Update CSS.

Unless you specifically need the Sync data, this will be more useful,
since it stores the messages being sent and the like.

src/Main.elm

@@ -2,6 +2,8 @@ import Browser exposing (application, UrlRequest(..))
 import Browser.Navigation as Nav
 import Browser.Dom exposing (Viewport, setViewportOf)
 import Scylla.Sync exposing (..)
+import Scylla.Room exposing (..)
+import Scylla.Messages exposing (..)
 import Scylla.Login exposing (..)
 import Scylla.Api exposing (..)
 import Scylla.Model exposing (..)
@@ -78,7 +80,7 @@ update msg model = case msg of
     ReceiveUserData s r -> updateUserData model s r
     ChangeRoomText r t -> updateChangeRoomText model r t
     SendRoomText r -> updateSendRoomText model r
-    SendRoomTextResponse r -> (model, Cmd.none)
+    SendRoomTextResponse t r -> ({ model | sending = Dict.remove t model.sending }, Cmd.none)
     ReceiveCompletedReadMarker r -> (model, Cmd.none)
     ReceiveCompletedTypingIndicator r -> (model, Cmd.none)
     ReceiveStoreData d -> updateStoreData model d
@@ -107,8 +109,12 @@ updateMarkdown m { roomId, text, markdown } =
             <| encodeLoginInfo
             <| LoginInfo (Maybe.withDefault "" m.token) m.apiUrl m.loginUsername (m.transactionId + 1))
         sendMessageCmd = sendMarkdownMessage m.apiUrl (Maybe.withDefault "" m.token) (m.transactionId + 1) roomId text markdown
+        newModel =
+            { m | transactionId = m.transactionId + 1
+            , sending = Dict.insert (m.transactionId + 1) (roomId, TextMessage text) m.sending
+            }
     in
-        ({ m | transactionId = m.transactionId + 1 }, Cmd.batch [ storeValueCmd, sendMessageCmd ])
+        (newModel, Cmd.batch [ storeValueCmd, sendMessageCmd ])
 
 updateFileUploadComplete : Model -> RoomId -> File -> (Result Http.Error String) -> (Model, Cmd Msg)
 updateFileUploadComplete m rid mime ur =
@@ -230,7 +236,7 @@ updateViewportAfterMessage : Model -> Result Browser.Dom.Error Viewport -> (Mode
 updateViewportAfterMessage m vr = 
     let
         cmd vp = if vp.scene.height - (vp.viewport.y + vp.viewport.height ) < 100
-            then Task.attempt ViewportChangeComplete <| setViewportOf "events-wrapper" vp.viewport.x vp.scene.height
+            then Task.attempt ViewportChangeComplete <| setViewportOf "messages-wrapper" vp.viewport.x vp.scene.height
             else Cmd.none
     in
         (m, Result.withDefault Cmd.none <| Result.map cmd vr)
@@ -308,7 +314,7 @@ updateSyncResponse model r notify =
         setScrollCmd sr = if List.isEmpty 
             <| roomMessages sr
                 then Cmd.none
-                else Task.attempt ViewportAfterMessage (Browser.Dom.getViewportOf "events-wrapper")
+                else Task.attempt ViewportAfterMessage (Browser.Dom.getViewportOf "messages-wrapper")
         setReadReceiptCmd sr = case (room, List.head <| List.reverse <| roomMessages sr) of
             (Just rid, Just re) -> setReadMarkers model.apiUrl token rid re.eventId <| Just re.eventId
             _ -> Cmd.none

src/Scylla/Http.elm

@@ -90,7 +90,7 @@ sendMessage apiUrl token transactionId room msg contents = request
     }
 
 sendMarkdownMessage : ApiUrl -> ApiToken -> Int -> RoomId -> String -> String -> Cmd Msg
-sendMarkdownMessage apiUrl token transactionId room message md = sendMessage apiUrl token transactionId room SendRoomTextResponse
+sendMarkdownMessage apiUrl token transactionId room message md = sendMessage apiUrl token transactionId room (SendRoomTextResponse transactionId)
     [ ("msgtype", string "m.text")
     , ("body", string message)
     , ("formatted_body", string md)
@@ -98,7 +98,7 @@ sendMarkdownMessage apiUrl token transactionId room message md = sendMessage api
     ]
 
