examples/vcp_renderer.html

<html data-bs-theme="dark">

<head>
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/css/bootstrap.min.css" rel="stylesheet"
        integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">

</head>

<body>

    <div class="container">

        <label for="server-port" class="form-label">Server Port</label>
        <div class="input-group mb-3">
            <input type="text" class="form-control" aria-label="Port Number" value="8989" id="port">
            <button class="btn btn-primary" type="button" onclick="connect()">Connect</button>
        </div>

        <div class="row">
            <div class="col">
                <label for="volume_setting" class="form-label">Volume Setting</label>
                <input type="range" class="form-range" min="0" max="255" id="volume_setting">
            </div>
            <div class="col">
                <label for="change_counter" class="form-label">Change Counter</label>
                <input type="range" class="form-range" min="0" max="255" id="change_counter">
            </div>
            <div class="col">
                <div class="form-check form-switch">
                    <input class="form-check-input" type="checkbox" role="switch" id="muted">
                    <label class="form-check-label" for="muted">Muted</label>
                </div>
            </div>
        </div>

        <button class="btn btn-primary" type="button" onclick="update_state()">Notify New Volume State</button>


        <hr>
        <div id="socketStateContainer" class="bg-body-tertiary p-3 rounded-2">
            <h3>Log</h3>
            <code id="socketState">
            </code>
        </div>
    </div>

    <script>
        let portInput = document.getElementById("port")
        let volumeSetting = document.getElementById("volume_setting")
        let muted = document.getElementById("muted")
        let changeCounter = document.getElementById("change_counter")
        let socket = null

        function connect() {
            if (socket != null) {
                return
            }
            socket = new WebSocket(`ws://localhost:${portInput.value}`);
            socket.onopen = _ => {
                socketState.innerText += 'OPEN\n'
            }
            socket.onclose = _ => {
                socketState.innerText += 'CLOSED\n'
                socket = null
            }
            socket.onerror = (error) => {
                socketState.innerText += 'ERROR\n'
                console.log(`ERROR: ${error}`)
            }
            socket.onmessage = (event) => {
                socketState.innerText += `<- ${event.data}\n`
                let volume_state = JSON.parse(event.data)
                volumeSetting.value = volume_state.volume_setting
                changeCounter.value = volume_state.change_counter
                muted.checked = volume_state.muted ? true : false
            }
        }

        function send(message) {
            if (socket && socket.readyState == WebSocket.OPEN) {
                let jsonMessage = JSON.stringify(message)
                socketState.innerText += `-> ${jsonMessage}\n`
                socket.send(jsonMessage)
            } else {
                socketState.innerText += 'NOT CONNECTED\n'
            }
        }

        function update_state() {
            send({
                volume_setting: parseInt(volumeSetting.value),
                change_counter: parseInt(changeCounter.value),
                muted: muted.checked ? 1 : 0
            })
        }
    </script>
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.2/dist/js/bootstrap.bundle.min.js"
        integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL"
        crossorigin="anonymous"></script>

</body>

</html>