Progress bars

... And also the Do function works now

examples/progress/main.go

@@ -0,0 +1,40 @@
+package main
+
+import "time"
+import "git.tebibyte.media/sashakoshka/tomo"
+import "git.tebibyte.media/sashakoshka/tomo/layouts"
+import "git.tebibyte.media/sashakoshka/tomo/elements/basic"
+import _ "git.tebibyte.media/sashakoshka/tomo/backends/x"
+
+func main () {
+	tomo.Run(run)
+}
+
+func run () {
+	window, _ := tomo.NewWindow(2, 2)
+	window.SetTitle("Approaching")
+	container := basic.NewContainer(layouts.Vertical { true, true })
+	window.Adopt(container)
+
+	container.Adopt (basic.NewLabel (
+		"Rapidly approaching your location...", false), false)
+	bar := basic.NewProgressBar(0)
+	container.Adopt(bar, false)
+	button := basic.NewButton("Stop")
+	button.SetEnabled(false)
+	container.Adopt(button, false)
+	
+	window.OnClose(tomo.Stop)
+	window.Show()
+	go fill(bar)
+}
+
+func fill (bar *basic.ProgressBar) {
+	println("-")
+	for progress := 0.0; progress < 1.0; progress += 0.01 {
+		time.Sleep(time.Second / 24)
+		tomo.Do(func () {
+			bar.SetProgress(progress)
+		})
+	}
+}