Implementing multiple events is easy. Here is an example where four actors are defined for a button:
;-- see Chapter09/multiple-events.red:view [ below message: text 100x25 green "Nothing" button "Different things happen" [message/text: "A click!"] ; default event on-over [message/text: "Hovering!"] ; hovering cursor over face on-dbl-click [message/text: "A double click!"] on-wheel [message/text: "Wheeling!"] ; turning mouse wheel]
This is displayed as follows:
Note that a left mouse button click is called on-click only for button widgets, for all other faces it is an on-down, followed by an on-up event.
=> Now answer question ...
