Flutter Stack Menu

When hamburger menu is clicked, the main content slides left and scale smaller to reveal sidebar.

import 'package:flutter/material.dart';
class StackPage extends StatefulWidget {
@override
_StackPageState createState() => _StackPageState();
}
class _StackPageState extends State<StackPage>
with SingleTickerProviderStateMixin {
AnimationController _controller;
@override
void initState() {
_controller =
AnimationController(vsync: this, duration: Duration(milliseconds: 500));
super.initState();
}
void _toggle() {
setState(() {
_controller.isDismissed ? _controller.forward() : _controller.reverse();
});
}
FlatButton _menuItem(IconData icon, String text, VoidCallback onPressed){
return FlatButton(onPressed: onPressed, child: Row(
children: [
Icon(icon, color: Colors.white,),
SizedBox(width: 8,),
Text(text, style: TextStyle(color: Colors.white),)
],
));
}
@override
Widget build(BuildContext context) {
return AnimatedBuilder(
animation: _controller,
builder: (BuildContext context, Widget child) {
double slide = 50 * _controller.value;
double scale = 1 - (_controller.value * 0.5);
return Stack(
children: [
Container(
width: double.infinity,
color: Colors.lightBlueAccent,
child: Padding(
padding: const EdgeInsets.only(
top: 50.0, left: 16.0, right: 16.0, bottom: 16.0),
child: Row(
mainAxisAlignment: MainAxisAlignment.start,
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Expanded(
child: Column(
crossAxisAlignment: CrossAxisAlignment.start,
children: [
Text(
'Navigation',
style: Theme.of(context).textTheme.headline6,
),
_menuItem(Icons.home, 'Home', (){}),
_menuItem(Icons.pages, 'Page 1', (){}),
_menuItem(Icons.palette, 'Page 2', (){}),
_menuItem(Icons.close, 'Close Menu', () => _toggle()),
],
),
flex: 5,
),
Expanded(
child: Container(),
flex: 5,
)
],
),
),
),
Transform(
transform: Matrix4.identity()
..translate(slide)
..scale(scale),
alignment: Alignment.centerRight,
child: Scaffold(
appBar: AppBar(
title: Text('Example'),
actions: [
IconButton(
icon: Icon(Icons.dehaze),
onPressed: () {
_toggle();
},
)
],
),
body: Center(
child: Text('Main page'),
),
),
),
],
);
},
);
}
@override
void dispose() {
_controller.dispose();
super.dispose();
}
}

By continuing to use the site, you agree to the use of cookies. more information

The cookie settings on this website are set to "allow cookies" to give you the best browsing experience possible. If you continue to use this website without changing your cookie settings or you click "Accept" below then you are consenting to this.

Close