Experiments with High Performance Animation in React Native

Three major methods for shape animation with React Native via @salesforceeng

  • This story is my experience and experiments to achieve high performance animation in React Native.Along the way I learned tons from these blogs and recommend you read them as you dive deeper into building your own animations in React Native:React Native Animations Using Animated API from Nader DabitReact Native ART and D3 from Harry WolffBefore we continue, I would like to define what “high performance animation” in terms of my project.
  • Note: There is another OpenGL binding for React Native which enables a more flexible OpenGL implementation without the interface.Animation in React NativeIn my exploration I tested three major methods (with some variations) for doing shape animation with React Native.
  • For example, if we have a shape with a 1px border, it cannot be transformed to have a larger width/height and retain the same border width without redrawing.Experiments and ResultsRequest Animation Frame + JavaScript tweeningThe first approach is to change nothing but use the same code from the web implementation — meaning everything is done in JavaScript without any help from React Native.
  • The gaps between each country will also get scaled so the transformed shapes are not the same as the new shapes.Zoom animation with fade in/outThis method has a significant impact on the memory footprint since there are two views with a shadow node per shape.Animated + Hybrid Native Driver + Animated Shape (ART)For this approach I still used the Native Driver while I found there is a trick to communicate between the JS thread and UI thread using setNativeProps.
  • I first tried with React Native ART and switched to React Native SVG while both give similar results.Animated + Hybrid Native Driver + Animated Shape (OpenGL)After realizing the bottleneck comes from re-drawing shapes, I switched to another library which has the drawing logic implemented in OpenGL.

Archiving decent animation performance is quite tricky. This story is my experience and experiments to achieve high performance animation in React Native.
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How to Animate the Items of a React Native FlatList

  • Be sure to subscribe!Animating EntryTo easily demo our animation we’ll animated to insertion of the list item.
  • When a new item is added to the people array we’ll change the opacity of the row and, via transform, the scale and rotation.It’s important to note that inside the TouchableOpacity we’re using an Animated.View which allows us to modify that component using animated values.First we’ll create a new animated value and, when the component mounts, we’ll change that value from 0 to 1 using Animated.timing.Then we need to drive our UI from these values.
  • We can’t do that in componentWillUnmout because the component will be gone before any animations can run!If you test this out though you’ll see that it doesn’t actually do anything — the row just disappears the same as before.If you comment out the onRemove function you can see that the animation is happening.What we can do is call the onRemove function when the animation completes.
  • We’re now left with some subtle, yet slick, animations for each row item for whenever they’re added or removed.
  • It covers component design, Redux, Redux Saga, and more animations!Want more React Native videos?

I was recently asked about animating items in a React Native list — specifically animating the item when added and removed. That’s what we’ll cover today! To accomplish this we’ll use the FlatList…
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React Native

React Native - How to create Twitter exploding hearts  #coding #softwaredev

  • Finally our opacity stays 1 until frame 9.99 (the end of our circle stroke) then we kill it on frame 10.
  • So from frame 10 to 12 it will spring up fast to 1.2 scale, and then slowly fall back from 1.2 to 1 from frames 12 to 18 .
  • We have the heart hidden after frame 1 , so what this animation says is at 0 , inital render, be gray.
  • Alright so we scale up, based on the image we scale up to .3 in a single frame, then over the course of 3 frames we scale up our circle to a scale of 1.
  • It’s essentially a way to make an animation not a whole frame, and or happen virtually immediately.

A blog of JavaScript techniques and tutorials. Including React, React Native, and anything else I feel like writing about.
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Some Basics React.js Beginners Should Know

Some Basics #Reactjs Beginners Should Know by @iAnkurMishra cc @CsharpCorner  #JavaScript

  • Always keep this thing in mind, else, you will end-up with your awesome react code.
  • Always make your components as small as possible.
  • The article tells how this will give you a head start on React.
  • The answer is we all know about Flux.
  • There are two types to define React components.

In this article, you will learn about some basics about React.js beginners should know.
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Some Basics React.js beginner should know – dailycodebook

Some Basics #React.JS beginner should know | Daily Code Book

  • So always keep the thing in mind otherwise you will end-up with your awesome react code.
  • First thing you have to be clear, React.JS is not an MVC framework or any other kind of framework.
  • We round things out with Webpack for bundling our code, and NPM for package management, and we’re now fully JavaScript buzzword compliant 🙂
  • Many documentations are available online by using then you can set your environment and can start working with React.JS. but before starting big things you have to know some basics.
  • This is the language which makes hard stuff as easy as easy stuff, but sometime it makes easy stuff as hard as hard stuff, which you do by using simple jQuery or Javasript.

React.Js is an emerging programming thing for developers. This is the language which makes hard stuff as easy as easy stuff, but sometime it makes easy stuff as hard as hard stuff, which you do by using simple jQuery or Javasript. Many documentations are available online by using then you can set your environment and can start working with React.JS. but before starting big things you have to know some basics. I learnt some react.JS. sharing my points:
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Chart Transitions with React and D3 4.0 — delimited

  • You can also change the offset type and the chart will transition the paths .
  • Functions like the stack layout, for example, no longer mutate your data.
  • I think the examples turned out well, but I would consider these prototypes for the moment.

Read the full article, click here.


@DelimitedTech: “Happy Thursday! Been awhile. New blog article: Chart Transitions with #reactjs and #d3js 4.0 #javascript #dataviz”


I have been working in my spare time on ideas for using the new separate D3
4.0 modules with React.  Below I present some examples of using the enter,
update and exit pattern to create transitions in React that do not rely on
using React.findDOMNode and handing over control of DOM elements to D3.   I
think the examples turned out well, but I would consider these prototypes
for the moment.


Chart Transitions with React and D3 4.0 — delimited