brightnessOf method Null safety
- BuildContext context
Retrieves the Brightness to use for descendant Cupertino widgets, based
on the value of CupertinoThemeData.brightness in the given context.
If no CupertinoTheme can be found in the given context, or its brightness
is null, it will fall back to MediaQueryData.platformBrightness.
Throws an exception if no valid CupertinoTheme or MediaQuery widgets exist in the ancestry tree.
See also:
- maybeBrightnessOf, which returns null if no valid CupertinoTheme or MediaQuery exists, instead of throwing.
- CupertinoThemeData.brightness, the property takes precedence over MediaQueryData.platformBrightness for descendant Cupertino widgets.
Implementation
static Brightness brightnessOf(BuildContext context) {
final _InheritedCupertinoTheme? inheritedTheme = context.dependOnInheritedWidgetOfExactType<_InheritedCupertinoTheme>();
return inheritedTheme?.theme.data.brightness ?? MediaQuery.of(context).platformBrightness;
}