debugCheckHasFlyout function

bool debugCheckHasFlyout(BuildContext context)

Asserts that the given context has a Flyout ancestor.

To call this function, use the following pattern, typically in the relevant Widget's build method:

assert(debugCheckHasFlyout(context));

Does nothing if asserts are disabled. Always returns true.

Implementation

bool debugCheckHasFlyout(BuildContext context) {
  assert(() {
    if (Flyout.maybeOf(context) == null) {
      throw FlutterError.fromParts(<DiagnosticsNode>[
        ErrorSummary('No Flyout found.'),
        ErrorDescription(
          '${context.widget.runtimeType} widgets require a Flyout '
          'to be provided by a Flyout widget ancestor.',
        ),
        ErrorHint(
          'To introduce a Flyout, use the showFlyout method or related methods.',
        ),
        ...context.describeMissingAncestor(expectedAncestorType: Flyout),
      ]);
    }
    return true;
  }());
  return true;
}