Disabled inputs can no longer be selected

elements/basic/textbox.go

@@ -39,6 +39,7 @@ func (element *TextBox) Resize (width, height int) {
 }
 
 func (element *TextBox) HandleMouseDown (x, y int, button tomo.Button) {
+	if !element.enabled { return }
 	element.Select()
 }
 

examples/input/main.go

@@ -17,6 +17,7 @@ func run () {
 
 	firstName    := basic.NewTextBox("First name", "")
 	lastName     := basic.NewTextBox("Last name", "")
+	lastName.SetEnabled(false)
 	fingerLength := basic.NewTextBox("Length of fingers", "")
 	button       := basic.NewButton("Ok")