dependencies:
  flutter_inner_drawer: "^0.5.2"

import 'package:flutter_inner_drawer/inner_drawer.dart';
.
.
.
   
    @override
    Widget build(BuildContext context)
    {
        return InnerDrawer(
            key: _innerDrawerKey,
            onTapClose: true, // default false
            swipe: true, // default true            
            colorTransition: Color.red, // default Color.black54
            leftOffset: 0.6, // default 0.4
            rightOffset: 0.6,// default 0.4            
            leftScale: 0.9,// default 1
            rightScale: 0.9,// default 1
            proportionalChildArea : true, // default true
            borderRadius: 50, // default 0
            leftAnimationType: InnerDrawerAnimation.static, // default static
            rightAnimationType: InnerDrawerAnimation.quadratic,
            backgroundColor: Colors.red, // default  Theme.of(context).backgroundColor
            
            //when a pointer that is in contact with the screen and moves to the right or left            
            onDragUpdate: (double val, InnerDrawerDirection direction) {
                // return values between 1 and 0
                print(val);
                // check if the swipe is to the right or to the left
                print(direction==InnerDrawerDirection.start);
            },
            
            innerDrawerCallback: (a) => print(a), // return  true (open) or false (close)
            leftChild: Container(), // required if rightChild is not set
            rightChild: Container(), // required if leftChild is not set
            
            //  A Scaffold is generally used but you are free to use other widgets
            // Note: use "automaticallyImplyLeading: false" if you do not personalize "leading" of Bar
            scaffold: Scaffold(
                appBar: AppBar(
                    automaticallyImplyLeading: false
                ),
            ) 
            OR
            CupertinoPageScaffold(                
                navigationBar: CupertinoNavigationBar(
                    automaticallyImplyLeading: false
                ),
            ), 
        )
    }
    
    //  Current State of InnerDrawerState
    final GlobalKey<InnerDrawerState> _innerDrawerKey = GlobalKey<InnerDrawerState>();    

    void _toggle()
    {
       _innerDrawerKey.currentState.toggle(
       // direction is optional 
       // if not set, the last direction will be used
       //InnerDrawerDirection.start OR InnerDrawerDirection.end                        
        direction: InnerDrawerDirection.end 
       );
    }