scrollToFirstInvalidField function

void scrollToFirstInvalidField(BuildContext formContext)

Scrolls to the first invalid FormField in the subtree rooted at formContext. Must be called after Form.validate so that FormFieldState.hasError is up to date.

Implementation

void scrollToFirstInvalidField(BuildContext formContext) {
  WidgetsBinding.instance.addPostFrameCallback((_) {
    bool found = false;
    void visitor(Element element) {
      if (found) return;
      if (element is StatefulElement && element.state is FormFieldState) {
        if ((element.state as FormFieldState).hasError) {
          found = true;
          Scrollable.ensureVisible(
            element,
            duration: const Duration(milliseconds: 300),
            curve: Curves.easeInOut,
            alignment: 0.1,
          );
          return;
        }
      }
      element.visitChildren(visitor);
    }
    (formContext as Element).visitChildren(visitor);
  });
}