+ *
+ * Signals
+ * | %Signal Name | Method |
+ * |----------------------------------|------------------------------------|
+ * | keyboard-pre-focus-change | @ref PreFocusChangeSignal() |
+ * | keyboard-focus-changed | @ref FocusChangedSignal() |
+ * | keyboard-focus-group-changed | @ref FocusGroupChangedSignal() |
+ * | keyboard-focused-actor-activated | @ref FocusedActorActivatedSignal() |