A callback that is invoked whenever textScaleFactor 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.
Source
VoidCallback get onTextScaleFactorChanged => _onTextScaleFactorChanged;
Source
set onTextScaleFactorChanged(VoidCallback callback) { _onTextScaleFactorChanged = callback; _onTextScaleFactorChangedZone = Zone.current; }