edda4294
 Luigi Serra
updates
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<!--
@license
Copyright (c) 2015 The Polymer Project Authors. All rights reserved.
This code may only be used under the BSD style license found at http://polymer.github.io/LICENSE.txt
The complete set of authors may be found at http://polymer.github.io/AUTHORS.txt
The complete set of contributors may be found at http://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 http://polymer.github.io/PATENTS.txt
-->
<link rel="import" href="../polymer/polymer.html">
<link rel="import" href="../iron-menu-behavior/iron-menu-behavior.html">
<link rel="import" href="../paper-styles/default-theme.html">
<!--
Material design: [Menus](https://www.google.com/design/spec/components/menus.html)
`<paper-listbox>` implements an accessible listbox control with Material Design styling. The focused item
is highlighted, and the selected item has bolded text.
<paper-listbox>
<paper-item>Item 1</paper-item>
<paper-item>Item 2</paper-item>
</paper-listbox>
An initial selection can be specified with the `selected` attribute.
<paper-listbox selected="0">
<paper-item>Item 1</paper-item>
<paper-item>Item 2</paper-item>
</paper-listbox>
Make a multi-select listbox with the `multi` attribute. Items in a multi-select listbox can be deselected,
and multiple item can be selected.
<paper-listbox multi>
<paper-item>Item 1</paper-item>
<paper-item>Item 2</paper-item>
</paper-listbox>
### Styling
The following custom properties and mixins are available for styling:
Custom property | Description | Default
----------------|-------------|----------
`--paper-listbox-background-color` | Menu background color | `--primary-background-color`
`--paper-listbox-color` | Menu foreground color | `--primary-text-color`
`--paper-listbox` | Mixin applied to the listbox | `{}`
### Accessibility
`<paper-listbox>` has `role="listbox"` by default. A multi-select listbox will also have
`aria-multiselectable` set. It implements key bindings to navigate through the listbox with the up and
down arrow keys, esc to exit the listbox, and enter to activate a listbox item. Typing the first letter
of a listbox item will also focus it.
@group Paper Elements
@element paper-listbox
@hero hero.svg
@demo demo/index.html
-->
<dom-module id="paper-listbox">
<template>
<style>
:host {
display: block;
padding: 8px 0;
background: var(--paper-listbox-background-color, --primary-background-color);
color: var(--paper-listbox-color, --primary-text-color);
@apply(--paper-listbox);
}
</style>
<content></content>
</template>
<script>
(function() {
Polymer({
is: 'paper-listbox',
behaviors: [
Polymer.IronMenuBehavior
],
hostAttributes: {
role: 'listbox'
}
});
})();
</script>
</dom-module>
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