wFull method
Implementation
AzButton wFull(){
ui.PlatformDispatcher platformDispatcher = WidgetsBinding.instance.platformDispatcher;
ui.FlutterView flutterView = platformDispatcher.views.first;
// Access the physical size of the screen
Size screenSize = flutterView.physicalSize / flutterView.devicePixelRatio;
double width = screenSize.width;
_width = width;
_fixedSize = MaterialStateProperty.all(Size(width, _height));
return this;
}