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AutocompleteWrapper.elm
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AutocompleteWrapper.elm
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module AutocompleteWrapper exposing (..)
import Autocomplete
import Dom
import Html exposing (..)
import Html.Attributes exposing (..)
import Html.Events exposing (..)
import Json.Decode as Decode
import Task
type Msg
= SetQuery String
| SetAutoState Autocomplete.Msg
| Wrap Bool
| SelectMenuItemKeyboard String
| SelectMenuItemMouse String
| PreviewMenuItem String
| HandleEscape
| OnFocusAutocom
| OnBlurAutocom
| PreventFocusAndBlur
| Reset
| NoOpAutocom
type alias MenuItem =
String
type alias Model =
{ value : String
, id : String
, name : String
, menuItems : List MenuItem
, state : Autocomplete.State
, howManyToShow : Int
, selectedMenuItem : Maybe MenuItem
, showMenu : Bool
, focus : Bool
, preventingBlur : Bool
, preventingFocus : Bool
}
init : String -> String -> List MenuItem -> Model
init id name menuItems1 =
{ value = ""
, id = id
, name = name
, menuItems = menuItems1
, state = Autocomplete.empty
, howManyToShow = 50
, selectedMenuItem = Nothing
, showMenu = False
, focus = False
, preventingBlur = False
, preventingFocus = False
}
update :
Msg
-> Model
-> (String -> Msg -> msg)
-> (msg -> ( a, Msg ))
-> ( Model, Cmd msg )
update msg model originMessage msgConverter =
case msg of
SetQuery newQuery ->
let
showMenu =
not << List.isEmpty <| acceptableItems newQuery model.menuItems
in
{ model
| value = newQuery
, showMenu = showMenu
, selectedMenuItem = Nothing
}
! []
SetAutoState autoMsg ->
if not model.focus then
model ! []
else
let
( newState, maybeMsg ) =
Autocomplete.update (updateConfig model.id originMessage) autoMsg model.howManyToShow model.state (acceptableItems model.value model.menuItems)
newModel =
{ model | state = newState }
in
case maybeMsg of
Nothing ->
newModel ! []
Just updateMsg ->
let
( id, autocomMsg ) =
msgConverter updateMsg
in
update autocomMsg newModel originMessage msgConverter
Wrap toTop ->
case model.selectedMenuItem of
Just menuItem ->
update Reset model originMessage msgConverter
Nothing ->
if toTop then
{ model
| state = Autocomplete.resetToLastItem (updateConfig model.id originMessage) (acceptableItems model.value model.menuItems) model.howManyToShow model.state
, selectedMenuItem = List.head <| List.reverse <| List.take model.howManyToShow <| acceptableItems model.value model.menuItems
}
! []
else
{ model
| state = Autocomplete.resetToFirstItem (updateConfig model.id originMessage) (acceptableItems model.value model.menuItems) model.howManyToShow model.state
, selectedMenuItem = List.head <| List.take model.howManyToShow <| acceptableItems model.value model.menuItems
}
! []
SelectMenuItemKeyboard id ->
let
newModel =
setQuery model id
|> resetMenu
in
newModel ! []
SelectMenuItemMouse id ->
let
newModel =
setQuery model id
|> resetMenu
msgId =
99
in
-- Giving the focus again (Dom.focus) because it was lost upon
-- the click on the menu
( newModel, Task.attempt (\_ -> originMessage model.id NoOpAutocom) (Dom.focus model.id) )
PreviewMenuItem id ->
{ model | selectedMenuItem = Just <| getMenuItemAtId model.menuItems id } ! []
HandleEscape ->
let
validOptions =
not <| List.isEmpty (acceptableItems model.value model.menuItems)
handleEscape =
if validOptions then
model
|> removeSelection
|> resetMenu
else
model
|> resetInput
escapedModel =
case model.selectedMenuItem of
Just menuItem ->
if model.value == menuItem then
model
|> resetInput
else
handleEscape
Nothing ->
handleEscape
in
escapedModel ! []
Reset ->
{ model | state = Autocomplete.reset (updateConfig model.id originMessage) model.state, selectedMenuItem = Nothing }
! []
OnFocusAutocom ->
-- lucamug -
if model.preventingFocus then
{ model | preventingFocus = False } ! []
else
{ model | focus = True, showMenu = True } ! []
OnBlurAutocom ->
-- Closing the drop down on Blur
if model.preventingBlur then
{ model | preventingBlur = False } ! []
else
{ model | focus = False, showMenu = False } ! []
PreventFocusAndBlur ->
{ model | preventingFocus = True, preventingBlur = True } ! []
NoOpAutocom ->
model ! []
