<!– @license Copyright © 2015 The Polymer Project Authors. All rights reserved. This code may only be used under the BSD style license found at polymer.github.io/LICENSE.txt The complete set of authors may be found at polymer.github.io/AUTHORS.txt The complete set of contributors may be found at 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 polymer.github.io/PATENTS.txt –>

<link rel=“import” href=“../polymer/polymer.html”> <link rel=“import” href=“../iron-flex-layout/iron-flex-layout.html”> <link rel=“import” href=“../iron-icon/iron-icon.html”> <link rel=“import” href=“../paper-behaviors/paper-button-behavior.html”> <link rel=“import” href=“../paper-material/paper-material-shared-styles.html”> <link rel=“import” href=“../paper-styles/color.html”> <link rel=“import” href=“../paper-styles/default-theme.html”>

<!– Material design: [Floating Action Button](www.google.com/design/spec/components/buttons-floating-action-button.html)

`paper-fab` is a floating action button. It contains an image placed in the center and comes in two sizes: regular size and a smaller size by applying the attribute `mini`. When the user touches the button, a ripple effect emanates from the center of the button.

You may import `iron-icons` to use with this element, or provide a URL to a custom icon. See `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-fab icon="add"></paper-fab>
<paper-fab mini icon="favorite"></paper-fab>
<paper-fab src="star.png"></paper-fab>

### Styling

The following custom properties and mixins are available for styling:

Custom property | Description | Default —————-|————-|———- `–paper-fab-background` | The background color of the button | `–accent-color` `–paper-fab-keyboard-focus-background` | The background color of the button when focused | `–paper-pink-900` `–paper-fab-disabled-background` | The background color of the button when it's disabled | `–paper-grey-300` `–paper-fab-disabled-text` | The text color of the button when it's disabled | `–paper-grey-500` `–paper-fab` | Mixin applied to the button | `{}` `–paper-fab-mini` | Mixin applied to a mini button | `{}` `–paper-fab-disabled` | Mixin applied to a disabled button | `{}` `–paper-fab-iron-icon` | Mixin applied to the iron-icon within the button | `{}` `–paper-fab-label` | Mixin applied to the label within the button | `{}`

@group Paper Elements @demo demo/index.html –>

<dom-module id=“paper-fab”>

<template strip-whitespace>
  <style include="paper-material-shared-styles">
    :host {
      @apply(--layout-vertical);
      @apply(--layout-center-center);

      background: var(--paper-fab-background, --accent-color);
      border-radius: 50%;
      box-sizing: border-box;
      color: var(--text-primary-color);
      cursor: pointer;
      height: 56px;
      min-width: 0;
      outline: none;
      padding: 16px;
      position: relative;
      -moz-user-select: none;
      -ms-user-select: none;
      -webkit-user-select: none;
      user-select: none;
      width: 56px;
      z-index: 0;

      /* NOTE: Both values are needed, since some phones require the value `transparent`. */
      -webkit-tap-highlight-color: rgba(0,0,0,0);
      -webkit-tap-highlight-color: transparent;

      @apply(--paper-fab);
    }

    [hidden] {
      display: none !important;
    }

    :host([mini]) {
      width: 40px;
      height: 40px;
      padding: 8px;

      @apply(--paper-fab-mini);
    }

    :host([disabled]) {
      color: var(--paper-fab-disabled-text, --paper-grey-500);
      background: var(--paper-fab-disabled-background, --paper-grey-300);

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

    iron-icon {
      @apply(--paper-fab-iron-icon);
    }

    span {
      width: 100%;
      white-space: nowrap;
      overflow: hidden;
      text-overflow: ellipsis;
      text-align: center;

      @apply(--paper-fab-label);
    }

    :host(.keyboard-focus) {
      background: var(--paper-fab-keyboard-focus-background, --paper-pink-900);
    }
  </style>

  <iron-icon id="icon" hidden$="{{!_computeIsIconFab(icon, src)}}" src="[[src]]" icon="[[icon]]"></iron-icon>
  <span hidden$="{{_computeIsIconFab(icon, src)}}">{{label}}</span>
</template>

<script>
  Polymer({
    is: 'paper-fab',

    behaviors: [
      Polymer.PaperButtonBehavior
    ],

    properties: {
      /**
       * The URL of an image for the icon. If the src property is specified,
       * the icon property should not be.
       */
      src: {
        type: String,
        value: ''
      },

      /**
       * 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,
        value: ''
      },

      /**
       * Set this to true to style this is a "mini" FAB.
       */
      mini: {
        type: Boolean,
        value: false,
        reflectToAttribute: true
      },

      /**
       * The label displayed in the badge. The label is centered, and ideally
       * should have very few characters.
       */
      label: {
        type: String,
        observer: '_labelChanged'
      }
    },

    _labelChanged: function() {
      this.setAttribute('aria-label', this.label);
    },

    _computeIsIconFab: function(icon, src) {
      return (icon.length > 0) || (src.length > 0);
    }
  });
</script>

</dom-module>