px-dropdown-chevron.html

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    Relative paths assume component is being run from inside an app or another component, where dependencies are flat
    siblings. When this component is run from its own repo (e.g. ui tests, examples), we assume the server is started with
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<link rel="import" href="../polymer/polymer.html" />
<link rel="import" href="../px-polymer-font-awesome/polymer-font-awesome.html" />


<!--
Element providing a chevron for the px-dropdown element.

##### Usage

```
    <px-dropdown-chevron class="px-dropdown-chevron"></px-dropdown-chevron>
```

@element px-dropdown-chevron
@blurb Element which, when clicked, opens the px-dropdown-content element.
@homepage index.html
@demo demo.html
-->
<link rel="import" href="css/px-dropdown-chevron-styles.html">

<dom-module id="px-dropdown-chevron">
  <template>
    <style include="px-dropdown-chevron-styles"></style>
    <div class$="{{_chevronClass(hover, opened)}} px-dropdown-chevron" id="trigger">
      <iron-icon icon="fa:fa-angle-down" class$="{{_chevronClass(hover, opened)}} angle-down"></iron-icon>
    </div>
  </template>
</dom-module>

<script>
  Polymer({
    is: 'px-dropdown-chevron',
    properties:{
      /**
       * Boolean which reflects whether the chevron is being hovered over.
       *
       * @prop hover
       * @type Boolean
       * @default false
       * @notify true
       */
      hover: {
        type: Boolean,
        value: false,
        notify: true
      },
      /**
       * Boolean which reflects whether the menu is open.
       *
       * @prop opened
       * @type Boolean
       * @default false
       * @notify true
       */
      opened: {
        type: Boolean,
        value: false,
        notify: true
      }
    },
    listeners: {
      'hoverOff': '_manipulateHoverOff',
      'hoverOn': '_manipulateHoverOn',
      'opened': '_manipulateOpened'
    },
    /**
     * this function flips the opened flag, and changes the class for the component
     *
     *
     * @method _manipulateOpened
     */
    _manipulateOpened: function(evt) {
      evt.stopPropagation();
      this.opened = !this.opened;
    },
    /**
     * this function sets the hover flag to false, and changes the class for the component
     *
     * @method _manipulateHoverOff
     */
    _manipulateHoverOff: function(evt) {
      evt.stopPropagation();
      this.hover = false;
    },
    /**
     * this function sets the hover flag to true, and changes the class for the component
     *
     * @method _manipulateHoverOn
     */
    _manipulateHoverOn: function(evt) {
      evt.stopPropagation();
      this.hover = true;
    },
    /**
     * This method add either the opened or hover class.
     *
     * @method _chevronClass
     */
    _chevronClass: function() {
      if (this.opened) {
        return "opened";
      } else if (this.hover) {
        return "hover";
      }
    }
  });
</script>