bower_components/paper-icon-button/paper-icon-button.html

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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
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="../iron-icon/iron-icon.html">
<link rel="import" href="../iron-flex-layout/iron-flex-layout.html">
<link rel="import" href="../paper-styles/default-theme.html">
<link rel="import" href="../paper-behaviors/paper-button-behavior.html">
<link rel="import" href="../paper-behaviors/paper-inky-focus-behavior.html">
<link rel="import" href="../paper-ripple/paper-ripple.html">
<!--
Material design: [Icon toggles](https://www.google.com/design/spec/components/buttons.html#buttons-toggle-buttons)
`paper-icon-button` is a button with an image placed at the center. When the user touches
the button, a ripple effect emanates from the center of the button.
`paper-icon-button` includes a default icon set.  Use `icon` to specify which icon
from the icon set to use.
    <paper-icon-button icon="menu"></paper-icon-button>
See [`iron-iconset`](#iron-iconset) for more information about
how to use a custom icon set.
Example:
    <link href="path/to/iron-icons/iron-icons.html" rel="import">
    <paper-icon-button icon="favorite"></paper-icon-button>
    <paper-icon-button src="star.png"></paper-icon-button>
### Styling
Style the button with CSS as you would a normal DOM element. If you are using the icons
provided by `iron-icons`, they will inherit the foreground color of the button.
    /* make a red "favorite" button */
    <paper-icon-button icon="favorite" style="color: red;"></paper-icon-button>
By default, the ripple is the same color as the foreground at 25% opacity. You may
customize the color using the `--paper-icon-button-ink-color` custom property.
The following custom properties and mixins are available for styling:
Custom property | Description | Default
----------------|-------------|----------
`--paper-icon-button-disabled-text` | The color of the disabled button | `--disabled-text-color`
`--paper-icon-button-ink-color` | Selected/focus ripple color | `--primary-text-color`
`--paper-icon-button` | Mixin for a button | `{}`
`--paper-icon-button-disabled` | Mixin for a disabled button | `{}`
@group Paper Elements
@element paper-icon-button
@demo demo/index.html
-->
<dom-module id="paper-icon-button">
  <template strip-whitespace>
    <style>
      :host {
        display: inline-block;
        position: relative;
        padding: 8px;
        outline: none;
        -webkit-tap-highlight-color: rgba(0,0,0,0);
        -webkit-user-select: none;
        -moz-user-select: none;
        -ms-user-select: none;
        user-select: none;
        cursor: pointer;
        z-index: 0;
        line-height: 1;
        
        width: 40px;
        height: 40px;
        /* Because of polymer/2558, this style has lower specificity than * */
        box-sizing: border-box !important;
        @apply(--paper-icon-button);
      }
      :host #ink {
        color: var(--paper-icon-button-ink-color, --primary-text-color);
        opacity: 0.6;
      }
      :host([disabled]) {
        color: var(--paper-icon-button-disabled-text, --disabled-text-color);
        pointer-events: none;
        cursor: auto;
        @apply(--paper-icon-button-disabled);
      }
      iron-icon {
        --iron-icon-width: 100%;
        --iron-icon-height: 100%;
      }
    </style>
    <iron-icon id="icon" src="[[src]]" icon="[[icon]]" alt$="[[alt]]"></iron-icon>
  </template>
  <script>
    Polymer({
      is: 'paper-icon-button',
      hostAttributes: {
        role: 'button',
        tabindex: '0'
      },
      behaviors: [
        Polymer.PaperInkyFocusBehavior
      ],
      properties: {
        /**
         * The URL of an image for the icon. If the src property is specified,
         * the icon property should not be.
         */
        src: {
          type: String
        },
        /**
         * Specifies the icon name or index in the set of icons available in
         * the icon's icon set. If the icon property is specified,
         * the src property should not be.
         */
        icon: {
          type: String
        },
        /**
         * Specifies the alternate text for the button, for accessibility.
         */
        alt: {
          type: String,
          observer: "_altChanged"
        }
      },
      _altChanged: function(newValue, oldValue) {
        var label = this.getAttribute('aria-label');
        // Don't stomp over a user-set aria-label.
        if (!label || oldValue == label) {
          this.setAttribute('aria-label', newValue);
        }
      }
    });
  </script>
</dom-module>