 sendTextMessage : ApiUrl -> ApiToken -> Int -> RoomId -> String -> Cmd Msg
-sendTextMessage apiUrl token transactionId room message = sendMessage apiUrl token transactionId room SendRoomTextResponse
+sendTextMessage apiUrl token transactionId room message = sendMessage apiUrl token transactionId room (SendRoomTextResponse transactionId)
     [ ("msgtype", string "m.text")
     , ("body", string message)
     ]

src/Scylla/Messages.elm

@@ -0,0 +1,30 @@
+module Scylla.Messages exposing (..)
+import Scylla.Sync exposing (RoomEvent)
+import Scylla.Login exposing (Username)
+
+type SendingMessage = TextMessage String
+
+type Message =
+    Sending SendingMessage
+    | Received RoomEvent
+
+messageUsername : Username -> Message -> Username
+messageUsername u msg = case msg of
+    Sending _ -> u
+    Received re -> re.sender
+
+mergeMessages : Username -> List Message -> List (Username, List Message)
+mergeMessages du xs =
+    let
+        initialState = (Nothing, [], [])
+        appendNamed mu ms msl = case mu of
+            Just u -> msl ++ [(u, ms)]
+            Nothing -> msl
+        foldFunction msg (pu, ms, msl) =
+            let
+                nu = Just <| messageUsername du msg
+            in
+                if pu == nu then (pu, ms ++ [msg], msl) else (nu, [msg], appendNamed pu ms msl)
+        (fmu, fms, fmsl) = List.foldl foldFunction initialState xs
+    in
+        appendNamed fmu fms fmsl

src/Scylla/Model.elm

@@ -4,6 +4,7 @@ import Scylla.Sync exposing (SyncResponse, HistoryResponse, JoinedRoom, senderNa
 import Scylla.Login exposing (LoginResponse, Username, Password)
 import Scylla.UserData exposing (UserData)
 import Scylla.Route exposing (Route(..), RoomId)
+import Scylla.Messages exposing (..)
 import Scylla.Storage exposing (..)
 import Scylla.Markdown exposing (..)
 import Browser.Navigation as Nav
@@ -26,7 +27,8 @@ type alias Model =
     , apiUrl : ApiUrl
     , sync : SyncResponse
     , errors : List String
-    , roomText : Dict String String
+    , roomText : Dict RoomId String
+    , sending : Dict Int (RoomId, SendingMessage)
     , transactionId : Int
     , userData : Dict Username UserData
     , connected : Bool
@@ -42,7 +44,7 @@ type Msg =
     | ChangeRoute Route -- URL changes
     | ChangeRoomText String String -- Change to a room's input text
     | SendRoomText String -- Sends a message typed into a given room's input
-    | SendRoomTextResponse (Result Http.Error ()) -- A send message response finished
+    | SendRoomTextResponse Int (Result Http.Error ()) -- A send message response finished
     | ViewportAfterMessage (Result Browser.Dom.Error Viewport) -- A message has been received, try scroll (maybe)
     | ViewportChangeComplete (Result Browser.Dom.Error ()) -- We're done changing the viewport.
     | ReceiveFirstSyncResponse (Result Http.Error SyncResponse) -- HTTP, Sync has finished
@@ -79,12 +81,12 @@ loginUrl = Url.Builder.absolute [ "login" ] []
 newUsers : Model -> List Username -> List Username
 newUsers m lus = List.filter (\u -> not <| Dict.member u m.userData) lus
 
+joinedRooms : Model -> Dict RoomId JoinedRoom
+joinedRooms m = Maybe.withDefault Dict.empty <| Maybe.andThen .join <| m.sync.rooms
+
 currentRoom : Model -> Maybe JoinedRoom
 currentRoom m =
-    let
-        roomDict = Maybe.withDefault Dict.empty <| Maybe.andThen .join <| m.sync.rooms
-    in
-        Maybe.andThen (\s -> Dict.get s roomDict) <| currentRoomId m
+    Maybe.andThen (\s -> Dict.get s <| joinedRooms m) <| currentRoomId m
 
