public abstract class EventController : Object
`GtkEventController` is the base class for event controllers.
These are ancillary objects associated to widgets, which react to `GdkEvents`, and possibly trigger actions as a consequence.
Event controllers are added to a widget with [method@Gtk.Widget.add_controller]. It is rarely necessary to explicitly remove a controller with [method@Gtk.Widget.remove_controller].
See the chapter of [input handling](input-handling.html) for an overview of the basic concepts, such as the capture and bubble phases of even propagation.