Focus events

Focus events are fired when a View gains or loses input focus. Accordingly, two events are possible:

The main event data listener has the following format:

func(View).

You can also use a listener in the following format:

func()

You can get lists of listeners for focus events using the functions:

func GetFocusListeners(view View, subviewID ...string) []func(View)
func GetLostFocusListeners(view View, subviewID ...string) []func(View)