<link rel="import" href="../iron-flex-layout/classes/iron-flex-layout.html">
<link rel="import" href="../iron-dropdown/iron-dropdown.html">
<link rel="import" href="../neon-animation/neon-animations.html">
<link rel="import" href="paper-square-grow-animation.html">

<!--
`paper-fab-speed-dial` builds on `iron-dropdown` to allow showing a list of
speed dial actions when tapping on a floating action button.

This element expects its content to contain two children: one with the class
`dropdown-trigger` , which is initially visible and acts as the trigger, and
another one with the class `dropdown-content` , which will be hidden until the
trigger is tapped, and will contain the speed dial option elements.

Example:

    <paper-fab-speed-dial>
      <paper-fab icon="add" class="dropdown-trigger"></paper-fab>
      <div class="dropdown-content">
        <paper-fab mini icon="star-border"></paper-fab>
        <paper-fab mini icon="star-half"></paper-fab>
        <paper-fab mini icon="star"></paper-fab>
      </div>
    </paper-fab-speed-dial>

The `direction` property can be set to `top`, `bottom`, `left` or `right` to
control the direction in which the options dropdown is expanded.

### Styling

The following custom properties and mixins are also available for styling:

Custom property | Description | Default
----------------|-------------|----------
`--paper-fab-speed-dial-option` | Mixin applied to each option element | `{}`

@hero hero.svg
@demo demo/index.html
-->

<dom-module id="paper-fab-speed-dial">
  <template>
    <style>
      .vertical ::content .dropdown-content {
        @apply(--layout-vertical);
      }
      .horizontal ::content .dropdown-content {
        @apply(--layout-horizontal);
      }
      ::content .dropdown-content > * {
        margin: 8px;
        @apply(--paper-fab-speed-dial-option);
      }
    </style>
    <content id="fabContainer" select=".dropdown-trigger"></content>
    <iron-dropdown
      id="dropdown"
      open-animation-config="[[openAnimationConfig]]"
      close-animation-config="[[closeAnimationConfig]]">
      <content id="contentContainer" select=".dropdown-content"></content>
    </iron-dropdown>
  </template>
</dom-module>
<script>
(function(Polymer) {
  Polymer({
    is: 'paper-fab-speed-dial',
    properties: {

      /**
       * The direction in which to expand the options. One of `top`, `bottom`
       * `left` and `right`.
       */
      direction: {
        type: String,
        value: 'bottom'
      },
      /**
        * A pixel value for the distance of the first option fron the trigger
        * button.
        */
      offset: {
        type: Number,
        value: 66
      },
      /**
       * An animation config. If provided, this will be used to animate the
       * opening of the options dropdown.
       */
      openAnimationConfig: {
        type: Array,
        value: function() {
          return [{
            name: 'fade-in-animation',
            timing: {
              delay: 150,
              duration: 50
            }
          }, {
            name: 'paper-square-grow-animation',
            startSize: 56,
            timing: {
              delay: 150,
              duration: 200
            }
          }];
        }
      },
      /**
       * An animation config. If provided, this will be used to animate the
       * closing of the options dropdown.
       */
      closeAnimationConfig: {
        type: Array,
        value: function() {
          return [{
            name: 'fade-out-animation',
            timing: {
              duration: 200
            }
          }];
        }
      }
    },
    observers: [
      '_updateDropdown(direction, offset)'
    ],
    ready: function() {

      var fab = Polymer.dom(this.$.fabContainer).getDistributedNodes()[0];
      fab.addEventListener('tap', function() {
        this.$.dropdown.open();
      }.bind(this));

      var content = Polymer.dom(this.$.contentContainer).getDistributedNodes()[0];
      content.addEventListener('tap', function() {
        this.$.dropdown.close();
      }.bind(this));
    },
    /**
     * Show the speed dial options.
     */
    open: function() {
      this.$.dropdown.open();
    },
    /**
     * Hide the speed dial options.
     */
    close: function() {
      this.$.dropdown.close();
    },
    _updateDropdown: function(direction, offset) {
      var d = this.$.dropdown;
      switch(direction) {
      case 'bottom':
        d.verticalAlign = 'top';
        d.horizontalOffset = 0;
        d.verticalOffset = offset;
        d.classList.add('vertical');
        d.classList.remove('horizontal');
        break;
      case 'top':
        d.verticalAlign = 'bottom';
        d.horizontalOffset = 0;
        d.verticalOffset = offset;
        d.classList.add('vertical');
        d.classList.remove('horizontal');
        break;
      case 'right':
        d.horizontalAlign = 'left';
        d.horizontalOffset = offset;
        d.verticalOffset = 0;
        d.classList.add('horizontal');
        d.classList.remove('vertical');
        break;
      case 'left':
        d.horizontalAlign = 'right';
        d.horizontalOffset = offset;
        d.verticalOffset = 0;
        d.classList.add('horizontal');
        d.classList.remove('vertical');
        break;
      default:
        throw 'Invalid direction. Must be one of [top, bottom, left, right].';
      }
    }
  });
})(Polymer);
</script>