@material/tabs
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2.3.0 • Public • Published

Important - Deprecation Notice

The mdc-tabs package is deprecated and no longer maintained, and is no longer included in the all-in-one material-components-web package. Improved functionality is available across the mdc-tab-bar, mdc-tab-scroller, mdc-tab-indicator, and mdc-tab packages, which are now included in the material-components-web package. Bugs and feature requests will no longer be accepted for this package. It is recommended that you migrate to the new packages to continue to receive new features and updates.

MDC Tabs

The MDC Tabs component contains components which are used to create spec-aligned tabbed navigation components adhering to the Material Design tabs guidelines. These components are:

  • mdc-tab: The individual tab elements
  • mdc-tab-bar: The main component which is composed of mdc-tab elements
  • mdc-tab-bar-scroller: The component which controls the horizontal scrolling behavior of an mdc-tab-bar that overflows its container

Design & API Documentation

Installation

npm install @material/tabs

Tabs usage

mdc-tab-bar can be used as a CSS only component, or a more dynamic JavaScript component.

There are also three different permutations of tab labels. These include text, icon-only, and text with icon. An example of each is available on the demo site.

Icons

We recommend using Material Icons from Google Fonts:

<head>
  <link rel="stylesheet" href="https://fonts.googleapis.com/icon?family=Material+Icons">
</head>

However, you can also use SVG, Font Awesome, or any other icon library you wish.

Tab Bar with text labels

<nav id="basic-tab-bar" class="mdc-tab-bar">
  <a class="mdc-tab mdc-tab--active" href="#one">Home</a>
  <a class="mdc-tab" href="#two">Merchandise</a>
  <a class="mdc-tab" href="#three">About Us</a>
  <span class="mdc-tab-bar__indicator"></span>
</nav>

Tab Bar with icon labels

<nav class="mdc-tab-bar mdc-tab-bar--icon-tab-bar">
  <a class="mdc-tab mdc-tab--active" href="#recents">
    <i class="material-icons mdc-tab__icon" aria-label="Recents">phone</i>
  </a>
  <a class="mdc-tab" href="#favorites">
    <i class="material-icons mdc-tab__icon" aria-label="Favorites">favorite</i>
  </a>
  <a class="mdc-tab" href="#nearby">
    <i class="material-icons mdc-tab__icon" aria-label="nearby">person_pin</i>
  </a>
  <span class="mdc-tab-bar__indicator"></span>
</nav>

Tab Bar with icon and text labels

<nav id="icon-text-tab-bar" class="mdc-tab-bar mdc-tab-bar--icons-with-text">
  <a class="mdc-tab mdc-tab--with-icon-and-text mdc-tab--active" href="#recents">
    <i class="material-icons mdc-tab__icon" aria-hidden="true">phone</i>
    <span class="mdc-tab__icon-text">Recents</span>
  </a>
  <a class="mdc-tab mdc-tab--with-icon-and-text" href="#favorites">
    <i class="material-icons mdc-tab__icon" aria-hidden="true">favorite</i>
    <span class="mdc-tab__icon-text">Favorites</span>
  </a>
  <a class="mdc-tab mdc-tab--with-icon-and-text" href="#nearby">
    <i class="material-icons mdc-tab__icon" aria-hidden="true">person_pin</i>
    <span class="mdc-tab__icon-text">Nearby</span>
  </a>
  <span class="mdc-tab-bar__indicator"></span>
</nav>

CSS Only Support

In order for the indicator to appear, you will need to change your mark up if you are using CSS Only. Each .mdc-tab will have a child element with the class .mdc-tab__indicator as shown below:

<nav id="basic-tab-bar" class="mdc-tab-bar">
  <a class="mdc-tab mdc-tab--active" href="#one">
    Home
    <span class="mdc-tab__indicator"></span>
  </a>
  <a class="mdc-tab" href="#two">
    Merchandise
    <span class="mdc-tab__indicator"></span>
  </a>
  <a class="mdc-tab" href="#three">
    About Us
    <span class="mdc-tab__indicator"></span>
  </a>
</nav>

RTL Support

Tab Bars will reverse the order of their tabs if they are placed within an ancestor element with attribute dir="rtl".

