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Mastering React Native

You're reading from   Mastering React Native Learn Once, Write Anywhere

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781785885785
Length 496 pages
Edition 1st Edition
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Authors (2):
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Eric Masiello Eric Masiello
Author Profile Icon Eric Masiello
Eric Masiello
Jacob Friedmann Jacob Friedmann
Author Profile Icon Jacob Friedmann
Jacob Friedmann
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Toc

Table of Contents (13) Chapters Close

Preface 1. Building a Foundation in React FREE CHAPTER 2. Saying HelloWorld in React Native 3. Styling and Layout in React Native 4. Starting our Project with React Native Components 5. Flux and Redux 6. Integrating with the NYT API and Redux 7. Navigation and Advanced APIs 8. Animation and Gestures in React Native 9. Refactoring for Android 10. Using and Writing Native Modules 11. Preparing for Production 12. React Native Tools and Resources

Using PanResponder with the Animated API

To round out our animation chapter, we'll explore one more very powerful way to leverage animation. PanResponder is a React Native API for tracking simple gestures. We can use PanResponder to track the user dragging their finger across the screen as a way to transition from panel to panel. As usual, we'll begin by importing PanResponder at the top of our file:

import { 
  StyleSheet, 
  View, 
  LayoutAnimation, 
  Animated, 
  PanResponder 
} from 'react-native'; 

PanResponder needs to track the value of state.pan as it updates. We'll do this by adding a componentWillMount lifecycle method. Here, we'll listen to changes in state.pan by utilizing the addListener method. We'll also add a componentWillUnmount method to remove the listener once the component is unmounted:

componentWillMount() { 
  this.dragPosition = 0; 
  this.panListener = this.state.pan.addListener((value) => { 
    this.dragPosition = value.value...
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