flutterのdartで作った電卓で小数点0.01が入力できない
解決したいこと
flutterで作った電卓で小数点0.01が入力できない
flitterのdartで電卓アプリを作成しています。
小数点の計算をしようと思い0.01と入力したいのですが、うまく出力されません例えば1 ÷ 100をしたら0.01と表示はされます。何か解決策があれば教えてほしいです。
または、問題・エラーが起きている画像をここにドラッグアンドドロップ
該当するソースコード
import 'package:flutter/material.dart';
import 'dart:math' as Math;
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Flutter Demo',
theme: ThemeData(
primarySwatch: Colors.pink,
),
home: MyHomePage(title: 'calc app'),
);
}
}
class MyHomePage extends StatefulWidget {
MyHomePage({super.key, required this.title});
final String title;
@override
_MyHomePageState createState() => _MyHomePageState();
}
//演算子の型
enum CALC_TYPE { add, sub, multi, div }
class _MyHomePageState extends State<MyHomePage> {
double _setNumber = 0;//数字ボタン押されたときに受け取る変数
double _displayNumber = 0;//表示させる変数
double _firstNum = 0;//最初に押された数値を裏で保持しとく変数
CALC_TYPE? _calcType;//演算子を四つ格納された変数
int _displayPow = 0;//桁は触れしたとき平方根を表示する
bool _decimalFlag = false;
//数字のボタン押されたときに動くやつ
void _setNum(double num) {
_displayPow = 0;
if (_displayNumber == _setNumber) {
if (1000000000 > _displayNumber) {
setState(() {
if (!_decimalFlag)
_displayNumber = _displayNumber * 10 + num;
else {
int count = 1;
for (int i = 0;
_displayNumber * Math.pow(10, i) !=
(_displayNumber * Math.pow(10, i)).ceil();
i++) {
count++;
}
_displayNumber = double.parse(
(_displayNumber + (num / Math.pow(10, count)))
.toStringAsFixed(count));
_checkDecimal();
}
_setNumber = _displayNumber;
});
}
} else {
setState(() {
_displayNumber = num;
_setNumber = _displayNumber;
_calcType = null;
});
}
}
//演算子が押された後の画面と裏で保持させる命令
void _calcBtnPressed(CALC_TYPE type) {
_setNumber = _displayNumber;//押された数字を表示
_firstNum = _setNumber;//最初に入力した数値を保持
_setNumber = 0;//二番目に入力する数値をいったん0
_displayNumber = 0;//二番目に入力する前に0と表示
_calcType = type;//
_decimalFlag = false;
}
//足し算の処理
void _calcAdd() {
setState(() {
_displayNumber = _firstNum + _setNumber;
_checkDecimal();
_firstNum = _displayNumber;
});
}
//引き算の処理
void _calcSub() {
setState(() {
_displayNumber = _firstNum - _setNumber;
_checkDecimal();
_firstNum = _displayNumber;
});
}
//掛け算の処理
void _calcMulti() {
setState(() {
_displayNumber = _firstNum * _setNumber;
_checkDecimal();
_firstNum = _displayNumber;
});
}
//割り算の処理
void _calcDiv() {
setState(() {
if (_displayNumber == 0 && _firstNum == 0 && _setNumber == 0) {
_displayNumber = (double.parse('Infinity'));
_firstNum = (double.parse('Infinity'));
_setNumber = (double.parse('Infinity'));
} else {
_displayNumber = _firstNum / _setNumber;
}
_checkDecimal();
_firstNum = _displayNumber;
});
}
void _invertedNum() {
setState(() {
_displayNumber = -_displayNumber;
_setNumber = -_setNumber;
});
}
//桁あふれ対応
void _checkDecimal() {
double checkNum = _displayNumber;
if (1000000000 < _displayNumber ||
_displayNumber == _displayNumber.toInt()) {
for (int i = 0; 1000000000 < _displayNumber / Math.pow(10, i); i++) {
_displayPow = i;
checkNum = checkNum / 10;
}
//小数点は切り捨て
_displayNumber = checkNum.floor().toDouble();
} else {
int count = 0;
for (int i = 0; 1 < _displayNumber / Math.pow(10, i); i++) {
count = i;
}
int displayCount = 9 - count;
_displayNumber =
double.parse(_displayNumber.toStringAsFixed(displayCount));
}
}
//クリアした時の処理
void _clearNum() {
setState(() {
_setNumber = 0;
_displayNumber = 0;
_firstNum = 0;
_calcType = null;
_displayPow = 0;
_decimalFlag = false;
});
}
void _clearEntryNum() {
setState(() {
_setNumber = 0;
_displayNumber = 0;
_displayPow = 0;
_decimalFlag = false;
});
}
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: Text(widget.title),
),
//ボタンの領域＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
body: Column(
crossAxisAlignment: CrossAxisAlignment.end,
children: <Widget>[
Container(
height: 20,
child: _displayPow > 0
? Text(
"10^${_displayPow.toString()}",
style: TextStyle(
fontSize: 20,
),
)
: Container(),
),
Text( //_displayNumberを表示させる
_displayNumber == _displayNumber.toInt()//例1.0と1は等しいですか
? _displayNumber.toInt().toString()
: _displayNumber.toString(),
style: TextStyle(
fontSize: 60,
),
),
Expanded(
child: Column(
children: <Widget>[
Expanded(
child: Row(
children: <Widget>[
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_clearEntryNum();
},
child: Text(
"btn",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_clearEntryNum();
},
child: Text(
"AC",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_clearNum();
},
child: Text(
"C",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_calcBtnPressed(CALC_TYPE.div);
},
child: Text(
"÷",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
],
),
),
Expanded(
child: Row(
children: <Widget>[
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(7);
},
child: Text(
"7",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(8);
},
child: Text(
"8",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(9);
},
child: Text(
"9",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_calcBtnPressed(CALC_TYPE.multi);
},
child: Text(
"×",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
],
),
),
Expanded(
child: Row(
children: <Widget>[
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(4);
},
child: Text(
"4",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(5);
},
child: Text(
"5",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(6);
},
child: Text(
"6",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_calcBtnPressed(CALC_TYPE.sub);
},
child: Text(
"-",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
],
),
),
Expanded(
child: Row(
children: <Widget>[
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(1);
},
child: Text(
"1",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(2);
},
child: Text(
"2",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(3);
},
child: Text(
"3",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_calcBtnPressed(CALC_TYPE.add);
},
child: Text(
"+",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
],
),
),
Expanded(
child: Row(
children: <Widget>[
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_invertedNum();
},
child: Text(
"+/-",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_setNum(0);
},
child: Text(
"0",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
_decimalFlag = true;
},
child: Text(
".",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
Expanded(
child: SizedBox(
width: double.infinity,
height: double.infinity,
child: TextButton(
onPressed: () {
//押された演算子を判別させ、その処理を条件によって分ける
switch (_calcType) {
case CALC_TYPE.add:
_calcAdd();
break;
case CALC_TYPE.sub:
_calcSub();
break;
case CALC_TYPE.multi:
_calcMulti();
break;
case CALC_TYPE.div:
_calcDiv();
break;
default:
break;
}
},
child: Text(
"=",
textAlign: TextAlign.center,
style: TextStyle(
fontSize: 40,
),
),
),
),
),
],
),
),
],
),
),
],
),
//ボタンの領域==================================================================================================
);
}
}
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