EventHandler::Event

Basic event class; all events must inherit from Event.

This abstract class is generally not used directly; see macro event.

To extend the class produced by event if needed, either reopen the class after defining it with event:

event ClickedEvent, x : Int32, y : Int32

class ClickedEvent < ::EventHandler::Event
  property test : String?
end

or create the whole class manually:

class ClickedEvent < ::EventHandler::Event
  getter x : Int32
  getter y : Int32
  property test : String?

  def initialize(@x, @y)
  end
end

Every event class gets the aliases Handler, Wrapper and Channel (e.g. ClickedEvent::Channel is ::Channel(ClickedEvent)). Inside the class body they shadow the top-level names, so a field holding a channel is declared as reply : ::Channel(String), with the leading ::.