Added event callbacks to text box

examples/input/main.go

@@ -12,32 +12,45 @@ func main () {
 
 func run () {
 	window, _ := tomo.NewWindow(2, 2)
-	window.SetTitle("Approaching")
+	window.SetTitle("Enter Details")
 	container := basic.NewContainer(layouts.Vertical { true, true })
 	window.Adopt(container)
 
+	// create inputs
 	firstName    := basic.NewTextBox("First name", "")
 	lastName     := basic.NewTextBox("Last name", "")
 	fingerLength := basic.NewTextBox("Length of fingers", "")
 	button       := basic.NewButton("Ok")
 
-	lastName.SetEnabled(false)
+	button.SetEnabled(false)
 	button.OnClick (func () {
+		// create a dialog displaying the results
 		popups.NewDialog (
 			popups.DialogKindInfo,
 			"Profile",
-			firstName.Value() + " [REDACTED]'s fingers\n" +
-			"measure in at " + fingerLength.Value() + " feet.")
+			firstName.Value() + " " + lastName.Value() +
+			"'s fingers\nmeasure in at " + fingerLength.Value() +
+			" feet.")
 	})
-	
+
+	// enable the Ok button if all three inputs have text in them
+	check := func () {
+		button.SetEnabled (
+			firstName.Filled() &&
+			lastName.Filled() &&
+			fingerLength.Filled())
+	}
+	firstName.OnChange(check)
+	lastName.OnChange(check)
+	fingerLength.OnChange(check)
+
+	// add elements to container
 	container.Adopt(basic.NewLabel("Choose your words carefully.", false), true)
 	container.Adopt(firstName, false)
 	container.Adopt(lastName, false)
 	container.Adopt(fingerLength, false)
 	container.Adopt(basic.NewSpacer(true), false)
 	container.Adopt(button, false)
-
-	firstName.Select()
 	
 	window.OnClose(tomo.Stop)
 	window.Show()