 currentRoomId : Model -> Maybe RoomId
 currentRoomId m = case m.route of

src/Scylla/Room.elm

@@ -0,0 +1,37 @@
+module Scylla.Room exposing (..)
+import Scylla.Model exposing (..)
+import Scylla.Sync exposing (..)
+import Scylla.Messages exposing (..)
+import Scylla.Route exposing (..)
+import Dict
+
+type alias RoomData =
+    { joinedRoom : JoinedRoom
+    , sendingMessages : List (SendingMessage, Int)
+    , inputText : Maybe String
+    }
+
+roomData : Model -> RoomId -> Maybe RoomData
+roomData m rid =
+    case Dict.get rid (joinedRooms m) of
+        Just jr -> Just
+            { joinedRoom = jr
+            , sendingMessages = List.map (\(tid, (_, sm)) -> (sm, tid)) <| List.filter (\(_, (nrid, _)) -> nrid == rid) <| Dict.toList m.sending
+            , inputText = Dict.get rid m.roomText
+            }
+        Nothing -> Nothing
+
+currentRoomData : Model -> Maybe RoomData
+currentRoomData m = Maybe.andThen (roomData m) <| currentRoomId m
+
+extractMessageEvents : List RoomEvent -> List Message
+extractMessageEvents es = List.map Received
+    <| List.filter (\e -> e.type_ == "m.room.message") es
+
+extractMessages : RoomData -> List Message
+extractMessages rd =
+    let
+        eventMessages = extractMessageEvents <| Maybe.withDefault [] <| Maybe.andThen .events rd.joinedRoom.timeline
+        sendingMessages = List.map (\(sm, i) -> Sending sm) rd.sendingMessages
+    in
+        eventMessages ++ sendingMessages

src/Scylla/Views.elm

@@ -3,6 +3,8 @@ import Scylla.Model exposing (..)
 import Scylla.Sync exposing (..)
 import Scylla.Route exposing (..)
 import Scylla.Fnv as Fnv
+import Scylla.Room exposing (..)
+import Scylla.Messages exposing (..)
 import Scylla.Login exposing (Username)
 import Scylla.Http exposing (fullMediaUrl)
 import Scylla.Api exposing (ApiUrl)
@@ -12,7 +14,7 @@ import Svg
 import Svg.Attributes
 import Url.Builder
 import Json.Decode as Decode
-import Html exposing (Html, Attribute, div, input, text, button, div, span, a, h2, h3, table, td, tr, img, textarea, video, source)
+import Html exposing (Html, Attribute, div, input, text, button, div, span, a, h2, h3, table, td, tr, img, textarea, video, source, p)
 import Html.Attributes exposing (type_, value, href, class, style, src, id, rows, controls, src)
 import Html.Events exposing (onInput, onClick, preventDefaultOn)
 import Dict exposing (Dict)
@@ -41,9 +43,8 @@ stringColor s =
 viewFull : Model -> List (Html Msg)
 viewFull model = 
     let
-        room r = Maybe.map (\jr -> (r, jr))
-            <| Maybe.andThen (Dict.get r)
-            <| Maybe.andThen .join model.sync.rooms
+        room r = Maybe.map (\rd -> (r, rd))
+            <| roomData model r
         core = case model.route of
             Login -> loginView model 
             Base -> baseView model Nothing
@@ -59,7 +60,7 @@ errorsView = div [ class "errors-wrapper" ] << List.indexedMap errorView
 errorView : Int -> String -> Html Msg
 errorView i s = div [ class "error-wrapper", onClick <| DismissError i ] [ iconView "alert-triangle", text s ]
 
-baseView : Model -> Maybe (String, JoinedRoom) -> Html Msg
+baseView : Model -> Maybe (String, RoomData) -> Html Msg
 baseView m jr = 
     let
         roomView = Maybe.map (\(id, r) -> joinedRoomView m id r) jr
@@ -136,13 +137,12 @@ loginView m = div [ class "login-wrapper" ]
     , button [ onClick AttemptLogin ] [ text "Log In" ]
     ]
 
-joinedRoomView : Model -> RoomId -> JoinedRoom -> Html Msg
-joinedRoomView m roomId jr =
+joinedRoomView : Model -> RoomId -> RoomData -> Html Msg
+joinedRoomView m roomId rd =
     let
-        events = Maybe.withDefault [] <| Maybe.andThen .events jr.timeline
-        renderedEvents = List.filterMap (eventView m) events
-        eventWrapper = eventWrapperView m roomId renderedEvents
-        typing = List.map (displayName m) <| roomTypingUsers jr
+        renderedMessages = List.map (userMessagesView m) <| mergeMessages m.loginUsername <| extractMessages rd
+        messagesWrapper = messagesWrapperView m roomId renderedMessages
+        typing = List.map (displayName m) <| roomTypingUsers rd.joinedRoom
         typingText = String.join ", " typing
         typingSuffix = case List.length typing of
             0 -> ""
@@ -162,8 +162,8 @@ joinedRoomView m roomId jr =
             ]
     in
         div [ class "room-wrapper" ]
-            [ h2 [] [ text <| Maybe.withDefault "<No Name>" <| roomName jr ]
-            , eventWrapper
+            [ h2 [] [ text <| Maybe.withDefault "<No Name>" <| roomName rd.joinedRoom ]
+            , messagesWrapper
             , typingWrapper
             , messageInput
             ]
@@ -187,58 +187,62 @@ iconView name =
             [ Svg.Attributes.class "feather-icon"
             ] [ Svg.use [ Svg.Attributes.xlinkHref (url ++ "#" ++ name) ] [] ]
 
