Demo and API docs

<delightful-icons>

Material Design: Creative Customization

delightful-icons is a collection of icon sets and a helper <delightful-icon> element to assist transitioning between them. Each icon set is a pair of icons that can transition from one to another with an animation. These animations are part of Material Design's delightful details.

<delightful-icon>

<delightful-icon> is a helper element that wraps any element that uses an <iron-icon>. You can use it to define which icons to transition to.

<!-- Import transitions individually -->
<link rel="import" href="./bower_components/delightful-icons/icons/menu-arrow-back.html">
<link rel="import" href="./bower_components/delightful-icons/icons/menu-arrow-forward.html">

<!-- Or all transitions -->
<link rel="import" href="./bower_components/delightful-icons/icons/all.html">

<!-- Import transitions before <delightful-icon> element -->
<link rel="import" href="./bower_components/delightful-icons/delightful-icon.html">

<delightful-icon icon="menu" next="arrow-back" toggle-on="click">
  <paper-icon-button></paper-icon-button>
</delightful-icon>

<delightful-icon icon="play-arrow" next="pause" toggle-on="click">
  <paper-icon-button></paper-icon-button>
</delightful-icon>

<delightful-icon icon="add" next="create" toggle-on="click">
  <paper-icon-button></paper-icon-button>
</delightful-icon>

There are two ways to trigger a transition:

1. Change the icon property
2. Set the next property and invoke toggle()

<delightful-icon> can listen to a default event from its wrapped element to toggle on by setting the toggle-on attribute to the event name.

Wrapped element

By default, <delightful-icon> will use its first child as the wrapped element and set the icon property. This can be customized further with query and property attributes.

<delightful-icon icon="menu" next="arrow-back" toggle-on="click"
    query=".use-this" property="displayIcon">
  <div>
    <!-- <delightful-icon> will set the displayIcon property of this element -->
    <my-custom-element class="use-this"></my-custom-element>
  </div>
</delightful-icon>

Multi-icon transitions

You can transition between several icons, provided each icon transitioned to has an imported animation for the icon it is transitioning from.

<!-- This button will transition between menu, arrow-back, and arrow-forward -->
<delightful-icon id="menu-arrows" icon="menu">
  <paper-icon-button></paper-icon-button>
</delightful-icon>

<script>
window.addEventListener('WebComponentsReady', function() {
  var delight = document.querySelector('#menu-arrows');
  delight.iconElement.addEventListener('click', function() {
    if (delight.icon === 'menu') {
      delight.icon = 'arrow-back';
    } else if (delight.icon === 'arrow-back') {
      delight.icon = 'arrow-forward';
    } else {
      delight.icon = 'menu';
    }
  });
});
</script>

Styling

The following custom properties are available for styling:

Custom Property	Description	Default
--delightful-icons-duration	Transition duration	0.2s
--delightful-icons-easing	Transition easing	cubic-bezier(0.4, 0, 0.2, 1)

Compatibility

On browsers that do not support CSS transforms, the icon will immediately change from one to another without a transition.

• IE 11 does not support CSS transforms on SVG elements.
• Microsoft Edge is considering CSS transforms for SVG.
• Safari 9 supports CSS transforms, but due to other maintenance complications I have chosen to disable animations for 9. Safari 10+ will show animations correctly.