resetMenu : Model -> Model
resetMenu model =
{ model
| state = Autocomplete.empty
, showMenu = False
}
removeSelection : Model -> Model
removeSelection model =
{ model | selectedMenuItem = Nothing }
resetInput : Model -> Model
resetInput model =
{ model | value = "" }
|> removeSelection
|> resetMenu
getMenuItemAtId : List String -> String -> String
getMenuItemAtId menuItems id =
List.filter (\menuItem -> menuItem == id) menuItems
|> List.head
|> Maybe.withDefault ""
setQuery : Model -> String -> Model
setQuery model id =
{ model
| value = getMenuItemAtId model.menuItems id
, selectedMenuItem = Just <| getMenuItemAtId model.menuItems id
}
acceptableItems : String -> List String -> List String
acceptableItems value menuItems =
let
lowerQuery =
String.toLower value
in
List.filter (String.contains lowerQuery << String.toLower) menuItems
view : Model -> (String -> Msg -> msg) -> Html msg
view model originMessage =
-- originMessage = MsgAutocom
let
options =
{ preventDefault = True, stopPropagation = False }
dec =
Decode.map
(\code ->
if code == 38 || code == 40 then
Ok (originMessage model.id NoOpAutocom)
else if code == 27 then
Ok (originMessage model.id HandleEscape)
else
Err "not handling that key"
)
keyCode
|> Decode.andThen
fromResult
-- fromResult : Result String a -> Decode.Decoder a
fromResult result =
case result of
Ok val ->
Decode.succeed val
Err reason ->
Decode.fail reason
menu =
if model.showMenu then
[ viewMenu model originMessage ]
else
[]
fieldValue =
case model.selectedMenuItem of
Just menuItem ->
menuItem
Nothing ->
model.value
activeDescendant attributes =
case model.selectedMenuItem of
Just menuItem ->
attribute "aria-activedescendant"
menuItem
:: attributes
Nothing ->
attributes
in
label [ style [ ( "position", "relative" ) ] ]
(List.append
[ div
[ classList
[ ( "placeholder", True )
, ( "upperPosition", model.focus || fieldValue /= "" )
]
]
[ text model.name ]
, input
(activeDescendant
[ type_ "text"
, onInput (originMessage model.id << SetQuery)
, onFocus (originMessage model.id OnFocusAutocom)
, onBlur (originMessage model.id OnBlurAutocom)
, onWithOptions "keydown" options dec
, value fieldValue
, id model.id
, classList
[ ( "autocomplete-input", True )
, ( "autocomplete-open", model.showMenu )
]
, autocomplete False
, attribute "aria-owns" "list-of-presidents"
, attribute "aria-expanded" <| String.toLower <| toString model.showMenu
, attribute "aria-haspopup" <| String.toLower <| toString model.showMenu
, attribute "role" "combobox"
, attribute "aria-autocomplete" "list"
]
)
[]
]
menu
)
viewMenu : Model -> (String -> Msg -> msg) -> Html msg
viewMenu model originMessage =
-- This is the menu that appear below the input box
div [ class "autocomplete-menu", onMouseDown (originMessage model.id PreventFocusAndBlur) ]
[ Html.map (originMessage model.id << SetAutoState) (Autocomplete.view viewConfig model.howManyToShow model.state (acceptableItems model.value model.menuItems)) ]
viewConfig : Autocomplete.ViewConfig String
viewConfig =
let
customizedLi keySelected mouseSelected menuItem =
{ attributes =
[ classList [ ( "autocomplete-item", True ), ( "key-selected", keySelected || mouseSelected ) ]
, id menuItem
]
, children = [ Html.text menuItem ]
}
in
Autocomplete.viewConfig
{ toId = \id -> id
, ul = [ class "autocomplete-list" ]
, li = customizedLi
}
updateConfig : String -> (String -> Msg -> msg) -> Autocomplete.UpdateConfig msg String
updateConfig msgId originMessage =
Autocomplete.updateConfig
{ toId = \id -> id
, onKeyDown =
\code maybeId ->
if code == 38 || code == 40 then
Maybe.map (originMessage msgId << PreviewMenuItem) maybeId
else if code == 13 then
Maybe.map (originMessage msgId << SelectMenuItemKeyboard) maybeId
else
Just <| originMessage msgId Reset
, onTooLow = Just <| (originMessage msgId << Wrap) False
, onTooHigh = Just <| (originMessage msgId << Wrap) True
-- lucamug - Removed this to avoid the input field changing on mouse
-- over
-- , onMouseEnter = \id -> Just <| (MsgAutocom << PreviewMenuItem) id
, onMouseEnter = \_ -> Nothing
, onMouseLeave = \_ -> Nothing
, onMouseClick = \id -> Just <| (originMessage msgId << SelectMenuItemMouse) id
, separateSelections = False
}