SGH / COMPONENTS

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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/classes/iron-flex-layout.html">
<link rel="import" href="../paper-styles/default-theme.html">
<link rel="import" href="../paper-styles/color.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">

<!--
Material Design: <a href="http://www.google.com/design/spec/components/buttons.html">Button</a>

`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 | `{}`

@group Paper Elements
@demo demo/index.html

-->

<dom-module id="paper-fab">
  <style>

    :host {
      display: inline-block;
      position: relative;
      outline: none;
      -moz-user-select: none;
      -ms-user-select: none;
      -webkit-user-select: none;
      -webkit-tap-highlight-color: rgba(0,0,0,0);
      user-select: none;
      cursor: pointer;

      box-sizing: border-box;
      min-width: 0;
      width: 56px;
      height: 56px;
      background: var(--paper-fab-background, --accent-color);
      color: var(--text-primary-color);
      border-radius: 50%;
      padding: 16px;

      z-index: 0;

      @apply(--paper-fab);
    }

    :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);
    }

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

    .keyboard-focus {
      background: var(--paper-fab-keyboard-focus-background, --paper-pink-900);
    }
  </style>
  <template>
    <paper-ripple></paper-ripple>
    <paper-material class$="[[_computeContentClass(receivedFocusFromKeyboard)]]" elevation="[[_elevation]]" animated>
      <iron-icon id="icon" src="[[src]]" icon="[[icon]]"></iron-icon>
    </paper-material>
  </template>
</dom-module>
<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.
       *
       * @attribute src
       * @type string
       * @default ''
       */
      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.
       *
       * @attribute icon
       * @type string
       * @default ''
       */
      icon: {
        type: String,
        value: ''
      },

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

    _computeContentClass: function(receivedFocusFromKeyboard) {
      var className = 'content';
      if (receivedFocusFromKeyboard) {
        className += ' keyboard-focus';
      }
      return className;
    }

  });
</script>