Customizable, lightweight React Native carousel component with accessibility support.

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Pinar is a lightweight and customizable React Native carousel component that works well when creating simple image sliders or app onboarding flows.

If you need more advanced things like animations, lazy loading of images, or parallax, then please consider using a library like react-native-reanimated-carousel.

Table of contents

• Table of contents
  • Install
  • Basic example
  • More examples
  • Properties
    • Basic carousel properties
    • Callbacks
    • Methods
    • Custom styling properties
    • Custom render properties
    • Properties of <ScrollView />
  • Dependencies
  • Development
    • How to develop locally
    • Automated tests
  • Special thanks
  • License

Install

yarn add pinar --save

## or
## npm install pinar --save

Basic example

import React from "react";
import { Text, View, StyleSheet } from "react-native";
import Carousel from "pinar";

const styles = StyleSheet.create({
  slide1: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    backgroundColor: "#a3c9a8"
  },
  slide2: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    backgroundColor: "#84b59f"
  },
  slide3: {
    flex: 1,
    justifyContent: "center",
    alignItems: "center",
    backgroundColor: "#69a297"
  },
  text: {
    color: "#1f2d3d",
    opacity: 0.7,
    fontSize: 48,
    fontWeight: "bold"
  }
});

export default () => (
  <Carousel>
    <View style={styles.slide1}>
      <Text style={styles.text}>1</Text>
    </View>
    <View style={styles.slide2}>
      <Text style={styles.text}>2</Text>
    </View>
    <View style={styles.slide3}>
      <Text style={styles.text}>3</Text>
    </View>
  </Carousel>
);

Result:

More examples

The /examples folder has a React Native app that you can run on your machine to see the carousel being used with a lot of different options.

If you don't want to run the app, you can have a look at the components folder for example components.

Properties

Basic carousel properties

Property	Default	Type	Description
horizontal	true	boolean	Set to false for a vertical carousel.
loop	false	boolean	Set to true to enable continuous loop mode.
index	0	number	Index number of initial slide.
showsControls	true	boolean	Set to false to hide prev/next buttons.
showsDots	true	boolean	Set to false to hide pagination dots.
autoplay	false	boolean	Set to true enable autoplay mode.
autoplayInterval	3000	number	Delay between autoplay page changes (in milliseconds).
width	-	number	If not specified, the default fullscreen mode is enabled using flex: 1.
height	-	number	If not specified, the default fullscreen mode is enabled using flex: 1.
accessibility	true	boolean	Set to false to disable accessibility features (not recommended).
accessibilityLabelPrev	Previous	string	Accessibility label for the prev button.
accessibilityLabelNext	Next	string	Accessibility label for the next button.
mergeStyles	false	boolean	Set to true to merge your custom styles with the default styles.

Callbacks

Use these properties to be notified when the user scrolls the carousel or changes the page.

Property	Parameters	Type	Description
onIndexChanged	({ index, total }) => void	function	Called with the new page index when the user changes a page.
onLayout	(event) => void	function	Called when layout changes for the main <View> wrapper element.
onScroll	(event) => void	function	Called when <ScrollView> is scrolled.
onMomentumScrollEnd	(event) => void	function	Called when <ScrollView>'s momentum scroll finishes.

Methods

To use methods you need to get a reference to the carousel inside your React class component.

<Carousel
  ref={carousel => {
    this.carousel = carousel;
  }}
/>

You can then call the method from outside the carousel:

<Button
  title="scroll to next page"
  onPress={() => {
    this.carousel.scrollToNext();
  }}
/>

Method	Arguments	Type	Description
scrollToPrev	None	function	Scroll to the previous page.
scrollToNext	None	function	Scroll to the next page.
scrollBy	{index: number, animated: boolean}	function	Scroll by a number of pages. The number can be negative to scroll backwards.
scrollToIndex	{index: number, animated: boolean}	function	Scroll to a page index (0 based).
startAutoplay	None	function	Starts carousel autoplay.
stopAutoplay	None	function	Stops carousel autoplay.

Custom styling properties

Use these properties to customize how the carousel is styled.

Set the mergeStyles property to true if you want to merge your custom styles with the default ones instead of having define all the needed styles. You can also import { defaulStyles } from "pinar" to get access to the default styles and use them as defaults.

Have a look at the "custom styles" component and "custom styles with merge" component for an example.