<html dir="rtl">
  <!--...-->
  <nav id="basic-tab-bar" class="mdc-tab-bar">
    <a class="mdc-tab mdc-tab--active" href="#one">Home</a>
    <a class="mdc-tab" href="#two">Merchandise</a>
    <a class="mdc-tab" href="#three">About Us</a>
    <span class="mdc-tab-bar__indicator"></span>
  </nav>
</html>

Dynamic view switching

While facilitating the view switching is left up to the developer, the demo site provides a minimal example of how to do so using JavaScript, also shown below.

Markup:

<section id="dynamic-demo-toolbar">
  <nav id="dynamic-tab-bar" class="mdc-tab-bar" role="tablist">
    <a role="tab" aria-controls="panel-1"
       class="mdc-tab mdc-tab--active" href="#panel-1">Item One</a>
    <a role="tab" aria-controls="panel-2"
       class="mdc-tab" href="#panel-2">Item Two</a>
    <a role="tab" aria-controls="panel-3"
       class="mdc-tab" href="#panel-3">Item Three</a>
    <span class="mdc-tab-bar__indicator"></span>
  </nav>
</section>
<section>
  <div class="panels">
    <p class="panel active" id="panel-1" role="tabpanel" aria-hidden="false">Item One</p>
    <p class="panel" id="panel-2" role="tabpanel" aria-hidden="true">Item Two</p>
    <p class="panel" id="panel-3" role="tabpanel" aria-hidden="true">Item Three</p>
  </div>
  <div class="dots">
    <a class="dot active" data-trigger="panel-1" href="#panel-1"></a>
    <a class="dot" data-trigger="panel-2" href="#panel-2"></a>
    <a class="dot" data-trigger="panel-3" href="#panel-3"></a>
  </div>
</section>

Script:

var dynamicTabBar = window.dynamicTabBar = new mdc.tabs.MDCTabBar(document.querySelector('#dynamic-tab-bar'));
var dots = document.querySelector('.dots');
var panels = document.querySelector('.panels');

dynamicTabBar.tabs.forEach(function(tab) {
  tab.preventDefaultOnClick = true;
});

function updateDot(index) {
  var activeDot = dots.querySelector('.dot.active');
  if (activeDot) {
    activeDot.classList.remove('active');
  }
  var newActiveDot = dots.querySelector('.dot:nth-child(' + (index + 1) + ')');
  if (newActiveDot) {
    newActiveDot.classList.add('active');
  }
}

function updatePanel(index) {
  var activePanel = panels.querySelector('.panel.active');
  if (activePanel) {
    activePanel.classList.remove('active');
  }
  var newActivePanel = panels.querySelector('.panel:nth-child(' + (index + 1) + ')');
  if (newActivePanel) {
    newActivePanel.classList.add('active');
  }
}

dynamicTabBar.listen('MDCTabBar:change', function ({detail: tabs}) {
  var nthChildIndex = tabs.activeTabIndex;

  updatePanel(nthChildIndex);
  updateDot(nthChildIndex);
});

dots.addEventListener('click', function (evt) {
  if (!evt.target.classList.contains('dot')) {
    return;
  }

  evt.preventDefault();

  var dotIndex = [].slice.call(dots.querySelectorAll('.dot')).indexOf(evt.target);

  if (dotIndex >= 0) {
    dynamicTabBar.activeTabIndex = dotIndex;
  }

  updatePanel(dotIndex);
  updateDot(dotIndex);
})

Sass Mixins

To customize the ink color of any part of the tab, use the following mixins. We recommend you apply these mixins within CSS selectors like .foo-tab:not(.mdc-tab--active) to select your inactive tabs, foo-tab:hover to select the hover state of your tabs, and .foo-tab.mdc-tab--active to select your active tabs.

mdc-tab-ink-color

Use this mixin to set the color of all ink on the tab.

mdc-tab-icon-ink-color

This mixin customizes the icon ink color.

mdc-tab-label-ink-color

This mixin customizes the label ink color.

mdc-tab-bar-indicator-ink-color

This mixin customizes the indicator ink color.

Using the CSS-Only Component

mdc-tab-bar ships with css for styling a tab layout according to the Material Design spec. To use CSS only tab bars, simply use the available class names. Note the available mdc-tab--active modifier class. This is used to denote the currently active tab.

