init:", err)
+		return
+	}
+
+	var folder string
+	for _, e := range entries {
+		if strings.Contains(strings.ToLower(e.Name()), "bat") {
+			folder = e.Name()
+			break
+		}
+	}
+	if folder == "" {
+		fmt.Println("no battery folder found")
+		return
+	}
+	rootPath := base + "/" + folder
+
+	info, err := readBattery(rootPath)
+	if err != nil {
+		fmt.Println("read battery:", err)
+		return
+	}
+	a.battery = info
+	a.updateBatteryLabel(info)
+
+	go func() {
+		last := info
+		for {
+			cur, err := readBattery(rootPath)
+			if err == nil &&
+				(cur.Percent != last.Percent || cur.Charging != last.Charging) {
+				last = cur
+				a.battery = cur
+				glib.IdleAdd(func() {
+					a.updateBatteryLabel(cur)
+				})
+			}
+			time.Sleep(30 * time.Second)
+		}
+	}()
+
+}
+
+func readBattery(rootPath string) (BatteryInfo, error) {
+	val, err := os.ReadFile(rootPath + "/capacity")
+	if err != nil {
+		return BatteryInfo{}, err
+	}
+	status, err := os.ReadFile(rootPath + "/status")
+	if err != nil {
+		return BatteryInfo{}, err
+	}
+
+	p, err := strconv.Atoi(strings.TrimSpace(string(val)))
+	if err != nil {
+		return BatteryInfo{}, err
+	}
+
+	s := strings.ToLower(strings.TrimSpace(string(status)))
+	charging := !strings.Contains(s, "dis")
+
+	return BatteryInfo{Percent: p, Charging: charging, Path: rootPath}, nil
+}

go.mod

@@ -2,7 +2,10 @@ module main
 
 go 1.25.2
 
-require github.com/mattn/go-gtk v0.0.0-20240119050609-48574e312fac
+require (
+	github.com/mattn/go-gtk v0.0.0-20240119050609-48574e312fac
+	golang.org/x/sys v0.37.0
+)
 
 require (
 	github.com/mattn/go-pointer v0.0.1 // indirect

go.sum

@@ -8,5 +8,7 @@ github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZb
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu7U=
 github.com/stretchr/testify v1.11.1/go.mod h1:wZwfW3scLgRK+23gO65QZefKpKQRnfz6sD981Nm4B6U=
+golang.org/x/sys v0.37.0 h1:fdNQudmxPjkdUTPnLn5mdQv7Zwvbvpaxqs831goi9kQ=
+golang.org/x/sys v0.37.0/go.mod h1:OgkHotnGiDImocRcuBABYBEXf8A9a87e/uXjp9XT3ks=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=

main.go

@@ -4,45 +4,128 @@ package main
 import "C"
 
 import (
+	"fmt"
+	"runtime"
+	"time"
+
+	"github.com/mattn/go-gtk/gdk"
+	"github.com/mattn/go-gtk/glib"
 	"github.com/mattn/go-gtk/gtk"
 )
 
+func screenSizeWithFallback() (int, int) {
+	w, h := gdk.ScreenWidth(), gdk.ScreenHeight()
+	if w <= 0 || h <= 0 {
+		// Kindle Paperwhite 4 portrait as a safe fallback
+		return 1072, 1448
+	}
+	return w, h
+}
+
+type App struct {
+	battery      BatteryInfo
+	batteryLabel *gtk.Label
+}
+
+type BatteryInfo struct {
+	Percent  int
+	Charging bool
+	Path     string
+}
+
+func startMinuteClock(onTick func(now time.Time)) (stop func()) {
+	quit := make(chan struct{})
+	go func() {
+		for {
+			now := time.Now()
+			next := now.Truncate(time.Minute).Add(time.Minute)
+			wait := time.Until(next)
+			select {
+			case <-time.After(wait):
+				n := time.Now()
+				glib.IdleAdd(func() { onTick(n) })
+			case <-quit:
+				return
+			}
+		}
+	}()
+	return func() { close(quit) }
+}
+
 func main() {
+	app := App{}
+	runtime.LockOSThread()
 	gtk.Init(nil)
 
