The fact that actors are objects becomes very much apparent when we see how menu events are defined in Red. The definition of a menu starts by declaring a layout object. Then, via a /menu field, the menu titles and submenus are defined as a list. Each submenu is a deeper nested level in the list, for example:
; see Chapter09/menu.red:mex: layout [title "Menu example" ar: area cyan 400x400]mex/menu: [ "File" [ "Load" load --- "Save" sv --- "Save As" svas --- "Print" prnt ] "Sub-menus" [ "Submenu1" s1 "Submenu2" s2 "Submenu3" [ "Submenu4" s4 "Submenu5" s5 ] ] "Tools" [ "Text Size" txts ] "Help" [ "Some Help" hlp ] "Quit" [ "Close all" qt]]
Each menu item has a title as a string and a word, which stores the event that occurs when this ...
