react-native-swiper-parallax v0.1.0

Swiper parallax

react-native-swiper-parallax is a swiper component for React Native featuring paging and an optional parallax effect. Compatible with Android & iOS.

Getting started

npm install react-native-swiper-parallax --save

Usage

Content and delayed content are being passed as render props.

import Slider from 'react-native-swiper-parallax';

class MyComponent extends Component {
  renderContent = content => {
    return (
      <Content>
        <Text>content</Text>
      </Content>
    );
  };

  renderDelayedContent = content => {
    return (
      <DelayedContent>
        <Text>{content.title}</Text>
      </DelayedContent>
    );
  };

  render() {
    return (
      <Slider
        slides={slides}
        renderContent={this.renderContent}
        renderDelayedContent={this.renderDelayedContent}
        delayFactor={0.3}
        triggeringThreshold={0}>
        {(slideCount, currentIndex, nextIndex, requestSlideIndex) => (
          <Fragment>
            <PagingContainer>
              <Paging
                slideCount={slideCount}
                currentSlideIndex={currentIndex}
                currentControlColor={colors.mainOrange}
                defaultControlColor="rgba(46, 43, 43, 0.25)"
              />
            </PagingContainer>

            <BottomBar
              swipe={() => requestSlideIndex(currentIndex, currentIndex + 1)}
            />
          </Fragment>
        )}
      </Slider>
    );
  }
}

In depth

The Slider component is using React context api. It has a provider and every child which uses the HOC withSliderContext has access to the Slider store which is shown below.

const SliderContext = createContext({
  currentIndex: null,
  nextIndex: null,
  setCurrentIndex: () => {},
  setNextIndex: () => {},
  slideCount: null,
});

The Slider itself is inside the provider and has therefore access to an action which sets the next index before the animation is triggered. The Paging component while being connected to the Slider store is aware of any index change in real time. Slider has a shouldComponentUpdate method which prevents the component from re rendering when the nextIndex is set:

shouldComponentUpdate(nextProps: OwnProps) {
		return this.props.nextIndex === nextProps.nextIndex;
}

Props

OwnProps (withSliderContext HOC)