Property	Default	Type	Description
style	{...}	StyleProp<ViewStyle>	See default style in the source code.
ScrollView
containerStyle	{...}	StyleProp<ViewStyle>	See default style in the source code.
contentContainerStyle	{...}	StyleProp<ViewStyle>	See default container style in the source code.
Prev/Next buttons
controlsContainerStyle	{...}	StyleProp<ViewStyle>	Custom style for the prev/next buttons container.
controlsButtonStyle	{...}	StyleProp<ViewStyle>	Custom style for the prev/next button.
controlsTextStyle	{...}	StyleProp<TextStyle>	Custom style for the prev/next button text.
Pagination dots
dotsContainerStyle	{...}	StyleProp<ViewStyle>	Custom style for the pagination dots container.
dotStyle	{...}	StyleProp<ViewStyle>	Custom style for a single pagination dot.
activeDotStyle	{...}	StyleProp<ViewStyle>	Custom style for the active pagination dot.

Custom render properties

Use these properties to provide your own functions render custom elements instead of the default ones. Have a look at the custom rendering component for an example.

Property	Function parameters	Type	Description
Pagination dots
renderDots	({ index, total, context }) => void	function	Use to render custom pagination dots.
renderDot	({ index }) => void	function	Use to render custom dot (not active).
renderActiveDot	({ index }) => void	function	Use to render custom active dot.
Prev/Next buttons
renderControls	({ scrollToPrev, scrollToNext }) => void	function	Use to render custom prev/next controls.
renderPrev	({ scrollToPrev }) => void	function	Use to render custom prev control.
renderNext	({ scrollToNext }) => void	function	Use to render custom next control.

Properties of <ScrollView />

These properties are exposed from <ScrollView />. You can provide your own properties if you want to customize it.

Property	Default	Type	Description
automaticallyAdjustContentInsets	false	bool	Controls whether iOS should automatically adjust the content inset for scroll views that are placed behind a navigation bar or tab bar/ toolbar.
bounces	false	bool	If true, the scroll view bounces when it reaches the end of the content if the content is larger then the scroll view along the axis of the scroll direction. If false, it disables all bouncing even if the alwaysBounce* props are true.
contentContainerStyle	undefined	StyleProp<ViewStyle>	These styles will be applied to the scroll view content container which wraps all of the child views.
onMomentumScrollEnd	undefined	function	Called when the momentum scroll ends (scroll which occurs as the ScrollView glides to a stop).
onScroll	undefined	function	Fires at most once per frame during scrolling. The frequency of the events can be controlled using the scrollEventThrottle prop.
pagingEnabled	true	bool	When true, the scroll view stops on multiples of the scroll view's size when scrolling. This can be used for horizontal pagination.
removeClippedSubviews	true	bool	When true, offscreen child views (whose overflow value is hidden) are removed from their native backing superview when offscreen. This can improve scrolling performance on long lists.
scrollEnabled	true	bool	When false, the view cannot be scrolled via touch interaction.
scrollEventThrottle	16	number	This controls how often the scroll event will be fired while scrolling (as a time interval in ms). A lower number yields better accuracy for code that is tracking the scroll position, but can lead to scroll performance problems due to the volume of information being send over the bridge. You will not notice a difference between values set between 1-16 as the JS run loop is synced to the screen refresh rate. If you do not need precise scroll position tracking, set this value higher to limit the information being sent across the bridge.
scrollsToTop	false	bool	When true, the scroll view scrolls to top when the status bar is tapped.
showsHorizontalScrollIndicator	false	bool	When true, shows a horizontal scroll indicator. The default value is true.
showsVerticalScrollIndicator	false	bool	When true, shows a vertical scroll indicator. The default value is true.

for more info: http://facebook.github.io/react-native/docs/scrollview.html

Dependencies

No other dependencies than React Native.

Development

If you want help out with the development of this library, bug reports and fixes are very welcome. If you are thinking about a new feature, please open a feature request issue first to verify that implementing it makes sense.

How to develop locally

First make sure that you have Node.js, Yarn and React Native installed. It is also a good idea to have Xcode and/or Android Studio installed to be able to run the iOS simulators / Android emulators.

If you choose to install emulators or simulators, you can use the example app to test your changes in a React Native app.

Automated tests

When making changes to the code, please add a unit test or a functional test to verify that the code is working. The test runner that the project uses is Jest, Enzyme is used to test React Components, and Detox is used to run functional tests against the project's example app. The command to run unit tests is yarn test and the command to run functional tests is yarn functional.

Before you submit the code for a Pull Request, make sure that you run yarn test, yarn tsc, and yarn lint to verify that unit tests pass and both the Typescript type checking and ESLint linting are not printing any errors.

Special thanks

Special thanks for these libraries for providing inspiration for code and other things:

• react-native-swiper - Inspiration for the code and the library API.
• react-native-snap-carousel - Inspiration for the library API and naming.
• svgr - Inspiration for the issue labels and issue templates.

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License

MIT