AndrewTrieu/flutter-calculator
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Andrew
2022-11-25 08:17:04 +02:00
commit 19e01d5564
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import 'package:flutter/material.dart';
void main() {
runApp(const Calculator());
}
class Calculator extends StatefulWidget {
const Calculator({Key? key}) : super(key: key);
@override
_CalculatorState createState() => _CalculatorState();
}
class _CalculatorState extends State<Calculator> {
late double first = 0;
late double second = 0;
late String output = '0.00';
late String _output = '0';
late String operand = '0';
void click(String input) {
try {
if (input == "Clear") {
first = 0;
second = 0;
_output = '0';
operand = '0';
} else if (input == "+/-") {
if (_output[0] != "-") {
_output = "-" + _output;
} else {
_output = _output.substring(1);
}
} else if (input == "+" || input == "—" || input == "x" || input == "÷") {
first = double.parse(output);
operand = input;
_output = '0';
} else if (input == ".") {
if (_output.contains(".")) {
print("Decimal error.");
return;
} else {
_output = _output + input;
}
} else if (input == "=") {
second = double.parse(output);
if (operand == "+") {
_output = (first + second).toString();
} else if (operand == "—") {
_output = (first - second).toString();
} else if (operand == "x") {
_output = (first * second).toString();
} else if (operand == "÷") {
_output = (first / second).toString();
}
first = 0.0;
second = 0.0;
operand = "";
} else {
_output = _output + input;
}
print(_output);
setState(() {
output = double.parse(_output).toStringAsFixed(2);
});
} catch (e) {
print(e);
first = 0;
second = 0;
_output = '0';
operand = '0';
return;
}
}
@override
Widget build(BuildContext context) {
return MaterialApp(
debugShowCheckedModeBanner: false,
title: "Calculator",
theme: ThemeData(primarySwatch: Colors.brown),
home: Scaffold(
appBar: AppBar(
title: Text("CALCULATOR"),
),
backgroundColor: Color(0xFF1C1C1C),
body: Container(
child: Column(
mainAxisAlignment: MainAxisAlignment.end,
children: [
Container(
child: Padding(
padding: EdgeInsets.only(right: 15, bottom: 10),
child: FittedBox(
fit: BoxFit.fitWidth,
child: Text(
output,
style: TextStyle(
fontSize: 80,
color: Color(0xFFFFFFFF),
),
),
),
),
alignment: Alignment(1.0, 1.0),
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
WideButton(
text: "Clear",
buttonColor: 0xFFD4D4D2,
fontColor: 0xFF1C1C1C,
size: 24,
press: click,
),
Button(
text: "+/-",
buttonColor: 0xFFD4D4D2,
fontColor: 0xFF1C1C1C,
size: 24,
press: click,
),
Button(
text: "÷",
buttonColor: 0xFFFF9500,
fontColor: 0xFFFFFFFF,
size: 26,
press: click,
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Button(
text: "7",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "8",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "9",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "x",
buttonColor: 0xFFFF9500,
fontColor: 0xFFFFFFFF,
size: 26,
press: click,
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Button(
text: "4",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "5",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "6",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "—",
buttonColor: 0xFFFF9500,
fontColor: 0xFFFFFFFF,
size: 26,
press: click,
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Button(
text: "1",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "2",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "3",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "+",
buttonColor: 0xFFFF9500,
fontColor: 0xFFFFFFFF,
size: 26,
press: click,
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.spaceEvenly,
children: [
Button(
text: "0",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "00",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: ".",
buttonColor: 0xff505050,
fontColor: 0xFFFFFFFF,
size: 24,
press: click,
),
Button(
text: "=",
buttonColor: 0xFFFF9500,
fontColor: 0xFFFFFFFF,
size: 26,
press: click,
),
],
),
],
),
),
),
);
}
}
class Button extends StatelessWidget {
final String text;
final int buttonColor;
final int fontColor;
final double size;
final Function press;
const Button({
required this.text,
required this.buttonColor,
required this.fontColor,
required this.size,
required this.press,
});
@override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.all(10),
child: SizedBox(
width: 70,
height: 70,
child: FlatButton(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(30.0),
),
child: Text(
text,
style: TextStyle(
fontSize: size,
),
),
onPressed: () {
press(text);
},
color: Color(buttonColor),
textColor: Color(fontColor),
),
),
);
}
}
class WideButton extends StatelessWidget {
final String text;
final int buttonColor;
final int fontColor;
final double size;
final Function press;
const WideButton({
required this.text,
required this.buttonColor,
required this.fontColor,
required this.size,
required this.press,
});
@override
Widget build(BuildContext context) {
return Container(
margin: EdgeInsets.all(10),
child: SizedBox(
width: 170,
height: 70,
child: FlatButton(
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(30.0),
),
child: Text(
text,
style: TextStyle(
fontSize: size,
),
),
onPressed: () {
press(text);
},
color: Color(buttonColor),
textColor: Color(fontColor),
),
),
);
}
}