<nav class="mdc-tab-bar">
  <a class="mdc-tab mdc-tab--active" href="#one">Item One</a>
  <a class="mdc-tab" href="#two">Item Two</a>
  <a class="mdc-tab" href="#three">Three</a>
  <span class="mdc-tab-bar__indicator"></span>
</nav>

Using the JavaScript Component

mdc-tab-bar ships with a Component/Foundation combo for ingesting instances of mdc-tab (a tab). mdc-tab-bar uses its initialize() method call a factory function which gathers and instantiates any tab elements that are children of the mdc-tab-bar root element.

Including in code

ES Modules
import {MDCTab, MDCTabFoundation} from '@material/tabs';
import {MDCTabBar, MDCTabBarFoundation} from '@material/tabs';
CommonJS
const mdcTabs = require('@material/tabs');
const MDCTab = mdcTabs.MDCTab;
const MDCTabFoundation = mdcTabs.MDCTabFoundation;

const MDCTabBar = mdcTabs.MDCTabBar;
const MDCTabBarFoundation = mdcTabs.MDCTabBarFoundation;
AMD
require(['path/to/@material/tabs'], mdcTabs => {
  const MDCTab = mdcTabs.MDCTab;
  const MDCTabFoundation = mdcTabs.MDCTabFoundation;

  const MDCTabBar = mdcTabs.MDCTabBar;
  const MDCTabBarFoundation = mdcTabs.MDCTabBarFoundation;
});
Global
const MDCTab = mdc.tabs.MDCTab;
const MDCTabFoundation = mdc.tabs.MDCTabFoundation;

const MDCTabBar = mdc.tabs.MDCTabBar;
const MDCTabBarFoundation = mdc.tabs.MDCTabBarFoundation;

Automatic Instantiation

If you do not care about retaining the component instance for the tabs, simply call attachTo() and pass it a DOM element.

mdc.tabs.MDCTabBar.attachTo(document.querySelector('#my-mdc-tab-bar'));

Manual Instantiation

Tabs can easily be initialized using their default constructors as well, similar to attachTo. This process involves a factory to create an instance of MDCTab from each tab Element inside of the mdc-tab-bar node during the initialization phase of MDCTabBar, e.g.:

<nav id="my-mdc-tab-bar" class="mdc-tab-bar">
  <a class="mdc-tab mdc-tab--active" href="#one">Item One</a>
  <a class="mdc-tab" href="#two">Item Two</a>
  <a class="mdc-tab" href="#three">Three</a>
  <span class="mdc-tab-bar__indicator"></span>
</nav>
import {MDCTabBar, MDCTabBarFoundation} from '@material/tabs';

const tabBar = new MDCTabBar(document.querySelector('#my-mdc-tab-bar'));

Using the JavaScript Tab Bar Scroller Component

mdc-tab-bar-scroller ships with a Component/Foundation combo which wraps instances of mdc-tab-bar. mdc-tab-bar-scroller uses its initialize() method call a factory function which gathers and instantiates any tab bar elements that are children of the mdc-tab-bar-scroller root element.

The anatomy of mdc-tab-bar-scroller includes an instance of mdc-tab-bar, RTL-aware forward and back indicators which, when actioned on, move the tab bar left and right, and a scroll frame. The scroll frame is the parent element of the tab bar, and serves to mask the tabs in the tab bar when they overflow the available width.

Including in code

ES Module syntax
import {MDCTab, MDCTabFoundation} from '@material/tabs';
import {MDCTabBar, MDCTabBarFoundation} from '@material/tabs';
import {MDCTabBarScroller, MDCTabBarFoundationScroller} from '@material/tabs';
CommonJS
const mdcTabs = require('@material/tabs');
const MDCTab = mdcTabs.MDCTab;
const MDCTabFoundation = mdcTabs.MDCTabFoundation;

const MDCTabBar = mdcTabs.MDCTabBar;
const MDCTabBarFoundation = mdcTabs.MDCTabBarFoundation;

const MDCTabBarScroller = mdcTabs.MDCTabBarScroller;
const MDCTabBarScrollerFoundation = mdcTabs.MDCTabBarScrollerFoundation;
AMD
require(['path/to/@material/tabs'], mdcTabs => {
  const MDCTab = mdcTabs.MDCTab;
  const MDCTabFoundation = mdcTabs.MDCTabFoundation;

  const MDCTabBar = mdcTabs.MDCTabBar;
  const MDCTabBarFoundation = mdcTabs.MDCTabBarFoundation;

