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<!--
Copyright (c) 2014 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
-->
<!--
`paper-tabs` is a `core-selector` styled to look like tabs. Tabs make it easy to
explore and switch between different views or functional aspects of an app, or
to browse categorized data sets.
Use `selected` property to get or set the selected tab.
Example:
<paper-tabs selected="0">
<paper-tab>TAB 1</paper-tab>
<paper-tab>TAB 2</paper-tab>
<paper-tab>TAB 3</paper-tab>
</paper-tabs>
See <a href="#paper-tab">paper-tab</a> for more information about
`paper-tab`.
Styling tabs:
To change the sliding bar color:
paper-tabs.pink::shadow #selectionBar {
background-color: #ff4081;
}
@group Paper Elements
@element paper-tabs
@extends core-selector
@homepage github.io
-->
<link rel="import" href="../core-selector/core-selector.html">
<link rel="import" href="paper-tab.html">
<polymer-element name="paper-tabs" extends="core-selector" attributes="noink nobar" role="tablist">
<template>
<link rel="stylesheet" href="paper-tabs.css">
<div id="tabsContainer" horizontal layout>
<shadow></shadow>
<div id="selectionBar" hidden?="{{nobar}}" on-transitionend="{{barTransitionEnd}}"></div>
</div>
</template>
<script>
Polymer('paper-tabs', {
/**
* If true, ink effect is disabled.
*
* @attribute noink
* @type boolean
* @default false
*/
noink: false,
/**
* If true, the bottom bar to indicate the selected tab will not be shown.
*
* @attribute nobar
* @type boolean
* @default false
*/
nobar: false,
activateEvent: 'down',
nostretch: false,
selectedIndexChanged: function(old) {
var s = this.$.selectionBar.style;
if (!this.selectedItem) {
s.width = 0;
s.left = 0;
return;
}
var w = 100 / this.items.length;
if (this.nostretch || old === null || old === -1) {
s.width = w + '%';
s.left = this.selectedIndex * w + '%';
return;
}
var m = 5;
this.$.selectionBar.classList.add('expand');
if (old < this.selectedIndex) {
s.width = w + w * (this.selectedIndex - old) - m + '%';
} else {
s.width = w + w * (old - this.selectedIndex) - m + '%';
s.left = this.selectedIndex * w + m + '%';
}
},
barTransitionEnd: function() {
var cl = this.$.selectionBar.classList;
if (cl.contains('expand')) {
cl.remove('expand');
cl.add('contract');
var s = this.$.selectionBar.style;
var w = 100 / this.items.length;
s.width = w + '%';
s.left = this.selectedIndex * w + '%';
} else if (cl.contains('contract')) {
cl.remove('contract');
}
}
});
</script>
</polymer-element>
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