load<T> method
Loads a setting from the Theme service, stored with key string.
Implementation
@override
Future<T> load<T>(String key, T defaultValue) async {
try {
if (_debug) {
debugPrint('SharedPrefs has type .......... : $key '
'as ${defaultValue.runtimeType}');
}
// T is boolean nullable value.
if (sameTypes<T, bool?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded type bool? : $key as $value');
if (value == null) {
debugPrint(' Returned as default value : $defaultValue');
}
}
// If value is null, we had no key for it, we should return the
// default value, that may also be null, but it might not be too,
// but it will be of nullable bool type.
if (value == null) return defaultValue;
bool? result;
if (value == 0) result = false;
if (value >= 1) result = true;
return result as T; // Returns null if value was less than zero
}
// T is boolean none nullable value.
if (sameTypes<T, bool>()) {
// For a non nullable, we can just use the defaultValue as fallback if
// a key did not exist.
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded type bool : $key as $value');
if (value == null) {
debugPrint(' Returned as default value : $defaultValue');
}
}
// If value is null, we had no key for it, we should return the
// default value, that always has a value that is never null.
if (value == null) {
return defaultValue;
} else {
bool result;
if (value == 0) {
result = false;
} else {
result = true;
}
return result as T;
}
}
// T is integer nullable value.
if (sameTypes<T, int?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded type int? : $key as $value');
}
// If value is null, we had no key for it, we should return the
// default value, that may also be null, but it might not be too,
// but it will be of nullable int type.
if (value == null) return defaultValue;
// If it was not null, but was less than zero, that we use to represent
// stored null, we will return null of type T.
if (value < 0) return null as T;
// else we return the value.
return value as T;
}
// T is integer none nullable value.
if (sameTypes<T, int>()) {
// For a non nullable, we can just use the defaultValue as fallback if
// a key did not exist.
final int value = _prefs.getInt(key) ?? defaultValue as int;
if (_debug) {
debugPrint('SharedPrefs loaded type int : $key as $value');
}
// else we return the value.
return value as T;
}
// T is double nullable value.
if (sameTypes<T, double?>()) {
final double? value = _prefs.getDouble(key) ?? defaultValue as double?;
if (_debug) {
debugPrint('SharedPrefs loaded type double? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0.0) return null as T;
return value as T;
}
// T is double none nullable value.
if (sameTypes<T, double>()) {
final double value = _prefs.getDouble(key) ?? defaultValue as double;
if (_debug) {
debugPrint('SharedPrefs loaded type double : $key as $value');
}
return value as T;
}
// T is String nullable value.
if (sameTypes<T, String?>()) {
final String? value = _prefs.getString(key) ?? defaultValue as String?;
if (_debug) {
debugPrint('SharedPrefs loaded type String? : $key as $value');
}
if (value == null) return defaultValue;
if (value == '<NULL>') return null as T;
return value as T;
}
// T is String none nullable value.
if (sameTypes<T, String>()) {
final String value = _prefs.getString(key) ?? defaultValue as String;
if (_debug) {
debugPrint('SharedPrefs loaded type String : $key as $value');
}
return value as T;
}
// T is Color nullable value.
if (sameTypes<T, Color?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded Color? : $key as $value');
}
// If value is null, we had no key for it, we should return the
// default value, that may also be null, but it might not be too,
// but it will be of nullable Color type.
if (value == null) return defaultValue;
// Return negative out of bounds Color value as null as T;
if (value < 0x00000000) return null as T;
// Return positive out of bounds Color value as default value;
if (value > 0xFFFFFFFF) return defaultValue;
// else we return the value as a Color of type T.
return Color(value) as T;
}
// T is Color none nullable value.
if (sameTypes<T, Color>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded Color : $key as $value');
}
// If value is null, we had no key for it, we should return the
// default value, that is a none nullable Color.
if (value == null) return defaultValue;
// Return negative out of bounds Color value as null as T;
if (value < 0x00000000) return null as T;
// Return positive out of bounds Color value as default value;
if (value > 0xFFFFFFFF) return defaultValue;
// else we return the value as a Color of type T.
return Color(value) as T;
}
// We have to explicitly handle each Enum type we have stored to be able
// to convert it back to its type, which we have in its type parameter.
