[ Version ( deprecated = true , deprecated_since = "2.9.4" ) ]
public static uint add_focus_tracker (EventListener focus_tracker)
Warning: add_focus_tracker is deprecated since 2.9.4.
Adds the specified function to the list of functions to be called when an object receives focus.
Focus tracking has been dropped as a feature to be implemented by ATK itself.
If you need focus tracking on your implementation, subscribe to the state_change "focused" signal.
Function to be added to the list of functions to be called when an object receives focus.
added focus tracker id, or 0 on failure.