theme property
Styling for this widget alone.
Takes precedence over any T an ancestor ComponentTheme provides: when
this is non-null the ancestor is not consulted at all, so a field left
null here falls back to the component's built-in default rather than to
the ancestor's value. To adjust an ancestor theme instead of replacing it,
read it with ComponentTheme.maybeOf and copyWith the result.
Prefer this over the per-property constructor arguments, which are deprecated.
Implementation
@override
final MultipleChoiceTheme? theme;