| <!-- |
| @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> |