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Merge pull request #164 from PSDTools/gpa
GPA Calculation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| import "package:riverpod_annotation/riverpod_annotation.dart"; | ||
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| import "gpa_model.dart"; | ||
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| part "gpa_domain.g.dart"; | ||
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| /// Get the state for the GPA calculator. | ||
| @riverpod | ||
| class Gpa extends _$Gpa { | ||
| @override | ||
| Course build(int hour) { | ||
| return Course(hour: hour, grade: _defaultGrade); | ||
| } | ||
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| final _defaultGrade = const LetterGrade.a(); | ||
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| /// Update the course's grade. | ||
| void updateGrade(LetterGrade? grade) { | ||
| state = state.copyWith(grade: grade ?? _defaultGrade); | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| import "package:freezed_annotation/freezed_annotation.dart"; | ||
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| part "gpa_model.freezed.dart"; | ||
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| /// A course. | ||
| @freezed | ||
| @immutable | ||
| sealed class Course with _$Course { | ||
| /// Create a new, immutable instance of [Course]. | ||
| const factory Course({ | ||
| /// The hour the course takes place. | ||
| required int hour, | ||
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| // /// The name of the course. | ||
| // required String name, | ||
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| /// The grade of the course. | ||
| required LetterGrade grade, | ||
| }) = _Course; | ||
| } | ||
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| /// A grade. | ||
| sealed class LetterGrade { | ||
| /// An 'A'. | ||
| const factory LetterGrade.a({bool isHonors}) = _A; | ||
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| /// A 'B'. | ||
| const factory LetterGrade.b({bool isHonors}) = _B; | ||
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| /// A 'C'. | ||
| const factory LetterGrade.c({bool isHonors}) = _C; | ||
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| /// A 'D'. | ||
| const factory LetterGrade.d({bool isHonors}) = _D; | ||
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| /// An 'F'. | ||
| const factory LetterGrade.f({bool isHonors}) = _F; | ||
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| /// The GPA value for the letter grade. | ||
| int get value; | ||
| } | ||
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| /// An 'A'. | ||
| @freezed | ||
| @immutable | ||
| class _A with _$_A implements LetterGrade { | ||
| /// Create a new, immutable [LetterGrade.a]. | ||
| const factory _A({ | ||
| @Default(false) bool isHonors, | ||
| }) = __A; | ||
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| const _A._(); | ||
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| @override | ||
| int get value => isHonors ? 5 : 4; | ||
| } | ||
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| /// A 'B'. | ||
| @freezed | ||
| @immutable | ||
| class _B with _$_B implements LetterGrade { | ||
| /// Create a new, immutable [LetterGrade.b]. | ||
| const factory _B({ | ||
| @Default(false) bool isHonors, | ||
| }) = __B; | ||
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| const _B._(); | ||
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| @override | ||
| int get value => isHonors ? 4 : 3; | ||
| } | ||
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| /// A 'C'. | ||
| @freezed | ||
| @immutable | ||
| class _C with _$_C implements LetterGrade { | ||
| /// Create a new, immutable [LetterGrade.c]. | ||
| const factory _C({ | ||
| @Default(false) bool isHonors, | ||
| }) = __C; | ||
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| const _C._(); | ||
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| @override | ||
| int get value => isHonors ? 3 : 2; | ||
| } | ||
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| /// A 'D'. | ||
| @freezed | ||
| @immutable | ||
| class _D with _$_D implements LetterGrade { | ||
| /// Create a new, immutable [LetterGrade.d]. | ||
| const factory _D({ | ||
| @Default(false) bool isHonors, | ||
| }) = __D; | ||
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| const _D._(); | ||
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| @override | ||
| int get value => 1; | ||
| } | ||
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| /// An 'F'. | ||
| @freezed | ||
| @immutable | ||
| class _F with _$_F implements LetterGrade { | ||
| /// Create a new, immutable [LetterGrade.f]. | ||
| const factory _F({ | ||
| @Default(false) bool isHonors, | ||
| }) = __F; | ||
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| const _F._(); | ||
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| @override | ||
| int get value => 0; | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,100 @@ | ||
| /// The auth feature. | ||
| library; | ||
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| import "package:auto_route/auto_route.dart"; | ||
| import "package:flutter/material.dart"; | ||
| import "package:flutter_riverpod/flutter_riverpod.dart"; | ||
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| import "../domain/gpa_domain.dart"; | ||
| import "../domain/gpa_model.dart"; | ||
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| /// The page located at `/login/` | ||
| @RoutePage() | ||
| class GpaPage extends ConsumerStatefulWidget { | ||
| /// Create a new instance of [GpaPage]. | ||
| const GpaPage({super.key}); | ||
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| @override | ||
| ConsumerState<GpaPage> createState() => _GpaPageState(); | ||
| } | ||
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| class _GpaPageState extends ConsumerState<GpaPage> { | ||
| final _formKey = GlobalKey<FormState>(); | ||
| final _hours = 7; | ||
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| @override | ||
| Widget build(BuildContext context) { | ||
| return Center( | ||
| child: Column( | ||
| mainAxisAlignment: MainAxisAlignment.center, | ||
| children: [ | ||
| SizedBox( | ||
| width: 300, | ||
| child: Form( | ||
| key: _formKey, | ||
| child: Column( | ||
| children: [ | ||
| for (var hour = 0; hour < _hours; hour++) | ||
| Dropdown( | ||
| hour: hour, | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| ), | ||
| ElevatedButton( | ||
| onPressed: () { | ||
| if (_formKey.currentState?.validate.call() ?? false) { | ||
| var total = 0; | ||
| for (var hour = 0; hour < _hours; hour++) { | ||
| final grade = ref.read(gpaProvider(hour)).grade; | ||
| total += grade.value; | ||
| } | ||
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| final gpa = total / _hours; | ||
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| // TODO(lishaduck): Add an extension on context. | ||
| ScaffoldMessenger.of(context).showSnackBar( | ||
| SnackBar(content: Text("Calculated GPA: $gpa")), | ||
| ); | ||
| } | ||
| }, | ||
| child: const Text("Calculate GPA"), | ||
| ), | ||
| ], | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
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| /// Dropdown widget for picking your letter grade. | ||
| class Dropdown extends ConsumerStatefulWidget { | ||
| /// Create a new instance of [Dropdown]. | ||
| const Dropdown({required this.hour, super.key}); | ||
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| /// The hour the course is taken. | ||
| final int hour; | ||
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| @override | ||
| ConsumerState<Dropdown> createState() => _DropdownState(); | ||
| } | ||
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| class _DropdownState extends ConsumerState<Dropdown> { | ||
| @override | ||
| Widget build(BuildContext context) { | ||
| final value = ref.watch(gpaProvider(widget.hour)); | ||
| final valueNotifier = ref.watch(gpaProvider(widget.hour).notifier); | ||
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| return DropdownButtonFormField( | ||
| value: value.grade, | ||
| items: const [ | ||
| DropdownMenuItem(value: LetterGrade.a(), child: Text("A")), | ||
| DropdownMenuItem(value: LetterGrade.b(), child: Text("B")), | ||
| DropdownMenuItem(value: LetterGrade.c(), child: Text("C")), | ||
| DropdownMenuItem(value: LetterGrade.d(), child: Text("D")), | ||
| DropdownMenuItem(value: LetterGrade.f(), child: Text("F")), | ||
| ], | ||
| onChanged: valueNotifier.updateGrade, | ||
| ); | ||
| } | ||
| } |
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