Flutter 在通过构造函数传递计算出的double以及再次设置状态以在flift中运行UI方面存在问题
我开发了一个简单的FD计算器应用程序，在您输入基本详细信息后生成金额，我有一个饼图类，我想在单击calculate按钮时触发它，但由于某些原因，代码只运行一个，它只接受构造函数的参数，并且始终保持不变，这是一个动画饼图，我已经发布了两个类，一个是主屏幕，另一个是动画饼图，我是新手，所以如果你能帮我用我的计算按钮完全控制饼图状态，那将是很大的帮助，谢谢 图表代码Flutter 在通过构造函数传递计算出的double以及再次设置状态以在flift中运行UI方面存在问题,flutter,setstate,Flutter,Setstate,我开发了一个简单的FD计算器应用程序，在您输入基本详细信息后生成金额，我有一个饼图类，我想在单击calculate按钮时触发它，但由于某些原因，代码只运行一个，它只接受构造函数的参数，并且始终保持不变，这是一个动画饼图，我已经发布了两个类，一个是主屏幕，另一个是动画饼图，我是新手，所以如果你能帮我用我的计算按钮完全控制饼图状态，那将是很大的帮助，谢谢 图表代码 class _PieChartState extends State<PieChart> { final
class _PieChartState extends State<PieChart> {
final double interestPercentage;
final double principalPercentage;
_PieChartState({this.interestPercentage,this.principalPercentage});
Task task;
List<charts.Series<Task,String>>_seriesPieData;
_generateData(){
setState(() {
var pieData=[
Task(task:'Principle',taskValue:interestPercentage,taskColor:Color(0xFF00897B),),
Task(task:'Interest',taskValue:principalPercentage,taskColor:Color(0xff7FC4F4),),
];
_seriesPieData.add(
charts.Series(
data: pieData,
domainFn: (Task task,__)=>task.task,
measureFn: (Task task,__)=>task.taskValue,
colorFn: (Task task,__)=> charts.ColorUtil.fromDartColor(task.taskColor),
id: 'Fd Interest',
labelAccessorFn:(Task row,_)=>'${row.taskValue}\%',
),
);
});
}
@override
void initState() {
super.initState();
_seriesPieData=List<charts.Series<Task,String>>();
_generateData();
}
@override
Widget build(BuildContext context) {
return Container(
child:Expanded(
child: charts.PieChart(
_seriesPieData,
animate: true,
animationDuration: Duration(seconds: 1),
defaultRenderer: new charts.ArcRendererConfig(
arcWidth: 110,
arcRendererDecorators: [
new charts.ArcLabelDecorator(
labelPosition: charts.ArcLabelPosition.inside)
])),
) ,
);
}
}
class Task{
String task;
double taskValue;
Color taskColor;
Task({this.task,this.taskColor,this.taskValue});
}
child: FlatButton(
height: 50,
shape: RoundedRectangleBorder(borderRadius: BorderRadius.all(Radius.circular(26))),
onPressed: (){
switch(animationController.status){
case AnimationStatus.completed:
animationController.reset();
animationController.forward();
break;
case AnimationStatus.dismissed:
animationController.forward();
break;
}
setState(() {
_checker=true;
this.answer=calculate();
this.finiteInterest=finalInterest();
this.interestPercentage=percentageThrower();
this.principalPercentage=100-this.interestPercentage;
});
}, child: Text('Calculate',style: TextStyle(color: Colors.white),)
),
),
Container(
decoration: BoxDecoration(
shape: BoxShape.circle,
boxShadow: [
BoxShadow(
color: Colors.blue.withOpacity(0.7),
offset: Offset(5,5),
spreadRadius: 2,
blurRadius: 8,
),
BoxShadow(
color: Colors.blue.withOpacity(0.0),
offset: Offset(-5,-5),
spreadRadius: 2,
blurRadius:8,
)
]
),
margin: EdgeInsets.only(left: 15),
child: CircleAvatar(
child: Builder(
builder: (context){
if(_checker== true){
return Center(child: PieChart(interestPercentage:interestPercentage,principalPercentage:principalPercentage));}else{
return Container(color: Colors.white,width: 10,height: 10,);}},
),
radius: 110,
backgroundColor: Colors.white,
),
),
Container(
margin: EdgeInsets.only(top:30,left: 100),
child:SlideTransition(
position:tween,
child: FadeTransition(
opacity: animationController,
child: Container(
child: Container(
padding: EdgeInsets.all(12),
child: Column(
mainAxisAlignment: MainAxisAlignment.start,
children: [
answer_childs(text: "Principle ${totalAmount.text} ",colors: Colors.teal.shade600,),
answer_childs(text: "Interest $finiteInterest",colors: Colors.lightBlue,),
answer_childs(text:"Total Amount $answer",colors: Colors.black,),
],
),
decoration: BoxDecoration(
color: Colors.white,
borderRadius: BorderRadius.only(topLeft:Radius.circular(18),bottomLeft:Radius.circular(18) ),
),
),
width: 350,
height: 100,
color: Colors.blue.withOpacity(0.0),
)
),
),
),
],
),
);
}
String calculate(){
double amount;
double principal;
int termN;
double interestN;
principal= double.parse(totalAmount.text);
termN= int.parse(term.text);
interestN=double.parse(interest.text);
amount = principal*(pow(1+(interestN/100), termN));
amount=amount-amount%1;
return '$amount';
}
double finalInterest(){
double amount;double principal;int termN; double finalInterest;double interestN;
principal= double.parse(totalAmount.text);
termN= int.parse(term.text);
interestN=double.parse(interest.text);
amount = principal*(pow(1+(interestN/100), termN));
amount=amount-amount%1;
finalInterest=amount-principal;
finalInterest=finalInterest-finalInterest%1;
return finalInterest;
}
double percentageThrower(){
double interestPercentage;double principal;
principal= double.parse(totalAmount.text);
interestPercentage=finalInterest();
interestPercentage=(interestPercentage/principal)*100;
return interestPercentage;
}
}