<!– @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-icon/iron-icon.html”> <link rel=“import” href=“../paper-behaviors/paper-inky-focus-behavior.html”> <link rel=“import” href=“../paper-styles/default-theme.html”>

<!– Material design: [Icon toggles](www.google.com/design/spec/components/buttons.html#buttons-toggle-buttons)

`paper-icon-button` is a button with an image placed at the center. When the user touches the button, a ripple effect emanates from the center of the button.

`paper-icon-button` includes a default icon set. Use `icon` to specify which icon from the icon set to use.

<paper-icon-button icon="menu"></paper-icon-button>

See [`iron-iconset`](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-icon-button icon="favorite"></paper-icon-button>
<paper-icon-button src="star.png"></paper-icon-button>

To use `paper-icon-button` as a link, wrap it in an anchor tag. Since `paper-icon-button` will already receive focus, you may want to prevent the anchor tag from receiving focus as well by setting its tabindex to -1.

<a href="https://www.polymer-project.org" tabindex="-1">
  <paper-icon-button icon="polymer"></paper-icon-button>
</a>

### Styling

Style the button with CSS as you would a normal DOM element. If you are using the icons provided by `iron-icons`, they will inherit the foreground color of the button.

/* make a red "favorite" button */
<paper-icon-button icon="favorite" style="color: red;"></paper-icon-button>

By default, the ripple is the same color as the foreground at 25% opacity. You may customize the color using the `–paper-icon-button-ink-color` custom property.

The following custom properties and mixins are available for styling:

Custom property | Description | Default —————-|————-|———- `–paper-icon-button-disabled-text` | The color of the disabled button | `–disabled-text-color` `–paper-icon-button-ink-color` | Selected/focus ripple color | `–primary-text-color` `–paper-icon-button` | Mixin for a button | `{}` `–paper-icon-button-disabled` | Mixin for a disabled button | `{}` `–paper-icon-button-hover` | Mixin for button on hover | `{}`

@group Paper Elements @element paper-icon-button @demo demo/index.html –>

<dom-module id=“paper-icon-button”>

<template strip-whitespace>
  <style>
    :host {
      display: inline-block;
      position: relative;
      padding: 8px;
      outline: none;
      -webkit-user-select: none;
      -moz-user-select: none;
      -ms-user-select: none;
      user-select: none;
      cursor: pointer;
      z-index: 0;
      line-height: 1;

      width: 40px;
      height: 40px;

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

      /* Because of polymer/2558, this style has lower specificity than * */
      box-sizing: border-box !important;

      @apply(--paper-icon-button);
    }

    :host #ink {
      color: var(--paper-icon-button-ink-color, --primary-text-color);
      opacity: 0.6;
    }

    :host([disabled]) {
      color: var(--paper-icon-button-disabled-text, --disabled-text-color);
      pointer-events: none;
      cursor: auto;

      @apply(--paper-icon-button-disabled);
    }

    :host(:hover) {
      @apply(--paper-icon-button-hover);
    }

    iron-icon {
      --iron-icon-width: 100%;
      --iron-icon-height: 100%;
    }
  </style>

  <iron-icon id="icon" src="[[src]]" icon="[[icon]]" alt$="[[alt]]"></iron-icon>
</template>

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

    hostAttributes: {
      role: 'button',
      tabindex: '0'
    },

    behaviors: [
      Polymer.PaperInkyFocusBehavior
    ],

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

      /**
       * 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
      },

      /**
       * Specifies the alternate text for the button, for accessibility.
       */
      alt: {
        type: String,
        observer: "_altChanged"
      }
    },

    _altChanged: function(newValue, oldValue) {
      var label = this.getAttribute('aria-label');

      // Don't stomp over a user-set aria-label.
      if (!label || oldValue == label) {
        this.setAttribute('aria-label', newValue);
      }
    }
  });
</script>

</dom-module>