chuckh/paper-scroll-header-panel-demo.html

## paper-scroll-header-panel-demo.html
<!doctype html>
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<html>
<head>
  <title>paper-scroll-header-panel: demo4</title>

  <meta name="viewport" content="width=device-width, minimum-scale=1.0, initial-scale=1.0, user-scalable=yes">
  <meta name="mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-capable" content="yes">

  <script src="../../webcomponentsjs/webcomponents-lite.js"></script>

  <link rel="import" href="../paper-scroll-header-panel.html">
  <link rel="import" href="../../paper-toolbar/paper-toolbar.html">
  <link rel="import" href="../../iron-icons/iron-icons.html">
  <link rel="import" href="../../paper-icon-button/paper-icon-button.html">
  <link rel="import" href="sample-content.html">

  <link rel="stylesheet" href="../../paper-styles/demo.css">


  <style is="custom-style">

    paper-scroll-header-panel {
      position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0;
      background-color: var(--paper-grey-200, #eee);

      /* background for toolbar when it is at its full size */
      --paper-scroll-header-panel-full-header: {
        /*background-image: url(images/bg6.jpg);*/
        background-color: var(--paper-red-500);
      };

      /* background for toolbar when it is condensed */
      --paper-scroll-header-panel-condensed-header: {
        background-color: var(--paper-deep-orange-500, #ff5722);
      };
    }

    paper-toolbar.tall {
      background-color: transparent;
    }

    paper-toolbar.tall .title {
      font-size: 40px;
      margin-left: 60px;

      -webkit-transform-origin: left center;
      transform-origin: left center;

      /* Issue #15 */
      isolation: isolate;
    }

    paper-toolbar.tall iron-icon {
      margin: 0 8px;
    }

    .content {
      padding: 8px;
    }

    .bottom {
      padding-left: 62px;
    }

  </style>

</head>
<body>

  <paper-scroll-header-panel keep-condensed-header>

    <paper-toolbar class="tall">

      <paper-icon-button icon="arrow-back"></paper-icon-button>
      <div class="flex"></div>
      <paper-icon-button icon="search"></paper-icon-button>
      <paper-icon-button icon="more-vert"></paper-icon-button>
      <div class="middle title">Middle Title</div>
      <div class="bottom">Bottom Sub title</div>

    </paper-toolbar>

    <div class="content">

      <sample-content size="100"></sample-content>

    </div>

  </paper-scroll-header-panel>

  <script>

    // custom transformation: scale header's title
    var title = document.querySelector('.title');
    addEventListener('paper-header-transform', function(e) {
      var d = e.detail;
      var m = d.height - d.condensedHeight;
      var scale = Math.max(0.75, (m - d.y) / (m / 0.25)  + 0.75);

      Polymer.Base.transform('scale(' + scale + ') translateZ(0)', title);
    });

  </script>

</body>
</html>