383 lines
10 KiB
Dart
383 lines
10 KiB
Dart
import 'package:flutter/material.dart';
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enum Operation {
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plus,
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minus,
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multi,
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div,
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point,
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res,
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percent,
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plusMinus,
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backspace,
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clear
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}
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extension OperationExtension on Operation {
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String getString() {
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switch (this) {
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case Operation.plus:
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return "+";
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case Operation.minus:
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return "-";
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case Operation.multi:
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return "x";
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case Operation.div:
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return "÷";
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case Operation.point:
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return ".";
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case Operation.res:
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return "=";
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default:
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throw UnimplementedError();
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}
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}
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}
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enum Numbers { zero, one, two, three, four, five, six, seven, eight, nine }
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extension NumbersExtension on num {
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num backspace() {
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String pull = "$this";
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pull = pull.substring(0, pull.length - 1);
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if (pull.isNotEmpty && pull.split('').last.contains('.')) {
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pull = pull.substring(0, pull.length - 1);
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}
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return num.parse(pull, (pull) => 0);
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}
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num concat({bool pointer, int value}) {
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if (pointer == true) {
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final String pull = "${this}." + "$value";
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return num.parse(pull);
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} else {
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final String pull = "$this" + "$value";
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return num.parse(pull);
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}
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}
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}
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void main() {
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runApp(MyApp());
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}
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class MyApp extends StatelessWidget {
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// This widget is the root of your application.
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@override
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Widget build(BuildContext context) {
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return MaterialApp(
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title: 'Calculator',
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theme: ThemeData(
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primarySwatch: Colors.blue,
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visualDensity: VisualDensity.adaptivePlatformDensity,
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),
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home: const MyHomePage(title: 'Calculator'),
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);
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}
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}
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class MyHomePage extends StatefulWidget {
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const MyHomePage({Key key, this.title}) : super(key: key);
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final String title;
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@override
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_MyHomePageState createState() => _MyHomePageState();
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}
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class _MyHomePageState extends State<MyHomePage> {
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num a, b;
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bool pointStatus;
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dynamic operator;
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String textResh = "0";
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void getCalc(dynamic type) {
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if (type is Numbers) {
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if (a == null) {
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a = type.index;
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setState(() {
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textResh = '$a';
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});
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} else if (a != null && operator == null) {
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if (pointStatus == true) {
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a = a.concat(pointer: true, value: type.index);
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pointStatus = false;
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} else {
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a = a.concat(pointer: false, value: type.index);
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}
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setState(() {
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textResh = '$a';
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});
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} else if (operator != null) {
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if (b == null) {
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b = type.index;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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} else if (b != null) {
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if (pointStatus == true) {
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b = b.concat(pointer: true, value: type.index);
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pointStatus = false;
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} else {
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b = b.concat(pointer: false, value: type.index);
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}
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pointStatus = false;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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}
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}
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} else if (type is Operation) {
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if (type == Operation.res) {
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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a = operationEvent(a, b, operator as Operation);
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b = null;
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operator = null;
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setState(() {
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textResh = "$a";
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});
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} else if (type == Operation.point) {
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if (a != null && b == null) {
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if (a is double) {
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pointStatus = false;
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setState(() {
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textResh = "$a";
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});
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} else {
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pointStatus = true;
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setState(() {
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textResh = "$a.";
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});
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}
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} else {
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if (b is double) {
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pointStatus = false;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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} else {
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pointStatus = true;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b.";
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});
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}
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}
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} else if (type == Operation.clear) {
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a = 0;
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b = null;
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operator = null;
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setState(() {
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textResh = "$a";
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});
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} else if (type == Operation.backspace) {
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if (a != null && b == null) {
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a = a.backspace();
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setState(() {
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textResh = "$a";
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});
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} else {
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b = b.backspace();
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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}
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} else if (type == Operation.plusMinus) {
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if (a != null && b == null) {
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a = a * -1;
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setState(() {
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textResh = "$a";