-eventWrapperView : Model -> RoomId -> List (Html Msg) -> Html Msg
-eventWrapperView m rid es = div [ class "events-wrapper", id "events-wrapper" ]
+messagesWrapperView : Model -> RoomId -> List (Html Msg) -> Html Msg
+messagesWrapperView m rid es = div [ class "messages-wrapper", id "messages-wrapper" ]
     [ a [ class "history-link", onClick <| History rid ] [ text "Load older messages" ]
-    , table [ class "events-table" ] es
+    , table [ class "messages-table" ] es
     ]
 
-eventView : Model -> RoomEvent -> Maybe (Html Msg)
-eventView m re = 
+senderView : Model -> Username -> Html Msg
+senderView m s =
+    span [ style "color" <| stringColor s, class "sender-wrapper" ] [ text <| displayName m s ]
+
+userMessagesView : Model -> (Username, List Message) -> Html Msg
+userMessagesView m (u, ms) = 
     let
-        viewFunction = case re.type_ of
-            "m.room.message" -> Just messageView
-            _ -> Nothing
-        createRow mhtml = tr []
-            [ td [] [ eventSenderView m re.sender ]
-            , td [] [ mhtml ]
-            ]
+        wrap h = div [ class "message" ] [ h ]
     in
-        Maybe.map createRow
-            <| Maybe.andThen (\f -> f m re) viewFunction
+        tr []
+            [ td [] [ senderView m u ]
+            , td [] <| List.map wrap <| List.filterMap (messageView m) ms
+            ]
 
-eventSenderView : Model -> Username -> Html Msg
-eventSenderView m s =
-    span [ style "background-color" <| stringColor s, class "sender-wrapper" ] [ text <| displayName m s ]
+messageView : Model -> Message -> Maybe (Html Msg)
+messageView m msg = case msg of
+    Sending t -> Just <| sendingMessageView m t
+    Received re -> roomEventView m re
 
-messageView : Model -> RoomEvent -> Maybe (Html Msg)
-messageView m re =
+sendingMessageView : Model -> SendingMessage -> Html Msg
+sendingMessageView m msg = case msg of
+    TextMessage t -> text t
+
+roomEventView : Model -> RoomEvent -> Maybe (Html Msg)
+roomEventView m re =
     let
         msgtype = Decode.decodeValue (Decode.field "msgtype" Decode.string) re.content
     in
         case msgtype of
-            Ok "m.text" -> messageTextView m re
-            Ok "m.image" -> messageImageView m re
-            Ok "m.file" -> messageFileView m re
-            Ok "m.video" -> messageVideoView m re
+            Ok "m.text" -> roomEventTextView m re
+            Ok "m.image" -> roomEventImageView m re
+            Ok "m.file" -> roomEventFileView m re
+            Ok "m.video" -> roomEventVideoView m re
             _ -> Nothing
 
-messageTextView : Model -> RoomEvent -> Maybe (Html Msg)
-messageTextView m re =
+roomEventTextView : Model -> RoomEvent -> Maybe (Html Msg)
+roomEventTextView m re =
     let
         body = Decode.decodeValue (Decode.field "body" Decode.string) re.content
         customHtml = Maybe.map Html.Parser.Util.toVirtualDom
             <| Maybe.andThen (Result.toMaybe << Html.Parser.run )
             <| Result.toMaybe
             <| Decode.decodeValue (Decode.field "formatted_body" Decode.string) re.content
-        wrap mtext = span [] [ text mtext ]
     in
         case customHtml of
-            Just c -> Just <| div [ class "markdown-wrapper" ] c
-            Nothing -> Maybe.map wrap <| Result.toMaybe body
+            Just c -> Just <| div [] c
+            Nothing -> Maybe.map (p [] << List.singleton << text) <| Result.toMaybe body
 
