packager/index.html

<html>
  <head>
    <meta charset="utf8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <title>Scaffolding Demo</title>
    <style>
      body {
        background-color: black;
        color: white;
        font-family: sans-serif;
        overflow: hidden;
      }
      [hidden] {
        display: none !important;
      }
      h1 {
        font-weight: normal;
      }
      a {
        color: inherit;
        text-decoration: underline;
        cursor: pointer;
      }

      #app, #loading, #error, #launch {
        position: absolute;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
      }
      .screen {
        display: flex;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        text-align: center;
        cursor: default;
        user-select: none;
        background-color: black;
      }
      #launch {
        background-color: rgba(0, 0, 0, 0.7);
        cursor: pointer;
      }
      .green-flag {
        width: 80px;
        height: 80px;
        padding: 16px;
        border-radius: 100%;
        background: rgba(255,255,255,0.75);
        border: 3px solid hsla(0, 100%, 100%, 1);
        display: flex;
        justify-content: center;
        align-items: center;
        box-sizing: border-box;
      }
      .progress-bar-outer {
        border: 1px solid currentColor;
        height: 10px;
        width: 200px;
        max-width: 200px;
      }
      .progress-bar-inner {
        height: 100%;
        width: 0;
        background-color: currentColor;
      }
    </style>
  </head>
  <body>
    <noscript>Enable JavaScript</noscript>

    <div id="app"></div>

    <div id="launch" class="screen" hidden title="Click to start" tabindex="0">
      <div class="green-flag">
        <svg viewBox="0 0 16.63 17.5">
          <defs><style>.cls-1,.cls-2{fill:#4cbf56;stroke:#45993d;stroke-linecap:round;stroke-linejoin:round;}.cls-2{stroke-width:1.5px;}</style></defs>
          <path class="cls-1" d="M.75,2A6.44,6.44,0,0,1,8.44,2h0a6.44,6.44,0,0,0,7.69,0V12.4a6.44,6.44,0,0,1-7.69,0h0a6.44,6.44,0,0,0-7.69,0"/>
          <line class="cls-2" x1="0.75" y1="16.75" x2="0.75" y2="0.75"/>
        </svg>
      </div>
    </div>

    <div id="loading" class="screen">
      <div class="progress-bar-outer"><div class="progress-bar-inner" id="loading-inner"></div></div>
    </div>

    <div id="error" class="screen" hidden>
      <h1>Error</h1>
      <p>See console for more information</p>
    </div>

    <script src="dist/index.js"></script>
    <script src="dist/addons.js"></script>
    <script>
      const appElement = document.getElementById('app');
      const launchScreen = document.getElementById('launch');
      const loadingScreen = document.getElementById('loading');
      const loadingInner = document.getElementById('loading-inner');
      const errorScreen = document.getElementById('error');

      const scaffolding = new Scaffolding.Scaffolding();
      scaffolding.setup();
      scaffolding.appendTo(appElement);

      ScaffoldingAddons.run(scaffolding);

      const {storage, vm} = scaffolding;
      storage.addWebStore(
        [storage.AssetType.Project],
        (asset) => `https://projects.scratch.mit.edu/${asset.assetId}`
      );
      storage.addWebStore(
        [storage.AssetType.ImageVector, storage.AssetType.ImageBitmap, storage.AssetType.Sound],
        (asset) => `https://assets.scratch.mit.edu/internalapi/asset/${asset.assetId}.${asset.dataFormat}/get/`
      );
      const setProgress = (progress) => {
        loadingInner.style.width = `${progress * 100}%`;
      }
      storage.onprogress = (total, loaded) => {
        setProgress(0.2 + (loaded / total) * 0.8)
      };
      setProgress(0.1);

      const getProjectJSON = async () => {
        const PROJECT_ID = '413072152';
        const asset = await storage.load(Scaffolding.Storage.AssetType.Project, PROJECT_ID);
        return asset.data;
      };

      const run = async () => {
        const projectJSON = await getProjectJSON();
        setProgress(0.1);
        await scaffolding.loadProject(projectJSON);
        setProgress(1);
        loadingScreen.hidden = true;
        launchScreen.hidden = false;
        launchScreen.addEventListener('click', () => {
          launchScreen.hidden = true;
          scaffolding.start();
        });
        launchScreen.focus();
      };

      const handleError = (error) => {
        console.error(error);
        errorScreen.hidden = false;  
      };

      run().catch(handleError);
    </script>
  </body>
</html>