# onTextScaleFactorChanged property

VoidCallback onTextScaleFactorChanged

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.

## Implementation

    VoidCallback get onTextScaleFactorChanged => _onTextScaleFactorChanged;

void onTextScaleFactorChanged= (VoidCallback callback)

## Implementation

    set onTextScaleFactorChanged(VoidCallback callback) {
      _onTextScaleFactorChanged = callback;
      _onTextScaleFactorChangedZone = Zone.current;
    }