shariq93/animated-drawer-tutorial

Animated Drawer

Create an animated side drawer in react native with out using any third party library and being on Native Thread

Sample Code

import {Animated, Easing, Dimensions} from 'react-native';

   /** this will hold the value for our animation */
  const $translate = useRef(new Animated.Value(0)).current

 /** this will help us to keep track of drawer open and close state */
  let [toggleHeader, setToggleHeader] = useState(false)

Managing interpolation

Interpolate is a method in the React Native Animated library that allows you to map one range of values to another. It's commonly used to calculate values between two ranges that are used to drive animations.

/**
   * This is to manage size of main container of the screen 
   */
  const $scale = $translate.interpolate({
    inputRange: [0, width / 3, width / 2.3],
    outputRange: [1, .9, 0.8],
    extrapolate: 'clamp'
  })

  /**
  * to translate the main view to right in X direction 
  */
  const $translateHeader = $translate.interpolate({
    inputRange: [0, width / 3, width / 2.3],
    outputRange: [0, -50, -100],
    extrapolate: 'clamp'
  })

  /**
    * this value is to correct screen possition 
    */
  const $translateY = $translate.interpolate({
    inputRange: [0, width / 3, width / 2.3],
    outputRange: [0, -1, -2],
    extrapolate: 'clamp'
  })

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