fabiomsr

 Widget _createDrawerItem(
      {IconData icon, String text, GestureTapCallback onTap}) {
    return ListTile(
      title: Row(
        children: <Widget>[
          Icon(icon),
          Padding(
            padding: EdgeInsets.only(left: 8.0),
            child: Text(text),
          )

fabiomsr

Widget _createHeader() {
    return DrawerHeader(
        margin: EdgeInsets.zero,
        padding: EdgeInsets.zero,
        decoration: BoxDecoration(
            image: DecorationImage(
                fit: BoxFit.fill,
                image: AssetImage('res/images/drawer_header_background.png'))),
        child: Stack(children: <Widget>[
          Positioned(

fabiomsr

import 'package:flutter/material.dart';

class AppDrawer extends StatelessWidget {
  
  @override
  Widget build(BuildContext context) {
    return Drawer(
      child: ListView(
        padding: EdgeInsets.zero,
        children: <Widget>[ ],

fabiomsr

class MyHomePage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("NotificationListener example"),
      ),
      body: NotificationListener<TimeNotification>(
          child: Timer(),
          onNotification: (notification) {

fabiomsr

class MyHomePage extends StatelessWidget {
  final _counter = new ValueNotifier(0);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        appBar: AppBar(
          title: Text("ValueListenableBuilder example"),
        ),
        body: CounterListenableProvider(

fabiomsr

class CounterText extends StatelessWidget {
  @override
  Widget build(BuildContext context) {

    return  ValueListenableBuilder<int>(
        valueListenable: CounterListenableProvider.of(context),
        builder: (context, value, child) {
          return new Text(value.toString());
        });
  }

fabiomsr

static ValueListenable<int> of(BuildContext context) {
    return (context.inheritFromWidgetOfExactType(CounterListenableProvider)
            as CounterListenableProvider)
        .counter;
}

fabiomsr

class CounterListenableProvider extends InheritedWidget {
  final ValueListenable<int> counter;

  CounterListenableProvider({Key key, @required this.counter, Widget child})
      : super(key: key, child: child);

  @override
  bool updateShouldNotify(InheritedWidget oldWidget) {
    return true;
  }

fabiomsr

@override
Widget build(BuildContext context) {
  return Scaffold(
      appBar: AppBar(
        title: Text("ValueListenableBuilder example"),
      ),
      body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: <Widget>[

fabiomsr

class MyHomePage extends StatelessWidget {
  final _counter = new ValueNotifier<int>(0);
}