waffle/frontend/src/components/pages/main/ChannelView.svelte

<script>
    import { HashIcon } from "svelte-feather-icons";
    import request from "../../../request";
    import { apiRoute } from "../../../storage";
    import { messagesStoreProvider, userInfoStore } from "../../../stores";
    import Messages from "./Messages.svelte";

    export let channel;
    let messageInput = "";

    $: messages = messagesStoreProvider.getStore(channel.id);

    const onKeydown = async (e) => {
        if (e.code !== "Enter")
            return;

        if (messageInput.trim() === "" || !$userInfoStore)
            return;

        // optimistically add message to store
        const optimisticMessageId = Math.floor(Math.random() * 999999);
        const optimisticMessage = {
            id: optimisticMessageId,
            content: messageInput,
            channel_id: channel.id,
            author_id: $userInfoStore.id,
            author_username: $userInfoStore.username,
            createdAt: Date.now().toString()
        };
        messages.addMessage(optimisticMessage);
        messageInput = "";

        const res = await request("POST", apiRoute(`channels/${channel.id}/messages`), true, {
            content: optimisticMessage.content
        });
        
        if (res.success && res.ok) {
            messages.updateId(optimisticMessageId, res.json.id);
        } else {
            messages.deleteMessage({
                id: optimisticMessageId
            });
        }
    };
</script>

<style>
    .main-container {
        display: flex;
        flex-direction: column;
        width: 100%;
        height: 100%;
    }

    .top-bar {
        height: 3.4em;
        width: 100%;
        padding: var(--space-xs);
        background-color: var(--background-color-1);
        display: flex;
        align-items: center;
        border-bottom: 1px solid var(--background-color-2);
    }

    .channel-heading {
        margin-left: var(--space-xxs);
    }

    .message-input-container {
        width: 100%;
        padding: var(--space-md);
        background-color: var(--background-color-1);
    }

    .message-input {
        height: 3em;
        width: 100%;
        background-color : var(--background-color-2);
        border: none;
        color: currentColor;
        border-radius: var(--radius-md);
        padding: var(--space-sm);
    }
</style>

<div class="main-container">
    <div class="top-bar">
        <HashIcon />
        <span class="h5 channel-heading">{ channel.name }</span>
    </div>
    <Messages channelId="{ channel.id }" />
    <div class="message-input-container">
        <input type="text" class="message-input" on:keydown={ onKeydown } bind:value={ messageInput }>
    </div>
</div>