Elm Day 2: Mouse Position

elm-day-2-mouse-position.elm

import Html exposing (Html, text, div)
import Html.App as App
import Mouse exposing (..)

main = App.program { init = init,
       view = view, update = update, subscriptions = subscriptions }
       
-- Model

type alias Model = { x: Int, y: Int }

initialModel : Model
initialModel = { x = 0, y = 0 }
init = (initialModel, Cmd.none)

-- Update

type Msg = Position Int Int

update: Msg -> Model -> (Model, Cmd a)
update msg model = case msg of
                     Position x y -> ({model | x = x, y = y}, Cmd.none)
                     
-- Subscriptions
subscriptions: Model -> Sub Msg
subscriptions model = Mouse.moves(\{x, y} -> Position x y)

-- View
-- view: Model -> Html div
view model = div [] [text (toString model)]

I needed to remove the Html.App import (line #2) and change App.program to Html.program (line #5) to run on 0.18