build method
Subclasses should override this function to actually call the appropriate
build
function (e.g., StatelessWidget.build or State.build) for
their widget.
Implementation
@override
Widget build() {
Widget? built;
reaction.track(() {
built = super.build();
});
if (enableWarnWhenNoObservables &&
(_widget.warnWhenNoObservables ?? true) &&
!reaction.hasObservables) {
_widget.log(
'No observables detected in the build method of ${reaction.name}',
);
}
// This "throw" is better than a "LateInitializationError"
// which confused the user. Please see #780 for details.
if (built == null) {
throw Exception(
'Error happened when building ${_widget.runtimeType}, but it was captured since disableErrorBoundaries==true');
}
return built!;
}