-messageImageView : Model -> RoomEvent -> Maybe (Html Msg)
-messageImageView m re =
+roomEventImageView : Model -> RoomEvent -> Maybe (Html Msg)
+roomEventImageView m re =
     let
         body = Decode.decodeValue (Decode.field "url" Decode.string) re.content
     in
@@ -246,8 +250,8 @@ messageImageView m re =
             <| Maybe.map (contentRepositoryDownloadUrl m.apiUrl)
             <| Result.toMaybe body
 
-messageFileView : Model -> RoomEvent -> Maybe (Html Msg)
-messageFileView m re =
+roomEventFileView : Model -> RoomEvent -> Maybe (Html Msg)
+roomEventFileView m re =
     let
         decoder = Decode.map2 (\l r -> (l, r)) (Decode.field "url" Decode.string) (Decode.field "body" Decode.string)
         fileData = Decode.decodeValue decoder re.content
@@ -256,8 +260,8 @@ messageFileView m re =
         <| Maybe.map (\(url, name) -> (contentRepositoryDownloadUrl m.apiUrl url, name))
         <| Result.toMaybe fileData
 
-messageVideoView : Model -> RoomEvent -> Maybe (Html Msg)
-messageVideoView m re =
+roomEventVideoView : Model -> RoomEvent -> Maybe (Html Msg)
+roomEventVideoView m re =
     let
         decoder = Decode.map2 (\l r -> (l, r))
             (Decode.field "url" Decode.string)

static/scss/style.scss

@@ -4,6 +4,7 @@ $primary-color-highlight: #4298C7;
 $primary-color-light: #9FDBFB;
 
 $background-color: #1b1e21;
+$background-color-light: lighten($background-color, 4%);
 $background-color-dark: darken($background-color, 4%);
 
 $error-color: #f01d43;
@@ -16,6 +17,8 @@ $inactive-input-border-color: darken($inactive-input-color, 10%);
 
 $transition-duration: .125s;
 
+$inset-shadow: inset 0px 0px 5px rgba(0, 0, 0, .25);
+
 html, body {
     height: 100vh;
 }
@@ -77,6 +80,7 @@ h2, h3 {
 }
 
 a.file-wrapper {
+    padding: 5px 0px 5px 0px;
     display: flex;
     align-items: center;
 
@@ -141,7 +145,7 @@ div.base-wrapper {
     height: 100%;
 
     > div {
-        padding: 5px;
+        padding: 10px;
         box-sizing: border-box;
     }
 }
@@ -151,6 +155,7 @@ div.base-wrapper {
  */
 div.rooms-wrapper {
     flex-shrink: 0;
+    background-color: $background-color-light;
 }
 
 div.room-link-wrapper {
@@ -186,6 +191,8 @@ div.room-wrapper {
     display: flex;
     height: 100%;
     flex-direction: column;  
+    box-shadow: $inset-shadow;
+    padding: 5px;
 }
 
 div.typing-wrapper {
@@ -212,7 +219,7 @@ div.message-wrapper {
     }
 }
 
-div.events-wrapper {
+div.messages-wrapper {
     overflow-y: scroll;
     flex-grow: 1;
 
@@ -225,7 +232,7 @@ div.events-wrapper {
     }
 }
 
-table.events-table {
+table.messages-table {
     border-collapse: collapse;
     width: 100%;
     table-layout: fixed;
@@ -252,13 +259,9 @@ table.events-table {
         }
         white-space: nowrap;
     }
-
-    tr:nth-child(2n) {
-        background-color: $background-color-dark;
-    }
 }
 
-div.markdown-wrapper {
+div.message {
     p {
         margin: 0px;
     }
@@ -281,7 +284,7 @@ div.markdown-wrapper {
         padding: 10px;
         background-color: $background-color;
         border-radius: 3px;
-        box-shadow: inset 0px 0px 5px rgba(0, 0, 0, .15);
+        box-shadow: $inset-shadow;
     }
 }
 
@@ -291,7 +294,8 @@ span.sender-wrapper {
     padding-right: 5px;
     display: inline-block;
     box-sizing: border-box;
-    text-align: center;
+    text-align: right;
+    font-weight: 800;
     width: 100%;
     text-overflow: ellipsis;
     overflow: hidden;