51 lines
1.4 KiB
Elm
51 lines
1.4 KiB
Elm
module Update.Viewer exposing (getPrevNext, update)
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import List.Extra exposing (elemIndex, getAt)
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import Mastodon.Model exposing (..)
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import Types exposing (..)
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getPrevNext : Viewer -> ( Maybe Attachment, Maybe Attachment )
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getPrevNext { attachments, attachment } =
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let
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index =
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Maybe.withDefault -1 <| elemIndex attachment attachments
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in
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( getAt (index - 1) attachments, getAt (index + 1) attachments )
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update : ViewerMsg -> Maybe Viewer -> ( Maybe Viewer, Cmd Msg )
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update viewerMsg viewer =
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case viewerMsg of
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CloseViewer ->
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Nothing ! []
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OpenViewer attachments attachment ->
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(Just <| Viewer attachments attachment) ! []
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PrevAttachment ->
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case viewer of
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Just viewer ->
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case getPrevNext viewer of
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( Just prev, _ ) ->
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(Just <| Viewer viewer.attachments prev) ! []
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_ ->
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Just viewer ! []
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Nothing ->
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viewer ! []
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NextAttachment ->
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case viewer of
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Just viewer ->
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case getPrevNext viewer of
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( _, Just next ) ->
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(Just <| Viewer viewer.attachments next) ! []
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_ ->
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Just viewer ! []
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Nothing ->
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viewer ! []
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