-	// Main window
+	w, h := screenSizeWithFallback()
+	fmt.Printf("Using screen size: %dx%d\n", w, h)
+
 	win := gtk.NewWindow(gtk.WINDOW_TOPLEVEL)
 	win.SetTitle("L:A_N:application_PC:TS_ID:com.lab126.store")
-	win.SetDefaultSize(400, 200)
+	win.SetDefaultSize(w, h)
 	win.Connect("destroy", gtk.MainQuit)
 
-	// Vertical layout container
+	bg := gtk.NewEventBox()
-	vbox := gtk.NewVBox(false, 10)
+	bg.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
-	win.Add(vbox)
+	win.Add(bg)
 
-	// Label
+	// main container
-	label := gtk.NewLabel("Hello Kindle!")
+	root := gtk.NewVBox(false, 0)
-	vbox.PackStart(label, false, false, 10)
+	bg.Add(root)
 
-	// Horizontal box for buttons
+	// top bar
-	hbox := gtk.NewHBox(true, 5)
+	topBar := gtk.NewHBox(false, 8)
-	vbox.PackStart(hbox, false, false, 10)
+	topBar.SetBorderWidth(6)
+	root.PackStart(topBar, false, false, 0)
 
-	// Show button
+	leftStatus := gtk.NewLabel("random info here")
-	btnShow := gtk.NewButtonWithLabel("Show Text")
+	topBar.PackStart(leftStatus, false, false, 8)
-	btnShow.Clicked(func() {
+
-		label.Show()
+	app.batteryLabel = gtk.NewLabel("Batt --%")
+	netLabel := gtk.NewLabel("Wi-Fi")
+	timeLabel := gtk.NewLabel(time.Now().Format("15:04"))
+
+	topBar.PackEnd(timeLabel, false, false, 8)
+	topBar.PackEnd(netLabel, false, false, 8)
+	topBar.PackEnd(app.batteryLabel, false, false, 8)
+
+	//Scrollable content
+	scroll := gtk.NewScrolledWindow(nil, nil)
+	scroll.SetShadowType(gtk.SHADOW_NONE)
+	scroll.SetPolicy(gtk.POLICY_NEVER, gtk.POLICY_NEVER)
+	scroll.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+	root.PackStart(scroll, true, true, 0)
+
+	vp := gtk.NewViewport(nil, nil)
+	vp.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+	scroll.Add(vp)
+
+	content := gtk.NewVBox(false, 14)
+	content.ModifyBG(gtk.STATE_NORMAL, gdk.NewColor("#ffffff"))
+	vp.Add(content)
+
+	title := gtk.NewLabel("")
+	title.SetMarkup("<span size='20000' weight='bold'>some cool text</span>")
+	content.PackStart(title, false, false, 0)
+
+	body := gtk.NewLabel("aaaa")
+	body.SetLineWrap(true)
+	content.PackStart(body, false, false, 0)
+
+	_ = startMinuteClock(func(now time.Time) {
+		timeLabel.SetText(now.Format("15:04"))
 	})
-
+	initBattery(&app)
-	// Hide button
-	btnHide := gtk.NewButtonWithLabel("Hide Text")
-	btnHide.Clicked(func() {
-		label.Hide()
-	})
-
-	hbox.PackStart(btnShow, true, true, 5)
-	hbox.PackStart(btnHide, true, true, 5)
 
 	win.ShowAll()
 	gtk.Main()
 }
+
+func (a *App) updateBatteryLabel(b BatteryInfo) {
+	txt := fmt.Sprintf("%d%%", b.Percent)
+	fmt.Println("changed battery label")
+	if b.Charging {
+		txt += " (charging)"
+	}
+	a.batteryLabel.SetText(txt)
+}