react-native-js-shimmer-placeholder

Shimmering effect using react-native-reanimated, react-native-linear-gradient and react-native-masked-view

Demo

Installation

Make sure you have already installed react-native-reanimated, react-native-linear-gradient and react-native-masked-view or install it from their links

npm install react-native-js-shimmer-placeholder --save

or using yarn

yarn add react-native-js-shimmer-placeholder

Usage

To use shimmering effect for View

import {
  ViewPlaceholder,
  Direction,
} from "react-native-js-shimmer-placeholder";

<ViewPlaceholder
  show={true}
  width={100}
  height={100}
  style={{
    borderWidth: 1,
    borderColor: "lightgrey",
    borderRadius: 50,
  }}
  direction={Direction.UP}
  gradientContainerStyle={{ borderRadius: 50 }}
>
  <View
    style={{
      height: 100,
      backgroundColor: "#318fb5",
      borderRadius: 50,
      alignItems: "center",
      justifyContent: "center",
    }}
  >
    <Text style={{ fontSize: 30 }}>🚀</Text>
  </View>
</ViewPlaceholder>;

To use shimmering effect for Text

import { TextPlaceholder } from "react-native-js-shimmer-placeholder";

<TextPlaceholder
  show={true}
  textStyle={{ fontSize: 24, fontWeight: "bold" }}
  style={{
    flex: 1,
    width: "100%",
    justifyContent: "center",
    alignItems: "center",
  }}
  textColor={"#318fb5"}
>
  Hey React Native devs!
</TextPlaceholder>;

Properties

Common props for both ViewPlaceholder and TextPlaceholder

Prop	Description	Default
baseColor	The base color of the linear gradient	white
boomerangMode	After reaching the end of animation, either restart from the beginning or reverse back towards it	false
canTriggerAnimationCompletion	Conditional trigger of Animation completion (useful for lists)	true
canUseProc	Should use proc function from reanimated	true
direction	Sets the direction of the Shimmer to move	Direction.RIGHT
gradientStyle	Style for the Linear Gradient itself	{}
highlightColor	The highlight color for the shimmer	rgba(211,211,211,0.5)
locations	Same as the prop used in Linear Gradient	[0, 0.5, 1]
onAnimationComplete	Triggers on animation completion	emptyFn
repeatCount	Number of times to repeat the animation	Depends on show prop
repeatDelay*	Delay after which the current animation will repeat	0
show	Whether to show the shimmer effect	true
totalDuration	Duration of the single shimmer cycle	1500

^*Set canUseProc prop to true for the maximum number of items with same repeatDelay and false to others if you use different repeatDelay's.

Props only for ViewPlaceholder

Prop	Description	Default
children	Child to render inside placeholder	null
childrenWrapperStyle	Wrapper style for the children	{}
style	Container style for shimmer which wraps the Linear Gradient and the children you pass	{}
gradientContainerStyle	Container style for gradient	{}
height	Height of the shimmer	100%
width	Width of the Shimmer	Required

To pass View props just pass the props as you do for a View Component

Props only for TextPlaceholder

Prop	Description	Default
children	Text to be shimmered	undefined
style	Style for the MaskedView	{ flex:1 }
viewBehindMaskStyle	Children of MaskedView which gives the actual color for the Text	{ flex:1, width:"100%" }
textStyle	Style for Text to be rendered	{}
textColor	Text color of the children	#5F717B

To pass Text Props just pass the props as you do for a Text Component

Limitation

1. Do not use for more than 5 number of list item because of this react-native-reanimated limitation software-mansion/react-native-reanimated#782

TODO List

• Adding support for Reanimated 2 which will solve the above mentioned limitation

Contribution

Any help to improve the module is appreciated

LICENSE

react-native-js-shimmer-placeholder is licensed under The MIT License