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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