  const MDCTabBarScroller = mdcTabs.MDCTabBarScroller;
  const MDCTabBarScrollerFoundation = mdcTabs.MDCTabBarScrollerFoundation;
});
Global
const MDCTab = mdc.tabs.MDCTab;
const MDCTabFoundation = mdc.tabs.MDCTabFoundation;

const MDCTabBar = mdc.tabs.MDCTabBar;
const MDCTabBarFoundation = mdc.tabs.MDCTabBarFoundation;

const MDCTabBarScroller = mdc.tabs.MDCTabBarScroller;
const MDCTabBarScrollerFoundation = mdc.tabs.MDCTabBarScrollerFoundation;

Automatic Instantiation

If you do not care about retaining the component instance for the tabs, simply call attachTo() and pass it a DOM element.

mdc.tabs.MDCTabBarScroller.attachTo(document.querySelector('#my-mdc-tab-bar-scroller'));

Manual Instantiation

Tab Bar Scrollers can easily be initialized using their default constructors as well, similar to attachTo. This process involves a factory to create an instance of MDCTabBar from the mdc-tab-bar Element inside of the mdc-tab-bar-scroller node during the initialization phase of MDCTabBarScroller, e.g.:

<div id="my-mdc-tab-bar-scroller" class="mdc-tab-bar-scroller">
  <div class="mdc-tab-bar-scroller__indicator mdc-tab-bar-scroller__indicator--back">
    <a class="mdc-tab-bar-scroller__indicator__inner material-icons" href="#" aria-label="scroll back button">
      navigate_before
    </a>
  </div>
  <div class="mdc-tab-bar-scroller__scroll-frame">
    <nav id="my-scrollable-tab-bar" class="mdc-tab-bar mdc-tab-bar-scroller__scroll-frame__tabs">
      <a class="mdc-tab mdc-tab--active" href="#one">Item One</a>
      <a class="mdc-tab" href="#two">Item Two</a>
      <a class="mdc-tab" href="#three">Item Three</a>
      <a class="mdc-tab" href="#four">Item Four</a>
      <a class="mdc-tab" href="#five">Item Five</a>
      <a class="mdc-tab" href="#six">Item Six</a>
      <a class="mdc-tab" href="#seven">Item Seven</a>
      <a class="mdc-tab" href="#eight">Item Eight</a>
      <a class="mdc-tab" href="#nine">Item Nine</a>
      <span class="mdc-tab-bar__indicator"></span>
    </nav>
  </div>
  <div class="mdc-tab-bar-scroller__indicator mdc-tab-bar-scroller__indicator--forward">
    <a class="mdc-tab-bar-scroller__indicator__inner material-icons" href="#" aria-label="scroll forward button">
      navigate_next
    </a>
  </div>
</div>
import {MDCTabBarScroller, MDCTabBarScrollerFoundation} from '@material/tabs';

const tabBarScroller = new MDCTabBarScroller(document.querySelector('#my-mdc-tab-bar-scroller'));

Tab Bar Scrollers can also instantiate any mdc-tab-bar from a DOM element on the fly using a built in factory function:

import {MDCTabBarScroller, MDCTabBarScrollerFoundation} from '@material/tabs';

const tabBarEl = document.querySelector('#my-mdc-tab-bar');
const scrollerEl = document.querySelector('#my-mdc-tab-bar-scroller');

const tabBarScroller = new MDCTabBarScroller(scrollerEl, undefined, tabBarEl);

This will create an instance of MDC Tab Bar during the initialization phase of Tab Bar Scroller.

Tab

Tab component API

Properties

Property Name Type Description
computedWidth number (read-only) The width of the tab.
computedLeft number (read-only) The left offset of the tab.
isActive boolean Whether or not the tab is active. Setting this makes the tab active.
preventDefaultOnClick boolean Whether or not the tab will call preventDefault() on an event. Setting this makes the tab call preventDefault() on events.

Tab Events

MDCTab:selected

Broadcast when a user actions on the tab.

Using the Foundation Class

MDC Tab ships with an MDCTabFoundation class that external frameworks and libraries can use to integrate the component. As with all foundation classes, an adapter object must be provided.

