WebCompDev / COMPONENTS

  <!--
  @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
  The complete set of authors may be found at http://polymer.github.io/AUTHORS
  The complete set of contributors may be found at http://polymer.github.io/CONTRIBUTORS
  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
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  <link rel="import" href="../polymer/polymer.html">
  <link rel="import" href="../paper-material/paper-material.html">
  <link rel="import" href="../paper-ripple/paper-ripple.html">
  <link rel="import" href="../paper-behaviors/paper-button-behavior.html">

  <link rel="import" href="../iron-flex-layout/iron-flex-layout.html">

  
  <!--
  
  Material Design: <a href="http://www.google.com/design/spec/components/buttons.html">Buttons</a>
  
  `paper-button` is a button. When the user touches the button, a ripple effect emanates
  from the point of contact. It may be flat or raised. A raised button is styled with a
  shadow.
  
  Example:
  

      <paper-button>Flat button</paper-button>
      <paper-button raised>Raised button</paper-button>

      <paper-button noink>No ripple effect</paper-button>

      <paper-button toggles>Toggle-able button</paper-button>

  
  A button that has `toggles` true will remain `active` after being clicked (and
  will have an `active` attribute set). For more information, see the `Polymer.IronButtonState`
  behavior.
  
  You may use custom DOM in the button body to create a variety of buttons. For example, to
  create a button with an icon and some text:
  
      <paper-button>
        <iron-icon icon="favorite"></iron-icon>
        custom button content
      </paper-button>
  
  ### Styling
  
  Style the button with CSS as you would a normal DOM element.
  

      paper-button.fancy {
        background: green;
        color: yellow;

      }
  

      paper-button.fancy:hover {
        background: lime;
      }

      paper-button[disabled],
      paper-button[toggles][active] {
        background: red;

      }
  

  By default, the ripple is the same color as the foreground at 25% opacity. You may
  customize the color using the `--paper-button-ink-color` custom property.

  
  The following custom properties and mixins are also available for styling:
  
  Custom property | Description | Default
  ----------------|-------------|----------

  `--paper-button-ink-color` | Background color of the ripple | `Based on the button's color`

  `--paper-button` | Mixin applied to the button | `{}`

  `--paper-button-disabled` | Mixin applied to the disabled button. Note that you can also use the `paper-button[disabled]` selector | `{}`
  `--paper-button-flat-keyboard-focus` | Mixin applied to a flat button after it's been focused using the keyboard | `{}`
  `--paper-button-raised-keyboard-focus` | Mixin applied to a raised button after it's been focused using the keyboard | `{}`

  
  @demo demo/index.html
  -->
  
  <dom-module id="paper-button">

    <template>

      <style>
        :host {
          display: inline-block;
          position: relative;
          box-sizing: border-box;
          min-width: 5.14em;
          margin: 0 0.29em;
          background: transparent;
          text-align: center;
          font: inherit;
          text-transform: uppercase;
          outline-width: 0;
          border-radius: 3px;
          -moz-user-select: none;
          -ms-user-select: none;
          -webkit-user-select: none;
          user-select: none;
          cursor: pointer;
          z-index: 0;
          padding: 0.7em 0.57em;
  
          @apply(--paper-button);
        }

        :host([raised]) .keyboard-focus {
          font-weight: bold;
          @apply(--paper-button-raised-keyboard-focus);
        }

        :host(:not([raised])) .keyboard-focus {
          font-weight: bold;
          @apply(--paper-button-flat-keyboard-focus);
        }

        :host([disabled]) {
          background: #eaeaea;
          color: #a8a8a8;
          cursor: auto;
          pointer-events: none;

          @apply(--paper-button-disabled);
        }

        :host([noink]) paper-ripple {
          display: none;
        }

        paper-ripple {
          color: var(--paper-button-ink-color);
        }

        paper-material {
          border-radius: inherit;
          @apply(--layout-fit);
        }

        .content > ::content * {
          text-transform: inherit;
        }
      </style>

  
      <paper-ripple></paper-ripple>
  

      <paper-material  elevation="[[_elevation]]" animated></paper-material>
  
      <div class$="[[_computeContentClass(receivedFocusFromKeyboard)]]">

        <content></content>

      </div>

  
    </template>

  </dom-module>
  
  <script>

    Polymer({

      is: 'paper-button',
  
      behaviors: [
        Polymer.PaperButtonBehavior
      ],
  
      properties: {

        /**
         * If true, the button should be styled with a shadow.
         */
        raised: {
          type: Boolean,
          reflectToAttribute: true,
          value: false,
          observer: '_calculateElevation'
        }
      },
  
      _calculateElevation: function() {
        if (!this.raised) {
          this._elevation = 0;
        } else {
          Polymer.PaperButtonBehaviorImpl._calculateElevation.apply(this);
        }
      },
  
      _computeContentClass: function(receivedFocusFromKeyboard) {
        var className = 'content ';
        if (receivedFocusFromKeyboard) {
          className += ' keyboard-focus';
        }
        return className;
      }
    });

  </script>