The system-reported text scale.
Accessing this value returns the value contained in the
PlatformDispatcher singleton, so instead of getting it from here, you
should consider getting it from
WidgetsBinding isn't available, from
PlatformDispatcher.instance). The reason this value forwards to the
PlatformDispatcher is to provide convenience for applications that only
use a single main window.
This establishes the text scaling factor to use when rendering text, according to the user's platform preferences.
The onTextScaleFactorChanged callback is called whenever this value changes.
- WidgetsBindingObserver, for a mechanism at the widgets layer to observe when this value changes.
double get textScaleFactor => platformDispatcher.textScaleFactor;