How to make navigation drawer appear bottom to app bar/ tool bar

Question

I have implemented navigation drawer. The drawer covers the App Bar but what i need is it should not cover the app bar and navigation drawer should start from the bottom of the app bar. I have achieved bringing list tiles to the bottom but i need whole navigation drawer to be in bottom of the app bar/ toolbar

I have attached screenshot below for the reference

import 'package:flutter/material.dart';
import 'package:navigationdrawer/second_fragment.dart';
import 'package:navigationdrawer/third_fragment.dart';

import 'first_fragment.dart';

class DrawerItem {
  String title;
  IconData icon;
  DrawerItem(this.title, this.icon);
}

void main() => runApp(new HomePage());

class HomePage extends StatefulWidget {
  final drawerItems = [
    new DrawerItem("Fragment 1", Icons.rss_feed),
    new DrawerItem("Fragment 2", Icons.local_pizza),
    new DrawerItem("Fragment 3", Icons.info)
  ];

  @override
  State<StatefulWidget> createState() {
    return new HomePageState();
  }
}

class HomePageState extends State<HomePage> {
  int _selectedDrawerIndex = 0;

  _getDrawerItemWidget(int pos) {
    switch (pos) {
      case 0:
        return new FirstFragment();
      case 1:
        return new SecondFragment();
      case 2:
        return new ThirdFragment();

      default:
        return new Text("Error");
    }
  }

  _onSelectItem(int index) {
    setState(() => _selectedDrawerIndex = index);
    Navigator.of(context).pop(); // close the drawer
  }

  @override
  Widget build(BuildContext context) {
    var drawerOptions = <Widget>[];
    for (var i = 0; i < widget.drawerItems.length; i++) {
      var d = widget.drawerItems[i];
      drawerOptions.add(new ListTile(
        leading: new Icon(d.icon),
        title: new Text(d.title),
        selected: i == _selectedDrawerIndex,
        onTap: () => _onSelectItem(i),
      ));
    }
    return new MaterialApp(
      theme: new ThemeData(
        primarySwatch: Colors.red,
      ),
      home: new Scaffold(
        appBar: new AppBar(
          title: new Text(widget.drawerItems[_selectedDrawerIndex].title),
        ),
        drawer: new Drawer(
          child: Container(
            child: new Column(
              children: <Widget>[
                Column(children: drawerOptions)
              ],
            ),
          ),
        ),
        body: _getDrawerItemWidget(_selectedDrawerIndex),
      ),
    );
  }
}

Solution

You can either use ListView for this, or a Column with Padding.

Update:

Using inbuilt Drawer won't let you go there, you will have to create your own drawer. Something like this:

Row(
  children: [
    YourVerticalDrawer(), // give it a fixed width to make it look consistent
    YourAppMainContent(),
  ]
)

Comments

[kiran kumar]

It only adds an extra space in the top of navigation drawer.

[Doc]

The person downvoting should also mention the reason. This answer may not be the correct approach but does exactly what the OP wants.