checkDark method
check current theme is dark or not.
if themeMode is ThemeMode.system check current ThemeMode of system
.
Implementation
bool checkDark() {
if (_mediaContext == null) return false;
final Brightness systemBrightnessValue =
MediaQuery.of(_mediaContext!).platformBrightness;
return _mode == ThemeMode.system
? systemBrightnessValue == Brightness.dark
: _mode == ThemeMode.dark;
}