//
// T is ThemeMode nullable value.
if (sameTypes<T, ThemeMode?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded ThemeMode? : $key as $value');
}
// If value is null, we had no key for it, we should return the
// default value, that may also be null, but it might not be too,
// but it will be of nullable ThemeMode type.
if (value == null) return defaultValue;
// Return negative out of Enum bounds value as null;
if (value < 0) return null as T;
// Return positive out of bounds index value as default value;
if (value >= ThemeMode.values.length) return defaultValue;
// else we return the value as a ThemeMode of type T.
return ThemeMode.values[value] as T;
}
// T is ThemeMode none nullable value.
if (sameTypes<T, ThemeMode>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded ThemeMode : $key as $value');
}
// If value is null, we had no key for it, we should return the
// default value, that may also be null, but it might not be too,
// but it will be of nullable ThemeMode type.
if (value == null) return defaultValue;
// Return negative out of Enum bounds value as default value;
if (value < 0) return defaultValue;
// Return positive out of bounds index value as default value;
if (value >= ThemeMode.values.length) return defaultValue;
// else we return the value as a ThemeMode of type T.
return ThemeMode.values[value] as T;
}
//
// The rest of the supported Enum types are a repeat of the above pattern.
//
// T is FlexScheme nullable value.
if (sameTypes<T, FlexScheme?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexScheme? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexScheme.values.length) return defaultValue;
return FlexScheme.values[value] as T;
}
// T is FlexScheme none nullable value.
if (sameTypes<T, FlexScheme>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexScheme : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexScheme.values.length) return defaultValue;
return FlexScheme.values[value] as T;
}
// T is FlexSurfaceMode nullable value.
if (sameTypes<T, FlexSurfaceMode?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexSurfaceMode? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexSurfaceMode.values.length) return defaultValue;
return FlexSurfaceMode.values[value] as T;
}
// T is FlexSurfaceMode none nullable value.
if (sameTypes<T, FlexSurfaceMode>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexSurfaceMode : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexSurfaceMode.values.length) return defaultValue;
return FlexSurfaceMode.values[value] as T;
}
// T is FlexInputBorderType nullable value.
if (sameTypes<T, FlexInputBorderType?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded FlexInputBorderType? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexInputBorderType.values.length) return defaultValue;
return FlexInputBorderType.values[value] as T;
}
// T is FlexInputBorderType none nullable value.
if (sameTypes<T, FlexInputBorderType>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded FlexInputBorderType : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexInputBorderType.values.length) return defaultValue;
return FlexInputBorderType.values[value] as T;
}
// T is FlexAppBarStyle nullable value.
if (sameTypes<T, FlexAppBarStyle?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexAppBarStyle? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexAppBarStyle.values.length) return defaultValue;
return FlexAppBarStyle.values[value] as T;
}
// T is FlexAppBarStyle none nullable value.
if (sameTypes<T, FlexAppBarStyle>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexAppBarStyle : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexAppBarStyle.values.length) return defaultValue;
return FlexAppBarStyle.values[value] as T;
}
// T is FlexTabBarStyle nullable value.
if (sameTypes<T, FlexTabBarStyle?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexTabBarStyle? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexTabBarStyle.values.length) return defaultValue;
return FlexTabBarStyle.values[value] as T;
}
// T is FlexTabBarStyle none nullable value.
if (sameTypes<T, FlexTabBarStyle>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexTabBarStyle : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexTabBarStyle.values.length) return defaultValue;
return FlexTabBarStyle.values[value] as T;
}
// T is FlexSystemNavBarStyle nullable value.
if (sameTypes<T, FlexSystemNavBarStyle?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded FlexSystemNavBarStyle? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexSystemNavBarStyle.values.length) return defaultValue;
return FlexSystemNavBarStyle.values[value] as T;
}
// T is FlexSystemNavBarStyle none nullable value.
if (sameTypes<T, FlexSystemNavBarStyle>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded FlexSystemNavBarStyle : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexSystemNavBarStyle.values.length) return defaultValue;
return FlexSystemNavBarStyle.values[value] as T;
}
// T is SchemeColor nullable value.
if (sameTypes<T, SchemeColor?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded SchemeColor? : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= SchemeColor.values.length) return defaultValue;
return SchemeColor.values[value] as T;
}
// T is SchemeColor none nullable value.
if (sameTypes<T, SchemeColor>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded SchemeColor : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= SchemeColor.values.length) return defaultValue;
return SchemeColor.values[value] as T;
}
// T is NavigationDestinationLabelBehavior nullable value.
if (sameTypes<T, NavigationDestinationLabelBehavior?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded NavigationDestinationLabelBehavior? '
': $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= NavigationDestinationLabelBehavior.values.length) {
return defaultValue;
}
return NavigationDestinationLabelBehavior.values[value] as T;
}
// T is NavigationDestinationLabelBehavior none nullable value.
if (sameTypes<T, NavigationDestinationLabelBehavior>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded NavigationDestinationLabelBehavior '
': $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= NavigationDestinationLabelBehavior.values.length) {
return defaultValue;
}
return NavigationDestinationLabelBehavior.values[value] as T;
}
// T is NavigationRailLabelType nullable value.
