我会尝试解释，
我有一个方法名称为createList的人：（此方法只是创建列表并返回包含此列表的列）
Widget criarLista(int qtd){
if(widget.listas.length == 1){
return new Text(
widget.listas[0].Descricao,
textAlign: TextAlign.center,
style: new TextStyle(color: Colors.red));
}else {
for (int i = widget.listas.length; i >= 1; i--) {
for (int j = 1; j < i; j++) {
if (widget.listas[j - 1].TotalVendas < widget.listas[j].TotalVendas) {
var aux1 = widget.listas[j].TotalVendas;
widget.listas[j].TotalVendas = widget.listas[j - 1].TotalVendas;
widget.listas[j - 1].TotalVendas = aux1;
var aux2 = widget.listas[j].CodigoProduto;
widget.listas[j].CodigoProduto = widget.listas[j - 1].CodigoProduto;
widget.listas[j - 1].CodigoProduto = aux2;
var aux3 = widget.listas[j].Descricao;
widget.listas[j].Descricao = widget.listas[j - 1].Descricao;
widget.listas[j - 1].Descricao = aux3;
var aux4 = widget.listas[j].QtdVendida;
widget.listas[j].QtdVendida = widget.listas[j - 1].QtdVendida;
widget.listas[j - 1].QtdVendida = aux4;
}
}
}
List<Widget> listaTiles = new List();
for(int i = 0; i <= qtd; i++){
listaTiles.add(
new Padding(
padding: new EdgeInsets.only(left: 20.0, right: 20.0, bottom: 7.0),
child:
new Container(
child:
new ListTile(
title: new Text(widget.listas[i].Descricao.toString(), style: new TextStyle(color: Colors.white, fontSize: 17.0, fontWeight: FontWeight.bold)),
subtitle: new Text(
"NºVendas : " + widget.listas[i].QtdVendida.toString() + "\n" +
"Vendas: " +
formatador(widget.listas[i].TotalVendas).toString(), style: new TextStyle(color: Colors.white)),
trailing: new Icon(escolherIcone(i), color: Colors.white,),
),
decoration: new BoxDecoration (
borderRadius: new BorderRadius.all(new Radius.circular(10.0)),
color: Colors.lightBlue,
),
padding: new EdgeInsets.fromLTRB(16.0, 5.0, 16.0, 5.0),
),));
}
Widget test = new Column(
mainAxisSize: MainAxisSize.min,
children: <Widget>[
listaTiles[0],
listaTiles[1],
listaTiles[2]
]
);
return test;
}
}
我想在第一个条件中输入
if(widget.listas.length == 1){
return new Text(
widget.listas[0].Descricao,
textAlign: TextAlign.center,
style: new TextStyle(color: Colors.red));
}
使用setState起作用的按钮，但是我真正的构建类在哪里
class RelatorioDasVendasTotsProdutos extends StatefulWidget {
@override
RelatorioDasVendasTotsProdutosState createState() => RelatorioDasVendasTotsProdutosState();
}
class RelatorioDasVendasTotsProdutosState extends State<RelatorioDasVendasTotsProdutos> {
@override
Widget build(BuildContext context) {
double height = (MediaQuery.of(context).size.height) - kRadialReactionRadius - kToolbarHeight;
return new Container(
height: height,
padding: new EdgeInsets.all(10.0),
child: new Card(
elevation: 10.0,
child:
new Column(
mainAxisSize: MainAxisSize.max,
mainAxisAlignment: MainAxisAlignment.spaceBetween,
children: <Widget>[
new Column(crossAxisAlignment: CrossAxisAlignment.start,
children: <Widget>[
new ListTile(
title: new Center(child: new Text('VENDAS POR PRODUTOS', style: new TextStyle(fontWeight: FontWeight.bold))),
subtitle: new Center(child: new Padding(padding: new EdgeInsets.only(top: 5.0), child:
new Text('Top 3 produtos dos ultimos 30 dias', textAlign: TextAlign.center,))),
),
new FutureBuilder<List<RelatorioProdutos>>(
future: fetchRelatorioPorProduto(new http.Client(),'$dateInicial', '$dateFinal'),
builder: (context, snapshot) {
if (snapshot.hasError) print(snapshot.error)
;else
auxTelaDetalhada = RelatorioVendasTotalizadasProdutos(prods: snapshot.data, aondeVoltar: 0,);
return snapshot.hasData
? new porProdutoList(listas: snapshot.data)
: new Center(child: new RefreshProgressIndicator());
},
),
],),
new Column(crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
new Padding(padding: new EdgeInsets.only(bottom: 15.0),
child: new RaisedButton(
child: new Text("Ver Relatório Completo",
style: new TextStyle(color: Colors.white, fontSize: 20.0),),
color: Colors.blue,
elevation: 8.0,
splashColor: Colors.lightBlue,
onPressed: () {
setState(() {
});
// Navigator.pushReplacement(
// context,
// new MaterialPageRoute(builder: (context) => auxTelaDetalhada),
// );
},
),
),
]),]
),
),
);
}
}
在另一个地方，当按下最后一个按钮时，它可以工作，但是我想在第一个if（在其他类中）输入时重新构建它。