maybeBrightnessOf 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, it will fall
back to MediaQueryData.platformBrightness.
Returns null if no valid CupertinoTheme or MediaQuery widgets exist in the ancestry tree.
See also:
- CupertinoThemeData.brightness, the property takes precedence over MediaQueryData.platformBrightness for descendant Cupertino widgets.
- brightnessOf, which throws if no valid CupertinoTheme or MediaQuery exists, instead of returning null.
Implementation
static Brightness? maybeBrightnessOf(BuildContext context) {
final _InheritedCupertinoTheme? inheritedTheme = context.dependOnInheritedWidgetOfExactType<_InheritedCupertinoTheme>();
return inheritedTheme?.theme.data.brightness ?? MediaQuery.maybeOf(context)?.platformBrightness;
}