if (sameTypes<T, NavigationRailLabelType?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded NavigationRailLabelType?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= NavigationRailLabelType.values.length) return defaultValue;
return NavigationRailLabelType.values[value] as T;
}
// T is NavigationRailLabelType none nullable value.
if (sameTypes<T, NavigationRailLabelType>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded NavigationRailLabelType : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= NavigationRailLabelType.values.length) return defaultValue;
return NavigationRailLabelType.values[value] as T;
}
// T is FlexSliderIndicatorType nullable value.
if (sameTypes<T, FlexSliderIndicatorType?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded FlexSliderIndicatorType?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexSliderIndicatorType.values.length) return defaultValue;
return FlexSliderIndicatorType.values[value] as T;
}
// T is FlexSliderIndicatorType none nullable value.
if (sameTypes<T, FlexSliderIndicatorType>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint(
'SharedPrefs loaded FlexSliderIndicatorType : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexSliderIndicatorType.values.length) return defaultValue;
return FlexSliderIndicatorType.values[value] as T;
}
// T is ShowValueIndicator nullable value.
if (sameTypes<T, ShowValueIndicator?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded ShowValueIndicator?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= ShowValueIndicator.values.length) return defaultValue;
return ShowValueIndicator.values[value] as T;
}
// T is ShowValueIndicator none nullable value.
if (sameTypes<T, ShowValueIndicator>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded ShowValueIndicator : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= ShowValueIndicator.values.length) return defaultValue;
return ShowValueIndicator.values[value] as T;
}
// T is TabBarIndicatorSize nullable value.
if (sameTypes<T, TabBarIndicatorSize?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded TabBarIndicatorSize?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= TabBarIndicatorSize.values.length) return defaultValue;
return TabBarIndicatorSize.values[value] as T;
}
// T is TabBarIndicatorSize none nullable value.
if (sameTypes<T, TabBarIndicatorSize>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded TabBarIndicatorSize : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= TabBarIndicatorSize.values.length) return defaultValue;
return TabBarIndicatorSize.values[value] as T;
}
// T is AdaptiveTheme is nullable value.
if (sameTypes<T, AdaptiveTheme?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded AdaptiveTheme?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= AdaptiveTheme.values.length) return defaultValue;
return AdaptiveTheme.values[value] as T;
}
// T is AdaptiveTheme none nullable value.
if (sameTypes<T, AdaptiveTheme>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded AdaptiveTheme : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= AdaptiveTheme.values.length) return defaultValue;
return AdaptiveTheme.values[value] as T;
}
// T is FlexPaletteType is nullable value.
if (sameTypes<T, FlexPaletteType?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexPaletteType?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= FlexPaletteType.values.length) return defaultValue;
return FlexPaletteType.values[value] as T;
}
// T is FlexPaletteType none nullable value.
if (sameTypes<T, FlexPaletteType>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded FlexPaletteType : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= FlexPaletteType.values.length) return defaultValue;
return FlexPaletteType.values[value] as T;
}
// T is VisualDensityEnum is nullable value.
if (sameTypes<T, VisualDensityEnum?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded VisualDensityEnum?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= VisualDensityEnum.values.length) return defaultValue;
return VisualDensityEnum.values[value] as T;
}
// T is VisualDensityEnum none nullable value.
if (sameTypes<T, VisualDensityEnum>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded VisualDensityEnum : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= VisualDensityEnum.values.length) return defaultValue;
return VisualDensityEnum.values[value] as T;
}
// T is SplashTypeEnum is nullable value.
if (sameTypes<T, SplashTypeEnum?>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded SplashTypeEnum?: $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return null as T;
if (value >= SplashTypeEnum.values.length) return defaultValue;
return SplashTypeEnum.values[value] as T;
}
// T is SplashTypeEnum none nullable value.
if (sameTypes<T, SplashTypeEnum>()) {
final int? value = _prefs.getInt(key);
if (_debug) {
debugPrint('SharedPrefs loaded SplashTypeEnum : $key as $value');
}
if (value == null) return defaultValue;
if (value < 0) return defaultValue;
if (value >= SplashTypeEnum.values.length) return defaultValue;
return SplashTypeEnum.values[value] as T;
}
} catch (e) {
debugPrint('SharedPrefs load ERROR');
debugPrint(' Error message ...... : $e');
debugPrint(' Store key .......... : $key');
debugPrint(' defaultValue ....... : $defaultValue');
// If something goes wrong we return the default value.
return defaultValue;
}
// If we did not have a type converter, we return the default value.
return defaultValue;
}