@rsmdc/tab-scroller NPM

Tab Scroller

A Tab Scroller allows for smooth native and animated scrolling of tabs.

Design & API Documentation

Installation

npm install @rsmdc/tab-scroller

Basic Usage

HTML Structure

<div class="mdc-tab-scroller">
  <div class="mdc-tab-scroller__scroll-area">
    <div class="mdc-tab-scroller__scroll-content"></div>
  </div>
</div>

Styles

@import "@rsmdc/tab/mdc-tab-scroller";

JavaScript Instantiation

import {MDCTabScroller} from '@rsmdc/tab-scroller';

const tabScroller = new MDCTabScroller(document.querySelector('.mdc-tab-scroller'));

See Importing the JS component for more information on how to import JavaScript.

Style Customization

CSS Classes

CSS Class	Description
`mdc-tab-scroller`	Mandatory. Contains the tab scroller content.
`mdc-tab-scroller__scroll-area`	Mandatory. Denotes the scrolling area.
`mdc-tab-scroller__scroll-content`	Mandatory. Denotes the scrolling content.
`mdc-tab-scroller--align-start`	Optional. Sets the elements inside the scroll content element to be aligned to the start of the scroll content element.
`mdc-tab-scroller--align-end`	Optional. Sets the elements inside the scroll content element to be aligned to the end of the scroll content element.
`mdc-tab-scroller--align-center`	Optional. Sets the elements inside the scroll content element to be aligned to the center of the scroll content element.

NOTE: The align modifier classes are only applicable when the contents do not meet or exceed the width of the Tab Scroller and Tab Bar (i.e., most commonly, when mdc-tab--min-width is used on each tab).

`MDCTabScroller` Methods

Method Signature	Description
`scrollTo(scrollX: number) => void`	Scrolls to the scrollX value.
`incrementScroll(scrollX: number) => void`	Increments the current scroll value by the scrollX value.
`getScrollPosition() => number`	Returns the current visual scroll position.
`getScrollContentWidth() => number`	Returns the width of the scroll content element.

Usage within Web Frameworks

If you are using a JavaScript framework, such as React or Angular, you can create a Tab Scroller for your framework. Depending on your needs, you can use the Simple Approach: Wrapping MDC Web Vanilla Components, or the Advanced Approach: Using Foundations and Adapters. Please follow the instructions here.

`MDCTabScrollerAdapter`

Method Signature	Description
`eventTargetMatchesSelector(eventTarget: EventTarget, selector: string) => boolean`	Returns `true` if the given event target satisfies the given CSS selector.
`addClass(className: string) => void`	Adds a class to the root element.
`addScrollAreaClass(className: string) => void`	Adds a class to the scroll area element.
`removeClass(className: string) => void`	Removes a class from the root element.
`setScrollAreaStyleProperty(property: string, value: string) => void`	Sets the given style property on the scroll area element.
`setScrollContentStyleProperty(property: string, value: string) => void`	Sets the given style property on the scroll content element.
`getScrollContentStyleValue(property: string) => string`	Returns the given style property value on the scroll content element.
`setScrollAreaScrollLeft(scrollLeft: number) => void`	Sets the scroll area element's `scrollLeft`.
`getScrollAreaScrollLeft() => number`	Returns the scroll area element's `scrollLeft`.
`getScrollContentOffsetWidth() => number`	Returns the scroll content element's `offsetWidth`.
`getScrollAreaOffsetWidth() => number`	Returns the scroll area element's `offsetWidth`.
`computeHorizontalScrollbarHeight() => number`	Returns the height of the browser's horizontal scrollbars (in px).

`util` Functions

MDC Tab Scroller provides a util module with functions to help implement adapter methods.

Function Signature	Description
`computeHorizontalScrollbarHeight(document: Document) => number`	Returns the height of the browser's horizontal scrollbars (in px).
`getMatchesProperty(HTMLElementPrototype: Object) => string`	Returns the appropriate property name for the `matches` API in the current browser environment.

`MDCTabScrollerFoundation`

Method Signature	Description
`scrollTo(scrollX: number) => void`	Scrolls to the `scrollX` value.
`incrementScroll(scrollX: number) => void`	Increments the current scroll value by the `scrollX` value.
`getScrollPosition() => number`	Returns the current visual scroll position.