diegoveloper

class Persona  {
  
  final String nombre;
  final String edad;
  
  //modo 1 , parametros con nombre opcionales
  //Persona({this.nombre, this.edad});
  
    //modo 2 , valores obligatorios con posición fija
 // Persona(this.nombre, this.edad);

diegoveloper

class AnimatedItem extends StatefulWidget {
  final String title;

  const AnimatedItem({Key key, this.title}) : super(key: key);

  @override
  _AnimatedItemState createState() => _AnimatedItemState();
}

class _AnimatedItemState extends State<AnimatedItem>

diegoveloper

class SampleCardList extends StatelessWidget {
  final items = 20;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: [
          Expanded(
            flex: 2,

diegoveloper

double _valorSlider = 50;

   @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(),
      backgroundColor: Colors.grey,
      body: SliderTheme(
        data: Theme.of(context)
            .sliderTheme

diegoveloper

void main()  {
  
const Map mymap = {
  'status': {
    'start': ['Start', 'ok', 'go'],
  },
  'update': {
    'now': ['Start', 'ok', 'go'],
  },
  'time': [

diegoveloper

class _MyPage2State extends State<MyPage2> {
  String dropdownValue = "One";

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: DropdownButton<String>(
          value: dropdownValue,
          onChanged: (String newValue) {

diegoveloper

// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'dart:async';

import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:flutter/widgets.dart';

diegoveloper

import 'package:flutter/material.dart';

class AnimatedLine extends StatefulWidget {
  @override
  _AnimatedLineState createState() => _AnimatedLineState();
}

class _AnimatedLineState extends State<AnimatedLine>
    with SingleTickerProviderStateMixin {
  AnimationController _controller;

diegoveloper

class Sample2 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Material(
        child: CustomScrollView(
          slivers: [
            SliverPersistentHeader(
              delegate: MySliverAppBar(expandedHeight: 200),
              pinned: true,

diegoveloper

import 'package:flutter/material.dart';

class Sample1 extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Scaffold(
        drawer: Drawer(),
        appBar: MyCustomAppBar(
          height: 150,