gistfile1.html

<!--
    @license
    Copyright (c) 2014 The Polymer Project Authors. All rights reserved.
    This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
    The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
    The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS.txt
    Code distributed by Google as part of the polymer project is also
    subject to an additional IP rights grant found at http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../components/polymer/polymer.html">
<link rel="import" href="../components/core-menu/core-menu.html">
<link rel="import" href="../components/core-item/core-item.html">

<polymer-element name="dropdown-panel" attributes="open ajaxify">
  <template>
    <style>
    :host {
      background: white;
      opacity: 0;
      visibility: hidden;
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
      /* -webkit-transform: translate3d(0, -6px, 0);
      -webkit-transition: .04s .08s -webkit-transform, 0.025s .1s opacity;
      -moz-transform: translate3d(0, -6px, 0);
      -moz-transition: .04s .08s -moz-transform, 0.025s .1s opacity;
      transform: translate3d(0, -6px, 0);
      transition: .04s .08s transform, 0.025s .1s opacity; */
    }

    :host([open]) {
      opacity: 1;
      visibility: visible;
      /* -webkit-transform: translate3d(0, 0, 0);
      -webkit-transition: .04s -webkit-transform, 0.025s opacity;
      -moz-transform: translate3d(0, -6px, 0);
      -moz-transition: .04s .08s -moz-transform, 0.025s .1s opacity;
      transform: translate3d(0, 0, 0);
      transition: .04s transform, 0.025s opacity; */
    }

    polyfill-next-selector { content: ':host core-item #label'; }
    ::content core-item /deep/ #label {
      font-weight: 300;
    }

    polyfill-next-selector { content: ':host core-item core-icon'; }
    ::content core-item::shadow core-icon {
      background-size: 48px !important;
    }

    polyfill-next-selector { content: ':host core-item[active]'; }
    ::content core-item[active] {
      background: rgba(0, 0, 0, 0.04);
      border: 1px solid #d9d9d9;
    }

    :host /deep/ core-icon {
      margin-right: 6px;
      background-size: 48px !important;
    }

    polyfill-next-selector { content: ':host core-item'; }
    ::content core-item {
      font-size: 14px !important;
      font-weight: 500;
      line-height: 32px !important;
      // letter-spacing: 0.01em;
      padding: 0;
      color: initial;
      opacity: 0.5;
    }

    polyfill-next-selector { content: ':host core-item:hover'; }
    ::content core-item:hover {
      opacity: 0.9;
    }

    polyfill-next-selector { content: ':host core-item.core-selected'; }
    ::content core-item.core-selected {
      opacity: 1;
    }

    </style>
    <core-menu id="mainmenu" on-click="{{onClick}}">
      <content></content>
    </core-menu>
  </template>
  <script>
  Polymer({
    publish: {
      open: {value: false, reflect: true}
    },
    ajaxify: false,
    attached: function() {
      var active = this.querySelector('core-item[active]');
      var index = Array.prototype.indexOf.call(this.children, active);
      this.$.mainmenu.selected = index;
    },
    openPanel: function() {
      this.open = true;

      var close = function() {
        this.open = false;
        document.body.removeEventListener('click', close, true);
      }.bind(this);

      document.body.addEventListener('click', close, true);
    }
  });
  </script>
</polymer-element>