USING: accessors timers calendar kernel models sequences ui
ui.gadgets ui.gadgets.labels ui.gestures ;
FROM: models => change-model ;
IN: rosetta.animation

CONSTANT: sentence "Hello World! "

TUPLE: animated-label < label-control reversed alarm ;
: <animated-label> ( model -- <animated-model> )
    sentence animated-label new-label swap >>model
    monospace-font >>font ;
: update-string ( str reverse -- str )
    [ unclip-last prefix ] [ unclip suffix ] if ;
: update-model ( model reversed? -- )
    [ update-string ] curry change-model ;

animated-label
    H{
        { T{ button-down } [ [ not ] change-reversed drop ] }
     } set-gestures

M: animated-label graft*
  [ [ [ model>> ] [ reversed>> ] bi update-model ] curry 400 milliseconds every ] keep
  alarm<< ;
M: animated-label ungraft*
    alarm>> stop-timer ;
: main ( -- )
   [ sentence <model> <animated-label> "Rosetta" open-window ] with-ui ;

MAIN: main