78 lines
1.9 KiB
Dart
78 lines
1.9 KiB
Dart
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import 'dart:convert';
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import 'package:flutter/material.dart';
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import 'package:flutter/services.dart';
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import '../models/conversion_entry.dart';
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class ConverterProvider extends ChangeNotifier {
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List<ConversionEntry> _db = [];
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List<ConversionEntry> _results = [];
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ConversionEntry? _selected;
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double? _grams;
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bool _rawToCooked = true;
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List<ConversionEntry> get results => _results;
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ConversionEntry? get selected => _selected;
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double? get grams => _grams;
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bool get rawToCooked => _rawToCooked;
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double? get result {
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if (_selected == null || _grams == null || _grams! <= 0) return null;
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final v = _rawToCooked
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? _selected!.rawToCooked(_grams!)
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: _selected!.cookedToRaw(_grams!);
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return (v * 10).roundToDouble() / 10;
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}
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Future<void> loadDb() async {
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final raw = await rootBundle.loadString('assets/data/conversions.json');
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final Map<String, dynamic> json = jsonDecode(raw);
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_db = [
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for (final food in json.keys)
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for (final method in (json[food] as Map).keys)
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ConversionEntry(
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food: food,
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method: method,
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yieldFactor:
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(json[food][method]['yield'] as num).toDouble(),
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),
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];
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notifyListeners();
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}
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void search(String q) {
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if (q.trim().isEmpty) {
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_results = [];
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} else {
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final lower = q.toLowerCase();
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_results = _db.where((e) => e.food.contains(lower)).toList();
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}
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notifyListeners();
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}
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void select(ConversionEntry entry) {
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_selected = entry;
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_results = [];
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_grams = null;
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notifyListeners();
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}
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void setGrams(double? value) {
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_grams = value;
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notifyListeners();
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}
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void swapDirection() {
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_rawToCooked = !_rawToCooked;
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_grams = null;
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notifyListeners();
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}
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void reset() {
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_selected = null;
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_results = [];
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_grams = null;
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_rawToCooked = true;
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notifyListeners();
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}
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}
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