react-native-parallax-scroll

A ScrollView-like component that:

• Has a parallax background
• Has a parallax foreground
• Has a fixed or sticky header
• Can be nested within other views(FlatList, SectionList)
• Works on iOS and Android

Installation

$ npm install @monterosa/react-native-parallax-scroll --save

Demo

YouTube - https://www.youtube.com/watch?v=zM4koduK32Y

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Basic Usage

import ParallaxScroll from '@monterosa/react-native-parallax-scroll';

// Inside of a component's render() method:
render() {
  return (
     <ParallaxScroll
      renderHeader={({ animatedValue }) => <Header animatedValue={animatedValue} />}
      headerHeight={50}
      isHeaderFixed={false}
      parallaxHeight={250}
      renderParallaxBackground={({ animatedValue }) => <Background animatedValue={animatedValue} />}
      renderParallaxForeground={({ animatedValue }) => <Foreground animatedValue={animatedValue} />}
      parallaxBackgroundScrollSpeed={5}
      parallaxForegroundScrollSpeed={2.5}
    >
      <Welcome />
    </ParallaxScroll>
  );
}

Examples

Please clone the repo and run npm run storybook or yarn storybook to show examples of usages.

Usage (API)

All of the properties of ScrollView are supported. Please refer to the ScrollView documentation for more detail.

The ParallaxScroll component adds a few additional properties, as described below.

Property	Type	Defaut	Description
style	object	{}	Component's styles
width	number	Dimensions.get('window').width	Component's width.
height	number	Dimensions.get('window').height	Component's height.
innerRef	func	null	To get a reference to the scrollable component.
scrollStyle	object	{}	These styles will be applied to the scroll view.
headerHeight	number	45	This is the height of sticky(fixed) header.
renderHeader	({ width, height, animatedValue }) => {}	null	This renders an optional sticky(fixed) header that will be visible to the top of the view.
onHeaderFixed	func	null	A callback function that is invoked when the header will attach to the top.
isHeaderFixed	bool	false	Is header fixed to top(not sticky)?
parallaxHeight	number	Dimensions.get('window').width * 9 / 16	This is the height of parallax.
useNativeDriver	bool	false	Enable Native driver for animated. NOTE: Works only with Animated.ScrollView component.
scrollableComponent	class	Animated.ScrollView	This is a class of scrollable component.
isBackgroundScalable	bool	true	Is background scalable on iOS?
headerBackgroundColor	string	rgba(0, 0, 0, 0)	The color of the unsticked(unfixed) header background. Can be empty '' string. NOTE: Dosen't work with useNativeDriver.
contentContainerStyle	object	{}	These styles will be applied to the scroll view content container which wraps all of the child views.
headerFixedTransformY	number	0	This number indicating how much the fixed header should move upwards during the scroll. Used as the hack to change fixed header height during scroll.
onChangeHeaderVisibility	func	null	A callback function that is invoked when the parallax header is hidden or shown (as the user is scrolling). Function is called with a boolean value to indicate whether header is visible or not.
renderParallaxBackground	({ width, height, animatedValue }) => {}	null	This renders the background of the parallax.
renderBackgroundPlaceholder	({ height, animatedValue }) => {}	null	By default we assume that you want to show the foreground and background in its own space. We prepend an empty view with the height of parallaxHeight. You can override this behaviour to layer things in between foreground and background. You might want to avoid foreground in such a scenario, see Issue #23 for more details.
renderParallaxForeground	({ width, height, animatedValue }) => {}	null	This renders the foreground of the parallax.
fadeOutParallaxBackground	bool	false	If true, the background will fade out as the user scrolls up.
fadeOutParallaxForeground	bool	false	If true, the foreground will fade out as the user scrolls up.
headerFixedBackgroundColor	string	rgba(0, 0, 0, 1)	The color of the sticked(fixed) header background.
backgroundScale	number	3	The speed factor that the background scales. Respects backgroundScaleOrigin
backgroundScaleOrigin	center or top	center	The point of which the background should scroll from. Use top with backgroundScale={2} in order to achieve iOS native parallax scroll behavior. Top will keep the background locked to the top of the scrollview, while scaling the image such that it stretches the background in the downwards direction.
parallaxBackgroundScrollSpeed	number	5	The speed factor that the background moves at relative to the scroll content.
parallaxForegroundScrollSpeed	number	5	The speed factor that the foreground moves at relative to the scroll content.

Latest changelog

All changes here

1.8.0 - 2018-04-14

Added

• renderBackgroundPlaceholder prop for overriding default behaviour to layer things in between foreground and background (#23)

1.7.0 - 2018-04-12

Added

• backgroundScale and backgroundScaleOrigin props for support scaling from the top and make scale factor configurable (#22)

1.6.0 - 2018-04-05

Fixed

• Based on the Component, instead of PureComponent

Contributing

I welcome contributions! Please open an issue if you have any feature ideas or find any bugs. I also accept pull requests with open arms. I will go over the issues when I have time. :)