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  <!--
  @license
  Copyright (c) 2015 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="../../polymer/polymer.html">
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  <link rel="import" href="../../paper-styles/color.html">
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  <link rel="import" href="../iron-a11y-keys-behavior.html">
  
  <dom-module id="x-key-aware">
    <style>
      :host {
        display: block;
        position: relative;
      }
  
      pre {
        color: var(--google-blue-700);
      }
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      .keys {
        line-height: 25px;
      }
  
      .keys span {
        cursor: default;
        background-color: var(--google-grey-100);
        border: 1px solid var(--google-grey-300);
        padding: 1px 5px;
        border-radius: 5px;
      }
    </style>
    <template>
      <h4>Press any of these keys</h4>
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      <input type="checkbox" checked="{{preventDefault::change}}"> prevent default = {{preventDefault}}
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      <p class="keys">
        <template is="dom-repeat" items="[[boundKeys]]">
          <span>{{item}}</span>
        </template>
      </p>
      <pre>[[pressed]]</pre>
    </template>
  </dom-module>
  
  <script>
    Polymer({
      is: 'x-key-aware',
  
      behaviors: [
        Polymer.IronA11yKeysBehavior
      ],
  
      properties: {
        pressed: {
          type: String,
          readOnly: true,
          value: ''
        },
  
        boundKeys: {
          type: Array,
          value: function() {
            return Object.keys(this.keyBindings).join(' ').split(' ');
          }
        },
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        preventDefault: {
          type: Boolean,
          value: true,
          notify: true
        },
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        keyEventTarget: {
          type: Object,
          value: function() {
            return document.body;
          }
        }
      },
  
      keyBindings: {
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        '* pageup pagedown left right down up home end space enter @ ~ " $ ? ! \\ + : # backspace': '_updatePressed',
        'a': '_updatePressed',
        'shift+a alt+a': '_updatePressed',
        'shift+tab shift+space': '_updatePressed'
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      },
  
      _updatePressed: function(event) {
        console.log(event.detail);
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        if (this.preventDefault) {
          event.preventDefault();
        }
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        this._setPressed(
          this.pressed + event.detail.combo + ' pressed!\n'
        );
      }
    });
  </script>