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Use the zipper package to model state"

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Tessa Kelly 2019-04-12 10:43:49 -07:00
parent d4078999ec
commit 1586545b06
1 changed files with 14 additions and 23 deletions
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37
styleguide-app/Examples/Slide.elm
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@ -10,6 +10,7 @@ import Accessibility.Styled as Html
import Css
import Html.Styled.Attributes exposing (css)
import Html.Styled.Keyed as Keyed
import List.Zipper as Zipper exposing (Zipper(..))
import ModuleExample exposing (Category(..), ModuleExample)
import Nri.Ui.Button.V8 as Button
import Nri.Ui.Colors.V1 as Colors
@ -24,7 +25,7 @@ type Msg
{-| -}
type alias State =
{ direction : Slide.AnimationDirection
, current : Panel
, panels : Zipper Panel
, previous : Maybe Panel
}
@ -46,11 +47,11 @@ example parentMessage state =
(case state.previous of
Just previousPanel ->
[ viewPanel previousPanel (Slide.animateOut state.direction)
, viewPanel state.current (Slide.animateIn state.direction)
, viewPanel (Zipper.current state.panels) (Slide.animateIn state.direction)
]
Nothing ->
[ viewPanel state.current (Css.batch [])
[ viewPanel (Zipper.current state.panels) (Css.batch [])
]
)
, Html.div
@ -73,7 +74,7 @@ example parentMessage state =
init : State
init =
{ direction = Slide.FromRTL
, current = One
, panels = Zipper [] One [ Two, Three ]
, previous = Nothing
}
@ -85,26 +86,16 @@ update msg state =
TriggerAnimation direction ->
( { state
| direction = direction
, current =
case ( direction, state.current ) of
( Slide.FromRTL, One ) ->
Three
, panels =
case direction of
Slide.FromRTL ->
Zipper.next state.panels
|> Maybe.withDefault (Zipper.first state.panels)
( Slide.FromRTL, Two ) ->
One
( Slide.FromRTL, Three ) ->
Two
( Slide.FromLTR, One ) ->
Two
( Slide.FromLTR, Two ) ->
Three
( Slide.FromLTR, Three ) ->
One
, previous = Just state.current
Slide.FromLTR ->
Zipper.previous state.panels
|> Maybe.withDefault (Zipper.last state.panels)
, previous = Just (Zipper.current state.panels)
}
, Cmd.none
)