Adapter API

Method Signature Description
addClass(className: string) => void Adds a class to the root element.
removeClass(className: string) => void Removes a class from the root element.
registerInteractionHandler(evt: string, handler: EventListener) => void Adds an event listener to the root element, for the specified event name.
deregisterInteractionHandler(evt: string, handler: EventListener) => void Removes an event listener from the root element, for the specified event name.
getOffsetWidth() => number Return the width of the tab
getOffsetLeft() => number Return distance between left edge of tab and left edge of its parent element
notifySelected() => {} Broadcasts an event denoting that the user has actioned on the tab

The full foundation API

MDCTabFoundation.getComputedWidth() => number

Return the computed width for tab.

MDCTabFoundation.getComputedLeft() => number

Return the computed left offset for tab.

MDCTabFoundation.isActive() => boolean

Return true if tab is active.

MDCTabFoundation.setActive(isActive = false) => void

Set tab to active. If isActive is true, adds the active modifier class, otherwise removes it.

MDCTabFoundation.preventsDefaultOnClick() => boolean

Return true if the tab prevents the default click action

MDCTabFoundation.setPreventDefaultOnClick(preventDefaultOnClick = false) => void

Sets tabs preventDefaultOnClick property to the value of the preventDefaultOnClick argument passed.

MDCTabFoundation.measureSelf() => void

Sets computedWidth_ and computedLeft_ for a tab.

Tab Bar

Tab Bar component API

Properties

Property Name Type Description
tabs MDCTab[] (read-only) An array of the tab bar's instances of MDC Tab.
activeTab MDCTab The currently active tab. Setting this makes the tab active.
activeTabIndex number The index of the currently active tab. Setting this makes the tab at the given index active.

MDCTabBar.layout() => void

Proxies to the foundation's layout() method.

Tab Bar Events

MDCTabBar:change

Broadcast when a user actions on a tab, resulting in a change in the selected tab.

Using the Foundation Class

mdc-tab-bar ships with an MDCTabBarFoundation class that external frameworks and libraries can use to integrate the component. As with all foundation classes, an adapter object must be provided.

Adapter API

Method Signature Description
addClass(className: string) => void Adds a class to the root element.
removeClass(className: string) => void Removes a class from the root element.
bindOnMDCTabSelectedEvent() => void Adds MDCTab:selected event listener to root
unbindOnMDCTabSelectedEvent() => void Removes MDCTab:selected event listener from root
registerResizeHandler(handler: EventListener) => void Adds an event listener to the root element, for a resize event.
deregisterResizeHandler(handler: EventListener) => void Removes an event listener from the root element, for a resize event.
getOffsetWidth() => number Returns width of root element.
setStyleForIndicator(propertyName: string, value: string) => void Sets style property for indicator.
getOffsetWidthForIndicator() => number Returns width of indicator.
notifyChange(evtData: Object) => void Emits MDCTabBar:change event, passes evtData.
getNumberOfTabs() => number Returns number of tabs in MDC Tabs instance.
getActiveTab() => MDCTab Returns the instance of MDCTab that is currently active.
isTabActiveAtIndex(index: number) => boolean Returns true if tab at index is active.
setTabActiveAtIndex(index: number) => void Sets tab active at given index.
isDefaultPreventedOnClickForTabAtIndex(index: number) => boolean Returns true if tab does not prevent default click action.
setPreventDefaultOnClickForTabAtIndex(index: number, preventDefaultOnClick: boolean) Sets preventDefaultOnClick for tab at given index
measureTabAtIndex(index: number) => void sets measurements (width, left offset) for tab at given index.
getComputedWidthForTabAtIndex(index: number) => number Returns width of tab at given index.
getComputedLeftForTabAtIndex(index: number) => number Returns left offset of tab at given index.

The full foundation API

MDCTabBarFoundation.layout() => void

Sets layout for the Tab Bar component.

MDCTabBarFoundation.getActiveTabIndex() => number

Returns index of currently active tab

MDCTabBarFoundation.getComputedWidth() => number

Returns the width of the element containing the tabs.

MDCTabBarFoundation.switchToTabAtIndex(index, shouldNotify) => void

Updates the active tab to be the tab at the given index, emits MDCTabBar:change if shouldNotify is true.

MDCTabBarFoundation.getActiveTabIndex() => number

Returns the index of the currently active tab.