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});
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} else {
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b = b * -1;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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}
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} else if (type == Operation.percent) {
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if (a != null && b == null) {
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a = a / 100;
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setState(() {
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textResh = "$a";
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});
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} else {
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b = b / 100;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()} $b";
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});
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}
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} else {
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operator = type;
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setState(() {
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textResh = "$a ${(operator as Operation).getString()}";
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});
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}
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}
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}
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num operationEvent(num x, num y, Operation op) {
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num result = 0;
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switch (op) {
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case Operation.plus:
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result = x + y;
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break;
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case Operation.minus:
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result = x - y;
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break;
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case Operation.multi:
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result = x * y;
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break;
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case Operation.div:
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result = x / y;
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break;
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default:
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result = 0;
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break;
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}
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if (result % 1 == 0) {
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return result.toInt();
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} else {
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return result;
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(widget.title),
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),
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body: Container(
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color: const Color(0xFF4b44cf),
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child: Padding(
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padding: const EdgeInsets.all(8.0),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Expanded(
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child: Align(
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alignment: Alignment.centerRight,
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child: Text(
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textResh,
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style: const TextStyle(fontSize: 80, color: Colors.white),
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),
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),
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),
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Row(
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children: [
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CallButton(
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text: "±",
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value: Operation.plusMinus,
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onPressed: getCalc,
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),
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CallButton(
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text: "%",
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value: Operation.percent,
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onPressed: getCalc),
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CallButton(
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text: "⌫",
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value: Operation.backspace,
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onPressed: getCalc),
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CallButton(
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text: "AC", value: Operation.clear, onPressed: getCalc),
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],
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),
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Row(
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children: [
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CallButton(
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text: "7",
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value: Numbers.seven,
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onPressed: getCalc,
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),
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CallButton(
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text: "8", value: Numbers.eight, onPressed: getCalc),
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CallButton(
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text: "9", value: Numbers.nine, onPressed: getCalc),
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CallButton(
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text: "/", value: Operation.div, onPressed: getCalc),
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],
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),
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Row(
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children: [
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CallButton(
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text: "4", value: Numbers.four, onPressed: getCalc),
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CallButton(
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text: "5", value: Numbers.five, onPressed: getCalc),
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CallButton(
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text: "6", value: Numbers.six, onPressed: getCalc),
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CallButton(
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text: "*", value: Operation.multi, onPressed: getCalc),
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],
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),
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Row(
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children: [
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CallButton(
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text: "1", value: Numbers.one, onPressed: getCalc),
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CallButton(
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text: "2", value: Numbers.two, onPressed: getCalc),
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CallButton(
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text: "3", value: Numbers.three, onPressed: getCalc),
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CallButton(
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text: "-", value: Operation.minus, onPressed: getCalc),
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],
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),
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Row(
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children: [
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CallButton(
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text: "0", value: Numbers.zero, onPressed: getCalc),
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CallButton(
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text: ".", value: Operation.point, onPressed: getCalc),
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CallButton(
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text: "=", value: Operation.res, onPressed: getCalc),
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CallButton(
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text: "+",
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value: Operation.plus,
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onPressed: getCalc,
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),
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],
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),
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],
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),
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),
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));
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}
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}
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class CallButton extends StatelessWidget {
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final String text;
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final dynamic value;
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final void Function(dynamic) onPressed;
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const CallButton(
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{@required this.text, @required this.value, @required this.onPressed});
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@override
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Widget build(BuildContext context) {
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return Expanded(
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child: Padding(
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padding: const EdgeInsets.all(2.0),
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child: Container(
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clipBehavior: Clip.antiAlias,
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width: 100,
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(12),
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color: const Color(0xE0E0E0E0)),
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child: FlatButton(
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height: 60,
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onPressed: () => onPressed(value),
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child: Text(
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text,
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style: TextStyle(fontSize: 40, color: Colors.blue[900]),
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),
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),
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),
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),
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);
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}
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}
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