onSystemFontFamilyChanged property Null safety
A callback that is invoked whenever systemFontFamily changes value.
The framework invokes this callback in the same zone in which the callback was set.
See also:
- WidgetsBindingObserver, for a mechanism at the widgets layer to observe when this callback is invoked.
Implementation
VoidCallback? get onSystemFontFamilyChanged => _onSystemFontFamilyChanged;Implementation
set onSystemFontFamilyChanged(VoidCallback? callback) {
_onSystemFontFamilyChanged = callback;
_onSystemFontFamilyChangedZone = Zone.current;
}