Created
April 25, 2016 23:01
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import Signal exposing (Address) | |
import Html exposing (Html, button, text, div) | |
import Html.Events exposing (onClick) | |
import StartApp.Simple as StartApp exposing (start) | |
type alias State = | |
{ counter : Int } | |
type Action | |
= Increment | |
| Decrement | |
update : Action -> State -> State | |
update action state = | |
case action of | |
Increment -> | |
{ state | counter = state.counter + 1 } | |
Decrement -> | |
{ state | counter = state.counter - 1 } | |
type alias ViewState = | |
{ textLabel : String | |
, button1Label : String | |
, button2Label : String | |
} | |
type Event | |
= Button1Click | |
| Button2Click | |
view : Address Event -> ViewState -> Html | |
view address state = | |
div [] | |
[ button | |
[ onClick address Button1Click ] | |
[ text state.button1Label ] | |
, button | |
[ onClick address Button2Click ] | |
[ text state.button2Label ] | |
, text state.textLabel | |
] | |
eventToAction : Event -> Action | |
eventToAction event = | |
case event of | |
Button1Click -> | |
Increment | |
Button2Click -> | |
Decrement | |
stateToViewState : State -> ViewState | |
stateToViewState state = | |
{ textLabel = toString state.counter | |
, button1Label = "Increment" | |
, button2Label = "Decrement" | |
} | |
render : Address Action -> State -> Html | |
render address state = | |
view (Signal.forwardTo address eventToAction) (stateToViewState state) | |
main = | |
start | |
{ model = State 0 | |
, update = update | |
, view = render | |
} | |
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