72 lines
2.3 KiB
Dart
72 lines
2.3 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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final Settings settings = Settings._private();
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typedef void SettingsCallback(String key, dynamic oldValue, dynamic newValue);
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class Settings {
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static SharedPreferences prefs;
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ObserverList<SettingsCallback> _listeners = ObserverList<SettingsCallback>();
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Settings._private();
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// preferences
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static const infoMapZoomKey = 'info_map_zoom';
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init() async {
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prefs = await SharedPreferences.getInstance();
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}
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void addListener(SettingsCallback listener) => _listeners.add(listener);
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void removeListener(SettingsCallback listener) => _listeners.remove(listener);
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void notifyListeners(String key, dynamic oldValue, dynamic newValue) {
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debugPrint('$runtimeType notifyListeners key=$key, old=$oldValue, new=$newValue');
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if (_listeners != null) {
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final List<SettingsCallback> localListeners = _listeners.toList();
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for (SettingsCallback listener in localListeners) {
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try {
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if (_listeners.contains(listener)) {
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listener(key, oldValue, newValue);
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}
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} catch (exception, stack) {
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debugPrint('$runtimeType failed to notify listeners with exception=$exception\n$stack');
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}
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}
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}
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}
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double get infoMapZoom => prefs.getDouble(infoMapZoomKey) ?? 12;
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set infoMapZoom(double newValue) => setAndNotify(infoMapZoomKey, newValue);
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// convenience methods
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bool getBoolOrDefault(String key, bool defaultValue) => prefs.getKeys().contains(key) ? prefs.getBool(key) : defaultValue;
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setAndNotify(String key, dynamic newValue) {
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var oldValue = prefs.get(key);
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if (newValue == null) {
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prefs.remove(key);
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} else if (newValue is String) {
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oldValue = prefs.getString(key);
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prefs.setString(key, newValue);
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} else if (newValue is int) {
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oldValue = prefs.getInt(key);
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prefs.setInt(key, newValue);
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} else if (newValue is double) {
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oldValue = prefs.getDouble(key);
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prefs.setDouble(key, newValue);
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} else if (newValue is bool) {
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oldValue = prefs.getBool(key);
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prefs.setBool(key, newValue);
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}
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if (oldValue != newValue) {
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notifyListeners(key, oldValue, newValue);
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}
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}
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}
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