<!– @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-flex-layout/iron-flex-layout.html”> <link rel=“import” href=“../paper-behaviors/paper-button-behavior.html”> <link rel=“import” href=“../paper-material/paper-material-shared-styles.html”>

<!– Material design: [Buttons](www.google.com/design/spec/components/buttons.html)

`paper-button` is a button. When the user touches the button, a ripple effect emanates from the point of contact. It may be flat or raised. A raised button is styled with a shadow.

Example:

<paper-button>Flat button</paper-button>
<paper-button raised>Raised button</paper-button>
<paper-button noink>No ripple effect</paper-button>
<paper-button toggles>Toggle-able button</paper-button>

A button that has `toggles` true will remain `active` after being clicked (and will have an `active` attribute set). For more information, see the `Polymer.IronButtonState` behavior.

You may use custom DOM in the button body to create a variety of buttons. For example, to create a button with an icon and some text:

<paper-button>
  <iron-icon icon="favorite"></iron-icon>
  custom button content
</paper-button>

To use `paper-button` as a link, wrap it in an anchor tag. Since `paper-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-button raised>Polymer Project</paper-button>
</a>

### Styling

Style the button with CSS as you would a normal DOM element.

paper-button.fancy {
  background: green;
  color: yellow;
}

paper-button.fancy:hover {
  background: lime;
}

paper-button[disabled],
paper-button[toggles][active] {
  background: red;
}

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

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

Custom property | Description | Default —————-|————-|———- `–paper-button-ink-color` | Background color of the ripple | `Based on the button's color` `–paper-button` | Mixin applied to the button | `{}` `–paper-button-disabled` | Mixin applied to the disabled button. Note that you can also use the `paper-button` selector | `{}` `–paper-button-flat-keyboard-focus` | Mixin applied to a flat button after it's been focused using the keyboard | `{}` `–paper-button-raised-keyboard-focus` | Mixin applied to a raised button after it's been focused using the keyboard | `{}`

@demo demo/index.html –>

<dom-module id=“paper-button”>

<template strip-whitespace>
  <style include="paper-material-shared-styles">
    :host {
      @apply(--layout-inline);
      @apply(--layout-center-center);
      position: relative;
      box-sizing: border-box;
      min-width: 5.14em;
      margin: 0 0.29em;
      background: transparent;
      -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
      -webkit-tap-highlight-color: transparent;
      font: inherit;
      text-transform: uppercase;
      outline-width: 0;
      border-radius: 3px;
      -moz-user-select: none;
      -ms-user-select: none;
      -webkit-user-select: none;
      user-select: none;
      cursor: pointer;
      z-index: 0;
      padding: 0.7em 0.57em;

      @apply(--paper-font-common-base);
      @apply(--paper-button);
    }

    :host([hidden]) {
      display: none !important;
    }

    :host([raised].keyboard-focus) {
      font-weight: bold;
      @apply(--paper-button-raised-keyboard-focus);
    }

    :host(:not([raised]).keyboard-focus) {
      font-weight: bold;
      @apply(--paper-button-flat-keyboard-focus);
    }

    :host([disabled]) {
      background: #eaeaea;
      color: #a8a8a8;
      cursor: auto;
      pointer-events: none;

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

    :host([animated]) {
      @apply(--shadow-transition);
    }

    paper-ripple {
      color: var(--paper-button-ink-color);
    }
  </style>

  <content></content>
</template>

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

    behaviors: [
      Polymer.PaperButtonBehavior
    ],

    properties: {
      /**
       * If true, the button should be styled with a shadow.
       */
      raised: {
        type: Boolean,
        reflectToAttribute: true,
        value: false,
        observer: '_calculateElevation'
      }
    },

    _calculateElevation: function() {
      if (!this.raised) {
        this._setElevation(0);
      } else {
        Polymer.PaperButtonBehaviorImpl._calculateElevation.apply(this);
      }
    }

    /**
    Fired when the animation finishes.
    This is useful if you want to wait until
    the ripple animation finishes to perform some action.

    @event transitionend
    Event param: {{node: Object}} detail Contains the animated node.
    */
  });
</script>

</dom-module>