checked property

bool checked

If non-null, sets the SemanticsNode.hasCheckedState semantic to true and the SemanticsNode.isChecked semantic to the given value.

Implementation 

bool get checked => _checked;
void checked= (bool value)

Implementation 

set checked(bool value) {
  if (checked == value)
    return;
  _checked = value;
  markNeedsSemanticsUpdate();
}