Tab Bar Scroller

Tab Bar Scroller component API

Properties

Property Name Type Description
tabBar MDCTabBar (read-only) The scroller's tab bar.

MDCTabBarScroller.layout() => void

Proxies to the foundation's layout() method.

Using the Foundation Class

MDC Tab Bar Scroller ships with an MDCTabBarScrollerFoundation class that external frameworks and libraries can use to integrate the component. As with all foundation classes, an adapter object must be provided.

Adapter API

Method Signature Description
addClass(className: string) => void Adds a class to the root element.
removeClass(className: string) => void Removes a class from the root element.
eventTargetHasClass(target: HTMLElement, className: string) => boolean Returns true if target has a given class name
addClassToForwardIndicator(className: string) => void Adds a given class to the forward indicator
removeClassFromForwardIndicator(className: string) => void Removes a given class from the forward indicator
addClassToBackIndicator(className: string) => void Adds a given class to the back indicator
removeClassFromBackIndicator(className: string) => void Removes a given class from the back indicator
isRTL() => boolean Returns true if in RTL context. False otherwise.
registerBackIndicatorClickHandler(handler: EventListener) => void Registers an event handler to be called when a click event happens on the back indicator
deregisterBackIndicatorClickHandler(handler: EventHandler) => void Deregisters an event handler from a click event happening on the back indicator
registerForwardIndicatorClickHandler(handler: EventHandler) => void Registers an event handler to be called when a click event happens on the forward indicator
deregisterForwardIndicatorClickHandler(handler: EventHandler) => void Deregisters an event handler from a click event happening on the forward indicator.
registerCapturedInteractionHandler(evt: string, handler: EventHandler) => void Registers an event handler to be called when a focus, touchstart, or mousedown event happens on the root of the component. These events gets dispatched to the listener during the capture phase. They also govern the scrolling behavior when tabs are tabbed to or actioned on.
deregisterCapturedInteractionHandler(evt: string, handler: EventHandler) => void Deregisters an event handler from a focus, touchstart, or mousedown events happening on the root of the component
registerWindowResizeHandler(handler: EventHandler) => void Registers an event handler to be called when a resize event happens on the window
deregisterWindowResizeHandler(handler: EventHandler) => void Deregisters an event handler from a resize event happening on the window
getNumberOfTabs() => number Returns the number of tabs in the scroller's tab bar
getComputedWidthForTabAtIndex(index: number) => number Returns the width of a tab at the given index
getComputedLeftForTabAtIndex(index: number) => number Returns the left offset of a tab at the given index
getOffsetWidthForScrollFrame() => number Returns the width of the scroll frame. This is the width of the visible tabs.
getScrollLeftForScrollFrame() => number Returns the scrollLeft value of the scroll frame
setScrollLeftForScrollFrame(scrollLeftAmount: number) => void Sets the value of scrollLeft for the scroll frame.
getOffsetWidthForTabBar() => number Returns the width of the entire tab bar, including that which is occluded.
setTransformStyleForTabBar(value: string) => void Sets the translateX transform property for the tab bar.
getOffsetLeftForEventTarget(target: HTMLElement) => number Returns the left offset of a given element.
getOffsetWidthForEventTarget(target: HTMLElement) => number Returns the width of a given element.

The full foundation API

MDCTabBarScrollerFoundation.scrollBack() => void

Scrolls the tab bar such that the leftmost tab traverses the scroll frame and becomes the rightmost tab, potentially being partially, but not fully, occluded.

MDCTabBarScrollerFoundation.scrollForward() => void

Scrolls the tab bar such that the rightmost tab traverses the scroll frame and becomes the leftmost tab. This tabs left offset will line up with the left edge of the scroll frame, and never be partially or fully occluded.

NOTE: Due to a quirk in event behavior, we allow the rightmost tab to be partially occluded even when tabbed to because clicking on such an element would shift the frame on the focus event. This would result in a scenario where the ripple persists and the intended tab would not be selected due to the tab bar shifting before the mouseup or click events get dispatched.

MDCTabBarScrollerFoundation.scrollToTabAtIndex(index: number) => void

Scrolls the tab bar such that the tab at the index provided traverses the scroll frame and becomes the leftmost tab.

MDCTabBarScrollerFoundation.layout() => void

If the tab bar is overflowing its available width, this method will reset the back and forward indicators to the correct states (visible/hidden) based on the new width.

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