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Markus Bittner: Calc stuff #1

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Markus Bittner: Calc stuff #1

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0d5dbb8
Calc stuff
sukramAxians Jan 20, 2023
9f9fc70
Added ^ because why not...
sukramAxians Jan 20, 2023
913aa20
Test and refactoring
sukramAxians Jan 20, 2023
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114 changes: 111 additions & 3 deletions 001_calculator/lib/feature/calculator/calculator_cubit.dart
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Original file line number Diff line number Diff line change
@@ -1,14 +1,122 @@
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:function_tree/function_tree.dart';

/// The state of the calculator
class CalculatorState {
// TODO(dkbast): implement state
abstract class CalculatorState {

/// lala
String get display => '0';
}

/// The reset state
class ResetState extends CalculatorState {}

/// The display update state
class UpdateDisplayState extends CalculatorState {

/// lala
UpdateDisplayState({required this.display});

/// lalal
@override
String display;
}

/// The reset state
class DivideByZeroState extends CalculatorState {
@override
String get display => 'lala';
}

/// The business logic of the calculator
class CalculatorCubit extends Cubit<CalculatorState> {
/// The business logic of the calculator
CalculatorCubit() : super(CalculatorState());
CalculatorCubit() : super(ResetState());

/// number
String number = '0';

// TODO(dkbast): implement cubit
/// do something
void doSomethingWithKey(String key) {
switch (key) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '.':
addNumber(key);
break;
case 'C':
resetDisplay();
break;
case '+':
case '-':
case '/':
case '*':
case '^':
addOperator(key);
break;
case '=':
calculateStuff(key);
break;
case '+/-':
toggleSign();
break;
default:
break;
}
}

void _updateDisplayState() {
emit(UpdateDisplayState(display: number));
}

/// lala
void toggleSign() {
if (number.startsWith('-')) {
number = number.replaceFirst('-', '');
} else {
number = '-$number';
}
_updateDisplayState();
}

/// Adds number i swear
void addNumber(String number) {
if (this.number == '0' && number == '0') {
return;
}

if (this.number == '0') {
this.number = number;
} else {
this.number += number;
}
_updateDisplayState();
}

/// lala
void calculateStuff(String operator) {
number = number.interpret().toString();
_updateDisplayState();
}

/// Lala
void addOperator(String operator) {
number += operator;
_updateDisplayState();
}

/// resets display
void resetDisplay() {
number = '0';
emit(ResetState());
}
}
245 changes: 125 additions & 120 deletions 001_calculator/lib/feature/calculator/calculator_view.dart
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Original file line number Diff line number Diff line change
@@ -1,7 +1,9 @@
// ignore_for_file: library_private_types_in_public_api

import 'package:calculator/feature/calculator/calculator.dart';
import 'package:calculator/feature/calculator/widgets.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';

/// The view of the calculator
/// If a user wants to use the calculator, this is the widget they should use
Expand All @@ -17,137 +19,140 @@ class CalculatorView extends StatefulWidget {
class _CalculatorPageState extends State<CalculatorView> {
@override
Widget build(BuildContext context) {
return Scaffold(
appBar: AppBar(
title: const Text('Calculator'),
),
body: Center(
return BlocProvider<CalculatorCubit>(
create: (context) => CalculatorCubit(),
child: Scaffold(
appBar: AppBar(
title: const Text('Calculator'),
),
body: Center(
// A Column Widget that contains the display and the keypad
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// A Text Widget that displays the current number
Text(
'0',
style: Theme.of(context).textTheme.displayLarge,
),
const _CalculatorDisplay(),
// A Row Widget that contains the keypad
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// A Column Widget that contains the first row of buttons
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
// A Row Widget that contains the first row of buttons
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Button(
text: '7',
onPressed: () {},
),
Button(
text: '8',
onPressed: () {},
),
Button(
text: '9',
onPressed: () {},
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
_CalcButton(text: '7'),
_CalcButton(text: '8'),
_CalcButton(text: '9'),
],
),
// A Row Widget that contains the second row of buttons
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Button(
text: '4',
onPressed: () {},
),
Button(
text: '5',
onPressed: () {},
),
Button(
text: '6',
onPressed: () {},
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
_CalcButton(text: '4'),
_CalcButton(text: '5'),
_CalcButton(text: '6'),
],
),
// A Row Widget that contains the third row of buttons
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Button(
text: '1',
onPressed: () {},
),
Button(
text: '2',
onPressed: () {},
),
Button(
text: '3',
onPressed: () {},
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
_CalcButton(text: '1'),
_CalcButton(text: '2'),
_CalcButton(text: '3'),
],
),
// A Row Widget that contains the fourth row of buttons
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Button(
text: '0',
onPressed: () {},
),
Button(
text: '.',
onPressed: () {},
),
Button(
text: '+/-',
onPressed: () {},
),
],
),
],
),
Row(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
_CalcButton(text: '0'),
_CalcButton(text: '.'),
_CalcButton(text: '+/-'),
],
),
],
),
// A Column Widget that contains the second row of buttons
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: <Widget>[
Button(
text: '+',
onPressed: () {},
),
Button(
text: '-',
onPressed: () {},
),
Button(
text: '*',
onPressed: () {},
),
Button(
text: '/',
onPressed: () {},
),
Button(
text: '=',
onPressed: () {},
),
Button(
text: 'C',
onPressed: () {},
),
],
),
],
),
],
Column(
mainAxisAlignment: MainAxisAlignment.center,
children: const <Widget>[
_CalcButton(
text: '+',
),
_CalcButton(
text: '-',
),
_CalcButton(
text: '*',
),
_CalcButton(
text: '/',
),
_CalcButton(
text: '^',
),
_CalcButton(
text: '=',
),
_CalcButton(
text: 'C',
),
],
),
],
),
],
),
),
),
);
}
}

/// Counter display widget
class _CalculatorDisplay extends StatefulWidget {
/// Contructor
const _CalculatorDisplay({super.key});

@override
State<_CalculatorDisplay> createState() => _CalculatorDisplayState();
}

class _CalculatorDisplayState extends State<_CalculatorDisplay> {
@override
Widget build(BuildContext context) {
return BlocBuilder<CalculatorCubit, CalculatorState>(
builder: (context, state) {
return Text(
key: const ValueKey('CalculatorDisplay'),
state.display,
style: Theme.of(context).textTheme.displayLarge,
);
});
}
}

/// lala
class _CalcButton extends StatelessWidget {
/// lala
const _CalcButton({super.key, required this.text});

/// lala
final String text;

@override
Widget build(BuildContext context) {
return Button(
key: ValueKey(text),
text: text,
onPressed: (text) =>
context.read<CalculatorCubit>().doSomethingWithKey(text),
);
}
}
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